Natural gas screw compressor self-circulation cooling and heat recycling device

Abstract

The utility model belongs to the technical field of natural gas screw compressors, and particularly relates to a self-circulation cooling and heat recycling device of a natural gas screw compressor. The self-circulation cooling and heat recycling device of the natural gas screw compressor comprises the natural gas screw compressor, an inlet of the natural gas screw compressor is connected with a duplex filter A, an outlet of the natural gas screw compressor is connected with a cooler, the cooler is connected with a gas-liquid separator, the lower portion of the gas-liquid separator is connected with a duplex filter B, and the duplex filter B is connected with a heat exchanger. The duplex filter B is connected with a natural gas screw compressor, and the top of the gas-liquid separator is connected with two coalescers connected in parallel. According to the self-circulation cooling and heat recycling device of the natural gas screw compressor, forced cooling is carried out in the mode that desalted water is directly injected, self-circulation in a system is achieved through pressure in the system and a cooler device, meanwhile, heat generated in the cooling process can exchange heat with the desalted water, and the heat recycling efficiency is improved. And cyclic utilization of heat is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas screw compressors, and in particular relates to a natural gas screw compressor self-circulating cooling and heat recovery device. Background Art

[0002] As screw compressors continuously compress natural gas, mechanical energy is converted into internal energy, causing the temperature of the screw unit and the compressed gas inside to rise, generating a large amount of heat. If heat is not dissipated in a timely manner, it will lead to equipment overheating and failure. Therefore, screw units are generally equipped with corresponding cooling methods, such as air cooling and circulating water cooling. Although these cooling methods achieve cooling effects, they make the heat unusable, resulting in a huge waste of energy. Furthermore, the use of circulating water cooling is prone to scaling of the heat exchanger due to poor circulating water quality, affecting heat exchange efficiency and posing a significant safety hazard.

[0003] CN219281977U discloses a waste heat recovery device for a screw air compressor, which recycles and utilizes heat, improves energy utilization, reduces energy waste, and improves practicality. However, the cooling medium is oil and the cooling medium is water, and self-circulation within the device cannot be achieved. In order to accelerate heat dissipation, multiple heat dissipation devices are provided inside the device, and the internal structure is relatively complicated. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a self-circulating cooling and heat recovery device for a natural gas screw compressor. The unit is forced to cool by adding desalted water to the inlet of the screw compressor through a water pump, and self-circulation can be achieved by relying on the pressure in the system. In addition, the heat generated during the cooling process can also be exchanged with the desalted water to achieve heat recycling.

[0005] The natural gas screw compressor self-circulation cooling and heat recovery device described in the present invention includes a water tank, which is connected to a duplex filter A through a water pump. The duplex filter A is provided with a pipeline connected to a cooler. The duplex filter A is connected to the inlet of the natural gas screw compressor. The outlet of the natural gas screw compressor is provided with a pipeline connected to the cooler. The cooler is connected to a gas-liquid separator. The lower part of the gas-liquid separator is connected to the duplex filter B. The duplex filter B is provided with a pipeline connected to the inlet of the natural gas screw compressor. The top of the gas-liquid separator is connected to two parallel coalescers. The bottoms of the two coalescers are both provided with pipelines connected to the inlet of the natural gas screw compressor. The tops of the two coalescers are both connected to a dryer, and the dryer is connected to a downstream device.

[0006] Preferably, a liquid spray switch valve is provided on the pipeline connecting the inlet of the natural gas screw compressor and the duplex filter A, and pressure difference sensing devices are provided at both ends of the duplex filter A.

[0007] Preferably, the water pump outlet is provided with a pipeline connected to the top of the water tank, and a circulation regulating valve is provided on the pipeline.

[0008] Preferably, a water tank level gauge is provided on the upper portion of the water tank, the water tank is connected to a desalted water pipeline, and a water supply regulating valve is provided on the desalted water pipeline.

