Double-core-set heat exchanger and centrifugal air compressor waste heat recovery system comprising same

Abstract

The utility model discloses a double-core heat exchanger and a centrifugal air compressor waste heat recovery system comprising the same, the double-core heat exchanger comprises a cavity, a heat exchange module and a cooling module are arranged in the cavity side by side, and the upper side and the lower side of the heat exchange module and the upper side and the lower side of the cooling module abut against the cavity through sealing strips; the heat exchange module comprises a plurality of first heat conduction plates and heat conduction pipes, and the heat conduction pipes penetrate through the first heat conduction plates. The cooling module comprises a plurality of second heat conducting plates and cooling pipes, and the cooling pipes pass through the second heat conducting plates; the side, close to the heat exchange module, of the cavity is connected with a compressed air inlet pipe, and the side, close to the cooling module, of the cavity is connected with a compressed air output pipe. According to the centrifugal air compressor, the heat exchange module and the cooling module are integrated in the same cavity, an independent heat exchanger, a cooler and a connecting pipeline which are installed in series in a traditional scheme are omitted, the product cost is reduced, the overall pressure loss of gas flowing through is reduced, and the operation stability of the centrifugal air compressor after heat recovery technical improvement is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor technology field especially relates to a double core group heat exchanger and contain its centrifugal air compressor waste heat recovery system. BACKGROUND

[0002] Centrifugal air compressor can produce a large amount of waste heat in the operation process, if these heat is not utilized, not only will cause energy waste, also will increase the burden of cooling system. Through waste heat recovery device, can transfer these heat to another medium, such as water, for industrial process or domestic hot water supply, thereby significantly reduce energy consumption.

[0003] At present, the waste heat recovery application of centrifugal air compressor has been relatively popular, one of the common practices is to increase a heat exchanger before each cooler of centrifugal air compressor, the heat is led out through the heat exchanger, then enters the original cooler of centrifugal air compressor again, as shown in Figure 4 , the figure expresses the heat exchanger and gas path process (black thick line) increased between primary and secondary.

[0004] This waste heat recovery technology is more economical and practical, but after increasing the heat exchanger and related pipeline and elbow, the resistance in the gas conveying process also increases. For example, the increased heat exchanger is usually 3 ~ 5Kpa resistance, the related pipeline and elbow is about 3 ~ 5Kpa resistance (about 1Kpa for each elbow), so the total resistance formed by the increased heat exchanger and pipeline and elbow is usually 6 ~ 10Kpa. At the same time, considering the pressure ratio relationship of multi-stage centrifugal machine, then in the scene of three-stage compression heat full recovery, it will cause 60 ~ 80Kpa or more resistance effect. And this resistance will easily cause centrifugal machine surge if used on the centrifugal machine set with insufficient pressure surge margin, which seriously affects the safe operation of equipment. INVENTION CONTENTS

[0005] In order to solve the above problems, the utility model provides a double core group heat exchanger and contains its centrifugal air compressor waste heat recovery system, can optimize the pressure loss of heat exchanger, heat exchanger and pipeline between cooler, ensure the normal operation of equipment.

[0006] Therefore, the first technical scheme of the utility model is: a double core group heat exchanger, including cavity, heat exchange module and cooling module are arranged side by side in the cavity, and heat exchange module, cooling module upper side and cavity are abutted by sealing strip;The heat exchange module includes a plurality of first heat conduction plates and heat conduction pipes, and the heat conduction pipes pass through between the first heat conduction plates;The cooling module includes a plurality of second heat conduction plates and cooling pipes, and the cooling pipes pass through between the second heat conduction plates;The cavity is connected with compressed air inlet pipe near heat exchange module side, and is connected with compressed air outlet pipe near cooling module side.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the heat pipe is provided with a low-temperature water inlet and a high-temperature water outlet, and the cooling pipe is provided with a cooling water inlet and a cooling water outlet.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the cavity is a cuboid structure, the heat exchange module and the cooling module are arranged along the length direction of the cavity, and the side walls corresponding to the long sides of the cavity are kept parallel.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the cavity is a cylindrical structure, the heat exchange module and the cooling module are arranged along the axial direction of the cavity, and the compressed air inlet pipe and the compressed air outlet pipe are communicated with the circumferential surface of the cavity.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the compressed air inlet pipe and the compressed air outlet pipe are connected to the cavity through arc-shaped elbows.

