Waste heat recovery unit of centrifugal air compressor

Abstract

The utility model relates to the technical field of waste heat recovery equipment, in particular to a waste heat recovery unit of a centrifugal air compressor, which is used for carrying out heat exchange treatment on waste heat of cooling water generated by the centrifugal air compressor, and adopts the technical scheme that the waste heat recovery unit comprises a water circulation device and a heat exchange device, the water circulation device connects the centrifugal air compressor and the heat exchange device through a pipeline to achieve water circulation, and the water circulation device comprises a first cavity. By arranging the heat exchange device with the sub-chambers, high-temperature cooling water and high-temperature steam are separated through the partition plate, waste heat recovery and heat exchange are independently carried out through the first heat exchange assembly and the high-temperature cooling water as well as through the second heat exchange assembly and the high-temperature steam, and energy waste caused by direct emission of the high-temperature steam is avoided; the heat exchange efficiency of waste heat recovery is improved; meanwhile, mutual interference between high-temperature cooling water and high-temperature steam can be avoided through the heat exchange device with the separated cavities, and the stability and reliability of the whole system of the heat exchange unit are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery equipment, in particular to a waste heat recovery unit for a centrifugal air compressor. Background Art

[0002] Traditional centrifugal air compressors use water cooling or oil cooling for circulating cooling during operation. During the operation of water-cooled centrifugal air compressors, a large amount of high-temperature cooling water is generated by the cooling centrifugal air compressor. The high-temperature cooling water is usually subjected to heat exchange treatment through a waste heat recovery device. However, the heat exchange efficiency of existing waste heat recovery devices is low, and a large amount of high-temperature steam generated in the high-temperature cooling water is often directly discharged into the environment without being utilized, resulting in energy waste.

[0003] In view of this, we propose a centrifugal air compressor waste heat recovery unit to solve the existing problems. Utility Model Content

[0004] The purpose of the utility model is to provide a centrifugal air compressor waste heat recovery unit, which can efficiently recover the waste heat in the cooling water of the centrifugal air compressor and reuse it for a second time, so as to solve the problems of waste heat waste and low heat exchange efficiency raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a centrifugal air compressor waste heat recovery unit, which is used for heat exchange treatment of the waste heat of cooling water generated by the centrifugal air compressor, and includes a water circulation device and a heat exchange device. The water circulation device connects the centrifugal air compressor and the heat exchange device through a pipeline to realize water circulation. The water circulation device includes a first chamber, one end of which is connected to the first chamber and is used to store high-temperature cooling water used by the centrifugal air compressor. A second chamber is provided above the first chamber, and the second chamber is used to store steam generated by the high-temperature cooling water. A partition is provided between the first chamber and the second chamber, and air holes densely distributed and penetrating the partition are provided on the surface of the partition. A first heat exchange component is provided in the first chamber, and a second heat exchange component is provided in the second chamber. The water outlet ends of the first heat exchange component and the second heat exchange component are connected to storage tanks.

[0006] Preferably, the first heat exchange component is an annular water supply pipe, and the first heat exchange component is immersed in the first chamber to exchange heat with the cooling water used by the air compressor;

[0007] The second heat exchange component is a multi-layer fin-shaped water supply pipe stacked in a matrix structure and interconnected. The second heat exchange component is arranged in the second chamber. Cold water flows in the multi-layer fin-shaped water supply pipe. The surface contacts the steam formed by the cooling water, and the steam is condensed by cooling to perform heat exchange.

[0008] Preferably, the first heat exchange component also includes a first water supply pipe and a first manifold, the first water supply pipe is connected to the water inlet of the first heat exchange component, and is used to provide cold water to the first heat exchange component, the first manifold is connected to the water outlet of the first heat exchange component, and the other end of the first manifold is connected to the storage tank, and is used to collect the water after heat exchange in the first heat exchange component and introduce it into the storage tank.

[0009] Preferably, the second heat exchange component also includes a second water supply pipe and a second manifold, the water inlet end of the second heat exchange component is connected to the second water supply pipe, the water outlet end is connected to the second manifold, and the other end of the second manifold is connected to the storage tank.

[0010] Preferably, the plurality of pipelines include:

[0011] A drain pipe is used to pump the cooling water in the centrifugal air compressor to the heat exchange device through a water circulation device. A two-way valve is also installed on the drain pipe to control the on-off of the water channel of the drain pipe;

[0012] The reflux pipe is used to pump the cooling water after heat exchange in the heat exchange device back to the centrifugal air compressor through the water circulation device as a coolant. A three-way valve is installed on the reflux pipe, and the remaining end of the three-way valve is also connected to a water supply pipe.

