Microchannel phase change heat exchanger

Abstract

The application provides a micro-channel phase change heat exchanger, comprising: a shell; a heat exchange core body comprising a cold side heat exchange plate and a hot side heat exchange plate, the cold side heat exchange plate being provided with a plurality of cold side channels, and the hot side heat exchange plate being provided with a plurality of hot side channels, the cold side channels comprising straight channels and curved channels connected in sequence; wherein the curved channels comprise first channels and second channels arranged alternately, the curved channels comprise two auxiliary flow curved channels close to two sides of the heat exchange core body respectively, and water guide structures are arranged on the first channels and the second channels in at least partially continuous adjacent curved channels from at least one of the two auxiliary flow curved channels; at least one side of the heat exchange core body is provided with a condensate header, one end of the condensate header is communicated with the corresponding auxiliary flow curved channel, and the other end is communicated with a condensate collecting cavity. The micro-channel phase change heat exchanger aims to solve the problem of low steam dryness at the steam outlet end of a PCHE in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship power technology, and in particular to a micro-channel phase change heat exchanger. BACKGROUND

[0002] The ship power system is an important part of the ship, and the heat exchanger is an important equipment of the ship power system. Compared with the land platform, the ship is limited by space and environment, and the requirements for the heat exchanger are more stringent, especially the comprehensive performance requirements such as compactness and reliability of the heat exchanger are significantly improved. The printed circuit board heat exchanger (PCHE) forms micro-channels in the metal plate by photochemical etching and other methods, and uses diffusion welding and other methods to weld the stacked plates to form a high-efficiency and compact heat exchange unit, which significantly reduces the volume and weight of the heat exchanger, has the advantages of high temperature resistance, corrosion resistance, large temperature range, long service life, etc. It is considered as one of the ideal heat exchangers for marine platform power systems such as ships, and is gradually widely used. At present, PCHE is mainly used for heat exchange processes without phase change on ships and other marine platforms. For the ship steam power system, the largest heat exchange equipment, such as the condenser and the steam generating device, is a phase change heat exchange equipment, which is also the largest heat exchange equipment in terms of volume and weight in the ship steam power system. The use of PCHE heat exchanger will significantly reduce the volume and weight and improve the safety and reliability. When PCHE is used for steam generating device of ship steam power system, the steam dryness at the outlet of PCHE needs to be improved to avoid the impact of too many liquid droplets on the steam pipe network and affect the safety and reliability of the steam pipe network and downstream steam turbine. Compared with conventional steam generating devices, the space of the steam generating device based on PCHE is more limited. How to realize the steam dehumidification of the phase change PCHE in the limited space is an important problem to be solved at present. SUMMARY

[0003] The present application provides a micro-channel phase change heat exchanger, which aims to solve the problem of low steam dryness at the outlet of PCHE in the prior art.

[0004] In view of the problems in the prior art, the present application provides a micro-channel phase change heat exchanger, which comprises:

[0005] A shell is provided with a cold side inlet, a cold side outlet, a hot side inlet, a hot side outlet and a condensate outlet, and a condensate collecting cavity is arranged in the shell, and the condensate outlet is in communication with the condensate collecting cavity;

[0006] The heat exchange core is arranged in the shell, and the heat exchange core comprises cold side heat exchange plates and hot side heat exchange plates which are stacked and arranged alternately along the height direction of the shell, the cold side heat exchange plate has a plurality of cold side channels, and the hot side heat exchange plate has a plurality of hot side channels; the cold side channel comprises a straight channel and a curved channel which are connected in sequence, the straight channel is communicated with the cold side inlet, the curved channel is communicated with the cold side outlet, and one end of the hot side channel is communicated with the hot side inlet and the other end is communicated with the hot side outlet.

[0007] The curved channel comprises first channels and second channels which are arranged alternately, the first channels and the second channels are arranged obliquely, the curved channel comprises two auxiliary flow curved channels which are close to two sides of the heat exchange core respectively, and the first channels and the second channels in at least partially continuous adjacent curved channels are provided with water guide structures from at least one of the two auxiliary flow curved channels, the water guide structures are arranged in the two side walls of the first channel or the second channel, and the extension direction of each water guide structure and the extension direction of the corresponding first channel or second channel form an acute angle.

