Oil-gas heat exchange system

Abstract

The utility model belongs to the technical field of oil-gas heat exchange systems applied to oil injection screw type air compressors, and discloses an oil-gas heat exchange system. The oil-gas heat exchange system comprises a first heat exchange assembly, a second heat exchange assembly, an oil-gas heat exchange device and an oil-gas heat exchange device, wherein one end of the first heat exchange assembly is connected with the exhaust end of a water-draining and gas-guiding valve; the oil return pipeline is communicated with the oil-gas separator and is used for circulating the liquid oil separated by the oil-gas separator; the second heat exchange assembly is arranged on the oil return pipeline; the second heat exchange assembly exchanges heat with the first heat exchange assembly. By arranging the first heat exchange assembly and the second heat exchange assembly, heat energy is fully utilized, heat of lubricating oil which is not cooled is conducted into compressed air, the temperature of the cooled low-temperature compressed air can be increased, and the temperature requirement of using a waste heat adsorption type drying machine is met; the waste heat drying machine can regenerate the adsorbent by using the waste heat of the compressed air, so that the power consumption of the electric heater and the consumption of the finished compressed air are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-gas heat exchange systems applied to oil-injected screw air compressors, and specifically relates to an oil-gas heat exchange system. Background Art

[0002] Oil-injected screw air compressors have become the mainstream in the development of air compressors in the world today. It can be widely used in industries such as mining, machinery manufacturing, construction, textile, petrochemical, etc. To meet the manufacturing requirements of dry and clean compressed air, enterprises usually connect a desiccant dryer to the exhaust end of the oil-injected screw air compressor. However, since the exhaust temperature of the oil-injected screw air compressor is usually 40 - 50 °C, it cannot directly use a low-energy-consumption desiccant dryer such as a heat recovery adsorption dryer, and can only use high-energy-consumption equipment such as heatless, micro-heat, and blower external heat desiccant dryers, resulting in a very high overall energy consumption of the system and low actual economic efficiency.

[0003] During the process of compressing air by the oil-injected screw air compressor, a large amount of compression heat is generated. These generated heats are dissipated into the atmosphere in a direct or indirect form, without being well utilized, resulting in a large amount of energy loss. With the deepening of the awareness of energy conservation, more and more enterprises have realized that by recovering the compression heat of air and comprehensively utilizing it for production or life to save energy consumption and improve energy utilization rate is the main innovation direction.

[0004] Therefore, there is an urgent need to provide an oil-gas heat exchange system that can make the exhaust temperature higher and be adaptable to a heat recovery adsorption dryer to overcome the above problems.

[0005] In view of this, this application is specifically proposed. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the deficiency that the exhaust temperature of the oil-injected screw air compressor in the prior art is too low to absorb heat by using a low-energy-consumption heat recovery adsorption dryer. The purpose is to provide an oil-gas heat exchange system that can make the exhaust temperature higher and be adaptable to a heat recovery adsorption dryer.

[0007] To solve the above technical problem, the basic concept of the technical solution adopted by the utility model is: an oil-gas heat exchange system applied to an oil-injected screw air compressor, the oil-injected screw air compressor includes: a drain and air guide valve, an oil-gas separator, an oil cooler and an air cooler, the oil-gas separator, the air cooler and the drain and air guide valve are connected in sequence to form a gas passage for compressed air to flow; the oil-gas separator and the oil cooler are connected to form a lubricating oil passage for lubricating oil to flow, and the oil-gas heat exchange system includes:

[0008] The first heat exchange component, one end of the first heat exchange component is connected to the exhaust end of the drain and air guide valve, and the other end of the first heat exchange component is connected to the waste heat adsorption dryer;

[0009] The oil return pipeline, the oil return pipeline is communicated with the oil-gas separator and is used for circulating the liquid oil separated by the oil-gas separator;

[0010] The second heat exchange component, the second heat exchange component is arranged on the oil return pipeline; the second heat exchange component exchanges heat with the first heat exchange component and is used for heating the exhaust gas.

[0011] According to an embodiment of the present invention, wherein, the first heat exchange component is a heater and is used for heating the exhaust gas.

