A compact heat exchanger and a method for producing the same

Abstract

The application discloses a compact heat exchanger and a production method thereof. The compact heat exchanger comprises first heat exchange plates and second heat exchange plates which are staggered and stacked. The surface of the first heat exchange plate is provided with first channels for flowing a first fluid. The surface of the second heat exchange plate is provided with second channels and third channels which are staggered and distributed. The second channels are used for flowing the first fluid, and the third channels are used for flowing a second fluid. The first channels are communicated with the second channels, so that the periphery of the third channels for flowing the second fluid is surrounded by the first channels and the second channels for flowing the first fluid. The arrangement can make the first fluid channels be distributed in the up, down, left and right of the second fluid channels, and the second fluid channels are surrounded by the first fluid channels. The heat conduction direction of the first fluid and the second fluid is doubled, so that the heat flow density of heat exchange can be increased, the heat exchange efficiency can be improved, and the heat exchange uniformity can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a compact heat exchanger and a production method thereof. BACKGROUND

[0002] For heat exchange equipment in the fields of solar thermal power generation, nuclear power, compressed air energy storage, etc., a tube-shell heat exchanger is usually used to realize heat exchange between molten salt and high-pressure steam water or gas. In order to meet the requirements of pressure resistance, temperature resistance, low flow resistance and high heat exchange efficiency of the heat exchanger, the tube-shell heat exchanger designed and manufactured is usually large in size, high in metal consumption and low in heat exchange efficiency, and the cost is difficult to reduce. Compared with the tube-shell heat exchanger, the flow channel of the compact heat exchanger is small, the boundary layer thickness is small, and the pressure bearing capacity is stronger, and the heat exchange wall thickness can be designed to be thinner, thereby reducing the heat transfer thermal resistance and improving the heat exchange efficiency.

[0003] The heat exchanger core 1 in the existing compact heat exchanger is usually formed by alternately stacking first plate bodies and second plate bodies, a gas flow channel is arranged on the surface of the first plate body, and a liquid flow channel is arranged on the surface of the second plate body. The gas and the liquid flow through the surfaces of the first plate body and the second plate body respectively and exchange heat.

[0004] The heat exchange efficiency of the compact heat exchanger is not high enough, and a scheme is needed to further improve the heat exchange efficiency of the compact heat exchanger. SUMMARY

[0005] The present application provides a compact heat exchanger and a production method thereof, which improves the heat exchange efficiency of the compact heat exchanger by improving the structure of the heat exchanger core.

[0006] The first aspect of the present application provides a compact heat exchanger, comprising first heat exchange plates and second heat exchange plates which are stacked alternately; a first channel for flowing a first fluid is arranged on the surface of the first heat exchange plate; a second channel and a third channel which are distributed alternately are arranged on the surface of the second heat exchange plate, the second channel is used for flowing the first fluid, and the third channel is used for flowing a second fluid; wherein the first channel is in communication with the second channel, so that the third channel for flowing the second fluid is surrounded by the first channel and the second channel for flowing the first fluid.

[0007] In some embodiments, the first channel is in communication with the second channel through a through hole opened on the surface of the second heat exchange plate.

[0008] In some embodiments, a first through hole is arranged at the first end in the length direction of the second heat exchange plate, and a second through hole is arranged at the second end in the length direction of the second heat exchange plate.

[0009] In some embodiments, each side hole on the second heat exchange plate is located on a corresponding side cross section, and a fin array is arranged in the flow channel between the first heat exchange plate and the second heat exchange plate in a heat exchange region including the cross section; one end of each fin in the fin array is connected to the surface of the first heat exchange plate, and the other end is connected to the surface of the second heat exchange plate.

[0010] In some embodiments, the first heat exchange plate and the second heat exchange plate are planar plates.

[0011] In some embodiments, the second channel and the third channel are linear along the length direction of the compact heat exchanger; and the first channel is linear, curved or zigzag distributed on the surface of the first heat exchange plate.

[0012] In some embodiments, side plates are arranged on both sides of the width direction of the second heat exchange plate, the height of the side plate is the same as the depth of the second channel and the third channel; and cover plates are arranged on both sides of the stacking direction of the first heat exchange plate and the second heat exchange plate.

[0013] In some embodiments, the first heat exchange plate and the second heat exchange plate are curved cylindrical with a cross section in the shape of a ring.

[0014] In some embodiments, the center of the compact heat exchanger is a hollow pipe for flowing the first fluid or the second fluid; in the case of flowing the first fluid, the outer layer adjacent to the hollow pipe is the second heat exchange plate; in the case of flowing the second fluid, the outer layer adjacent to the hollow pipe is the first heat exchange plate.

