Heat exchange core with cold side and hot side separated and heat exchanger

Abstract

The utility model belongs to the technical field of fluid heat transfer, and discloses a heat exchange core with a cold side and a hot side separated and a heat exchanger. The cold side unit comprises first heat exchange plates and second heat exchange plates which are alternately stacked, first heat exchange channels are formed in the first heat exchange plates, and second heat exchange channels are formed in the second heat exchange plates; the hot side unit comprises third heat exchange plates and fourth heat exchange plates which are alternately stacked, third heat exchange channels are formed in the third heat exchange plates, and fourth heat exchange channels are formed in the fourth heat exchange plates; the second heat exchange channel and the fourth heat exchange channel are communicated end to end to form a circulating flow channel, and a circulating heat exchange working medium is packaged in the circulating flow channel; under the action of a preset cold and hot temperature difference, the circulating heat exchange working medium can naturally and circularly flow in the circulating flow channel; according to the utility model, the direct contact between the hot fluid working medium and the cold flow working medium is avoided, the risk that the local wall temperature is lower than the freezing point due to improper flow regulation is reduced, and the frosting and freezing phenomena are effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fluid heat transfer technology, especially relates to a heat exchange core body and heat exchanger of cold and hot sides are separated. BACKGROUND

[0002] With the development of new energy technology, in the vaporization process of liquid hydrogen, LNG and the like, hot water of a preset temperature such as seawater is usually used as a heat exchange medium for heating and vaporization; wherein, for the requirement of the heat exchanger, not only excellent low-temperature resistance ( <-162 DEG C) and high-pressure resistance are required, but also the heat exchanger is required to be small in size and light in weight.

[0003] At present, a micro-channel heat exchanger is usually used as a heat exchange device for heating and vaporization of liquid hydrogen, LNG and the like, such as a printed circuit board heat exchanger; although the micro-channel heat exchanger has advantages such as high-efficiency heat transfer and compact structure in the application of LNG vaporizers and liquid hydrogen vaporizers, the following problems generally exist: the local wall temperature of the hot water side is lower than the freezing point of water due to the flow regulation, and then local frosting and icing phenomenon occurs, causing the blockage and failure of the equipment; however, due to the size limitation and difficulty in disassembly of the micro-channel heat exchanger, an electric heating wire is usually arranged to solve the freezing blockage problem, but this method is slow and has high energy consumption. SUMMARY

[0004] In view of the technical problems in the prior art, the utility model provides a heat exchange core body and heat exchanger of cold and hot sides are separated to solve the technical problem that when the micro-channel heat exchanger is used as a heat exchange device for heating and vaporization of liquid hydrogen, LNG and the like, local frosting and icing phenomenon easily occurs, and then the blockage and failure of the equipment are caused.

[0005] To achieve the above purpose, the utility model adopts the technical scheme that:

[0006] The utility model provides a heat exchange core body and heat exchanger of cold and hot sides are separated, including cold side unit and hot side unit;

[0007] The cold side unit includes first heat exchange sheet and second heat exchange sheet that are alternately stacked, the first heat exchange sheet is provided with first heat exchange channel, the second heat exchange sheet is provided with second heat exchange channel;The hot side unit includes third heat exchange sheet and fourth heat exchange sheet that are alternately stacked, the third heat exchange sheet is provided with third heat exchange channel, the fourth heat exchange sheet is provided with fourth heat exchange channel;

[0008] The first heat exchange channel is a flow channel of a cold fluid working medium, and the third heat exchange channel is a flow channel of a hot fluid working medium; the second heat exchange channel and the fourth heat exchange channel are connected in series to form a circulating flow channel, and a circulating heat exchange working medium is encapsulated in the circulating flow channel; under the action of a preset cold-hot temperature difference, the circulating heat exchange working medium can flow naturally in the circulating flow channel.

