High-pressure heat exchange device for cryogenic liquefaction process

Abstract

The utility model relates to a high pressure heat exchange device for cryogenic liquefaction processing, including the tank shell that can define heat exchange chamber, the graphite heat conduction pipe of several is inserted with according to the mode of parallel with its axis and array arrangement in the shell cavity of tank shell, and the positioning disc group of the setting station that can locate graphite heat conduction pipe is clamped in both ends of tank shell, the intermediate flow guide pipe cylinder that can form with the shell cavity of tank shell with the cooling liquid separation cavity that the positioning disc group is matched with is detachably connected in both ends of tank shell, the flow guide end cover that can communicate with the pipe cavity of graphite heat conduction pipe is still installed in the one end of intermediate flow guide pipe cylinder away from tank shell, the heat exchange pipe network is still sheathed on the pipe body of graphite heat conduction pipe in tank shell. The utility model can reduce the use cost of heat exchange structure and promote the stability of heat exchange structure under the work of high pressure environment by constructing compound heat exchange structure to promote heat exchange effect and quality.

Description

Technical Field

[0001] This utility model relates to the technical field of air cooling equipment for cryogenic liquefaction processing, and in particular to a high-pressure heat exchange device for cryogenic liquefaction processing. Background Technology

[0002] Currently, vigorously developing large-scale energy storage technologies has become a strategic goal for national energy technology development. Liquefied air energy storage technology (LAES) possesses unique advantages such as high energy density and lack of geographical limitations, and is widely considered a promising large-scale energy storage solution. Air separation equipment uses air as raw material, transforming it into a liquid state through compression and deep freezing, and then gradually separating inert gases such as oxygen, nitrogen, and argon from the liquid air through distillation. Its oxygen production capacity accounts for 45%, 30%, and 25% in the coal chemical, petroleum refining, and metallurgical industries, respectively. The air separation process includes compression, precooling, purification, pressurization, refrigeration, heat exchange, and distillation. The refrigeration temperature is comparable to that of LAES, and the raw material is ambient air. In industry, the traditional method for separating air is cryogenic separation, which involves cooling the air to below -150°C and then using low-temperature distillation to achieve separation.

[0003] Before cryogenic liquefaction of air, it typically needs to be compressed to 0.5–0.6 MPa (medium pressure) or higher using a multi-stage compressor to increase its liquefaction temperature. Graphite tubes, with their high thermal conductivity and low coefficient of thermal expansion, exhibit minimal deformation under drastic temperature changes, making them suitable for the low-temperature environment of liquefaction. This allows them to maintain structural stability and morphology during the cryogenic liquefaction of pressurized air, while also preventing oxidation or chemical reactions under high pressure, thus ensuring the effectiveness and quality of cryogenic liquefaction. Compared to metals, graphite has the advantages of low density and light weight. However, a single graphite structure is brittle and may fracture under high pressure. Therefore, composite structures are needed to enhance the overall structural strength of the heat exchanger, extend its service life, and improve heat exchange quality and stability while reducing operating costs. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure heat exchange device for cryogenic liquefaction processing that can improve the heat exchange effect and quality while reducing the cost of the heat exchange structure and improving the stability of the heat exchange structure under high pressure by constructing a composite heat exchange structure. This solves the problems of existing traditional heat exchange structures that use metal as a heat-conducting separator, which have structural deformation and are prone to oxidation or chemical reactions, resulting in easy damage and gradual reduction of heat exchange efficiency during long-term high-pressure heat exchange. Furthermore, the single graphite heat exchange structure is brittle and its structural stability is not stable enough and it is easy to break, which is not conducive to long-term high-pressure heat exchange.

[0005] The technical solution adopted by this utility model is as follows: a high-pressure heat exchange device for cryogenic liquefaction processing, comprising a tank shell that defines a heat exchange chamber, wherein a plurality of graphite heat-conducting tubes are inserted in the shell cavity in an array arranged parallel to the tank's axis, and positioning disks that can position the graphite heat-conducting tubes are clamped at both ends of the tank shell; a middle guide tube is detachably connected to both ends of the tank shell, which can cooperate with the positioning disks to form a coolant compartment that is separated from the shell cavity of the tank shell; a guide end cap that can communicate with the tube cavity of the graphite heat-conducting tube is installed at the end of the middle guide tube away from the tank shell; and a heat exchange network is wrapped around the tube body of the graphite heat-conducting tube inside the tank shell.

