Air separation precooling device

Abstract

The utility model relates to an air separation precooling device which comprises an air cooling tower, a water cooling tower, a cooling tower, a chilled water conveying pipe, a first chilled water return pipe, a circulating water conveying pipe and a circulating water return pipe. A second stop valve is arranged on the desalted water conveying pipe, a third stop valve is arranged on the chilled water discharging pipe, a first filter, a first booster pump, a water cooling unit, a second chilled water return pipe, a temperature sensor, a first adjusting valve and a first liquid flow sensor are arranged on the chilled water conveying pipe, and the second chilled water return pipe is communicated with the water cooling tower; and a second regulating valve and a second liquid flow sensor are arranged on the second chilled water return pipe. Calcium ions in chilled water can be always maintained in a suitable range, so that the phenomenon that crystals formed by the calcium ions in a low-temperature state are attached to air cooling tower packing is reduced, and the air cooling tower is convenient to use and has a wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of air separation precooling equipment, in particular to an air separation precooling device. Background Art

[0002] The cold source of the air cooling tower in the air separation precooling system mainly comes from circulating cooling water and chilled water. Among them, the normal temperature water of the water supply system can be converted into circulating cooling water by cooling the air cooling tower. The chilled water is obtained by recooling the return water of the air cooling tower by the water cooling tower. During the cooling process, the dirty nitrogen and nitrogen after the plate heat exchange of the cold box are mainly required to participate in cooling the circulating water through the "latent heat of vaporization". Before the chilled water is used, it is necessary to collect the chilled water at the bottom of the water cooling tower, and then pump it to the upper part of the air cooling tower with the help of a chilled water pump, so as to achieve the cooling and washing of the compressed air.

[0003] Since the chilled water of the existing process is the circulating water cooled by the cooling tower, filtered and cooled by the water cooling tower for the second time, after the second cooling, the secondary cooling water transported out by the water cooling tower is selected according to the actual working conditions whether to pass through the water cooling unit for the third cooling to form the final low-temperature chilled water to be transported to the air cooling tower as the cold source for the second stage cooling of the compressed air. However, with the continuous use of circulating water, when the circulating water concentration multiple is high, a mixed crystal of calcium carbonate pentahydrate and calcium carbonate hexahydrate will be produced at low temperature. This causes the filler in the second stage cooling area of ​​the air cooling tower to be easily attached to the mixed crystal, thereby reducing the heat exchange efficiency, and the outlet temperature of the air cooling tower is 3℃ to 5℃ higher than the design temperature, which makes it difficult to ensure the normal operation of the subsequent molecular sieve adsorption system, and then leads to a serious accident of forced parking. When the mixed crystals are attached to the filler, it is difficult to remove the mixed crystals from the filler. The filler can only be replaced and the filler attached with the mixed crystals removed and slowly cleaned before it can be used again. Once the above phenomenon occurs, the maintenance cycle is too long. If it occurs frequently, it will greatly affect the air separation system's output of corresponding gaseous or liquid products, thereby affecting the air separation system's supporting production system. Therefore, the speed of the appearance of the mixed crystals should be slowed down to solve the technical problem of forced shutdown caused by the technical problem, so as to reduce the losses caused by forced shutdown of the enterprise. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides an air separation precooling device capable of always maintaining the calcium ions in the chilled water within an appropriate range, thereby reducing the formation of calcium ions in a low temperature state to form crystals attached to the air cooling tower filler, so as to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is as follows: an air separation precooling device comprises an air cooling tower, wherein the air cooling tower is provided with an outlet end of a chilled water delivery pipe, an inlet end of a first chilled water return pipe, an outlet end of a circulating water delivery pipe and an inlet end of a circulating water return pipe, a water cooling tower is provided on the outlet end of the chilled water delivery pipe and the inlet end of the first chilled water return pipe, a cooling tower is provided on the outlet end of the circulating water delivery pipe and the inlet end of the circulating water return pipe, and the first chilled water return pipe is provided with a conductivity tester, an inlet end of a chilled water discharge pipe, a first cut-off valve and a cooling tower in sequence along the direction from the air cooling tower to the water cooling tower A valve and the outlet end of the desalted water delivery pipe, a second stop valve is arranged on the desalted water delivery pipe, the outlet end of the chilled water discharge pipe is connected to the inlet end of the cooling tower, a third stop valve is arranged on the chilled water discharge pipe, and the first filter, the first booster pump, the water cooling unit, the inlet end of the second chilled water return pipe, the temperature sensor, the first regulating valve and the first liquid flow sensor are arranged on the chilled water delivery pipe in sequence along the direction from the water cooling tower to the air cooling tower, the outlet end of the second chilled water return pipe is connected to the water cooling tower, and the second chilled water return pipe is provided with a second regulating valve and a second liquid flow sensor.