[0008] At least one side of the heat exchange core is provided with a condensate header, one end of the condensate header is communicated with the corresponding auxiliary flow curved channel, and the other end is communicated with the condensate cavity.

[0009] According to the micro channel phase change heat exchanger provided by the application, the shell is further provided with a cyclone type steam-water separator, the cyclone type steam-water separator has a steam-water inlet, a steam outlet and a separated water outlet, the steam-water inlet is communicated with each cold side channel through a cold side outlet head, the steam outlet is communicated with the cold side outlet, and the separated water outlet is communicated with the condensate cavity through a condensate pipeline.

[0010] According to the micro channel phase change heat exchanger provided by the application, the cold side heat exchange plate comprises a first heat exchange plate and a second heat exchange plate which are connected to each other, the first heat exchange plate and the second heat exchange plate are arranged away from the middle part of the heat exchange core to the two sides of the heat exchange core gradually; the two sides of the heat exchange core are provided with condensate headers which are communicated with the corresponding auxiliary flow curved channels.

[0011] The first heat exchange plate and the second heat exchange plate are arranged in an integrated mode.

[0012] According to the micro channel phase change heat exchanger provided by the application, the cold side heat exchange plate at the lowermost end and the inner wall of the shell form the condensate cavity.

[0013] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0014] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0015] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0016] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0017] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0018] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0019] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0020] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate.

[0021] The micro-channel phase change heat exchanger provided by the application comprises a cold side heat exchange plate, a heat exchange core body and a hot side heat exchange plate. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0023] Figure 1 is a structural schematic diagram of a micro-channel phase change heat exchanger provided by the present application;

[0024] Figure 2 is a first cross-sectional view structural schematic diagram of Figure 1 ;

[0025] Figure 3 is a partial structural schematic diagram of Figure 2 ;

[0026] Figure 4 is a second cross-sectional view structural schematic diagram of Figure 1 .

[0027] Reference signs: 1: shell; 11: cold side inlet; 12: cold side outlet; 13: condensate water outlet; 14: condensate water collecting cavity; 15: cold side outlet end cover; 2: heat exchange core; 21: cold side heat exchange plate; 211: first heat exchange plate; 212: second heat exchange plate; 213: isolation band; 22: hot side heat exchange plate; 23: cold side channel; 231: straight channel; 232: curved channel; 2321: first channel; 2322: second channel; 2323: auxiliary flow curved channel; 24: hot side channel; 25: water guide structure; 251: water guide channel; 252: water guide cavity; 26: condensate water collecting pipe; 3: cyclone type steam-water separator; 31: steam-water inlet; 32: steam outlet; 33: separated water outlet; 34: condensate water pipeline; 35: trap valve. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0031] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "above" the second feature,

[0032] "above" and "above" can be that the first feature is directly above or obliquely above the second feature, or

[0033] only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0035] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described below in connection with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] The technical solutions of the present application will be described below in connection with the drawings in the present application. Figures 1-4 The present application provides a micro-channel phase change heat exchanger.

[0037] In view of the problem of low steam dryness at the steam outlet end of the PCHE in the prior art, the present application provides a micro-channel phase change heat exchanger, which comprises a shell 1 and a heat exchange core 2.

[0038] Please refer to Figure 1 The shell 1 is provided with a cold side inlet 11, a cold side outlet 12, a hot side inlet, a hot side outlet and a condensate outlet 13. The shell 1 is provided with a condensate collecting cavity 14, and the condensate outlet 13 is in communication with the condensate collecting cavity 14. It should be noted that the shell 1 is provided with a mounting cavity, which is arranged in a spaced manner with the condensate collecting cavity 14, and is used for mounting the heat exchange core 2.