[0006] According to a preferred embodiment, the heat exchange network includes a plurality of curved guide pipes that are attached to the outer wall of the graphite heat conduction pipe and are arranged in a staggered manner in the curved sections of the pipe body, and guide insertion bends connected to the two ends of the curved guide pipes. The plurality of curved guide pipes are arranged circumferentially at intervals around the graphite heat conduction pipe, and the pipe body surfaces of adjacent curved guide pipes are connected in a spaced abutting manner.

[0007] According to a preferred embodiment, one end of the flow guide bend away from the curved flow guide tube is connected to the coolant cavity defined by the intermediate flow guide tube in a manner that penetrates the positioning disc assembly.

[0008] According to a preferred embodiment, the positioning disk assembly includes a first partition and a second partition stacked together, and a first elastic sealing ring and a second elastic sealing ring are respectively fitted onto the tube bodies of the graphite heat-conducting tube and the flow-guiding insertion bend to fill the fitting gap between the insertion and fitting, and are positioned between the first partition and the second partition.

[0009] According to a preferred embodiment, a first insert and a second insert, which communicate with the shell cavity, are inserted into the two sides of the shell at a staggered position. A stepped annular groove for mounting the positioning disc assembly is provided on both end faces of the shell. A first connecting flange ring plate is also provided on the outer side wall of both ends of the shell.

[0010] According to a preferred embodiment, the end of the intermediate guide tube facing the tank shell is provided with a first convex ring limiting body in a manner that can abut against and limit the working position of the positioning plate assembly, and the end of the intermediate guide tube away from the tank shell is also provided with a dividing convex cover; a third insert is also inserted into the side wall of the intermediate guide tube.

[0011] According to a preferred embodiment, a second connecting flange ring plate is provided on the outer wall of the flow guide end cover, which is distributed in the same manner as the first connecting flange ring plate.

[0012] According to a preferred embodiment, an air inlet for high-pressure air input is inserted at the center of the end face of the flow guide cover located at the upper axial end of the tank shell; and an air outlet for high-pressure air output is inserted at the center of the end face of the flow guide cover located at the lower axial end of the tank shell.

[0013] The beneficial effects of this utility model are:

[0014] This application utilizes graphite heat pipes to replace traditional metal heat exchanger tubes, thereby improving the chemical stability, structural robustness, and corrosion resistance of the flow channel structure under temperature difference environments. It also avoids the oxidation or chemical reactions that can reduce the heat exchange efficiency of traditional metal pipes, improving the effectiveness and continuous service life of industrial-scale large-volume air liquefaction cooling over extended periods. This application enhances the overall structural integrity by encasing the graphite heat pipes in a heat exchanger network, effectively constricting and shaping the graphite heat pipes. This improves their structural strength and stability under the expansion force of high-pressure airflow, reducing the risk of damage and rupture caused by the high-pressure expansion force, and enhancing overall structural stability and continuous operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred high-pressure heat exchange device for cryogenic liquefaction processing proposed in this utility model;

[0016] Figure 2 This is a side view of a preferred high-pressure heat exchange device for cryogenic liquefaction processing proposed in this utility model.

[0017] Figure 3 This is a partial plan view of the graphite heat pipe of a preferred high-pressure heat exchange device for cryogenic liquefaction processing proposed in this utility model. Detailed Implementation

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The technical solutions provided by this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the descriptions of these embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. In some examples, because some implementation methods belong to existing or conventional technology, they are not described or are not described in detail.

[0020] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the objects being described and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, under reasonable circumstances (without contradiction), include both direct and indirect connections (linkages).

[0021] The following is a detailed explanation with reference to the accompanying drawings.

[0022] Example 1

[0023] This application provides a high-pressure heat exchange device for cryogenic liquefaction processing, which includes a tank shell 1, a graphite heat conduction tube 2, a positioning plate assembly 3, an intermediate guide tube 4, a guide end cover 5, and a heat exchange pipe network 6.