[0013] Preferably, the water circulation device comprises two pump bodies respectively arranged on the drain pipe and the return pipe for driving the water flow in the pipeline;

[0014] The water circulation device also includes a filtering device, which is arranged on the pipeline between the drain pipe and the first chamber and is used to filter impurities in the cooling water discharged by the centrifugal air compressor to protect the internal components of the heat exchange device from contamination and blockage.

[0015] Preferably, the partition layer is an arc-shaped partition sheet with an end surface concave downward.

[0016] Preferably, the heat exchange device and the storage tank are both provided with a pressure relief valve, and a temperature sensor is also integrated in the pressure relief valve.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets up a heat exchange device with divided chambers, separates high-temperature cooling water and high-temperature steam by a partition, and performs waste heat recovery and heat exchange separately through the first heat exchange component and the high-temperature cooling water, and the second heat exchange component and the high-temperature steam, thereby avoiding energy waste caused by direct discharge of high-temperature steam and improving the heat exchange efficiency of waste heat recovery; at the same time, the heat exchange device with divided chambers can also avoid mutual interference between high-temperature cooling water and high-temperature steam, thereby improving the stability and reliability of the overall system of the heat exchange unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the overall layout structure connection relationship of the utility model;

[0019] Figure 2 This is a schematic diagram of the internal perspective structure of the heat exchange device of the utility model;

[0020] Figure 3 This is a cross-sectional view of the interlayer structure of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure and connection relationship between the second heat exchange component and the second water supply pipe and the second return pipe of the utility model.

[0022] In the figure: 1. water circulation device; 2. drain pipe; 3. return pipe; 4. heat exchange device; 41. first chamber; 42. partition; 43. second chamber; 44. air vent; 5. first heat exchange component; 51. first water supply pipe; 52. first manifold; 6. second heat exchange component; 61. second water supply pipe; 62. second manifold; 7. storage tank; 8. water supply pipe; 9. pressure relief valve. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the centrifugal air compressor waste heat recovery unit proposed in the utility model is used for heat exchange treatment of the waste heat of cooling water generated by the centrifugal air compressor, and includes a water circulation device 1 and a heat exchange device 4. The water circulation device 1 connects the centrifugal air compressor and the heat exchange device 4 through a pipeline to realize water circulation. The water circulation device 1 includes a first chamber 41, one end of which is connected to the first chamber 41, and is used to store high-temperature cooling water used by the centrifugal air compressor. A second chamber 43 is provided above the first chamber 41, and the second chamber 43 is used to store steam generated by the high-temperature cooling water. A partition 42 is provided between the first chamber 41 and the second chamber 43, and the surface of the partition 42 is provided with air holes 44 which are densely distributed and penetrate the partition 42. A first heat exchange component 5 is provided in the first chamber 41, and a second heat exchange component 6 is provided in the second chamber 43. The water outlet ends of the first heat exchange component 5 and the second heat exchange component 6 are connected to a storage tank 7.

[0025] In the embodiment, the first heat exchange component 5 is an annular water supply pipe, and the first heat exchange component 5 is immersed in the first chamber 41 to exchange heat with the cooling water used by the air compressor;

[0026] The second heat exchange component 6 is a multi-layer fin-shaped water supply pipe stacked in a matrix structure and interconnected. The second heat exchange component 6 is arranged in the second chamber 43. Cold water flows in the multi-layer fin-shaped water supply pipe. The surface contacts the steam formed by the cooling water, and the steam is condensed to perform heat exchange.

[0027] In an embodiment, the first heat exchange component 5 also includes a first water supply pipe 51 and a first manifold 52. The first water supply pipe 51 is connected to the water inlet of the first heat exchange component 5 for providing cold water to the first heat exchange component 5. The first manifold 52 is connected to the water outlet of the first heat exchange component 5. The other end of the first manifold 52 is connected to the storage tank 7 for collecting the water after heat exchange in the first heat exchange component 5 and introducing it into the storage tank 7.

[0028] In an embodiment, the second heat exchange component 6 also includes a second water supply pipe 61 and a second manifold 62, the water inlet end of the second heat exchange component 6 is connected to the second water supply pipe 61, the water outlet end is connected to the second manifold 62, and the other end of the second manifold 62 is connected to the storage tank 7.

[0029] In an embodiment, the plurality of pipelines comprises:

[0030] The drain pipe 2 is used to pump the cooling water in the centrifugal air compressor to the heat exchange device 4 through the water circulation device 1. A two-way valve is also installed on the drain pipe 2 to control the water flow of the drain pipe 2.