[0006] Preferably, the air-cooling tower comprises a first tower body, a first drain pipe, a first packing layer, a first nozzle, a partition, a second drain pipe, a second packing layer, a second nozzle and a wire mesh coalescer, and an air lift cap arranged on the partition; the outlet end of the chilled water delivery pipe is connected to the second nozzle, and the inlet end of the first chilled water return pipe is connected to the second drain pipe; the water-cooling tower comprises a second tower body and a third packing layer and a third nozzle arranged on the second tower body along the direction from the bottom end of the second tower body to the top end of the second tower body, the outlet end of the first chilled water return pipe is connected to the third nozzle, and the outlet end of the second chilled water return pipe and the inlet end of the chilled water delivery pipe are respectively connected to the second tower body below the third packing layer.

[0007] Preferably, the partition includes a circular plate, the top end of a first connecting ring arranged on the outside of the circular plate, and a second connecting ring arranged on the outside of the bottom end of the first connecting ring. The inner cavity of the first tower body between the second connecting ring and the circular plate is connected to the inlet end of the second drain pipe. Several air lift caps are used, and several air lift caps are installed on the circular plate.

[0008] Preferably, filter tanks are respectively provided on the first chilled water return pipe between the conductivity tester and the chilled water discharge pipe and the circulating water return pipe, the filter tank comprising a tank body, a filter plate arranged in the tank body and an exhaust valve arranged on the tank body above the filter plate, and a second boosting pump and a second filter are sequentially provided on the first chilled water return pipe between the filter tank installed on the first chilled water return pipe and the chilled water discharge pipe along the direction away from the chilled water discharge pipe to close to the chilled water discharge pipe.

[0009] Preferably, the tank body below the filter plate, the first tower body below the first packing layer, and the second tower body below the third packing layer are respectively provided with drain pipes, and drain pipes are provided with drain valves, the tank body above the filter plate, the first tower body below the first packing layer, and the second tower body below the third packing layer are respectively provided with liquid level sensors, and a turbidity sensor is provided on the tank body below the filter plate.

[0010] Preferably, a booster filter device is provided on the circulating water delivery pipe, the number of the booster filter devices is at least two, several of the booster filter devices are connected in parallel, and each of the booster filter devices includes a booster filter tube and a fourth stop valve, a third filter, a third booster pump and a fifth stop valve which are sequentially arranged on the booster filter tube along the direction from close to the cooling tower to away from the cooling tower.

[0011] The utility model has the following beneficial effects: firstly, the utility model utilizes desalted water as chilled water, and as the chilled water circulation time continues, the electrical conductivity continues to increase, and when there are too many salts dissolved in the chilled water and the concentration is too high, the chilled water can be transported to the cooling tower through the chilled water discharge pipe to join the circulating water circulation, thereby avoiding the precipitation of calcium carbonate pentahydrate and calcium carbonate hexahydrate under low temperature conditions, and further achieving the goal of always maintaining the calcium ions in the chilled water within an appropriate range, thereby reducing the formation of calcium ions under low temperature conditions to form crystals attached to the air-cooling tower filler.

[0012] Secondly, the first chilled water return pipe of the utility model is provided with a conductivity tester, an inlet end of a chilled water discharge pipe, a first stop valve and an outlet end of a desalted water delivery pipe in sequence along the direction from the air cooling tower to the water cooling tower. The installation of the conductivity tester facilitates the feedback of corresponding conductivity parameters.

