Boiler ash remover based on combined flow

Abstract

A boiler ash remover based on a combined flow includes a frequency-adjustable acoustic flow generator, a fixing bracket, a compressed air source, a three-way air-source electric-control valve, an air jet generator, an acoustic-jet combined transmission tube, an acoustic jet intelligent control system, and a scale measurement and control sensor. The compressed air source is connected to an inlet end of the three-way air-source electric-control valve. An outlet end of the three-way air-source electric-control valve is connected to the frequency-adjustable acoustic flow generator and an air source inlet end of the air jet generator respectively. An acoustic flow outlet end of the frequency-adjustable acoustic flow generator is connected to an inlet end of the acoustic-jet combined transmission tube. An outlet end of the acoustic-jet combined transmission tube and a jet outlet end of the air jet generator are both disposed opposite to an external heat exchange component by means of the fixing bracket. The area of an acoustic flow transmission orifice at the outlet end of the acoustic-jet combined transmission tube covers that of a jet injection orifice at the jet outlet end of the air jet generator. The acoustic jet intelligent control system is connected to an electric control device of the three-way air-source electric-control valve and the scale measurement and control sensor respectively. The scale measurement and control sensor is disposed on the external heat exchange component. The boiler ash remover has the advantages of combining a frequency-adjustable acoustic flow with an air jet and implementing acoustic jet intelligent control, and has a desirable effect of removal of scales in a hearth or a flue gas heat exchanger.

Claims

1. A boiler ash remover based on a combined flow, comprising a frequency-adjustable acoustic flow generator comprising an air flow inlet, a single-moving-coil assembly, a single magnet, and an air flow outlet, a fixing bracket, a compressed air source, an adjustable air spray pipe, an acoustic-jet combined transmission tube, and an acoustic jet intelligent control system comprising a three-way air-source electric-control valve, scale measurement and control sensors, and a signal link of the acoustic jet intelligent control system comprising at least signal components of the scale measurement and control sensors, a scale measurement and control signal processor, an acoustic-jet balance signal modulator, and the three-way air-source electric-control valve that are sequentially in signal connection, wherein the compressed air source is connected to an inlet end of the three-way air-source electric-control valve, an outlet end of the three-way air-source electric-control valve is connected to the frequency-adjustable acoustic flow generator and an air source inlet end of the adjustable air spray pipe respectively, an acoustic flow outlet end of the frequency-adjustable acoustic flow generator is connected to an inlet end of the acoustic-jet combined transmission tube, an outlet end of the acoustic-jet combined transmission tube and a jet outlet end of the adjustable air spray pipe are on a same side of an air preheater by means of the fixing bracket, the area of an acoustic flow transmission orifice at the outlet end of the acoustic-jet combined transmission tube covers that of a jet injection orifice at the jet outlet end of the adjustable air spray pipe, the acoustic jet intelligent control system is connected to an electric control device of the three-way air-source electric-control valve and the scale measurement and control sensors respectively, and the scale measurement and control sensors are distributed on the air preheater, wherein an acoustic flow emitted by the frequency-adjustable acoustic flow generator and a jet emitted by the adjustable air spray pipe merge into a combined flow, and the acoustic flow, the jet emitted by the adjustable air spray pipe and the combined flow are in a same direction, wherein the adjustable air spray pipe is an adjustable air spray pipe, an outlet end of the adjustable air spray pipe is a conical air jet nozzle with air outlet holes, a number of the air outlet holes of the conical air jet nozzle is 4 to 12, a diameter of each of the air outlet hole is 3 mm to 6 mm, and an operating pressure of an air source of the adjustable air spray pipe is 0.1 to 0.5 MPa.

2. The boiler ash remover based on a combined flow according to claim 1, wherein the scale measurement and control sensors collect a signal of an amount of scale removed of the air preheater in real time, the signal of the amount of the scale removed is processed by the scale measurement and control signal processor, and a signal is generated by and is sent from the scale measurement and control signal processor to the acoustic-jet balance signal modulator and a feedback signal is generated by the acoustic-jet balance signal modulator to control the combined flow according to detection of the signal of the amount of the scale removed of the air preheater.

3. The boiler ash remover based on a combined flow according to claim 1, wherein the scale measurement and control sensors are thermocouples.

