FLUID LINE SYSTEM AND CORRESPONDING METHOD

Abstract

A fluid line system including at least one liquid supply line, at least one gas supply line and at least two elongated fluid conduits is provided. Of the at least two elongated fluid conduits, at least one fluid conduit is an outer fluid conduit which completely encloses another fluid conduit which is inner fluid conduit. The liquid supply line is connected to the outer fluid conduit so that a liquid fluid can flow between the inner and outer fluid conduits. The gas supply line is connected to the inner fluid conduit so that a gaseous fluid can flow in the inner fluid conduit. A method for injecting a fluid mixture through a nozzle supplied by the fluid system is also.

Claims

1-10. (canceled)

11. A fluid line system comprising: at least one liquid supply line (3); at least one gas supply line (4); and at least two elongated fluid conduits (1, 2), of which at least one fluid conduit is an outer fluid conduit (1) which completely surrounds another fluid conduit which is an inner fluid conduit; (2), wherein the liquid supply line (3) is connected to the outer fluid conduit (1) so that a liquid fluid can flow between the inner fluid conduit and the outer fluid conduit, wherein the gas supply line (4) is connected to the inner fluid conduit (2) so that a gaseous fluid can flow in the inner fluid conduit (2), and wherein the thermal conductivity of the wall of the outer fluid conduit (1) is greater than the thermal conductivity of the wall of the inner fluid conduit (2).

12. The fluid line system according to claim 11, wherein the gas supply line (4) is adapted for supplying gases with a pressure of >2 bar, wherein, preferably, the liquid supply line (3) comprises a liquid pump and/or the gas supply line (4) comprises a gas pump, and, in particular, one of the supply lines or both supply lines additionally include(s) an open-loop control or closed-loop control system for the particular pump.

13. The fluid line system according to claim 11, wherein the thermal conductivity of the wall of the outer fluid conduit (1) is greater than 8 W/(m.Math.K), and/or the thermal conductivity of the wall of the inner fluid conduit (2) is less than 8 W/(m.Math.K).

14. The fluid line system according to claim 11, wherein the fluid line system additionally comprises at least one further fluid conduit, through which a fluid for cooling or heating can be passed.

15. The fluid line system according to claim 11, wherein the fluid line system includes a closed-loop control system for controlling the temperature, the pressure or the flow rate of the fluids, and that the fluid line system preferably includes at least one temperature sensor, wherein preferably at least one temperature sensor is arranged at the fluid outlet.

16. The fluid line system according to claim 11, wherein, at an end which faces a nozzle (8), it comprises a mixing chamber (5) for mixing the liquid and the gas, or a chamber for interchanging the flow path of the gas, which is directed in the inner fluid conduit (2), with the liquid, which is carried between the outer fluid conduit (1) and the inner fluid conduit (2).

17. The fluid line system according to claim 16, wherein, between the fluid conduits (1, 2) and the nozzle system (7, 8) or the intended position of the nozzle, it comprises a throttle (6) which, in particular, is arranged downstream a mixing chamber (5), wherein the diameter of the flow area of the throttle (6) is preferably between 50% and 150% of the diameter of the inner fluid conduit (2), particularly preferably between 50% and 95% and/or between 105% and 150% of the diameter of the inner fluid conduit.

18. The fluid line system according to claim 16, wherein it comprises, at the opposite end of the supply lines (3,4), a nozzle system (7, 8) including at least one nozzle (8) through which the fluids can exit.

19. A nozzle system equipped with a fluid line system according to claim 11.

20. An injection method, using a device according to claim 11, the method comprising the steps of: supplying a liquid, separately from a gas, under an adjustable pressure, to a mixing chamber (5), mixing of liquid and gas, and passing these through a throttle (6) closing the mixing chamber (5), expansion of the liquid-gas mixture downstream the throttle (6), in a nozzle chamber (7), and injecting the liquid-gas mixture into a space, wherein the pressure of the supplied liquid and/or the pressure of the supplied gas is adjusted so that a periodically alternating injection takes place.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0060] The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.

