A high efficiency heat exchanger

Abstract

The utility model relates to the field of heat exchangers, and provides a high-efficiency heat exchanger, which is composed of a cylinder, a plate bundle, and an E-shaped baffle. The internal space of the cylinder is arranged with a plurality of plate bundles arranged in parallel along the central axis of the cylinder, and the plate bundle is composed of a plurality of single plate-pass channels. A gap is left between two adjacent plate bundles in the internal space of the cylinder to form a shell-pass channel, which saves the pressure-bearing arrangement of the single-side fluid, optimizes the manufacturing process of the plate-fin heat exchanger, and is easy to manufacture and repair. At the same time, the circular cylinder has better pressure resistance. The high-strength, high-corrosion-resistant, and low-thermal-conductivity materials are used as pressure-bearing components, and high-thermal-conductivity and low-strength performance materials are used as auxiliary heat-conducting components. Between two adjacent single plate-pass channels or at any opening position of a single plate-pass channel, at least one layer of high-thermal-conductivity metal sheets is continuously or discontinuously embedded along the direction of a single fluid channel to form an auxiliary high-thermal-conductivity metal sheet connected to the cold and hot temperature zones or connected to the internal space of the cold and hot channels. The advantage is that the effective utilization rate of the unit space is optimized, thereby increasing the effective heat exchange area and enhancing the heat exchange efficiency.

Description

Technical Field

[0001] The utility model application relates to the field of heat exchangers, in particular to a plate-fin heat exchanger. Background Art

[0002] A heat exchanger is a space where two or more fluids at different temperatures are separated by heat exchange walls. Heat is exchanged between two or more fluids at different temperatures through heat conduction through the heat exchange walls and fins.

[0003] Existing plate-fin heat exchangers have the disadvantages of complex structure, weak pressure bearing capacity, complex manufacturing process, poor adaptability to high pressure and corrosive environment, and difficulty in maintenance. Summary of the invention

[0004] The purpose of the utility model is to solve the deficiencies of the prior art and provide a high-efficiency heat exchanger, which is composed of a plurality of individual plate-side channels arranged in parallel and close together and welded to form a plate bundle, with gaps left between the plate bundles to form a shell-side channel, thereby eliminating the need for a pressure-bearing arrangement for a single-side fluid, optimizing the manufacturing process and manufacturing cost of the plate-fin heat exchanger, facilitating manufacture and maintenance, and at the same time the circular cylinder has better pressure resistance.

[0005] A high-efficiency heat exchanger uses high-strength, high-corrosion resistance, and low thermal conductivity materials as pressure-bearing components, and high-thermal conductivity, low-strength materials as auxiliary thermal conductive components to adapt to different working conditions such as high temperature, high pressure, and corrosion. For example, metal materials such as stainless steel, titanium, and nickel have the advantages of high pressure bearing capacity and strong corrosion resistance, but poor thermal conductivity, and are suitable as pressure-bearing and corrosion-resistant materials. Copper has excellent thermal conductivity, but its pressure bearing capacity is not as good as that of stainless steel and other materials, and is suitable as a thermal conductive material.

[0006] A high-efficiency heat exchanger, which arranges several rectangular tubes, square steel and other shaped materials in parallel and closely, and continuously or discontinuously embeds at least one layer of high thermal conductivity metal sheet between the contact surfaces of two adjacent isothermal fluid channels along the direction of the fluid channel, and forms an auxiliary high-speed heat conduction channel connected to the cold and hot temperature zones through welding. The high thermal conductivity metal sheet can quickly transfer the heat of the contact surfaces of two adjacent rectangular tubes, square tubes, etc. to the shell-side fluid, and release heat and absorb heat conversely. The advantage is that it optimizes the effective utilization rate of unit space, thereby increasing the effective heat exchange area and improving the heat exchange efficiency.

[0007] A high-efficiency heat exchanger is formed by arranging a number of C-shaped, I-shaped and other shaped materials with openings in the same direction in parallel and closely to form a plate bundle. Any position of a single plate-side channel of the combined plate bundle has continuous or intermittent openings along the direction of a single fluid channel, and at least one layer of high thermal conductivity metal sheets is embedded in the internal channel space of the C-shaped, I-shaped and other open shaped materials, and the contact surfaces of adjacent single channels are brazed to form an auxiliary high-speed heat conduction channel connected from the internal space of the shell-side channel to the internal space of the plate-side channel. The high thermal conductivity metal sheets in the cold and hot medium channel spaces can be folded or bent. The advantage is that the heat exchange area of ​​the heat exchanger can be effectively increased and the heat exchange performance can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a front schematic diagram of the parallel mode of an embodiment of the utility model.

[0009] Figure 2 It is a side schematic diagram of the parallel mode of an embodiment of the utility model.

