Automatic high-speed rotary atomizing device and a fire extinguishing method by using the same

Abstract

An automatic high-speed rotary atomizing device, comprising a rotary spray head with an upper portion and a lower portion, the upper portion is connected to pressurized fluid, the lower portion is connected to the upper portion by means of one or more spray nozzles (1, 3) or spray orifices via a bearing (56). The upper portion is stationary. When the pressurized fluid is sprayed out from the spray nozzle, part of kinetic energy of the pressurized fluid generates a counterforce that propels the entire lower portion of the spray head to rotate at a high speed, so as to convert most of the kinetic energy of the pressurized fluid into surface energy that facilitates atomization of water flow when the pressurized fluid hits against a slanted surface or slit of the spray nozzle or passes through an aperture thereof, thereby forming a large-scale atomized, dispersed and swirling system. This automatic high-speed rotary atomizing device has low working pressure, high rotating speed, small and homogeneous fog droplets, and therefore can be widely used in fire extinguishing, flue gas purification, city purification, greenfield watering, landscape decoration, etc.

Claims

1. An automatic high-speed rotary atomizing device, comprising a rotary spray head, characterized in that, the rotary spray head comprises: an upper portion that is connected to pressurized fluid and is stationary; and a lower portion that is provided with one or more spray nozzles and is connected to the upper portion via a bearing, wherein, at least one spray nozzle of the one or more spray nozzles has a slanted surface with a curvature at an output end of the at least one spray nozzle and has a straight fluid transport channel body with a constant channel cross-sectional area and an axis that perpendicularly intersects the rotation axis of the lower portion of the rotary spray head at an input end of the at least one spray nozzle, and when the pressurized fluid is sprayed out from the output end of the at least one spray nozzle, part of the kinetic energy of the pressurized fluid generates a counterforce that propels the entire lower portion of the spray head to rotate at a high speed, and when the pressurized fluid is guided by the at least one spray nozzle, most of the kinetic energy of the pressurized fluid is converted into kinetic energy of the rotating spray nozzle and surface energy that facilitates atomization of the pressurized fluid, thereby forming high speed rotation of the spray nozzle and a large-scale atomized, dispersed and swirling system.

2. The automatic high-speed rotary atomizing device in accordance with claim 1, characterized in that, the rotary spray head comprises a spray nozzle, a rotary head, a bearing, a pipe joint, a fastener and a locating piece connected in sequence, the spray nozzle is fixed to the rotary head, the rotary head is connected to the bearing and the spray nozzle, the bearing is connected to the pipe joint, and the locating piece is arranged to locate the bearing in both the axial direction and the radial direction; the spray nozzle and the rotary head are disposed on the lower portion, and the pipe joint is disposed on the upper portion.

3. The automatic high-speed rotary atomizing device in accordance with claim 2, characterized in that, the rotary spray head is connected to a fan blade or an impeller blade or a paddle blade.

4. The automatic high-speed rotary atomizing device in accordance with claim 3, characterized in that, the fan blade or impeller blade or paddle blade is provided with micro apertures.

5. The automatic high-speed rotary atomizing device in accordance with claim 2, characterized in that, the rotary head is in threaded or welded connection with the bearing and the spray nozzle; the rotary head is provided with a flow passage bore therein and one or more openings or screw holes for being connected to the spray nozzle; the bearing consists of one or more deep groove ball bearings, or the bearing consists of one or more deep groove ball bearings and axial thrust bearings.

6. The automatic high-speed rotary atomizing device in accordance with claim 5, characterized in that, the rotary spray head has a bullet shape, an olive shape, a round shape, a rectangular shape, a long column shape or a transverse tubular shape; the spray nozzle consists of one or more nozzles for providing rotation, or consists of one or more nozzles for providing rotation and one or more top nozzles.

7. The automatic high-speed rotary atomizing device in accordance with claim 6, characterized in that, the sum of aperture the channel cross-sectional areas of the straight fluid transport channel bodies of the spray nozzles does not exceed the cross-sectional area of the flow passage bore within the rotary head.

8. The automatic high-speed rotary atomizing device in accordance with claim 6, characterized in that, the spray nozzle is a fine-pored spray nozzle, an atomizing nozzle, a small-flow jet nozzle or combination thereof.

9. The automatic high-speed rotary atomizing device in accordance with claim 1, characterized in that, the rotary spray head is a three-nozzle jet flow rotary spray head.

10. The automatic high-speed rotary atomizing device in accordance with claim 9, characterized in that, the three-nozzle jet flow rotary spray head is a three-nozzle jet flow double-needle atomizing spray head.

11. The automatic high-speed rotary atomizing device in accordance with claim 10, characterized in that, when the fluid is ejected from spray nozzles on both lateral sides of the three-nozzle jet flow double-needle atomizing spray head, the ejection direction of the fluid forms an intersection angle of 45 or 90 with the fluid transport channel axis of either of the spray nozzles on both lateral sides.

12. The automatic high-speed rotary atomizing device in accordance with claim 9, characterized in that, when the fluid is ejected from spray nozzles on both lateral sides of the three-nozzle jet flow rotary spray head, the ejection direction of the fluid forms an intersection angle of 45 or 90 with the fluid transport channel axis of either of the spray nozzles on both lateral sides.