[0024] According to such Figure 1-3In one specific embodiment, the tank shell 1 defines a heat exchange chamber, allowing high-pressure air passing through it to be effectively and uniformly cooled for subsequent separation in a fractionation column (distillation column). Several graphite heat-conducting tubes 2 are inserted into the shell cavity of the tank shell 1 in an array arranged parallel to its axis. Positioning disk assemblies 3 are fitted at both ends of the tank shell 1 to position the graphite heat-conducting tubes 2. Intermediate guide tubes 4 are detachably connected to both ends of the tank shell 1, forming coolant compartments that cooperate with the positioning disk assemblies 3 and separate from the shell cavity of the tank shell 1. A guide end cap 5, communicating with the cavity of the graphite heat-conducting tubes 2, is installed at the end of the intermediate guide tube 4 furthest from the tank shell 1. A heat exchange network 6 is also fitted over the tube body of the graphite heat-conducting tubes 2 inside the tank shell 1. This application utilizes graphite heat pipes 2 to replace traditional metal heat exchanger tubes, thereby improving the chemical stability, structural robustness, and corrosion resistance of the flow channel structure under temperature difference environments. It also avoids the oxidation or chemical reactions that could reduce the heat exchange efficiency of traditional metal pipes, improving the effectiveness and continuous service life of industrial-scale large-volume air liquefaction cooling over extended periods. This application enhances the overall structural integrity by encasing the graphite heat pipes 2 in a heat exchanger network 6, effectively constricting and shaping the graphite heat pipes 2 internally. This improves their structural strength and stability under the expansion force of high-pressure airflow, reducing the risk of damage and rupture caused by the high-pressure expansion force, and enhancing overall structural stability and continuous operating capability. The heat exchange network 6 provided in this application not only improves the structural stability of the graphite heat pipe 2 in the internal expansion state, but also uses the coolant to transfer the heat conducted by the graphite heat pipe 2 through the flow guidance method. This allows the pipe wall of the graphite heat pipe 2 that is in direct contact with the coolant and the pipe wall that is shielded by the heat exchange network 6 to effectively transfer heat, thereby effectively cooling the high-pressure air in its cavity.

[0025] Preferably, a first insert 11 and a second insert 12, communicating with the shell cavity, are inserted at offset positions on both sides of the tank shell 1. Preferably, stepped annular grooves 13 for mounting the positioning disc assembly 3 are provided on both end faces of the tank shell 1. More preferably, a first connecting flange ring plate 14 is also provided on the outer side walls at both ends of the tank shell 1. Preferably, two concentrically arranged sealing filling gaskets are embedded at both ends of the tank shell 1, respectively filling the assembly gaps between them and the positioning disc assembly 3 and the intermediate guide tube 4. Preferably, the first insert 11 near the axial upper end face of the tank shell 1 is the outlet port for coolant to exit its shell cavity; the second insert 12 near the axial lower end face of the tank shell 1 is the inlet port for coolant to enter its shell cavity. Specifically, the first insertion tube 11 and the third insertion tube 43, which serves as the outlet, are arranged on the same side and connected in parallel to the coolant input end of the external coolant circulation device through a three-way pipe structure; the second insertion tube 12 and the third insertion tube 43, which serves as the inlet, are arranged on the same side and connected in parallel to the coolant output end of the external coolant circulation device through a three-way pipe structure.

[0026] Preferably, the external coolant circulation device can be an industrial ultra-low temperature, high-flow-rate circulating coolant cooling system, model BY-6000. It can circulate and output coolant at a specific low temperature as needed, allowing the low-temperature coolant to effectively exchange heat and cool the high-pressure air. This ensures that the high-pressure air gradually cools down to near its liquefaction temperature, allowing it to be further cooled and partially liquefied under the action of an expander or throttle valve.