[0039] The heat exchange core 2 comprises cold side heat exchange plates 21 and hot side heat exchange plates 22 which are stacked and arranged alternately along the height direction of the shell 1. The cold side heat exchange plate 21 is provided with a plurality of cold side channels 23, and the hot side heat exchange plate 22 is provided with a plurality of hot side channels 24. The cold side channel 23 comprises a straight channel 231 and a curved channel 232 which are connected in sequence. The straight channel 231 is in communication with the cold side inlet 11, and the curved channel 232 is in communication with the cold side outlet 12. One end of the hot side channel 24 is in communication with the hot side inlet, and the other end is in communication with the hot side outlet. The hot side channel 24 is in flow communication with a hot end fluid, and the cold side channel is in flow communication with a cold end fluid. The cold end fluid is heated by the hot end fluid to change from water to water vapor, and is discharged from the cold side outlet 12.

[0040] In the technical scheme provided by the present application, the curved channel 232 comprises first channels 2321 and second channels 2322 arranged alternately, and the first channels 2321 and the second channels 2322 are arranged obliquely to make the curved channel extend. The curved flow channels close to the two sides of the heat exchange core 2 are auxiliary curved channels 2323, and at least one of the first channels 2321 and the second channels 2322 in the at least partially continuous adjacent curved channels 232 is provided with a water guide structure 25 from the auxiliary curved channel 2323. It can be understood that, through the first channels 2321 and the second channels 2322 connected obliquely, the curved channel 232 can make the steam collide with the inclined surface to form droplets. If there is only one auxiliary curved channel 2323, the droplets in the adjacent other curved channels 232 can be sequentially collected into the auxiliary curved channel 2323 through the water guide structure 25 and then discharged through the auxiliary curved channel 2323. If there are two auxiliary curved channels 2323, the central axis of the heat exchange core 2 can be taken as a reference, and the droplets in the curved channels 232 on the two sides of the central axis can be collected to the two sides respectively and then discharged through the corresponding auxiliary curved channels 2323. The water guide structure 25 can be provided in as many continuous curved channels 232 as possible, so that the steam dryness is improved more effectively.

[0041] Specifically, the water guide structure 25 is arranged in the two side walls of the first channel 2321 or the second channel 2322, and the angle between the extension direction of each water guide structure 25 and the extension direction of the corresponding first channel 2321 or second channel 2322 is an acute angle, which is used to guide the condensed water to the corresponding auxiliary curved channel 2323 sequentially. It should be noted that, when the water guide structure 25 is arranged, it is necessary to consider which auxiliary curved channel 2323 the droplets in the curved channel 232 need to be guided to, and then the outlet of the water guide structure 25 is directed to which auxiliary curved channel 2323. On this basis, the angle between the extension direction of the water guide structure 25 and the extension direction of the corresponding first channel 2321 or second channel 2322 is an acute angle. Further, at least one side of the heat exchange core 2 is provided with a condensed water collecting pipe 26, one end of the condensed water collecting pipe 26 is communicated with the corresponding auxiliary curved channel 2323, and the other end is communicated with the condensed water collecting cavity 14. Through the condensed water collecting pipe 26, the condensed water in the corresponding auxiliary curved channel 2323 can be guided to the condensed water collecting cavity 14 and then discharged through the condensed water collecting cavity 14.

[0042] The micro-channel phase change heat exchanger provided by the application is provided with straight channels 231 and curved channels 232 in the cold side channel 23, the curved channels 232 include first channels 2321 and second channels 2322 connected in an inclined manner, and the preliminary separation of liquid drops can be realized through the inclined design. Further, through the arrangement of the water guide structure 25, the liquid drops in the middle channels can be guided to the condensate collecting pipes 26 at the side of the heat exchange core 2 and discharged, and the liquid drops are further separated, so that the steam dryness at the cold side outlet 12 can be improved. It should be noted that each curved channel 232 includes a plurality of first channels 2321 and second channels 2322 connected in sequence, the inclination angles of the first channels 2321 can be the same or different, and the inclination angles of the second channels 2322 can also be the same or different. Further, for different curved channels 232, the inclination angles of the first channels 2321 can be the same or different, and the inclination angles of the second channels 2322 can also be the same or different.