[0015] In some embodiments, a reinforcing column is arranged inside the hollow pipe. The cross section of the reinforcing column is in the shape of a streamlined wing, or in the shape of a circle, a rectangle, etc.

[0016] In some embodiments, a heat insulation cylinder is arranged outside the outermost layer of the first heat exchange plate and the second heat exchange plate stacked alternately, and a heat preservation layer is arranged inside the heat insulation cylinder.

[0017] In some embodiments, the second channel and the third channel are linear along the length direction of the compact heat exchanger; and the first channel is in the shape of a spiral coiled around the first heat exchange plate.

[0018] In some embodiments, the first channel is formed by a first groove on the surface of the first heat exchange plate and the surface of the adjacent second heat exchange plate; the second channel is formed by a second groove on the surface of the second heat exchange plate and the surface of the adjacent first heat exchange plate; and the third channel is formed by a third groove on the surface of the second heat exchange plate and the surface of the adjacent first heat exchange plate.

[0019] In some embodiments, the compact heat exchanger is linear, and first and second end covers are respectively arranged at two ends of the compact heat exchanger, and inlet and outlet pipes for flowing the second fluid are respectively arranged on the first and second end covers; and a flow guide structure is arranged in the first and second end covers to make the flow direction of the second fluid from the middle of the process of flowing into and out of the compact heat exchanger generally linear.

[0020] In some embodiments, third and fourth end covers are respectively arranged at two ends of the linear compact heat exchanger; in the case that the first and second heat exchange plates are planar plates, the third and fourth end covers are respectively located at two sides of the compact heat exchanger; and in the case that the first and second heat exchange plates are curved cylindrical plates with a ring-shaped cross section, the third and fourth end covers are located at the same side or different sides of the compact heat exchanger.

[0021] In some embodiments, the first and second channels are used for flowing gaseous fluid, and the third channel is used for flowing liquid fluid.

[0022] The second aspect of the present specification provides a production method of a compact heat exchanger, comprising: etching first flow channels on a plurality of first plate bodies respectively; machining second flow channels and third flow channels on a plurality of second plate bodies, and arranging through holes at two ends of the second flow channels; and stacking and welding the plurality of first plate bodies and the plurality of second plate bodies alternately together, so that the first flow channels and the surfaces of the adjacent second plate bodies form first channels for flowing a first fluid, the second flow channels and the surfaces of the adjacent first plate bodies form second channels for flowing a second fluid, the third flow channels and the adjacent first plate bodies form third channels for flowing a third fluid, and the first channels and the second channels communicate through the through holes.

[0023] In some embodiments, while the first flow channels are etched on the plurality of first plate bodies, fin array regions are etched at two ends of the first flow channels respectively, the fin array regions are recessed regions communicating with the first flow channels, and a plurality of fins are distributed in the recessed regions; and when the first plate bodies and the second plate bodies are stacked and welded together alternately, the positions of the fin array regions correspond to the positions of the through holes on the second plate bodies.

[0024] In some embodiments, the first, second and third flow channels are arranged in positions such that the second channels communicate with the first channels after the first plate bodies and the second plate bodies are stacked and welded together alternately.

[0025] In some embodiments, when the first heat exchange plate and the second heat exchange plate are planar plate-shaped, the first plate body and the second plate body are stacked and welded together by using a diffusion welding process; when the first heat exchange plate and the second heat exchange plate are curved cylindrical with a cross section in the shape of a ring, and the pressure of the first fluid and the second fluid is less than a preset pressure threshold, the first plate body and the second plate body are stacked and welded together by using a brazing process; when the first heat exchange plate and the second heat exchange plate are curved cylindrical with a cross section in the shape of a ring, and the pressure of the first fluid and the second fluid is greater than the preset pressure threshold, the first plate body and the second plate body are stacked and welded together by using a diffusion welding process.

[0026] In some embodiments, when the first heat exchange plate and the second heat exchange plate are curved cylindrical with a cross section in the shape of a ring, the interleaved stacking and welding of the plurality of first plate bodies and the plurality of second plate bodies together comprises: interleaved stacking and welding of the hollow pipe with the first plate bodies and the second plate bodies together, wherein the hollow pipe is located inside each first plate body and each second plate body.