[0009] Further, the application further comprises a cold fluid inlet pipe box, a cold fluid outlet pipe box, a hot fluid inlet pipe box and a hot fluid outlet pipe box.

[0010] The cold fluid inlet pipe box is located at the inlet end of the first heat exchange channel, and the cold fluid outlet pipe box is located at the outlet end of the first heat exchange channel; the hot fluid inlet pipe box is located at the inlet end of the third heat exchange channel, and the hot fluid outlet pipe box is located at the outlet end of the third heat exchange channel.

[0011] Further, the hot fluid inlet pipe box and the hot fluid outlet pipe box are connected to the hot side unit in a detachable manner.

[0012] Further, the fourth heat exchange channel is provided with a capillary core structure, and a one-way conduction structure is arranged at a preset position of the circulating flow channel.

[0013] Further, the surface of the second heat exchange sheet is uniformly provided with a plurality of first dot array structures; one end of the first dot array structure is connected to the second heat exchange sheet, and the other end of the first dot array structure is welded to the surface of the first heat exchange sheet.

[0014] Further, the surface of the fourth heat exchange sheet is uniformly provided with a plurality of second dot array structures; one end of the second dot array structure is connected to the fourth heat exchange sheet, and the other end of the second dot array structure is welded to the surface of the third heat exchange sheet.

[0015] Further, the application further comprises a first heat insulation pipe segment and a second heat insulation pipe segment.

[0016] One end of the first heat insulation pipe segment is connected to the head end of the second heat exchange channel, and the other end of the first heat insulation pipe segment is connected to the tail end of the fourth heat exchange channel; one end of the second heat insulation pipe segment is connected to the tail end of the second heat exchange channel, and the other end of the second heat insulation pipe segment is connected to the head end of the fourth heat exchange channel.

[0017] Further, the cold fluid working medium is LNG or liquid hydrogen, the hot fluid working medium is seawater, and the circulating heat exchange working medium is ethane under a preset pressure.

[0018] Further, the circulating heat exchange working medium is counter-flow heat exchanged with the cold fluid working medium and the hot fluid working medium.

[0019] The utility model also provides a heat exchanger, including cold and hot side separation's heat exchange core body.

[0020] Compared with the prior art, the utility model has the advantages of:

[0021] The cold and hot side separation heat exchange core body provided by the utility model utilizes the design form of cold and hot side separation, the cold side unit is responsible for the circulation of cold fluid working medium, and the hot side unit is responsible for the circulation of hot fluid working medium, the second heat exchange channel and the fourth heat exchange channel form a circulating flow channel in communication with each other, and the circulating heat exchange medium is encapsulated, the circulating heat exchange medium is naturally circulated in the circulating flow channel, heat exchange between the cold fluid working medium and the hot fluid working medium is realized, and then the hot fluid working medium in the hot side unit indirectly heats the cold fluid working medium in the cold side unit through the circulating heat exchange medium, direct contact between the hot fluid working medium and the cold fluid working medium is avoided, the risk that the local wall temperature is lower than the freezing point due to improper flow regulation is reduced, and the occurrence of frosting and icing is effectively prevented, the utility model optimizes the fluid flow path through the indirect heat exchange mode, reduces fluid mixing and turbulence, improves heat transfer efficiency, can realize accurate regulation and control of the heat exchange temperature and the wall temperature of the cold and hot side fluid, has good low-temperature resistance, the circulating heat exchange medium is naturally circulated under the driving of the cold and hot temperature difference, efficient utilization of energy is realized, compared with the traditional method of solving the freezing problem by arranging electric heating wires, the utility model utilizes the natural circulation heat exchange principle, does not need additional electric energy input for heating and thawing, and therefore energy consumption is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The three-dimensional structure schematic diagram of the cold and hot side separation heat exchange core body provided for the embodiment 1 is shown in the figure.

[0024] Figure 2 The perspective view of the cold and hot side separation heat exchange core body in the embodiment 1 is shown in the figure.