[0010] Figure 3 It is a cross-sectional top view schematic diagram of the parallel mode of an embodiment of the utility model.

[0011] Figure 4 It is a schematic diagram of the internal channel arrangement of the series mode plate bundle in an embodiment of the utility model.

[0012] Figure 5 It is a schematic diagram of the internal channel arrangement of the series-parallel mode plate bundle in an embodiment of the utility model.

[0013] Figure 6 It is a front schematic diagram of the series connection and series-parallel connection modes of the embodiment of the utility model.

[0014] Figure 7 It is a side schematic diagram of the series connection and series-parallel connection modes of the embodiment of the utility model.

[0015] Figure 8 It is a schematic diagram of the installation of the E-shaped baffle in the embodiment of the utility model.

[0016] Fig. 9 It is a schematic cross-sectional view of a rectangular tube continuously embedded with a high thermal conductivity metal sheet according to an embodiment of the utility model.

[0017] Fig.10 It is a schematic cross-sectional view of a C-shaped material continuously embedded in a high thermal conductivity metal sheet according to an embodiment of the utility model.

[0018] Fig.11 It is a schematic cross-sectional view of an embodiment of the utility model in which the I-shaped material is continuously embedded in a high thermal conductivity metal sheet.

[0019] Fig.12 It is a schematic cross-sectional view of a rectangular tube intermittently embedded with a high thermal conductivity metal sheet according to an embodiment of the utility model.

[0020] In the figure: cylinder 1; plate-side fluid inlet 2; plate-side fluid outlet 3; shell-side fluid inlet 4; shell-side fluid outlet 5; plate-side channel 6; shell-side channel 7; corrugated compensator 8; plate bundle compensation bend 9; flange 10; head collecting box 11; head diverter box 12; plate bundle 13; series plate bundle inlet 14; series plate bundle outlet 15; series-parallel plate bundle inlet 16; series-parallel plate bundle outlet 17; plate bundle arc side seal 18; rectangular tube 19; C-shaped material 20; I-shaped material 21; high thermal conductivity metal sheet 22; fin 23; shell-side upper sealing plate 24; shell-side lower sealing plate 25; plate bundle fluid inlet 26; plate bundle fluid outlet 27; E-shaped baffle 28; rabbit fork collecting box 29; rabbit fork diverter box 30; partition 31; upper head collecting box 32; lower head collecting box 33; upper rabbit fork diverter box 34; lower rabbit fork diverter box 35. DETAILED DESCRIPTION

[0021] In order to make the technical solutions of various embodiments of the present invention clearer, a complete description will be given below in combination with the drawings, technical solutions and features of the embodiments of the present invention.

[0022] Embodiment 1 of the present utility model, as Figure 1 , Figure 2 , Figure 3 As shown, each figure expresses a schematic diagram of a high-efficiency heat exchanger in parallel mode, wherein a plurality of plate-side channels 6 are arranged longitudinally along the central axis of the cylinder 1, a plurality of plate bundles 13 in the cylinder 1 are arranged parallel to the central axis of the cylinder 1, a plurality of single plate-side channels 6 are arranged parallel and closely welded to form a plate bundle 13, a plurality of plate bundles 13 are combined and welded with a shell-side upper sealing plate 24 and a shell-side lower sealing plate 25 to form a heat exchange core, a gap is left between two adjacent plate bundles 13, and a plurality of shell-side channels 7 are formed, and then the combination is positioned. The heat exchange core is placed in the cylinder 1, and several shell-side channels 7 in the cylinder 1 are interconnected to balance the pressure. The outward pressure of the shell-side fluid is borne by the cylinder 1. The hot fluid passes through the plate-side fluid inlet 2 and enters the head diverter box 12. The head diverter box 12 is connected with several plate-side channels 6. Several plate-side channels 6 are connected with the head collecting box 11. The hot fluid enters several plate-side channels 6 through the head diverter box 12 and then reaches the head collecting box 11. The head collecting box 11 collects the hot fluid after heat exchange and discharges it through the plate-side fluid outlet 3.

[0023] The cold fluid passes through the shell-side fluid inlet 4 and enters the rabbit-fork diverter box 30. The rabbit-fork diverter box 30 is connected to a number of shell-side channels 7. The several shell-side channels 7 are connected to the rabbit-fork collecting box 29. The cold fluid passes through the rabbit-fork diverter box 30 and enters a number of shell-side channels 7, and then reaches the rabbit-fork collecting box 29. The rabbit-fork collecting box 29 collects the cold fluid after heat exchange and discharges it through the shell-side fluid outlet 5.

[0024] Part of the heat of the hot fluid is transferred to the partition 31 through the fins 23, and part of the heat is directly absorbed by the partition 31, and finally transferred to the cold fluid by the partition 31, thereby achieving the purpose of heat exchange.

