Cooling separator suitable for outlet gas-liquid system of oil-free liquid injection screw compressor

Abstract

A cooling separator suitable for an outlet gas-liquid system of an oil-free liquid injection screw compressor comprises an outer shell, a gas-liquid cooling module, a first gas-liquid separation module and a second gas-liquid separation module. The gas-liquid cooling module is connected with the outer shell, and a liquid storage cavity is formed between the gas-liquid cooling module and the inner wall of the outer shell; a gas-liquid mixture inlet, a cooling medium inlet and a cooling medium outlet of the gas-liquid cooling module are formed in the outer shell. The first gas-liquid separation module is arranged in the liquid storage cavity and divides the liquid storage cavity into a first sub liquid storage cavity and a second sub liquid storage cavity, and the first sub liquid storage cavity is directly communicated with the gas-liquid mixture outlet of the gas-liquid cooling module. And the second gas-liquid separation module at least partially extends into the second sub liquid storage cavity and is connected with the outer shell, and a gas outlet is formed in the top of the second gas-liquid separation module. A liquid outlet and a compressor circulating liquid outlet are formed in the positions, corresponding to the liquid storage cavity, of the outer shell. The gas-liquid separator has the functions of gas-liquid cooling, gas-liquid separation and liquid storage, and is high in integration level, small in occupied space and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to cooling and separating equipment. Background Art

[0002] The outlet gas-liquid system of the oil-free liquid-injected screw compressor usually includes a gas-liquid cooler and a gas-liquid separator. The gas-liquid cooler usually adopts a shell-and-tube heat exchanger, and the gas-liquid separator usually adopts a wire mesh demister. Since the oil-free liquid-injected screw compressor needs to introduce the liquid phase separated from the separator into the compressor inlet as a circulating liquid spray to control the compressor exhaust temperature, the gas-liquid separator also needs to have a certain liquid storage space. The existing gas-liquid cooler and gas-liquid separator are two separate devices, which occupy a large space and are not conducive to the compact layout of the compressor unit. At the same time, the consumption of steel raw materials for manufacturing two independent devices is large, and the cost is high. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a cooling separator suitable for the outlet gas-liquid system of an oil-free liquid-injection screw compressor, which has the functions of gas-liquid cooling, gas-liquid separation and liquid storage, has high integration, occupies little space and has low manufacturing cost.

[0004] The utility model provides a cooling separator suitable for an outlet gas-liquid system of an oil-free liquid-injection screw compressor, comprising an outer shell, an air-liquid cooling module, a first air-liquid separation module and a second air-liquid separation module; the air-liquid cooling module is connected to the outer shell, a liquid storage cavity is formed between the air-liquid cooling module and the inner wall of the outer shell, and an air-liquid mixture inlet, a cooling medium inlet and a cooling medium outlet of the air-liquid cooling module are respectively arranged in the outer shell; the first air-liquid separation module is arranged in the liquid storage cavity, and the liquid storage cavity is divided into a first sub-liquid storage cavity and a second sub-liquid storage cavity, the first sub-liquid storage cavity is directly connected to the air-liquid mixture outlet of the air-liquid cooling module, and the first air-liquid separation module is used for convection The gas-liquid mixture at the gas-liquid mixture outlet is subjected to gas-liquid pre-separation, and the pre-separated gas and liquid are respectively made to flow into the second sub-liquid storage chamber; the second gas-liquid separation module is connected to the outer shell, the second gas-liquid separation module at least partially extends into the second sub-liquid storage chamber, and a gas outlet is arranged on the top of the second gas-liquid separation module; the second gas-liquid separation module is used for performing secondary gas-liquid separation on the gas-liquid mixture in the second sub-liquid storage chamber, and the gas after the secondary gas-liquid separation flows out from the gas outlet; the outer shell is respectively provided with a liquid outlet and a compressor circulating liquid outlet at positions corresponding to the liquid storage chamber, and switch valves are respectively arranged at the liquid outlet and the compressor circulating liquid outlet.

[0005] The utility model has at least the following advantages:

[0006] 1. Compared with a separate gas-liquid cooler and gas-liquid separator, the cooling separator of the outlet gas-liquid system of the oil-free liquid-injection screw compressor of the utility model embodiment integrates the functions of gas-liquid cooling, gas-liquid separation and liquid storage, which not only greatly reduces the occupied space, makes the compressor system layout more compact, but also reduces the use of steel, effectively reduces the manufacturing cost, and has higher heat transfer efficiency;

[0007] 2. The cooling separator of the embodiment of the utility model adopts a two-stage combined separation of a first gas-liquid separation module and a second gas-liquid separation module, which improves the gas-liquid separation efficiency and reduces the liquid content of the outlet gas;

[0008] 3. Compared with a separate gas-liquid cooler and gas-liquid separator, the cooling separator of the embodiment of the utility model does not have a connecting pipeline between the gas-liquid cooler and the gas-liquid separator, thereby making the pipeline design of the compressor outlet gas-liquid system simpler and reducing the pressure loss, which is conducive to the integrated design of the compressor system and reduces the manufacturing cost of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the internal structure of a cooling separator suitable for an outlet gas-liquid system of an oil-free liquid-injection screw compressor according to an embodiment of the utility model is shown.