[0011] The second technical scheme of the utility model is: a waste heat recovery system of a centrifugal air compressor containing the above-mentioned double-core group heat exchanger, comprising a plurality of serially connected compression units, heat exchange pipelines and cooling pipelines; a double-core group heat exchanger is arranged after each compression unit, the heat exchange pipelines are communicated with the heat exchange modules of the double-core group heat exchangers, and the cooling pipelines are communicated with the cooling modules of the double-core group heat exchangers.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the heat exchange pipeline is divided into a heat exchange water inlet main pipe and a heat exchange water outlet main pipe, the heat exchange water inlet main pipe is connected with the low-temperature water inlets of the heat exchange modules of the double-core group heat exchangers, the heat exchange water outlet main pipe is connected with the high-temperature water outlets of the heat exchange modules of the double-core group heat exchangers, and a first regulating valve is arranged at the high-temperature water outlet.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the cooling pipeline is divided into a cooling water inlet main pipe and a cooling water outlet main pipe, the cooling water inlet main pipe is connected with the cooling water inlets of the cooling modules of the double-core group heat exchangers, the cooling water outlet main pipe is connected with the cooling water outlets of the cooling modules of the double-core group heat exchangers, and a second regulating valve is arranged at the cooling water outlet.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] 1. The heat exchange module and the cooling module are integrated in the same cavity, the independent heat exchanger, the cooler and the connecting pipeline in the traditional scheme are omitted, the cost of the product is reduced, the structural integration design and the flow channel optimization are realized, the overall pressure loss of the gas flow is reduced, and the operation stability of the centrifugal air compressor after the heat recovery technical improvement is improved.

[0016] 2. By the parallel heat exchange module and cooling module in the cavity, turbulence and local resistance caused by multi-stage elbow and long distance pipeline are avoided, and safe operation of the centrifugal unit under high pressure ratio working condition is ensured.

[0017] 3. The cuboid or cylindrical cavity design is suitable for various installation scenes, the heat exchange module and the cooling module are quickly disassembled and assembled through the sealing strip, and the pressure loss of the heat exchanger is reduced by increasing the airflow section area and low flow resistance design technology.

[0018] 4. The compressed air inlet pipe and the output pipe are connected through a circular arc elbow, further reducing the local resistance of the elbow and the pressure loss.

[0019] 5. When the double-core group heat exchanger is connected in series between the multi-stage compression units, the first and second regulating valves are used to realize the inter-stage flow matching, prevent the temperature rise from being out of control or the material from being fatigued due to single stage overload, and the water flow can be controlled to realize 92℃ hot water output. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure diagram of the double-core group heat exchanger (cuboid) of the utility model;

[0021] Figure 2 It is a structure diagram of the double-core group heat exchanger (cylindrical) of the utility model;

[0022] Figure 3 It is a flow chart of the waste heat recovery system of the utility model;

[0023] Figure 4 It is a flow chart of the existing waste heat recovery system.

[0024] In the figure, the first cavity 1, the heat exchange module 2, the low-temperature water inlet 21, the high-temperature water outlet 22, the first regulating valve 23, the cooling module 3, the cooling water inlet 31, the cooling water outlet 32, the second regulating valve 33, the sealing strip 4, the compressed air inlet pipe 5, the compressed air outlet pipe 6, the second cavity 7, the heat exchange water inlet main pipe 81, the heat exchange water outlet main pipe 82, the cooling water inlet main pipe 91, and the cooling water outlet main pipe 92 are marked. DETAILED DESCRIPTION

[0025] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0027] Example 1

[0028] The dual-core heat exchanger described in this embodiment includes a first cavity 1, which has a rectangular parallelepiped shape. A heat exchange module 2 and a cooling module 3 are arranged side-by-side within the first cavity 1. Both the heat exchange module 2 and the cooling module 3 are arranged along the length of the first cavity 1 and are parallel to the sidewalls corresponding to the long side of the first cavity 1, thereby increasing the airflow cross-sectional area and achieving low flow resistance. Simultaneously, the upper and lower sides of the heat exchange module 2 and the cooling module 3 abut against the first cavity 1 through sealing strips 4, ensuring smooth airflow; that is, high-pressure gas passes through the heat exchange module and the cooling module to perform heat exchange and cooling operations.

[0029] The first cavity 1 is connected to the compressed air inlet pipe 5 on the side near the heat exchange module 2, and the compressed air inlet pipe 5 is connected to the first cavity 1 through an arc-shaped elbow, which can further reduce pressure loss.

[0030] The heat exchange module 2 includes several first heat-conducting plates and heat-conducting pipes. The multiple first heat-conducting plates can be arranged horizontally, and a mutually isolated ventilation channel is formed between adjacent first heat-conducting plates to facilitate the flow of high-pressure air. The heat-conducting pipes pass between the first heat-conducting plates and can exchange heat with the first heat-conducting plates. The heat-conducting pipes are provided with a low-temperature water inlet 21 and a high-temperature water outlet 22. After the low-temperature water enters and exchanges heat with the first heat-conducting plates, it becomes high-temperature water and flows out.

[0031] The first cavity 1 is connected to the compressed air output pipe 6 on the side near the cooling module 3. The compressed air output pipe 6 is connected to the first cavity 1 through an arc-shaped elbow, which can further reduce pressure loss.

[0032] The cooling module 3 includes several second heat-conducting plates and cooling pipes. The second heat-conducting plates can be arranged laterally, forming mutually isolated ventilation channels between adjacent plates to facilitate the flow of high-pressure air. The second heat-conducting plates can be made of laminated thin plates (1-3 mm thick) of high thermal conductivity aluminum alloy or stainless steel, with corrugations or fins stamped on the surface to increase the cooling area. The cooling pipes pass between the second heat-conducting plates and are equipped with a cooling water inlet 31 and a cooling water outlet 32. Cooling water enters the cooling pipes and exchanges heat with the second heat-conducting plates, thereby reducing the heat of the second heat-conducting plates and allowing them to transfer more heat from the air, thus lowering the air temperature.

