Heat exchanger and electrochemical energy conversion system

Abstract

The utility model discloses a heat exchanger and electrochemistry energy conversion system, including a plurality of heat exchange core body, heat exchange core body includes first heat exchange core body and second heat exchange core body, the second heat exchange core body is laminated on the first heat exchange core body, the first heat exchange core body is provided with a first cold side flow channel and a first hot side flow channel, and the second heat exchange core body is provided with a second cold side flow channel and a second hot side flow channel. The first heat exchange core body is provided with a first cold side flow channel and a first hot side flow channel, the first cold side flow channel forms a first cold side inlet and a first cold side outlet, the first hot side flow channel forms a first hot side inlet and a first hot side outlet, the second heat exchange core body is provided with a second cold side flow channel and a second hot side flow channel, and the second cold side flow channel forms a second cold side inlet and a second cold side outlet; a second hot side inlet and a second hot side outlet are formed in the second hot side runner, the first cold side outlet is communicated with the second cold side inlet, and the second hot side outlet is communicated with the first hot side inlet. The design difficulty of the heat exchanger is reduced, and the problem that the reliability of the heat exchanger is affected due to heat stress concentration and the like caused by overhigh temperature gradient when large-temperature-difference heating is carried out on the raw material medium is solved.

Description

Technical Field

[0001] The utility model is used in the field of heat exchangers, and in particular relates to a heat exchanger and an electrochemical energy conversion system. Background Art

[0002] Electrochemical energy conversion systems can convert electrical energy into chemical energy and vice versa. For example, fuel cell systems can convert chemical energy stored in fuel into electrical energy, or electrolytic cell systems can convert electrical energy into chemical energy.

[0003] Electrochemical energy conversion systems typically operate at temperatures above 600°C. Therefore, raw materials such as fuel, air, and water must be heated to high temperatures before electrochemical reactions can occur to achieve the conversion between electrical and chemical energy. Furthermore, heat is generated during the operation of electrochemical energy conversion systems. To improve the system's energy efficiency and maintain thermal balance, heat exchangers are typically used to recover excess reaction heat from the system and use it to heat the raw materials to the required reaction temperature.

[0004] The reaction temperature of the raw material medium is high, and the raw material medium needs to be heated from a low temperature (for example, room temperature) to a high temperature (for example, 800°C) within the limited volume space of the heat exchanger. This results in a large temperature difference and a high temperature gradient within the heat exchanger, which can easily lead to problems such as thermal stress concentration inside the heat exchanger, greatly affecting the reliability of the heat exchanger. Utility Model Content

[0005] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art and to provide a heat exchanger and an electrochemical energy conversion system.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] In a first aspect, a heat exchanger comprises a plurality of heat exchange cores, wherein the heat exchange cores comprise a first heat exchange core and a second heat exchange core, wherein the second heat exchange core is stacked on the first heat exchange core, the first heat exchange core is provided with a first cold side flow channel and a first hot side flow channel, the two ends of the first cold side flow channel form a first cold side inlet and a first cold side outlet, the two ends of the first hot side flow channel form a first hot side inlet and a first hot side outlet, the second heat exchange core is provided with a second cold side flow channel and a second hot side flow channel, the two ends of the second cold side flow channel form a second cold side inlet and a second cold side outlet, the two ends of the second hot side flow channel form a second hot side inlet and a second hot side outlet, the first cold side outlet is connected to the second cold side inlet, and the second hot side outlet is connected to the first hot side inlet.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the first hot side inlet is located at the top of the first heat exchange core, the first hot side outlet is located at the bottom of the first heat exchange core, the second hot side inlet is located at the top of the second heat exchange core, the second hot side outlet is located at the bottom of the second heat exchange core, the second heat exchange core is stacked on the first heat exchange core, and the second hot side outlet is connected to the first hot side inlet.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the first cold side inlet and the first cold side outlet are located on the side of the first heat exchange core, the first heat exchange core is provided with a plurality of first cold side flow channels and a plurality of first hot side flow channels, the first cold side flow channels and the first hot side flow channels are alternately arranged, and a first heat exchange baffle is provided between adjacent first cold side flow channels and the first hot side flow channels; the second cold side inlet and the second cold side outlet are located on the side of the second heat exchange core, the second heat exchange core is provided with a plurality of second cold side flow channels and a plurality of second hot side flow channels, the second cold side flow channels and the second hot side flow channels are alternately arranged, and a second heat exchange baffle is provided between adjacent second cold side flow channels and the second hot side flow channels.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the first cold side outlet and the second cold side inlet are located on the same side, and the heat exchanger is provided with a first connecting cavity cover, which simultaneously covers the first cold side outlet and the second cold side inlet, so that the first cold side outlet is connected to the second cold side inlet.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, a third heat exchange core is further included, and the third heat exchange core is stacked on the second heat exchange core. The third heat exchange core is provided with a third cold side flow channel and a third hot side flow channel, and the two ends of the third cold side flow channel form a third cold side inlet and a third cold side outlet, and the two ends of the third hot side flow channel form a third hot side inlet and a third hot side outlet, the second cold side outlet is connected to the third cold side inlet, and the third hot side outlet is connected to the second hot side inlet.