[0013] Finally, the tank body above the filter plate, the first tower body below the first packing layer, and the second tower body below the third packing layer described in the utility model are respectively provided with liquid level sensors, and the tank body below the filter plate is provided with a turbidity sensor; installing the liquid level sensor facilitates the feedback of liquid level parameters, and installing the turbidity sensor facilitates the feedback of turbidity parameters.

[0014] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0017] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B. DETAILED DESCRIPTION

[0018] like Figures 1 to 3 As shown, an air separation precooling device comprises an air cooling tower, wherein the air cooling tower is provided with an outlet end of a chilled water delivery pipe 1, an inlet end of a first chilled water return pipe 2, an outlet end of a circulating water delivery pipe 3 and an inlet end of a circulating water return pipe 4, a water cooling tower is provided on the outlet end of the chilled water delivery pipe 1 and the inlet end of the first chilled water return pipe 2, a cooling tower 5 is provided on the outlet end of the circulating water delivery pipe 3 and the inlet end of the circulating water return pipe 4, and the first chilled water return pipe 2 is provided with a conductivity tester 6, an inlet end of a chilled water discharge pipe 7, a first stop valve 8 and an outlet end of a desalted water delivery pipe 9 in sequence along the direction from the air cooling tower to the water cooling tower, A second stop valve 10 is provided on the brine delivery pipe 9, the outlet end of the chilled water discharge pipe 7 is connected to the inlet end of the cooling tower 5, and a third stop valve 11 is provided on the chilled water discharge pipe 7. A first filter 12, a first booster pump 13, a water cooling unit 14, an inlet end of a second chilled water return pipe 15, a temperature sensor 16, a first regulating valve 17 and a first liquid flow sensor 18 are sequentially provided on the chilled water delivery pipe 1 along the direction from the water cooling tower to the air cooling tower. The outlet end of the second chilled water return pipe 15 is connected to the water cooling tower, and a second regulating valve 19 and a second liquid flow sensor 20 are provided on the second chilled water return pipe 15.

[0019] The air cooling tower comprises a first tower body 21, a first drain pipe 22, a first packing layer 23, a first nozzle 24, a partition 25, a second drain pipe 26, a second packing layer 27, a second nozzle 28 and a wire mesh coalescer 29, and an air lift cap 30 arranged on the partition 25; the outlet end of the chilled water delivery pipe 1 is connected to the second nozzle 28, the inlet end of the first chilled water return pipe 2 is connected to the second drain pipe 26, the water cooling tower comprises a second tower body 31 and a third packing layer 32 and a third nozzle 33 arranged in sequence along the bottom end of the second tower body 31 to the top end of the second tower body 31, the outlet end of the first chilled water return pipe 2 is connected to the third nozzle 33, the outlet end of the second chilled water return pipe 15 and the inlet end of the chilled water delivery pipe 1 are respectively connected to the second tower body 31 below the third packing layer 32.

[0020] The partition 25 includes a circular plate, the top of a first connecting ring arranged on the outside of the circular plate, and a second connecting ring arranged on the outside of the bottom end of the first connecting ring. The circular plate adopts a circular plate structure, and the first connecting ring adopts a circular tube structure. The circular plate is installed at the top of the inner cavity of the first connecting ring. The second connecting ring adopts a circular ring plate structure. The bottom of the first connecting ring is installed in the inner cavity of the second connecting ring. The inner cavity of the first tower body 21 between the second connecting ring and the circular plate is connected to the inlet end of the second drain pipe 26. The number of air lift caps 30 is several, and several air lift caps 30 are installed on the circular plate.

[0021] A third regulating valve 48 is arranged on the circulating water return pipe 4, and filter tanks are respectively arranged on the first chilled water return pipe 2 between the conductivity tester 6 and the chilled water discharge pipe 7 and the circulating water return pipe 4. The filter tank installed on the circulating water return pipe 4 is located above the cooling tower 5, and the filter tank includes a tank body 34, a filter plate 35 arranged in the tank body 34, and an exhaust valve 36 arranged on the tank body 34 above the filter plate 35. A second boosting pump 37 and a second filter 38 are sequentially arranged on the first chilled water return pipe 2 between the filter tank installed on the first chilled water return pipe 2 and the chilled water discharge pipe 7 along the direction away from the chilled water discharge pipe 7 to close to the chilled water discharge pipe 7.