[0027] The compact heat exchanger and the production method thereof provided in the present specification, since the second channels for flowing the first fluid and the third channels for flowing the second fluid are alternately distributed on the surface of the second heat exchange plate, the first fluid channels (i.e., the channels for flowing the first fluid) are arranged on the left and right of the second fluid channels (i.e., the channels for flowing the second fluid); since the first heat exchange plate and the second heat exchange plate are alternately stacked, and the surface of the first heat exchange plate is provided with the first channels for flowing the first fluid, the first fluid channels are also arranged above and below the second fluid channels. As can be seen, in the compact heat exchanger provided in the present specification, the first fluid channels are distributed on the up, down, left and right of the second fluid channels, the second fluid channels are surrounded by the first fluid channels, the heat conduction direction of the first fluid and the second fluid is doubled, thereby being able to increase the heat flux density of heat exchange, improve the heat exchange efficiency, and improve the heat exchange uniformity.

[0028] Reference will now be made in detail to certain embodiments of the application, examples of which are illustrated in the accompanying drawings. While the application will be described in conjunction with the attached drawings, it will be understood that the present description is not intended to limit the scope of the application to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents, as can be included within the spirit and scope of the application as defined by the appended claims. Furthermore, in the following detailed description of embodiments of the application, numerous specific details are set forth in order to provide a thorough understanding of the application. However, it will be recognized by one of ordinary skill in the art that the various embodiments of the application can be practiced without these specific details. In other instances, well known methods have not been described in detail in order not to unnecessarily obscure aspects of the application. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, although the drawings represent possible implementations, the drawings are not necessarily to scale and certain features can have been exaggerated or minimized. A person skilled in the art would recognize that various configurations can exist, and the configurations shown in the drawings have been presented for the purpose of explanation only.

[0030] Figure 1 A-A cross-sectional view of a compact heat exchanger according to the present disclosure;

[0031] Figure 2 A top view of a first heat exchange plate in a compact heat exchanger according to the present disclosure;

[0032] Figure 3 A top view of a second heat exchange plate in a compact heat exchanger according to the present disclosure;

[0033] Figure 4 B-B cross-sectional view of a compact heat exchanger according to the present disclosure;

[0034] Figure 5 Cross-sectional view of a fin array;

[0035] Figure 6 Schematic view of a reinforcing column inside a hollow duct;

[0036] Figure 7 End view of a compact heat exchanger according to the present disclosure in the length direction of the heat exchanger core;

[0037] Figure 8 End view of a compact heat exchanger according to the present disclosure in the width direction of the heat exchanger core;

[0038] Figure 9 Flowchart of a production method of a compact heat exchanger according to the present disclosure.

[0039] Reference numerals of the above drawings: 10 - first heat exchange plate, 11 - first channel, 12 - opening, 20 - second heat exchange plate, 21 - second channel, 22 - third channel, 23 - fin, 24 - through hole, 241 - first through hole, 242 - second through hole, 25 - edge plate, 30 - fin, 41 - first cover plate, 42 - second cover plate, 51 - first end cap, 52 - second end cap, 61 - third end cap, 62 - fourth end cap, X - heat exchange area including the cross-section, Y - hollow duct, M - reinforcing column. DETAILED DESCRIPTION

[0040] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] This specification provides a compact heat exchanger, such as Figure 1 , Figure 2 and Figure 3 As shown, the compact heat exchanger includes a first heat exchange plate 10 and a second heat exchange plate 20 stacked in an alternating manner. The surface of the first heat exchange plate 10 is provided with a first channel 11 for the flow of a first fluid, and the surface of the second heat exchange plate 20 is provided with a second channel 21 and a third channel 22 distributed in an alternating manner. The second channel 21 is used for the flow of the first fluid, and the third channel 22 is used for the flow of the second fluid.

[0043] The first channel 11 is connected to the second channel 21, so that the "around" of the third channel 22 used for the flow of the second fluid is used to surround the first channel 11 and the second channel 21 for the flow of the first fluid.

[0044] like Figure 1As shown, since the second channels 21 for flowing the first fluid and the third channels 22 for flowing the second fluid are alternately arranged on the surface of the second heat exchange plate 20, the first fluid channels (i.e. the channels for flowing the first fluid) are arranged on the left and right of the second fluid channels (i.e. the channels for flowing the second fluid); since the first heat exchange plate 10 and the second heat exchange plate 20 are alternately stacked, and the surface of the first heat exchange plate 10 is provided with the first channels 11 for flowing the first fluid, the first fluid channels are also arranged on the upper and lower of the second fluid channels. Thus, in the compact heat exchanger provided in the present specification, the first fluid channels are arranged on the upper, lower, left and right of the second fluid channels, the second fluid channels are surrounded by the first fluid channels, the heat conduction direction of the first fluid and the second fluid is doubled, thereby increasing the heat flux density of heat exchange, improving the heat exchange efficiency, and improving the heat exchange uniformity.

