Waste heat recycling system for air compression device

Abstract

The utility model discloses a waste heat recycling system for an air compression device. The waste heat recycling system comprises an air compression main machine, an oil-gas separator, a heat exchanger, a three-way thermostatic expansion valve and a second stop valve. A first oil inlet pipe is connected to one side of the bottom of the air compression main machine and connected with an oil-gas separator. According to the utility model, a high-temperature oil-gas mixture flowing out of the air compression main engine enters the oil-gas separator, water, gas and oil are separated by utilizing different densities of oil and water, the gas is discharged and collected through the gas valve at the top of the oil-gas separator, and the obtained air does not contain water, so that the quality of a gas source is not influenced, and factory equipment is not damaged; the separated high-temperature oil reaches the heat energy recoverer through a bypass pipeline of the three-way thermostatic expansion valve, heat of the high-temperature oil is transferred to water flowing through the heat energy recoverer through the heat exchange principle, the obtained high-temperature water is stored in the heat preservation water tank through a pipeline, heat dissipation of the air compression main machine can be facilitated, and energy waste can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of industrial production, and particularly relates to a waste heat recovery and utilization system for an air compression device. Background Art

[0002] A screw air compressor is an air compressor that increases the pressure of gas through the mechanical movement of the master and slave screws. The screw air compressor operates stably and efficiently, and can meet the requirements of compressed air in various industrial occasions. Compared with other types of air compressors, the screw air compressor has lower noise, which is beneficial to improving the working environment. Therefore, the screw air compressor is widely used in the field of industrial production and provides a reliable air source for product production in multiple fields. However, its disadvantages are also obvious. First, the compressed air generated by the screw air compressor contains a large amount of moisture. If not treated cleanly, it will affect the quality of the air source and damage the production equipment of the factory. Second, during the use of the screw air compressor, the compressed gas is released, and these heat energies are usually directly discharged into the atmosphere through the exhaust fan. This is not conducive to the heat dissipation of the air compression main unit and will also cause energy waste. Therefore, it is necessary to design a waste heat recovery and utilization system for the air compression device. Content of the Utility Model

[0003] The purpose of the utility model is to provide a waste heat recovery and utilization system for an air compression device to solve the problems that the heat energy of the existing screw air compressor is directly discharged through the exhaust fan during use and the compressed air contains a large amount of moisture.

[0004] To solve the above technical problems, the utility model provides the following technical solutions: A waste heat recovery and utilization system for an air compression device includes an air compression main unit, an oil and gas separator, a makeup water tank, a second water inlet pipe, a heat energy recovery device, a heat exchanger, and a three-way thermostatic expansion valve. One side of the bottom of the air compression main unit is connected with a first oil inlet pipe, the first oil inlet pipe is connected to the oil and gas separator, the top of the oil and gas separator is connected with a fourth oil outlet pipe, the fourth oil outlet pipe is connected to the top of the air compression main unit, one side of the bottom of the oil and gas separator is fixedly connected with the second water inlet pipe, the second water inlet pipe is connected to one side of the three-way thermostatic expansion valve, one side of the bottom of the three-way thermostatic expansion valve is connected with a third oil inlet pipe, the second water inlet pipe and the third oil inlet pipe are interconnected, the third oil inlet pipe is connected to one side of the top of the heat energy recovery device, one side of the bottom of the heat energy recovery device is connected with a first oil outlet pipe, the first oil outlet pipe is connected to the heat exchanger, one side of the top of the heat exchanger is connected with a second oil outlet pipe, the second oil outlet pipe is connected to the other side of the bottom of the three-way thermostatic expansion valve, the three-way thermostatic expansion valve is connected with a third oil outlet pipe, the second oil outlet pipe and the third oil outlet pipe are interconnected, and the third oil outlet pipe is connected to the other side of the air compression main unit.

[0005] As a further technical solution of the utility model, a first stop valve is connected to the other side of the top of the heat exchanger.

[0006] As a further technical solution of the present utility model, the other side of the top of the heat energy recovery device is connected with a first water outlet pipe.

[0007] As a further technical solution of the present utility model, the first water outlet pipe is connected to a heat preservation water tank.

[0008] As a further technical solution of the present utility model, one side of the heat preservation water tank is connected with a first water inlet pipe, and the other side of the heat preservation water tank is connected with a water intake structure.

[0009] As a further technical solution of the present utility model, the first water inlet pipe is connected to the other side of the bottom of the heat energy recovery device, a second water inlet pipe is connected to the first water inlet pipe, and a second stop valve is installed on the first water inlet pipe.