[0012] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the third hot side inlet is located at the top of the third heat exchange core, the third hot side outlet is located at the bottom of the third heat exchange core, the third heat exchange core is stacked on the second heat exchange core, and the third hot side outlet is connected to the second hot side inlet.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the third cold side inlet and the third cold side outlet are located on the side of the third heat exchange core, the third heat exchange core is provided with a plurality of third cold side flow channels and a plurality of third hot side flow channels, the third cold side flow channels and the third hot side flow channels are alternately arranged, and a third heat exchange baffle is provided between adjacent third cold side flow channels and the third hot side flow channels.

[0014] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the second cold side outlet and the third cold side inlet are located on the same side, and the heat exchanger is provided with a second connecting sealing cavity cover, which simultaneously covers the second cold side outlet and the third cold side inlet, so that the second cold side outlet is connected to the third cold side inlet.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the temperature of the cold side inlet of the cold side flow channel of the heat exchange core is T, the temperature of the cold side outlet is T', the temperature at which Cr volatilizes is Tc, and when T'>Tc, an anti-Cr volatilization coating is formed on the surface of the flow channel cavity wall of the cold side flow channel of the heat exchange core.

[0016] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, fins are provided in the first cold-side flow channel and / or the first hot-side flow channel.

[0017] In a second aspect, an electrochemical energy conversion system comprises the heat exchanger described in any implementation of the first aspect.

[0018] One of the above technical solutions has at least one of the following advantages or beneficial effects: the heat exchanger of the utility model adopts a segmented structural design, so that the heat exchanger includes at least two heat exchange cores stacked on each other, and the cold side fluid flows through the first heat exchange core and the second heat exchange core in sequence, and the hot side fluid flows through the second heat exchange core and the first heat exchange core in sequence, so that the cold side fluid and the hot side fluid are heat exchanged in the first heat exchange core and the second heat exchange core respectively.

[0019] Through the above design, the temperature range H1 of the first heat exchange core is lower than the temperature range H2 of the second heat exchange core (for example, H1 is 25°C to 400°C, and H2 is 400°C to 800°C). Compared with the situation where the temperature gradient of the heat exchanger is too high when the heat exchanger is composed of a single heat exchange core, the first heat exchange core and the second heat exchange core of the present invention each have a lower temperature gradient, thereby effectively dispersing the temperature gradient of the entire heat exchanger and ensuring the stability and reliability of the heat exchanger. For example, when it is necessary to heat the fluid medium from room temperature 25°C to 800°C, if the heat exchanger is composed of a single heat exchange core, the maximum temperature gradient of the heat exchanger is 775°C; if a segmented heat exchanger with two heat exchange cores is used, and H1 is 25°C to 400°C and H2 is 400°C to 800°C, the maximum temperature gradient that actually affects the design of the heat exchanger is 400°C, which is much lower than the case of a single heat exchange core.

