Plate heat exchanger with aluminum fiber felt

Abstract

The utility model relates to a plate heat exchanger with aluminum fiber felts.The plate heat exchanger comprises a heat exchange box, an end socket A, an end socket B, natural gas heat exchange channels, fins, a refrigerant inlet pipe, a refrigerant outlet pipe, a gas inlet pipe and an exhaust pipe, the number of the natural gas heat exchange channels is multiple, the number of the fins is multiple, each fin is arranged between every two adjacent natural gas heat exchange channels, and the number of the fins is multiple. The refrigerant inlet hole communicates with the natural gas heat exchange channel, and the heat exchange gas hole communicates with a refrigerant heat exchange channel composed of the fins and the natural gas heat exchange channel. The aluminum fiber felts are adopted to replace fins and are filled and welded between the heat exchange aluminum plates to form a gas heat exchange channel, and the heat resistance of gas heat transfer is reduced to the level close to zero. And after the refrigerant absorbs the heat of the gas, the liquid-phase refrigerant is evaporated into gas which is discharged from the refrigerant outlet pipe, and low-temperature gas flowing to the bottom of the heat exchanger is discharged from the exhaust pipe. The heat exchanger has incomparable heat exchange performance, the heat exchange efficiency is greatly improved, and then the height, the size and the weight of the heat exchanger are effectively reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of heat exchangers, and in particular, relates to a plate heat exchanger with aluminum fiber felt. Background Art

[0002] Plate-fin heat exchanger is a device that uses metal plates and fins for heat exchange. It has the advantages of compact structure, high heat exchange efficiency and strong applicability. It has become a key equipment in the liquefaction process of gases such as natural gas, helium, hydrogen and air. In the process of natural gas liquefaction, plate-fin heat exchanger is mainly used to cool high-pressure natural gas, and the liquefaction of natural gas is achieved through the circulation of refrigerant in the heat exchange process. In the process of gas heat exchange, due to the relatively low density of the gas, poor heat transfer is prone to occur. When high-pressure natural gas exchanges heat with the fins, in order to reduce the temperature of the high-pressure natural gas to below -162°C for liquefaction, a sufficiently long heat exchange channel and enough heat exchange fins are required to ensure the heat exchange area. Therefore, the existing natural gas liquefaction cold box heat exchanger has the problems of high height, large volume and heavy weight. Utility Model Content

[0003] In order to solve the problems of high height, large volume and heavy weight of a traditional plate-fin heat exchanger, the utility model provides a plate heat exchanger with aluminum fiber felt.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A plate heat exchanger with aluminum fiber felt comprises a heat exchange box, a head A, a head B, a natural gas heat exchange channel, fins, a refrigerant inlet pipe, a refrigerant outlet pipe, an air inlet pipe and an exhaust pipe. Two head A are provided, which are respectively located at the two ends of the heat exchange box. A refrigerant inlet hole is provided on the heat exchange box body at a position corresponding to the position of the head A. The two head A are respectively connected to the refrigerant inlet pipe and the refrigerant outlet pipe; two head B are provided, which are respectively located on the front and rear sides of the heat exchange box. Heat exchange air holes are provided on the heat exchange box body at a position corresponding to the position of the head B. The two head B are respectively connected to the air inlet pipe and the exhaust pipe; a plurality of natural gas heat exchange channels are provided, a plurality of fins are provided, each fin is arranged between two adjacent natural gas heat exchange channels, the refrigerant inlet hole is connected to the natural gas heat exchange channel, and the heat exchange air holes are connected to the refrigerant heat exchange channel composed of the fin and the natural gas heat exchange channel.

[0006] Furthermore, the natural gas heat exchange channel includes two aluminum plates and aluminum fiber felt filled between the two aluminum plates. The upper and lower surfaces of the aluminum fiber felt are welded to the surfaces of the aluminum plates to form a whole. The aluminum fiber felt has good thermal conductivity.