13. Use of the automatic high-speed rotary atomizing device in accordance with claim 1, wherein, the rotary spray head is applied in a kettle, a tower or a tank individually or in combination, or the rotary spray head is connected on a pressurized fluid delivery pipe or a pressurized gas-water mixer, or the rotary spray head is positioned within a gas phase and/or a liquid phase.

14. The use of the automatic high-speed rotary atomizing device in accordance with claim 13, characterized in that, the automatic high-speed rotary atomizing device is positioned in a swirling purification tower, with the rotary spray head arranged adjacent to the flue gas inlet at the tower bottom for upward spraying or arranged at the middle section of the swirling purification tower.

15. The use of the automatic high-speed rotary atomizing device in accordance with claim 13, characterized in that, the rotary spray head is connected to a pump, a pressurized water storage container or pipeline to form a cooling humidification de-dusting apparatus, so as to perform local artificial intervention on the atmosphere to carry out atmospheric purification or artificial raining, to alleviate haze, and to eliminate smoke, dust and PM2.5 in a room, a yard, a residential district or a street.

16. A fire extinguishing method by using the automatic high-speed rotary atomizing device in accordance with claim 1, wherein, the rotary spray head is connected on an indoor stationary automatic water-spray fire extinguishing system, a mobile fire-fighting lance outlet, a portable fire extinguisher, a running water pipe web, a water pump, a pressurized gas-water mixing container, or a pressurized fluid delivery pipe.

17. The fire extinguishing method in accordance with claim 16, characterized in that, the rotary spray head is a three-nozzle jet flow rotary spray head, a three-nozzle jet flow double-needle atomizing spray head, a three-nozzle jet flow 45-nozzle-angle double-needle atomizing spray head, or a bullet-shaped multi-nozzle jet flow rotary spray head.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to make the subject matter of the present invention easy and clear to understand, hereinafter, the present invention will be further described in detail according to specific embodiments of the present invention and with reference to the appended drawings, wherein:

(2) FIG. 1 shows a preferable structure of a three-nozzle jet flow 90-nozzle-angle rotary spray head with a single bearing;

(3) FIG. 2 shows a preferable structure of a three-nozzle jet flow 45-nozzle-angle rotary spray head with a single bearing;

(4) FIG. 3 shows a preferable structure of a three-nozzle jet flow double-needle atomizing spray head with a single bearing;

(5) FIG. 4 shows a preferable structure of a spiral atomizing rotary spray head with a single bearing;

(6) FIG. 5 shows a preferable structure of three-nozzle jet flow single-needle atomizing spray head;

(7) FIG. 6 shows a preferable structure of a three-nozzle jet flow rotary spray head with two bearings;

(8) FIG. 7 shows a preferable structure of a three-nozzle jet flow rotary spray head with three bearings;

(9) FIG. 8 shows a preferable structure of a three-nozzle jet flow rotary spray head with fan blades;

(10) FIG. 9 shows another preferable structure of a three-nozzle jet flow rotary spray head with fan blades;

(11) FIG. 10 shows a preferable structure of a bullet-shaped rotary spray head;

(12) FIG. 11 shows a preferable structure of a single-arm single-nozzle rotary spray head;

(13) FIG. 12 shows a preferable structure of a single-arm double-nozzle rotary spray head;

(14) FIG. 13 shows a preferable structure of a single-arm double-nozzle single-spiral rotary spray head;

(15) FIG. 14 shows a preferable structure of a double-layer multi-nozzle rotary spray head;

(16) FIG. 15 shows a preferable structure of a four-nozzle rotary spray head;

(17) FIG. 16 shows flow rate under different pressure of the three-nozzle jet flow rotary spray head;

(18) FIG. 17 shows radial distribution of sprayed water amount of the three-nozzle jet flow rotary spray head when spraying upwards and downwards under 3-kilogram pressure;

(19) FIG. 18 shows radial distribution of sprayed water amount of the three-nozzle jet flow 45-nozzle-angle rotary spray head when spraying upwards and downwards under 3-kilogram pressure;

(20) FIG. 19 shows radial distribution of sprayed water amount of the three-nozzle double-needle jet flow 90-nozzle-angle rotary spray head when spraying upwards and downwards under 3-kilogram pressure;

(21) FIG. 20 shows radial distribution of sprayed water amount of the single-spiral composite spray head when spraying upwards and downwards under 3-kilogram pressure;

(22) FIG. 21 is a schematic diagram of positions of wind speed testing points;

(23) FIG. 22-1 shows a structure of a watering spray head in prior art;

(24) FIG. 22-2 shows a structure of a water fog spray head in prior art;

(25) FIG. 22-3 shows a single-nozzle spiral spray head in prior art;

(26) FIG. 22-4 shows a three-nozzle spiral spray head in prior art;

(27) FIG. 23 shows distribution of sprayed water amount in the radial direction and in the 45 direction of various rotary spray heads when spraying horizontally under 3-kilogram pressure;

(28) FIG. 24 shows radial distribution of sprayed water amount of the spray heads in prior art when spraying downwards under 3-kilogram pressure;

(29) FIG. 25 shows temperature change before and after extinguishing a type-A fire with a hand-held bullet-shaped rotary spray head.