[0043] Please refer to Figure 4 The cold side heat exchange plate 21 includes the first heat exchange plate 211 and the second heat exchange plate 212 connected with each other, the first heat exchange plate 211 and the second heat exchange plate 212 are arranged away from the middle part of the heat exchange core 2 to both sides of the heat exchange core 2, and the cold side heat exchange plate 21 is in a “person” shape from the sectional view. That is, due to the inclination of the first heat exchange plate 211 or the second heat exchange plate 212, the condensate will move along the slope of the upper end surface of the cold side channel 23 to the side wall of the cold side channel 23, and be guided to the next cold side channel 23 by the water guide structure 25 of the side wall, and the condensate will be guided to the auxiliary flow curved channel 2323 with the lowest slope and discharged from the auxiliary flow curved channel 2323 in turn. Correspondingly, due to the “person” shaped cold side heat exchange plate 21, the condensate will flow to both sides, and in order to improve the discharge effect of the condensate, the condensate collecting pipes 26 are arranged at both sides of the heat exchange core 2, and the condensate collecting pipes 26 are communicated with the corresponding auxiliary flow curved channels 2323. That is, taking the central axis of the heat exchange core 2 as the reference, or taking the connection position of the first heat exchange plate 211 and the second heat exchange plate 212 as the reference, the condensate at both sides is guided to the auxiliary flow curved channels 2323 at both sides. Further, the hot side heat exchange plate 22 has the same shape as the cold side heat exchange plate 21 and is arranged in a “person” shape, and a condensate collecting cavity 14 is naturally formed by the bottom heat exchange plate and the inner wall of the shell 1 due to the arrangement of the “person” shaped heat exchange plate. Preferably, the first heat exchange plate 211 and the second heat exchange plate 212 are integrally formed.

[0044] As mentioned above, in order to ensure that the condensate on both sides can be guided to the auxiliary flow curved channels 2323 on both sides, the cold side heat exchange plate 21 comprises an isolation strip 213 located in the middle of the heat exchange core 2, two curved channels 232 are formed on both sides of the isolation strip 213, and the isolation strip 213 is not provided with a water guide structure 25, that is, the isolation strip 213 divides the curved channels 232 into two groups, the condensate in the curved channels 232 on the left side is sequentially guided out and discharged through the auxiliary flow curved channel 2323 on the left side, and the condensate in the curved channels 232 on the right side is sequentially guided out and discharged through the auxiliary flow curved channel 2323 on the right side.

[0045] Specifically, referring to Figure 2 and Figure 3 , the water guide structure 25 comprises a water guide channel 251 penetrating through the two side walls of the first channel 2321. The water guide channel 251 can directly guide the condensate to the adjacent curved channel 232. In order to improve the discharge efficiency of the condensate, the middle part of the water guide channel 251 has a water guide cavity 252 extending along the extension direction of the first channel 2321. It should be noted that the water guide structure 25 in the second channel 2322 is arranged in the same way as the first channel 2321, and therefore the present application will not be described again. Please refer to Figure 4For example, the leftmost curved channel 232 includes, from top to bottom, a first channel 2321, a second channel 2322, a first channel 2321, and a second channel 2322. For example, the left side wall of the first channel 2321 is provided with a water guide structure 25, and the outlet of the water guide structure 25 is directed to the left auxiliary curved channel 2323, which is used to guide the condensed water to the left auxiliary curved channel 2323. Further, the angle between the water guide channel 251 and the extension direction of the first channel 2321 is an acute angle. For example, the left side wall of the second channel 2322 is provided with a water guide structure 25, and the outlet of the water guide structure 25 is directed to the left auxiliary curved channel 2323. Further, the angle between the water guide channel 251 and the extension direction of the second channel 2322 is an acute angle. Correspondingly, the rightmost curved channel 232 includes, from top to bottom, a first channel 2321, a second channel 2322, a first channel 2321, and a second channel 2322. For example, the right side wall of the first channel 2321 is provided with a water guide structure 25, and the outlet of the water guide structure 25 is directed to the right auxiliary curved channel 2323, and further, the angle between the water guide channel 251 and the extension direction of the first channel 2321 is an acute angle. It should be noted that the angle between the water guide channel 251 and the corresponding channel needs to be referred to the opening end of the water guide channel 251. For the left water guide channel 251, the opening end is located on the right side (the condensed water is gradually guided from the right side to the left side), and for the right water guide channel 251, the opening end is located on the left side (the condensed water is gradually guided from the left side to the right side). Due to the viewing angle, the auxiliary curved channel 2323 and the corresponding condensed water header 26 are not shown on the right side. Figure 4