[0022] The circulating water or chilled water is transported to the tank body 34 below the filter plate 35, and then passes through the filter plate 35 for filtering after multiple deflections. The filter plate 35 of the filter tank is used to filter the particles into the inner cavity of the tank body 34 below the filter plate 35, thereby reducing the amount of particles carried by the chilled water or circulating water after passing through the filter tank. Further, the tank body 34 below the filter plate 35, the first tower body 21 below the first packing layer 23, and the second tower body 31 below the third packing layer 32 are respectively provided with a sewage pipe 39, and a sewage valve 40 is provided on the sewage pipe 39. The tank body 34 above the filter plate 35, the first tower body 21 below the first packing layer 23, and the second tower body 31 below the third packing layer 32 are respectively provided with a liquid level sensor 41, and the tank body 34 below the filter plate 35 is provided with a turbidity sensor 42. When the value fed back by the turbidity sensor 42 reaches a preset range, the drain pipe 39 can be opened to discharge the liquid containing the particles in the tank body 34 below the filter plate 35, thereby maintaining the particles in the liquid in the tank body 34 below the filter plate 35 within an appropriate range.

[0023] The circulating water delivery pipe 3 is provided with a boosting filter device, the number of which is at least two, and several of the boosting filter devices are connected in parallel. Each of the boosting filter devices includes a boosting filter pipe 43 and a fourth stop valve 44, a third filter 45, a third boosting pump 46 and a fifth stop valve 47 sequentially arranged on the boosting filter pipe 43 in a direction from close to the cooling tower 5 to away from the cooling tower 5. Installing several boosting filter devices connected in parallel is conducive to the continuous supply of circulating water.

[0024] The usage of this product is as follows: Figures 1 to 3 As shown, the following steps are included:

[0025] S1, the compressed air after filtration and pressurization is delivered to the inner cavity of the first tower body 21 below the first packing layer 23, and then undergoes a first countercurrent heat exchange with the circulating water as the first cold source sprayed out through the first nozzle 24, and then the compressed air continues to ascend through the air lift cap 30 on the partition 25, and undergoes a second countercurrent heat exchange with the sprayed chilled water as the second cold source, and then completes the cooling process of the compressed air after gas-liquid separation through the wire mesh coalescer 29, and is delivered to the molecular sieve adsorption system for the next process treatment.

[0026] The outlet of the cooling tower 5 circulates water through the circulating water pipe 3 after being pressurized and filtered by the pressurized filtering device in working state. Since the air cooling tower receives compressed air, the pressure in the inner cavity of the first tower body 21 of the air cooling tower is actually higher than the external pressure. After entering the inner cavity of the first tower body 21 and completing the first countercurrent heat exchange with the compressed air, it is transported to the circulating water return pipe 4 through the first drain pipe 22, filtered through the filter tank on the circulating water return pipe 4, and then sent back to the cooling tower 5 for cooling again, forming a circulating water cycle.

[0027] The third nozzle 33 transports desalted water into the second tower body 31 and receives the dirty nitrogen gas discharged from the distillation system as the second cold source from the inner cavity of the second tower body 31 below the third packing layer 32 for countercurrent heat exchange, thereby forming high-temperature chilled water, which is then sent to the chilled water delivery pipe 1 and cooled again by the water cooling unit 14 to form low-temperature chilled water, which is then divided into two parts. The first part of the low-temperature chilled water continues to move along the chilled water delivery pipe 1 and is transported to the first tower body 21 through the second nozzle 28 as compressed air to complete the second countercurrent heat exchange of the second cold source, during which the temperature parameter needs to be fed back by the temperature sensor 16 and the flow parameter needs to be fed back by the first liquid flow sensor 18; the second part of the low-temperature chilled water is sent back to the inner cavity of the second tower body 31 below the third packing layer 32 through the second chilled water return pipe 15 to directly exchange heat with the desalted water that has undergone countercurrent heat exchange. In the actual process, the opening of the first regulating valve 17 and the opening of the second regulating valve 19 should be reasonably adjusted according to the temperature parameter fed back by the temperature sensor 16 so that the temperature parameter fed back by the temperature sensor 16 is within a reasonable range.

