Hollow bidirectional countercurrent flow heat exchange piece and heat exchange structure suitable for high-low temperature interface

Abstract

The invention relates to the field of heat exchange, in particular to a hollow bidirectional countercurrent flow heat exchange piece and a heat exchange structure suitable for a high-low temperature interface. When the heat exchanger is used, the heat exchange piece is filled with a heat exchange medium through the flow inlet, and the heat exchange medium flows into the peripheral flow channel and is jetted to the high-temperature or low-temperature critical wall body through the jet holes in the outer wall of the peripheral flow channel. The heat exchange efficiency and the heat exchange effect between the heat exchange medium and the high-temperature critical wall body or the low-temperature critical wall body can be improved, and after heat exchange is conducted between the heat exchange medium and the high-temperature critical wall body or the low-temperature critical wall body, the heat exchange medium flows to the middle flow channel through the flowing channel and reversely flows out; heat exchange can be conducted through the heat exchange wall between the middle flow channel and the peripheral flow channel, so that the temperature of media in the middle flow channel and the peripheral flow channel is balanced to a certain degree, and when the heat exchanger is applied to occasions where high-temperature cooling needs to be conducted or low-temperature heating needs to be conducted, the situation that the temperature of the media in the middle flow channel is too high or too low, and heat exchange pieces are damaged is avoided.

Description

Technical Field

[0001] The invention relates to the field of heat exchange, and in particular to a hollow bidirectional countercurrent heat exchange component and a heat exchange structure suitable for high and low temperature interfaces. Background Art

[0002] In some places such as refractory materials or high-temperature areas of high-temperature reactors such as skimmers and boilers for cooling iron smelting, it is necessary to install cooling devices for cooling. Due to the high temperature in such occasions, the cooling effect of ordinary air cooling is very limited. Most of the existing liquid cooling methods are to set heat exchange tubes inside the high-temperature components, and achieve heat exchange and cooling of the high-temperature components through heat exchange of cooling media. However, in places with higher temperatures, in order to prevent the heat exchange tubes themselves from being deformed or damaged by high temperatures, the material of the heat exchange tubes themselves needs to be able to withstand higher temperatures and have better thermal conductivity, which leads to higher costs for the heat exchange tubes. Similarly, in places where some low-temperature walls need to be heated for protection, in order to prevent the heat exchange tubes themselves from being damaged by low temperatures, the material of the heat exchange tubes themselves needs to be able to withstand lower temperatures and have better thermal conductivity, which also leads to higher costs for the heat exchange tubes. Summary of the invention

[0003] The purpose of the present invention is to provide a hollow bidirectional countercurrent heat exchanger suitable for high and low temperature interfaces, so as to solve the problem of high cost of existing heat exchange tubes that can withstand high or low temperatures. At the same time, the purpose of the present invention is also to provide a hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces.

[0004] The hollow bidirectional countercurrent heat exchanger suitable for high and low temperature interfaces of the present invention includes a heat exchange body, wherein a middle flow channel and a peripheral flow channel are arranged in the heat exchange body, one end of the peripheral flow channel in the medium flow direction is blocked, and the other end forms an inflow port, and the middle flow channel is arranged through in the medium flow direction. When in use, the heat exchange body is arranged inside the high-temperature or low-temperature critical wall body and forms a flow channel connected to the middle flow channel. The outer wall of the peripheral flow channel is provided with a spray hole connected to the flow channel and facing the high-temperature or low-temperature critical wall body, so that the heat exchange medium flowing in forward from the inflow port can be sprayed from the spray hole toward the high-temperature or low-temperature critical wall body, and the heat exchange medium flows out in the opposite direction through the middle flow channel after heat exchange with the high-temperature or low-temperature critical wall body, and the heat exchange body part between the middle flow channel and the peripheral flow channel forms a heat exchange wall.

[0005] Furthermore, the injection hole is a throttling expansion hole.

[0006] Furthermore, the injection hole is arranged to be inclined in the positive direction.

[0007] Furthermore, the heat exchange body is a double-layer circular tube structure including an inner tube and an outer tube, the inner hole of the inner tube is axially connected and constitutes the middle flow channel, one end of the annulus between the inner tube and the outer tube is sealed, the annulus constitutes the peripheral flow channel, and the injection hole is arranged on the outer tube wall.

