Air separation surplus waste nitrogen energy-saving recycling system

Abstract

The utility model relates to the technical field of air separation, in particular to an air separation surplus waste nitrogen energy-saving recycling system, and aims to solve the problems that in the current air separation process, as surplus waste nitrogen discharged by a unit is difficult to fully utilize, a water cooling tower is extremely easy to generate low-temperature crystallization, and the energy consumption is low. And finally, the problems of relatively poor operation stability of air separation equipment and relatively low overall efficiency of air separation production are solved. The system is mainly composed of an air cooling tower, an air cooling pump, a regulating valve, a waste nitrogen cold outlet box, a control system and the like, on one hand, the temperature of water is higher than that of waste nitrogen, and therefore the temperature of the water is reduced after heat exchange; on the other hand, the waste nitrogen is dry and low in relative humidity, water molecules are continuously evaporated and diffused into the waste nitrogen, heat is taken away from water due to the fact that the waste nitrogen is unsaturated and water evaporation needs to absorb latent heat of vaporization, the temperature of the water is continuously reduced, and then the phenomenon of low-temperature crystallization of the water cooling tower caused by air separation surplus waste nitrogen is effectively avoided; therefore, the production requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to air separation technical field, concretely relates to a kind of air separation surplus dirty nitrogen energy recycling system. BACKGROUND

[0002] Dirty nitrogen is a medium in air separation process, dry gas containing 1%-3% oxygen is introduced into water cooling tower, on the one hand, the temperature of water is higher than the temperature of dirty nitrogen, the temperature of water is reduced after heat exchange, on the other hand, dirty nitrogen is relatively dry, the relative humidity is only 30%, water molecules evaporate and diffuse into dirty nitrogen continuously, water evaporation needs to absorb latent heat of vaporization, heat is taken away from water, so that the temperature of water is continuously reduced. At present, in most air separation production, most dirty nitrogen is almost all sent into water cooling tower system, causing the bottom of water cooling tower to operate at low temperature, which easily leads to low-temperature crystallization of medicament in circulating water, blocking the waterway pipeline of air cooling pump and air cooling tower, thereby being forced to clean the filter after pump and the nozzle at the top of air cooling tower irregularly, greatly increasing the maintenance amount and maintenance time, and seriously causing the upper spraying device of air cooling tower to fail, the temperature of air out of air cooling tower is high, and leading to air separation being forced to stop for maintenance. Therefore, it is necessary to further optimize the overall utilization structure of air separation surplus dirty nitrogen. SUMMARY

[0003] The utility model provides a kind of air separation surplus dirty nitrogen energy recycling system to solve the problems existing in the above background.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A kind of air separation surplus dirty nitrogen energy recycling system, including air cooling tower, air cooling tower is connected with multiple first air cooling pumps, air cooling tower is also connected with refrigerator, refrigerator is connected with water cooling tower, water cooling tower is connected with 2# air separation dirty nitrogen gas out cold box by conveying pipeline, pneumatic diaphragm regulating valve is equipped on the conveying pipeline of 2# air separation dirty nitrogen gas out cold box, and pneumatic diaphragm regulating valve is connected to 2# air separation control system.

[0006] Further, multiple second air cooling pumps are provided between the refrigerator and the bottom of the water cooling tower, and a third air cooling pump is further connected to the side of the water cooling tower.

[0007] Further, a stop valve is provided on the conveying pipeline between the pneumatic diaphragm regulating valve and the 2# air separation dirty nitrogen gas out cold box.

[0008] Further, a molecular sieve is further connected to the air cooling tower.

[0009] The utility model has the following beneficial effects:

[0010] The utility model provides a kind of air separation redundant dirty nitrogen energy saving and recycling system, it is mainly by air cooling tower, air cooling pump, regulating valve, dirty nitrogen gas out cold box and air separation control system etc.

[0011] In the utility model, 2# air separation part dirty nitrogen bypasses to 1#, the dirty nitrogen gas amount of entering 2# air separation water cooling tower reduces, water cooling tower bottom water temperature promotes, eliminates the risk of low temperature crystallization, effectively improves the ability of equipment winter stable operation, reduces the risk of air separation fault shutdown;Meanwhile, part dirty nitrogen bypasses to 1#, and the dirty nitrogen amount of entering 1# air separation water cooling tower increases, and the load of supporting refrigerator reduces, realizes saving electricity. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is whole structure schematic diagram of the utility model.

