Cooling circulation and waste heat recovery device of air compressor

Abstract

The utility model belongs to the technical field of air compressors, and particularly relates to an air compressor cooling circulation and waste heat recovery device which comprises a centrifugal compressor, a first raw water tank and a second raw water tank. A first raw water inlet and a cooling water return inlet are formed in the top of the first raw water tank, a second raw water inlet is formed in the top of the second raw water tank, a raw water outlet is formed in one side of the second raw water tank, and the water outlet end of the second raw water tank is connected with the centrifugal compressor through a cooling water supply pipeline. The cooling water supply pipeline is provided with a first cooling water supply pump and a second cooling water supply pump which are connected. The air compressor cooling circulation system can be achieved, redundant waste heat can be collected through circulation heat exchange to be supplied to a desalted water station for desalted water preparation, on one hand, equipment investment of the air compressor circulation water station is reduced, on the other hand, hot water is provided for the desalted water station, and steam energy consumption of the desalted water station is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a cooling cycle and waste heat recovery device for an air compressor. Background Art

[0002] In large-scale chemical production enterprises, air compression systems are indispensable as necessary power systems. Compressed air is mainly used for instrument air, equipment purging air, and maintenance air. Currently, the commonly used air compressors are mainly screw air compressors and centrifugal air compressors. In order to meet the requirements of refined, intelligent, and low-energy chemical production, air compression systems are also different from traditional single equipment selection. Different equipment combinations are more used to improve efficiency.

[0003] When the air compressor is running, it converts electrical energy into air potential energy, compresses the air and stores the compressed air in the compressor. However, the electrical energy actually used to increase the air potential energy consumption accounts for only a small part of the total power consumption. Most of the electrical energy is converted into heat and discharged into the air through cooling. In order to improve the air compression efficiency and stability of the air compressor, both screw air compressors and centrifugal air compressors must be cooled. Traditional cooling methods mainly include air cooling and water cooling. The air compressor water cooling system needs to be equipped with a cooling tower and a circulating water pump. The cooling cycle water enters the air compressor and absorbs heat through heat exchange. The outlet water passes through the cooling tower and uses the water to exchange heat and mass with the air passing through it, causing the water temperature to drop. The air compressor is cooled and cooled in a reciprocating cycle.

[0004] However, in the prior art, no matter whether air cooling or water cooling is adopted, all the heat energy generated during the operation of the air compressor is dissipated into the air, and the heat energy cannot be recovered and utilized, thus resulting in energy waste. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the above background technology that the heat energy generated during the operation of the air compressor is all dissipated into the air and the heat energy cannot be recovered and utilized, and to propose an air compressor cooling cycle and waste heat recovery device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An air compressor cooling cycle and waste heat recovery device comprises a centrifugal compressor, a first raw water tank and a second raw water tank, wherein the bottom of the first raw water tank is provided with a raw water supply port of a desalted water station, the top of the first raw water tank is provided with a first raw water inlet and a cooling water return inlet, respectively, the top of the second raw water tank is provided with a second raw water inlet, one side of the second raw water tank is provided with a raw water outlet, the water outlet end of the second raw water tank is connected to the centrifugal compressor through a cooling water supply pipeline, the cooling water supply pipeline is provided with a first cooling water supply pump and a second cooling water supply pump, the water outlet end of the centrifugal compressor is connected to the first raw water tank through a cooling return water pipeline, the cooling return water pipeline is provided with a first pipeline pump and a second pipeline pump, and one end of the cooling return water pipeline close to the first pipeline pump and the second pipeline pump is provided with a third pressure transmitter and a hand valve.

[0008] Preferably, a first liquid level gauge is provided on one side of the first raw water tank, and a first shut-off valve is connected to the top of the first liquid level gauge.

[0009] Preferably, a second liquid level gauge is provided on one side of the second raw water tank, and a second shut-off valve is connected to the top of the second liquid level gauge.

[0010] Preferably, the cooling water return pipeline is provided with a third shut-off valve and a fourth shut-off valve corresponding to the first pipeline pump and the second pipeline pump respectively.

[0011] Preferably, a first pressure transmitter and a first temperature transmitter are provided at one end of the cooling water supply pipeline close to the centrifugal compressor.

