Waste heat recovery system of air compressor

Abstract

The utility model relates to the technical field of air compressor waste heat recovery, in particular to an air compressor waste heat recovery system. The air compressor waste heat recovery system comprises an air compressor, a first heat exchanger, a second heat exchanger, a first gas pipeline, a second gas pipeline, a first liquid pipeline and a second liquid pipeline. The first heat exchanger is arranged in the air compressor, the two ends of the first gas pipeline communicate with the air compressor and the first heat exchanger correspondingly, and the two ends of the second gas pipeline communicate with the air compressor and the first heat exchanger correspondingly. The two ends of the first liquid pipeline communicate with the first heat exchanger and the second heat exchanger correspondingly, the two ends of the second liquid pipeline communicate with the first heat exchanger and the second heat exchanger correspondingly, and the first heat exchanger, the first liquid pipeline, the second heat exchanger and the second liquid pipeline jointly form a closed-loop water path. According to the air compressor waste heat recovery system, energy waste can be reduced, energy consumption is reduced, and cost is saved; the temperature in the machine room is reduced, and the working efficiency of operators is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery of air compressors, and in particular to a waste heat recovery system for air compressors. Background Art

[0002] At present, most of the air compressors used in the factory are oil-injected screw air compressors, which generate a lot of heat during the operation of the air compressor. In the existing technology, this part of heat cannot be used, which will cause energy waste and is not conducive to energy saving and consumption reduction; on the other hand, it will cause the temperature in the air compressor room to be too high, which is not conducive to the work of the staff in the room and reduces work efficiency.

[0003] Therefore, it is urgent to design an air compressor waste heat recovery system to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide an air compressor waste heat recovery system, which can reduce energy waste, lower the temperature in the machine room, and improve the work efficiency of operators.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an air compressor waste heat recovery system, comprising an air compressor, a first heat exchanger, a second heat exchanger, a first gas pipeline, a second gas pipeline, a first liquid pipeline and a second liquid pipeline; the first heat exchanger is arranged inside the air compressor, the two ends of the first gas pipeline are respectively connected to the air compressor and the first heat exchanger, and the two ends of the second gas pipeline are respectively connected to the air compressor and the first heat exchanger, so that the high-temperature gas of the air compressor flows from the first gas pipeline through the first heat exchanger for heat exchange, and then flows back to the air compressor through the second gas pipeline;

[0007] The second heat exchanger is connected to the waste liquid inlet pipe and the waste liquid outlet pipe;

[0008] The two ends of the first liquid pipeline are respectively connected to the first heat exchanger and the second heat exchanger, and the two ends of the second liquid pipeline are respectively connected to the first heat exchanger and the second heat exchanger. The first heat exchanger, the first liquid pipeline, the second heat exchanger and the second liquid pipeline together constitute a closed-loop water circuit. The liquid in the closed-loop water circuit can perform heat exchange with the high-temperature gas in the first heat exchanger, and the liquid in the closed-loop water circuit can perform heat exchange with waste liquid in the second heat exchanger.

[0009] As an optional technical solution for an air compressor waste heat recovery system, a three-way valve is provided on the first liquid pipeline or the second liquid pipeline, one port of the three-way valve is connected to a water source, and the other two ports of the three-way valve are both connected to the first liquid pipeline or the second liquid pipeline.

[0010] As an optional technical solution for an air compressor waste heat recovery system, a circulating pump is provided on the first liquid pipeline and / or the second liquid pipeline.

[0011] As an optional technical solution for an air compressor waste heat recovery system, the circulating pump is provided in plurality, and the plurality of circulating pumps are arranged in parallel.

[0012] As an optional technical solution for an air compressor waste heat recovery system, a filter is provided downstream of the three-way valve along the flow direction of the liquid in the closed-loop water circuit, and the filter is located between the circulation pump and the three-way valve.

[0013] As an optional technical solution for an air compressor waste heat recovery system, the filter is provided in plurality, and the filters are provided in one-to-one correspondence with the circulating pumps, and one filter is provided on a branch of each circulating pump.

[0014] As an optional technical solution for an air compressor waste heat recovery system, an air release valve is provided on the first liquid pipeline and / or the second liquid pipeline.

[0015] As an optional technical solution for an air compressor waste heat recovery system, a plurality of check valves are arranged on the first liquid pipeline and / or the second liquid pipeline.

[0016] As an optional technical solution for an air compressor waste heat recovery system, a plurality of solenoid valves are arranged on the first liquid pipeline and / or the second liquid pipeline.

[0017] As an optional technical solution for an air compressor waste heat recovery system, the first heat exchanger and the second heat exchanger are both plate heat exchangers.