(30) Wherein, the reference numerals in the drawing are explained as follows: 1fan-shaped spray nozzle, 2rotary head, 3wide-angle fan-shaped spray nozzle, 4clamp spring, 5deep groove ball bearing, 6thrust bearing, 56bearing, 7distance sleeve for bearing, 8bearing seat, 9screw bolt, 10lock nut, 11sealing sleeve, 12connecting nut for pipe joint, 13fan blade, 14pipe joint, 15bearing jacket, 100fringe point, 200half center point, 300center point.

DETAILED DESCRIPTION OF EMBODIMENTS

(31) The present invention can be further understood by reading the following embodiments of the present invention. The following embodiments are merely several specific embodiments of the present invention, and the scope of the present invention is not limited to these embodiments. Implementation of the present invention by using its method or technical solution with unessential modification should be considered to constitute infringement of the protection scope of the present invention. In the following embodiments, the spray heads are all rotary spray heads with a design parameter of 3 m/h flow rate under 0.3 Mpa (3-kilogram) pressure, wherein the wide-angle fan-shaped spray nozzle has a spray angle of 75, the fan-shaped spray nozzle has a spray angle of 60, and the nozzles have a main flow passage with a diameter of 2 mm.

I. Test of Rotating Speed and Flow Rate of the Rotary Spray Heads Under Different Pressure

Embodiment 1: Flow Rate of the Three-Nozzle Jet Flow Rotary Spray Heads Under Different Pressure

(32) A three-nozzle jet flow rotary spray head is mounted onto an experiment apparatus with a pressure gauge and a water pump, and tap water is used for experiments, with the nozzle mouth water pressure being 0.05 MPa, 0.10 MPa, 0.15 MPa, 0.20 MPa, 0.25 MPa, 0.30 MPa, and 0.35 MPa. The sprayed water is collected by a water tank and weighed by a weighing machine. The water spraying time for each time is 2 min, and flow rate of the spray head under different pressure is measured, as shown in FIG. 16.

(33) The test results indicate that: there is a good linear relationship between the flow rate of the spray head and the pressure, so the flow rate can be adjusted according to requirements.

Embodiment 2: Rotating Speed of Different Spray Heads Under 3-Kilogram Pressure

(34) Different rotary spray heads are respectively mounted onto the experiment apparatus, and clean water is used for experiments. The rotating speed of different spray heads is measured under the same 3-kilogram water pressure. As shown in Table 1, the test results indicate that, under the same 3-kilogram water pressure, the various types of spray heads all have rotating speeds higher than 2000r/min, wherein the spiral atomizing rotary spray head has a lowest rotating speed of 2018r/min, and the three-nozzle jet flow rotary spray head has a highest rotating speed of 7991 r/min, while the three-nozzle jet flow double-needle atomizing spray head has the best stability.

(35) TABLE-US-00001 TABLE 1 Rotating speed of different spray heads under 3-kilogram pressure three-nozzle three-nozzle three-nozzle jet flow 45- jet flow spiral jet flow nozzle-angle double-needle atomizing Rotating rotary rotary atomizing rotary speed/r/min spray head spray head spray head spray head maximum 7991 5398 7765 3637 minimum 4780 2159 3114 2018 real-time 5531 4223 5342 2247

Embodiment 3: Rotating Speed in Air Medium of Different Spray Heads Fed with Air

(36) Air is fed into the spray heads, and the rotating speed of different spray heads is measured under different pressures in air medium. As shown in Table 2, the three-nozzle jet flow double-needle atomizing spray head has relatively higher rotating speed under 0.5-kilogram pressure, with a highest rotating speed of 11132 r/min; the spiral atomizing rotary spray head has relatively lower rotating speed under the same pressure.

(37) TABLE-US-00002 TABLE 2 Rotating speed in air medium of different spray heads fed with air three- three-nozzle three-nozzle nozzle jet flow jet flow spiral jet flow 45-nozzle- double-needle atomizing Rotating rotary angle rotary atomizing rotary speed/r/min spray head spray head spray head spray head 0.5 kg maximum 8231 7171 7967 5340 minimum 11000 8363 11132 7707 1 kg maximum 11364 11069 5579 4334 minimum 14409 11113 9902 8013

II. Test of Water Amount Distribution, Spray Radius and Farthest Spray Distance of the Spray Heads Under Different Conditions

Embodiment 4: Radial Distribution of Sprayed Water Amount of Different Spray Heads when Spraying Upwards and Downwards

(38) The water amount distribution of the spray heads when spraying upwards and downwards is tested as follows: the spray head is positioned at a 2.5 m height above the ground, a row of water collecting tanks (S=0.08 m.sup.2) are placed along the radial direction starting from a central point directly under the spray head, and after the spray head is kept on for 3 min under 3-kilogram pressure, the mass or volume of water collected in each water collecting tank at different distances from the spray head at the center (i.e. at different radial distances) is measured, so as to obtain test results of flow rate radial distribution conditions such as spray density, effective spray radius, and farthest spray distance, as shown in FIGS. 17-20.

(39) When spraying horizontally, the spray head is positioned at a 1 m height above the ground, a row of water collecting tanks (the size of each water collecting tank being S=0.08 m.sup.2) are placed along a radial direction in due front of the spray head (due front), another row of water collecting tanks are placed along a radial direction that deviates form due front by a 45 angle) (45, the spray head is kept on for 3 min under 3-kilogram pressure, and then the mass or volume of water collected in each water collecting tank is measured, so as to calculate the spray density at each water collecting tank. The test results thereof are shown in FIG. 23.