[0028] When the low-temperature chilled water entering the second nozzle 28 is transported, the compressed air is compressed in the first tower body 21 to complete the second countercurrent heat exchange, and then it is transported outward through the second drain pipe 26 to the first chilled water return pipe 2, and the conductivity parameters are fed back by the conductivity tester 6. Then, the first filtration of the chilled water is completed through the filter tank on the first chilled water return pipe 2. When this product is put into use for the first time, the desalted water received by the third nozzle 33 is completely provided by the desalted water delivery pipe 9.

[0029] S2. When the liquid level parameters fed back by the liquid level sensor 41 installed on the second tower body 31 and the liquid level sensor 41 installed on the tank body 34 on the first chilled water return pipe 2 reach the preset liquid level height, close the second stop valve 10 and open the first stop valve 8 and the second booster pump 37. At this time, the chilled water that has completed the first filtration of the chilled water through the filter tank on the first chilled water return pipe 2 passes through the second filter 38 to complete the second filtration of the circulating water, and then is pressurized again by the second booster pump 37 and delivered to the third nozzle 33 to form a chilled water circulation.

[0030] S3. When the conductivity parameter fed back by the conductivity tester 6 exceeds the preset range, it indicates that the salt content in the chilled water is higher than the preset range. If the chilled water circulation is continued, salt crystals will precipitate under low temperature, including calcium carbonate pentahydrate and calcium carbonate hexahydrate. At this time, the first stop valve 8 should be closed again and the second stop valve 10 and the third stop valve 11 should be opened. The desalted water delivery pipe 9 continues to receive the desalted water provided by the outside and delivers it to the inner cavity of the second tower body 31 through the third nozzle 33, and the chilled water pressurized again by the second booster pump 37 is delivered to the cooling tower 5 through the chilled water discharge pipe 7 to join the circulating water circulation, until the conductivity parameter fed back by the conductivity tester 6 is within a reasonable range again, the second stop valve 10 and the third stop valve 11 are closed and the first stop valve 8 is opened again, so as to form the chilled water circulation again.

[0031] It should also be noted that in steps S2 and S3, as the time of the chilled water cycle increases, the total amount of chilled water actually participating in the chilled water cycle should be estimated based on the flow parameters fed back by the first liquid flow sensor 18, the flow parameters fed back by the second liquid flow sensor 20, the liquid level parameters fed back by the liquid level sensor 41 installed on the second tower body 31, and the liquid level parameters fed back by the liquid level sensor 41 installed on the tank body 34 on the first chilled water return pipe 2. When the total amount of chilled water is lower than the preset value, desalted water should be supplemented to the first chilled water return pipe 2 through the desalted water delivery pipe 9 to maintain the total amount of chilled water in the chilled water cycle within an appropriate range.

[0032] Through this embodiment, desalted water is used as chilled water, and as the chilled water circulation time continues, the conductivity continues to increase. When there are too many salts dissolved in the chilled water and the concentration is too high, it can be transported to the cooling tower 5 through the chilled water discharge pipe 7 to join the circulating water circulation, thereby avoiding the precipitation of calcium carbonate pentahydrate and calcium carbonate hexahydrate under low temperature conditions, and further achieving the goal of always maintaining the calcium ions in the chilled water within an appropriate range, thereby reducing the formation of calcium ions under low temperature conditions to form crystals attached to the air-cooling tower filler.

