Modularized plate type gas-gas heat exchanger

Abstract

The utility model discloses a modularized plate type gas-gas heat exchanger which comprises an air inlet chamber, an air outlet chamber, a low-temperature heat exchange module, a high-temperature heat exchange module and a steering chamber assembly, an air outlet of the air inlet chamber is communicated with the top of the low-temperature heat exchange module, and the bottom end of the low-temperature heat exchange module is communicated with an air inlet of the steering chamber assembly. An air inlet of the air outlet chamber communicates with the top of the high-temperature heat exchange module, and the bottom end of the high-temperature heat exchange module communicates with an air outlet of the steering chamber assembly. The heat exchange plates are used for replacing the heat exchange tubes to form the low-temperature heat exchange module and the high-temperature heat exchange module, so that a larger heat exchange area can be arranged in the same space compared with a tubular heat exchanger, and more efficient waste heat recovery is realized.

Description

Technical Field

[0001] This utility model relates to the field of gas-to-gas heat exchanger technology, specifically to a modular plate gas-to-gas heat exchanger. Background Technology

[0002] In metallurgical heating furnaces, the high-temperature flue gas generated by fuel combustion carries a large amount of heat energy; direct emission would result in serious energy waste. Air preheaters utilize this high-temperature flue gas to heat the combustion air, reducing fuel consumption and pollution emissions. With the metallurgical industry's increasing demands for energy efficiency and environmental protection, higher requirements are being placed on waste heat recovery systems. As the equipment with the highest heat load in the waste heat recovery system, the air preheater plays a crucial role in energy conservation.

[0003] As air preheaters, gas-to-gas heat exchangers commonly take the form of tubular or plate heat exchangers, using round tubes or flat plates as heat exchange elements. The application of both types of heat exchangers in the high-temperature, confined spaces of metallurgical heating furnace flues is limited by their structural characteristics: tubular heat exchangers have a small heat exchange area that can be arranged within a given space, resulting in lower efficiency; plate heat exchangers' plates are unable to withstand the thermal deformation generated at high temperatures, leading to a short lifespan. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a modular plate gas-to-gas heat exchanger, which solves the problem that the heat exchange area that can be arranged in a given space is small in existing tubular heat exchangers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A modular plate-type air-to-air heat exchanger is provided, comprising an air inlet chamber, an air outlet chamber, a low-temperature heat exchange module, a high-temperature heat exchange module, and a turning chamber assembly. The air outlet of the air inlet chamber is connected to the top of the low-temperature heat exchange module, the bottom of the low-temperature heat exchange module is connected to the air inlet of the turning chamber assembly, the air inlet of the air outlet chamber is connected to the top of the high-temperature heat exchange module, and the bottom of the high-temperature heat exchange module is connected to the air outlet of the turning chamber assembly.

[0007] This invention replaces heat exchange tubes with heat exchange plate assemblies to form low-temperature heat exchange modules and high-temperature heat exchange modules, thereby allowing for a larger heat exchange area to be arranged in the same space compared to tubular heat exchangers, achieving more efficient waste heat recovery.

[0008] Furthermore, both the low-temperature heat exchange module and the high-temperature heat exchange module include two oppositely arranged load-bearing side plates, and the load-bearing side plates are provided with multi-layer heat exchange plate assemblies.

[0009] Two connecting plates are installed between the tops of the two load-bearing side plates and are connected to the air outlet of the air inlet chamber or the air inlet of the air outlet chamber.

[0010] Two connecting plates are installed between the bottom ends of the two load-bearing side plates and are connected to the air outlet or air inlet of the steering chamber assembly.

[0011] Furthermore, multiple layers of supporting beams are provided between the two load-bearing side plates. Each layer of supporting beams includes two movable beams, and the ends of the movable beams that pass through the load-bearing side plates are provided with beam end caps. The heat exchange plate assembly is installed on the two movable beams.

[0012] Furthermore, the steering chamber assembly includes a first steering chamber and a second steering chamber connected at the bottom;

[0013] The air inlet at the top of the first turning chamber is connected to the bottom of the two load-bearing side plates of the low-temperature heat exchange module; the air outlet at the top of the second turning chamber is connected to the bottom of the two load-bearing side plates of the high-temperature heat exchange module.

[0014] Furthermore, the first steering chamber and the second steering chamber are connected by an expansion joint.

[0015] Furthermore, the device includes a hanger assembly comprising two first channel steels, the two ends of which are connected by a second channel steel; the first channel steels are mounted on the load-bearing side plate via a connecting plate.

[0016] Furthermore, lifting lugs are provided on the first channel steel.