[0025] A corrugated compensator 8 is arranged on the cylinder 1 to eliminate the thermal expansion stress generated by the temperature difference between the cylinder 1 and the plate bundle 13 during operation.

[0026] The cylinder 1, the head collecting box 11, and the head distributing box 12 are all provided with flanges 10, and the two flanges are connected by bolts to facilitate maintenance and cleaning of the plate passage 6.

[0027] The cold and hot fluids are separated by the upper shell-side sealing plate 24, the lower shell-side sealing plate 25, and the plate bundle 13.

[0028] Embodiment 2 of the present utility model, as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, each figure expresses a high-efficiency heat exchanger, a schematic diagram of the series and series-parallel modes, a plurality of plate-pass channels 6 are arranged horizontally along the central axis of the cylinder 1, and a plurality of plate bundles 13 in the cylinder 1 are arranged parallel to the central axis of the cylinder 1. Since the cylinder 1 is arranged in a circular shape, the central plate bundle 13 is wider than the plate bundles 13 on the side. It is difficult to balance the time and channel travel length of the fluid passing through each plate bundle 13, as well as the outlet temperature of each plate bundle 13 by adopting a single series or series-parallel mode. The number of series, series-parallel and series-parallel single plate-pass channels 6 is combined, and the number of series-parallel single plate-pass channels 6 of wide plate bundles 13 is greater than the number of series-parallel single plate-pass channels 6 of narrow plate bundles 13, which can solve this problem. The plurality of shell-pass channels 7 are interconnected, and the requirements of the series and series-parallel modes can be met by adjusting the distance between two adjacent E-shaped baffles 28 and increasing or decreasing the number of E-shaped baffles 28.

[0029] The hot fluid passes through the plate fluid inlet 2 and enters the upper rabbit fork shunt box 34, which is connected to the fluid inlets 26 of the plurality of series and series-parallel plate bundles. The hot fluid passes through the plurality of plate bundle compensation bends 9 and enters the plurality of series and series-parallel plate channel 6. For the internal channel arrangement of the plate bundle 13, please refer to Figure 4 , Figure 5 The hot fluid after heat exchange enters the lower head collecting box 33 through the plate bundle fluid outlet 27, and is then discharged through the plate side fluid outlet 3.

[0030] The cold fluid passes through the shell-side fluid inlet 4 and enters the lower rabbit-fork splitter box 35. The lower rabbit-fork splitter box 35 is connected to a number of shell-side channels 7. The cold fluid enters a number of shell-side channels 7 and forms a series of shell-side channels 7 under the action of the E-shaped baffle 28. After the cold fluid passes through the last E-shaped baffle 28, the cold fluid after heat exchange enters the upper head collecting box 32, and the cold fluid after heat exchange is discharged through the shell-side fluid outlet 5.

[0031] The contact points of several E-shaped baffles 28 and plate bundles 13 can be fixed to each other by spot welding to form a heat exchange core. The assembled heat exchange core of several plate bundles 13 is placed in the cylinder 1, and the contact surfaces of several plate bundles 13 and the lower sealing plate 25 of the shell are all sealed and welded, and the contact surfaces of the lower sealing plate 25 of the shell and the cylinder 1 are all sealed and welded. In this way, a heat exchange core is formed with the lower sealing plate 25 of the shell as a fixed point and the E-shaped baffles 28 as a limiting guide support, which can be extended and retracted up and down along the central axis of the cylinder 1. The expansion stress acts on several plate bundle compensation bends 9. When the expansion stroke is too large, the number of plate bundle compensation bends 9 can be increased, such as S bends.

[0032] In Example 2 of the utility model, the series and series-parallel modes are suitable for clean fluids, gas / gas heat exchange, gas / liquid heat exchange, or liquid, gas / gas, liquid phase change fluid heat exchange.

[0033] Embodiment 3 of the present invention When the plate passage 6 has two or more cold fluids or hot fluids, Figure 6 , Figure 7 The plate bundle 13 is adjusted, several plate bundles 13 are selected according to the flow rate, and they are turned over. The plate bundle fluid inlet 26 is turned 180°, and another plate-side fluid inlet 2 is added opposite to the plate-side fluid inlet 2. A plate bundle elbow is added to the plate-side fluid outlets 27 of the turned-over plate bundles 13, and the plate-side fluid outlets 27 are collected on the upper or lower head collecting box 33 of the cylinder 1, and holes are opened for welding, and another plate-side fluid outlet 3 is added. The plate-side fluid inlet and outlet are arranged in the middle of the cylinder 1, and the plate-side channel can meet the simultaneous heat exchange of two or more cold fluids or hot fluids.