[0008] Furthermore, the inner wall surface and / or the outer wall surface of the inner tube are provided with threaded grooves or corrugated grooves to enhance heat exchange.

[0009] The present invention provides a pioneering hollow bidirectional countercurrent heat exchanger suitable for high and low temperature interfaces. The heat exchange body of the heat exchanger has a central flow channel and a peripheral flow channel. The peripheral flow channel is blocked at one end in the medium flow direction and forms an inlet at the other end. The central flow channel is arranged through in the medium flow direction. When in use, the heat exchange body is arranged inside the high-temperature or low-temperature critical wall and forms a flow channel connected to the central flow channel. The outer wall of the peripheral flow channel is provided with injection holes connected to the flow channel and facing the high-temperature or low-temperature critical wall. The heat exchange body part between the central flow channel and the peripheral flow channel forms a heat exchange wall.

[0010] When in use, heat exchange medium is filled into the heat exchange element through the inlet, and the heat exchange medium flows into the peripheral flow channel and is sprayed toward the high-temperature or low-temperature critical wall through the spray holes on the outer wall of the peripheral flow channel. This high-speed spraying method can improve the heat exchange efficiency and heat exchange effect between the heat exchange medium and the high-temperature or low-temperature critical wall. After heat exchange between the heat exchange medium and the high-temperature or low-temperature critical wall, it flows to the middle flow channel through the flow channel and flows out in the opposite direction. In the process of the heat exchange medium flowing out in the opposite direction from the middle flow channel, heat exchange can be carried out through the heat exchange wall between the middle flow channel and the peripheral flow channel, thereby balancing the medium temperature in the middle flow channel and the peripheral flow channel to a certain extent. When used in high-temperature cooling applications, it can avoid the medium temperature in the middle flow channel being too high to damage the heat exchange element. When used in low-temperature heating applications, it can avoid the medium temperature in the middle flow channel being too high to damage the heat exchange element. In addition, although the heat exchange medium in the peripheral flow channel exchanges heat with the heat exchange medium in the middle flow channel, reducing the temperature difference with the high-temperature or low-temperature critical wall to a certain extent, the heat exchange effect can be improved by spraying the heat exchange medium toward the high-temperature or low-temperature critical wall in the present invention and exchanging heat with it. The two work together to protect the heat exchange components while ensuring the heat exchange effect.

[0011] The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces of the present invention comprises a high-temperature or low-temperature critical wall and a hollow bidirectional countercurrent heat exchange component, wherein the high-temperature or low-temperature critical wall is provided with an installation inner cavity, and the hollow bidirectional countercurrent heat exchange component comprises a heat exchange body, which is installed in the installation inner cavity, and a middle flow channel and a peripheral flow channel are provided in the heat exchange body, one end of the peripheral flow channel in the medium flow direction is blocked, and the other end forms an inflow port, and the middle flow channel is through-set in the medium flow direction, and the heat exchange body and the installation inner cavity form a flow channel connected with the middle flow channel, and an injection hole connected with the flow channel and facing the cavity wall of the installation inner cavity is provided on the outer wall of the peripheral flow channel, so that the heat exchange medium flowing in from the inflow port in a positive direction can be sprayed from the injection hole toward the high-temperature or low-temperature critical wall, and the heat exchange medium flows out in the reverse direction through the middle flow channel after heat exchange with the high-temperature or low-temperature critical wall, and the heat exchange body part between the middle flow channel and the peripheral flow channel forms a heat exchange wall.

[0012] Furthermore, the injection hole is a throttling expansion hole.

[0013] Furthermore, the injection hole is arranged to be inclined in the positive direction.

[0014] Furthermore, the heat exchange body is a double-layer circular tube structure including an inner tube and an outer tube, the inner hole of the inner tube is axially connected and constitutes the middle flow channel, one end of the annulus between the inner tube and the outer tube is sealed, the annulus constitutes the peripheral flow channel, and the injection hole is arranged on the outer tube wall.

[0015] Furthermore, the inner wall surface and / or the outer wall surface of the inner tube are provided with threaded grooves or corrugated grooves to enhance heat exchange.