[0009] Preferably, the inlet of the natural gas screw compressor is provided with a pipeline connected to an upstream device, and the pipeline connecting the outlet of the natural gas screw compressor and the cooler is provided with a temperature sensing device.

[0010] Preferably, the cooler is provided with a pipeline connected to the boiler unit, and the pipeline is provided with a refrigerant outlet valve.

[0011] Preferably, a separator level gauge is provided at the lower portion of the gas-liquid separator, a pipeline connected to the boiler unit is provided at the bottom of the gas-liquid separator, and a liquid-controlled regulating valve is provided on the pipeline.

[0012] Preferably, an outlet temperature control valve is provided on the pipeline connecting the duplex filter B and the natural gas screw compressor.

[0013] Preferably, both ends of the duplex filter A and the duplex filter B are provided with pressure differential sensing devices, and the duplex filters can be automatically switched under the control of the pressure differential instrument.

[0014] Specifically, the natural gas screw compressor self-circulating cooling and heat recovery device is as follows: before starting the natural gas screw compressor, the water tank is automatically filled or maintained at a 70% liquid level by a water supply regulating valve under program control. The water supply regulating valve is controlled by a water tank level gauge, and then the water pump is automatically started. The circulation regulating valve automatically adjusts its opening to maintain the pump outlet pressure at approximately 0.6 MPa. The cooler refrigerant outlet valve is then slowly fully opened to deliver desalted water to the downstream device. After the unit is started, the program automatically opens the liquid spray on-off valve, and the desalted water is filtered through the duplex filter A and enters the natural gas screw compressor, providing initial cooling for the unit. As the unit outlet pressure continues to rise and stabilizes, the outlet temperature control valve is controlled and adjusted by the temperature sensing device, and the desalted water returns to the natural gas screw compressor inlet to establish self-circulation. After the compressor outlet temperature stabilizes, the desalted water is controlled by the hydraulic control valve to deliver the desalted water to the downstream boiler unit. During system operation, when the pressure difference before and after the duplex filter B reaches a certain value, the system automatically switches to ensure normal water circulation.

[0015] The outlet of the natural gas screw compressor is equipped with a cooler. The natural gas from the upstream device is compressed and cooled by the natural gas screw compressor. The aftercooler performs secondary cooling on the compressed natural gas. After cooling, the natural gas enters the gas-liquid separator, where liquid / gas separation is achieved. Part of the water in the lower part of the gas-liquid separator is filtered by the double filter B based on the pressure in the tank and then returns to the inlet of the natural gas screw compressor under the control of the outlet temperature control valve, realizing self-circulation; the other part is sent to the downstream boiler unit under the control of the liquid control valve; the natural gas above the gas-liquid separator enters the two parallel coalescers through the pipeline, so that the water mist carried in the natural gas is coalesced and separated. The coalesced and separated water is returned to the inlet of the natural gas screw compressor under the action of system pressure. After being dried in the dryer, the natural gas enters the downstream device for continued use. The cold medium desalted water in the cooler absorbs the heat of the compressed natural gas and is sent to the downstream boiler unit.

[0016] Compared with the existing technology, the beneficial effects of the present invention are as follows: the natural gas screw compressor of the present invention forcibly cools the unit by replenishing desalted water to the screw compressor inlet through a water pump, and by rationally designing the connection method of each device and relying on the system's own pressure, the self-circulation of the desalted water used by the natural gas screw compressor is achieved; secondly, the heat carried by the cooler and the natural gas at the outlet of the natural gas screw compressor is utilized to achieve heat exchange of the cooling medium, thereby improving the utilization rate of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of the natural gas screw compressor self-circulating cooling and heat recovery device described in the present invention.