[0013] The meaning of reference signs is as follows:

[0014] 1, air cooling tower;2, first air cooling pump;3, refrigerator;4, second air cooling pump;5, molecular sieve;6, water cooling tower;7, conveying pipeline;8, pneumatic diaphragm regulating valve;9, 2# air separation control system;10, stop valve;11, 2# air separation dirty nitrogen gas out cold box;12, third air cooling pump;13, pure nitrogen;14, low-temperature water;15, compressed air;16, pressurized backwater. DETAILED DESCRIPTION

[0015] The utility model will be further described below in connection with the drawings and specific embodiment.

[0016] As shown in the drawing, Figure 1 A kind of air separation redundant dirty nitrogen energy saving and recycling system, including air cooling tower 1, air cooling tower 1 is connected with multiple first air cooling pump 2, air cooling tower 1 is also connected with refrigerator 3, refrigerator 3 is connected with water cooling tower 6, water cooling tower 6 is connected with 2# air separation dirty nitrogen gas out cold box 11 by conveying pipeline 7, pneumatic diaphragm regulating valve 8 is equipped on the conveying pipeline 7 of 2# air separation dirty nitrogen gas out cold box 11, and pneumatic diaphragm regulating valve 8 is connected to 2# air separation control system 9.

[0017] The second air cooling pump 4 is arranged between the freezer 3 and the bottom of the water cooling tower 6, and the third air cooling pump 12 is further connected to the side of the water cooling tower 6.

[0018] The stop valve 10 is arranged on the conveying pipeline 7 between the pneumatic diaphragm regulating valve 8 and the air separation dirty nitrogen outlet cooling tank 11.

[0019] The molecular sieve 5 is further connected to the air cooling tower 1.

[0020] In the specific application, part of the dirty nitrogen of the 2# air separation equipment is bypassed to the pipeline of the 1# air separation dirty nitrogen into the water cooling tower 6 through the pneumatic diaphragm regulating valve 8, so that the amount of the dirty nitrogen into the 1# air separation is increased, on the one hand, the temperature of the water is higher than that of the dirty nitrogen, and the temperature of the water is reduced after the dirty nitrogen is used as a cold source for heat exchange; on the other hand, the dirty nitrogen is relatively dry, and the water molecules are continuously evaporated and diffused into the dirty nitrogen, the latent heat of vaporization is taken away from the water, and the temperature of the water is continuously reduced, thereby meeting the production demand, and the load of the freezer 3 is reduced, so that the energy consumption is saved. At the same time, after part of the dirty nitrogen is bypassed to the 1# air separation water cooling tower 6, the amount of the dirty nitrogen into the 2# air separation water cooling tower 6 is reduced, and the risk that the medicine in the water is low-temperature crystallized after a large amount of the dirty nitrogen in the 2# air separation equipment is heat-exchanged in the water cooling tower 6 is effectively avoided, so that the system has good practicability.

Claims

1. An energy-saving recycling system for excess nitrogen from air separation, characterized by: The air cooling tower (1) includes an air cooling tower (1) connected to a plurality of first air cooling pumps (2), the air cooling tower (1) is further connected to a refrigerator (3), the refrigerator (3) is connected to a water cooling tower (6), the water cooling tower (6) is connected to a 2# air separation waste nitrogen gas outlet cold box (11) via a delivery pipe (7), a pneumatic diaphragm regulating valve (8) is provided on the delivery pipe (7) of the 2# air separation waste nitrogen gas outlet cold box (11), and the pneumatic diaphragm regulating valve (8) is connected to a 2# air separation control system (9).

2. The energy-saving recycling system for excess nitrogen from air separation according to claim 1 is characterized by: A plurality of second air-cooling pumps (4) are provided between the freezer (3) and the bottom of the water-cooling tower (6), and a third air-cooling pump (12) is further connected to the side of the water-cooling tower (6).

3. The energy-saving recycling system for excess nitrogen from air separation according to claim 1 is characterized by: A stop valve (10) is provided on the delivery pipeline (7) between the pneumatic diaphragm regulating valve (8) and the 2# air separation contaminated nitrogen gas outlet cold box (11).

4. The energy-saving recycling system for excess nitrogen from air separation according to claim 1 is characterized by: The air cooling tower (1) is also connected to a molecular sieve (5).

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