Efficient all-welded plate heat exchanger and using method thereof

Abstract

The invention provides an efficient all-welded plate heat exchanger and a using method thereof. The efficient all-welded plate heat exchanger comprises an upper sealing plate and a lower sealing plate, and the upper sealing plate and the lower sealing plate are fixedly connected through a mounting frame and a partition plate; a plurality of heat exchange plates are fixedly installed between the partition plates, symmetrical corrugated channels are arranged on the outer surface of each heat exchange plate, and the adjacent heat exchange plates form a heat exchange channel through the corrugated channels. According to the technical scheme, compared with a traditional flat plate type heat exchanger, the flat plate type heat exchanger is larger in surface area and higher in heat transfer efficiency, meanwhile, due to the wavy structure, the flat plate type heat exchanger can contain more fluid channels, and therefore the mixing efficiency of liquid and liquid is improved; by improving the structure of the plate heat exchanger, especially on the design of the geometrical shapes of the heat exchange plates and the corrugated channels, the heat transfer efficiency is remarkably improved, the flow resistance is reduced, and the energy consumption of a system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of plate heat exchangers, and in particular to a high-efficiency fully welded plate heat exchanger and a use method thereof. Background Art

[0002] As the global climate change problem becomes increasingly serious, the issue of carbon dioxide (CO2) emissions has become a global focus. As a major carbon dioxide capture technology, chemical absorption plays an important role in the industrial carbon dioxide capture process. Chemical absorption is a technology that uses MEA solution to absorb carbon dioxide, which is widely used in thermal power generation, steel manufacturing and other industries.

[0003] Traditional heat exchangers play a key role in heat transfer in chemical absorption systems. However, these processes have high energy consumption, especially in the heat exchange process. However, existing heat exchangers still have problems such as low heat exchange efficiency, uneven fluid flow, and limited heat transfer area. Therefore, how to improve heat exchange efficiency, reduce flow resistance, and optimize the design of heat exchange plates is an important direction of current heat exchanger research. Summary of the invention

[0004] The purpose of the present invention is to provide a high-efficiency fully welded plate heat exchanger and a method of using the same, which are applied to a chemical absorption carbon capture system to improve the heat exchange efficiency of a carbon dioxide absorption liquid. By optimizing the structure and geometry of the heat exchange plates, the heat exchange efficiency is improved while reducing flow resistance, thereby improving the operating performance of the overall system.

[0005] According to one object of the present invention, the present invention provides a high-efficiency fully welded plate heat exchanger, comprising an upper sealing plate and a lower sealing plate, wherein the upper sealing plate and the lower sealing plate are fixedly connected via a mounting frame and a partition; a plurality of heat exchange plates are fixedly mounted between the partitions, and the outer surface of each of the heat exchange plates is provided with a symmetrical corrugated channel, and adjacent heat exchange plates form a heat exchange channel through the corrugated channel.

[0006] Furthermore, the partitions are installed equidistantly between the upper sealing plate and the lower sealing plate.

[0007] Furthermore, side panels are fixedly mounted on four side surfaces of the upper sealing plate and the lower sealing plate.

[0008] Furthermore, liquid inlet pipes are fixedly installed on the outer surfaces of two adjacent side plates, and liquid outlet pipes are fixedly installed on the outer surfaces of two adjacent side plates.

[0009] Furthermore, the corrugation inclination angle of the corrugated channel is 45°, and the corrugation depth is 2 mm.

[0010] Furthermore, the hydraulic diameter of the corrugated channel is 4 mm.

[0011] Furthermore, the heat exchange plate is made of SUS304 stainless steel with a thickness of 1 mm.

[0012] Furthermore, the heat exchange area of ​​a single heat exchange plate is 0.00833 m2, and the total heat exchange area is 0.816 m2.

[0013] Furthermore, the cross-sectional area of ​​a single corrugated channel is 1.7×10 -4 ㎡, the cross-sectional area of ​​a single flow is 1.197×10 -3 ㎡.

[0014] According to another object of the present invention, the present invention provides a method for using the above-mentioned high-efficiency fully welded plate heat exchanger, comprising the following steps:

[0015] The heat exchanger is fed with the liquid to be exchanged, and then the heat exchange fluid medium is fed into the corrugated channels between the heat exchange plates. The inlet and outlet of the corrugated channels are connected so that the internal heat exchange fluid medium circulates from the inlet and outlet, and the heat exchange plates are in full contact with the liquid to be exchanged, so that the heat exchange fluid medium takes away the excess temperature inside the liquid, and the liquid after heat exchange is discharged, thereby improving the heat exchange efficiency between liquids.