[0018] In the figure: 1. Natural gas screw compressor; 2. Desalted water pipeline; 3. Water tank; 4. Water tank level gauge; 5. Water supply regulating valve; 6. Water pump; 7. Circulation regulating valve; 8. Duplex filter A; 9. Pressure difference sensing device; 10. Liquid spray switch valve; 11. Upstream device; 12. Downstream device; 13. Temperature sensing device; 14. Outlet temperature control valve; 15. Cooler; 16. Duplex filter B; 17. Gas-liquid separator; 18. Separator level gauge; 19. Coalescer; 20. Dryer; 21. Refrigerant outlet valve; 22. Boiler unit; 23. Liquid control valve. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1As shown, the natural gas screw compressor self-circulation cooling and heat recovery device includes a natural gas screw compressor 1, the inlet of the natural gas screw compressor 1 is connected to the duplex filter A8, the duplex filter A8 is connected to the water tank 3 through the water pump 6, the outlet of the natural gas screw compressor 1 is provided with a pipeline connected to the cooler 15, the cooler 15 is connected to the gas-liquid separator 17, the lower part of the gas-liquid separator 17 is connected to the duplex filter B16, the duplex filter B16 is provided with a pipeline connected to the natural gas screw compressor 1, the top of the gas-liquid separator 17 is connected to two parallel coalescers 19, the bottoms of the two coalescers 19 are both provided with pipelines connected to the natural gas screw compressor 1, and the tops of the two coalescers 19 are both connected to the dryer 20.

[0021] A liquid spray switch valve 10 is provided on the pipeline connecting the inlet of the natural gas screw compressor 1 and the duplex filter A8. The duplex filter A8 is provided with a pipeline connected to the cooler 15. Pressure difference sensing devices 9 are provided at both ends of the duplex filter A8.

[0022] The outlet of the water pump 6 is provided with a pipeline connected to the top of the water tank 3, and a circulation regulating valve 7 is provided on the pipeline.

[0023] A water tank level gauge 4 is provided on the upper portion of the water tank 3 . The water tank 3 is connected to the desalted water pipeline 2 . A water supply regulating valve 5 is provided on the desalted water pipeline 2 .

[0024] The inlet of the natural gas screw compressor 1 is provided with a pipeline connected to an upstream device 11 , and the pipeline connecting the outlet of the natural gas screw compressor 1 and the cooler 15 is provided with a temperature sensing device 13 .

[0025] The cooler 15 is provided with a pipeline connected to the boiler unit 22, and a refrigerant outlet valve 21 is provided on the pipeline; the boiler unit 22 is provided with a pipeline connected to the bottom of the gas-liquid separator 17, and a liquid-controlled regulating valve 23 is provided on the pipeline.

[0026] A separator liquid level gauge 18 is provided at the lower portion of the gas-liquid separator 17 .

[0027] An outlet temperature control valve 14 is provided on the pipeline connecting the duplex filter B16 and the natural gas screw compressor 1 .

[0028] The dryer 20 is provided with a pipeline connected to the downstream device 12.

[0029] Both ends of the duplex filter A8 and the duplex filter B16 are provided with a pressure difference sensing device 9, and both can be automatically switched under the control of a pressure difference instrument.

[0030] Specifically, the natural gas screw compressor self-circulating cooling and heat recovery device, before the natural gas screw compressor 1 is started, the water tank 3 is automatically filled / maintained at 70% of the liquid level by the water supply regulating valve 5 through program control, the water supply regulating valve 5 is controlled by the water tank level gauge 4, and then the water pump 6 is automatically started, the circulation regulating valve 7 automatically adjusts the opening, maintains the pump outlet pressure at about 0.6MPa, and slowly fully opens the cooler 15 refrigerant outlet valve 21 to send desalted water to the downstream boiler unit 22; after the unit is started, the program automatically opens the liquid spray switch valve 10, and the desalted water is discharged through the double After being filtered by filter A8, the water enters the natural gas screw compressor 1, which performs preliminary cooling on the unit itself. As the outlet pressure of the unit continues to rise and stabilizes, the outlet temperature control valve 14 is controlled and adjusted by the temperature sensing device 13, and the desalted water returns to the inlet of the natural gas screw compressor 1 to establish a self-circulation. After the outlet temperature of the natural gas screw compressor 1 stabilizes, the desalted water is controlled by the hydraulic control valve 23 and sent to the downstream boiler unit 22. During system operation, when the pressure difference before and after the double filter B16 reaches a certain value, it automatically switches to ensure normal circulation of water.