[0012] According to an embodiment of the present invention, wherein, the oil return pipeline includes a first oil pipe and a second oil pipe which are communicated with each other, and the first oil pipe and the second oil pipe are connected to different ends of the second heat exchange component;

[0013] The first oil pipe is connected to the oil outlet pipe of the oil-gas separator;

[0014] The second oil pipe is connected to the oil inlet of the oil cooler, and the second oil pipe injects the lubricating oil after heat exchange by the second heat exchange component into the oil cooler through the oil inlet; the oil outlet of the oil cooler is communicated with the oil-gas separator.

[0015] According to an embodiment of the present invention, wherein, the gas outlet pipe of the oil-gas separator is connected to the gas inlet of the gas cooler;

[0016] The gas outlet of the gas cooler is connected to the air inlet end of the drain and air guide valve.

[0017] According to an embodiment of the present invention, wherein, the oil-gas separator further includes a return oil pipe;

[0018] The oil outlet is connected to the return oil pipe.

[0019] According to an embodiment of the present invention, wherein, the oil outlet pipe of the oil-gas separator is connected to the second oil pipe, and a first valve body is arranged between the oil outlet pipe and the second oil pipe;

[0020] The first valve body is a normally closed valve.

[0021] According to an embodiment of the present invention, wherein, a second valve body is arranged on the first oil pipe of the oil return pipeline, and a third valve body is arranged on the second oil pipe of the oil return pipeline;

[0022] Both the second valve body and the third valve body are normally open valves.

[0023] According to an embodiment of the present utility model, the oil-injected screw air compressor further includes:

[0024] An air filter;

[0025] A compression main unit, an air inlet of the compression main unit is connected to the air filter, and an air outlet of the compression main unit is connected to the oil-gas separator.

[0026] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art:

[0027] 1) In the present utility model, by arranging the first heat exchange component and the second heat exchange component, the lubricating oil separated before cooling exchanges heat with the first heat exchange component through the second heat exchange component, and conducts the heat of the lubricating oil to the compressed air, making full use of the heat energy, so that the temperature of the cooled low-temperature compressed air can rise to about 90 °C, meeting the adaptation conditions for using the waste heat adsorption dryer. The waste heat dryer can use the waste heat of the compressed air to regenerate the adsorbent, reducing the power consumption of the electric heater and the consumption of the finished compressed air, thereby reducing the energy consumption of the subsequent treatment equipment and effectively utilizing the originally meaningless heat energy;

[0028] 2) In the present utility model, the lubricating oil entering the oil cooler has its temperature decreased after the previous heat exchange, which can effectively reduce the load of the oil cooler and has a positive significance for improving the resource utilization rate.

[0029] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0030] The accompanying drawings, as a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0031] Figure 1 It is a schematic structural diagram of an oil-gas heat exchange system in an embodiment of the present utility model.

[0032] Main element descriptions in the figure:

[0033] 1. Oil-injected screw air compressor; 11. Drain and air guide valve; 111. Exhaust end; 112. Intake end; 12. Oil-gas separator; 121. Oil outlet pipe; 122. Air outlet pipe; 123. Return oil pipe; 13. Oil cooler; 131. Oil inlet; 132. Oil outlet; 14. Air cooler; 141. Air inlet; 142. Air outlet; 15. Air filter; 16. Compression host; 161. Intake port; 162. Exhaust port; 2. First heat exchange component; 3. Oil return pipeline; 31. First oil pipe; 32. Second oil pipe; 4. Second heat exchange component; 5. First valve body; 6. Second valve body; 7. Third valve body.