[0025] Figure 3 The plane cross-sectional view of the cold and hot side separation heat exchange core body in the embodiment 1 is shown in the figure.

[0026] Figure 4 The cold and hot side separation heat exchange core body schematic diagram provided for the embodiment 2 is shown in the figure.

[0027] Wherein, 1 first heat exchange sheet, 2 second heat exchange sheet, 3 third heat exchange sheet, 4 fourth heat exchange sheet, 5 cold fluid inlet header, 6 cold fluid outlet header, 7 hot fluid inlet header, 8 hot fluid outlet header; 9 first dot matrix structure, 10 second dot matrix structure; 11 first heat exchange channel, 31 third heat exchange channel; 100 hot side unit, 200 cold side unit, 300 first heat insulation pipe section, 400 second heat insulation pipe section. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] Embodiment 1

[0030] As shown in the accompanying drawings, Figures 1-3 Embodiment 1 of the present application provides a cold-hot side separated heat exchange core, which comprises a cold side unit, a hot side unit, a cold fluid inlet header 5, a cold fluid outlet header 6, a hot fluid inlet header 7 and a hot fluid outlet header 8.

[0031] The cold side unit comprises a first heat exchange sheet 1 and a second heat exchange sheet 2, the first heat exchange sheet 1 and the second heat exchange sheet 2 are alternately stacked and fixed by diffusion welding process; the first heat exchange sheet 1 is provided with a first heat exchange channel 11, the first heat exchange channel 11 serves as a flow channel for cold fluid working medium; wherein the cold fluid working medium is LNG or liquid hydrogen to be vaporized; preferably, the first heat exchange channel 11 is a straight channel, a Z-shaped channel or a wing-shaped channel; the second heat exchange sheet 2 is provided with a second heat exchange channel.

[0032] The hot side unit comprises a third heat exchange sheet 3 and a fourth heat exchange sheet 4, the third heat exchange sheet 3 and the fourth heat exchange sheet 4 are alternately stacked and fixed by diffusion welding process; the third heat exchange sheet 3 is provided with a third heat exchange channel 31, the third heat exchange channel 31 serves as a flow channel for hot fluid working medium; wherein the hot fluid working medium is hot water working medium at a predetermined temperature, such as seawater; preferably, the third heat exchange channel 31 is a straight channel, a Z-shaped channel or a wing-shaped channel; the fourth heat exchange sheet 4 is provided with a fourth heat exchange channel.

[0033] In the second heat exchange plate 2 and the fourth heat exchange plate 4 in the embodiment 1, the inlet and outlet of the heat exchange channels are connected to form an intermediate heat exchange plate layer, and the circulating heat exchange medium is encapsulated in the intermediate heat exchange plate layer to exchange heat with the cold fluid medium in the first heat exchange channel 1 and the hot fluid medium in the third heat exchange channel by the natural circulation of the circulating heat exchange medium, so as to realize the indirect heat exchange between the cold fluid medium and the hot fluid medium, and further to meet the heating and vaporization of the to-be-vaporized LNG or liquid hydrogen.

[0034] Specifically, the second heat exchange channel in the second heat exchange plate 2 and the fourth heat exchange channel in the fourth heat exchange plate 4 are connected in series to form a circulating flow channel, and the circulating heat exchange medium is encapsulated in the circulating flow channel; wherein the outlet of the second heat exchange channel is connected with the inlet of the fourth heat exchange channel, and the inlet of the second heat exchange channel is connected with the outlet of the fourth heat exchange channel; during heat exchange, the circulating heat exchange medium in the second heat exchange channel is used to exchange heat with the cold fluid medium in the first heat exchange channel 11, and the circulating heat exchange medium in the fourth heat exchange channel is used to exchange heat with the hot fluid medium in the third heat exchange channel 31; preferably, the circulating heat exchange medium is ethane with a preset pressure, and the circulating heat exchange medium, the cold fluid medium and the hot fluid medium are all counter-flow heat exchange.