[0018] The beneficial effects of the utility model include at least:

[0019] The utility model provides an air compressor waste heat recovery system, which includes an air compressor, a first heat exchanger, a second heat exchanger, a first gas pipeline, a second gas pipeline, a first liquid pipeline and a second liquid pipeline; the first heat exchanger is arranged inside the air compressor, the two ends of the first gas pipeline are respectively connected to the air compressor and the first heat exchanger, and the two ends of the second gas pipeline are respectively connected to the air compressor and the first heat exchanger, so that the high-temperature gas of the air compressor flows from the first gas pipeline through the first heat exchanger for heat exchange, and then flows back to the air compressor through the second gas pipeline. The second heat exchanger is connected to a waste liquid inlet pipe and a waste liquid outlet pipe. The two ends of the first liquid pipeline are respectively connected to the first heat exchanger and the second heat exchanger, and the two ends of the second liquid pipeline are respectively connected to the first heat exchanger and the second heat exchanger. The first heat exchanger, the first liquid pipeline, the second heat exchanger and the second liquid pipeline together constitute a closed-loop water circuit. The liquid in the closed-loop water circuit can perform heat exchange with the high-temperature gas in the first heat exchanger, and the liquid in the closed-loop water circuit can perform heat exchange with the waste liquid in the second heat exchanger. In the present utility model, through the arrangement of the first heat exchanger, the second heat exchanger and the closed-loop water circuit, the heat of the high-temperature gas generated by the air compressor is recycled and reused through two heat exchanges, which not only reduces energy loss, saves energy consumption, and saves costs; it also reduces the temperature of the machine room where the air compressor is located, and improves the work efficiency of the operators; at the same time, the temperature of the waste liquid is increased through two heat exchanges, thereby reducing the temperature rise required for the later treatment of the waste liquid, saving the fuel required for the later treatment of the heated waste liquid, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 A schematic flow chart of an air compressor waste heat recovery system provided in an embodiment of the utility model.

[0022] Reference numerals

[0023] 1. Air compressor; 2. First heat exchanger; 3. Second heat exchanger; 4. First gas pipeline; 5. Second gas pipeline; 6. First liquid pipeline; 7. Second liquid pipeline; 8. Waste liquid inlet pipe; 9. Waste liquid outlet pipe; 10. Three-way valve; 11. Circulation pump; 12. Filter; 13. Air release valve; 14. Check valve; 15. Solenoid valve. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] In the description of this embodiment, unless otherwise specified, the term "plurality" refers to a quantity of two or more than two.

[0029] The present embodiment provides an air compressor waste heat recovery system, which can reduce energy waste, save energy, and save costs; reduce the temperature in the machine room where the air compressor is located, and improve the work efficiency of operators.

[0030] like Figure 1As shown, the air compressor waste heat recovery system mainly includes an air compressor 1, a first heat exchanger 2, a second heat exchanger 3, a first gas pipeline 4, a second gas pipeline 5, a first liquid pipeline 6 and a second liquid pipeline 7; the first heat exchanger 2 is arranged inside the air compressor 1, and the two ends of the first gas pipeline 4 are respectively connected to the air compressor 1 and the first heat exchanger 2, and the two ends of the second gas pipeline 5 are respectively connected to the air compressor 1 and the first heat exchanger 2, so that the high-temperature gas of the air compressor 1 flows from the first gas pipeline 4 through the first heat exchanger 2 for heat exchange, and then flows back to the air compressor 1 through the second gas pipeline 5. The second heat exchanger 3 is connected to the waste liquid inlet pipe 8 and the waste liquid outlet pipe 9. The two ends of the first liquid pipeline 6 are respectively connected to the first heat exchanger 2 and the second heat exchanger 3, and the two ends of the second liquid pipeline 7 are respectively connected to the first heat exchanger 2 and the second heat exchanger 3. The first heat exchanger 2, the first liquid pipeline 6, the second heat exchanger 3 and the second liquid pipeline 7 together constitute a closed-loop water circuit. The liquid in the closed-loop water circuit can exchange heat with the high-temperature gas in the first heat exchanger 2, and the liquid in the closed-loop water circuit can exchange heat with the waste liquid in the second heat exchanger 3.