[0017] This utility model discloses a modular plate gas-to-gas heat exchanger, the advantages of which are:

[0018] 1. This utility model replaces heat exchange tubes with heat exchange plate assemblies to form low-temperature heat exchange modules and high-temperature heat exchange modules, thereby allowing for a larger heat exchange area to be arranged in the same space compared to tubular heat exchangers, achieving more efficient waste heat recovery.

[0019] 2. In this utility model, the size of the heat exchange plates in the modular heat exchange plate group is relatively smaller than that in the whole plate heat exchange plate group, so that the deformation of a single heat exchange plate is smaller, making it less likely for the overall deformation to accumulate and cause damage to the overall structure, thereby improving the overall life of the heat exchanger. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a modular plate gas-to-gas heat exchanger according to the present invention.

[0021] Figure 2 This is a schematic diagram of the high-temperature heat exchange module of this utility model.

[0022] Figure 3 This is a schematic diagram of the heat exchange plate assembly of this utility model.

[0023] Figure 4This is a schematic diagram of the steering chamber assembly of this utility model.

[0024] The components include: 1. Air inlet chamber; 2. Air outlet chamber; 3. Low-temperature heat exchange module; 31. Load-bearing side plate; 32. Heat exchange plate assembly; 33. Connecting upper plate; 34. Connecting lower plate; 35. Movable crossbeam; 36. Crossbeam end cover; 4. High-temperature heat exchange module; 5. Steering chamber assembly; 51. First steering chamber; 52. Second steering chamber; 53. Expansion joint; 61. First channel steel; 62. Second channel steel; 63. Connecting plate; 64. Lifting lug. Detailed Implementation

[0025] The present invention is described in detail with respect to specific embodiments in order to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, any changes that are within the spirit and scope of the present invention as defined and determined by the appended claims are obvious. All utility model creations utilizing the concept of the present invention are protected.

[0026] Example 1

[0027] refer to Figures 1-4 This embodiment provides a modular plate gas-to-gas heat exchanger, the purpose of which is to solve the problem that the heat exchange area that can be arranged in a given space is small in existing tubular heat exchangers. The specific structure of this embodiment will be described in detail below.

[0028] A modular plate air-to-air heat exchanger includes an air inlet chamber 1, an air outlet chamber 2, a low-temperature heat exchange module 3, a high-temperature heat exchange module 4, and a deflection chamber assembly 5.

[0029] Specifically, the air outlet of the air inlet chamber 1 is connected to the top of the low-temperature heat exchange module 3, and the bottom of the low-temperature heat exchange module 3 is connected to the air inlet of the deflection chamber assembly 5.

[0030] The air inlet of the air outlet chamber 2 is connected to the top of the high-temperature heat exchange module 4, and the bottom of the high-temperature heat exchange module 4 is connected to the air outlet of the deflection chamber assembly 5.

[0031] In this embodiment, the integral heat exchanger plate assembly is modularized, and the heat exchange tubes are replaced by the heat exchanger plate assembly to form a modular low-temperature heat exchange module 3 and a high-temperature heat exchange module 4. This allows for a larger heat exchange area to be arranged in the same space compared to a tubular heat exchanger, achieving more efficient waste heat recovery. Air enters from the air inlet of the air inlet chamber 1, passes through the low-temperature heat exchange module 3 to the turning chamber assembly 5, then flows through the turning chamber assembly 5 to the high-temperature heat exchange module 4, and finally flows out from the air outlet chamber 2. The high-temperature flue gas passes sequentially through the flue gas side of the high-temperature heat exchange module 4 and the low-temperature heat exchange module 3. The flue gas and air are then heat-transferred through the plates in the high-temperature heat exchange module 4 and the low-temperature heat exchange module 3, with the flue gas heating the air, achieving an efficient, long-term, and stable air preheating effect, thereby realizing energy saving of the heating furnace system.

[0032] Specifically, both the low-temperature heat exchange module 3 and the high-temperature heat exchange module 4 include two oppositely arranged load-bearing side plates 31, and multi-layer heat exchange plate groups 32 are arranged on the load-bearing side plates 31.

[0033] Two connecting plates 33 are provided between the tops of the two load-bearing side plates 31, and are connected to the air outlet of the air inlet chamber 1 or the air inlet of the air outlet chamber 2.

[0034] Two connecting lower plates 34 are provided between the bottom ends of the two load-bearing side plates 31 and are connected to the air outlet or air inlet of the steering chamber assembly 5.