[0035] It should be noted that, in order to realize the connection of the inlet and outlet of the heat exchange channels on the second heat exchange plate 2 and the fourth heat exchange plate 4, a plate structure with a preset flow channel is arranged between the second heat exchange plate 2 and the fourth heat exchange plate 4, or the second heat exchange plate 2 and the fourth heat exchange plate 4 are designed as an integrated intermediate heat exchange plate structure; wherein the integrated intermediate heat exchange plate structure is provided with a circulating heat exchange channel as a flow channel of the circulating heat exchange medium.

[0036] In the embodiment 1, the cold fluid inlet pipe box 5 is located at the inlet end of the first heat exchange channel 11, and the cold fluid inlet pipe box 5 is connected with the inlet end of the first heat exchange plate 1 to uniformly distribute the cold fluid medium into the first heat exchange channel 11 by the cold fluid inlet pipe box 5; the cold fluid outlet pipe box 6 is located at the outlet end of the first heat exchange channel 11, and the cold fluid inlet pipe box 5 is connected with the outlet end of the first heat exchange plate 1 to collect and output the cold fluid medium after heat exchange in the first heat exchange plate 1 by the cold fluid outlet pipe box 6.

[0037] In the embodiment 1, the hot fluid inlet pipe box 7 is located at the inlet end of the third heat exchange channel 31, and the hot fluid inlet pipe box 7 is connected with the inlet end of the third heat exchange sheet 3; wherein the hot fluid inlet pipe box 7 is used for uniformly distributing the hot fluid working medium into the third heat exchange channel 31; the hot fluid outlet pipe box 8 is located at the outlet end of the third heat exchange channel 31, and the hot fluid outlet pipe box 8 is connected with the outlet end of the third heat exchange sheet 3; wherein the hot fluid outlet pipe box 8 is used for collecting and centrally outputting the heat-exchanged hot fluid working medium; the hot fluid inlet pipe box 7 and the hot fluid outlet pipe box 8 are connected with the hot side unit in a detachable manner, so as to facilitate disassembly, flushing and maintenance; specifically, the hot fluid inlet pipe box 7 and the inlet end of the third heat exchange sheet 3 are detachably fixed, and the hot fluid outlet pipe box 8 and the outlet end of the third heat exchange sheet 3 are detachably fixed.

[0038] In the embodiment 1, the surface of the second heat exchange sheet 2 is uniformly provided with a plurality of first dot array structures 9, and the second heat exchange sheet 2 and the first heat exchange sheet 1 are welded and fixed through the plurality of first dot array structures 9, so as to ensure good strength characteristics; wherein one end of the first dot array structure 9 is connected with the second heat exchange sheet 2, and the other end of the first dot array structure 9 is welded with the surface of the first heat exchange sheet 1; preferably, the first dot array structure 9 is obtained by etching the surface of the second heat exchange sheet 2.

[0039] In the embodiment 1, the surface of the fourth heat exchange sheet 4 is uniformly provided with a plurality of second dot array structures 10, and the fourth heat exchange sheet 4 and the third heat exchange sheet 3 are welded and fixed through the plurality of second dot array structures 10, so as to ensure good strength characteristics; wherein one end of the second dot array structure 10 is connected with the fourth heat exchange sheet 4, and the other end of the second dot array structure 10 is welded with the surface of the third heat exchange sheet 3; preferably, the second dot array structure 10 is obtained by etching the surface of the fourth heat exchange sheet 2.