[0045] The first heat exchange plate 10 and the second heat exchange plate 20 alternately stacked form a heat exchanger core of the compact heat exchanger.

[0046] The first channel 11 is formed by a first groove on the surface of the first heat exchange plate 10 and the surface of the adjacent second heat exchange plate 20; the second channel 21 is formed by a second groove on the surface of the second heat exchange plate 20 and the surface of the adjacent first heat exchange plate 10; and the third channel 22 is formed by a third groove on the surface of the second heat exchange plate 20 and the surface of the adjacent first heat exchange plate 10.

[0047] The first groove can be a micro fluid channel prepared on the surface of the first heat exchange plate 10 by chemical etching; and the second groove and the third groove can be prepared on the surface of the second heat exchange plate 20 by mechanical processing or chemical etching.

[0048] The first heat exchange plate 10 and the second heat exchange plate 20 can be made of stainless steel. The stainless steel has high mechanical strength, good thermal conductivity, and is not easy to rust.

[0049] The thickness of the first heat exchange plate 10 is less than the thickness of the second heat exchange plate 20, so that the gas in the first channel 11 on the first heat exchange plate 10 can be more efficiently heat-exchanged. Specifically, the thickness of the second heat exchange plate 20 can be 3-5 times the thickness of the first heat exchange plate 10.

[0050] The first channel 11 on the surface of the first heat exchange plate 10 and the second channel 21 on the surface of the second heat exchange plate 20 are small-size channels, and the third channel 22 on the surface of the second heat exchange plate 10 is a large-size channel. The heat exchanger core structure scheme of combining a large-size liquid flow channel with a small-size gas flow channel can reduce the liquid side fluid resistance and the flow resistance increase phenomenon caused by corrosive fouling of the flow channel while maintaining the compactness of the heat exchanger, and reduce the risk of flow channel blockage.

[0051] The width of the second channel 21 on the surface of the second heat exchange plate 20 (i.e. the opening width of the second channel) can be approximately equal to the thickness of the first heat exchange plate 10, for example, the width of the second channel 21 (i.e. the opening width of the second channel) is 0.8-1.2 times the thickness of the first heat exchange plate 10. The smaller width of the second channel 21 enables more second fluid channels to be arranged on the second heat exchange plate 20, thereby ensuring the heat exchange flow of the second fluid channels.

[0052] The depths of the second channel 21 and the third channel 22 on the surface of the second heat exchange plate 20 can be the same, with the difference being the width.

[0053] The second channel 21 and the third channel 22 on the surface of the second heat exchange plate 20 are separated by the fins 23. The second channel 21 and the third channel 22 can be obtained by mechanical cutting, so that the fins 23 are integral with the other parts of the second heat exchange plate 20, thereby improving the sealing of the second channel 21 and the third channel 22.

[0054] The cross section of the second channel 21 and the third channel 22 on the surface of the second heat exchange plate 20 can be rectangular. The depth of the second channel 21 can be more than 2 times the width.

[0055] The first channel 11 and the second channel 21 are used to flow gaseous fluid, and the third channel 22 is used to flow liquid fluid, i.e. the first fluid can be gaseous fluid such as air, carbon dioxide, water vapor, etc., and the second fluid can be liquid fluid such as molten salt, etc.

[0056] In some embodiments, the first channel 11 and the second channel 21 are communicated through the through hole 24 opened on the surface of the second heat exchange plate 20. The through hole 24 can be arranged at any position in the length direction of the second heat exchange plate 20. Further, in some embodiments, a first through hole 241 is arranged at the first end in the length direction of the second heat exchange plate 20, and a second through hole 242 is arranged at the second end in the length direction of the second heat exchange plate 20. Arranging the through holes at both ends in the length direction enables the second channel 21 to be relatively long and have good flowability, thereby improving the heat exchange efficiency.

[0057] In some embodiments, as shown in Figure 3 and Figure 4 Each side through hole on the second heat exchange plate 20 is located on the corresponding cross section, and in the heat exchange region X including the cross section, the flow passages of the first heat exchange plate 10 and the second heat exchange plate 20 are provided with an array of fins. Figure 5 is a schematic view of the cross section of the array of fins. One end of each fin 30 in the array of fins is connected to the surface of the first heat exchange plate 10, and the other end is connected to the surface of the second heat exchange plate 20.