[0007] Furthermore, the heads A are staggered to extend the distance of the gas route and improve the heat exchange efficiency; the heads B are staggered to extend the distance of the gas route and improve the heat exchange efficiency.

[0008] Furthermore, the heat exchange box is composed of two front and rear sealing plates A, two left and right sealing plates B and two upper and lower sealing plates C, which are pre-installed together using tooling and then welded into one in a high-temperature vacuum brazing furnace.

[0009] The beneficial effects of the utility model are:

[0010] Aluminum fiber felt is used instead of fins and filled and welded between the heat exchange aluminum plates. The aluminum fiber greatly promotes the heat exchange between gas molecules and aluminum fiber, and can reduce the thermal resistance of gas heat transfer to a level close to zero. It has unparalleled heat exchange performance and greatly improves the heat exchange efficiency, thereby effectively reducing the height, volume and weight of the heat exchanger, solving the problems of high height, large volume and heavy weight of traditional plate-fin heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present application;

[0013] Figure 2 It is a schematic diagram of the internal left-view structure of an embodiment of the present application;

[0014] Figure 3 is a schematic diagram of a top view of the structure of an embodiment of the present application;

[0015] The reference numerals in the figure are:

[0016] 01. Aluminum fiber felt; 02. Aluminum plate; 03. Fin; 04. Sealing plate A; 05. Sealing plate B; 06. Sealing plate C; 07. Head A; 08. Head B; 09. Refrigerant inlet pipe; 10. Refrigerant outlet pipe; 11. Air inlet pipe; 12. Exhaust pipe; 13. Heat exchange box; 15. Heat exchange air holes; 16. Natural gas heat exchange channel; 17. Refrigerant heat exchange channel. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0020] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0021] Example

[0022] The present embodiment provides a plate heat exchanger with aluminum fiber felt, including a heat exchange box 13, a head A07, a head B08, a natural gas heat exchange channel 16, a fin 03, a refrigerant inlet pipe 09, a refrigerant outlet pipe 10, an air inlet pipe 11 and an exhaust pipe 12. Two heads A07 are provided, which are respectively located at both ends of the heat exchange box 13. A refrigerant inlet hole is provided on the heat exchange box 13 at a position corresponding to the position of the head A07. The two heads A07 are respectively used to connect the refrigerant inlet pipe 09 and the refrigerant outlet pipe 10; two heads B05 are provided, which are respectively located at the front and rear sides of the heat exchange box 13. A heat exchange hole 15 is provided on the box body 13 at a position corresponding to the position of the head B08, and the two heads B are respectively connected to the intake pipe 09 and the exhaust pipe 10; a plurality of natural gas heat exchange channels 16 are provided, and a plurality of fins are provided, each fin is arranged between two adjacent natural gas heat exchange channels 16, and the refrigerant inlet hole is connected to the natural gas heat exchange channel 16, and the fin 03 is filled between the aluminum plates 02 to form a refrigerant heat exchange channel 17, the structure of the fin 03 is wavy, and the material is aluminum, and the heat exchange hole 15 is connected to the refrigerant heat exchange channel 17 composed of the fin 03 and the natural gas heat exchange channel 16;

[0023] The aluminum fiber felt 01 is filled between the aluminum plates 02 to form a natural gas heat exchange channel 16. The upper and lower surfaces of the aluminum fiber felt 01 are welded to the surface of the aluminum plate 02 to form a whole, and it has good thermal conductivity.

[0024] Aluminum fiber felt 01 is a fluffy felt made by sintering pure aluminum fiber filaments. It has certain ductility and can effectively offset the amount of cold and hot deformation. The fluffy state of aluminum fiber felt 01 directly determines its void ratio, which is the ratio of the effective space inside aluminum fiber felt 01 to its total volume. The void ratio is controlled by controlling the diameter and fluffiness of the fiber filaments. The void ratio of aluminum fiber felt 01 directly determines the resistance loss of the gas.

