Waste heat recovery system of air compressor

Abstract

An air compressor waste heat recovery system comprises an air compressor which is an oil injection air compressor or an oil-free air compressor, and further comprises a first-stage heat exchanger which is provided with a first heat source channel and a first medium channel. A first heat source channel of the first-stage heat exchanger is communicated with a lubricating oil conveying system of the oil injection air compressor or an exhaust port of the oil-free air compressor, and is used for inputting an energy storage medium generated in the compression process of the air compressor; the cold end of the first medium channel is used for inputting normal-temperature water, and the hot end of the first medium channel is used for outputting hot water or saturated water vapor after heat exchange. The air compressor waste heat recovery system can recycle heat generated in the air compression process, the energy utilization rate is increased, the service life of a machine is prolonged, and the production and use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to an air compressor waste heat recovery system. BACKGROUND

[0002] The air compressor can produce a large amount of heat in the working process, and the heat of the oil-injected air compressor is mainly absorbed by the lubricating oil (i.e. the lubricating oil is the energy storage medium), and the heat generated by the oil-free air compressor mainly exists in the high-temperature and high-pressure gas at the exhaust end (i.e. the exhaust gas is the energy storage medium), and the exhaust temperature of the oil-free air compressor usually rises to hundreds of degrees Celsius. If the heat is directly discharged, it will cause waste and low energy utilization rate. On the other hand, too high temperature can also be dangerous to the machine and reduce the service life of the machine; especially for multi-stage air compressor systems, in order to ensure the normal operation of each stage air compressor, a cooling system is usually required, such as the air compressor cooling system disclosed in the Chinese utility model patent with the authorization announcement number CN215170598U; setting a cooling system for the air compressor not only cannot utilize the heat generated in the air compression process, but also increases the production and use cost.

[0003] Therefore, it is urgent to design an air compressor waste heat recovery system to recover and utilize the heat generated in the air compression process, improve the energy utilization rate and the service life of the machine, and reduce the production and use cost. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide an air compressor waste heat recovery system that can recover and utilize the heat generated in the air compression process, improve the energy utilization rate and the service life of the machine, and reduce the production and use cost.

[0005] The technical solution of the utility model is: an air compressor waste heat recovery system, comprising an air compressor, the air compressor is an oil-injected air compressor or an oil-free air compressor, further comprising a primary heat exchanger, the primary heat exchanger is provided with a first heat source channel and a first medium channel, the first heat source channel of the primary heat exchanger is communicated with the lubricating oil conveying system of the oil-injected air compressor or communicated with the exhaust port of the oil-free air compressor, for inputting the energy storage medium generated in the compression process of the air compressor, and the cold end of the first medium channel is used for inputting normal temperature water and the hot end of the first medium channel is used for outputting the heated water or saturated water vapor after heat exchange.

[0006] After adopting the above structure, the utility model has the following advantages:

[0007] The air compressor waste heat recovery system inputs the energy storage medium generated in the compression process of the air compressor into a heat exchanger, heats normal temperature water in the heat exchanger to obtain hot water or saturated water vapor, and therefore the heat generated in the compression process of the air compressor is not directly discharged, but the heat energy of the air compressor is recycled, the energy utilization rate is improved, and the air compressor waste heat recovery system has the advantages of high efficiency and energy saving.

[0008] As preferred, when the air compressor is an oil-free air compressor, the hot end of the first heat source channel of the primary heat exchanger is in communication with the exhaust port of the oil-free air compressor, for inputting the energy storage exhaust of the oil-free air compressor, and the cold end of the first heat source channel of the primary heat exchanger is used for outputting the energy storage exhaust after heat exchange and cooling. The setting structure is reasonable, the energy storage exhaust of the oil-free air compressor can be introduced through the hot end of the first heat source channel to heat the normal temperature water in the primary heat exchanger, and the energy storage exhaust after heat exchange and cooling can be obtained through the cold end of the first heat source channel.