[0034] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Such as Figure 1As shown in the figure, a kind of oil-gas heat exchange system of the present utility model is applied with an oil-injected screw air compressor 1, and the oil-injected screw air compressor 1 includes: a drain and air guide valve 11, an oil-gas separator 12, an oil cooler 13 and an air cooler 14. The oil-gas separator 12, the air cooler 14 and the drain and air guide valve 11 are connected in sequence to form a gas passage for compressed air to flow; the oil-gas separator 12 and the oil cooler 13 are connected to form a lubricating oil passage for lubricating oil to flow. The oil-gas heat exchange system includes:

[0039] A first heat exchange component 2, one end of the first heat exchange component 2 is connected to the exhaust end 111 of the drain and air guide valve 11, and the other end of the first heat exchange component 2 is connected to a waste heat adsorption dryer;

[0040] An oil return pipeline 3, the oil return pipeline 3 is connected to the oil-gas separator 12 and is used for circulating the liquid oil separated by the oil-gas separator 12;

[0041] A second heat exchange component 4, the second heat exchange component 4 is arranged on the oil return pipeline 3; the second heat exchange component 4 exchanges heat with the first heat exchange component 2 and is used for heating the exhaust gas.

[0042] In the present utility model, by arranging the first heat exchange component 2 and the second heat exchange component 4, the lubricating oil before cooling and separated is exchanged heat with the first heat exchange component 2 through the second heat exchange component 4, and the heat carried by the (high-temperature) lubricating oil is conducted to the compressed air in the first heat exchange component 2. By making full use of the heat energy, the temperature of the cooled low-temperature compressed air can be raised to about 90 °C, meeting the requirements for using the waste heat adsorption dryer. The waste heat adsorption dryer can use the waste heat of the compressed air to regenerate the adsorbent, reducing the power consumption of the electric heater and the meaningless consumption of the finished compressed air, thereby reducing the energy consumption of the subsequent treatment equipment.

[0043] In a specific implementation manner of this embodiment, the first heat exchange component 2 is an electric heater and is used for heating the exhaust gas.

[0044] In the present utility model, through the above arrangement, the compressed air passing through the drain and air guide valve 11 can be assisted in heating by the two heat exchange components, improving the heating effect on the compressed air.

[0045] It can be understood that in order to ensure the normal movement of the lubricating oil (and / or compressed air) in their respective passages, a pump body (not shown in the figure) is also provided in this oil-gas heat exchange system.

[0046] In a specific implementation manner of this embodiment, the first heat exchange component 2 and the second heat exchange component 4 are in contact for heat exchange.

[0047] In another specific implementation manner of this embodiment, the first heat exchange component 2 and the second heat exchange component 4 are nested structures (partially in direct contact or not in contact), indicating that compressed air flows through the tube side and lubricating oil flows through the shell side.

[0048] In a specific implementation manner of this embodiment, the drain and air guide valve 11 further includes a drain end (not marked in the figure), and the drain end discharges the condensed water (oil-water mixture) in the compressed air passing through the drain and air guide valve 11.

[0049] In a specific implementation manner of this embodiment, the oil-gas separator 12 separates oil and gas from the compressed air mixed with lubricating oil after being compressed by the compression host 16; wherein, the separated compressed air is led out to the air cooler 14 through the air outlet pipe 122 of the oil-gas separator 12, and the separated lubricating oil is led out to the second heat exchange component 4 through the oil outlet pipe 121 of the oil-gas separator 12.

[0050] In a specific implementation manner of this embodiment, the oil cooler 13 cools down the lubricating oil; the air cooler 14 cools down the compressed air.

[0051] Please refer to the attached Figure 1 , in a specific implementation manner of this embodiment, the oil return pipeline 3 includes a first oil pipe 31 and a second oil pipe 32 that are connected to each other, and the first oil pipe 31 and the second oil pipe 32 are connected to different ends of the second heat exchange component 4;

[0052] The first oil pipe 31 is connected to the oil outlet pipe 121 of the oil-gas separator 12;

[0053] The second oil pipe 32 is connected to the oil inlet 131 of the oil cooler 13, and the second oil pipe 32 injects the lubricating oil heat-exchanged by the second heat exchange component 4 into the oil cooler 13 through the oil inlet 131; the oil outlet 132 of the oil cooler 13 is communicated with the oil-gas separator 12.

[0054] In the present utility model, through the above arrangement, the lubricating oil entering the oil cooler has its temperature decreased after the previous heat exchange, and can be reduced by about 10 - 20 °C, which can effectively reduce the load of the oil cooler 13 and has a positive significance for improving resource utilization rate.

