Waste heat recovery device of air compressor
By introducing a water-cooling system into the air compressor to facilitate heat exchange between oil and air, the problems of high-temperature shutdown and energy loss in screw air compressors are solved, achieving heat recovery and utilization and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-28
- Publication Date
- 2026-03-27
AI Technical Summary
Existing screw air compressors are prone to shutdown in high-temperature environments, resulting in significant energy losses. Furthermore, the high temperature of the compressed air places a heavy burden on the subsequent dryer. Current cooling methods are inefficient, leaving heat trapped indoors.
The waste heat recovery device for an air compressor using water cooling exchange heat between cooling oil and compressed air through a first heat exchanger. After cooling, the cooling water is used to heat the air in a second heat exchanger, and the heated air is then transported to the waste heat utilization component through an air conveying component to achieve heat energy recovery.
It effectively reduces the temperature of the air compressor, avoids high-temperature shutdown, extends equipment life, reduces dryer energy consumption, realizes heat energy recovery and utilization, and saves energy.
Smart Images
Figure CN121739779A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of air compressor technology, and in particular to an air compressor waste heat recovery device. Background Technology
[0002] The screw air compressor operates primarily by utilizing a pair of parallel, meshing male and female screws rotating within the compressor body. It completes the intake, compression, and exhaust processes by periodically changing the volume between each pair of meshing points. Its structure typically consists of a casing, male and female screw rotors, bearings, shaft seals, a cooling system, and a lubrication system. A significant amount of heat is lost through oil circulation and compressed air. Current coolers are air-cooled, with the heat exchanger connected to both the oil inlet and outlet and the compressed air inlet and outlet. A fan circulates air to the heat exchanger for cooling. In summer, when ambient temperatures are high, the combined heat from the air compressor's operation creates a vicious cycle, easily leading to high-temperature shutdown of the air compressor. Furthermore, the high temperature of the compressed air increases the burden on the subsequent dryer, resulting in greater energy loss. Summary of the Invention
[0003] To address the above technical problems, this invention provides an air compressor waste heat recovery device, which avoids high-temperature shutdown of the air compressor, reduces the energy consumption of the dryer, and enables heat recovery and utilization, thus saving energy.
[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a waste heat recovery device for an air compressor, comprising an air compressor, a first heat exchanger, a compressed air storage component, a dryer, a second heat exchanger, a waste heat utilization component, and an air conveying component. The oil inlet of the first heat exchanger is connected to the oil outlet of the air compressor, and the oil outlet of the first heat exchanger is connected to the oil inlet of the air compressor. The compressed air inlet of the first heat exchanger is connected to the compressed air outlet of the air compressor. The compressed air outlet of the first heat exchanger is connected to one end of the compressed air storage component, and the other end of the compressed air storage component is connected to one end of the dryer. The cooling water inlet of the first heat exchanger is used to introduce cooling water, and the cooling water outlet of the first heat exchanger is connected to the high-temperature medium inlet of the second heat exchanger. The air conveying component is used to convey the air heated by heat exchange with the second heat exchanger to the waste heat utilization component.
[0005] Preferably, the waste heat utilization component is a boiler, the air conveying component is a secondary air fan, the secondary air fan is located on one side of the air outlet of the second heat exchanger, and the boiler is located on the side of the secondary air fan away from the second heat exchanger.
[0006] Preferably, the oil inlet of the first heat exchanger is connected to the oil outlet of the air compressor via a first oil connection pipe, and the oil outlet of the first heat exchanger is connected to the oil inlet of the air compressor via a second oil connection pipe.
[0007] Preferably, the compressed air inlet of the first heat exchanger is connected to the compressed air outlet of the air compressor via a first air connection pipe, and the compressed air outlet of the first heat exchanger is connected to one end of the compressed air storage component via a second air connection pipe.
[0008] Preferably, the other end of the compressed air storage component is connected to one end of the dryer via a third air connection pipe, and the other end of the dryer is connected to the compressed air discharge pipe.