(40) As shown in FIG. 17, the test results indicate that: the fog droplets sprayed by the three-nozzle jet flow 90-nozzle-angle rotary spray head are mainly distributed within an area having a diameter of 2 m when spaying downwards, and the sprayed fog droplets can be distributed better within an area having a diameter of over 5 m when spaying upwards. Fire-extinguishing by spaying upwards can cover a larger range, with the maximum spray density at a diameter of about 3 m. Apparently, upward spraying can make the atomized water cover a larger range.

(41) As shown in FIG. 18, the test results indicate that: the fog droplets sprayed by the three-nozzle jet flow 45-nozzle-angle rotary spray head are also mainly distributed within an area having a diameter of 2 m when spaying downwards, and the sprayed fog droplets can be distributed wider within an area having a diameter of about 4 m when spaying upwards. Apparently, for the three-nozzle jet flow 45-nozzle-angle rotary spray head, upward spraying can cover a much larger range than downward spraying, with more uniform distribution.

(42) As shown in FIG. 19, the test results indicate that: the dispersion characteristic of upwardly or downwardly sprayed fog droplets can be improved by using the three-nozzle double-needle jet flow 90-nozzle-angle rotary spray head, wherein the fog droplets can reach an area having a diameter of about 5 m. The spray density within an area having a diameter of 5 m can be significantly increased when spaying upwards, and the maximum spray density appears at a diameter of about 2 m.

(43) As shown in FIG. 20, the test results indicate that: the single-spiral composite spray head also has good dispersion characteristic of upwardly or downwardly sprayed fog droplets, wherein the fog droplets can reach an area having a diameter of about 3 m. The spray density within an area having a diameter of about 4 m can be significantly increased when spaying upwards, with uniform distribution in an area having a diameter of about 3 m.

(44) As shown in FIG. 23, when spraying horizontally, the three-nozzle jet flow 90-nozzle-angle rotary spray head has a maximum spray density at a distance of 4 m in the due front direction and has a maximum spray density at a distance of 2 m in the 45 direction, this spray head has an effective fire-extinguishing distance (spray density being over 1) of 6 m in the due front direction and has an effective fire-extinguishing distance of 3 m in the 45 direction. When spraying horizontally, the three-nozzle jet flow 45-nozzle-angle rotary spray head has a maximum spray density at a distance of 1.5 m and another maximum spray density at a distance of 4.5 m in the due front direction, and its spray density decreases as the distance from the spray head gets farther in the 45 direction, thus it can be concluded that the spray is more concentrated towards the due front central direction with a 45 nozzle angle, this spray head has an effective fire-extinguishing distance (spray density being over 1) of 6.5 m in the due front direction and has an effective fire-extinguishing distance of 3.2 m in the 45 direction. When spraying horizontally, the three-nozzle jet flow double-needle 90-nozzle-angle atomizing rotary spray head has a maximum spray density at a distance of 3.5 m in the due front direction, and its spray density decreases as the distance from the spray head gets farther in the 45 direction, this spray head has an effective fire-extinguishing distance (spray density being over 1) of 6 m in the due front direction and has an effective fire-extinguishing distance of 3.5 m in the 45 direction. If the two spray nozzles at both lateral sides of the three-nozzle jet flow double-needle atomizing rotary spray head have a 45 nozzle angle, such a spray head has maximum spray densities at a distance of 1.5 m and at a distance of 4.5 m in the due front direction, and its spray density decreases as the distance from the spray head gets farther in the 45 direction and in the horizontal direction, which is similar to the water distribution condition of the three-nozzle jet flow 45-nozzle-angle rotary spray head, and this spray head has an effective fire-extinguishing distance (spray density being over 1) of 6 m in the due front direction, has an effective fire-extinguishing distance of 3.7 m in the 45 direction, and has an effective fire-extinguishing distance of 2 m in the horizontal direction. Wherein, if the two lateral spray nozzles have a 45 nozzle angle, the spray at both lateral sides is more concentrated and fills the gap between each lateral spray nozzle and the central nozzle, with more uniform water amount distribution. When spraying horizontally, the single-spiral composite rotary spray head has a maximum spray density at a distance of 4 m-5 m in the due front direction and has a maximum spray density at a distance of 2 m (excluding the first testing point) in the 45 direction, this spray head has an effective fire-extinguishing distance (spray density being over 1) of 6 m in the due front direction and has an effective fire-extinguishing distance of 2.8 m in the 45 direction. The bullet-shaped rotary spray head has relatively large sprayed water amount, and when spraying horizontally, this spray head has a maximum spray density at a distance of 2 m-3 m in the due front direction, and its spray density decreases as the distance from the spray head gets farther in the 45 direction, this spray head has an effective fire-extinguishing distance (spray density being over 1) over 5 m in the due front direction and has an effective fire-extinguishing distance of 4.8 m in the 45 direction.

(45) Test results of water amount distribution of the watering spray head, the water fog spray head, the single-nozzle spiral spray head, the three-nozzle spiral spray head, as well as the three-nozzle jet flow non-rotary spray head, are shown in FIG. 24.

(46) The test results indicate that: the three-nozzle jet flow non-rotary spray head has a spray shape of water curtain and a relatively small spray range, and the radial water amount distribution under the water curtain is high in the center and decreases as the radial distance increases.