[0033] Example 2

[0034] This embodiment has a similar structure to Embodiment 1, except that it includes a second cavity 7, which is a cylindrical structure. The heat exchange module 2 and the cooling module 3 are both arranged along the axial direction of the second cavity 7. The compressed air inlet pipe 5 and the compressed air outlet pipe 6 are connected to the circumferential surface of the second cavity 7. Compressed air enters from the circumferential side of the second cavity 7 and comes into contact with the enlarged area of ​​the heat exchange module and the cooling module, exchanging heat.

[0035] Example 3

[0036] This embodiment takes a centrifugal air compressor with three-stage compression as an example. The waste heat recovery system includes three compression units connected in series, heat exchange pipes, and cooling pipes. A dual-core heat exchanger is installed after each of the first, second, and third-stage compression units. The heat exchange pipes are connected to the heat-using system and are divided into a heat exchange inlet main pipe 81 and a heat exchange outlet main pipe 82. The heat exchange inlet main pipe 81 is connected to the low-temperature water inlet 21 of each dual-core heat exchanger heat exchange module 2, and the heat exchange outlet main pipe 82 is connected to the high-temperature water outlet 22 of each dual-core heat exchanger heat exchange module 2. A first regulating valve 23 is provided at the high-temperature water outlet 22.

[0037] The cooling pipe is connected to the cooling tower. The cooling pipe is divided into a cooling water inlet main pipe 91 and a cooling water outlet main pipe 92. The cooling water inlet main pipe 91 is connected to the cooling water inlet 31 of each dual-core heat exchanger cooling module 3. The cooling water outlet main pipe 92 is connected to the cooling water outlet 32 ​​of each dual-core heat exchanger cooling module 3. A second regulating valve 33 is provided at the cooling water outlet 32.

[0038] like Figure 3 As shown, the thick black lines represent compressed air, the blue lines represent cooling water (usually 32°C inlet, 40°C outlet, cooled by a cooling tower), and the yellow and red lines represent hot water (92°C hot water output can be achieved by controlling the water flow through a regulating valve).

[0039] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A dual-core heat exchanger, characterized in that: The device includes a cavity, within which a heat exchange module and a cooling module are arranged side-by-side, with the upper and lower sides of the heat exchange module and cooling module abutting against the cavity via sealing strips. The heat exchange module includes several first heat-conducting plates and heat-conducting pipes, with the heat-conducting pipes passing through the spaces between the first heat-conducting plates. The cooling module includes several second heat-conducting plates and cooling pipes, with the cooling pipes passing through the spaces between the second heat-conducting plates. A compressed air inlet pipe is connected to the side of the cavity closest to the heat exchange module, and a compressed air outlet pipe is connected to the side of the cavity closest to the cooling module.

2. A dual-core heat exchanger as described in claim 1, characterized in that: The heat pipe is equipped with a low-temperature water inlet and a high-temperature water outlet, and the cooling pipe is equipped with a cooling water inlet and a cooling water outlet.

3. A dual-core heat exchanger as described in claim 1, characterized in that: The cavity has a rectangular parallelepiped structure, and the heat exchange module and the cooling module are arranged along the length of the cavity, and the two are parallel to the sidewalls corresponding to the long side of the cavity.

4. A dual-core heat exchanger as described in claim 1, characterized in that: The cavity is a cylindrical structure, with the heat exchange module and cooling module arranged along the axial direction of the cavity. The compressed air inlet pipe and compressed air outlet pipe are connected to the circumferential surface of the cavity.

5. A dual-core heat exchanger as described in claim 1, characterized in that: Both the compressed air inlet pipe and the compressed air outlet pipe are connected to the cavity via arc-shaped elbows.

6. A centrifugal air compressor waste heat recovery system comprising a dual-core heat exchanger as described in any one of claims 1 to 5, comprising multiple compression units, heat exchange pipes, and cooling pipes connected in series; characterized in that: Each compression unit is followed by a dual-core heat exchanger, with heat exchange pipes connecting the heat exchange modules of each dual-core heat exchanger and cooling pipes connecting the cooling modules of each dual-core heat exchanger.

7. The centrifugal air compressor waste heat recovery system as described in claim 6, characterized in that: The heat exchange pipeline is divided into a heat exchange inlet main pipe and a heat exchange outlet main pipe. The heat exchange inlet main pipe is connected to the low temperature water inlet of each dual-core heat exchanger module, and the heat exchange outlet main pipe is connected to the high temperature water outlet of each dual-core heat exchanger module. A first regulating valve is provided at the high temperature water outlet.

8. The centrifugal air compressor waste heat recovery system as described in claim 6, characterized in that: The cooling pipeline is divided into a cooling water inlet main pipe and a cooling water outlet main pipe. The cooling water inlet main pipe is connected to the cooling water inlet of each dual-core heat exchanger cooling module, and the cooling water outlet main pipe is connected to the cooling water outlet of each dual-core heat exchanger cooling module. A second regulating valve is provided at the cooling water outlet.

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