[0012] Preferably, a second temperature transmitter and a second pressure transmitter are provided at one end of the cooling water return pipe close to the centrifugal compressor.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. In addition to realizing the air compressor cooling circulation system, the utility model can also utilize the circulating heat exchange to collect excess waste heat for the desalting water station to prepare desalted water. On the one hand, it reduces the equipment investment of the air compressor circulating water station, and on the other hand, it provides hot water for the desalting water station, reducing the steam energy consumption of the desalting water station;

[0015] 2. The utility model can realize the stable operation of a centrifugal air compressor. At the same time, according to the actual situation, multiple centrifugal air compressors and screw air compressors can be connected in parallel to form a more stable air compression system, which can reduce the investment in circulating cooling water system equipment, effectively recover waste heat and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the structure of an air compressor cooling cycle and waste heat recovery device.

[0017] In the figure: 1. centrifugal compressor; 2. first pipeline pump; 3. second pipeline pump; 4. first raw water tank; 5. second raw water tank; 6. first liquid level gauge; 7. second liquid level gauge; 8. first shut-off valve; 9. second shut-off valve; 10. first cooling water supply pump; 11. second cooling water supply pump; 12. cooling water supply pipeline; 13. cooling return water pipeline; 14. first pressure transmitter; 15. first temperature transmitter; 16. second temperature transmitter; 17. second pressure transmitter; 18. third shut-off valve; 19. fourth shut-off valve; 20. third pressure transmitter; 21. hand valve; 22. first raw water inlet; 23. second raw water inlet; 24. cooling water return inlet; 25. raw water supply port of desalted water station; 26. raw water outlet. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1 , an air compressor cooling cycle and waste heat recovery device, comprising a centrifugal compressor 1, a first raw water tank 4 and a second raw water tank 5, a desalted water station raw water supply port 25 is provided at the bottom of the first raw water tank 4, a first liquid level gauge 6 is provided on one side of the first raw water tank 4, a first shut-off valve 8 is connected to the top of the first liquid level gauge 6, a first raw water inlet 22 and a cooling water return inlet 24 are respectively provided at the top of the first raw water tank 4, and a second raw water inlet 23 is provided at the top of the second raw water tank 5;

[0020] In this embodiment, a raw water outlet 26 is provided on one side of the second raw water tank 5, a second liquid level gauge 7 is provided on one side of the second raw water tank 5, a second shut-off valve 9 is connected to the top of the second liquid level gauge 7, the water outlet of the second raw water tank 5 and the centrifugal compressor 1 are connected via a cooling water supply pipe 12, a first cooling water supply pump 10 and a second cooling water supply pump 11 are provided on the cooling water supply pipe 12, and a first pressure transmitter 14 and a first temperature transmitter 15 are provided at one end of the cooling water supply pipe 12 close to the centrifugal compressor 1, which are used to monitor in real time whether the cooling water inlet temperature and pressure meet the air compressor operation requirements;

[0021] In this embodiment, the water outlet of the centrifugal compressor 1 is connected to the first raw water tank 4 through a cooling water return pipe 13, and a third shut-off valve 18 and a fourth shut-off valve 19 corresponding to the first pipeline pump 2 and the second pipeline pump 3 are provided on the cooling water return pipe 13, and the first pipeline pump 2 and the second pipeline pump 3 are provided on the cooling water return pipe 13;

[0022] In this embodiment, a third pressure transmitter 20 and a hand valve 21 are provided at one end of the cooling return water pipe 13 close to the first pipeline pump 2 and the second pipeline pump 3, and a second temperature transmitter 16 and a second pressure transmitter 17 are provided at one end of the cooling return water pipe 13 close to the centrifugal compressor 1, which are used to monitor the cooling cycle return water pressure and temperature in real time.

[0023] In this embodiment, the second raw water tank 5 is replenished with raw water through the second raw water inlet 23, and the second shut-off valve 9 on the pipeline and the second liquid level gauge 7 on the bottom side of the tank are interlocked and controlled through the DCS system to set the minimum liquid level and the maximum liquid level to keep the liquid level in the second raw water tank 5 constant. The raw water outlet 26 pipeline is connected to the first cooling water supply pump 10 and the second cooling water supply pump 11 (one for use and one for backup), and is connected to the cooling water supply inlet of the air compressor through the cooling water supply pipeline 12. The pipeline inlet is provided with a first pressure transmitter 14, The first temperature transmitter 15 monitors the cooling water inlet temperature and pressure in real time to see if they meet the air compressor operation requirements. After circulating inside the air compressor to absorb the heat generated by the air compressor, the cooling water return outlet of the air compressor is connected to the cooling return water pipe 13. The cooling water return outlet is provided with a second pressure transmitter 17 and a second temperature transmitter 16 to monitor the cooling circulation return water pressure and temperature in real time to ensure that the circulating cooling water supply and circulating cooling water return pressure difference is 0.08-0.15Mpa, so as to ensure that the air compressor temperature is not too high.