[0031] Based on the above design, in this embodiment, the high-temperature gas generated by the air compressor 1 can enter the first heat exchanger 2 through the first air inlet pipe to perform heat exchange with the liquid in the closed-loop water circuit, so that the temperature of the liquid in the closed-loop water circuit increases. In other words, the liquid in the closed-loop water circuit takes away the heat of the high-temperature gas in the first heat exchanger 2, so that the high-temperature gas becomes low-temperature gas, and then the low-temperature gas returns to the air compressor 1 through the second gas pipeline 5. The liquid in the closed-loop water circuit that has been heated up flows to the second heat exchanger 3 to perform heat exchange with the waste liquid, so that the temperature of the liquid in the closed-loop water circuit decreases. In other words, the waste liquid takes away the heat of the liquid in the closed-loop water circuit in the second heat exchanger 3, so that the temperature of the waste liquid increases and the temperature of the liquid in the closed-loop water circuit decreases. The liquid in the closed-loop water circuit that has been cooled down flows back to the first heat exchanger 2 through the second liquid pipeline 7 to perform heat exchange with the high-temperature gas again. The heated waste liquid is discharged from the second heat exchanger 3 through the waste liquid outlet pipe 9.

[0032] Compared with the prior art, in this embodiment, the heat of the high-temperature gas generated by the air compressor 1 is recovered and reused through two heat exchanges by setting up the first heat exchanger 2, the second heat exchanger 3 and the closed-loop water circuit, which not only reduces energy loss, saves energy consumption and saves costs; but also reduces the temperature of the machine room where the air compressor 1 is located, and improves the work efficiency of the operators; at the same time, the temperature of the waste liquid is increased through two heat exchanges, thereby reducing the temperature rise required for the subsequent treatment of the waste liquid, saving the fuel required for the subsequent treatment of the waste liquid and saving costs.

[0033] In addition, in this embodiment, the first heat exchanger 2 is built into the air compressor 1. On the one hand, this can save the installation space of the first heat exchanger 2 during assembly and improve the integration; on the other hand, it can also reduce the length of the first gas pipeline 4 and the second gas pipeline 5, save consumables, reduce the heat loss of high-temperature gas in the first gas pipeline 4, save energy consumption, and save costs.

[0034] It should be emphasized that the first heat exchanger 2 in this embodiment is placed inside the air compressor 1, but in order to clearly show the flow path of the high-temperature gas, Figure 1 The first heat exchanger 2 and the air compressor 1 are shown as two parts.

[0035] Optionally, the liquid in the closed-loop water circuit in this embodiment can be set to pure water. The waste liquid inlet pipe 8 can flow with high-concentration waste liquid to be treated in the factory.

[0036] In actual factory operation, the temperature of the waste liquid in the waste liquid inlet pipe 8 is 5°C to 8°C. After heat exchange, the temperature of the waste liquid in the waste liquid outlet pipe 9 is 28°C to 30°C.

[0037] like Figure 1 As shown, in this embodiment, a three-way valve 10 is provided on the first liquid pipeline 6 or the second liquid pipeline 7, one of the ports of the three-way valve 10 is connected to the water source, and the other two ports of the three-way valve 10 are both connected to the first liquid pipeline 6 or the second liquid pipeline 7. The provision of the three-way valve 10 enables the closed-loop water circuit to be replenished with water from an external water source. When the liquid in the closed-loop water circuit is replenished, the operator can close one port of the three-way valve 10 in time, thereby avoiding leakage of the liquid in the closed-loop water circuit and improving safety.

[0038] Furthermore, in this embodiment, a circulation pump 11 is provided on the first liquid pipeline 6 and / or the second liquid pipeline 7. The circulation pump 11 can provide power to the liquid in the closed-loop water circuit to drive the liquid to circulate between the first liquid pipeline 6 and the second liquid pipeline 7.

[0039] Optionally, there are multiple circulating pumps 11, and the multiple circulating pumps 11 are arranged in parallel. In this way, when a certain circulating pump 11 fails, the circulating pumps 11 on other branches can continue to work, thereby improving the reliability and stability of the air compressor waste heat recovery system.

[0040] like Figure 1As shown, in this embodiment, along the flow direction of the liquid in the closed-loop waterway, a filter 12 is provided downstream of the three-way valve 10, and the filter 12 is located between the circulation pump 11 and the three-way valve 10. The setting of the filter 12 can filter the liquid before entering the circulation pump 11, thereby preventing impurities or foreign matter in the liquid from entering the circulation pump 11, and improving the stability and reliability of the operation of the circulation pump 11.

[0041] Optionally, the filter 12 in this embodiment is provided in plurality, and the filters 12 are provided in one-to-one correspondence with the circulation pumps 11 , and a filter 12 is provided on the branch of each circulation pump 11 , so as to ensure that each circulation pump 11 can work stably.

[0042] Understandably, Figure 1 The circulation pump 11, filter 12 and three-way valve 10 shown in the figure are all arranged on the second liquid pipeline 7. The operator can also arrange the circulation pump 11, filter 12 and three-way valve 10 on the first liquid pipeline 6 according to actual needs.