[0009] As preferred, the air compressor waste heat recovery system further comprises a secondary heat exchanger, the secondary heat exchanger is provided with a second heat source channel and a second medium channel, the cold end of the second medium channel of the secondary heat exchanger is used for inputting the normal temperature intake air, the hot end of the second heat source channel of the secondary heat exchanger is in communication with the cold end of the first heat source channel of the primary heat exchanger, for inputting the energy storage exhaust after primary heat exchange of the primary heat exchanger, the cold end of the second heat source channel of the secondary heat exchanger is used for outputting the energy storage exhaust after secondary heat exchange of the secondary heat exchanger, and the hot end of the second medium channel of the secondary heat exchanger is in communication with the intake port of the oil-free air compressor, for outputting the intake air after heat exchange of the secondary heat exchanger. Since the energy storage exhaust discharged from the exhaust end of the oil-free air compressor may have excess heat after heating water into hot water or saturated water vapor, the excess heat is introduced into the secondary heat exchanger to further heat the intake air of the oil-free air compressor, so that the heat is not wasted, but the waste heat is stored on the compressed gas again and returned to the primary heat exchanger, and the heat generated by the oil-free air compressor can be recycled in the system, the energy utilization rate is high, and more sufficient hot water or saturated water vapor can be obtained.

[0010] As preferred, the oil-free air compressor is a water injection type oil-free air compressor, and the air compressor waste heat recovery system further comprises a water vapor separation assembly, the water vapor separation assembly is connected to the exhaust port of the oil-free air compressor, for separating the energy storage exhaust of the oil-free air compressor into water and steam.

[0011] The water-vapor separation assembly is provided with a water-vapor mixture inlet, a liquid outlet and a gas outlet, the water-vapor mixture inlet of the water-vapor separation assembly is connected with the cold end of the second heat source channel of the secondary heat exchanger, and is used for separating the water-vapor mixture discharged from the cold end of the second heat source channel to obtain pure high-pressure gas and filtered water. The water-vapor mixture is compressed by the water-injected oil-free air compressor, and the specific heat capacity of the water-vapor mixture is higher than that of pure gas, so that the water-injected oil-free air compressor can operate at a high pressure ratio and can overcome the harm caused by the excessively high exhaust temperature to the machine; since the water-injected oil-free air compressor generates a water-vapor mixture, the water-vapor mixture can be separated into pure high-pressure gas and filtered water through the water-vapor separation assembly.

[0012] As a preferred, when the air compressor is an oil-injected air compressor, the hot end of the first heat source channel of the primary heat exchanger is connected with the oil outlet of the lubricating oil delivery system of the oil-injected air compressor, and is used for inputting the energy storage lubricating oil of the oil-injected air compressor; the cold end of the first heat source channel of the primary heat exchanger is connected with the oil return port of the lubricating oil delivery system of the oil-injected air compressor, and is used for returning the energy storage lubricating oil cooled by heat exchange to the lubricating oil delivery system of the oil-injected air compressor. The setting is for the oil-injected air compressor, not only the high-temperature lubricating oil is introduced into the heat exchanger to heat the normal-temperature water, but also the lubricating oil cooled by heat exchange is returned to the lubricating oil delivery system of the oil-injected air compressor for recycling.

[0013] As a preferred, the steam chamber connected with the hot end of the first medium channel of the primary heat exchanger is further provided with a temperature detection assembly and an auxiliary heating assembly. The setting not only can store the saturated water vapor by the steam chamber, but also can further heat the saturated water vapor by the auxiliary heating assembly in the steam chamber when the temperature of the energy storage medium is insufficient to heat the ordinary water to form the saturated water vapor, so as to improve the yield of the water vapor; the generation of the saturated water vapor mainly relies on the heat generated in the compression process of the air compressor, and the auxiliary heating assembly only heats when the temperature detection assembly detects that the temperature is insufficient, so that the advantages of high efficiency and energy saving are still maintained, and the yield of the water vapor is improved.