[0009] Preferably, the cooling water inlet of the first heat exchanger is connected to a cooling water inlet pipe, and the cooling water outlet of the first heat exchanger is connected to the high-temperature medium inlet of the second heat exchanger via a water connection pipe.
[0010] Preferably, the high-temperature medium outlet of the second heat exchanger is connected to the water discharge pipe.
[0011] Preferably, the oil inlet and oil outlet of the first heat exchanger are respectively located at the upper and lower ends of the middle part of the first heat exchanger, the cooling water inlet and cooling water outlet of the first heat exchanger are respectively located at the upper and lower ends of the left side of the first heat exchanger, and the compressed air outlet and compressed air inlet of the first heat exchanger are respectively located at the left and right ends of the first heat exchanger.
[0012] Preferably, the high-temperature medium inlet and high-temperature medium outlet of the second heat exchanger are respectively located at the upper and lower ends of the second heat exchanger, and the air outlet and air inlet of the second heat exchanger are respectively located at the left and right ends of the second heat exchanger.
[0013] Preferably, the compressed air storage component is a compressed air storage tank.
[0014] The present invention achieves the following technical effects compared to the prior art: The waste heat recovery device for an air compressor of the present invention includes an air compressor, a first heat exchanger, a compressed air storage component, a dryer, a second heat exchanger, a waste heat utilization component, and an air conveying component. The cooling water inlet of the first heat exchanger is used to introduce cooling water. In this invention, the cooling oil and compressed air of the air compressor are introduced into the first heat exchanger to exchange heat with the cooling water, achieving the effects of water heating, oil cooling, and compressed air cooling, thus reducing the energy consumption of the dryer in the compressed air system. The heated cooling water then heats the air through the second heat exchanger. The air conveying component transports the heated air, after heat exchange with the second heat exchanger, to the waste heat utilization component, achieving heat recovery and energy saving. Compared with air cooling, water cooling is more efficient, the generated heat is not retained indoors, has less impact on indoor temperature, avoids high-temperature shutdown of the air compressor, extends the service life of the dryer and other supporting facilities, effectively reduces the temperature of the compressed air, reduces the energy consumption of the dryer, and achieves heat recovery and utilization, saving energy. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the waste heat recovery device for an air compressor provided by the present invention.
[0017] Explanation of reference numerals in the attached drawings: 1. Air compressor; 2. First heat exchanger; 3. Compressed air storage tank; 4. Dryer; 5. Second heat exchanger; 6. Secondary air fan; 7. Boiler; 8. First oil connection pipe; 9. Second oil connection pipe; 10. First air connection pipe; 11. Second air connection pipe; 12. Third air connection pipe; 13. Compressed air discharge pipe; 14. Cooling water inlet pipe; 15. Water connection pipe; 16. Water discharge pipe. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] The purpose of this invention is to provide an air compressor waste heat recovery device to avoid high temperature shutdown of the air compressor, reduce the energy consumption of the dryer, and realize heat energy recovery and utilization, thus saving energy.
[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] like Figure 1 As shown, this embodiment provides an air compressor waste heat recovery device, including an air compressor 1, a first heat exchanger 2, a compressed air storage component, a dryer 4, a second heat exchanger 5, a waste heat utilization component, and an air conveying component. The oil inlet of the first heat exchanger 2 is connected to the oil outlet of the air compressor 1, the oil outlet of the first heat exchanger 2 is connected to the oil inlet of the air compressor 1, the compressed air inlet of the first heat exchanger 2 is connected to the compressed air outlet of the air compressor 1, the compressed air outlet of the first heat exchanger 2 is connected to one end of the compressed air storage component, the other end of the compressed air storage component is connected to one end of the dryer 4, the cooling water inlet of the first heat exchanger 2 is used to introduce cooling water, the cooling water outlet of the first heat exchanger 2 is connected to the high-temperature medium inlet of the second heat exchanger 5, and the air conveying component is used to convey the air heated by heat exchange with the second heat exchanger 5 to the waste heat utilization component.