[0027] Preferably, the positioning disk assembly 3 includes a first partition 31 and a second partition 32 stacked together. Preferably, a first elastic sealing ring 33 and a second elastic sealing ring 34 are provided between the first partition 31 and the second partition 32 to fill the fitting gap of the insertion device, and can be respectively fitted onto the tube body of the graphite heat conduction tube 2 and the flow guide insertion bend 62. Specifically, the first partition 31 and the second partition 32 are arranged in a stacked manner, and both have several through holes for inserting graphite heat-conducting tubes 2 and flow-guiding insertion elbows 62 in a one-to-one correspondence. The edges of the through holes are provided with annular grooves, allowing them to clamp and limit the first elastic sealing ring 33 and the second elastic sealing ring 34. This causes the middle flow-guiding tube 4 and the tank shell 1 to move closer together, forcing the first partition 31 and the second partition 32 to be further pressurized and pressed against each other. Under the aligning pressure, the first partition 31 and the second partition 32 force the first elastic sealing ring 33 and the second elastic sealing ring 34 to undergo compression deformation, thus allowing the rings to more effectively adhere to the surfaces of the graphite heat-conducting tubes 2 and the flow-guiding insertion elbows 62, ensuring the sealing of the insert separation. Specifically, the compressive strength of the first elastic sealing ring 33 is below the bursting value of the graphite heat-conducting tube 2; it mainly ensures sufficient filling of the assembly gaps through a certain degree of pressure.

[0028] Preferably, the end of the intermediate guide tube 4 facing the tank shell 1 is provided with a first convex ring limiting body 41 in a position that can abut against the limiting positioning disc assembly 3. Preferably, the end of the intermediate guide tube 4 away from the tank shell 1 is also provided with a partition convex cover 42 integrally connected thereto. More preferably, the graphite heat conduction tube 2 also penetrates the partition convex cover 42 and communicates with the cavity formed by the guide end cover 5. Preferably, a sealing ring is also sleeved on the graphite heat conduction tube 2, abutting against the upper and lower surfaces of the penetrating convex cover 42, to ensure the effectiveness of the cavity partition and the sealing of the insertion. Preferably, a third insertion tube 43 is also inserted into the side wall of the intermediate guide tube 4. Preferably, the third insertion tubes 43 provided on the cylinders of the two intermediate guide tubes 4 located at the axial upper and axial lower ends of the tank shell 1 are located on different sides. More preferably, the third insertion tube 43 connected to the intermediate guide tube 4 at the upper axial end of the tank shell 1 serves as the outlet, and the third insertion tube 43 connected to the intermediate guide tube 4 at the lower axial end of the tank shell 1 serves as the inlet. Preferably, a sealing filling gasket ring capable of filling the assembly gap between the intermediate guide tube 4 and the guide end cap 5 is also embedded on the end face of the intermediate guide tube 4 that is not covered by the dividing convex cover 42.

[0029] Preferably, the open end of the guide end cover 5 has a stepped surface that matches the end face of the intermediate guide tube 4. Preferably, a second connecting flange ring plate 51, distributed in the same manner as the first connecting flange ring plate 14, is provided on the outer wall of the guide end cover 5. Preferably, an air inlet 52 for high-pressure air input is inserted into the center of the end face of the guide end cover 5 located at the axial upper end of the tank shell 1. More preferably, an air outlet 53 for high-pressure air output is inserted into the center of the end face of the guide end cover 5 located at the axial lower end of the tank shell 1.

[0030] Preferably, the heat exchange network 6 includes several curved guide pipes 61 that are attached to the outer wall of the graphite heat conduction pipe 2 and staggered in their curved sections, as well as guide insertion bends 62 connected to the two ends of the curved guide pipes 61. More preferably, the multiple curved guide pipes 61 are arranged circumferentially around the graphite heat conduction pipe 2 at intervals, and the pipe surfaces of adjacent curved guide pipes 61 are connected by intermittent contact, thereby forming a pipe network with parallel cavities that are not interconnected. Preferably, the curved guide pipes 61 and guide insertion bends 62 of the heat exchange network 6 are made of pipe materials with high thermal conductivity, such as copper, aluminum, and titanium alloys, to improve structural strength and toughness while ensuring high thermal conductivity, and to reduce the risk of breakage of the graphite heat conduction pipe 2 by limiting and shaping it. Preferably, the pipe walls of adjacent curved guide pipes 61 are connected by a material-adding fusion connection at the contact points. Preferably, the curved guide tube 61 and the guide insertion bend 62 are brazed to achieve seamless connection and structural stability of the pipeline. Preferably, the end of the guide insertion bend 62 away from the curved guide tube 61 is connected to the coolant cavity defined by the intermediate guide tube cylinder 4 through the positioning plate assembly 3. The several curved guide tubes 61 provided in this application can be connected to form a mesh sleeve, which is then fitted onto the outer wall of the graphite heat pipe 2 to help define the shape of the graphite heat pipe 2, improve the strength and stability of the graphite heat pipe 2 in maintaining its tube shape, and reduce the risk of the graphite heat pipe 2 rupturing due to internal pressure expansion. Thus, the double-layer composite heat exchange structure can improve structural strength while ensuring high heat exchange efficiency and extending the service life of continuous heat exchange operation.