[0014] As a preferred, the cold end of the first medium channel of the primary heat exchanger is further provided with a booster pump, and is used for inputting the normal-temperature water with pressure. Under normal circumstances, the normal-temperature water is heated to saturated water vapor with a temperature of 100℃ at most without positive pressure, and the saturated water vapor with a temperature higher than 100℃ can be obtained by increasing the water pressure through the booster pump. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a functional block diagram of the air compressor waste heat recovery system in the embodiment one;

[0016] Figure 2Functional block diagram of the air compressor waste heat recovery system in Example Two;

[0017] Figure 3 Functional block diagram of the air compressor waste heat recovery system in Example Three;

[0018] Figure 4 Functional block diagram of the air compressor waste heat recovery system in Example Four;

[0019] Figure 5 Functional block diagram of the air compressor waste heat recovery system in Example Five;

[0020] Figure 6 Functional block diagram of the air compressor waste heat recovery system in Example Six;

[0021] In the figure: 1-air compressor, 2-first stage heat exchanger, 3-first heat source channel, 4-first medium channel, 5-exhaust port of oil-free air compressor, 6-cold end of first medium channel, 7-hot end of first medium channel, 8-hot end of first heat source channel, 9-cold end of first heat source channel, 10-second stage heat exchanger, 11-second heat source channel, 12-second medium channel, 13-cold end of second medium channel, 14-hot end of second medium channel, 15-hot end of second heat source channel, 16-cold end of second heat source channel, 17-inlet of oil-free air compressor, 18-water vapor separation assembly, 19-water vapor mixing inlet, 20-liquid outlet, 21-gas outlet, 22-oil outlet, 23-oil return port, 24-steam chamber, 25-temperature detection assembly, 26-assisted heating assembly, 27-boost pump. DETAILED DESCRIPTION

[0022] The utility model will be further explained in connection with the drawings and in connection with the embodiments. EMBODIMENT

[0023] As Figure 1 shown, an air compressor waste heat recovery system, comprising an air compressor 1, in this embodiment, the air compressor 1 is an oil-free air compressor 1, further comprising a first stage heat exchanger 2, the first stage heat exchanger 2 is provided with a first heat source channel 3 and a first medium channel 4, the hot end 8 of the first heat source channel 3 of the first stage heat exchanger 2 is communicated with the exhaust port 5 of the oil-free air compressor 1, for inputting the energy storage exhaust of the oil-free air compressor 1, the cold end 9 of the first heat source channel 3 of the first stage heat exchanger 2 is used to output the energy storage exhaust after heat exchange and cooling, the cold end 6 of the first medium channel 4 is used to input normal temperature water, and the hot end 7 of the first medium channel 4 is used to output the hot water or saturated water vapor after heat exchange;The air compressor 1 and the first stage heat exchanger 2 can adopt the prior art.

[0024] The air compressor waste heat recovery system of the embodiment inputs the high-temperature exhaust gas generated in the compression process of the oil-free air compressor 1 into the heat exchanger to heat the normal-temperature water in the heat exchanger to obtain hot water or saturated water vapor, so that the heat generated in the compression process of the oil-free air compressor 1 is not directly discharged, but the heat energy of the oil-free air compressor 1 is recycled and utilized, the energy utilization rate is improved, and the advantages of high efficiency and energy saving are achieved. Secondly, not only the cooling system of the oil-free air compressor 1 is saved, but also the problem of excessively high temperature in the compression process of the oil-free air compressor 1 is solved, the service life of the machine is improved, and the production and use costs are reduced. Thirdly, the hot water or saturated water vapor is obtained by the heat exchange mode instead of the traditional electric heating mode, the production and use costs are further reduced, the economic benefits are improved, and the machine is more efficient and energy-saving.