[0022] In this embodiment, the cooling oil and compressed air of the air compressor 1 are introduced into the first heat exchanger 2 to exchange heat with the cooling water, so as to achieve the effects of water heating, oil cooling and compressed air cooling, thereby reducing the energy consumption of the dryer 4 of the compressed air system. The heated cooling water is used to heat the air through the second heat exchanger 5. The air conveying component delivers the heated air after heat exchange with the second heat exchanger 5 to the waste heat utilization component, which can realize heat recovery and achieve the purpose of saving energy.
[0023] Compared with air cooling, water cooling is more efficient. The heat generated will not remain indoors, and it has less impact on the indoor temperature. This avoids the air compressor 1 from shutting down due to high temperature, extends the service life of the dryer 4 and other supporting facilities, effectively reduces the temperature of compressed air, reduces the energy consumption of the dryer 4, and enables heat recovery and utilization, thus saving energy.
[0024] In this specific embodiment, the waste heat utilization component is a boiler 7, the air conveying component is a secondary air fan 6, the secondary air fan 6 is located on one side of the air outlet of the second heat exchanger 5, and the boiler 7 is located on the side of the secondary air fan 6 away from the second heat exchanger 5.
[0025] Specifically, the oil inlet of the first heat exchanger 2 is connected to the oil outlet of the air compressor 1 through the first oil connecting pipe 8, and the oil outlet of the first heat exchanger 2 is connected to the oil inlet of the air compressor 1 through the second oil connecting pipe 9.
[0026] Specifically, the compressed air inlet of the first heat exchanger 2 is connected to the compressed air outlet of the air compressor 1 through the first air connection pipe 10, and the compressed air outlet of the first heat exchanger 2 is connected to one end of the compressed air storage component through the second air connection pipe 11.
[0027] Specifically, the other end of the compressed air storage component is connected to one end of the dryer 4 via a third air connection pipe 12, and the other end of the dryer 4 is connected to the compressed air discharge pipe 13.
[0028] Specifically, the cooling water inlet of the first heat exchanger 2 is connected to the cooling water inlet pipe 14, and the cooling water outlet of the first heat exchanger 2 is connected to the high-temperature medium inlet of the second heat exchanger 5 through the water connection pipe 15. The cooling water inlet pipe 14 is connected to the existing circulating cooling water system in the plant to allow cooling water to be supplied to the first heat exchanger 2.
[0029] Specifically, the high-temperature medium outlet of the second heat exchanger 5 is connected to the water discharge pipe 16.
[0030] In this specific embodiment, the oil inlet and oil outlet of the first heat exchanger 2 are respectively located at the upper and lower ends of the middle part of the first heat exchanger 2, the cooling water inlet and cooling water outlet of the first heat exchanger 2 are respectively located at the upper and lower ends of the left side of the first heat exchanger 2, and the compressed air outlet and compressed air inlet of the first heat exchanger 2 are respectively located at the left and right ends of the first heat exchanger 2.
[0031] In this specific embodiment, the high-temperature medium inlet and high-temperature medium outlet of the second heat exchanger 5 are respectively located at the upper and lower ends of the second heat exchanger 5, and the air outlet and air inlet of the second heat exchanger 5 are respectively located at the left and right ends of the second heat exchanger 5.
[0032] In this specific embodiment, the compressed air storage component is a compressed air storage tank 3.
[0033] During operation, cooling water enters the first heat exchanger 2 through the cooling water inlet pipe 14. Compressed air from the air compressor 1 enters the first heat exchanger 2 through the first air connection pipe 10 and is cooled by the cooling water. Then, it enters the compressed air storage tank 3 through the second air connection pipe 11 and then enters the dryer 4 through the third air connection pipe 12. The compressed air dried by the dryer 4 is discharged through the compressed air discharge pipe 13.