[0016] The present invention pioneers a hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces, including a high-temperature or low-temperature critical wall and a hollow bidirectional countercurrent heat exchanger. The heat exchange body of the hollow bidirectional countercurrent heat exchanger is installed in an installation cavity in the high-temperature or low-temperature critical wall. The heat exchange body of the heat exchanger has a central flow channel and a peripheral flow channel. One end of the peripheral flow channel is blocked in the medium flow direction, and the other end forms an inlet. The central flow channel is arranged through in the medium flow direction. The heat exchange body and the high-temperature or low-temperature critical wall form a flow channel connected to the central flow channel. The outer wall of the peripheral flow channel is provided with injection holes connected to the flow channel and facing the high-temperature or low-temperature critical wall. The heat exchange body part between the central flow channel and the peripheral flow channel forms a heat exchange wall.

[0017] When in use, heat exchange medium is filled into the heat exchange element through the inlet, and the heat exchange medium flows into the peripheral flow channel and is sprayed toward the high-temperature or low-temperature critical wall through the spray holes on the outer wall of the peripheral flow channel. This high-speed spraying method can improve the heat exchange efficiency and heat exchange effect between the heat exchange medium and the high-temperature or low-temperature critical wall. After heat exchange between the heat exchange medium and the high-temperature or low-temperature critical wall, it flows to the middle flow channel through the flow channel and flows out in the opposite direction. In the process of the heat exchange medium flowing out in the opposite direction from the middle flow channel, heat exchange can be carried out through the heat exchange wall between the middle flow channel and the peripheral flow channel, thereby balancing the medium temperature in the middle flow channel and the peripheral flow channel to a certain extent. When used in high-temperature cooling applications, it can avoid the medium temperature in the middle flow channel being too high to damage the heat exchange element. When used in low-temperature heating applications, it can avoid the medium temperature in the middle flow channel being too high to damage the heat exchange element. In addition, although the heat exchange medium in the peripheral flow channel exchanges heat with the heat exchange medium in the middle flow channel, reducing the temperature difference with the high-temperature or low-temperature critical wall to a certain extent, the heat exchange effect can be improved by spraying the heat exchange medium toward the high-temperature or low-temperature critical wall in the present invention and exchanging heat with it. The two work together to protect the heat exchange components while ensuring the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces of the present invention.

[0019] In the figure: 10, inner tube; 11, outer tube; 12, annular plugging; 13, middle flow channel; 14, peripheral flow channel; 15, injection hole; 16, flow channel; 2, high and low temperature critical wall; 20, sealing edge. DETAILED DESCRIPTION

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] The present invention uses a hollow bidirectional countercurrent heat exchanger as a heat exchange tube for heat exchange, which includes a middle flow channel and a peripheral flow channel. When installed in a high-temperature or low-temperature critical wall, a flow channel connected to the middle flow channel is formed on the outside of the peripheral flow channel, so that the heat exchange medium in the flow channel exchanges heat with the high-temperature or low-temperature critical wall and separates the hollow bidirectional countercurrent heat exchanger from the high-temperature or low-temperature critical wall, avoiding the high-temperature or low-temperature critical wall directly contacting the heat exchange tube, causing the heat exchange tube to be subjected to extreme temperatures. Moreover, the medium in the flow channel that has exchanged heat with the high-temperature or low-temperature critical wall flows into the middle flow channel, and the heat exchange wall is formed by the heat exchange body part between the middle flow channel and the peripheral flow channel for heat exchange, which can avoid the heat exchange tube from contacting the medium after heat exchange and being subjected to extreme temperatures. The heat exchange tube is protected as a whole, and can be manufactured using low-cost materials while ensuring the heat exchange effect.

[0022] Based on the above invention concept, the present invention provides a variety of hollow bidirectional counterflow heat exchanger embodiments suitable for high and low temperature interfaces for illustration. For the convenience of explanation, the high or low temperature critical wall is referred to as "high and low temperature critical wall" hereinafter.