[0058] Each side through hole on the second heat exchange plate 20 can be located on multiple (e.g. two or three) cross sections

[0059] In some embodiments, in order to maximize the length of the second channel 21 to maximize the improvement of heat exchange efficiency, the through holes on one side of the second heat exchange plate 20 are located on the first cross section, and the through holes on the other side are located on the second cross section, that is, the through holes on the same side are located on the same cross section.

[0060] In a compact heat exchanger for heat exchange between a corrosive liquid (such as molten salt) and a high-pressure gas, it is generally not provided with multiple through holes on the surface of the plate body, especially not provided with multiple through holes on one cross section. Mainly because in the case of multiple through holes, the connection area between the first heat exchange plate 10 and the second heat exchange plate 20 is reduced, and under the high pressure of the gas, the connection strength between the first heat exchange plate 10 and the second heat exchange plate 20 is reduced, which is easy to cause gas leakage.

[0061] To solve this problem, the compact heat exchanger provided in the specification is provided with fins near the cross section, which can on the one hand strengthen the heat exchange strength of the first heat exchange plate 10 and the second heat exchange plate 20 at both ends of the length, reduce the risk of gas leakage, and on the other hand increase the heat exchange area and generate turbulence to strengthen the heat exchange.

[0062] The "heat exchange area X including the cross section" refers to a section of the heat exchanger core structure including the cross section in the length direction of the second heat exchange plate 20 or the compact heat exchanger.

[0063] The cross section of the fin (that is, the surface parallel to the surface of the first heat exchange plate 10 and the second heat exchange plate 20, or the surface parallel to the direction of gas flow) can be one or more of a circular shape, a rectangular shape, and a streamlined wing shape. The streamlined wing-shaped fin design can reduce the resistance to fluid and also reduce the impact force of the airflow on the fin to ensure the connection strength between the first heat exchange plate 10 and the second heat exchange plate 20.

[0064] In some embodiments, the first heat exchange plate 10 and the second heat exchange plate 20 can be a flat plate as shown in Figure 1 , Figure 4 .

[0065] The second channel 21 and the third channel 22 are straight lines in the length direction of the compact heat exchanger, that is, the fluid does not need to change the flow direction in the heat exchanger core, so that the flow resistance of the viscous fluid is small and the flowability is relatively good. The second channel 21 and the third channel 22 are parallel.

[0066] The first channel 11 can be distributed in a straight line, a curve, or a polyline on the surface of the first heat exchange plate 10. Although Figure 1 and Figure 4The first channel 11 shown in the middle appears to be in parallel relationship with the second channel 21 and the third channel 22, but the first channel 11 is not related to the second channel 21 and the third channel 22 in terms of direction and layout. The direction and layout of the first channel 11 can be as long as the surface of the plate body is covered.

[0067] In the case of the first heat exchange plate 10 and the second heat exchange plate 20 being planar, two sides of the second heat exchange plate 20 in the width direction are provided with side plates 25, and the height of the side plates is the same as the depth of the second channel 21 and the third channel 22. The side plates are used to improve the mechanical strength of the second heat exchange plate 20 and the overall heat exchanger core, to improve the pressure-bearing level of the heat exchanger core, and can also serve as a connecting bridge between the heat exchanger core and the shell and head of the compact heat exchanger, and provide a welding point.

[0068] The side plates 25 and the second heat exchange plate 20 can be integrally formed, that is, when the second channel 21 and the third channel 22 are formed in an interlaced manner on a plate body, a distance is left on both sides of the plate body in the width direction without any channels, and the integrally formed side plates 25 can be formed.

[0069] The side plates 25 and the second heat exchange plate 20 can also be separate, that is, when the second channel 21 and the third channel 22 are formed in an interlaced manner on a plate body, the channels are arranged to the two sides of the plate body, and the side plates 25 can be additionally welded on both sides of the plate body in the width direction.

[0070] Cover plates are provided on both sides of the first heat exchange plate 10 and the second heat exchange plate 20 in the stacking direction, such as the first cover plate 41 and the second cover plate 42 in Figure 1 and Figure 4 The first cover plate 41 and the second cover plate 42 can further improve the mechanical strength of the overall heat exchanger core and the pressure-bearing level of the heat exchanger core.

[0071] In some embodiments, the first heat exchange plate 10 and the second heat exchange plate 20 are curved cylindrical with a cross-section in the shape of a ring. In this case, the center of the compact heat exchanger can be a solid column or a hollow pipe, and the hollow pipe can be used to flow the first fluid or the second fluid.