[0031] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A high-pressure heat exchange device for cryogenic liquefaction processing, comprising a tank shell (1) capable of defining a heat exchange chamber, characterized in that, Several graphite heat-conducting tubes (2) are inserted into the shell cavity of the can shell (1) in an array arranged parallel to its axis, and positioning disks (3) are installed at both ends of the can shell (1) to position the graphite heat-conducting tubes (2). At both ends of the tank shell (1), there are also detachable intermediate guide tubes (4) that can cooperate with the positioning plate assembly (3) to form a coolant compartment that is separated from the shell cavity of the tank shell (1); A flow guide end cap (5) that can communicate with the cavity of the graphite heat conduction tube (2) is also installed at the end of the intermediate flow guide tube (4) away from the tank shell (1); a heat exchange network (6) is also wrapped around the tube body of the graphite heat conduction tube (2) inside the tank shell (1).

2. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 1, characterized in that, The heat exchange network (6) includes several curved guide pipes (61) that are attached to the outer wall of the graphite heat-conducting pipes (2) and staggered in the curved sections of the pipe body, and guide pipes (62) that are connected to the two ends of the curved guide pipes (61). Multiple curved guide tubes (61) are arranged circumferentially around the graphite heat pipe (2), and the tube surfaces of adjacent curved guide tubes (61) are connected in a spaced-abutting manner.

3. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 2, characterized in that, The end of the flow guide bend (62) away from the bend flow guide (61) is connected to the coolant cavity defined by the intermediate flow guide tube (4) in a manner that passes through the positioning plate assembly (3).

4. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 3, characterized in that, The positioning disk assembly (3) includes a first partition (31) and a second partition (32) stacked together, and a first elastic sealing ring (33) and a second elastic sealing ring (34) are provided between the first partition (31) and the second partition (32) to fill the fitting gap of the insertion device and can be respectively fitted onto the body of the graphite heat conduction tube (2) and the flow guide insertion bend (62).

5. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 4, characterized in that, A first insert (11) and a second insert (12) communicating with the cavity of the can shell (1) are inserted at a staggered position on both sides of the can shell (1). A stepped annular groove (13) for mounting the positioning disc assembly (3) is provided on both end faces of the tank shell (1), and a first connecting flange ring plate (14) is also provided on the outer side walls at both ends of the tank shell (1).

6. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 5, characterized in that, The middle guide tube (4) is provided with a first convex ring limiting body (41) at one end facing the tank shell (1) in a manner that can abut against and limit the position of the positioning disk assembly (3), and a partition convex cover (42) is also provided at the other end of the middle guide tube (4) away from the tank shell (1). A third tube (43) is also inserted into the side wall of the intermediate guide tube (4).

7. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 6, characterized in that, A second connecting flange ring plate (51) is provided on the outer wall of the flow guide end cover (5), which is distributed in the same manner as the first connecting flange ring plate (14).

8. The high-pressure heat exchange device for cryogenic liquefaction processing as described in claim 7, characterized in that, An air inlet (52) for high-pressure air input is inserted at the center of the end face of the guide end cover (5) located at the upper axial end of the tank shell (1); An air outlet (53) for high-pressure air output is inserted at the center of the end face of the flow guide cap (5) located at the lower axial end of the tank shell (1).

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