CN212250386U - Oilless air compressor warm water recovery system - Google Patents
Oilless air compressor warm water recovery system Download PDFInfo
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- CN212250386U CN212250386U CN202020574387.2U CN202020574387U CN212250386U CN 212250386 U CN212250386 U CN 212250386U CN 202020574387 U CN202020574387 U CN 202020574387U CN 212250386 U CN212250386 U CN 212250386U
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Abstract
The utility model relates to an oil-free air compressor warm water recovery system, including cooling water system and the heat recovery system who is connected with cooling water system, cooling water can circulate between cooling water system and heat recovery system, and cooling water system includes the intensification circuit and with the parallelly connected cooling circuit of intensification circuit, and the intensification circuit is including the one-level compressor, second grade compressor and the intercooler of establishing ties in proper order. The first-stage compressor is connected with a water inlet of the cooling water system, and the intercooler is connected with a water outlet of the cooling water system. Compared with three cooling water lines connected in parallel, the two cooling water lines are arranged, so that heat loss is effectively reduced, heat exchange efficiency is improved, and the outlet water temperature meets the requirements of customers.
Description
Technical Field
The utility model belongs to the technical field of compressor cooling water technique and specifically relates to an oil-free air compressor warm water recovery system is related to.
Background
At present, the energy consumption of the air compressor accounts for 10% -35% of the total energy consumption, so the waste heat recovery of the air compressor is also gradually considered. For the oil-free screw air compressor, due to the fact that the cooling effect of oil is avoided, the compression process is closer to adiabatic compression, most of power is converted into compression heat of compressed air, and the reason is that the exhaust temperature of the oil-free screw air compressor is too high. In general, the temperature of the air compressor is lowered by introducing circulating cooling water.
In the prior art, a cooling water system in a heat recovery system of an air compressor is divided into three branches connected in parallel, a second-stage compressor is connected with an intercooler in series on a first branch, an oil cooler is connected with a first-stage compressor in series on a second branch, a third branch is an aftercooler, and a flow switch is arranged on one side of the aftercooler. And a water inlet of the cooling water system is respectively connected with the secondary compressor, the oil cooler and the aftercooler, and a water outlet of the cooling water system is respectively connected with the intercooler, the primary compressor and the flow switch. The temperature of the cooling water rises after heat exchange with the air compressor, and the cooling water is introduced into the cooler again to exchange heat, so that the produced hot water reaches the specified temperature and meets the standard of cooling water heat recovery.
The above prior art solutions have the following drawbacks: when a compressor of a common machine type is cooled, cooling water with the temperature lower than 35 ℃ is introduced into three parallel branches through a water inlet and exchanges heat with the inside of the air compressor respectively, and then the temperature in the compressor is effectively reduced. Under the action of the cooler, the cooling water of the three branches is converged at the water outlet, and the water outlet temperature can only reach about 50-60 ℃ due to the large heat loss ratio. In practical situations, customers who need to recover the heat of cooling water require that the inlet water temperature is 38 ℃ and the outlet water temperature is about 80 ℃, so the cooling system cannot meet the requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can reduce heat loss's oil-free air compressor machine heat recovery system to the not enough of prior art existence.
An oil-free air compressor warm water recovery system comprises a cooling water system and a heat recovery system connected with the cooling water system, wherein cooling water can circulate between the cooling water system and the heat recovery system, the cooling water system comprises a temperature rising line and a cooling line connected with the temperature rising line in parallel, and the temperature rising line comprises a primary compressor, a secondary compressor and an intercooler which are sequentially connected in series;
the primary compressor is connected with a water inlet of the cooling water system, and the intercooler is connected with a water outlet of the cooling water system.
According to the technical scheme, water with the temperature of 38 ℃ is introduced into a water inlet of a cooling system, cooling water is circulated in two lines, after heat exchange is carried out on part of cooling water through a primary compressor, the water temperature reaches 50-60 ℃, heat exchange is carried out through a secondary compressor, the water temperature reaches 110-170 ℃, and at the moment, hot water passes through an intercooler. Meanwhile, the temperature of the other part of cooling water is reduced to be lower than 38 ℃ after passing through the cooling circuit, the temperature of the outlet water is about 80 ℃ after the cooling circuit is mixed and reacted with the water with different temperatures in the heating circuit, and compared with three cooling water circuits connected in parallel, the two cooling water circuits are arranged, so that the heat loss is effectively reduced, the heat exchange efficiency is improved, and the outlet water temperature meets the requirements of customers.