[0046] In an optional embodiment, the angle between the extension direction of the water guide channel 251 and the extension direction of the corresponding first channel 2321 is 20°-70°, and correspondingly, the angle between the extension direction of the water guide channel 251 and the extension direction of the corresponding second channel 2322 is 20°-70°.

[0047] As mentioned above, the condensed water is transported from the middle to both sides of the heat exchange core 2, and the steam humidity on both sides is greater than that in the middle. In order to improve the dehumidification effect on the steam, in the technical scheme provided by the present application, the length of the straight channel 231 gradually decreases from the middle of the heat exchange core 2 to both sides of the heat exchange core 2, and correspondingly, the length of the curved channel 232 gradually increases from the middle of the heat exchange core 2 to both sides of the heat exchange core 2. In this way, the steam dryness in each cold side channel 23 can be kept relatively average.

[0048] ​Further, the connection mode of the first channel 2321 to the second channel 2322 has multiple modes, in alternative embodiments, the first channel 2321 is linearly connected to the second channel 2322, so that the curved channel 232 is Z-shaped curved; in other alternative embodiments, the first channel 2321 is arcuately connected to the second channel 2322, so that the curved channel 232 is S-shaped curved. It should be noted that the angle of inclination of each first channel 2321 and the second channel 2322 can be the same or different, and the present application does not limit this. Correspondingly, the hot side channel 24 can be linear, Z-shaped, S-shaped or wing-shaped.

[0049] The micro-channel phase change heat exchanger provided by the present application is suitable for a printed circuit board heat exchanger (PCHE), the size of the cold side channel 23 is 0.5-4 mm, and the size of the hot side channel 24 is 0.5-4 mm.

[0050] In order to further improve the steam dryness, the shell 1 is also provided with a cyclone type steam-water separator 3, which has a steam-water inlet 31, a steam outlet 32 and a separated water outlet 33, the steam-water inlet 31 is communicated with each cold side channel 23 through the cold side outlet head 15, the steam outlet 32 is communicated with the cold side outlet 12, and the separated water outlet 33 is communicated with the condensate collecting cavity 14 through the condensate pipeline 34. The cyclone type separator can further realize steam-water separation, and a drain valve 35 is also arranged at the condensate outlet 13, which can ensure that the condensate flows out quickly.