[0040] Working principle:

[0041] The cold-hot side separated heat exchange core body in the embodiment 1 works as follows:

[0042] LNG or liquid hydrogen to be vaporized serves as the cold working fluid, flowing in the first heat exchange channel of the first heat exchange plate. After exchanging heat with the circulating working fluid in the second heat exchange channel, the vaporized working fluid is obtained. Seawater serves as the hot working fluid, flowing through the third heat exchange channel of the third heat exchange plate, exchanging heat with the circulating working fluid in the fourth heat exchange channel. Under the effect of a preset hot and cold temperature difference, the circulating working fluid begins to circulate naturally in the circulation channel. Through the natural circulation of the circulating working fluid, the heat of the hot working fluid is effectively transferred to the cold working fluid, realizing heat exchange between the hot and cold fluids. This avoids direct contact between the cold and hot fluids and reduces problems such as frosting and icing caused by improper flow regulation or excessive temperature difference.

[0043] Specifically, when the hot working fluid flows in the third heat exchange channel, the heat it releases is transferred to the circulating heat exchange working fluid located in the fourth heat exchange channel. After being heated, the circulating heat exchange working fluid in the fourth heat exchange channel flows to the second heat exchange channel of the cold side unit. In the cold side unit, the circulating heat exchange working fluid transfers heat to the cold working fluid flowing through the first heat exchange channel, its own temperature decreases, and it returns to the fourth heat exchange channel of the hot side unit, completing one heat exchange cycle.

[0044] In this embodiment 1, the first heat exchange plate 1 and the second heat exchange plate 2 are alternately stacked to form a cold-side unit, and the third heat exchange plate 3 and the fourth heat exchange plate 4 are alternately stacked to form a hot-side unit. The first heat exchange channel 11 in the first heat exchange plate 1 serves as a flow channel for the cold fluid working medium, i.e., LNG or liquid hydrogen to be vaporized flows through the first heat exchange channel 11. The third heat exchange channel 31 in the third heat exchange plate 3 serves as a flow channel for the hot fluid working medium, i.e., hot water working medium at a preset temperature flows through the third heat exchange channel 31. The second heat exchange plate 2 and the fourth heat exchange plate 4... The components are combined to form an intermediate heat exchange plate. The second heat exchange channel in the second heat exchange plate 2 and the fourth heat exchange channel in the fourth heat exchange plate 4 are connected end to end to form a circulating flow channel, which serves as an intermediate heat exchange layer. By encapsulating the circulating heat exchange medium in the circulating flow channel, the circulating heat exchange medium generates a three-dimensional natural circulation flow under the action of the temperature difference between hot and cold fluids, thereby achieving heat exchange with cold and hot fluids. The diameter of the third heat exchange channel 31 is larger than the channel diameter of the first heat exchange channel 11 to avoid the hot fluid from blocking the third heat exchange channel 31.

[0045] It should be noted that since the freezing point of water is generally 0°C, when it directly exchanges heat with LNG or liquid hydrogen, the local temperature on the water side is easily lower than 0°C, which can easily cause the channel to freeze and become blocked. In this embodiment 1, an intermediate heat exchange layer is set up, and a phase-changeable heat exchange medium is filled into the intermediate heat exchange layer as a circulating heat exchange medium. The design operating temperature of the circulating heat exchange medium is the phase change temperature, and the operating pressure is calculated based on the saturation pressure of the operating temperature. Preferably, the design operating temperature of the circulating heat exchange medium is higher than 0°C and is between the average temperature of the hot fluid and the cold fluid. During manufacturing, a preset mass of working medium is filled into the circulating channel of the intermediate heat exchange plate, and then the filling port is sealed. When the equipment is running, the water side of the circulating heat exchange medium vaporizes after exchanging heat with the hot fluid. The vaporized working medium flows to the cold medium side for heat exchange through circulation, and condenses into a liquid working medium after cooling, thus forming a cycle.

[0046] Example 2

[0047] As attached Figure 4 As shown, this embodiment 2 provides a heat exchange core with separate cold and hot sides, including a cold-side unit 100, a hot-side unit 200, a first insulating tube section 300, and a fourth insulating tube section 400. The cold-side unit 100 and the hot-side unit 200 have basically the same structure as the cold-side unit and the hot-side unit in embodiment 1 above, and will not be described again here.