The present invention may be further configured in a preferred embodiment as: the cooling circuit comprises an oil cooler and an aftercooler which are sequentially connected in series, the oil cooler is connected with a water inlet of the cooling water system, and the aftercooler is connected with a water outlet of the cooling water system.
Through the technical scheme, water with the temperature of 38 ℃ is sequentially introduced into the oil cooler and the after cooler, the outlet water temperature is lower than 38 ℃, and then the outlet water temperature is mixed with hot water of the temperature rising line, so that the temperature of the water generated by the temperature rising line is reduced and then reaches 80 ℃.
The present invention may be further configured in a preferred embodiment as: and a flow switch is arranged between the rear cooler and a water outlet of the cooling water system.
Through the technical scheme, the water flow in the cooling circuit can be adjusted according to the flow switch, so that the water outlet temperature of the cooling water system can be adjusted, and cooling water can meet different heat recovery customers.
The present invention may be further configured in a preferred embodiment as: and a flow regulating valve is arranged on a water inlet of the cooling water system.
Through above-mentioned technical scheme, but use flow control valve directly to set for the flow according to the design, the valve can be under the water effect, and the flow deviation that the surplus pressure head and the pressure fluctuation of elimination pipeline arouse automatically. The set flow is kept unchanged no matter how the system pressure changes, the functions of the valve enable the flow regulation of the pipe network to be completed at one time, the work of regulating the network is changed into simple flow distribution, and the hydraulic imbalance of the pipe network is effectively solved.
The present invention may be further configured in a preferred embodiment as: the heat recovery system comprises a water storage tower, a water tank and a water pump for driving the cooling water to circulate, the water pump is arranged between the water tank and a water inlet of the cooling water system, and the water storage tower is arranged between the water tank and a water outlet of the cooling water system;
and a water outlet of the cooling water system is provided with a three-way proportional valve, and the three-way proportional valve is respectively connected with the water storage tower, the water tank and a water outlet of the intercooler.
Through above-mentioned technical scheme, turn on the water pump and make the rivers in the water tank flow into cooling water system, water lets in the aqua storage tower after taking place heat exchange with the compressor, has realized thermal recycle. After the water storage tower is filled with water, the switch leading to the three-way proportional valve of the water tank can be opened, and the other two switches are closed, so that the water is recycled into the water tank. When the outlet water temperature of the cooling water system is higher than 80 ℃, the switch of the three-way proportional valve communicated with the water outlet of the intercooler is opened, so that the water exchanges heat again, and the outlet water temperature is ensured to be 80 ℃.
The present invention may be further configured in a preferred embodiment as: a secondary cooling water heat exchanger is arranged between the three-way proportional valve and the water tank, an expansion tank is arranged in the heat recovery system, and the water pump is communicated with the expansion tank through the secondary cooling water heat exchanger;
two ends of the secondary cooling water heat exchanger are respectively provided with a two-way regulating valve and a first one-way valve, the two-way regulating valve is connected with the water pump, and the first one-way valve is connected with the expansion tank.
Through the technical scheme, the temperature of the recovered water can be further reduced through the secondary cooling water heat exchanger, and the water temperature of the cooling water system can be increased to 38 ℃ so as to meet the requirement. If the temperature of the water in the water tank is lower than 38 ℃, one switch of the two-way regulating valve can be closed, so that the water is introduced into the secondary cooling water heat exchanger, and the temperature requirement of the inlet water is met after heat exchange. If the temperature of the water in the water tank is higher than or equal to 38 ℃, the switch of the two-way regulating valve communicated with the secondary cooling water heat exchanger can be closed, so that the water in the water tank is directly communicated into the first one-way valve through the water pump to be expanded in the expansion tank.
The present invention may be further configured in a preferred embodiment as: two circulating pumps which are connected in parallel are arranged between the expansion tank and the water inlet of the cooling water system, one side of each circulating pump is connected with a second one-way valve, and one end, far away from the circulating pump, of each second one-way valve is provided with a pressure sensor.
Through above-mentioned technical scheme, when the external pressurized water got into in the expansion tank gasbag, sealed nitrogen gas in the jar was compressed, according to the gaseous law of boyle, gaseous volume diminishing pressure after receiving the compression risees, stops into water when the pressure of gas pressure and water in the expansion tank reaches unanimity. When the water loss pressure is reduced, the gas pressure in the expansion tank is greater than the water pressure, and the gas is expanded to extrude the water in the air bag to the system. Through setting up two circulating pumps and two check valves, can adjust the velocity of flow and the pressure of the water in the heat recovery system, can be accurate through pressure sensor sees the pressure of pipeline water.