[0020] Furthermore, the present invention allows for differentiated design of heat exchange core materials and structures according to different temperature ranges, resulting in a high degree of design flexibility. In short, the present invention reduces the design difficulty of the heat exchanger while also avoiding issues such as thermal stress concentration caused by excessively high temperature gradients when heating the raw material medium with large temperature differences, which can affect the reliability of the heat exchanger itself.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a structural stereogram of an embodiment of the heat exchanger of the present utility model;

[0024] Figure 2 This is a front view of the structure of an embodiment of the heat exchanger of the utility model;

[0025] Figure 3 This is a top view of the structure of an embodiment of the heat exchanger of the utility model;

[0026] Figure 4 This is a bottom view of the structure of an embodiment of the heat exchanger of the present utility model;

[0027] Figure 5 yes Figure 2 Cross-section at AA;

[0028] Figure 6 yes Figure 2 Cross-section at the middle BB;

[0029] Figure 7 yes Figure 2 Cross-section at CC;

[0030] Figure 8 yes Figure 2 Cross-section at middle DD;

[0031] Figure 9 This is a side view of an embodiment of the heat exchanger of the present invention;

[0032] Figure 10 This is another side view of an embodiment of the heat exchanger of the present invention;

[0033] Figure 11 This is an exploded view of the structure of an embodiment of the heat exchanger of the present utility model;

[0034] Figure 12 This is an axonometric view of the first heat exchange core of an embodiment of the heat exchanger of the present utility model;

[0035] Figure 13 This is a top view of the first heat exchange core of an embodiment of the heat exchanger of the present utility model;

[0036] Figure 14 yes Figure 13 A partial enlarged view of point E in the middle;

[0037] Figure 15 This is a side view of the first heat exchange core of an embodiment of the heat exchanger of the present utility model;

[0038] Figure 16 yes Figure 15 A partial enlarged view of point F in the middle;

[0039] Figure 17 This is a schematic diagram of the structure of the second heat exchange core of an embodiment of the heat exchanger of the present utility model. DETAILED DESCRIPTION

[0040] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0041] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0043] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0044] in, Figure 1 、 Figure 2 、 Figure 9 and Figure 10 The reference direction coordinate system of the embodiment of the present utility model is given below. Figure 1 、 Figure 2 、 Figure 9 and Figure 10 The embodiment of the present invention is described with reference to the direction shown.

[0045] The embodiment of the present invention provides a heat exchanger that can be used to preheat the raw material medium of the electrochemical energy conversion system. Figures 1-17 The heat exchanger includes a plurality of heat exchange cores, the heat exchange cores including a first heat exchange core 100 and a second heat exchange core 200, the second heat exchange core 200 is stacked on the first heat exchange core 100, the first heat exchange core 100 is provided with a first cold side flow channel 101 and a first hot side flow channel 102, the two ends of the first cold side flow channel 101 form a first cold side inlet 103 and a first cold side outlet 104, the two ends of the first hot side flow channel 102 form a first hot side inlet 105 and a first hot side outlet A hot side outlet 106, the second heat exchange core 200 is provided with a second cold side flow channel 201 and a second hot side flow channel 202, the two ends of the second cold side flow channel 201 form a second cold side inlet 203 and a second cold side outlet 204, the two ends of the second hot side flow channel 202 form a second hot side inlet 205 and a second hot side outlet 206, the first cold side outlet 104 is connected to the second cold side inlet 203, and the second hot side outlet 206 is connected to the first hot side inlet 105.