[0055] In a specific implementation manner of this embodiment, the first oil pipe 31 is connected to the oil inlet end of the second heat exchange component 4, and the second oil pipe 32 is connected to the oil outlet end of the second heat exchange component 4;

[0056] The lubricating oil flows into the second heat exchange component 4 through the first oil pipe 31 and then flows out through the second oil pipe 32.

[0057] Please refer to the appendix Figure 1 In a specific implementation manner of this embodiment, the air outlet pipe 122 of the oil-gas separator 12 is connected to the air inlet 141 of the air cooler 14;

[0058] The air outlet 142 of the air cooler 14 is connected to the air inlet end 112 of the drain and air guide valve 11.

[0059] In a specific implementation manner of this embodiment, the oil-gas separator 12 further includes a return oil pipe 123;

[0060] The oil outlet 132 is connected to the return oil pipe 123.

[0061] Please refer to the appendix Figure 1 In a specific implementation manner of this embodiment, the oil outlet pipe 121 of the oil-gas separator 12 is connected to the second oil pipe 32, and a first valve body 5 is provided between the oil outlet pipe 121 and the second oil pipe 32;

[0062] The first valve body 5 is a normally closed valve.

[0063] In the present utility model, by providing the first valve body 5, the oil outlet pipe 121 and the second oil pipe 32 are in a cut-off state, and the lubricating oil flows along the path of the oil-gas separator 12, the first oil pipe 31, the second heat exchange component 4, the second oil pipe 32, the oil cooler 13, and the oil-gas separator 12.

[0064] Please refer to the appendix Figure 1 In a specific implementation manner of this embodiment, a second valve body 6 is provided on the first oil pipe 31 of the return oil pipeline 3, and a third valve body 7 is provided on the second oil pipe 32 of the return oil pipeline 3;

[0065] Both the second valve body 6 and the third valve body 7 are normally open valves.

[0066] When pipeline maintenance is required, control the second valve body 6 and the third valve body 7 to act to cut them off, and control the first valve body 5 to act to make it conductive; the return oil pipeline 3 is cut off, and the original lubricating oil passage becomes a flow path along the oil-gas separator 12, the oil cooler 13, and the oil-gas separator 12.

[0067] In the present utility model, by providing the first valve body 5, the second valve body 6, and the third valve body 7, it is convenient for pipeline maintenance and improves the reliability and convenience of the system.

[0068] Please refer to the appendix Figure 1, in a specific implementation manner of this embodiment, the oil-injected screw air compressor 1 further includes:

[0069] An air filter 15;

[0070] A compression main unit 16, the air inlet 161 of the compression main unit 16 is connected to the air filter 15, and the air outlet 162 of the compression main unit 16 is connected to the oil-gas separator 12.

[0071] In a specific implementation manner of this embodiment, the compression main unit 16 includes screw rotors (a male rotor and a female rotor, which mesh with each other), and during the rotation process, the volume of air gradually decreases, realizing the compression of air.

[0072] Specifically, the external air (or active air supply) passing through the air filter 15 enters the compression main unit 16 through the air inlet 161 for compression, and the compressed air passes through the air outlet 162 and enters the oil-gas separator 12;

[0073] The compressed air after oil-gas separation (containing more lubricating oil) enters the air cooler 14 through the air inlet 141 via the outlet pipe 122. The compressed air after cooling (the gaseous lubricating oil becomes liquid and part of it is removed) passes through the air outlet 142 and the air inlet end 112 and enters the drain and air guiding valve 11, and then enters the first heat exchange assembly 2 through the exhaust end 111 (the compressed air is further deoiled), and then enters the waste heat adsorption dryer (not shown in the figure);

[0074] The lubricating oil after oil-gas separation (with a relatively high temperature) enters the second heat exchange assembly 4 through the oil outlet pipe 121 via the first oil pipe 31. The lubricating oil after the heat exchange process (with a relatively lower temperature) passes through the second oil pipe 32 and the oil inlet 131 and enters the oil cooler 13 (the temperature of the lubricating oil is further reduced), and then passes through the oil outlet 132 and enters the oil-gas separator 12 through the return oil pipe 123.