[0025] The working principle of the air compressor waste heat recovery system of the embodiment is as follows:

[0026] When the oil-free air compressor 1 works, high-temperature and high-pressure energy storage exhaust gas is generated at the exhaust port 5, the energy storage exhaust gas is input into the first heat source channel 3 of the first heat exchanger 2, the normal-temperature water is input into the first medium channel 4 of the first heat exchanger 2, the normal-temperature water in the first medium channel 4 is heat-exchanged with the high-temperature energy storage exhaust gas in the first heat source channel 3, the heat-exchanged and cooled energy storage exhaust gas is output from the cold end 9 of the first heat source channel 3, and the heat-exchanged hot water or saturated water vapor is output from the hot end 7 of the first medium channel 4 of the first heat exchanger 2. Embodiment

[0027] As shown in Figure 2 , the other structures of the embodiment are the same as those of the first embodiment, and the difference lies in that the following technical features are additionally provided:

[0028] The air compressor waste heat recovery system further comprises a secondary heat exchanger 10, which is provided with a second heat source channel 11 and a second medium channel 12. The cold end 13 of the second medium channel 12 of the secondary heat exchanger 10 is used for inputting air at normal temperature. The hot end 15 of the second heat source channel 11 of the secondary heat exchanger 10 is connected with the cold end 9 of the first heat source channel 3 of the primary heat exchanger 2, and is used for inputting the energy storage exhaust gas which is subjected to primary heat exchange in the primary heat exchanger 2. The cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10 is used for outputting the energy storage exhaust gas which is subjected to secondary heat exchange in the secondary heat exchanger 10. The hot end 14 of the second medium channel 12 of the secondary heat exchanger 10 is connected with the air inlet 17 of the oil-free air compressor 1, and is used for outputting the air which is subjected to heat exchange in the secondary heat exchanger 10. The secondary heat exchanger 10 can be achieved by using the prior art. After the energy storage exhaust gas discharged from the air compressor 1 is heated to become hot water or saturated water vapor, the energy storage exhaust gas can still have excess heat. The excess heat is introduced into the secondary heat exchanger 10 again to further heat the air of the oil-free air compressor 1. The heat is not wasted, but the waste heat is stored on the compressed gas again with the air and is returned to the primary heat exchanger 2 again. The heat generated by the oil-free air compressor 1 is recycled in the system, the energy utilization rate is high, and more sufficient hot water or saturated water vapor can be obtained.

[0029] The working principle of the air compressor waste heat recovery system is as follows:

[0030] When the oil-free air compressor 1 works, the energy storage exhaust gas at high temperature and high pressure is generated at the air outlet 5 and is input into the first heat source channel 3 of the primary heat exchanger 2. The water at normal temperature is input into the first medium channel 4 of the primary heat exchanger 2. The water at normal temperature in the first medium channel 4 is subjected to heat exchange with the energy storage exhaust gas at high temperature in the first heat source channel 3. The energy storage exhaust gas which is subjected to heat exchange and temperature reduction is output from the cold end 9 of the first heat source channel 3. The hot water or saturated water vapor which is subjected to heat exchange is output from the hot end 7 of the first medium channel 4 of the primary heat exchanger 2. In order to fully utilize the waste heat of the energy storage exhaust gas which is subjected to heat exchange and temperature reduction, the energy storage exhaust gas which is subjected to heat exchange and temperature reduction is further input into the second heat source channel 11 of the secondary heat exchanger 10, and is subjected to heat exchange with the air at normal temperature in the second medium channel 12 of the secondary heat exchanger 10. The waste heat is stored on the compressed gas again with the air. Meanwhile, the cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10 outputs the energy storage exhaust gas which is subjected to further heat exchange and temperature reduction. At this time, the heat stored in the energy storage exhaust gas has been mostly replaced by the water at normal temperature in the primary heat exchanger 2 and the air at normal temperature in the secondary heat exchanger 10, and the heat loss is very small. Embodiment