[0046] The heat exchanger of the present invention adopts a segmented structural design, so that the heat exchanger includes at least two heat exchange cores stacked on each other. The cold side fluid flows through the first heat exchange core 100 and the second heat exchange core 200 in sequence, and the hot side fluid flows through the second heat exchange core 200 and the first heat exchange core 100 in sequence, so that the cold side fluid and the hot side fluid are heat exchanged in the first heat exchange core 100 and the second heat exchange core 200 respectively. The cold side fluid can flow through the first cold side inlet 103-the first cold side channel 101-the first cold side outlet 104-the second cold side inlet 203-the second cold side channel 201-the second cold side outlet 204 in sequence; the hot side fluid can flow through the second hot side inlet 205-the second hot side channel 202-the second hot side outlet 206-the first hot side inlet 105-the first hot side channel 102-the first hot side outlet 106 in sequence; thereby, the cold side fluid and the hot side fluid realize heat exchange in the first heat exchange core 100 and the second heat exchange core 200 respectively.

[0047] Through the above design, the temperature range H1 of the first heat exchange core 100 is lower than the temperature range H2 of the second heat exchange core 200 (for example, H1 is 25°C to 400°C, and H2 is 400°C to 800°C). Compared with the situation where the heat exchanger temperature gradient is too high when the heat exchanger is composed of a single heat exchange core, the first heat exchange core 100 and the second heat exchange core 200 of the utility model each have a lower temperature gradient, thereby effectively dissipating the temperature gradient of the entire heat exchanger and ensuring the stability and reliability of the heat exchanger. For example, when it is necessary to heat the fluid medium from room temperature 25°C to 800°C, if the heat exchanger is composed of a single heat exchange core, the maximum temperature gradient of the heat exchanger is 775°C; if a segmented heat exchanger with two heat exchange cores is used, and H1 is 25°C to 400°C and H2 is 400°C to 800°C, the maximum temperature gradient that actually affects the heat exchanger design is 400°C, which is much lower than the case of a single heat exchange core.

[0048] Furthermore, the present invention allows for differentiated design of heat exchange core materials and structures according to different temperature ranges, resulting in a high degree of design flexibility. In short, the present invention reduces the design difficulty of the heat exchanger while also avoiding issues such as thermal stress concentration caused by excessively high temperature gradients when heating the raw material medium with large temperature differences, which can affect the reliability of the heat exchanger itself.

[0049] In some embodiments, Figure 1 、 Figure 2 、 Figure 9 、 Figure 10 、 Figure 11The first hot side inlet 105 is located at the top of the first heat exchange core 100, the first hot side outlet 106 is located at the bottom of the first heat exchange core 100, the second hot side inlet 205 is located at the top of the second heat exchange core 200, the second hot side outlet 206 is located at the bottom of the second heat exchange core 200, the second heat exchange core 200 is stacked on the first heat exchange core 100, and the second hot side outlet 206 is connected to the first hot side inlet 105. The hot side fluid can flow vertically in sequence through the second hot side inlet 205 - the second hot side flow channel 202 - the second hot side outlet 206 - the first hot side inlet 105 - the first hot side flow channel 102 - the first hot side outlet 106. The temperature of the second cold side outlet 204 is greater than the temperature of the first cold side inlet 103; and the temperature of the second hot side inlet 205 is greater than the temperature of the first hot side outlet 106.

[0050] In some embodiments, see Figure 9 、 Figure 10 The first cold side inlet 103 and the first cold side outlet 104 are located on the side of the first heat exchange core 100. The first heat exchange core 100 is provided with a plurality of first cold side flow channels 101 and a plurality of first hot side flow channels 102. The first cold side flow channels 101 and the first hot side flow channels 102 are alternately arranged. A first heat exchange baffle is provided between adjacent first cold side flow channels 101 and first hot side flow channels 102. The cold side flow channels are adjacent to the hot side flow channels and share a partition. The second cold side inlet 203 and the second cold side outlet 204 are located on the side of the second heat exchange core 200. The second heat exchange core 200 is provided with a plurality of second cold side flow channels 201 and a plurality of second hot side flow channels 202. The second cold side flow channels 201 and the second hot side flow channels 202 are alternately arranged. A second heat exchange baffle is provided between adjacent second cold side flow channels 201 and second hot side flow channels 202. The cold side flow channels are adjacent to the hot side flow channels and share a partition. The cold side / hot side flow channel is composed of multiple partitions arranged at intervals from each other, which effectively improves the fluid circulation efficiency and heat exchange effect.