[0043] like Figure 1 As shown, in this embodiment, a vent valve 13 is provided on the first liquid pipeline 6 and / or the second liquid pipeline 7. The vent valve 13 can discharge the gas in the closed-loop water circuit, thereby ensuring that the liquid in the closed-loop water circuit can circulate stably. In this embodiment, the number of vent valves 13 is not limited.

[0044] like Figure 1 As shown, in this embodiment, a plurality of check valves 14 are provided on the first liquid pipeline 6 and / or the second liquid pipeline 7, thereby preventing the backflow of the liquid in the closed-loop water circuit and improving the circulation efficiency of the liquid.

[0045] like Figure 1 As shown, in this embodiment, a plurality of solenoid valves 15 are provided on the first liquid pipeline 6 and / or the second liquid pipeline 7, so that the operator can flexibly control the flow of the liquid in the closed-loop water circuit according to actual needs.

[0046] Optionally, in this embodiment, there is no limitation on the number of the check valves 14 and the solenoid valves 15 , and the operator can flexibly select the number of the check valves 14 and the solenoid valves 15 according to actual needs.

[0047] Optionally, in this embodiment, the first heat exchanger 2 and the second heat exchanger 3 are both plate heat exchangers, or the first heat exchanger 2 and the second heat exchanger 3 are both shell and tube heat exchangers.

[0048] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0049] Note that in the description of this specification, the reference terms "some embodiments", "other embodiments", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. Air compressor waste heat recovery system, characterized in that: The invention comprises an air compressor (1), a first heat exchanger (2), a second heat exchanger (3), a first gas pipeline (4), a second gas pipeline (5), a first liquid pipeline (6) and a second liquid pipeline (7); the first heat exchanger (2) is arranged inside the air compressor (1); the two ends of the first gas pipeline (4) are respectively connected to the air compressor (1) and the first heat exchanger (2); the two ends of the second gas pipeline (5) are respectively connected to the air compressor (1) and the first heat exchanger (2), so that the high-temperature gas of the air compressor (1) flows from the first gas pipeline (4) through the first heat exchanger (2) for heat exchange, and then flows back to the air compressor (1) through the second gas pipeline (5); The second heat exchanger (3) is connected to a waste liquid inlet pipe (8) and a waste liquid outlet pipe (9); The two ends of the first liquid pipeline (6) are respectively connected to the first heat exchanger (2) and the second heat exchanger (3); the two ends of the second liquid pipeline (7) are respectively connected to the first heat exchanger (2) and the second heat exchanger (3); the first heat exchanger (2), the first liquid pipeline (6), the second heat exchanger (3) and the second liquid pipeline (7) together constitute a closed-loop water circuit; the liquid in the closed-loop water circuit can perform heat exchange with the high-temperature gas in the first heat exchanger (2); and the liquid in the closed-loop water circuit can perform heat exchange with the waste liquid in the second heat exchanger (3).

2. The air compressor waste heat recovery system according to claim 1, characterized in that: A three-way valve (10) is provided on the first liquid pipeline (6) or the second liquid pipeline (7), one port of the three-way valve (10) is connected to a water source, and the other two ports of the three-way valve (10) are both connected to the first liquid pipeline (6) or the second liquid pipeline (7).

3. The air compressor waste heat recovery system according to claim 2, characterized in that: A circulation pump (11) is provided on the first liquid pipeline (6) and / or the second liquid pipeline (7).

4. The air compressor waste heat recovery system according to claim 3, characterized in that: The circulation pump (11) is provided in plurality, and the plurality of circulation pumps (11) are arranged in parallel.

5. The air compressor waste heat recovery system according to claim 4, characterized in that: Along the flow direction of the liquid in the closed-loop water circuit, a filter (12) is provided downstream of the three-way valve (10), and the filter (12) is located between the circulation pump (11) and the three-way valve (10).

6. The air compressor waste heat recovery system according to claim 5, characterized in that: The filters (12) are arranged in plurality, and the filters (12) are arranged in a one-to-one correspondence with the circulation pumps (11), and one filter (12) is arranged on a branch line of each circulation pump (11).

7. The air compressor waste heat recovery system according to any one of claims 1 to 6, characterized in that: The first liquid pipeline (6) and / or the second liquid pipeline (7) is provided with an air release valve (13).

8. The air compressor waste heat recovery system according to any one of claims 1 to 6, characterized in that: A plurality of check valves (14) are arranged on the first liquid pipeline (6) and / or the second liquid pipeline (7).

9. The air compressor waste heat recovery system according to any one of claims 1 to 6, characterized in that: A plurality of solenoid valves (15) are arranged on the first liquid pipeline (6) and / or the second liquid pipeline (7).

10. The air compressor waste heat recovery system according to any one of claims 1 to 6, characterized in that: The first heat exchanger (2) and the second heat exchanger (3) are both plate heat exchangers.

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