[0031] As Figure 3As shown, an air compressor waste heat recovery system includes an air compressor 1, in this embodiment, the air compressor 1 is a water injection type oil-free air compressor 1, further includes a primary heat exchanger 2, the primary heat exchanger 2 is provided with a first heat source channel 3 and a first medium channel 4, the hot end 8 of the first heat source channel 3 of the primary heat exchanger 2 is communicated with the exhaust port 5 of the water injection type oil-free air compressor 1, for inputting the energy storage exhaust of the water injection type oil-free air compressor 1, the cold end 9 of the first heat source channel 3 of the primary heat exchanger 2 is used for outputting the energy storage exhaust after heat exchange and cooling, the cold end 6 of the first medium channel 4 is used for inputting normal temperature water, and the hot end 7 of the first medium channel 4 is used for outputting the heated water or saturated water vapor after heat exchange.

[0032] The air compressor waste heat recovery system of this embodiment inputs the high-temperature exhaust generated in the compression process of the water injection type oil-free air compressor 1 into the heat exchanger to heat the normal temperature water in the heat exchanger to obtain hot water or saturated water vapor, so the heat generated in the compression process of the water injection type oil-free air compressor 1 is not directly discharged, but the heat energy of the water injection type oil-free air compressor 1 is recycled and utilized, the energy utilization rate is improved, and the system has the advantages of high efficiency and energy saving; secondly, not only the cooling system of the water injection type oil-free air compressor 1 is saved, but also the problem of excessively high temperature in the compression process of the machine is solved, the service life of the machine is improved, and the production and use costs are reduced; thirdly, the hot water or saturated water vapor is obtained by replacing the traditional electric heating mode with the heat exchange mode, the production and use costs are further reduced, the economic benefits are improved, and the system is more energy efficient.

[0033] Further includes a secondary heat exchanger 10, the secondary heat exchanger 10 is provided with a second heat source channel 11 and a second medium channel 12, the cold end 13 of the second medium channel 12 of the secondary heat exchanger 10 is used for inputting the normal temperature intake air, the hot end 15 of the second heat source channel 11 of the secondary heat exchanger 10 is communicated with the cold end 9 of the first heat source channel 3 of the primary heat exchanger 2, for inputting the energy storage exhaust after primary heat exchange of the primary heat exchanger 2, the cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10 is used for outputting the energy storage exhaust after secondary heat exchange of the secondary heat exchanger 10, and the hot end 14 of the second medium channel 12 of the secondary heat exchanger 10 is communicated with the intake port 17 of the water injection type oil-free air compressor 1, for outputting the intake air after heat exchange of the secondary heat exchanger 10. Since the energy storage exhaust discharged from the exhaust end of the water injection type oil-free air compressor 1 may have excess heat after heating the water into hot water or saturated water vapor, the excess heat is introduced into the secondary heat exchanger 10 to further heat the intake air of the water injection type oil-free air compressor 1, so that the heat is not wasted, but the waste heat is stored on the compressed gas again with the intake air and returns to the primary heat exchanger 2 again, so that the heat generated by the water injection type oil-free air compressor 1 can always be recycled in the system, the energy utilization rate is high, and more sufficient hot water or saturated water vapor can be obtained.

[0034] The water-vapor separation assembly 18 is provided with a water-vapor mixture inlet 19, a liquid outlet 20 and a gas outlet 21. The water-vapor mixture inlet 19 of the water-vapor separation assembly 18 is connected with the cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10, and is used to separate the water-vapor mixture discharged from the cold end 16 of the second heat source channel 11 to obtain pure high-pressure gas and filtered water. The water-vapor separation assembly 18 can be obtained by using the prior art. The compressed gas is mixed with water to become a water-vapor mixture. The specific heat capacity of the water-vapor mixture is higher than that of pure gas. Therefore, the water-injected oil-free air compressor 1 can operate at a high pressure ratio and can overcome the harm caused by the excessively high exhaust temperature to the machine. Since the water-injected oil-free air compressor 1 generates a water-vapor mixture, the pure high-pressure gas and the filtered water can be separated after passing through the water-vapor separation assembly 18.