[0051] The first cold-side inlet 103 and the first cold-side outlet 104 are located on different sides or the same side of the first heat exchange core 100. Similarly, the second cold-side inlet 203 and the second cold-side outlet 204 are located on different sides or the same side of the second heat exchange core 200. Preferably, the first cold-side inlet and the first cold-side outlet are located on opposite sides of the first heat exchange core. When the cold-side inlet and the cold-side outlet of the heat exchange core are located on opposite sides of the heat exchange core, the structure of the cold-side flow channel is simple, and the overall structure of the heat exchanger is compact.

[0052] In some embodiments, see Figures 1-11The first cold side outlet 104 and the second cold side inlet 203 are located on the same side. The heat exchanger is provided with a first connecting sealing cavity cover 301. The first connecting sealing cavity cover 301 simultaneously covers the first cold side outlet 104 and the second cold side inlet 203, so that the first cold side outlet 104 and the second cold side inlet 203 are connected.

[0053] In some embodiments, the surface of the channel cavity wall of the second cold-side flow channel 201 is provided with an anti-Cr volatilization coating. The anti-Cr volatilization coating can be selected from but is not limited to: a metal coating (for example, an alloy composed of one or more metal elements selected from Ni, Co, Mn, Pd, Pt, Cu, La, etc.); a ceramic coating (for example, one or more of TiC, Ti3SiC2, CeO2, ZrO2, etc.). The temperature range of the second heat exchange core 200 is relatively high, which makes harmful elements such as Cr in the heat exchange core easily volatilize, and after mixing with the cold-side fluid, it is transmitted to the electrochemical reaction zone together, causing the components of the electrochemical reaction zone (for example, the stack in the fuel cell system or electrolytic cell system) to be poisoned, affecting the stable operation of the electrochemical energy conversion system. The present invention can effectively solve the above problems by forming an anti-Cr volatilization coating on the surface of the channel cavity wall of the second cold-side flow channel 201.

[0054] In addition, optionally, the channel wall surface of the first cold side channel 101 is provided with a Cr volatilization-proof coating, and since the hot side fluid in the hot side channel will not be transmitted to the electrochemical reaction zone, it is preferred not to form the Cr volatilization-proof coating.

[0055] In some embodiments, see Figure 12-16 Fins 107 are provided in the first cold-side flow channel 101 and / or the first hot-side flow channel 102. The temperature range of the first heat exchange core 100 is relatively low, and its structural design has a high tolerance for complexity. Even with a relatively complex structure, the first heat exchange core 100 can operate stably for a long time. By providing fins 107 in the cold-side flow channel and / or the hot-side flow channel of the first heat exchange core 100, the present invention can effectively increase its heat exchange area per unit volume, achieving good heat exchange performance within a limited space.

[0056] Furthermore, a Cr volatilization-proof coating is formed on the surface of the fins 107 in the first cold-side flow channel 101 .

[0057] The relationship between the heat exchange area S1 of the first heat exchange core 100 and the heat exchange area S2 of the second heat exchange core 200 is: S1>S2. Compared with the second heat exchange core 200, the first heat exchange core 100 has a lower temperature range and a greater tolerance for structural design complexity. Complex structural designs can be used to increase its heat exchange area per unit volume, achieving good heat exchange performance within a limited space.