[0033] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. An air separation precooling device, comprising an air cooling tower, wherein the air cooling tower is provided with an outlet end of a chilled water delivery pipe (1), an inlet end of a first chilled water return pipe (2), an outlet end of a circulating water delivery pipe (3) and an inlet end of a circulating water return pipe (4), a water cooling tower is provided on the outlet end of the chilled water delivery pipe (1) and the inlet end of the first chilled water return pipe (2), and a cooling tower (5) is provided on the outlet end of the circulating water delivery pipe (3) and the inlet end of the circulating water return pipe (4), characterized in that: The first chilled water return pipe (2) is provided with a conductivity tester (6), an inlet end of a chilled water discharge pipe (7), a first stop valve (8) and an outlet end of a desalted water delivery pipe (9) in sequence along the direction from the air cooling tower to the water cooling tower; the desalted water delivery pipe (9) is provided with a second stop valve (10); the outlet end of the chilled water discharge pipe (7) is connected to the inlet end of the cooling tower (5); the chilled water discharge pipe (7) is provided with a third stop valve (11); the chilled water delivery pipe (1) is provided with a first filter (12), a first booster pump (13), a water cooling unit (14), an inlet end of a second chilled water return pipe (15), a temperature sensor (16), a first regulating valve (17) and a first liquid flow sensor (18) in sequence along the direction from the water cooling tower to the air cooling tower; the outlet end of the second chilled water return pipe (15) is connected to the water cooling tower; the second chilled water return pipe (15) is provided with a second regulating valve (19) and a second liquid flow sensor (20).

2. The air separation precooling device according to claim 1, characterized in that: The air cooling tower comprises a first tower body (21), a first drainage pipe (22), a first packing layer (23), a first nozzle (24), a partition (25), a second drainage pipe (26), a second packing layer (27), a second nozzle (28), a wire mesh coalescer (29), and an air lift cap (30) arranged on the partition (25); the outlet end of the chilled water delivery pipe (1) is connected to the second nozzle (28), and the first chilled water return pipe (21) is connected to the outlet end of the chilled water delivery pipe (1). The inlet end of the water pipe (2) is connected to the second drain pipe (26), the water cooling tower comprises a second tower body (31) and a third packing layer (32) and a third nozzle (33) arranged in sequence along the direction from the bottom end of the second tower body (31) to the top end of the second tower body (31), the outlet end of the first chilled water return pipe (2) is connected to the third nozzle (33), and the outlet end of the second chilled water return pipe (15) and the inlet end of the chilled water delivery pipe (1) are respectively connected to the second tower body (31) below the third packing layer (32).

3. The air separation precooling device according to claim 2 is characterized in that: The partition plate (25) comprises a circular plate, a top end of a first connecting ring arranged on the outer side of the circular plate, and a second connecting ring arranged on the outer side of the bottom end of the first connecting ring. The inner cavity of the first tower body (21) between the second connecting ring and the circular plate is connected to the inlet end of the second drainage pipe (26). The number of air lift caps (30) is several, and the several air lift caps (30) are all installed on the circular plate.

4. The air separation precooling device according to claim 2, characterized in that: A filter tank is provided on the first chilled water return pipe (2) between the conductivity tester (6) and the chilled water discharge pipe (7) and the circulating water return pipe (4), respectively. The filter tank comprises a tank body (34), a filter plate (35) provided in the tank body (34), and an exhaust valve (36) provided on the tank body (34) above the filter plate (35). A second booster pump (37) and a second filter (38) are provided in sequence on the first chilled water return pipe (2) between the filter tank installed on the first chilled water return pipe (2) and the chilled water discharge pipe (7) in a direction away from the chilled water discharge pipe (7) to close to the chilled water discharge pipe (7).

5. The air separation precooling device according to claim 4, characterized in that: A sewage pipe (39) is provided on the tank body (34) below the filter plate (35), the first tower body (21) below the first packing layer (23), and the second tower body (31) below the third packing layer (32), respectively. A sewage pipe (39) is provided on the sewage pipe (39). A sewage valve (40) is provided on the sewage pipe (39). A liquid level sensor (41) is provided on the tank body (34) above the filter plate (35), the first tower body (21) below the first packing layer (23), and the second tower body (31) below the third packing layer (32), respectively. A turbidity sensor (42) is provided on the tank body (34) below the filter plate (35).

6. The air separation precooling device according to claim 1, characterized in that: A boosting filter device is provided on the circulating water delivery pipe (3), the number of the boosting filter devices is at least two, and a plurality of the boosting filter devices are connected in parallel. Each of the boosting filter devices comprises a boosting filter pipe (43) and a fourth stop valve (44), a third filter (45), a third boosting pump (46) and a fifth stop valve (47) which are sequentially arranged on the boosting filter pipe (43) along a direction from close to the cooling tower (5) to away from the cooling tower (5).

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