(47) The water amount distribution conditions of the single-nozzle spiral spray head and the three-nozzle spiral spray head are similar. Among the three spiral spray nozzles, the central spray nozzle plays a major function, and the two lateral spiral spray nozzles has relatively small sprayed water amounts. Although they have better atomization effect, the spiral spray nozzles rely on the impact force and the friction force of the mechanical barrier, and thus there is hollowing phenomenon when spraying downwards. These spray heads have a maximum sprayed water amount at a distance of 1.5 m.

(48) The watering spray head has less water amount at the center because it uses a water splashing deflector. This has a maximum sprayed water amount at a distance of 2.5 m, and after that, its sprayed water amount decreases sharply.

(49) The water fog spray head has a barrier in the form of a rotary core structure positioned in the middle of the spray head, and has poor atomization effect. As can be seen from the figure, its spray density is small and uneven, is below 1.6, and cannot meet the fire-extinguishing requirement in most areas.

Embodiment 5: Spray Radii and Farthest Spray Distances of Different Rotary Spray Heads Under Different Pressures and in Different Spray Statuses

(50) By using the experiment method as described in Embodiment 4, spray radii when spraying downwards, spray radii and spray heights when spraying upwards as well as spray widths and farthest spray distances when spraying laterally of the three-nozzle jet flow rotary spray head (FIG. 1), the three-nozzle jet flow 45-nozzle-angle rotary spray head (FIG. 2), the spiral atomizing rotary spray head (FIG. 3), the three-nozzle jet flow single-needle atomizing spray head (FIG. 4) and the bullet-shaped rotary spray head (FIG. 10) under 2-kilogram pressure and under 3-kilogram pressure are measured. Meanwhile, by using the same method, spray radii when spraying downwards as well as spray widths and farthest spray distances when spraying laterally of the watering spray head and the water fog spray head currently on the market are measured. It can be seen that, when spraying upwards, downwards or laterally, the spray distances and ranges of the rotary spray heads are significantly larger than those of the spray heads in prior art, and especially, the spray distances when spraying upwards or laterally are farther, which satisfies the usage mode of most fire-extinguishing operations. The test results are listed in Table 3 and Table 4.

(51) TABLE-US-00003 TABLE 3 Spray radii and farthest spray distances of different rotary spray heads under different pressures and in different spray statuses spray head type three-nozzle spiral three-nozzle three-nozzle jet flow atomizing jet flow jet flow 45-nozzle-angle rotary double-needle bullet-shaped rotary spray rotary spray spray atomizing spray rotary spray head head head head head pressure (kilogram) 3 2 3 2 3 2 3 2 3 2 spraying downwards 5 3.8 3.2 2.8 5 3.8 3.5 3.2 4.25 3.5 spray radius (m) spraying spray radius 5 4 4 3.5 5 4 4.9 3.8 upwards spray height 4.5 3 5-6 3 4-5 3 4-5 3 (m) spraying spray width 8.4 5.8 7.2 5.5 8.8 6 7.5 5.6 8.2 5.7 laterally spray 21.7 14.1 21.8 13.8 20 12 20 13 4.7 4 (m) distance downwind

(52) TABLE-US-00004 TABLE 4 Spray radii and farthest spray distances of the rotary spray heads in prior art under different pressures and in different spray statuses spray head type watering spray head water fog spray head pressure (kilogram) 3 2 3 2 spraying downwards 2.9 1.7 3.1 2.7 spray radius (m) spraying spray width 3.3 1.8 6.2 2.3 laterally (m) spray distance 4.2 2.2 4 2.7 (m)

III. Evaluation of Gas Velocity in Tower and Desulfurization Effect of Flue Gas from Burning Boiler

(53) In order to further prove the effect of the swirling atomization technology in a confined space, test of gas velocity in tower and evaluation of sulfur dioxide elimination effect are performed in a boiler chimney (stainless steel tower) with a diameter of 1200 mm and a height of 10.5 m.

Embodiment 6: Test of Gas Velocity in Tower of Flue Gas from Burning Boiler (the Distribution of Testing Points in Tower is Shown in FIG. 21)

(54) Experiment 1: no fuel gas is supplied, only the induced draft fan is turned on (rated load is 40 Hz, induced air amount is 51000-69000 m.sup.3/h), the temperature in tower is 57 C. at tower top and 76 C. at tower bottom, thereby a blank experiment is conducted. The gas velocity in tower at different testing points is listed in Table 5. The tower has a diameter of 1.2 m and a height of 10 m.

(55) TABLE-US-00005 TABLE 5 Gas velocity at different points in tower when only the induced draft fan is turned on testing point direction 1 2 3 4 5 tower up 0 0 0 0 0 top down 8 6 8 7 7 left 0 0 0 0 0 right 0 0 0 0 0 tower up 0 0 0 0 0 middle down 6 7.5 10.5 8.5 6 left 4.5 5.5 5.5 4.5 5.5 right 5 5 4 3.5 4 tower up 4.5 0 6.5 0 0 bottom down 0 4.5 5.5 3.5 5 left 4.5 0 0 4.5 7 right 6 4.5 4 0 5

(56) Experiment 2: the fuel gas is turned on, with a coal gas amount of 1176 m.sup.3/h, both the blower (7600-15000 m.sup.3/h) and the induced draft fan (40 Hz, induced air amount is 51000-69000 m.sup.3/h) are turned on, the temperature in tower is 146 C. at tower top and 156 C. at tower bottom, the spray heads are not turned on, thereby another blank experiment is conducted. The gas velocity in tower at different testing points is listed in Table 6.