[0035] The working principle of the air compressor waste heat recovery system in the embodiment is as follows:

[0036] When the water-injected oil-free air compressor 1 is working, high-temperature and high-pressure energy storage exhaust gas is generated at the exhaust port 5. The energy storage exhaust gas is a water-vapor mixture. The energy storage exhaust gas is input into the first heat source channel 3 of the primary heat exchanger 2. The normal-temperature water is input into the first medium channel 4 of the primary heat exchanger 2. The normal-temperature water in the first medium channel 4 exchanges heat with the high-temperature energy storage exhaust gas in the first heat source channel 3. The heat-exchanged and cooled energy storage exhaust gas is output from the cold end 9 of the first heat source channel 3. The heat-exchanged hot water or saturated water vapor is output from the hot end 7 of the first medium channel 4 of the primary heat exchanger 2. In order to fully utilize the waste heat of the heat-exchanged and cooled energy storage exhaust gas, the heat-exchanged and cooled energy storage exhaust gas is further input into the second heat source channel 11 of the secondary heat exchanger 10 to exchange heat with the normal-temperature intake air in the second medium channel 12 of the secondary heat exchanger 10. The waste heat is stored on the compressed gas again with the intake air. At the same time, the cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10 outputs the further heat-exchanged and cooled energy storage exhaust gas. At this time, the heat stored in the energy storage exhaust gas has been mostly replaced by the normal-temperature water in the primary heat exchanger 2 and the normal-temperature air in the secondary heat exchanger 10, and the heat loss is very small. Since the energy storage exhaust gas is a water-vapor mixture, the cold end 16 of the second heat source channel 11 of the secondary heat exchanger 10 is connected to the water-vapor separation assembly 18 to separate the energy storage exhaust gas into pure high-pressure gas and filtered water. Embodiment

[0037] As Figure 4As shown, an air compressor waste heat recovery system includes an air compressor 1, in this embodiment, the air compressor 1 is an oil-injected air compressor 1, further includes a first heat exchanger 2, the first heat exchanger 2 is provided with a first heat source channel 3 and a first medium channel 4, the hot end 8 of the first heat source channel 3 of the first heat exchanger 2 is communicated with the oil outlet 22 of the lubricating oil delivery system of the oil-injected air compressor 1, for inputting the energy storage lubricating oil of the oil-injected air compressor 1, the cold end 9 of the first heat source channel 3 of the first heat exchanger 2 is communicated with the oil return port 23 of the lubricating oil delivery system of the oil-injected air compressor 1, for returning the energy storage lubricating oil after heat exchange and cooling to the lubricating oil delivery system of the oil-injected air compressor 1, the cold end 6 of the first medium channel 4 is used for inputting normal temperature water, and the hot end 7 of the first medium channel 4 is used for outputting hot water or saturated water vapor after heat exchange.

[0038] The air compressor waste heat recovery system of this embodiment inputs the high-temperature lubricating oil generated in the compression process of the oil-injected air compressor 1 into the heat exchanger to heat the normal temperature water in the heat exchanger to obtain hot water or saturated water vapor, so the heat generated in the compression process of the oil-injected air compressor 1 is not directly discharged, but the heat energy of the oil-injected air compressor 1 is recycled and utilized, the energy utilization rate is improved, and the advantages of high efficiency and energy saving are achieved; secondly, not only the cooling system of the oil-injected air compressor 1 is saved, but also the problem of excessively high temperature in the compression process of the oil-injected air compressor 1 is solved, the service life of the machine is improved, and the production and use costs are reduced; thirdly, the hot water or saturated water vapor is obtained by replacing the traditional electric heating mode with the heat exchange mode, the production and use costs are further reduced, the economic benefits are improved, and the machine is more efficient and energy-saving; in addition, not only the high-temperature lubricating oil is introduced into the heat exchanger to heat the normal temperature water, but also the lubricating oil after heat exchange and cooling is returned to the lubricating oil delivery system of the oil-injected air compressor 1 for recycling.