[0035] In this embodiment, the low-temperature heat exchange module 3 and the high-temperature heat exchange module 4 have the same structure, both including two load-bearing side plates 31. The two load-bearing side plates 31 are arranged opposite to each other, so that two connecting upper plates 33 are arranged between the top ends of the two load-bearing side plates 31, thereby forming an upper connecting frame. The upper connecting frame is connected to the air outlet of the air inlet chamber 1 or the air inlet of the air outlet chamber 2.

[0036] Two connecting lower plates 34 are provided between the bottom ends of the two load-bearing side plates 31, thus forming a lower connecting frame, which is connected to the air outlet or air inlet of the turning chamber assembly 5. This creates an air passage between the low-temperature heat exchange module 3 of the air inlet chamber 1, the turning chamber assembly 5, the high-temperature heat exchange module 4, and the air outlet chamber 2.

[0037] Specifically, multiple layers of support beams are provided between the two load-bearing side plates 31. Each layer of support beams includes two movable beams 35, and the ends of the movable beams 35 that pass through the load-bearing side plates 31 are provided with beam end caps 36. The heat exchange plate assembly 32 is provided on the two movable beams 35.

[0038] In this embodiment, multiple layers of support beams are provided in the height direction of the load-bearing side plate 31. Each layer of support beams includes two movable beams 35, and the movable beams 35 pass through the two load-bearing side plates 31. The movable beams 35 are prevented from moving by engaging the end caps 36 at the ends of the movable beams 35.

[0039] Multiple heat exchanger plate groups 32 all use plates with the same structure, 700mm long and 600mm high. Among them, the heat exchanger plate group 32 of the high-temperature heat exchange module 4 uses 1.2mm thick 310s stainless steel plates, and the heat exchanger plate group 32 of the low-temperature heat exchange module 3 uses 1.0mm thick 321 stainless steel plates. Each heat exchanger plate group 32 contains forty-six pairs of plates, and the edges of the forty-six pairs of plates are embedded in the grooves of the inserts to form the heat exchanger plate group 32. Two inserts on the same side are connected by a connecting frame, thereby placing and fixing each heat exchanger plate group 32 on two movable crossbeams 35. The size of the heat exchanger plates in the modular heat exchanger plate group 32 is relatively smaller than that in the integral plate heat exchanger plate group, so that the deformation of a single heat exchanger plate is smaller, thus making it less likely for the overall deformation to accumulate and damage the overall structure, thereby improving the overall life of the heat exchanger.

[0040] In this embodiment, both the low-temperature heat exchange module 3 and the high-temperature heat exchange module 4 are provided with three sets of heat exchange plate groups 32. The three sets of heat exchange plate groups 32 are stacked in the height direction, and the connecting upper plate 33 and the connecting lower plate 34 are connected to the connecting frame of the heat exchange plate groups 32 at both ends.

[0041] Optionally, the height of the connecting frame is greater than the height of the heat exchange plate assembly 32, so that when each heat exchange plate assembly 32 is placed and fixed on the two movable crossbeams 35, the extended connecting frame can engage with the two movable crossbeams 35.

[0042] Optionally, the connecting frame can be a flexible connecting piece. The modular heat exchange plate assembly 32 will thermally expand outwards under high-temperature operation. The flexible connecting piece, while deforming, restricts the position of the heat exchange plate assembly 32, providing a flexible connection and sealing / fixing function. The flexible connecting piece can be obtained by welding straight sections and corner sections to avoid cracking at bends.

[0043] Optionally, a guide vane is installed at the inlet of the flue gas passage of the heat exchange plate group 32 in the high-temperature heat exchange module 4. Both the horizontal and vertical guide vanes are installed on the connecting frame, and the guide vane in the middle is connected to the connecting frame of the adjacent heat exchange plate group 32.

[0044] Specifically, the steering chamber assembly 5 includes a first steering chamber 51 and a second steering chamber 52 connected at the bottom; the air inlet at the top of the first steering chamber 51 is connected to the bottom ends of the two load-bearing side plates 31 located in the low-temperature heat exchange module 3; the air outlet at the top of the second steering chamber 52 is connected to the bottom ends of the two load-bearing side plates 31 located in the high-temperature heat exchange module 4. The first steering chamber 51 and the second steering chamber 52 are connected by an expansion joint 53.

[0045] In this embodiment, there is also a difference in thermal expansion deformation between the low-temperature heat exchange module 3 and the high-temperature heat exchange module 4. The first steering chamber 51 and the second steering chamber 52 are connected by an expansion joint 53. The expansion joint 53 realizes the soft connection and sealing of the bottom structure of the first steering chamber 51 and the bottom structure of the second steering chamber 52, which can be used normally at high temperature.