(57) TABLE-US-00006 TABLE 6 Gas velocity at different points when the fuel gas and the blower are turned on without water spray testing point direction 1 2 3 4 5 tower up 0 0 0 0 0 top down 5.5 4.5 5 5 6 left 0 0 0 7 7.5 right 6 4.5 0 0 0 tower up 0 0 0 0 0 middle down 6 4.5 0-3 5 6 left 0 0 0 4.5 7.5 right 4.5 5.5 0 0 0 tower up 2 0 2 0 2.5 bottom down 5.5 4.5 4.5 5 5 left 3.5 4 5 6 9 right 8 6 5 6 4

(58) Experiment 3: the fuel gas is turned on, the middle and lower spray heads are turned on with a water spray flow rate of 5.7-7.5 m.sup.3/h at the middle part and a water spray flow rate of 1.1-2.3 m.sup.3/h at the lower part, both the blower and the induced draft fan are turned on, the temperature is 43 C. at both the upper and lower parts, and the fuel gas amount is 1138 m.sup.3/h. The gas velocity in tower at different testing points is listed in Table 7.

(59) TABLE-US-00007 TABLE 7 Gas velocity at different points when the fuel gas and the blower are turned on and when water is sprayed from the middle and lower spray heads testing point direction 1 2 3 4 5 tower up 7 8.5 13 11.5 13 top down 24.5 10 14 14.5 19 left 15 13.5 16.5 7.5 10 right 8.5 11.5 11 12 6.5 tower up 3.5 5.5 6 4.5 4 middle down 12 14 15.5 24.5 19 left 14.5 12 23 17.5 19 right 18 10 12 12.5 12.5 tower up 13.5 19.5 10.5 21 14.5 bottom down 9 10 11.5 11 12 left 9.5 9.5 21.5 17 18 right 21.5 13.5 16.5 16 13

(60) Experiment 4: fan blades are added onto the spray heads (the fan blades are made of ABS engineering plastics, have a number of 3 and a diameter of 375 mm), and the other conditions are the same as those of Experiment 3. The gas velocity in tower at different testing points is listed in Table 8.

(61) TABLE-US-00008 TABLE 8 Gas velocity at different points when fan blades are added onto the spray heads testing point direction 1 2 3 tower up 14.5 31.5 31.5 top down 17 21 21 left 22.5 16.5 16.5 right 28.5 21.5 12.5 tower up 15.5 16.5 15.5 middle down 10 12.5 10 left 11.5 13.5 11.5 right 20 22.5 20 tower up 12.5 12 12.5 bottom down 11 20 11 left 9 12.5 9 right 15.5 12.5 15.5

(62) For the four different conditions of only turning on the induced draft fan, the fuel gas being further turned on, the spray heads being further turned on, and fan blades being added onto the spray heads, the gas velocity in different directions are sorted, as shown in Table 9 to Table 12.

(63) TABLE-US-00009 TABLE 9 Gas velocity test results (downward direction) tower top tower middle tower bottom B1 B2 B3 B4 B5 M1 M2 M3 M4 M5 T1 T2 T3 T4 T5 only turning on the 4.5 0 6.5 0 0 0 0 0 0 0 0 0 0 0 0 induced draft fan the fuel gas being 2 0 2 0 2.5 0 0 0 0 0 0 0 0 0 0 further turned on the spray heads being 13.5 19.5 10.5 21 14.5 3.5 5.5 6 4.5 4 7 8.5 13 11.5 13 further turned on fan blades being added 14.5 31.5 31.5 14.5 31.5 15.5 16.5 15.5 15.5 16.5 12.5 12 12.5 12.5 12 onto the spray heads

(64) TABLE-US-00010 TABLE 10 Gas velocity test results (upward direction) tower top tower middle tower bottom B1 B2 B3 B4 B5 M1 M2 M3 M4 M5 T1 T2 T3 T4 T5 only turning on the 0 4.5 5.5 3.5 5 6 7.5 10.5 8.5 6 8 6 8 7 7 induced draft fan the fuel gas being 5.5 4.5 4.5 5 5 6 4.5 1.5 5 6 5.5 4.5 5 5 6 further turned on the spray heads being 9 10 11.5 11 12 12 14 15.5 24.5 19 24.5 10 14 14.5 19 further turned on fan blades being added 17 21 21 17 21 10 12.5 10 10 12.5 11 20 11 11 20 onto the spray heads

(65) TABLE-US-00011 TABLE 11 Gas velocity test results (left direction) tower top tower middle tower bottom B1 B2 B3 B4 B5 M1 M2 M3 M4 M5 T1 T2 T3 T4 T5 only turning on the 4.5 0 0 4.5 7 4.5 5.5 5.5 4.5 5.5 0 0 0 0 0 induced draft fan the fuel gas being 3.5 4 5 6 9 0 0 0 4.5 7.5 0 0 0 7 7.5 further turned on the spray heads being 9.5 9.5 21.5 17 18 14.5 12 23 17.5 19 15 13.5 16.5 7.5 10 further turned on fan blades being added 22.5 16.5 16.5 22.5 16.5 11.5 13.5 11.5 11.5 13.5 9 12.5 9 9 12.5 onto the spray heads