[0034] The cooling oil of air compressor 1 enters the first heat exchanger 2 through the first oil connection pipe 8, is cooled by cooling water, and then returns to air compressor 1 through the second oil connection pipe 9. The cooling water in the first heat exchanger 2 cools the cooling oil and compressed air of air compressor 1, thereby heating the water. The heated cooling water enters the second heat exchanger 5 through the water connection pipe 15. Using the secondary fan 6, air enters the second heat exchanger 5 through the air inlet and exchanges heat with the heated cooling water in the second heat exchanger 5, thereby raising the temperature of the air and lowering the temperature of the water. The cooled water is discharged through the water discharge pipe 16, and the heated air enters the boiler 7 under the action of the secondary fan 6. By utilizing the heat from the heated cooling water discharged from the first heat exchanger 2, the temperature of the secondary air inlet is increased, which is beneficial to the combustion in the boiler 7, realizing heat recovery and achieving the goal of saving energy.
[0035] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A waste heat recovery device for an air compressor, characterized in that, The system includes an air compressor, a first heat exchanger, a compressed air storage component, a dryer, a second heat exchanger, a waste heat recovery component, and an air delivery component. The oil inlet of the first heat exchanger is connected to the oil outlet of the air compressor, and the oil outlet of the first heat exchanger is connected to the oil inlet of the air compressor. The compressed air inlet of the first heat exchanger is connected to the compressed air outlet of the air compressor. The compressed air outlet of the first heat exchanger is connected to one end of the compressed air storage component, and the other end of the compressed air storage component is connected to one end of the dryer. The cooling water inlet of the first heat exchanger is used to introduce cooling water, and the cooling water outlet of the first heat exchanger is connected to the high-temperature medium inlet of the second heat exchanger. The air delivery component is used to deliver the air, which has been heated by heat exchange with the second heat exchanger, to the waste heat recovery component.
2. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The waste heat utilization component is a boiler, and the air conveying component is a secondary air fan. The secondary air fan is located on one side of the air outlet of the second heat exchanger, and the boiler is located on the side of the secondary air fan away from the second heat exchanger.
3. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The oil inlet of the first heat exchanger is connected to the oil outlet of the air compressor via a first oil connection pipe, and the oil outlet of the first heat exchanger is connected to the oil inlet of the air compressor via a second oil connection pipe.
4. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The compressed air inlet of the first heat exchanger is connected to the compressed air outlet of the air compressor through a first air connection pipe, and the compressed air outlet of the first heat exchanger is connected to one end of the compressed air storage component through a second air connection pipe.
5. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The other end of the compressed air storage component is connected to one end of the dryer via a third air connection pipe, and the other end of the dryer is connected to the compressed air discharge pipe.
6. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The cooling water inlet of the first heat exchanger is connected to the cooling water inlet pipe, and the cooling water outlet of the first heat exchanger is connected to the high-temperature medium inlet of the second heat exchanger through a water connection pipe.
7. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The high-temperature medium outlet of the second heat exchanger is connected to the water discharge pipe.
8. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The oil inlet and oil outlet of the first heat exchanger are respectively located at the upper and lower ends of the middle part of the first heat exchanger, the cooling water inlet and cooling water outlet of the first heat exchanger are respectively located at the upper and lower ends of the left side of the first heat exchanger, and the compressed air outlet and compressed air inlet of the first heat exchanger are respectively located at the left and right ends of the first heat exchanger.
9. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The high-temperature medium inlet and high-temperature medium outlet of the second heat exchanger are respectively located at the upper and lower ends of the second heat exchanger, and the air outlet and air inlet of the second heat exchanger are respectively located at the left and right ends of the second heat exchanger.
10. The waste heat recovery device for an air compressor according to claim 1, characterized in that, The compressed air storage component is a compressed air storage tank.