[0051] The micro-channel phase change heat exchanger provided by the present application adopts a "herringbone type" heat exchange plate, naturally forms a condensate collecting cavity 14 at the bottom of the heat exchange core 2, and the cold side channel 23 adopts a straight channel gradually changing into a "Z-shaped" or "S-shaped" wave-shaped plate structure micro-channel. Under the action of gravity and steam entrainment, liquid droplets are collected on the wall surface and gradually collected in the condensate collecting cavity 14 through the water guide structure 25, realizing the purpose of steam dehumidification; the outlet of the cold side channel 23 is also provided with a cyclone type steam-water separator 3, which can realize further dehumidification, and the condensate is collected into the condensate collecting cavity 14 and discharged, and the dehumidified steam is discharged through the steam outlet 32.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A microchannel phase change heat exchanger, comprising: The application relates to a micro-channel phase-change heat exchanger. The shell is provided with a cold-side inlet, a cold-side outlet, a hot-side inlet, a hot-side outlet and a condensate outlet, and is internally provided with a condensate collecting cavity, wherein the condensate outlet is communicated with the condensate collecting cavity; The heat exchange core is arranged in the shell, and comprises cold-side heat exchange plates and hot-side heat exchange plates which are stacked and arranged alternately along the height direction of the shell, wherein the cold-side heat exchange plates are provided with a plurality of cold-side channels, the hot-side heat exchange plates are provided with a plurality of hot-side channels, the cold-side channels comprise straight channels and curved channels which are connected in sequence, the straight channels are communicated with the cold-side inlet, the curved channels are communicated with the cold-side outlet, and one end of the hot-side channels is communicated with the hot-side inlet and the other end is communicated with the hot-side outlet; The curved channels comprise first channels and second channels which are arranged alternately, the first channels and the second channels are arranged obliquely, the curved channels comprise two auxiliary curved channels which are arranged close to the two sides of the heat exchange core respectively, the first channels and the second channels of at least partially continuous adjacent curved channels from at least one of the two auxiliary curved channels are provided with water guide structures, the water guide structures are arranged in the two side walls of the first channels or the second channels, the extension direction of each water guide structure and the extension direction of the corresponding first channel or second channel form an acute angle, and the water guide structures are used for guiding the condensate to the corresponding auxiliary curved channels in sequence; At least one side of the heat exchange core is provided with a condensate collecting pipe, one end of the condensate collecting pipe is communicated with the corresponding auxiliary curved channel, and the other end is communicated with the condensate collecting cavity.

2. The micro-channel phase-change heat exchanger according to claim 1, wherein the shell is further provided with a cyclone type steam-water separator, the cyclone type steam-water separator is provided with a steam-water inlet, a steam outlet and a separated water outlet, the steam-water inlet is communicated with each cold-side channel through a cold-side outlet head, the steam outlet is communicated with the cold-side outlet, and the separated water outlet is communicated with the condensate collecting cavity through a condensate pipeline.

3. The microchannel phase-change heat exchanger of claim 1, wherein, The cold-side heat exchange plates comprise first heat exchange plates and second heat exchange plates which are connected with each other, the first heat exchange plates and the second heat exchange plates are arranged away from the middle part of the heat exchange core to the two sides of the heat exchange core gradually, and the two sides of the heat exchange core are provided with condensate collecting pipes which are communicated with the corresponding auxiliary curved channels; The first heat exchange plates and the second heat exchange plates are arranged in an integrated mode.

4. The microchannel phase-change heat exchanger of claim 3, wherein, The cold-side heat exchange plate located at the lowermost end and the inner wall of the shell form the condensate collecting cavity.

5. The microchannel phase-change heat exchanger of claim 3, wherein, The cold-side heat exchange plates comprise an isolation belt located at the middle part of the heat exchange core, two curved channels are formed on the two sides of the isolation belt respectively, and the water guide structures are not arranged on the isolation belt.

6. The microchannel phase-change heat exchanger of claim 1, wherein, The water guide structure comprises a water guide channel arranged in the two side walls of the first channel, the middle part of the water guide channel is provided with a water guide cavity, and the water guide cavity extends along the extension direction of the first channel.

7. The microchannel phase-change heat exchanger of claim 6, wherein, The extension direction of the water guide channel and the extension direction of the corresponding first channel form an angle of 20-70 degrees.

8. The microchannel phase-change heat exchanger of claim 1, wherein, The length of the straight channel gradually decreases from the middle of the heat exchange core to the two sides of the heat exchange core, and the length of the curved channel gradually increases from the middle of the heat exchange core to the two sides of the heat exchange core.

9. The microchannel phase-change heat exchanger of claim 1 wherein, The first channel and the second channel are linearly connected to make the curved channel Z-shaped, or the first channel and the second channel are arcuately connected to make the curved channel S-shaped.

10. The microchannel phase-change heat exchanger of claim 1 wherein, The hot-side channel is linear, Z-shaped, S-shaped or wing-shaped.

11. The microchannel phase-change heat exchanger of claim 1, wherein The size of the cold-side channel is 0.5-4 mm.

12. The microchannel phase-change heat exchanger of claim 1, wherein, A drain valve is arranged at the condensate water outlet.

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