[0016] The technical solution of the present invention has a larger surface area and higher heat transfer efficiency than the traditional flat plate heat exchanger. At the same time, due to the wavy structure, it can accommodate more fluid channels, thereby improving the mixing efficiency of liquids and liquids. The present invention significantly improves the heat transfer efficiency, reduces the flow resistance, and reduces the energy consumption of the system by improving the structure of the plate heat exchanger, especially in the geometric shape of the heat exchange plate and the design of the corrugated channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the internal structure of an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a mounting frame according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a heat exchange plate according to an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the flow direction of the heat exchange fluid medium in the corrugated channel according to an embodiment of the present invention.

[0023] In the figure: 1. upper sealing plate; 2. lower sealing plate; 3. side plate; 4. liquid inlet pipe; 5. liquid outlet pipe; 6. corrugated channel; 7. mounting frame; 8. partition; 9. heat exchange plate. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, 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 connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figure 1-Figure 5 As shown,

[0029] A high-efficiency fully welded plate heat exchanger comprises an upper sealing plate 1 and a lower sealing plate 2, wherein the upper sealing plate 1 and the lower sealing plate 2 are aligned vertically, side plates 3 are fixedly mounted on the four sides of the upper sealing plate 1 and the lower sealing plate 2, liquid inlet pipes 4 are fixedly mounted on the outer surfaces of two adjacent side plates 3, and liquid outlet pipes 5 are fixedly mounted on the outer surfaces of two adjacent side plates 3.

[0030] like Figure 2 As shown, the upper sealing plate 1 and the lower sealing plate 2 are fixed by the mounting frame 7 and the partition plate 8 structure. Specifically, the mounting frame 7 is fixedly installed between the upper sealing plate 1 and the lower sealing plate 2, and multiple partition plates 8 are evenly and evenly fixedly installed between the inner walls of the mounting frame 7. The multiple partition plates 8 are evenly installed between the upper sealing plate 1 and the lower sealing plate 2, and multiple heat exchange plates 9 are evenly and evenly fixedly installed between two adjacent partition plates 8.

[0031] like Figure 3 and Figure 4 As shown, two corrugated channels 6 are symmetrically opened on the outer surface of each heat exchange plate 9, and the heat exchange plates 9 are interlocked with each other in pairs, so that the two corrugated channels 6 on the outer surface form a pipeline structure, thereby improving the efficiency of heat transfer.

[0032] In this embodiment, the size of the heat exchange plate 9 is 100 mm×100 mm, the thickness of the heat exchange plate 9 is 1 mm, and the heat exchange plate 9 is made of SUS304 stainless steel material. SUS304 stainless steel material has excellent corrosion resistance and is resistant to many chemicals, acids, alkalis and salts. At the same time, SUS304 can maintain its structural integrity and resist oxidation at high temperatures, and is suitable for chemical absorption carbon capture systems.

[0033] like Figure 4 As shown, in this embodiment, the corrugation angle of the corrugated channel 6 is 45°, the corrugation depth of the corrugated channel 6 is 2 mm, and the hydraulic diameter of the corrugated channel 6 is 4 mm. The single flow channel cross-sectional area of ​​a single corrugated channel 6 is 1.7×10 -4 ㎡, the single flow cross-sectional area of ​​the corrugated channel 6 is 1.197×10 -3 ㎡.

[0034] In this embodiment, the number of heat exchange plates 9 is 100, the heat exchange area of ​​a single heat exchange plate 9 is 0.00833 m2, and the total heat exchange area of ​​the heat exchange plates 9 is 0.816 m2.

[0035] When the present invention is in use, the liquid to be heat exchanged is introduced into the heat exchanger through the liquid inlet pipe 4, and then the heat exchange fluid medium is introduced into the corrugated channel 6 between the heat exchange plates 9. The inlet and outlet of the corrugated channel 6 are connected, so that the internal heat exchange fluid medium circulates from the inlet and outlet, and the heat exchange plate 9 is fully in contact with the liquid to be heat exchanged, so that the heat exchange fluid medium takes away the excess temperature inside the liquid, and the liquid after heat exchange is discharged from the liquid outlet pipe 5. The device improves the heat exchange efficiency between liquids.