[0072] By setting the center of the compact heat exchanger as a hollow pipe to flow the first fluid or the second fluid, the internal space of the cylindrical compact heat exchanger can be fully utilized, and the heat exchange flow and efficiency of the compact heat exchanger can be improved.

[0073] In the case of the hollow pipe being used to flow the second fluid, the outer layer adjacent to the hollow pipe is the first heat exchange plate. In the case of the hollow pipe being used to flow the first fluid, the outer layer adjacent to the hollow pipe is the second heat exchange plate.

[0074] In the case where the hollow pipe is used for flowing the first fluid, in order to improve the pressure-bearing level of the whole heat exchanger core, as shown in Figure 6 The hollow pipe Y can be provided with a plurality of reinforcing columns M inside, the reinforcing columns M can be perpendicular or not perpendicular to the axis of the hollow pipe, and the plurality of reinforcing columns M can be arranged in parallel or not in parallel. The cross section of the reinforcing column M is in the shape of a streamlined wing, wherein the cross section of the reinforcing column M is parallel to the axis of the hollow pipe Y.

[0075] The design of the reinforcing column can improve the pressure-bearing level of the whole heat exchanger core and avoid the deformation of the pipe and the heat exchanger core due to extrusion, thereby preventing fluid leakage. The streamlined wing-shaped reinforcing column can reduce the resistance to the forward movement of the fluid and enhance the heat exchange efficiency between the fluid in the hollow pipe and the outer plate body.

[0076] In some embodiments, the outermost layer of the first heat exchange plate 10 and the second heat exchange plate 20 arranged in a staggered stack is provided with a heat insulation cylinder, and the inside of the heat insulation cylinder is provided with a heat preservation layer, which can include heat insulation cotton, heat reflective coating, etc. By arranging the heat preservation layer, the heat loss of the high-temperature fluid can be reduced, so that most of the heat is used for heat exchange, thereby improving the heat exchange efficiency.

[0077] In some embodiments, when the first heat exchange plate 10 and the second heat exchange plate 20 are in the shape of a curved cylindrical tube with a ring-shaped cross section, the second channel 21 and the third channel 22 are in a straight line along the length direction of the compact heat exchanger; and the first channel is in the shape of a spiral winding around the first heat exchange plate. The first channel can be wound on the inside or outside of the cylindrical first heat exchange plate.

[0078] By arranging the first channel in the shape of a spiral, the first channel can be closely distributed, the distribution density of the first channel can be improved, the heat exchange area of the first channel and the third channel can be increased, thereby making the heat exchange more sufficient and improving the heat exchange efficiency; and the uniformity of heat exchange can also be improved.

[0079] In some embodiments, the compact heat exchanger is in a straight line, and the first end cover 51 and the second end cover 52 are arranged at the two ends of the straight-line heat exchanger respectively. The first end cover 51 and the second end cover 52 are respectively provided with inlet and outlet pipes for flowing the second fluid. The first end cover 51 and the second end cover 52 are provided with flow guide structures inside, so that the flow direction of the second fluid is in a straight line as a whole during the process of flowing into and out of the compact heat exchanger. That is, the flow guide structure does not change the overall flow direction of the fluid, but only plays a role of fluid convergence.

[0080] In some embodiments, the third end cover 61 and the fourth end cover 62 are respectively arranged at two ends of the compact heat exchanger. The third end cover 61 and the fourth end cover 62 are respectively arranged at two sides of the compact heat exchanger and can be centrally symmetric about the center of the heat exchanger core. In the case that the first heat exchange plate 10 and the second heat exchange plate 20 are curved and cylindrical with a cross-section in the shape of a ring, the third end cover 61 and the fourth end cover 62 are arranged at the same side or different sides of the compact heat exchanger, which mainly depends on the winding density (i.e., the spacing between adjacent first channels 11) and the inclination angle (i.e., the angle between the first channel 11 and the circumference) of the winding.

[0081] Figure 7 FIG. 1 is a schematic view of an end surface of a heat exchanger core of a compact heat exchanger in the length direction of the heat exchanger core; Figure 8 FIG. 2 is a schematic view of an end surface of a heat exchanger core of a compact heat exchanger in the width direction of the heat exchanger core, wherein 12 represents an opening of the fin array region towards the third end cover 61 or the fourth end cover 62.