[0010] Figure 2 Shows Figure 1 Schematic cross-sectional view of .

[0011] Figure 3 Shows Figure 1 Schematic diagram of the left side (partially showing the internal structure). DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings.

[0013] Figures 1 to 3 The cooling separator for the outlet gas-liquid system of the oil-free liquid injection screw compressor according to the embodiment of the utility model is shown. Figures 1 to 3 The cooling separator suitable for the outlet gas-liquid system of the oil-free liquid-injection screw compressor comprises an outer shell 1, a gas-liquid cooling module 2, a first gas-liquid separation module 3 and a second gas-liquid separation module 4.

[0014] The gas-liquid cooling module 2 is connected to the outer shell 1. In this embodiment, the gas-liquid cooling module 2 adopts a shell and tube heat exchanger, which includes a shell 21, a tube sheet 22 and a tube bundle 23. The tube bundle 23 is connected to the tube sheet 22, and the outer surface of the tube bundle 23 is sleeved with a plurality of baffles 24. The shell 21 of the shell and tube heat exchanger 2 includes a part of the outer shell 1 and an inner baffle 211. The inner baffle 211 is located in the inner cavity 10 of the outer shell 1 and is connected to the outer shell 1. The gas-liquid mixture inlet 2a, the cooling medium inlet 2c and the cooling medium outlet 2d of the gas-liquid cooling module 2 are respectively arranged on the outer shell 1, and the gas-liquid mixture outlet 2b of the gas-liquid cooling module 2 is arranged on the inner baffle 211 (that is, located in the inner cavity 10 of the outer shell 1). The cooling medium inlet 2c and the cooling medium outlet 2d are connected to the tube bundle 23 to pass the cooling medium (such as cooling water) to cool the high-temperature gas-liquid mixture input to the gas-liquid cooling module 2.

[0015] Specifically, the shell and tube heat exchanger 2 is arranged horizontally. The inner partition 211 is arc-shaped and opens upward. The shell 21 of the shell and tube heat exchanger 2 also includes a left head 212. A section of the inner partition 211 close to the left head 212 is provided with a cylinder connection flange 213, and the cylinder connection flange 213 is connected to the left head 212 and the tube sheet 22 respectively. Figure 1 and Figure 2 Also shown are a right head 12 as a component of the outer shell 1 and a base 5 for supporting the outer shell 1 .

[0016] A liquid storage chamber 11 is formed between the gas-liquid cooling module 2 and the inner wall of the outer shell 1. The first gas-liquid separation module 3 is disposed in the liquid storage chamber 11, and the liquid storage chamber 11 is divided into a first sub-liquid storage chamber 11a and a second sub-liquid storage chamber 11b. The first sub-liquid storage chamber 11a is directly connected to the gas-liquid mixture outlet 2b of the gas-liquid cooling module 2. The first gas-liquid separation module 3 is used to pre-separate the gas-liquid mixture flowing out of the gas-liquid mixture outlet 2b, and to make the pre-separated gas and liquid flow into the second sub-liquid storage chamber 11b respectively. In the present embodiment, the first gas-liquid separation module 3 is sealed and connected to the gas-liquid cooling module 2 and the inner wall of the outer shell 1 respectively (including but not limited to welding connection). The first gas-liquid separation module 3 adopts a corrugated plate gas-liquid pre-separation device.

[0017] In this embodiment, the gas-liquid cooling module 2 is arranged at the upper part of the inner cavity of the outer shell 1, the gas-liquid mixture inlet 2a of the gas-liquid cooling module 2 is arranged at the top of the outer shell 1, and the gas-liquid mixture outlet 2b of the gas-liquid cooling module 2 is located above the first sub-liquid storage cavity 11a; the second sub-liquid storage cavity 11b is located on the side of the gas-liquid cooling module 2 and the first sub-liquid storage cavity 11a.