4. The boiler ash remover based on a combined flow according to claim 1, wherein the fixing bracket is disposed on a lower side and an upper side of the air preheater respectively, and the jet outlet ends of the acoustic-jet combined transmission tube and the adjustable air spray pipe are disposed at the upper side and the lower side of the air preheater respectively by means of the fixing bracket.

5. The boiler ash remover based on a combined flow according to claim 2, wherein the scale measurement and control sensors are thermocouples.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural diagram of an air jet generator according to the present invention.

(2) FIG. 2-1 and FIG. 2-2 are both schematic structural diagrams of a frequency-adjustable acoustic flow generator, where FIG. 2-1 is a schematic structural diagram of a frequency-adjustable single-tone single-frequency acoustic flow generator, and FIG. 2-2 is a schematic structural diagram of a frequency-adjustable dual-tone dual-frequency acoustic flow generator.

(3) FIG. 3 is a schematic structural diagram of a layout in which nozzles at an outlet end of an acoustic-jet combined transmission tube having an exponentially meandering shape and at a jet outlet end of an air jet generator are disposed opposite to a heat exchange component of an air preheater by means of a fixing bracket, according to Embodiment 1 of the present invention.

(4) FIG. 4 is a schematic structural diagram in which scale measurement and control sensors are disposed at corresponding positions of the heat exchange component of the air preheater in the directions east, west, south, north, and middle, according to Embodiment 1 of the present invention.

(5) FIG. 5 is a schematic block diagram of a signal link of an acoustic jet intelligent control system according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(6) A detailed description of the present invention will be further given below in detail with reference to the accompanying drawings and embodiments.

(7) A boiler ash remover based on a combined flow according to the present inventions includes a frequency-adjustable acoustic flow generator (3) and a fixing bracket (6), and further includes a compressed air source (1), a three-way air-source electric-control valve (2), an air jet generator (4), an acoustic-jet combined transmission tube (5), an acoustic jet intelligent control system, and scale measurement and control sensors (8). The compressed air source (1) is connected to an inlet end of the three-way air-source electric-control valve (2). An outlet end of the three-way air-source electric-control valve (2) is connected to the frequency-adjustable acoustic flow generator (3) and an air source inlet end of the air jet generator (4) respectively. An acoustic flow outlet end of the frequency-adjustable acoustic flow generator (3) is connected to an inlet end of the acoustic-jet combined transmission tube (5). An outlet end of the acoustic-jet combined transmission tube (5) and a jet outlet end of the air jet generator (4) are both disposed opposite to an external heat exchange component (9) by means of the fixing bracket (6). The area of an acoustic flow transmission orifice at the outlet end of the acoustic-jet combined transmission tube (5) covers that of a jet injection orifice at the jet outlet end of the air jet generator (4). The acoustic jet intelligent control system is connected to an electric control device of the three-way air-source electric-control valve (2) and the scale measurement and control sensors (8) respectively. The scale measurement and control sensors (8) are distributed on the external heat exchange component (9).

(8) Further preferred solutions of the boiler ash remover based on a combined flow according to the present invention are as follows.

(9) The air jet generator (4) is an adjustable air spray pipe, an outlet end of the air jet generator (4) is a conical air jet nozzle with air outlet holes, a number of the air outlet holes is 4 to 12, a size of the air outlet hole is 3 mm to 6 mm, and an operating pressure of an air source of the air jet generator (4) is 0.1 to 0.5 MPa.

(10) The frequency-adjustable acoustic flow generator (3) is a frequency-adjustable single-tone single-frequency acoustic flow generator that at least includes an air flow inlet, a single-moving-coil assembly, a single magnet, and an air flow outlet, or a frequency-adjustable dual-tone dual-frequency acoustic flow generator that at least includes an air flow inlet, a dual-moving-coil assembly, dual magnets, and an air flow outlet.

(11) An acoustic flow emitted by the frequency-adjustable acoustic flow generator (3) and a jet emitted by the air jet generator (4) merge into a combined wave of an acoustic jet in a same direction.

(12) The acoustic-jet combined transmission tube (5) has an exponentially meandering shape. A horn mouth of the outlet end of the acoustic jet combined transmission tube (5) has a rectangle shape, a trapezoidal shape, a circular shape, or a lotus shape.