[0031] The reflux pipe 3 is used to pump the cooling water after heat exchange in the heat exchange device 4 back to the centrifugal air compressor through the water circulation device 1 as a coolant. A three-way valve is installed on the reflux pipe 3, and the remaining end of the three-way valve is also connected to the water supply pipe 8.

[0032] In the embodiment, the water circulation device 1 includes two pump bodies respectively arranged on the drain pipe 2 and the return pipe 3 for driving the water flow in the pipes;

[0033] The water circulation device 1 also includes a filtering device, which is arranged on the pipeline between the drain pipe 2 and the first chamber 41 and is used to filter impurities in the cooling water discharged by the centrifugal air compressor to protect the internal components of the heat exchange device 4 from contamination and blockage.

[0034] In the embodiment, the partition layer 42 is an arc-shaped partition sheet with an end surface concave downward.

[0035] In the embodiment, both the heat exchange device 4 and the storage tank 7 are provided with a pressure relief valve 9 , and a temperature sensor is also integrated in the pressure relief valve 9 .

[0036] The working principle of the waste heat recovery unit of the centrifugal air compressor based on the first embodiment is: when the utility model is in use, the water supply pipe 8 enters the centrifugal air compressor along the return pipe 3 through the three-way valve under the drive of the water circulation device 1, and is used as cooling water when the centrifugal air compressor is in operation. After the cooling water absorbs the heat emitted by the centrifugal air compressor during use, it becomes high-temperature cooling water. The cooling water is pumped into the first chamber 41 of the heat exchange device 4 by the pump body (the pump body arranged on the drain pipe 2) through the drain pipe 2. The high-temperature steam carried by the high-temperature cooling water moves upward through the air vents 44 on the partition and enters the second chamber 43. A first heat exchange component 5 is provided in the first chamber 41. When the high-temperature cooling water enters the first chamber 41, the first heat exchange component 5 is immersed in the high-temperature cooling water. The inlet end of the first heat exchange component 5 is connected to There is a first water supply pipe 51, which is used to pass cold water into the first heat exchange component 5. When the cold water flows through the first heat exchange component 5, it exchanges heat with the high-temperature cooling water; in the second chamber 43, the water inlet end of the second heat exchange component 6 is connected to the second water supply pipe 61, which is used to pass cold water into the second heat exchange component 6. The second heat exchange component 6 is a multi-layer fin-shaped water supply pipe. The multi-layer fin-shaped structure makes the contact area between the second heat exchange component 6 and the high-temperature steam in the second chamber 43 wider. The steam contacts with its surface and condenses due to condensation. The cold water flows in the multi-layer fin-shaped water supply pipe, absorbs the heat of the steam and is heated. At the same time, the high-temperature steam is condensed due to condensation to further release heat and exchanges heat with the cold water in the multi-layer fin-shaped water supply pipe. The condensed high-temperature cooling water flows back to the first chamber 41 through the air holes 44 on the interlayer 42.

[0037] After the high-temperature cooling water has undergone heat exchange, the density of the cold water is greater than that of the hot water. The low-temperature cooling water whose temperature has been reduced after heat exchange in the heat exchange device 4 tends to move to the bottom of the first chamber 41. The high-temperature cooling water just pumped into the first chamber 41 through the drain pipe 2 tends to move to the top of the first chamber 41 because its density is smaller than that of the low-temperature cooling water, so that a circulation is formed between the high-temperature cooling water in the first chamber 41 and the low-temperature cooling water after heat exchange, as shown in FIG. Figure 1 As shown, the return pipe 3 is located below the first chamber 41, and is used to pump the low-temperature cooling water (i.e., the cooling water in the bottom part of the first chamber 41) after heat exchange in the heat exchange device 4 through the return pipe 3 and back to the centrifugal air compressor by a pump body arranged on the return pipe 3, and circulate it as new cooling water. Due to the inevitable evaporation loss of high-temperature cooling water, a three-way valve is installed on the return pipe 3, and the two ends of the three-way valve are respectively connected to the water circulation device 1 and the heat exchange device 4, and the remaining end is connected to the water supply pipe 8, which is used to add new cooling water to the centrifugal air compressor when necessary, so as to ensure that the centrifugal air compressor has sufficient cooling water during operation.

[0038] The hot water formed by heat exchange with high-temperature cooling water in the first heat exchange component 5 and the second heat exchange component 6 is respectively collected through the first return pipe 3 and the second return pipe 3 and introduced into the storage tank 7 for storage. The storage tank 7 is provided with a pressure relief valve 9 to prevent the internal pressure from being too high and causing safety hazards. The pressure relief valve 9 also integrates a temperature sensor for monitoring the internal temperature. The storage tank 7 is an insulated tank structure.