[0058] In some embodiments, the heat exchange core has a temperature gradient of 150°C to 420°C. The heat exchange core temperature gradient is defined as the difference between the cold-side inlet and cold-side outlet temperatures of the heat exchange core. The smaller the temperature gradient of the heat exchange core, the higher the stability and reliability of the core. A smaller temperature gradient is preferred while ensuring volume, cost, performance, and process feasibility.

[0059] Furthermore, assuming the temperature of the cold-side inlet of the heat exchange core is T, the temperature of the cold-side outlet is T', and the temperature at which Cr volatilizes is Tc, when T'>Tc, the surface of the flow channel cavity wall of the cold-side flow channel of the heat exchange core is formed with a Cr volatilization-proof coating. Furthermore, when T≤Tc<T', the surface of the flow channel cavity wall of the cold-side flow channel of the heat exchange core is formed with a Cr volatilization-proof coating.

[0060] For example, in some embodiments, a Cr volatilization-preventing coating is formed on the wall surface of the second cold-side flow channel 201. The temperature of the second cold-side inlet 203 is T2, and the temperature of the second cold-side outlet 204 is T2'. Assuming the temperature at which Cr volatilizes is Tc, then T2 ≤ Tc < T2'. Tc is generally 500°C. Above 500°C, the amount and rate of Cr volatilization are high, necessitating the formation of a Cr volatilization-preventing coating.

[0061] Preferably, the temperature T1' of the first cold-side outlet 104 of the first heat exchange core 100 is ≤ 500°C.

[0062] When designing a sectional heat exchanger, the temperature ranges of the different heat exchange cores determine whether a Cr volatilization-resistant coating is required on the cold-side channel walls. A sectional heat exchanger designed according to these conditions effectively prevents Cr volatilization from affecting components in the electrochemical reaction zone, ensuring stable operation of the electrochemical energy conversion system.

[0063] In some embodiments, see Figures 1-11 The heat exchange core includes a third heat exchange core 400, which is stacked on the second heat exchange core 200. The third heat exchange core 400 is provided with a third cold side flow channel 401 and a third hot side flow channel 402. The two ends of the third cold side flow channel 401 form a third cold side inlet 403 and a third cold side outlet 404, and the two ends of the third hot side flow channel 402 form a third hot side inlet 405 and a third hot side outlet 406. The second cold side outlet 204 is connected to the third cold side inlet 403, and the third hot side outlet 406 is connected to the second hot side inlet 205, so that the cold side fluid output from the second cold side outlet 204 can flow through the third cold side flow channel 401; the hot side fluid can flow through the third hot side inlet 405-the third hot side flow channel 402-the third hot side outlet 406-the second hot side inlet 205 in sequence; thereby, the cold side fluid and the hot side fluid realize heat exchange in the third heat exchange core 400.

[0064] The three heat exchange cores are stacked one on top of the other. The cold-side fluid flows sequentially through the first heat exchange core 100, the second heat exchange core 200, and the third heat exchange core 400, while the hot-side fluid flows sequentially through the third heat exchange core 400, the second heat exchange core 200, and the first heat exchange core 100. This allows the cold-side fluid and the hot-side fluid to exchange heat in the first heat exchange core 100, the second heat exchange core 200, and the third heat exchange core 400, respectively. Through the above design, the temperature range H1 of the first heat exchange core 100 is lower than the temperature range H2 of the second heat exchange core 200, and the temperature range H2 of the second heat exchange core 200 is lower than the temperature range H3 of the third heat exchange core 400 (for example, H1 is 25°C to 300°C, H2 is 300°C to 500°C, and H3 is 500°C to 800°C). Compared with the case of setting up two heat exchange cores, setting up three heat exchange cores can make the temperature gradient of each heat exchange core smaller, thereby further dispersing the temperature gradient of the entire heat exchanger and better ensuring the stability and reliability of the heat exchanger.