(66) TABLE-US-00012 TABLE 12 Gas velocity test results (right direction) tower top tower middle tower bottom B1 B2 B3 B4 B5 M1 M2 M3 M4 M5 T1 T2 T3 T4 T5 only turning on the 6 4.5 4 0 5 5 5 4 3.5 4 0 0 0 0 0 induced draft fan the fuel gas being 8 6 5 6 4 4.5 5.5 0 0 0 6 4.5 0 0 0 further turned on the spray heads being 21.5 13.5 16.5 16 13 18 10 12 12.5 12.5 8.5 11.5 11 12 6.5 further turned on fan blades being added 28.5 21.5 12.5 28.5 21.5 20 22.5 20 20 22.5 15.5 12.5 15.5 15.5 12.5 onto the spray heads

(67) It can be seen that, in the downward direction, the gas velocity when the spray heads are turned on is larger than the gas velocity when the spray heads are not turned on, which indicates greater turbulence of swirling gas. The gas velocity when fan blades are added onto the spray heads is larger than the gas velocity when fan blades are not added onto the spray heads and can reach 22.5 m/s maximally. The gas velocity in the right direction which is consistent with the swirling direction is larger than the gas velocity in the left direction, which further indicates the swirling effect.

Embodiment 7: Evaluation of De-Dusting Desulfurization Effect of Flue Gas from Coal-Burning Boiler

(68) De-dusting desulfurization experiment by dual alkali method is conducted, and the related conditions and test results are as follows: the flow rate of flue gas is 55000N.Math.m.sup.3/h, the flue gas temperature is 180 C., the inlet SO.sub.2 concentration is 2000 mg/N.Math.m.sup.3, the tower has a diameter of 1.2 m and a height of 9 m, the liquid-gas ratio is 2/1000, the desulfurization liquid is a mixed solution of saturated lime water and 1% sodium hydroxide solution. Before revamping, the desulfurization efficiency is 90%, and the outlet sulfur dioxide content is 400 mg/N.Math.m.sup.3. After revamping, the desulfurization efficiency is around 99%, the outlet sulfur dioxide content is less than 50 mg/N.Math.m.sup.3, and the dust content can be reduced to 10 mg/N.Math.m.sup.3. These results fully prove that the swirling tower with the core component of the rotary spray heads can achieve high-efficient desulfurization and de-dusting, and render the discharge concentration of sulfur dioxide and dust of the purified flue gas from coal-burning boiler lower than the discharge standard threshold of burning boiler tail gas, which has significant meaning for haze control.

(69) TABLE-US-00013 TABLE 13 evaluation of de-dusting desulfurization effect of flue gas from coal-burning boiler particulate matter test temperature spray head particulate matter sulfur dioxide data C. flow rate calculation data content tower tower m.sup.3/h mg/m.sup.3 tower top Process type top bottom upper middle lower TSP PM10 PM2.5 mg/m.sup.3 untreated flue gas 97 94 0 0 0 40.5 33.2 19.2 4070 dual alkali method 46 46 0 3.8 2.1 8.865 8.835 7.275 64.19 pH > 13 dual alkali method 40 40 0 4.3 2.4 9.96 9.94 9.12 71.32 pH > 13 dual alkali method 40 41 0 4.4 2.4 6.67 6.66 6.29 89.16 pH > 13 dual alkali method 38 38 2.17 0 1.6 1.05 0.99 0.81 fan blades being added onto the spray heads

Embodiment 8: Evaluation of Fire-Extinguishing Effect

(70) Experiments are conducted according to the national fire-extinguishing standard of automatic water spray fire-extinguishing system (GB5135-2006): the wood pile has a size of 500*500*380 mm and consists of 10 layers of cedar wood that are oriented orthogonal to one another, wherein each layer has 5 strips that are evenly distributed and have a size of 38*38*500 mm. The wood pile is dried to a humidity of 6-12% and weighed. Then the wood pile is placed onto an oil tray made of steel, with a suitable water depth of >15 mm in the tray. Then 200 mL gasoline is poured into the tray. The spray head is placed at a height of 2.5 m directly above the wood pile. After initial burning for 2 min and the gasoline is burned out, the spray head is turned on. The experiment is kept for 10 min from ignition, and then the spray head is turned off. If the wood pile fire has not been extinguished at that time, it is carefully extinguished. Then, the burned wood pile is dried to a humidity of 6-12% and weighed, so as to calculate the mass loss. The change of PM10 and PM2.5 from before fire-extinguishing to after fire-extinguishing is monitored at a 6 m distance in the downwind direction. The results are shown in Table 14.

(71) By using the three-nozzle jet flow rotary spray head (FIG. 2), the result of the first test is as follows: under 2-kilogram water pressure, the downward-spray extinguishing process of the wood flame that has burned for 2 minutes after ignition by 200 mL gasoline takes only 10 seconds and consumes a water amount of 6.25 L, the complete extinguishing of smoke takes 70 seconds, and the average mass loss of the wood pile is 8.6%.