[0039] In the second embodiment, the hot water formed after being heated by the high-temperature cooling water in the first heat exchange component 5 and the second heat exchange component 6 is respectively collected through the first return pipe 3 and the second return pipe 3 and introduced into different storage tanks 7 for separate storage (not shown in the figure), thereby obtaining two kinds of hot water with different temperatures for backup.

[0040] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A centrifugal air compressor waste heat recovery unit, used for heat exchange treatment of cooling water waste heat generated by a centrifugal air compressor, characterized in that: The invention comprises a water circulation device (1) and a heat exchange device (4), wherein the water circulation device (1) connects a centrifugal air compressor and the heat exchange device (4) via a pipeline to realize water circulation, wherein the water circulation device (1) comprises a first chamber (41), wherein one end of the pipeline is in communication with the first chamber (41) and is used to store high-temperature cooling water used by the centrifugal air compressor, wherein a second chamber (43) is provided above the first chamber (41), wherein the second chamber (43) is used to store steam generated by the high-temperature cooling water, wherein an interlayer (42) is provided between the first chamber (41) and the second chamber (43), wherein the surface of the interlayer (42) is provided with air holes (44) which are densely distributed and penetrate the interlayer (42), wherein a first heat exchange component (5) is provided in the first chamber (41), wherein a second heat exchange component (6) is provided in the second chamber (43), and wherein the water outlet ends of the first heat exchange component (5) and the second heat exchange component (6) are connected to storage tanks (7).

2. The centrifugal air compressor waste heat recovery unit according to claim 1, characterized in that: The first heat exchange component (5) is an annular water supply pipe, and the first heat exchange component (5) is immersed in the first chamber (41) to exchange heat with cooling water used by the air compressor; The second heat exchange component (6) is a multi-layer fin-shaped water supply pipe stacked in a matrix structure and interconnected. The second heat exchange component (6) is arranged in the second chamber (43). Cold water flows in the multi-layer fin-shaped water supply pipe. The surface of the multi-layer fin-shaped water supply pipe contacts the steam formed by the cooling water, and the steam is condensed by cooling to perform heat exchange.

3. The centrifugal air compressor waste heat recovery unit according to claim 2, characterized in that: The first heat exchange component (5) further comprises a first water supply pipe (51) and a first manifold (52); the first water supply pipe (51) is connected to the water inlet of the first heat exchange component (5) and is used to provide cold water to the first heat exchange component (5); the first manifold (52) is connected to the water outlet of the first heat exchange component (5); the other end of the first manifold (52) is connected to the storage tank (7) and is used to collect water after heat exchange in the first heat exchange component (5) and introduce it into the storage tank (7).

4. The centrifugal air compressor waste heat recovery unit according to claim 2, characterized in that: The second heat exchange assembly (6) further comprises a second water supply pipe (61) and a second manifold (62); the water inlet end of the second heat exchange assembly (6) is connected to the second water supply pipe (61), the water outlet end is connected to the second manifold (62), and the other end of the second manifold (62) is connected to the storage tank (7).

5. The centrifugal air compressor waste heat recovery unit according to claim 1, characterized in that: A plurality of said pipelines include: A drain pipe (2) is used to pump cooling water in the centrifugal air compressor to the heat exchange device (4) through the water circulation device (1); a two-way valve is also installed on the drain pipe (2) to control the on-off of the water channel of the drain pipe (2); The return pipe (3) is used to pump the cooling water after heat exchange in the heat exchange device (4) back to the centrifugal air compressor via the water circulation device (1) as a coolant. A three-way valve is installed on the return pipe (3), and the remaining end of the three-way valve is also connected to a water supply pipe (8).

6. The centrifugal air compressor waste heat recovery unit according to claim 5, characterized in that: The water circulation device (1) comprises two pump bodies respectively arranged on the drainage pipe (2) and the return pipe (3) for driving the water to flow in the pipes; The water circulation device (1) also includes a filtering device, which is arranged on the pipeline between the drain pipe (2) and the first chamber (41) and is used to filter impurities in the cooling water discharged by the centrifugal air compressor to protect the internal components of the heat exchange device (4) from contamination and blockage.

7. The centrifugal air compressor waste heat recovery unit according to claim 1, characterized in that: The partition layer (42) is an arc-shaped partition sheet with an end surface concave downward.

8. The centrifugal air compressor waste heat recovery unit according to claim 1, characterized in that: The heat exchange device (4) and the storage tank (7) are both provided with a pressure relief valve (9), and a temperature sensor is also integrated in the pressure relief valve (9).

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