The present invention may be further configured in a preferred embodiment as: and a safety valve and a vent valve are arranged between the pressure sensor and a water inlet of the cooling water system.
Through the technical scheme, the safety valve plays a safety protection role in the system. When the pressure of the system exceeds a specified value, the safety valve is opened, and a part of liquid in the system is discharged to the outside, so that the pressure of the system does not exceed an allowable value, and the system is prevented from accidents caused by overhigh pressure. The atmospheric valve can noise reduction and vibration to a certain extent, has improved the stability of work.
To sum up, the utility model discloses a following at least one useful technological effect:
1. introducing water with the temperature of 38 ℃ into a water inlet of a cooling system, dividing cooling water into two lines for circulation, performing heat exchange on part of the cooling water by a primary compressor until the water temperature reaches 50-60 ℃, performing heat exchange by a secondary compressor until the water temperature reaches 110-170 ℃, and then enabling the hot water to pass through an intercooler. Meanwhile, the temperature of the other part of cooling water is reduced to be lower than 38 ℃ after passing through the cooling circuit, the temperature of the outlet water is about 80 ℃ after the cooling circuit is mixed and reacted with the water with different temperatures in the heating circuit, and compared with three cooling water circuits connected in parallel, the two cooling water circuits are arranged, so that the heat loss is effectively reduced, the heat exchange efficiency is improved, and the outlet water temperature meets the requirements of customers.
2. The water flow in the cooling circuit can be adjusted according to the flow switch, so that the outlet water temperature of the cooling water system can be adjusted, and the cooling water can meet the requirements of different heat recovery customers.
3. And the water pump is started to enable water in the water tank to flow into the cooling water system, and the water is introduced into the water storage tower after heat exchange with the compressor, so that heat is recycled. After the water storage tower is filled with water, the switch leading to the three-way proportional valve of the water tank can be opened, and the other two switches are closed, so that the water is recycled into the water tank. When the outlet water temperature of the cooling water system is higher than 80 ℃, the switch of the three-way proportional valve communicated with the water outlet of the intercooler is opened, so that the water exchanges heat again, and the outlet water temperature is ensured to be 80 ℃.
Drawings
Fig. 1 is a schematic flow chart of the water circulation of the present invention.
Reference numerals: 1. a cooling water system; 111. a first stage compressor; 112. a secondary compressor; 113. an intercooler; 121. an oil cooler; 122. an aftercooler; 123. a flow switch; 13. a flow regulating valve; 2. a heat recovery system; 21. a water storage tower; 22. a water tank; 23. a water pump; 24. a three-way proportional valve; 25. a secondary cooling water heat exchanger; 26. an expansion tank; 27. a two-way regulating valve; 28. a first check valve; 29. a circulation pump; 30. a second one-way valve; 31. a pressure sensor; 32. a safety valve; 33. and (4) an emptying valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses an oil-free air compressor warm water recovery system, including cooling water system 1 and the heat recovery system 2 of being connected with cooling water system 1, the cooling water can circulate between cooling water system 1 and heat recovery system 2. The cooling water system 1 includes a temperature-raising line including a primary compressor 111, a secondary compressor 112, and an intercooler 113 connected in series in this order, and a cooling line connected in parallel to the temperature-raising line. The primary compressor 111 is connected to a water inlet of the cooling water system 1, and the intercooler 113 is connected to a water outlet of the cooling water system 1. In the embodiment, the work efficiency of the first-stage compressor is 2.2kw/h, the work efficiency of the second-stage compressor is 7.8kw/h, and the heat generated by the second-stage compressor is greater than the heat generated by the first-stage compressor.
Wherein, the cooling circuit includes oil cooler 121 and aftercooler 122 that establish ties in proper order, and oil cooler 121 is connected with the water inlet of cooling water system 1, and aftercooler 122 is connected with the delivery port of cooling water system 1. After water with the temperature of 38 ℃ is sequentially introduced into the oil cooler 121 and the after-cooler 122, the outlet water temperature is lower than 38 ℃, and then the outlet water is mixed with the hot water of the warming line, so that the temperature of the water generated by the warming line is reduced to 80 ℃.