[0046] Specifically, the hanger assembly includes two first channel steels 61, the two ends of which are connected by a second channel steel 62; the first channel steels 61 are mounted on the load-bearing side plate 31 via a connecting plate 63. Lifting lugs 64 are provided on the first channel steels 61.

[0047] In this embodiment, the device can be connected to the outside via a hanger assembly. Two first channel steels 61 and two second channel steels 62 are welded together to form a fixed frame. The fixed frame is installed on the load-bearing side plate 31 via four connecting plates 63. At the same time, two lifting lugs 64 are provided on the outside of the first channel steels 61, and the device is connected and fixed to the outside via the lifting lugs 64.

[0048] The working principle of this modular plate gas-to-gas heat exchanger is as follows:

[0049] In practical applications, the heat exchange plates stacked in the low-temperature heat exchange module 3 and the high-temperature heat exchange module 4 alternately divide the space into flue gas flow channels and air flow channels.

[0050] Flue gas enters the heat exchanger from the flue gas side of the high-temperature heat exchange module 4, and exits the heat exchanger after passing through the flue gas channels of the heat exchange plate assembly 32 in the high-temperature heat exchange module 4 and the heat exchange plate assembly 32 in the low-temperature heat exchange module 3. Air enters the heat exchanger from the air inlet chamber 1, and exits the heat exchanger from the air outlet chamber 2 after passing through the air channels of the heat exchange plate assembly 32 in the low-temperature heat exchange module 3, the deflection chamber assembly 5, and the air channels of the heat exchange plate assembly 32 in the high-temperature heat exchange module 4. Flue gas and air transfer heat through the plates in the heat exchange plate assembly 32, with the flue gas heating the air, achieving a highly efficient, long-term, and stable air preheating effect, thereby realizing energy saving in the heating furnace system.

[0051] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A modular plate gas-gas exchanger, characterized by: The air inlet chamber (1), the air outlet chamber (2), the low-temperature heat exchange module (3), the high-temperature heat exchange module (4) and the turning chamber assembly (5) are included. The air outlet of the air inlet chamber (1) is communicated with the top of the low-temperature heat exchange module (3), and the bottom end of the low-temperature heat exchange module (3) is communicated with the air inlet of the turning chamber assembly (5). The air inlet of the air outlet chamber (2) is communicated with the top of the high-temperature heat exchange module (4), and the bottom end of the high-temperature heat exchange module (4) is communicated with the air outlet of the turning chamber assembly (5).

2. The modular plate gas-to-gas heat exchanger of claim 1, wherein: The low-temperature heat exchange module (3) and the high-temperature heat exchange module (4) each include two oppositely arranged load-bearing side plates (31), and a plurality of layers of heat exchange plate groups (32) are arranged on the load-bearing side plates (31). Two connecting upper plates (33) are arranged between the top ends of the two load-bearing side plates (31) and are communicated with the air outlet of the air inlet chamber (1) or the air inlet of the air outlet chamber (2). Two connecting lower plates (34) are arranged between the bottom ends of the two load-bearing side plates (31) and are communicated with the air outlet or the air inlet of the turning chamber assembly (5).

3. The modular plate gas-to-gas heat exchanger of claim 2, wherein: A plurality of layers of support cross beams are arranged through the two load-bearing side plates (31), each layer of support cross beam includes two movable cross beams (35), and the movable cross beams (35) are provided with cross beam end covers (36) penetrating through the end portions of the load-bearing side plates (31); and the heat exchange plate groups (32) are arranged on the two movable cross beams (35).

4. The modular plate gas-to-gas heater of claim 2, wherein: The turning chamber assembly (5) includes a first turning chamber (51) and a second turning chamber (52) which are communicated at the bottom; The air inlet at the top end of the first turning chamber (51) is communicated with the bottom ends of the two load-bearing side plates (31) of the low-temperature heat exchange module (3); The air outlet at the top end of the second turning chamber (52) is communicated with the bottom ends of the two load-bearing side plates (31) of the high-temperature heat exchange module (4).

5. The modular plate gas-to-gas heater of claim 4, wherein: The first turning chamber (51) and the second turning chamber (52) are communicated through an expansion joint (53).

6. The modular plate gas-to-gas heater of claim 2, wherein: The hanger assembly includes two first channel steels (61), the two ends of the two first channel steels (61) are connected through a second channel steel (62), and the first channel steels (61) are installed on the load-bearing side plates (31) through connecting plates (63).

7. The modular plate gas-to-gas heater of claim 6, wherein: Lugs (64) are arranged on the first channel steels (61).

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