[0036] In this embodiment, the heat exchange plate 9 is made of SUS304 stainless steel, which has excellent performance in the chemical absorption carbon capture system and can maintain long-term stable operation in high temperature and corrosive environments. The structural design of the corrugated channel improves the heat transfer efficiency by optimizing the flow mode of the fluid. In addition, the detachable structure of the heat exchanger facilitates cleaning and maintenance, reducing the downtime of the equipment.

[0037] The heat exchanger of the present invention delivers the liquid to be heat exchanged into the heat exchanger through the liquid inlet pipe, and takes away the heat in the liquid through the heat exchange fluid in the corrugated channel, thereby improving the heat exchange efficiency of the liquid.

[0038] The present invention significantly improves the heat transfer efficiency, reduces the flow resistance, and reduces the energy consumption of the system by improving the structure of the plate heat exchanger, especially in the geometric shape of the heat exchange plate and the design of the corrugated channel. In addition, the present invention also enhances the corrosion resistance and high temperature stability of the equipment, and is very suitable for harsh industrial environments.

[0039] Compared with the traditional flat plate heat exchanger, the present invention has a larger surface area and higher heat transfer efficiency. At the same time, due to the wavy structure, it can accommodate more fluid channels, thereby improving the mixing efficiency of liquid and liquid, and the shape on the plate can enhance the rigidity and pressure bearing capacity of the plate to a certain extent.

[0040] The plate heat exchanger of the present invention also has detachable and washable side plates for routine maintenance and cleaning. This design can reduce the downtime of the heat exchanger and make it more durable because the user can replace damaged parts when necessary.

[0041] The heat transfer coefficient of the fully welded plate type lean-rich liquid heat exchanger of the present invention is much higher than that of the traditional shell and tube heat exchanger. For a 30wt% MEA absorption liquid carbon capture system, when the absorption liquid flow rate in the corrugated channel is 0.1 to 0.7m / s, the heat transfer coefficient of the fully welded plate heat exchanger is 858-2891W / m2·K.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency fully welded plate heat exchanger, characterized in that: It comprises an upper sealing plate and a lower sealing plate, which are fixedly connected via a mounting frame and a partition; a plurality of heat exchange plates are fixedly mounted between the partitions, and a symmetrical corrugated channel is provided on the outer surface of each heat exchange plate, and adjacent heat exchange plates form a heat exchange channel via the corrugated channel.

2. The high-efficiency fully welded plate heat exchanger according to claim 1 is characterized in that: The partitions are installed equidistantly between the upper sealing plate and the lower sealing plate.

3. The high-efficiency fully welded plate heat exchanger according to claim 1 is characterized in that: Side plates are fixedly mounted on the four sides of the upper sealing plate and the lower sealing plate.

4. The high-efficiency fully welded plate heat exchanger according to claim 3 is characterized in that: The outer surfaces of two adjacent side plates are both fixedly mounted with liquid inlet pipes, and the outer surfaces of two adjacent side plates are both fixedly mounted with liquid outlet pipes.

5. The high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The corrugation inclination angle of the corrugated channel is 45°, and the corrugation depth is 2 mm.

6. The high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The hydraulic diameter of the corrugated channel is 4 mm.

7. The high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The heat exchange plate is made of SUS304 stainless steel with a thickness of 1 mm.

8. The high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The heat exchange area of ​​a single heat exchange plate is 0.00833 m2, and the total heat exchange area is 0.816 m2.

9. The high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The cross-sectional area of ​​a single corrugated channel is 1.7×10 -4 ㎡, the cross-sectional area of ​​a single flow is 1.197×10 -3 ㎡.

10. The method for using the high-efficiency fully welded plate heat exchanger according to claim 1, characterized in that: The steps include: The heat exchanger is fed with the liquid to be exchanged, and then the heat exchange fluid medium is fed into the corrugated channels between the heat exchange plates. The inlet and outlet of the corrugated channels are connected so that the internal heat exchange fluid medium circulates from the inlet and outlet, and the heat exchange plates are in full contact with the liquid to be exchanged, so that the heat exchange fluid medium takes away the excess temperature inside the liquid, and the liquid after heat exchange is discharged, thereby improving the heat exchange efficiency between liquids.

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