[0034] When there are two or more cold fluids or hot fluids in the shell channel 7, the number and flow rate of the cold fluids or hot fluids can be adjusted. Figure 6 , Figure 7 A sealing isolation plate is added at a suitable position inside the cylinder 1, from the lower shell sealing plate 25 along the cylinder 1 to the upper head collecting box 32, to separate different media in the shell channel 7, and then the corresponding shell fluid inlet 4, lower rabbit fork diverter box 35 and shell fluid outlet 5 are added, and the E-shaped baffle 28 is divided into corresponding equal parts. Due to the poor pressure bearing capacity of the sealing isolation plate, the operating pressure difference cannot be too large. When starting or stopping the operation, two or more cold fluids or hot fluids should be gradually pressurized or depressurized at the same time to ensure safe operation.

[0035] In the fourth embodiment of the utility model, since the plurality of individual plate passages 6 of the plate bundle 13 are arranged at the same temperature, in order to allow the fins 23 to achieve the best heat conduction effect and increase the heat exchange area of ​​the heat exchanger, as shown in FIG. Fig. 9 , Fig.10 , Fig.11 , Fig.12 As shown, each figure expresses various combinations of rectangular tubes 19, C-shaped materials 20, I-shaped materials 21, etc. and high thermal conductivity metal sheets 22, and forms a plate bundle 13. The plate passage 6 of various shaped materials is made of high-strength, high-corrosion-resistant, low thermal conductivity materials, such as stainless steel, titanium, nickel, etc. The high thermal conductivity metal sheet 22 is a high thermal conductivity material, such as silver, copper, aluminum, tungsten, zinc, etc. The plate passage 6 formed by the combination and non-combination of various shaped materials has pressure bearing and heat conduction functions, and the high thermal conductivity metal sheet 22 has heat conduction and flow disturbance functions.

[0036] The high thermal conductivity metal sheet 22 is a metal mesh sheet or a metal plate, a metal sheet, a metal foil, etc. formed by a manufacturing process such as stamping, stretching, and weaving.

[0037] like Fig. 9 , Fig.12 As shown in the figure, a rectangular tube 19 and a plate bundle arc side seal 18 are formed. Between two adjacent single plate-side channels, at least one layer of high thermal conductivity metal sheet 22 is continuously or discontinuously embedded along the direction of a single fluid channel to form a high thermal conductivity metal sheet 22 connected to the cold and hot temperature zones. The high thermal conductivity metal sheet 22 quickly conducts the heat of the adjacent fins 23 to the cold fluid in the shell-side channel 7. A number of rectangular tubes 19 are arranged in parallel, embedded in the high thermal conductivity metal sheet 22 and pressed tightly, and the contact surfaces are brazed to form a plate bundle 13. Laser welding or argon arc welding can also be used to directly weld the discontinuous positions.

[0038] like Fig.10 , Fig.11 The C-shaped material 20 and the I-shaped material 21 are arranged in parallel with the same opening direction and continuously embedded with at least one layer of high thermal conductivity metal sheet 22. Of course, the C-shaped material 20 and the I-shaped material 21 can also be cut intermittently, and at least one layer of high thermal conductivity metal sheet 22 can be intermittently embedded, and then pressed and brazed to form a plate bundle 13.

[0039] The composition of the plate bundle 13 described above is not limited to the rectangular tube 19, C-shaped material 20, and I-shaped material 21. L-shaped material, Z-shaped material, flat tube, square tube, triangular tube, hexagonal tube and other shaped materials can also be used to combine into the plate bundle 13. The plate bundle 13 adopts the plate bundle arc side seal 18, which can make the plate bundle 13 better adapt to the high-pressure environment.

[0040] The above embodiments can be combined with each other according to different working conditions to adapt to different working conditions such as high temperature, high pressure, corrosion and simultaneous heat exchange of multiple media fluids. The cold and hot medium channels of embodiments 1 and 2 can be interchanged.

Claims

1. A high-efficiency heat exchanger, comprising a high-thermal-conductivity metal sheet and a plate-pass channel, characterized in that: At least one layer of high thermal conductivity metal sheet is continuously or discontinuously embedded between the two plate-pass channels or at any opening position of the plate-pass channel along the direction of the fluid channel to form an auxiliary high thermal conductivity metal sheet connected to the cold and hot temperature zones.

2. A high efficiency heat exchanger according to claim 1, characterized in that: The high thermal conductivity metal sheet connected to the inner space of the hot and cold channels can be folded or bent.

3. A high efficiency heat exchanger according to claim 1, characterized in that: The high thermal conductivity metal sheet is a metal plate, a metal sheet, a metal foil or a metal mesh sheet obtained by stamping, stretching or weaving.

4. A high efficiency heat exchanger according to claim 1, characterized in that: The high thermal conductivity metal sheet is any one of silver, copper, aluminum, tungsten and zinc.

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