[0082] FIG. 3 shows a compact heat exchanger according to the present application. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 FIG. 3 shows a compact heat exchanger according to the present application, which is used for heat exchange between gas and liquid. The first channel 11 and the second channel 21 are used for flowing high-pressure gas, and the third channel 22 is used for flowing viscous liquid. The high-pressure gas has two transmission channels:

[0083] Channel 1: third end cover 61 -> opening 12 -> fin array region -> first through hole 241 -> second channel 21 -> second through hole 242 -> fin array region -> opening 12 -> fourth end cover 62;

[0084] Channel 2: third end cover 61 -> opening 12 -> fin array region -> first channel 11 -> fin array region -> opening 12 -> fourth end cover 62.

[0085] The present specification also provides a production method of a compact heat exchanger, which can be used to produce the compact heat exchanger described above. As shown in FIG. 4, the method comprises the following S10 to S30. Figure 9

[0086] S10: etching first flow channels on a plurality of first plate bodies.

[0087] The first plate body can be a stainless steel plate body with a relatively small thickness.

[0088] S20: machining second flow channels and third flow channels on a plurality of second plate bodies, and arranging through holes at two ends of the second flow channels.

[0089] ​The second plate body can be a stainless steel plate body with relatively large thickness. The second flow channel and the third flow channel can be processed by mechanical processing or chemical etching.

[0090] S30: Stacking and welding the plurality of first plate bodies and the plurality of second plate bodies alternately to form a first channel for flowing the first fluid between the first flow channel and the surface of the adjacent second plate body, a second channel for flowing the second fluid between the second flow channel and the surface of the adjacent first plate body, and a third channel for flowing the third fluid between the third flow channel and the adjacent first plate body, and the first channel and the second channel communicate with the through hole.

[0091] The first plate body is used as a first heat exchange plate after the processing operation, and the second plate body is used as a second heat exchange plate after the processing operation.

[0092] In some embodiments, the first flow channel, the second flow channel, and the third flow channel are arranged in a manner that the second channel communicates with the first channel after the plurality of first plate bodies and the plurality of second plate bodies are stacked and welded alternately. That is, the width and spacing of the first flow channel, the second flow channel, and the third flow channel are specially arranged, and the first plate body and the second plate body need to be specially aligned to enable the through hole on the second plate body to communicate with the first channel. If the through hole on the second plate body is located between two first channels, the through hole cannot communicate with the first channel and the second channel.

[0093] In some embodiments, the first flow channel is etched on the plurality of first plate bodies, and a fin array region is etched at both ends of the first flow channel. The fin array region is a recessed region communicating with the first flow channel, and a plurality of fins are distributed in the recessed region. The fin array region is the "heat exchange region X including a cross section" mentioned above.

[0094] When the first plate body and the second plate body are stacked and welded alternately, the position of the fin array region corresponds to the position of the through hole on the second plate body, so that the first channel and the second channel can be easily communicated without special arrangement of the width and spacing of the first flow channel, the second flow channel, and the third flow channel, and without special alignment of the first plate body and the second plate body.

[0095] In some embodiments, when the first heat exchange plate and the second heat exchange plate are planar plates, the first plate body and the second plate body are stacked and welded by diffusion welding process; when the first heat exchange plate and the second heat exchange plate are curved cylindrical plates with a ring-shaped cross section and the pressure of the first fluid and the second fluid is less than a preset pressure threshold, the first plate body and the second plate body are stacked and welded by brazing process; and when the first heat exchange plate and the second heat exchange plate are curved cylindrical plates with a ring-shaped cross section and the pressure of the first fluid and the second fluid is greater than the preset pressure threshold, the first plate body and the second plate body are stacked and welded by diffusion welding process.

[0096] The preset pressure threshold can be 10 MPa.

[0097] In some embodiments, in the case that the first heat exchange plate and the second heat exchange plate are curved cylindrical with a cross-section in the shape of a ring, the interleaved welding of the plurality of first plate bodies and the plurality of second plate bodies together comprises: interleaved welding of the hollow pipe with the first plate bodies and the second plate bodies together, wherein the hollow pipe is located inside each first plate body and each second plate body. That is, the hollow pipe is located in the innermost layer of the heat exchanger core.

[0098] The various embodiments described in the specification are described in progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0099] Any numerical value recited herein includes all values from the lower value and the upper value in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. As an example, if the value from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, is recited as a value for an amount of a component or a process variable (e.g., temperature, pressure, time, etc.), it is intended that values such as 15 to 85, 22 to 68, 43 to 51, and 30 to 32, etc., are expressly enumerated in this specification. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01, 0.1, as appropriate. These are only examples of what is specifically enumerated herein, and all possible combinations of numerical values between the lowest value and the highest value enumerated, are to be considered to be expressly stated in this application.