(13) A signal link of the acoustic jet intelligent control system includes at least signal components of the scale measurement and control sensors (8), a scale measurement and control signal CPU processor, an acoustic-jet balance controller, and the three-way air-source electric-control valve (2) that are sequentially in signal connection. The scale measurement and control sensor (8) collects a scale removal amount parameter signal of the external heat exchange component (9) in real time. The scale removal amount parameter signal is first sent to the scale measurement and control signal CPU processor to be processed, and is then sent to the acoustic-jet balance controller to be modulated into a feedback signal for matching control of the combined flow. The feedback signal is then used to control the flows of the frequency-adjustable acoustic flow generator (3) and the compressed air source (1) of the air jet generator (4) respectively, by means of the three-way air-source electric-control valve (2), so as to achieve coordinated regulation of matching control of the combined flow according to detection of the scale removal amount parameter signal of the external heat exchange component (9).

(14) The scale measurement and control sensor (8) is a thermocouple type scale-simulation heat exchange component.

(15) The fixing bracket (6) is disposed on a lower side and an upper side of the external heat exchange component (9) respectively. The jet outlet ends of the acoustic-jet combined transmission tube (5) and the air jet generator (4) are disposed opposite to the upper side and the lower side of the external heat exchange component (9) by means of the fixing bracket (6) respectively.

(16) A boiler ash remover based on a combined flow according to the present invention is widely applicable to a heat exchange component such as an air preheater, a GGH, and a tail flue of a boiler system. Specific implementations of the present invention are further described below by using the application to the air preheater as an example.

(17) In Embodiment 1, a boiler ash remover based on a combined flow according to the present invention is used on an air preheater in a 300-MW thermal-power generating unit, for example. The design of Embodiment 1 is identical with the foregoing technical solution of the present invention. A specific implementation is:

(18) As shown in FIG. 1, an air jet generator (4) is disposed in Embodiment 1. The air jet generator (4) is an adjustable air spray pipe. An outlet end of the air jet generator (4) is a conical air jet nozzle with air outlet holes. A number of the air outlet holes of the conical air jet nozzle is 6. A size of the air outlet hole is 3 mm. An operating pressure of an air source of the air jet generator (4) is 0.2 MPa.

(19) As shown in FIG. 2-1, a frequency-adjustable acoustic flow generator (3) is disposed in Embodiment 1. The frequency-adjustable acoustic flow generator (3) is a frequency-adjustable single-tone single-frequency acoustic flow generator that at least includes an air flow inlet, a single-moving-coil assembly, a single magnet, and an air flow outlet. Coordination of energy of an acoustic flow of this single-tone single-frequency acoustic flow generator and energy of an air flow of the air jet generator (4) is fully applicable to removal of normal-state thin accumulated ash on the air preheater of the thermal-power generating unit.

(20) As shown in FIG. 3, two acoustic-jet combined transmission tubes (5) having an exponentially meandering shape are disposed in Embodiment 1. A horn mouth of an outlet end of the acoustic-jet combined transmission tube (5) is mounted opposite to an upper side and a lower side of an external heat exchange component (9) respectively by means of a fixing bracket (6). In addition, four nozzles at a jet outlet end of the air jet generator (4) are further disposed on the fixing bracket (6). The nozzles at the jet outlet end of the air jet generator (4) are mounted at positions opposite to the heat exchange component (9) of the air preheater and are covered by an acoustic-flow transmission area of an outlet end of the acoustic-jet combined transmission tube (5).

(21) As shown in FIG. 4, five scale measurement and control sensors (8) are disposed in Embodiment 1, and are preferably distributed at corresponding positions of the heat exchange component (9) of the air preheater in the directions east, west, south, north, and middle. The scale measurement and control sensor (8) is a thermocouple type scale-simulation heat exchange component. The scale measurement and control sensor (8) transfers a heat-exchange working condition parameter in real time to an acoustic jet intelligent control system.

(22) As shown in FIG. 5, the acoustic jet intelligent control system is disposed in Embodiment 1. A signal link of the acoustic jet intelligent control system includes at least signal components of the scale measurement and control sensors (8), a scale measurement and control signal CPU processor, an acoustic-jet balance controller, and a three-way air-source electric-control valve (2) that are sequentially in signal connection. The scale measurement and control sensor (8) collects a scale removal amount parameter signal of the heat exchange component (9) of the air preheater in real time. The scale removal amount parameter signal is first sent to the scale measurement and control signal CPU processor to be processed, and is then sent to the acoustic-jet balance controller to be modulated into a feedback signal for matching control of the combined flow. The feedback signal is then used to control the flows of the frequency-adjustable acoustic flow generator (3) and a compressed air source (1) of the air jet generator (4) respectively, by means of the three-way air-source electric-control valve (2), so as to achieve coordinated regulation of matching control of the combined flow according to detection of the scale removal amount parameter signal of the heat exchange component (9) of the air preheater.