[0024] In this embodiment, the cooling water returns to the first raw water tank 4 through the cooling return water pipeline 13. If the return water pressure is insufficient, close the third shut-off valve 18, open the fourth shut-off valve 19 and the hand valve 21, enable the first pipeline pump 2 and the second pipeline pump 3 (one in use and one in reserve), and set a third pressure transmitter at the outlet to monitor the cooling water return water pressure in real time to ensure the normal operation of the entire circulation system. The cooling water return water absorbs the heat generated by the air compressor and the temperature can be increased by 5-10°C. It is stored in the first raw water tank 4 through the cooling water return water inlet 24, and hot water is supplied to the desalting water station through the desalting water station raw water supply port 25 on the bottom side of the tank for desalting water preparation. At the same time, in order to ensure the stable operation of the desalting water station system, the first shut-off valve 8 and the first liquid level meter 6 are interlocked and controlled through the DCS system to ensure the liquid level of the first raw water tank 4.

[0025] In this embodiment, not only can a centrifugal air compressor be operated stably, but also multiple centrifugal air compressors and screw air compressors can be connected in parallel according to actual conditions to form a more stable air compression system, thereby reducing the investment in circulating cooling water system equipment, effectively recovering waste heat, and reducing energy consumption.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An air compressor cooling cycle and waste heat recovery device, comprising a centrifugal compressor (1), a first raw water tank (4) and a second raw water tank (5), characterized in that: The bottom of the first raw water tank (4) is provided with a raw water supply port (25) of a desalted water station, the top of the first raw water tank (4) is provided with a first raw water inlet (22) and a cooling water return inlet (24), the top of the second raw water tank (5) is provided with a second raw water inlet (23), one side of the second raw water tank (5) is provided with a raw water outlet (26), the water outlet end of the second raw water tank (5) is connected to the centrifugal compressor (1) via a cooling water supply pipe (12), and the cooling water return pipe (24) is provided with a cooling water return pipe (26). A first cooling water supply pump (10) and a second cooling water supply pump (11) are connected on the water pipeline (12); the water outlet of the centrifugal compressor (1) is connected to the first raw water tank (4) via a cooling water return pipeline (13); a first pipeline pump (2) and a second pipeline pump (3) are provided on the cooling water return pipeline (13); and a third pressure transmitter (20) and a hand valve (21) are provided at one end of the cooling water return pipeline (13) close to the first pipeline pump (2) and the second pipeline pump (3).

2. The air compressor cooling cycle and waste heat recovery device according to claim 1, characterized in that: A first liquid level gauge (6) is provided on one side of the first raw water tank (4), and a first shut-off valve (8) is connected to the top of the first liquid level gauge (6).

3. The air compressor cooling cycle and waste heat recovery device according to claim 1, characterized in that: A second liquid level gauge (7) is provided on one side of the second raw water tank (5), and a second shut-off valve (9) is connected to the top of the second liquid level gauge (7).

4. The air compressor cooling cycle and waste heat recovery device according to claim 1, characterized in that: The cooling water return pipeline (13) is provided with a third shut-off valve (18) and a fourth shut-off valve (19) corresponding to the first pipeline pump (2) and the second pipeline pump (3) respectively.

5. The air compressor cooling cycle and waste heat recovery device according to claim 1, characterized in that: A first pressure transmitter (14) and a first temperature transmitter (15) are provided at one end of the cooling water supply pipeline (12) close to the centrifugal compressor (1).

6. The air compressor cooling cycle and waste heat recovery device according to claim 1, characterized in that: A second temperature transmitter (16) and a second pressure transmitter (17) are provided at one end of the cooling water return pipe (13) close to the centrifugal compressor (1).

Images