[0048] One end of the first insulated pipe section 300 is connected to the beginning of the second heat exchange channel in the cold-side unit 100, and the other end of the first insulated pipe section 300 is connected to the end of the fourth heat exchange channel in the hot-side unit 200; one end of the second insulated pipe section 400 is connected to the end of the second heat exchange channel in the cold-side unit 100, and the other end of the second insulated pipe section 400 is connected to the beginning of the fourth heat exchange channel in the hot-side unit 200.

[0049] In this embodiment 2, by setting a first insulating pipe section 300 and a fourth insulating pipe section 400 between the cold side unit 100 and the hot side unit 200, a greater distance is created between the cold side unit 100 and the hot side unit 200 by adding the first insulating pipe section 300 and the fourth insulating pipe section 400, so as to meet the explosion-proof requirements of the cold and hot sides and facilitate equipment layout.

[0050] Example 3

[0051] The heat exchange core with separate hot and cold sides provided in this embodiment 3 is basically the same as the heat exchange core with separate hot and cold sides described in embodiment 1 above, except that:

[0052] A capillary wick structure is provided within the fourth heat exchange channel; wherein, the capillary wick structure is an integrated capillary wick with grooves etched on the inner wall of the fourth heat exchange channel or a pre-set capillary wick structure is provided on the inner wall of the fourth heat exchange channel; wherein, the pre-set capillary wick structure is, for example, a woven wire mesh; preferably, the capillary wick structure is provided on the side closer to the third heat exchange channel; by providing a capillary wick structure within the fourth heat exchange channel, the heat exchange of the circulating heat exchange medium in the liquid phase is enhanced, thereby enhancing the vaporization of the circulating heat exchange medium; based on this, the circulating heat exchange medium circulates within the circulation channel under the combined action of capillary force and gravity.

[0053] In this embodiment 3, a unidirectional flow structure is provided at a preset position of the circulating flow channel; wherein, the unidirectional flow structure is a structure with different forward or reverse flow resistance, so as to guide the circulating heat exchange medium to generate circulating flow in a preset direction; preferably, the unidirectional flow structure is located in the end-to-end connection area between the second heat exchange channel and the fourth heat exchange channel.

[0054] Example 4

[0055] This embodiment 4 provides a heat exchanger, including the heat exchange core described in embodiments 1-3 above; for a detailed description of the heat exchange core, please refer to the description in embodiments 1-3 above. The other structural components of the heat exchanger are similar to the corresponding structures of existing heat exchangers, and will not be described again here.

[0056] The heat exchange core with separate hot and cold sides described in this invention separates the hot and cold sides, with the cold side unit and hot side unit respectively responsible for the flow of cold and hot fluids. A circulating flow channel is formed between the second and fourth heat exchange channels, encapsulating the circulating heat exchange medium. This allows the hot fluid on the hot side to indirectly heat the cold side through the circulating heat exchange medium, avoiding direct contact between the hot fluid and the cold side, thus solving the problems of frost and freezing blockage within the heat exchanger channels. Furthermore, by setting an insulating pipe section between the second and fourth heat exchange plates to connect the two heat exchange channels end-to-end, the length of the insulating pipe section can be adjusted for specific application scenarios, enabling heat exchange over longer distances, which is safer and more efficient. Finally, the modular design of the heat exchange core with separate hot and cold sides allows for relatively easy disassembly and assembly of each heat exchange plate, facilitating maintenance and cleaning, and extending the service life of the equipment.

[0057] This invention utilizes chemical etching and diffusion welding processes for forming, eliminating the need for additional processes. It is economical and efficient, resulting in equipment with high strength and excellent low-temperature resistance. This invention effectively prevents frost and ice formation, improves heat transfer efficiency, and reduces energy consumption. In applications such as LNG vaporizers and liquid hydrogen vaporizers, it enables more stable and reliable operation, reducing downtime and maintenance costs caused by equipment blockage and failure.