[0010] As a further technical solution of the present utility model, the second water inlet pipe is connected to a make-up water tank.

[0011] The waste heat recovery and utilization system for an air compressor device provided by the present utility model has the following advantages: The high-temperature oil-gas mixture flowing out of the air compressor host enters the oil-gas separator. By using the different densities of oil and water, water, gas and oil are separated. The gas is discharged and collected through the gas valve at the top of the oil-gas separator, and the obtained air contains no moisture, which neither affects the quality of the gas source nor damages the factory equipment; The high-temperature oil reaches the heat energy recovery device through the bypass pipeline of the three-way thermal expansion valve. Through the principle of heat exchange, the heat of the high-temperature oil is transferred to the water flowing through the heat energy recovery device, which not only helps the air compressor host to dissipate heat but also avoids waste of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a schematic diagram of the working principle of the present utility model;

[0015] In the figure: 1, air compressor main unit; 2, first oil inlet pipe; 3, second oil inlet pipe; 4, oil-gas separator; 5, third oil inlet pipe; 6, first water outlet pipe; 7, heat preservation water tank; 8, first water inlet pipe; 9, make-up water tank; 10, second water inlet pipe; 11, water intake structure; 12, heat energy recovery device; 13, first oil outlet pipe; 14, heat exchanger; 15, first stop valve; 16, second oil outlet pipe; 17, three-way thermostatic expansion valve; 18, third oil outlet pipe; 19, fourth oil outlet pipe; 20, second stop valve. Specific embodiments

[0016] 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. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components. 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 situations.

[0018] Please refer to the atta Figure 1-2, an embodiment provided by the present utility model: a waste heat recovery and utilization system for an air compressor device, including an air compressor main unit 1, an oil-gas separator 4, a water replenishing tank 9, a second water inlet pipe 10, a heat energy recovery device 12, a heat exchanger 14, and a three-way thermal expansion valve 17. One side of the bottom of the air compressor main unit 1 is connected with a first oil inlet pipe 2, and the first oil inlet pipe 2 is connected to the oil-gas separator 4. The top of the oil-gas separator 4 is connected with a fourth oil outlet pipe 19, and the fourth oil outlet pipe 19 is connected to the top of the air compressor main unit 1. One side of the bottom of the oil-gas separator 4 is fixedly connected with a second water inlet pipe 3. The second water inlet pipe 3 and a third water inlet pipe 5 are interconnected. The second water inlet pipe 3 is connected to one side of the three-way thermal expansion valve 17. One side of the bottom of the three-way thermal expansion valve 17 is connected with the third water inlet pipe 5. The third water inlet pipe 5 is connected to one side of the top of the heat energy recovery device 12. One side of the bottom of the heat energy recovery device 12 is connected with a first oil outlet pipe 13, and the first oil outlet pipe 13 is connected to the heat exchanger 14. One side of the top of the heat exchanger 14 is connected with a second oil outlet pipe 16, and the second oil outlet pipe 16 is connected to the other side of the bottom of the three-way thermal expansion valve 17. The three-way thermal expansion valve 17 is connected with a third oil outlet pipe 18. The second oil outlet pipe 16 and the third oil outlet pipe 18 are interconnected. The third oil outlet pipe 18 is connected to the other side of the air compressor main unit 1; a first stop valve 15 is connected to the other side of the top of the heat exchanger 14; a first water outlet pipe 6 is connected to the other side of the top of the heat energy recovery device 12; the first water outlet pipe 6 is connected to a heat preservation water tank 7, and the function of the heat preservation water tank 7 is to keep the temperature of warm water; one side of the heat preservation water tank 7 is connected with a first water inlet pipe 8, and a water intake structure 11 is connected to the other side of the heat preservation water tank 7; the first water inlet pipe 8 is connected to the other side of the bottom of the heat energy recovery device 12, a second water inlet pipe 10 is connected to the first water inlet pipe 8, and a second stop valve 20 is connected to the first water inlet pipe 8. When the water temperature in the heat preservation tank is lower than 55°C, the second stop valve 20 is opened, and water flows through the first water inlet pipe 8 into the heat energy recovery device 12; the second water inlet pipe 10 is connected to the water replenishing tank 9, and the water replenishing tank 9 provides cold water for heat exchange.