[0039] The working principle of the air compressor waste heat recovery system of this embodiment is as follows:

[0040] When the oil-injected air compressor 1 works, the temperature of the lubricating oil rises, the high-temperature lubricating oil is input into the first heat source channel 3 of the first heat exchanger 2 through the oil outlet 22 of the lubricating oil delivery system, the normal temperature water is input into the first medium channel 4 of the first heat exchanger 2, the normal temperature water in the first medium channel 4 exchanges heat with the high-temperature lubricating oil in the first heat source channel 3, the hot water or saturated water vapor is output from the hot end 7 of the first medium channel 4, and the lubricating oil after heat exchange and cooling is output from the cold end 9 of the first heat source channel 3, and the lubricating oil after heat exchange and cooling is returned to the oil-injected air compressor 1 through the oil return port 23 of the lubricating oil delivery system for recycling. Embodiment

[0041] As Figure 5As shown, the other structures in this embodiment are the same as those in Embodiment 4, except that the following technical features are added:

[0042] It also includes a steam chamber 24 connected to the hot end 7 of the first medium channel 4 of the first-stage heat exchanger 2. The steam chamber 24 is equipped with a temperature detection component 25 and an auxiliary heating component 26. The temperature detection component 25 and the auxiliary heating component 26 can be based on existing technology. This setup not only allows for the storage of saturated water vapor in the steam chamber 24, but also, when the temperature of the energy storage medium is insufficient to heat ordinary water to form saturated water vapor, it can be further heated by the auxiliary heating component 26 in the steam chamber 24 to increase the water vapor production. The generation of saturated water vapor still mainly relies on the heat generated during the compression process of the oil-injected air compressor 1. The auxiliary heating component 26 only heats the water when the temperature detection component 25 detects that the temperature is insufficient. Therefore, it still has the advantages of high efficiency and energy saving, and can also increase the water vapor production.

[0043] The working principle of the waste heat recovery system for the air compressor in this embodiment is as follows:

[0044] When the oil-injected air compressor 1 is working, the lubricating oil temperature rises. The high-temperature lubricating oil is input into the first heat source channel 3 of the first-stage heat exchanger 2 through the oil outlet 22 of the lubricating oil delivery system. Room-temperature water is input into the first medium channel 4 of the first-stage heat exchanger 2. The room-temperature water in the first medium channel 4 exchanges heat with the high-temperature lubricating oil in the first heat source channel 3. Hot water or saturated steam is output from the hot end 7 of the first medium channel 4, and the cooled lubricating oil is output from the cold end 9 of the first heat source channel 3. The cooled lubricating oil is then returned to the oil-injected air compressor 1 for recycling through the oil return port 23 of the lubricating oil delivery system. When the lubricating oil... When the temperature is too low to heat ordinary water into saturated steam, the hot end 7 of the first medium channel 4 can only produce hot water. At this time, the hot water produced by the hot end 7 of the first medium channel 4 is input into the steam chamber 24. The temperature detection component 25 in the steam chamber 24 will detect that the temperature is too low and control the auxiliary heating component 26 to work to heat the hot water into saturated steam. When the lubricating oil temperature is sufficient to heat ordinary water into saturated steam, the hot end 7 of the first medium channel 4 produces saturated steam. At this time, the saturated steam produced by the hot end 7 of the first medium channel 4 is input into the steam chamber 24 for storage, and the auxiliary heating component 26 does not work. Example

[0045] like Figure 6 As shown, the other structures in this embodiment are the same as those in Embodiment 5, except that the following technical features are added:

[0046] The cold end 6 of the first medium channel 4 of the primary heat exchanger 2 is also provided with a booster pump 27 for inputting pressurized normal temperature water; the booster pump 27 can be of the prior art. Normally, normal temperature water is heated to at most 100℃ saturated water vapor under no positive pressure, and after the water pressure is increased by the booster pump 27, saturated water vapor with a temperature higher than 100℃ can be obtained.

[0047] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as falling within the scope of the present disclosure.