[0065] The relationship between the heat exchange area S1 of the first heat exchange core 100, the heat exchange area S2 of the second heat exchange core 200, and the heat exchange area S3 of the third heat exchange core 400 is: S1>S2, and S1>S3. Compared with the second heat exchange core 200 and the third heat exchange core 400, the first heat exchange core 100 has a lower temperature range and a greater tolerance for structural design complexity. A complex structural design can be used to increase its heat exchange area per unit volume, achieving good heat exchange performance within a limited space.

[0066] Further, see Figures 1-11 The third hot side inlet 405 is located at the top of the third heat exchange core 400 , the third hot side outlet 406 is located at the bottom of the third heat exchange core 400 , the third heat exchange core 400 is stacked on the second heat exchange core 200 , and the third hot side outlet 406 is connected to the second hot side inlet 205 .

[0067] Among them, see Figure 9 、 Figure 10 The third cold side inlet 403 and the third cold side outlet 404 are located on the side of the third heat exchange core 400. The third heat exchange core 400 is provided with a plurality of third cold side flow channels 401 and a plurality of third hot side flow channels 402. The third cold side flow channels 401 and the third hot side flow channels 402 are alternately arranged. A third heat exchange baffle is provided between adjacent third cold side flow channels 401 and third hot side flow channels 402.

[0068] The third cold side inlet 403 and the third cold side outlet 404 are respectively located on different sides or the same side of the third heat exchange core 400. Preferably, the third cold side inlet 403 and the third cold side outlet 404 are respectively located on two opposite sides of the third heat exchange core 400.

[0069] In some embodiments, see Figure 1 、 Figure 2 、 Figure 9 The second cold side outlet 204 and the third cold side inlet 403 are located on the same side, and the heat exchanger is provided with a second connecting sealing cavity cover 302, which simultaneously covers the second cold side outlet 204 and the third cold side inlet 403, so that the second cold side outlet 204 is connected to the third cold side inlet 403.

[0070] Further, see Figure 1 、 Figure 2 、 Figure 10 The heat exchanger is provided with a cold side fluid outlet sealing cover 303 and a cold side fluid inlet sealing cover 304. The cold side fluid outlet sealing cover 303 covers the third cold side outlet 404. The cold side fluid outlet sealing cover 303 is provided with an outlet 305, and the cold side fluid can flow out from the outlet 305. The cold side fluid inlet sealing cover 304 covers the first cold side inlet 103. The cold side fluid inlet sealing cover 304 has an inlet 306, and the cold side fluid can flow in from the inlet 306.

[0071] Furthermore, the cold-side fluid outlet sealing cover 303 simultaneously covers the third cold-side outlet 404 and the first communicating sealing cover 301 .

[0072] Preferably, a Cr volatilization-proof coating is formed on the surface of the flow channel cavity wall of the third cold-side flow channel 401 , and no Cr volatilization-proof coating is formed on the surface of the flow channel cavity wall of the third hot-side flow channel 402 .

[0073] In some embodiments, see Figure 1 、 Figure 3 、 Figure 9 and Figure 11 The heat exchanger is provided with a diverter orifice plate 500 on the top of the third heat exchange core 400. The diverter orifice plate 500 covers the third hot side inlet 405 and is provided with a plurality of diverter holes.

[0074] In some embodiments, adjacent heat exchange cores are stacked and connected via a support frame 600 to facilitate assembly of adjacent heat exchange cores.

[0075] In a second aspect, an electrochemical energy conversion system includes the heat exchanger in any one of the above embodiments.

[0076] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. A heat exchanger, characterized in that: The heat exchange core comprises a plurality of heat exchange cores, wherein the heat exchange core comprises a first heat exchange core and a second heat exchange core, the second heat exchange core is stacked on the first heat exchange core, the first heat exchange core is provided with a first cold side flow channel and a first hot side flow channel, the two ends of the first cold side flow channel form a first cold side inlet and a first cold side outlet, the two ends of the first hot side flow channel form a first hot side inlet and a first hot side outlet, the second heat exchange core is provided with a second cold side flow channel and a second hot side flow channel, the two ends of the second cold side flow channel form a second cold side inlet and a second cold side outlet, the two ends of the second hot side flow channel form a second hot side inlet and a second hot side outlet, the first cold side outlet is connected with the second cold side inlet, and the second hot side outlet is connected with the first hot side inlet.