[0019] Specifically, during use, as shown in the attached Figure 2As shown in the figure, first, when the air compressor main unit 1 starts in a shutdown state, the temperature of the oil is relatively low and its viscosity is relatively high. When the temperature of the air compressor main unit 1 is lower than 75°C, the oil directly returns to the compression main unit 1 through the fourth oil pipe and does work without heat dissipation, causing the oil temperature to rise rapidly. When the oil temperature exceeds 75°C, the temperature control valve slowly opens, and part of the oil enters the heat energy recovery device 12 through the bypass pipeline until it is completely closed, and all the high-temperature oil enters the heat energy recovery device 12. The heat energy recovery device 12 starts to work. Cold water at 10 - 25°C flows out from the make-up water tank 9 and the heat preservation water tank 7, passes through the second water inlet pipe 10 and the first water inlet pipe 8, and flows into the heat energy recovery device 12. Through heat exchange, the heat energy of the high-temperature oil is transferred to the water, and the cold water is heated to 55 - 85°C and flows into the heat preservation water tank 7 for storage through the first water outlet pipe 6. The high-temperature oil after heat exchange flows into the heat exchanger 14 from the first oil outlet pipe 13, undergoes heat exchange again, and finally returns to the air compressor main unit 1 through the third oil outlet pipe 18. When the oil temperature slowly drops below 75°C, the temperature control valve slowly closes, and the oil temperature rises rapidly. These two situations cycle continuously until the required temperature is reached, achieving the temperature balance of the air compressor main unit and the oil. Regardless of the temperature, when the oil-gas mixture reaches the oil-gas separator 4, the water, gas, and oil are separated by using the different densities of oil and water. The gas is discharged and collected through the gas valve at the top of the oil-gas separator 4, and the obtained air contains no moisture, which neither affects the quality of the gas source nor damages the factory equipment.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" 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, and it can be the communication inside two components. 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 situations.

[0021] The device embodiments described above are merely illustrative. The units described as separation components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A waste heat recovery system for an air compressor device, comprising an air compressor main unit (1), an oil-gas separator (4), a water supply tank (9), a second water inlet pipe (10), a heat energy recovery device (12), a heat exchanger (14) and a three-way thermal expansion valve (17), characterized in that: The bottom side of the air compressor main unit (1) is connected to a first oil inlet pipe (2), the first oil inlet pipe (2) is connected to an oil-gas separator (4), the top of the oil-gas separator (4) is connected to a fourth oil outlet pipe (19), the fourth oil outlet pipe (19) is connected to the top of the air compressor main unit (1), the bottom of one side of the oil-gas separator (4) is connected to a second oil inlet pipe (3), the second oil inlet pipe (3) is connected to one side of a three-way thermal expansion valve (17), the bottom side of the three-way thermal expansion valve (17) is connected to a third oil inlet pipe (5), the second oil inlet pipe (3) and the third oil inlet pipe (5) are interconnected. The third oil inlet pipe (5) is connected to the top side of the heat energy recovery device (12), the bottom side of the heat energy recovery device (12) is connected to the first oil outlet pipe (13), the first oil outlet pipe (13) is connected to the heat exchanger (14), the top side of the heat exchanger (14) is connected to the second oil outlet pipe (16), the second oil outlet pipe (16) is connected to the other side of the bottom of the three-way thermal expansion valve (17), the three-way thermal expansion valve (17) is connected to the third oil outlet pipe (18), the second oil outlet pipe (16) and the third oil outlet pipe (18) are interconnected, and the third oil outlet pipe (18) is connected to the other side of the air compressor main unit (1).

2. The waste heat recovery system for an air compressor according to claim 1, characterized in that: The other side of the top of the heat exchanger (14) is connected to a first stop valve (15).

3. The waste heat recovery system for an air compressor according to claim 1, characterized in that: The other side of the top of the heat energy recovery device (12) is connected to a first water outlet pipe (6).

4. The waste heat recovery system for an air compressor according to claim 3 is characterized in that: The first water outlet pipe (6) is connected to the thermal insulation water tank (7).

5. The waste heat recovery system for an air compressor according to claim 4 is characterized in that: One side of the thermal insulation water tank (7) is connected to a first water inlet pipe (8), and the other side of the thermal insulation water tank (7) is connected to a water intake structure (11).

6. The waste heat recovery system for an air compressor according to claim 5, characterized in that: The first water inlet pipe (8) is connected to the other side of the bottom of the heat energy recovery device (12), the first water inlet pipe (8) is connected to the second water inlet pipe (10), and a second stop valve (20) is installed on the first water inlet pipe (8).

7. The waste heat recovery system for an air compressor according to claim 6, characterized in that: The second water inlet pipe (10) is connected to the water replenishment tank (9).

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