[0031] The outlet of natural gas screw compressor 1 is equipped with a cooler 15. Natural gas from upstream device 11 is compressed and cooled by natural gas screw compressor 1. Aftercooler 15 performs secondary cooling on the compressed natural gas. After cooling, the natural gas enters gas-liquid separator 17, where liquid / gas separation is achieved. A portion of the water in the lower portion of gas-liquid separator 17 is filtered by a double filter B16 based on the pressure within the tank and then returned to the inlet of natural gas screw compressor 1 under the control of outlet temperature control valve 14, achieving self-circulation. The other portion is sent to the downstream boiler unit 22 under the control of a hydraulic control valve 23. The natural gas above gas-liquid separator 17 enters two parallel coalescers 19 through a pipeline, coalescing and separating the water mist carried by the natural gas. The coalesced and separated water is returned to the inlet of natural gas screw compressor 1 under the action of system pressure. The natural gas is dried in dryer 20 and then enters downstream device 12 for further use. The desalted water in cooler 15 absorbs the heat of the compressed natural gas before being sent to the downstream boiler unit 22.

Claims

1. A natural gas screw compressor self-circulating cooling and heat recovery device, characterized in that: The invention comprises a natural gas screw compressor (1), wherein the inlet of the natural gas screw compressor (1) is connected to a duplex filter A (8), the duplex filter A (8) is connected to a water tank (3) via a water pump (6), a water tank level gauge (4) is provided on the upper part of the water tank (3), the water tank (3) is connected to a desalted water pipeline (2), and a water supply regulating valve (5) is provided on the desalted water pipeline (2); the outlet of the natural gas screw compressor (1) is provided with a pipeline connected to a cooler (15), and the cooler (15) is provided with a water supply regulating valve (5) on the upper part of the water tank (3). ) is connected to a gas-liquid separator (17), the lower part of the gas-liquid separator (17) is connected to a duplex filter B (16), the duplex filter B (16) is provided with a pipeline connected to the inlet of a natural gas screw compressor (1), the top of the gas-liquid separator (17) is connected to two parallel coalescers (19), the bottoms of the two coalescers (19) are both provided with pipelines connected to the natural gas screw compressor (1), and the tops of the two coalescers (19) are both connected to a dryer (20).

2. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: A liquid spray switch valve (10) is provided on the pipeline connecting the inlet of the natural gas screw compressor (1) and the duplex filter A (8), and the duplex filter A (8) is provided with a pipeline connected to the cooler (15).

3. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: The outlet of the water pump (6) is provided with a pipeline connected to the top of the water tank (3), and a circulation regulating valve (7) is provided on the pipeline.

4. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: The inlet of the natural gas screw compressor (1) is provided with a pipeline connected to an upstream device (11), and the pipeline connecting the outlet of the natural gas screw compressor (1) and a cooler (15) is provided with a temperature sensing device (13).

5. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: The cooler (15) is provided with a pipeline connected to the boiler unit (22), and a refrigerant outlet valve (21) is provided on the pipeline; the boiler unit (22) is provided with a pipeline connected to the bottom of the gas-liquid separator (17), and a liquid-controlled regulating valve (23) is provided on the pipeline.

6. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: A separator liquid level gauge (18) is provided at the lower part of the gas-liquid separator (17).

7. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: An outlet temperature control valve (14) is provided on the pipeline connecting the duplex filter B (16) and the natural gas screw compressor (1).

8. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: The dryer (20) is provided with a pipeline connected to a downstream device (12).

9. The natural gas screw compressor self-circulating cooling and heat recovery device according to claim 1, characterized in that: Both ends of the duplex filter A (8) and the duplex filter B (16) are provided with a pressure difference sensing device (9), and the duplex filters can be automatically switched under the control of the pressure difference instrument.

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