2. The heat exchanger according to claim 1, characterized in that The first hot side inlet is located at the top of the first heat exchange core, the first hot side outlet is located at the bottom of the first heat exchange core, the second hot side inlet is located at the top of the second heat exchange core, and the second hot side outlet is located at the bottom of the second heat exchange core.

3. The heat exchanger according to claim 2, characterized in that The first cold side inlet and the first cold side outlet are located on the side of the first heat exchange core. The first heat exchange core is provided with a plurality of first cold side flow channels and a plurality of first hot side flow channels. The first cold side flow channels and the first hot side flow channels are alternately arranged. A first heat exchange baffle is provided between adjacent first cold side flow channels and the first hot side flow channels. The second cold side inlet and the second cold side outlet are located on the side of the second heat exchange core. The second heat exchange core is provided with a plurality of second cold side flow channels and a plurality of second hot side flow channels. The second cold side flow channels and the second hot side flow channels are alternately arranged. A second heat exchange partition is provided between adjacent second cold side flow channels and second hot side flow channels.

4. The heat exchanger according to claim 3, characterized in that The first cold side outlet and the second cold side inlet are located on the same side. The heat exchanger is provided with a first connecting sealing cavity cover, which simultaneously covers the first cold side outlet and the second cold side inlet, so that the first cold side outlet and the second cold side inlet are connected.

5. The heat exchanger according to claim 3, characterized in that The heat exchange core includes a third heat exchange core, which is stacked on the second heat exchange core. The third heat exchange core is provided with a third cold side flow channel and a third hot side flow channel. The two ends of the third cold side flow channel form a third cold side inlet and a third cold side outlet, and the two ends of the third hot side flow channel form a third hot side inlet and a third hot side outlet. The second cold side outlet is connected to the third cold side inlet, and the third hot side outlet is connected to the second hot side inlet.

6. The heat exchanger according to claim 5, characterized in that The third hot side inlet is located at the top of the third heat exchange core, the third hot side outlet is located at the bottom of the third heat exchange core, the third heat exchange core is stacked on the second heat exchange core, and the third hot side outlet is connected to the second hot side inlet.

7. The heat exchanger according to claim 6, characterized in that The third cold side inlet and the third cold side outlet are located on the side of the third heat exchange core. The third heat exchange core is provided with a plurality of third cold side flow channels and a plurality of third hot side flow channels. The third cold side flow channels and the third hot side flow channels are alternately arranged. A third heat exchange baffle is provided between adjacent third cold side flow channels and the third hot side flow channels.

8. The heat exchanger according to claim 7, characterized in that The second cold side outlet and the third cold side inlet are located on the same side, and the heat exchanger is provided with a second connecting sealing cavity cover, which simultaneously covers the second cold side outlet and the third cold side inlet, so that the second cold side outlet is connected to the third cold side inlet.

9. The heat exchanger according to claim 1, characterized in that The temperature of the cold side inlet of the cold side flow channel of the heat exchange core is T, the temperature of the cold side outlet is T', and the temperature at which Cr volatilizes is Tc. When T'>Tc, a Cr volatilization-proof coating is formed on the flow channel cavity wall surface of the cold side flow channel of the heat exchange core.

10. The heat exchanger according to claim 1, characterized in that Fins are provided in the first cold-side flow channel and / or the first hot-side flow channel.

11. An electrochemical energy conversion system, characterized in that: The heat exchanger comprises the heat exchanger according to any one of claims 1 to 10.

Images