[0075] Applying the oil-gas heat exchange system provided by the utility model, the lubricating oil before cooling and separated is heat-exchanged with the first heat exchange assembly 2 through the second heat exchange assembly 4, and the heat of the lubricating oil is conducted to the compressed air. By making full use of the heat energy, the temperature of the low-temperature compressed air after cooling can be raised to about 90 °C, meeting the requirements for using the waste heat adsorption dryer. The waste heat adsorption dryer can use the waste heat of the compressed air to regenerate the adsorbent, reducing the power consumption of the electric heater and the consumption of the finished compressed air, thereby reducing the energy consumption of the subsequent treatment equipment.

[0076] The above are only the preferred embodiments of the present utility model, and do not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the present utility model's solution.

Claims

1. An oil-gas heat exchange system, using an oil-injected screw air compressor (1), the oil-injected screw air compressor (1) comprising: a water drainage and air guide valve (11), an oil-gas separator (12), an oil cooler (13) and an air cooler (14); the oil-gas separator (12), the air cooler (14) and the water drainage and air guide valve (11) are sequentially connected to form a gas passage for compressed air to flow; the oil-gas separator (12) and the oil cooler (13) are connected to form a lubricating oil passage for lubricating oil to flow, and the oil-gas heat exchange system comprises: A first heat exchange component (2), one end of the first heat exchange component (2) being connected to the exhaust end (111) of the drainage air guide valve (11), and the other end of the first heat exchange component (2) being connected to a waste heat adsorption dryer; an oil return pipeline (3), the oil return pipeline (3) being in communication with the oil-gas separator (12) and being used for circulating the liquid oil separated by the oil-gas separator (12); A second heat exchange component (4), wherein the second heat exchange component (4) is arranged on the oil return pipeline (3); the second heat exchange component (4) exchanges heat with the first heat exchange component (2) to increase the temperature of the exhaust gas.

2. The oil-gas heat exchange system according to claim 1, characterized in that: The first heat exchange component (2) is a heater, which is used to heat the exhaust gas.

3. The oil-gas heat exchange system according to claim 2, characterized in that: The oil return pipeline (3) comprises a first oil pipe (31) and a second oil pipe (32) which are interconnected, and the first oil pipe (31) and the second oil pipe (32) are connected to different ends of the second heat exchange component (4); The first oil pipe (31) is connected to the oil outlet pipe (121) of the oil-gas separator (12); The second oil pipe (32) is connected to the oil inlet (131) of the oil cooler (13); the second oil pipe (32) injects the lubricating oil after heat exchange in the second heat exchange component (4) into the oil cooler (13) through the oil inlet (131); the oil outlet (132) of the oil cooler (13) is in communication with the oil-gas separator (12).

4. The oil-gas heat exchange system according to claim 3, characterized in that: The air outlet pipe (122) of the oil-gas separator (12) is connected to the air inlet (141) of the air cooler (14); The air outlet (142) of the air cooler (14) is connected to the air inlet (112) of the drainage air guide valve (11).

5. The oil-gas heat exchange system according to claim 3, characterized in that: The oil-gas separator (12) further comprises an oil return pipe (123); The oil outlet (132) is connected to the return oil pipe (123).

6. The oil-gas heat exchange system according to claim 3, characterized in that: The oil outlet pipe (121) of the oil-gas separator (12) is connected to the second oil pipe (32), and a first valve body (5) is provided between the oil outlet pipe (121) and the second oil pipe (32); The first valve body (5) is a normally closed valve.

7. An oil-gas heat exchange system according to any one of claims 3 to 6, characterized in that: A second valve body (6) is provided on the first oil pipe (31) of the oil return pipeline (3), and a third valve body (7) is provided on the second oil pipe (32) of the oil return pipeline (3); The second valve body (6) and the third valve body (7) are both normally open valves.

8. The oil-gas heat exchange system according to claim 7, characterized in that: The oil-injected screw air compressor (1) further comprises: Air filter (15); A compression main unit (16), wherein an air inlet (161) of the compression main unit (16) is connected to the air filter (15), and an exhaust port (162) of the compression main unit (16) is connected to the oil-gas separator (12).

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