[0023] In a more basic embodiment, Figure 1 As shown, the hollow bidirectional countercurrent heat exchanger suitable for high and low temperature interface includes a heat exchange body, a middle flow channel 13 and a peripheral flow channel 14 are arranged in the heat exchange body, one end of the peripheral flow channel 14 in the medium flow direction is blocked, and the other end forms an inflow port, and the middle flow channel 13 is arranged through in the medium flow direction, and the heat exchange body is arranged inside the high and low temperature critical wall body 2 when in use, and an installation cavity is arranged in the high and low temperature critical wall body 2, and a sealing edge 20 is arranged at the cavity opening of the installation cavity, and the sealing edge 20 is connected to the outer surface of the heat exchange body at the end where the inflow port is located. The wall seal cooperates, and the outer wall of the installation cavity and the heat exchange body forms a flow channel 16 connected with the middle flow channel 13. The outer wall of the peripheral flow channel 14 is provided with a spray hole 15 connected with the flow channel 16 and facing the high and low temperature critical wall 2, so that the heat exchange medium flowing in from the inlet can be sprayed from the spray hole 15 toward the high and low temperature critical wall 2. After exchanging heat with the high and low temperature critical wall 2, the heat exchange medium flows out in the opposite direction through the middle flow channel 13, and the heat exchange body part between the middle flow channel 13 and the peripheral flow channel 14 forms a heat exchange wall.

[0024] When in use, the heat exchanger is filled with heat exchange medium through the inlet, and the heat exchange medium flows into the peripheral flow channel 14 and is sprayed toward the high and low temperature critical wall 2 through the spray holes 15 on the outer wall of the peripheral flow channel 14. This high-speed spraying method can improve the heat exchange efficiency and heat exchange effect between the heat exchange medium and the high and low temperature critical wall 2. After heat exchange between the heat exchange medium and the high and low temperature critical wall 2, the heat exchange medium flows to the middle flow channel 13 through the flow channel 16 and flows out in the opposite direction. In the process of the heat exchange medium flowing out in the opposite direction from the middle flow channel 13, heat exchange can be carried out through the heat exchange wall between the middle flow channel 13 and the peripheral flow channel 14, thereby balancing the medium temperature in the middle flow channel 13 and the peripheral flow channel 14 to a certain extent. When used in high-temperature cooling applications, the medium temperature in the middle flow channel 13 is prevented from being too high and damaging the heat exchanger. When used in low-temperature heating applications, the medium temperature in the middle flow channel is prevented from being too high and damaging the heat exchanger. In addition, although the heat exchange medium in the peripheral flow channel 14 exchanges heat with the heat exchange medium in the middle flow channel 13, reducing the temperature difference between the high and low temperature critical wall 2 to a certain extent, the heat exchange effect can be improved by spraying the heat exchange medium toward the high and low temperature critical wall 2 and exchanging heat with it in the present invention. The two work together to protect the heat exchange components while ensuring the heat exchange effect.

[0025] On the basis of the above embodiments, in different embodiments, the structure of the heat exchange body may be different. For example, in one embodiment, the heat exchange body may be a double-layer tube structure, including an outer tube 11 and an inner tube 10 arranged coaxially, such as Figure 1 As shown, the right ends of the outer tube 11 and the inner tube 10 are flush, and the annular space between the two is blocked by the annular plug 12. The annular space between the outer tube 11 and the inner tube 10 is the peripheral flow channel 14, and the left end opening of the peripheral flow channel 14 is the inlet. The inner cavity of the inner tube 10 is the middle flow channel 13, which is through the left and right, and the left end of the middle flow channel 13 is the outlet. There is a certain interval between the right end of the installation cavity and the right end of the heat exchange body, and the flow channel 16 formed between the outer peripheral surface of the heat exchange body and the corresponding cavity wall of the installation cavity is connected to the middle flow channel 13 through the interval. A certain number of injection holes 15 facing the cavity wall of the installation cavity are provided on the tube body of the outer tube 11, so that a medium circulation flow path is formed, which flows from the inlet into the peripheral channel, is sprayed from the injection hole 15 toward the cavity wall of the installation cavity, flows from the flow channel 16 to the middle flow channel 13, and flows out from the middle flow channel 13 to the outlet in the opposite direction.