[0100] Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. "Approximately" or "about" when used in connection with a range applies to both the start and end of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0101] The phrase "consisting essentially of should include the elements, ingredients, components or steps identified, and such other elements ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to cover embodiments of the application that "consist essentially of the elements, ingredients, components or steps. By use of the term "may" herein, it is intended that any property so described can or can not be present.

[0102] Plural elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To the extent that any measurement is expressed as an "about" a tolerance of ±10% or 5% or 1%, or thereabout, should be assumed. The disclosure of "one" or "an" should be interpreted as "one or more" unless otherwise specifically noted. The use of the term "or" in the context of "A or B" can be interpreted as "A or B or both". The use of the term "about" can be construed as meaning "approximately", "around", "in the order of" or other similar expression referring to at least minor deviations or slight errors for the mean value. Thus, "about" can be construed as meaning "approximately", "around", "in the order of" or other similar expression referring to at least minor deviations or slight errors for the mean value.

[0103] The above description is only several embodiments of the present application. Although the embodiments of the present application are disclosed as above, the content is only for the convenience of understanding the embodiments adopted by the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the form and details of the embodiments without departing from the spirit and scope of the present application. The patent protection scope of the present application should be determined by the scope defined in the appended claims.

Claims

1. A compact heat exchanger, characterized by The first heat exchange plate and the second heat exchange plate are staggered and stacked; The surface of the first heat exchange plate is provided with a first channel for flowing the first fluid; The surface of the second heat exchange plate is provided with a second channel and a third channel staggered and distributed, the second channel is used for flowing the first fluid, and the third channel is used for flowing the second fluid; The first channel and the second channel are communicated, so that the third channel for flowing the second fluid is surrounded by the first channel and the second channel for flowing the first fluid; The first channel and the second channel are communicated through the through hole opened on the surface of the second heat exchange plate; Each side through hole on the second heat exchange plate is located on the corresponding side cross section, and a fin array is arranged in the flow channel between the first heat exchange plate and the second heat exchange plate in the heat exchange area including the cross section; One end of each fin in the fin array is connected to the surface of the first heat exchange plate, and the other end is connected to the surface of the second heat exchange plate.

2. The compact heat exchanger of claim 1, wherein The first heat exchange plate and the second heat exchange plate are planar plates.

3. The compact heat exchanger of claim 1, wherein The first heat exchange plate and the second heat exchange plate are curved cylindrical with cross section in ring shape.

4. The compact heat exchanger of claim 3, wherein The center of the compact heat exchanger is a hollow pipe for flowing the first fluid or the second fluid; In the case that the hollow pipe is used for flowing the first fluid, the outer layer adjacent to the hollow pipe is the second heat exchange plate; In the case that the hollow pipe is used for flowing the second fluid, the outer layer adjacent to the hollow pipe is the first heat exchange plate.

5. A method of producing a compact heat exchanger, characterized by, It comprises: First flow channels are etched on a plurality of first plate bodies respectively; Second flow channels and third flow channels are machined on a plurality of second plate bodies, and through holes are arranged at both ends of the second flow channels; The plurality of first plate bodies and the plurality of second plate bodies are staggered and stacked and welded together, so that the first flow channels and the surfaces of the adjacent second plate bodies form first channels for flowing the first fluid, the second flow channels and the surfaces of the adjacent first plate bodies form second channels for flowing the second fluid, the third flow channels and the adjacent first plate bodies form third channels for flowing the third fluid, and the first channels and the second channels are communicated through the through holes.

6. The method of claim 5, wherein, While etching the first flow channels on the plurality of first plate bodies, fin array regions are also etched at both ends of the first flow channels, the fin array regions are recessed regions communicated with the first flow channels, and a plurality of fins are distributed in the recessed regions; When the first plate bodies and the second plate bodies are staggered and stacked and welded together, the positions of the fin array regions correspond to the positions of the through holes on the second plate bodies.

7. The method of claim 5, wherein, The width and spacing of the first flow channels, the second flow channels and the third flow channels are arranged so that the second channels are communicated with the first channels after the first plate bodies and the second plate bodies are staggered and stacked and welded together.

8. The method of claim 5, wherein, In the case that the first heat exchange plate and the second heat exchange plate are curved cylindrical with cross section in ring shape, the staggered and stacked welding of the plurality of first plate bodies and the plurality of second plate bodies comprises: The hollow pipe is staggered and stacked and welded with the first plate bodies and the second plate bodies, and the hollow pipe is located in the interior of each first plate body and each second plate body.

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