[0061] In the drawings:

[0062] FIG. 1 schematically shows a preferred fluid line system.

[0063] FIG. 2 schematically shows a preferred embodiment incorporating a nozzle.

[0064] FIG. 3 shows, by way of example, the distribution of the injected fluid.

DETAILED DESCRIPTION OF THE INVENTION

[0065] FIG. 1 schematically shows a preferred fluid line system. This fluid line system comprises a liquid conduit 1 (in which the oblique section is to indicate an elongated design), a gas conduit 2, which is enclosed by the liquid conduit 1 (see cross-sectional representation above the middle arrow). The liquid conduit is designed as a corrugated tube, which is only a preferred embodiment, however. The liquid is introduced into the fluid line system through a liquid supply line 3, and the gas is directed through a gas supply line 4 (arrows on the left) into the central tube.

[0066] On the right hand-side of the fluid line system, an optional mixing chamber 5 is shown, in which the liquid can mix with the gas. Attached to the mixing chamber there is an optional pressure reducer 6, through which the liquid-gas mixture can exit (right arrow).

[0067] FIG. 2 schematically shows a preferred embodiment, including a nozzle. This embodiment, too, comprises the inventive fluid line system including the fluid conduit 1 (in which an oblique section is to indicate an elongated design), the gas conduit 2, the liquid supply line 3 and the gas supply line 4. In a mixing chamber 5, the liquid and the gas mix and enter a nozzle chamber 7 through a pressure reducer 6. This expands the gas somewhat. Through the nozzle 8, the mixture finally exits, as indicated by the dashed lines. In this way, periodically discrete distance intervals, or a wide distance interval, can be sprayed.

[0068] FIG. 3 shows, by way of example, the distribution of the injected fluid achieved by an arrangement according to FIG. 2, in the form of 3 curves, A, B and C. This distribution can also be referred to as “sprinkle density”. On the x-axis, the graph shows the distance from the point of exit of the fluid mixture, i.e. the place where the fluid leaves the nozzle, and on the y-axis, the graph shows the amount of fluid which, given an undisturbed flight, would reach a certain floor area (see also the various sprinkling positions of the dashed trajectories in FIG. 2).

[0069] Since the absolute progression of the curves depends on several factors, such as the position of the nozzle above the ground, the liquid pressure, the gas pressure or the throttle diameter, the graph only shows the qualitative progression at different gas pressure and/or at different liquid pressure. The remaining parameters are assumed to be constant. In curve A the pressure is lowest, curve C has the highest pressure, and curve B has a pressure between those of curves A and C.

[0070] It can be seen that as the pressure increases, a flattening of the curve occurs, which corresponds to a more homogeneous injection, seen over the distance. From a certain pressure (not shown), the homogeneity decreases again, since chaotic processes take place during injection. The corresponding distribution depends very much on the type of these chaotic processes, so that a representation is impracticable.

[0071] In one practical example, compressed air, together with a reaction liquid, is directed to a nozzle in a 20-m-long corrugated hose in which another hose, having a diameter of 8 mm, runs coaxially thereto.

[0072] The compressed air is directed within the central hose, and the reaction liquid is directed within the corrugated hose outside the central tube. In front of a throttle, the liquid mixes with the compressed air, and they are jointly expanded behind the throttle. The next expansion occurs in the outlet slot of the downstream nozzle and, given a correct adjustment of the pressure, even leads to an automatically occurring pulsation effect.

[0073] For this design, practical quantities for the liquid and for the compressed air are 0-3200 liters/h at 5 bar for the compressed air, and 500-1200 l/h for the liquid. The slot of the nozzle is 0.1-1 mm, for example, and the throttle diameter is between 0.5 and 1.5 cm.

[0074] Using the above arrangement, a sufficiently uniform distribution of the liquid is achieved with little effort in terms of control technology. With a higher quantity of air, the distribution becomes more homogeneous. The throwing distance is increased by the supply of air.

[0075] It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.