[0018] The second gas-liquid separation module 4 is connected to the outer shell 1, and the second gas-liquid separation module 4 at least partially extends into the second sub-liquid storage chamber 11b, and a gas outlet 40 is provided at the top of the second gas-liquid separation module 4; the second gas-liquid separation module 4 is used to perform secondary gas-liquid separation on the gas-liquid mixture in the second sub-liquid storage chamber 11b, and make the gas after the secondary gas-liquid separation flow out from the gas outlet 40. In this embodiment, the second gas-liquid separation module 4 includes an inner cylinder 41 and a wire mesh demister 42. The inner cylinder 41 is connected to the outer shell 1 (including but not limited to welding connection), the lower part of the inner cylinder 41 extends into the second sub-liquid storage chamber 11b, and communicates with the second sub-liquid storage chamber 11b, the gas outlet 40 is arranged at the top of the inner cylinder 41, and the wire mesh demister 42 is arranged in the inner cylinder 41. Further, the inner cylinder 41 includes an inner cylinder body 41a and a top cover 41b, the top cover 41b is connected to the top of the inner cylinder body 41a, and the gas outlet 40 is arranged at the top cover 41b.

[0019] The outer shell 1 is provided with a liquid outlet 13 and a compressor circulating liquid outlet 14 at positions corresponding to the liquid storage chamber 11, and a switch valve (not shown in the figure) is provided at the liquid outlet 13 and the compressor circulating liquid outlet 14. In this embodiment, the liquid outlet 13 is provided at a position corresponding to the first sub-liquid storage chamber 11a on the bottom surface of the outer shell, and the compressor circulating liquid outlet 14 is provided at a position corresponding to the second sub-liquid storage chamber 11b on the side surface of the outer shell, and the cooling medium inlet 2c and the cooling medium outlet 2d of the gas-liquid cooling module 2 are provided on the side surface of the outer shell 1.

[0020] Furthermore, the outer shell 1 is provided with a liquid level transmitter installation interface 15 at a position corresponding to the liquid storage chamber 11. The liquid level measurement signal of the liquid level transmitter can be used to control the switch valves of the liquid outlet 13 and the compressor circulating liquid outlet 14, thereby realizing the liquid level control of the liquid storage chamber 11. In addition, the outer shell 1 is also provided with a safety valve installation interface 16, a pressure gauge installation interface 17 and a thermometer installation interface 18. Optionally, the pressure gauge installation interface 17 and the thermometer installation interface 18 are both threaded interfaces.

[0021] In a specific application, the cooling separator of the utility model embodiment is installed in the outlet gas-liquid system of the oil-free liquid injection screw compressor. The functions of the three functional modules of the cooling separator are as follows: the gas-liquid cooling module 2 is used to cool the gas-liquid mixture, and the liquid storage chamber 11 as a liquid storage functional module continuously maintains a certain liquid level to meet the liquid circulation of the compressor system, ensuring that the compressor exhaust temperature does not exceed the temperature (that is, ensuring the constant compressor outlet temperature). At the same time, a corrugated plate gas-liquid pre-separation device is provided in the liquid storage chamber 11 to pre-separate the gas and liquid. The second gas-liquid separation module 4 is used as the third functional module to achieve secondary separation of gas and liquid.

[0022] Specifically, after the high-temperature gas-liquid mixture enters the gas-liquid cooling module 2 from the gas-liquid mixture inlet 2a, it flows in the heat exchange tube bundle, exchanges heat with the circulating cooling medium in the heat exchange tube during the flow, and the temperature of the gas-liquid mixture is reduced to the required temperature. The liquid flowing out from the gas-liquid mixture outlet 2b flows to the liquid storage chamber 11, maintaining the liquid level of the liquid storage chamber 11. At the same time, the corrugated plate gas-liquid pre-separation device in the liquid storage chamber 11 separates a large amount of liquid from the gas. The pre-separated gas and liquid flow into the second sub-liquid storage chamber 11b from the upper part and the lower part of the corrugated plate respectively. The gas coming out of the second sub-liquid storage chamber 11b enters the second gas-liquid separation module 4 with a small amount of droplets. The droplets gather on the wire mesh demister 42, and finally realize the secondary separation of gas and liquid under the action of surface tension and gravity. The separated gas flows out of the cooling separator through the gas outlet 40, and the separated liquid flows into the liquid storage chamber 11.

[0023] The gas flowing out of the gas outlet 40 is the medium gas after cooling and separation, and is transported to the back-end system; the liquid flowing out of the compressor circulating liquid outlet 14 and the liquid outlet 13 are all liquids after cooling and separation (if the gas is partially condensed during the cooling process, the liquid also contains gas condensate), and the compressor circulating liquid outlet needs to maintain a certain flow rate to circulate and spray into the compressor inlet to maintain the compressor exhaust temperature from overheating. When the liquid level of the cooling separator is high, the liquid is discharged through the liquid outlet 13 to ensure that the cooling separator does not overflow or even fill with liquid.