Referring to fig. 1, a flow switch 123 is arranged between the aftercooler 122 and the water outlet of the cooling water system 1, and the water flow in the cooling line can be adjusted according to the flow switch 123, so that the outlet water temperature of the cooling water system 1 can be adjusted, and the cooling water can meet different heat recovery customers. A flow regulating valve 13 is arranged on the water inlet of the cooling water system 1. The flow regulating valve 13 can be used for directly setting the flow according to the design, and the valve can automatically eliminate the residual pressure head of the pipeline and the flow deviation caused by pressure fluctuation under the action of water. The set flow is kept unchanged no matter how the system pressure changes, the functions of the valve enable the flow regulation of the pipe network to be completed at one time, the work of regulating the network is changed into simple flow distribution, and the hydraulic imbalance of the pipe network is effectively solved.
Further, the heat recovery system 2 includes a water storage tower 21, a water tank 22, and a water pump 23 for driving circulation of cooling water, the water pump 23 is disposed between the water tank 22 and the water inlet of the cooling water system 1, and the water storage tower 21 is disposed between the water tank 22 and the water outlet of the cooling water system 1. The water outlet of the cooling water system 1 is provided with a three-way proportional valve 24, and the three-way proportional valve 24 is respectively connected with the water storage tower 21, the water tank 22 and the water outlet of the intercooler 113. The water pump 23 is turned on to make the water in the water tank 22 flow into the cooling water system 1, and the water is introduced into the water storage tower 21 after heat exchange with the compressor, so that heat is recycled. After the tower 21 is filled with water, the switch to the three-way proportional valve 24 of the tank 22 is opened and the other two switches are closed, so that the water is recovered into the tank 22. When the outlet water temperature of the cooling water system 1 is higher than 80 ℃, the switch of the three-way proportional valve 24 leading to the water outlet of the intercooler 113 is opened, so that the water carries out heat exchange again, and the outlet water temperature is ensured to be 80 ℃.
Referring to fig. 1, a secondary cooling water heat exchanger 25 is disposed between the three-way proportional valve 24 and the water tank 22, an expansion tank 26 is disposed in the heat recovery system 2, and the water pump 23 is communicated with the expansion tank 26 through the secondary cooling water heat exchanger 25. Two ends of the secondary cooling water heat exchanger 25 are respectively provided with a two-way regulating valve 27 and a first one-way valve 28, the two-way regulating valve 27 is connected with the water pump 23, and the first one-way valve 28 is connected with the expansion tank 26. The temperature of the recovered water can be further lowered by the secondary cooling water heat exchanger 25, and the temperature of the water introduced into the cooling water system 1 can be raised to 38 ℃ to meet the requirement. If the temperature of the water in the water tank 22 is lower than 38 ℃, one switch of the two-way regulating valve 27 can be closed, so that the water is introduced into the secondary cooling water heat exchanger 25, and the temperature requirement of the inlet water is met after heat exchange. If the temperature of the water in the water tank 22 is higher than or equal to 38 ℃, the switch of the two-way regulating valve 27 leading to the secondary cooling water heat exchanger 25 can be closed, so that the water in the water tank 22 is directly led into the first one-way valve 28 through the water pump 23 for expansion tank 26.
Two circulating pumps 29 which are connected in parallel are arranged between the expansion tank 26 and the water inlet of the cooling water system 1, one sides of the two circulating pumps 29 are respectively connected with a second one-way valve 30, and one end, away from the circulating pump 29, of the second one-way valve 30 is provided with a pressure sensor 31. When water with pressure outside enters the expansion tank 26 air bag, nitrogen sealed in the tank is compressed, the volume of the compressed gas is reduced and the pressure is increased according to the Boyle's law of gas, and water inflow is stopped until the pressure of the gas in the expansion tank 26 is consistent with the pressure of the water. When the water loss pressure decreases, the gas pressure in the expansion tank 26 is greater than the water pressure, and the gas expands to push out the water in the air bag to the system. By arranging two circulating pumps 29 and two one-way valves, the flow rate and pressure of the water in the heat recovery system 2 can be adjusted, and the pressure of the water in the pipeline can be accurately seen through the pressure sensor 31.
Referring to fig. 1, a safety valve 32 and an air release valve 33 are installed between a pressure sensor 31 and a water inlet of a cooling water system 1, and the safety valve 32 plays a safety protection role in the system. When the system pressure exceeds a specified value, the safety valve 32 is opened to discharge a part of liquid in the system to the outside, so that the system pressure does not exceed an allowable value, and the system is ensured not to have an accident due to overhigh pressure. The air release valve 33 can reduce noise and vibration to a certain extent, and improves the stability of operation.