(72) By using the three-nozzle jet flow rotary spray head (FIG. 2), the result of the second test is as follows: under 2-kilogram water pressure, the downward-spray extinguishing process of the wood flame that has burned for 2 minutes after ignition by 200 mL gasoline takes only 8 seconds and consumes a water amount of 5 L, the complete extinguishing of smoke takes 70 seconds, and the average mass loss of the wood pile is 5.9%.

(73) The above-mentioned wood pile fire extinguishing experiment is conducted by using the three-nozzle jet flow double-needle 45-nozzle-angle atomizing spray head, and the test result is as follows: under 2-kilogram water pressure, the downward-spray extinguishing process of the wood flame that has burned for 2 minutes after ignition by 200 mL gasoline takes only 6 seconds and consumes a water amount of 3.75 L, the complete extinguishing of smoke takes 40 seconds, and the average mass loss of the wood pile is 6.4%.

(74) The above-mentioned wood pile fire extinguishing experiment is conducted by using the watering spray head in prior art, and the test result is as follows: under 2-kilogram water pressure, the downward-spray extinguishing process of the wood flame that has burned for 2 minutes after ignition by 200 mL gasoline has not extinguished the fire after 10 min, consumes a water amount of 1626.1 L, and the average mass loss of the wood pile is 19.7%.

(75) TABLE-US-00014 TABLE 14 fire-extinguishing effect of different types of rotary spray heads fire-extinguishing time PM2.5 PM10 flame smoke completely name condition (g/m.sup.3) (g/m.sup.3) wood loss extinguished extinguished three-nozzle jet flow before 825 1724 8.6% 10 s 1 min 10 s rotary spray head fire-extinguishing 1 min after 505 1065 fire-extinguishing three-nozzle jet flow before 782 1576 5.9% 8 s 1 min 10 s rotary spray head fire-extinguishing 1 min after 584 1292 fire-extinguishing three-nozzle jet flow before 753 1672 6.4% 6 s 40 s double-needle fire-extinguishing 45-nozzle-angle 1 min after 309 629 atomizing spray head fire-extinguishing watering spray head before 807 1741 19.7% fire not extinguished (on the market) fire-extinguishing after 10 min 1 min after 633 1520 fire-extinguishing
8.1 Fire-Extinguishing Experiment of Type-A Wood Pile Fire by Using a Hand-Held Bullet-Shaped Rotary Spray Head

(76) The above-mentioned wood pile and ignition method are used, 2 minutes after ignition, hand-held fire-extinguishing is performed by using a bullet-shaped rotary spray head under 3-kilogram water pressure. The spraying is started at a 1.8 m distance from the wood pile on the front side, then the spray head is move close to the wood pile and continuous spraying is directed towards the top and lateral sides. A thermocouple is placed at a 20 cm distance from the wood pile, so as to record the real-time temperature change. The test result is that, the extinguishing process of major flame takes only 10 s and consumes a water amount of 7.5 L, the complete extinguishing of smoke takes only 40 seconds and consumes a water amount of 30 L. The temperature measured by the thermocouple drops from 256 C. to 33 C. rapidly within 40 s after the spray head is turned on. The test result is shown in FIG. 25.

(77) 8.2 Fire-Extinguishing Experiment of Intensified Fire

(78) The above-mentioned wood pile is used, 200 mL gasoline is added into an oil tray under the wood pile, and meanwhile 2 L gasoline is poured onto the wood pile. Fire-extinguishing is started at 10 s after ignition. A three-nozzle jet flow double-needle 45-nozzle-angle atomizing spray head performs spraying at a height of 2.5 m directly above the wood pile. The burning is intense after ignition, and the flame reaches a height of over 3 m with thick smoke. After the spray head is turned on, it only takes 1 s to rapidly suppress the flame (with a water amount of 625 mL/s), the thick smoke quickly vanishes, the flame on the wood pile surface is extinguished after 5 s, the sporadic small fire inside the wood pile is completely extinguished after 40 s, with a total water consumption of only 25 L. After the water spraying is stopped, the wood pile has no smoke and does not reignite.

(79) 8.3 Fire-Extinguishing Experiment of Type-B Fire by Using a Hand-Held Three-Nozzle Jet Flow Double-Needle Atomizing Spray Head

(80) The type-B fire according to stipulation in the national standard GB4351-2005 is inflammable liquid fire. The experiment is conducted as follows: clear water with a height of 70 mm is placed into a round tray, then 1 L of 90# automobile gasoline is poured in. After initial burning for 10 s, fire-extinguishing is performed when the flame reaches a height of about 2 m. After fire-extinguishing is started, the height of the flame in the fire scene that has been covered is rapidly reduced, the water fog isolates the flame from the oil tray, and after about 12 s, the flame is completely extinguished, with a total water consumption of 7.5 L. After the fire is extinguished, the oil tray can be reignited for 5 times, which proves that, when a large amount of gasoline remains, a small amount of water that is atomized by this high-efficient rotary spray head is able to extinguish big fire of fuel oil.

(81) Apparently, the aforementioned embodiments are merely examples illustrated for clearly describing the present invention, rather than limiting the implementation ways thereof. For those skilled in the art, various changes and modifications in other different forms can be made on the basis of the aforementioned description. It is unnecessary and impossible to exhaustively list all the implementation ways herein. However, any obvious changes or modifications derived from the aforementioned description are intended to be embraced within the protection scope of the present invention.