[0025] The sealing plate A04 is welded to the front and rear end surfaces of the aluminum plate 02 to form a whole; the sealing plate B05 is welded to the left and right end surfaces of the aluminum plate 02 to form a whole.

[0026] The sealing plate C06 is arranged on the upper and lower end surfaces and is welded to the uppermost aluminum plate 02 and the uppermost aluminum plate 02 to form a whole.

[0027] The end cap A07 is welded to the sealing plate A04 to form a whole, and the end cap B08 is welded to the sealing plate B05 to form a whole.

[0028] In a feasible implementation scheme of the present utility model, aluminum fiber felt 01, aluminum plate 02, fin 03, sealing plate A04, sealing plate B05, sealing plate C06, head A07 and head B08 are pre-arranged with aluminum-silicon series alloy solder and pre-installed together using special tooling, and then welded into one in a high-temperature vacuum brazing furnace.

[0029] When the utility model is implemented:

[0030] The normal temperature natural gas after pressurization and purification enters the aluminum fiber felt 01 of the gas heat exchange channel from the intake pipe 11, flows downward in the vertical direction, and transfers heat to the surface of the aluminum plate 02 through the aluminum fibers of the aluminum fiber felt 01. The low-temperature liquid refrigerant enters the fin 03 of the refrigerant heat exchange channel 17 from the refrigerant inlet pipe 09, flows upward in the vertical direction, and absorbs heat from the surface of the aluminum plate 02. After the refrigerant absorbs the heat of the natural gas, the liquid phase refrigerant evaporates and becomes a gas phase refrigerant, which is discharged from the refrigerant outlet pipe 10. The -150°C low-temperature natural gas flowing to the bottom of the heat exchanger is discharged from the exhaust pipe 12, and becomes -162°C liquefied natural gas (LNG) after being reduced in pressure by the throttle valve.

[0031] Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A plate heat exchanger with aluminum fiber felt, characterized in that: It includes a heat exchange box, a head A, a head B, a natural gas heat exchange channel, fins, a refrigerant inlet pipe, a refrigerant outlet pipe, an air intake pipe and an exhaust pipe. There are two head A, which are respectively located at the two ends of the heat exchange box. A refrigerant inlet hole is opened on the heat exchange box body at a position corresponding to the position of the head A. The two head A are respectively connected to the refrigerant inlet pipe and the refrigerant outlet pipe; there are two head B, which are respectively located on the front and back sides of the heat exchange box. Heat exchange air holes are opened on the heat exchange box body at a position corresponding to the position of the head B. The two head B are respectively connected to the air intake pipe and the exhaust pipe; there are a number of natural gas heat exchange channels, and there are a number of fins. Each fin is arranged between two adjacent natural gas heat exchange channels. The refrigerant inlet hole is connected to the natural gas heat exchange channel, and the heat exchange air holes are connected to the refrigerant heat exchange channel composed of the fins and the natural gas heat exchange channel.

2. A plate heat exchanger with aluminum fiber felt according to claim 1, characterized in that: The natural gas heat exchange channel comprises two aluminum plates and an aluminum fiber felt filled between the two aluminum plates, and the upper and lower surfaces of the aluminum fiber felt are welded to the surfaces of the aluminum plates to form a whole.

3. A plate heat exchanger with aluminum fiber felt according to claim 2, characterized in that: The sealing heads A are arranged staggered with each other.

4. A plate heat exchanger with aluminum fiber felt according to claim 2, characterized in that: The sealing heads B are arranged staggered with each other.

5. A plate heat exchanger with aluminum fiber felt according to any one of claims 1 to 4, characterized in that: The heat exchange box is composed of two front and rear sealing plates A, two left and right sealing plates B and two upper and lower sealing plates C, which are pre-assembled together using tooling and then welded into one in a high-temperature vacuum brazing furnace.

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