[0024] The cooling separator of the embodiment of the utility model is suitable for the outlet gas-liquid system of the oil-free liquid-injection screw compressor. Since it integrates gas-liquid cooling, liquid storage and gas-liquid separation in the same device, it can replace the existing gas-liquid cooler, gas-liquid separator and the pipeline connecting the two, reducing the footprint of the oil-free liquid-injection screw compressor unit, making its layout more compact and more integrated, while improving the heat transfer efficiency and separation efficiency and greatly reducing the manufacturing cost.

[0025] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cooling separator suitable for the outlet gas-liquid system of an oil-free liquid injection screw compressor, characterized in that: It includes an outer shell, a gas-liquid cooling module, a first gas-liquid separation module and a second gas-liquid separation module; The gas-liquid cooling module is connected to the outer shell, a liquid storage cavity is formed between the gas-liquid cooling module and the inner wall of the outer shell, and the gas-liquid mixture inlet, cooling medium inlet and cooling medium outlet of the gas-liquid cooling module are respectively arranged in the outer shell; The first gas-liquid separation module is arranged in the liquid storage chamber, and divides the liquid storage chamber into a first sub-liquid storage chamber and a second sub-liquid storage chamber, the first sub-liquid storage chamber is directly connected to the gas-liquid mixture outlet of the gas-liquid cooling module, and the first gas-liquid separation module is used to perform gas-liquid pre-separation on the gas-liquid mixture flowing out of the gas-liquid mixture outlet, and make the pre-separated gas and liquid flow into the second sub-liquid storage chamber respectively; The second gas-liquid separation module is connected to the outer shell, the second gas-liquid separation module at least partially extends into the second sub-liquid storage chamber, and a gas outlet is provided on the top of the second gas-liquid separation module; the second gas-liquid separation module is used to perform secondary gas-liquid separation on the gas-liquid mixture in the second sub-liquid storage chamber, and make the gas after the secondary gas-liquid separation flow out from the gas outlet; The outer shell is provided with a liquid outlet and a compressor circulating liquid outlet at positions corresponding to the liquid storage chamber, and switch valves are provided at the liquid outlet and the compressor circulating liquid outlet, respectively.

2. The cooling separator according to claim 1, characterized in that: The gas-liquid cooling module adopts a shell and tube heat exchanger.

3. The cooling separator according to claim 2, characterized in that: The shell of the shell and tube heat exchanger includes a part of the outer shell and an inner partition, the inner partition is arranged in the inner cavity of the outer shell and connected to the outer shell; the gas-liquid mixture outlet of the gas-liquid cooling module is arranged on the inner partition.

4. The cooling separator according to claim 1, characterized in that: The gas-liquid cooling module is arranged at the upper part of the inner cavity of the outer shell, the gas-liquid mixture inlet of the gas-liquid cooling module is arranged at the top of the outer shell, and the gas-liquid mixture outlet of the gas-liquid cooling module is located above the first sub-liquid storage cavity; The second sub-liquid storage chamber is located on the side of the air-liquid cooling module and the first sub-liquid storage chamber.

5. The cooling separator according to claim 1, characterized in that: The liquid outlet is arranged at a position on the bottom surface of the outer shell corresponding to the first sub-liquid storage cavity, the compressor circulating liquid outlet is arranged at a position on the side surface of the outer shell corresponding to the second sub-liquid storage cavity, and the cooling medium inlet and cooling medium outlet of the gas-liquid cooling module are arranged on the side surface of the outer shell.

6. The cooling separator according to claim 1, characterized in that: The first gas-liquid separation module is sealed and connected to the gas-liquid cooling module and the inner wall of the outer shell respectively.

7. The cooling separator according to claim 1, characterized in that: The first gas-liquid separation module adopts a corrugated plate gas-liquid pre-separation device.

8. The cooling separator according to claim 1, characterized in that: The second gas-liquid separation module comprises an inner cylinder and a wire mesh demister; The inner cylinder is connected to the outer cylinder, the lower part of the inner cylinder extends into the second sub-liquid storage chamber and is connected to the second sub-liquid storage chamber, the gas outlet is arranged at the top of the inner cylinder, and the wire mesh demister is arranged in the inner cylinder.

9. The cooling separator according to claim 1, characterized in that: The outer shell is provided with a liquid level transmitter installation interface at a position corresponding to the liquid storage cavity.

10. The cooling separator according to claim 1, characterized in that: The outer shell is provided with a safety valve installation interface, a pressure gauge installation interface and a thermometer installation interface.

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