(23) In Embodiment 2, a boiler ash remover based on a combined flow according to the present invention is used on an air preheater in a 600-MW thermal-power generating unit, for example. The design of Embodiment 2 is identical with the foregoing technical solution of the present invention. A specific implementation is:

(24) As shown in FIG. 1, an air jet generator (4) is disposed in Embodiment 2. The air jet generator (4) is an adjustable air spray pipe. An outlet end of the air jet generator (4) is a conical air jet nozzle with air outlet holes. A number of the air outlet holes of the conical air jet nozzle is 8. A size of the air outlet hole is 4 mm. An operating pressure of an air source of the air jet generator (4) is 0.3 MPa.

(25) As shown in FIG. 2-2, a frequency-adjustable acoustic flow generator (3) is disposed in Embodiment 2. The frequency-adjustable acoustic flow generator (3) is a frequency-adjustable dual-tone dual-frequency acoustic flow generator that at least includes an air flow inlet, a dual-moving-coil assembly, dual magnets, and an air flow outlet. In this dual-tone dual-frequency acoustic flow generator, a high-tone high-frequency acoustic wave that is generated after a compressed air flow flows through a high-tone high-frequency acoustic generation whistle and a low-tone low-frequency acoustic wave that is formed through reflection by a low-tone low-frequency acoustic wave generation cover are coupled and superimposed, to generate a dual-tone dual-frequency strip-frequency acoustic wave, and energy of the acoustic flow greatly exceeds that of a single-tone single-frequency acoustic flow generator. Coordination of energy of an acoustic flow of this dual-tone dual-frequency acoustic flow generator and energy of an air flow of the air jet generator (4) is fully applicable to removal of non-normal-state thick accumulated ash on the air preheater of the thermal-power generating unit.

(26) As shown in FIG. 3, two acoustic-jet combined transmission tubes (5) having an exponentially meandering shape are disposed in Embodiment 2. A horn mouth of an outlet end of the acoustic jet combined transmission tube (5) is mounted opposite to an upper side and a lower side of an external heat exchange component (9) respectively by means of a fixing bracket (6). In addition, four nozzles at a jet outlet end of the air jet generator (4) are further disposed on the fixing bracket (6). The nozzles at the jet outlet end of the air jet generator (6) are mounted at positions opposite to the heat exchange component (9) of the air preheater and are covered by an acoustic-flow transmission area of an outlet end of the acoustic-jet combined transmission tube (5).

(27) As shown in FIG. 4, five scale measurement and control sensors (8) are disposed in Embodiment 2, and are preferably distributed at corresponding positions of the heat exchange component (9) of the air preheater in the directions east, west, south, north, and middle. The scale measurement and control sensor (8) is a thermocouple type scale-simulation heat exchange component. The scale measurement and control sensor (8) transfers a heat-exchange working condition parameter in real time to an acoustic jet intelligent control system.

(28) As shown in FIG. 5, the acoustic jet intelligent control system is disposed in Embodiment 2. A signal link of the acoustic jet intelligent control system includes at least signal components of the scale measurement and control sensors (8), a scale measurement and control signal CPU processor, an acoustic-jet balance controller, and a three-way air-source electric-control valve (2) that are sequentially in signal connection. The scale measurement and control sensor (8) collects a scale removal amount parameter signal of the heat exchange component (9) of the air preheater in real time. The scale removal amount parameter signal is first sent to the scale measurement and control signal CPU processor to be processed, and is then sent to the acoustic-jet balance controller to be modulated into a feedback signal for matching control of the combined flow. The feedback signal is then used to control the flows of the frequency-adjustable acoustic flow generator (3) and a compressed air source (1) of the air jet generator (4) respectively, by means of the three-way air-source electric-control valve (2), so as to achieve coordinated regulation of matching control of the combined flow according to detection of the scale removal amount parameter signal of the heat exchange component (9) of the air preheater.