The implementation principle of the embodiment is as follows: water with the temperature of 38 ℃ is introduced into a water inlet of a cooling system, cooling water is divided into two lines for circulation, a part of cooling water is subjected to heat exchange through a primary compressor 111, the water temperature reaches 50-60 ℃, then the cooling water is subjected to heat exchange through a secondary compressor 112, the water temperature reaches 110-170 ℃, and at the moment, hot water passes through an intercooler 113. Meanwhile, the temperature of the other part of cooling water is reduced to be lower than 38 ℃ after passing through the cooling circuit, the temperature of the outlet water is about 80 ℃ after the cooling circuit is mixed and reacted with the water with different temperatures in the heating circuit, and compared with three cooling water circuits connected in parallel, the two cooling water circuits are arranged, so that the heat loss is effectively reduced, the heat exchange efficiency is improved, and the outlet water temperature meets the requirements of customers.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides an oil-free air compressor warm water recovery system, including cooling water system (1) and with heat recovery system (2) that cooling water system (1) is connected, the cooling water can cooling water system (1) with circulate between heat recovery system (2), its characterized in that: the cooling water system (1) comprises a temperature rising line and a cooling line connected with the temperature rising line in parallel, wherein the temperature rising line comprises a first-stage compressor (111), a second-stage compressor (112) and an intercooler (113) which are sequentially connected in series;
the primary compressor (111) is connected with a water inlet of the cooling water system (1), and the intercooler (113) is connected with a water outlet of the cooling water system (1).
2. The oil-free air compressor warm water recovery system of claim 1, characterized in that: the cooling circuit comprises an oil cooler (121) and an aftercooler (122) which are sequentially connected in series, the oil cooler (121) is connected with a water inlet of the cooling water system (1), and the aftercooler (122) is connected with a water outlet of the cooling water system (1).
3. The oil-free air compressor warm water recovery system of claim 2, characterized in that: and a flow switch (123) is arranged between the aftercooler (122) and the water outlet of the cooling water system (1).
4. The oil-free air compressor warm water recovery system of claim 1, characterized in that: and a flow regulating valve (13) is arranged on a water inlet of the cooling water system (1).
5. The oil-free air compressor warm water recovery system of claim 1, characterized in that: the heat recovery system (2) comprises a water storage tower (21), a water tank (22) and a water pump (23) for driving the cooling water to circulate, wherein the water pump (23) is arranged between the water tank (22) and a water inlet of the cooling water system (1), and the water storage tower (21) is arranged between the water tank (22) and a water outlet of the cooling water system (1);
the water outlet of the cooling water system (1) is provided with a three-way proportional valve (24), and the three-way proportional valve (24) is respectively connected with the water storage tower (21), the water tank (22) and the water outlet of the intercooler (113).
6. The oil-free air compressor warm water recovery system of claim 5, characterized in that: a secondary cooling water heat exchanger (25) is arranged between the three-way proportional valve (24) and the water tank (22), an expansion tank (26) is arranged in the heat recovery system (2), and the water pump (23) is communicated with the expansion tank (26) through the secondary cooling water heat exchanger (25);
two ends of the secondary cooling water heat exchanger (25) are respectively provided with a two-way regulating valve (27) and a first one-way valve (28), the two-way regulating valve (27) is connected with the water pump (23), and the first one-way valve (28) is connected with the expansion tank (26).
7. The oil-free air compressor warm water recovery system of claim 6, characterized in that: expansion tank (26) with be provided with two circulating pump (29) that connect in parallel each other between the water inlet of cooling water system (1), two one side of circulating pump (29) is connected with second check valve (30) respectively, second check valve (30) are kept away from the one end of circulating pump (29) is provided with pressure sensor (31).
8. The oil-free air compressor warm water recovery system of claim 7, characterized in that: and a safety valve (32) and a vent valve (33) are arranged between the pressure sensor (31) and a water inlet of the cooling water system (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020574387.2U CN212250386U (en) | 2020-04-17 | 2020-04-17 | Oilless air compressor warm water recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020574387.2U CN212250386U (en) | 2020-04-17 | 2020-04-17 | Oilless air compressor warm water recovery system |
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| Publication Number | Publication Date |
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| CN212250386U true CN212250386U (en) | 2020-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202020574387.2U Active CN212250386U (en) | 2020-04-17 | 2020-04-17 | Oilless air compressor warm water recovery system |
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| CN (1) | CN212250386U (en) |
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2020
- 2020-04-17 CN CN202020574387.2U patent/CN212250386U/en active Active
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