[0026] The installation cavity may be a cavity structure with a circular shape on a cross section perpendicular to the flow direction of the heat exchange medium. After the heat exchange body is installed in the installation cavity, it is coaxially arranged with the installation cavity, that is, the installation cavity and the heat exchange body are arranged one-to-one. Or in other embodiments, the installation cavity is a cavity structure with a long strip shape on a cross section perpendicular to the flow direction of the heat exchange medium. In the same installation cavity, multiple heat exchange bodies are installed in parallel in the length direction of the installation cavity, that is, the installation cavity and the heat exchange body are arranged in a one-to-many manner. Alternatively, in one embodiment, the installation cavity is a cavity structure with a long strip shape on a cross section perpendicular to the flow direction of the heat exchange medium, the heat exchange body is a plate-like structure adapted to the shape of the installation cavity, the middle flow channel 13 is in a long strip shape on a cross section perpendicular to the flow direction of the heat exchange medium, and the peripheral flow channel 14 is in a long strip shape on a cross section perpendicular to the flow direction of the heat exchange medium. The middle flow channel 13 and the peripheral flow channels 14 on both sides thereof are arranged in a stacked manner. In this case, the installation cavity and the heat exchange body are arranged one-to-one.

[0027] On the basis of the above-mentioned embodiments, in one embodiment, the function of the injection hole 15 is to spray the heat exchange medium in the peripheral flow channel 14 toward the cavity wall of the installation cavity in a high-speed spray state, so as to improve the heat exchange effect with the installation cavity. In a preferred embodiment, the injection hole 15 is a throttling expansion hole, that is, the heat exchange medium in the peripheral flow channel 14 is a high-pressure medium, which is depressurized after passing through the throttling expansion hole and is sprayed toward the inner wall of the installation cavity of the high-low temperature critical wall 2 in a mist or gaseous state. The throttling and depressurization are performed through the throttling expansion hole, so that the physical state of the heat exchange medium changes, which is more conducive to improving the heat exchange efficiency between the heat exchange medium and the high-low temperature critical wall 2.

[0028] Based on the above embodiment, in one embodiment, the injection hole 15 is arranged directly opposite to the cavity wall of the installation cavity, that is, the injection is perpendicular to the cavity wall of the installation cavity. In another embodiment, the injection hole 15 is arranged obliquely along the inflow direction of the heat exchange medium, so that the heat exchange medium flows more smoothly and has a smaller flow resistance.

[0029] Based on the above embodiments, in one embodiment, both the outer tube 11 and the inner tube 10 are ordinary round tubes, and both the inner and outer circumferential surfaces thereof are smooth cylindrical surfaces. In another different embodiment, a threaded groove is provided on the inner wall surface and / or the outer wall surface of the inner tube 10, and the threaded groove is provided to guide the spiral flow of the heat exchange medium, thereby increasing the flow path, improving the heat exchange effect with the inner tube 10, and preventing the inner tube 10 from contacting the high-temperature medium in the middle flow channel 13 and causing the temperature to be too high.

[0030] The present invention also provides an embodiment of a hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces. The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces includes a high and low temperature critical wall 2 and a hollow bidirectional countercurrent heat exchange component. The hollow bidirectional countercurrent heat exchange component is the hollow bidirectional countercurrent heat exchange component suitable for high and low temperature interfaces introduced in the above embodiments, that is, the hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces is a structure in which the high and low temperature critical wall 2 and the hollow bidirectional countercurrent heat exchange component are assembled into an integral whole.