[0048] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the present application, therefore equivalent changes made according to the claims of the present application still fall within the scope of the present application.

Claims

1. An air compressor waste heat recovery system comprising an air compressor (1), the air compressor (1) being an oil injected air compressor (1) or an oil free air compressor (1), characterized in that: The first heat exchanger (2) is provided with a first heat source channel (3) and a first medium channel (4), the first heat source channel (3) of the first heat exchanger (2) is communicated with the lubricating oil delivery system of the oil-injected air compressor (1) or the exhaust port (5) of the oil-free air compressor (1), for inputting the energy storage medium generated in the compression process of the air compressor (1), the cold end (6) of the first medium channel (4) is used for inputting normal temperature water, and the hot end (7) of the first medium channel (4) is used for outputting the heat-exchanged hot water or saturated water vapor.

2. The air compressor waste heat recovery system of claim 1, wherein: When the air compressor (1) is an oil-free air compressor (1), the hot end (8) of the first heat source channel (3) of the first heat exchanger (2) is communicated with the exhaust port (5) of the oil-free air compressor (1), for inputting the energy storage exhaust gas of the oil-free air compressor (1), and the cold end (9) of the first heat source channel (3) of the first heat exchanger (2) is used for outputting the energy storage exhaust gas after heat exchange and cooling.

3. The air compressor waste heat recovery system of claim 2, wherein: The second heat exchanger (10) is provided with a second heat source channel (11) and a second medium channel (12), the cold end (13) of the second medium channel (12) of the second heat exchanger (10) is used for inputting the normal temperature intake air, the hot end (15) of the second heat source channel (11) of the second heat exchanger (10) is communicated with the cold end (9) of the first heat source channel (3) of the first heat exchanger (2), for inputting the energy storage exhaust gas after the first heat exchange of the first heat exchanger (2), the cold end (16) of the second heat source channel (11) of the second heat exchanger (10) is used for outputting the energy storage exhaust gas after the second heat exchange of the second heat exchanger (10), and the hot end (14) of the second medium channel (12) of the second heat exchanger (10) is communicated with the intake port (17) of the oil-free air compressor (1), for outputting the intake air after heat exchange of the second heat exchanger (10).

4. The air compressor waste heat recovery system of claim 3, wherein: The oil-free air compressor (1) is a water-injected oil-free air compressor (1), further comprising a water vapor separation assembly (18), the water vapor separation assembly (18) is provided with a water vapor mixed inlet (19), a liquid outlet (20) and a gas outlet (21), the water vapor mixed inlet (19) of the water vapor separation assembly (18) is communicated with the cold end (16) of the second heat source channel (11) of the second heat exchanger (10), for separating the water vapor mixture discharged from the cold end (16) of the second heat source channel (11) to obtain pure high-pressure gas and filtered water.

5. The air compressor waste heat recovery system of claim 1, wherein: When the air compressor (1) is an oil-injected air compressor (1), the hot end (8) of the first heat source channel (3) of the primary heat exchanger (2) is connected to the oil outlet (22) of the lubricating oil delivery system of the oil-injected air compressor (1) for inputting the energy storage lubricating oil of the oil-injected air compressor (1), and the cold end (9) of the first heat source channel (3) of the primary heat exchanger (2) is connected to the oil return port (23) of the lubricating oil delivery system of the oil-injected air compressor (1) for returning the energy storage lubricating oil after heat exchange and cooling to the lubricating oil delivery system of the oil-injected air compressor (1).

6. The air compressor waste heat recovery system of claim 1, wherein: Further comprising a steam chamber (24) connected to the hot end (7) of the first medium channel (4) of the primary heat exchanger (2), wherein the steam chamber (24) is provided with a temperature detection assembly (25) and an auxiliary heating assembly (26).

7. The air compressor waste heat recovery system of claim 1, wherein: The cold end (6) of the first medium channel (4) of the primary heat exchanger (2) is further provided with a booster pump (27) for inputting pressurized normal temperature water.

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