[0058] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A heat exchange core with separate hot and cold sides, characterized in that, Includes cold-side units and hot-side units; The cold-side unit includes alternating stacked first heat exchange plates (1) and second heat exchange plates (2), with a first heat exchange channel (11) provided on the first heat exchange plate (1) and a second heat exchange channel provided on the second heat exchange plate (2); the hot-side unit includes alternating stacked third heat exchange plates (3) and fourth heat exchange plates (4), with a third heat exchange channel (31) provided on the third heat exchange plate (3) and a fourth heat exchange channel provided on the fourth heat exchange plate (4); The first heat exchange channel (11) serves as a flow channel for the cold fluid working medium, and the third heat exchange channel (31) serves as a flow channel for the hot fluid working medium; the second heat exchange channel and the fourth heat exchange channel are connected end to end to form a circulation channel, and the circulation channel contains a circulating heat exchange working medium; wherein, under the action of a preset cold and hot temperature difference, the circulating heat exchange working medium can circulate naturally in the circulation channel.

2. The heat exchange core with separate hot and cold sides according to claim 1, characterized in that, It also includes a cold fluid inlet pipe box (5), a cold fluid outlet pipe box (6), a hot fluid inlet pipe box (7), and a hot fluid outlet pipe box (8). The cold fluid inlet pipe box (5) is located at the inlet end of the first heat exchange channel (11), and the cold fluid outlet pipe box (6) is located at the outlet end of the first heat exchange channel (11); the hot fluid inlet pipe box (7) is located at the inlet end of the third heat exchange channel (31), and the hot fluid outlet pipe box (8) is located at the outlet end of the third heat exchange channel (31).

3. A heat exchange core with separate hot and cold sides according to claim 2, characterized in that, The hot fluid inlet pipe box (7) and the hot fluid outlet pipe box (8) are both detachably connected to the hot side unit.

4. A heat exchange core with separate hot and cold sides according to claim 1, characterized in that, The fourth heat exchange channel is provided with a capillary wick structure; a unidirectional conduction structure is provided at the preset position of the circulation channel.

5. A heat exchange core with separate hot and cold sides according to claim 1, characterized in that, The surface of the second heat exchange plate (2) is uniformly provided with a plurality of first lattice structures (9); one end of the first lattice structure (9) is connected to the second heat exchange plate (2), and the other end of the first lattice structure (9) is welded to the surface of the first heat exchange plate (1).

6. A heat exchange core with separate hot and cold sides according to claim 5, characterized in that, The surface of the fourth heat exchange plate (4) is uniformly provided with a plurality of second lattice structures (10); one end of the second lattice structure (10) is connected to the fourth heat exchange plate (4), and the other end of the second lattice structure (10) is welded to the surface of the third heat exchange plate (3).

7. A heat exchange core with separate hot and cold sides according to claim 1, characterized in that, It also includes the first insulation pipe section (300) and the second insulation pipe section (400); One end of the first insulated pipe section (300) is connected to the beginning of the second heat exchange channel, and the other end of the first insulated pipe section (300) is connected to the end of the fourth heat exchange channel; one end of the second insulated pipe section (400) is connected to the end of the second heat exchange channel, and the other end of the second insulated pipe section (400) is connected to the beginning of the fourth heat exchange channel.

8. A heat exchange core with separate hot and cold sides according to claim 1, characterized in that, The cold fluid is LNG or liquid hydrogen, the hot fluid is seawater, and the circulating heat exchange fluid is ethane at a preset pressure.

9. A heat exchange core with separate hot and cold sides according to claim 1, characterized in that, The circulating heat exchange medium is used in countercurrent heat exchange with both the cold and hot fluids.

10. A heat exchanger, characterized in that, Includes a heat exchange core with separate hot and cold sides as described in any one of claims 1-9.

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