(29) In Embodiment 3, a boiler ash remover based on a combined flow according to the present invention is used on an air preheater in a 1000-MW thermal-power generating unit, for example. The design of Embodiment 3 is identical with the foregoing technical solution of the present invention. A specific implementation is:

(30) As shown in FIG. 1, an air jet generator (4) is disposed in Embodiment 3. The air jet generator (4) is an adjustable air spray pipe. An outlet end of the air jet generator (5) is a conical air jet nozzle with air outlet holes. A number of the air outlet holes of the conical air jet nozzle is 12. A size of the air outlet hole is 4 mm. An operating pressure of an air source of the air jet generator (4) is 0.4 MPa.

(31) As shown in FIG. 2-2, a frequency-adjustable acoustic flow generator (3) is disposed in Embodiment 3. The frequency-adjustable acoustic flow generator (3) is a frequency-adjustable dual-tone dual-frequency acoustic flow generator that at least includes an air flow inlet, a dual-moving-coil assembly, dual magnets, and an air flow outlet. In this dual-tone dual-frequency acoustic flow generator, a high-tone high-frequency acoustic wave that is generated after a compressed air flow flows through a high-tone high-frequency acoustic generation whistle and a low-tone low-frequency acoustic wave that is formed through reflection by a low-tone low-frequency acoustic wave generation cover are coupled and superimposed, to generate a dual-tone dual-frequency strip-frequency acoustic wave, and energy of the acoustic flow greatly exceeds that of a single-tone single-frequency acoustic flow generator. Coordination of energy of an acoustic flow of this dual-tone dual-frequency acoustic flow generator and energy of an air flow of the air jet generator (4) is fully applicable to removal of non-normal-state thick accumulated ash on the air preheater of the thermal-power generating unit.

(32) As shown in FIG. 3, two acoustic-jet combined transmission tubes (5) having an exponentially meandering shape are disposed in Embodiment 3. A horn mouth of an outlet end of the acoustic-jet combined transmission tube (5) is mounted opposite to an upper side and a lower side of an external heat exchange component (9) respectively by means of a fixing bracket (6). In addition, four nozzles at a jet outlet end of the air jet generator (4) are further disposed on the fixing bracket (6). The nozzles at the jet outlet end of the air jet generator (10) are mounted at positions opposite to the heat exchange component (9) of the air preheater and are covered by an acoustic-flow transmission area of an outlet end of the acoustic-jet combined transmission tube (5).

(33) As shown in FIG. 4, five scale measurement and control sensors (8) are disposed in Embodiment 3, and are preferably distributed at corresponding positions of the heat exchange component (9) of the air preheater in the directions east, west, south, north, and middle. The scale measurement and control sensor (8) is a thermocouple type scale-simulation heat exchange component. The scale measurement and control sensor (8) transfers a heat-exchange working condition parameter in real time to an acoustic jet intelligent control system.

(34) As shown in FIG. 5, the acoustic jet intelligent control system is disposed in Embodiment 3. A signal link of the acoustic jet intelligent control system includes at least signal components of the scale measurement and control sensors (8), a scale measurement and control signal CPU processor, an acoustic-jet balance controller, and a three-way air-source electric-control valve (2) that are sequentially in signal connection. The scale measurement and control sensor (8) collects a scale removal amount parameter signal of the heat exchange component (9) of the air preheater in real time. The scale removal amount parameter signal is first sent to the scale measurement and control signal CPU processor to be processed, and is then sent to the acoustic-jet balance controller to be modulated into a feedback signal for matching control of the combined flow. The feedback signal is then used to control the flows of the frequency-adjustable acoustic flow generator (3) and a compressed air source (1) of the air jet generator (4) respectively, by means of the three-way air-source electric-control valve (2), so as to achieve coordinated regulation of matching control of the combined flow according to detection of the scale removal amount parameter signal of the heat exchange component (9) of the air preheater.

(35) The contents not specifically described in the specific embodiments of the present invention are known in the art and may be implemented with reference to known techniques.

(36) The present invention has been verified via repeated tests, and satisfactory test results are achieved.

(37) The foregoing specific implementations and embodiments are used to provide specific support for the technical concept of a boiler ash remover based on a combined flow according to the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent change or equivalent variation made to the technical solutions according to the technical concept of the present invention still falls within the protection scope of the technical solution of the present invention.