[0031] In different embodiments, the hollow bidirectional countercurrent heat exchange structure may have different forms. For example, in one embodiment, the hollow bidirectional countercurrent heat exchange structure is in the shape of a rod, the high and low temperature critical wall body 2 is a tubular structure with one end blocked, the inner cavity of the tubular body is an installation cavity, and the double-layer tubular hollow bidirectional countercurrent heat exchanger is installed in the inner cavity of the tubular high and low temperature critical wall body 2. Or in one embodiment, the hollow bidirectional countercurrent heat exchange structure is a plate-like structure, which is used for the wall of a high-temperature reactor such as a skimmer and a boiler. In this case, the high and low temperature critical wall body 2 is a plate-like structure, and the double-layer tubular hollow bidirectional countercurrent heat exchanger is arranged in rows in the high and low temperature critical wall body 2 of the plate-like structure. Alternatively, as described in the above embodiments, the high and low temperature critical wall 2 is a plate-like structure, and the installation cavity arranged therein is a cavity structure having a long strip shape in the cross section perpendicular to the flow direction of the heat exchange medium, and the heat exchange body is a plate-like structure adapted to the shape of the installation cavity. The middle flow channel 13 has a long strip shape in the cross section perpendicular to the flow direction of the heat exchange medium, and similarly, the peripheral flow channel 14 has a long strip shape in the cross section perpendicular to the flow direction of the heat exchange medium, and the middle flow channel 13 and the peripheral flow channels 14 on both sides thereof are arranged in a stacked form.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. Hollow bidirectional countercurrent heat exchanger suitable for high and low temperature interface, characterized by: The invention comprises a heat exchange body, wherein a middle flow channel and a peripheral flow channel are arranged in the heat exchange body, wherein one end of the peripheral flow channel in the medium flow direction is blocked, and an inflow port is formed at the other end, and the middle flow channel is arranged through in the medium flow direction, and when in use, the heat exchange body is arranged inside a high-temperature or low-temperature critical wall body and forms a flow channel connected with the middle flow channel, and an injection hole connected with the flow channel and facing the high-temperature or low-temperature critical wall body is arranged on the outer wall of the peripheral flow channel, so that the heat exchange medium flowing in positively from the inflow port can be sprayed from the injection hole toward the high-temperature or low-temperature critical wall body, and the heat exchange medium flows out in the reverse direction through the middle flow channel after heat exchange with the high-temperature or low-temperature critical wall body, and the heat exchange body part between the middle flow channel and the peripheral flow channel forms a heat exchange wall.

2. The hollow bidirectional countercurrent heat exchange element suitable for high and low temperature interfaces according to claim 1 is characterized in that: The injection hole is a throttling expansion hole.

3. The hollow bidirectional countercurrent heat exchange element suitable for high and low temperature interfaces according to claim 1 or 2, characterized in that: The injection holes are arranged along a positive inclination.

4. The hollow bidirectional countercurrent heat exchange element suitable for high and low temperature interfaces according to claim 1 or 2, characterized in that: The heat exchange body is a double-layer circular tube structure including an inner tube and an outer tube. The inner hole of the inner tube is axially connected and constitutes the middle flow channel. One end of the annulus between the inner tube and the outer tube is blocked. The annulus constitutes the peripheral flow channel. The injection hole is arranged on the outer tube wall.

5. The hollow bidirectional countercurrent heat exchange element suitable for high and low temperature interfaces according to claim 4 is characterized in that: The inner wall surface and / or the outer wall surface of the inner tube are provided with threaded grooves or corrugated grooves to enhance heat exchange.

6. Hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interface, characterized by: It includes a high-temperature or low-temperature critical wall and a hollow two-way countercurrent heat exchanger. The high-temperature or low-temperature critical wall is provided with an installation inner cavity. The hollow two-way countercurrent heat exchanger includes a heat exchange body, which is installed in the installation inner cavity. A middle flow channel and a peripheral flow channel are provided in the heat exchange body. The peripheral flow channel is blocked at one end in the medium flow direction and forms an inlet at the other end. The middle flow channel is through-set in the medium flow direction. The heat exchange body and the installation inner cavity form a flow channel connected to the middle flow channel. The outer wall of the peripheral flow channel is provided with a spray hole connected to the flow channel and facing the wall of the installation inner cavity, so that the heat exchange medium flowing in from the inlet is sprayed from the spray hole toward the high-temperature or low-temperature critical wall. After heat exchange with the high-temperature or low-temperature critical wall, the heat exchange medium flows out in the opposite direction through the middle flow channel. The heat exchange body part between the middle flow channel and the peripheral flow channel forms a heat exchange wall.

7. The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces according to claim 6 is characterized in that: The injection hole is a throttling expansion hole.

8. The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interface according to claim 6 or 7, characterized in that: The injection holes are arranged along a positive inclination.

9. The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interface according to claim 6 or 7, characterized in that: The heat exchange body is a double-layer circular tube structure including an inner tube and an outer tube. The inner hole of the inner tube is axially connected and constitutes the middle flow channel. One end of the annulus between the inner tube and the outer tube is blocked. The annulus constitutes the peripheral flow channel. The injection hole is arranged on the outer tube wall.

10. The hollow bidirectional countercurrent heat exchange structure suitable for high and low temperature interfaces according to claim 9, characterized in that: The inner wall surface and / or the outer wall surface of the inner tube are provided with threaded grooves or corrugated grooves to enhance heat exchange.

Images