A flue gas waste heat cascade recovery device for thermal power plants

Abstract

The utility model discloses a thermal power plant flue gas waste heat step recovery device, including the casing, the both ends of casing are provided with air inlet and air outlet respectively, a plurality of first through -hole are provided with in the lateral outer wall of casing, the corresponding place of first through -hole and the lateral outer wall of casing is provided with square tube all, the corresponding place of first through -hole and the outer wall of casing is connected with first mounting plate through bolt, the square tube is movably provided with second mounting plate, in the utility model, when the serpentine heat exchange tube needs to be maintained or cleaned, only need to remove the bolt of connecting first mounting plate and casing, can remove first mounting plate from the casing, fully conveniently take out the serpentine heat exchange tube from the casing by first through -hole, to the convenient maintenance of serpentine heat exchange tube, through the setting of sealing filler and pressure frame, can ensure the leakproofness between second mounting plate and square tube, to avoid flue gas from square tube place leak, and the use effect is good.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a cascade recovery device for waste heat from flue gas in thermal power plants. Background Technology

[0002] In order to fully tap the energy potential, improve overall efficiency, and reduce environmental impact, thermal power plants need to recover waste heat from flue gas in stages. Low-temperature economizers are one of the key devices for realizing waste heat recovery from flue gas, especially for cascade utilization. It is a heat exchange device installed in the flue at the tail end of the boiler to recover waste heat from exhaust gas.

[0003] Most low-temperature economizers currently in use consist of a metal shell and several heat exchange tube assemblies installed on the metal shell. The two ends of the heat exchange tubes are connected at one time through elbows to form a serpentine heat exchange channel, thereby improving heat exchange efficiency. However, most of the heat exchange tubes are expanded or welded to the shell. When dust accumulates on the surface of the heat exchange tubes inside the shell, it is not easy to clean them. Furthermore, when any heat exchange tube is damaged due to corrosion, it is not convenient to repair or replace it. These issues need to be addressed. Utility Model Content

[0004] The purpose of this invention is to provide a cascade recovery device for waste heat from flue gas in thermal power plants, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A waste heat recovery device for flue gas in a thermal power plant includes a shell with an air inlet and an air outlet at both ends. Multiple first through-holes are provided through one side of the outer wall of the shell. A square tube is provided at the corresponding position of each first through-hole on the other side of the outer wall of the shell. A first mounting plate is bolted to the corresponding position of each first through-hole on the outer wall of the shell. A second mounting plate is movably installed inside each square tube. A serpentine heat exchange tube is fixedly installed on both the first and corresponding second mounting plates. An inner frame is fixedly connected to the outer wall of the second mounting plate facing outwards from the shell. A sealing filler is provided between the inner frame and the square tube. A connecting frame is connected to the end flange of the square tube. A pressure frame is fixedly connected to the connecting frame facing outwards from the inner wall of the square tube. The sealing filler is located between the pressure frame and the second mounting plate.

[0007] As a further embodiment of this utility model: the serpentine heat exchange tube includes a plurality of parallel heat exchange tubes, the two ends of the heat exchange tubes are fixedly installed on the corresponding first mounting plate and second mounting plate, and the ends of adjacent heat exchange tubes are connected in sequence through a bend.

[0008] As a further embodiment of this utility model: the outer wall of the heat exchange tube located between the first mounting plate and the second mounting plate is fixedly fitted with spiral fins.

[0009] As a further embodiment of this utility model: multiple guide plates are fixedly installed inside the housing, and a ventilation groove is formed between every two adjacent guide plates. The first through-hole and the square tube are located on both sides of the corresponding ventilation groove, and the serpentine heat exchange tube passes through the corresponding ventilation groove.

[0010] As a further embodiment of this utility model: an inlet water distribution pipe and an outlet water manifold are fixedly installed on the outer wall of the shell. An inlet water interface is installed on the inlet water distribution pipe, and an outlet water interface is installed on the outlet water manifold. Several pipe joints are installed on both the inlet water distribution pipe and the outlet water manifold. The two ends of the serpentine heat exchange tube are connected to the corresponding pipe joints through connecting elbows.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] In this invention, when the serpentine heat exchange tube needs maintenance or cleaning, simply remove the bolts connecting the first mounting plate and the shell to remove the first mounting plate from the shell. This allows the serpentine heat exchange tube to be easily pulled out of the shell from the first opening, facilitating maintenance of the serpentine heat exchange tube. The sealing filler and pressure frame ensure the sealing between the second mounting plate and the square tube, preventing flue gas leakage from the square tube, resulting in good performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a cascade recovery device for waste heat from flue gas in a thermal power plant.

[0014] Figure 2 This is a schematic diagram showing the distribution of the first inlet in a cascade recovery device for waste heat from flue gas in a thermal power plant.

[0015] Figure 3 This is a schematic diagram of the distribution of guide plates in a cascade recovery device for waste heat from flue gas in a thermal power plant.

[0016] Figure 4 This is a schematic diagram of the ventilation duct in a waste heat recovery device for flue gas in a thermal power plant.

[0017] The components include: shell 1, air inlet 2, air outlet 3, guide plate 4, ventilation slot 5, first through-hole 6, square tube 7, first mounting plate 8, second mounting plate 9, heat exchange tube 10, spiral fins 11, bend 12, inner frame 13, sealing filler 14, connecting frame 15, pressure frame 16, inlet water distribution pipe 17, water inlet interface 18, water outlet manifold 19, water outlet interface 20, and connecting elbow 21. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 In this embodiment of the present invention, a waste heat recovery device for flue gas in a thermal power plant includes a housing 1. An air inlet 2 and an air outlet 3 are respectively provided at both ends of the housing 1. Multiple first through-holes 6 are provided through one side of the outer wall of the housing 1. A square tube 7 is provided at the corresponding position of each of the first through-holes 6 on the other side of the outer wall of the housing 1. A first mounting plate 8 is bolted to the corresponding position of each of the first through-holes 6 on the outer wall of the housing 1. A second mounting plate 9 is movably disposed inside the square tube 7. A serpentine heat exchange tube is fixedly installed on both the first mounting plate 8 and the corresponding second mounting plate 9. An inner frame 13 is fixedly connected to the outer wall of the second mounting plate 9 facing outwards from the housing 1. A sealing filler 14 is provided between the inner frame 13 and the square tube 7. A connecting frame 15 is connected to the end flange of the square tube 7. A pressure frame 16 is fixedly connected to the connecting frame 15 facing outwards from the inner wall of the square tube 7. The sealing filler 14 is located between the pressure frame 16 and the second mounting plate 9.

[0020] By adopting the above-mentioned scheme, this utility model allows for the recycling of waste heat from the serpentine heat exchange tubes during use. After the heat exchange medium is circulated into the serpentine heat exchange tubes, the flue gas is introduced into the housing 1 through the air inlet 2 and discharged through the air outlet 3. When the serpentine heat exchange tubes require maintenance or cleaning, simply remove the bolts connecting the first mounting plate 8 and the housing 1 to remove the first mounting plate 8 from the housing 1. This facilitates the easy extraction of the serpentine heat exchange tubes from the housing 1 through the first through-hole 6, enabling convenient maintenance. The sealing packing 14 and the pressure frame 16 ensure a tight seal between the second mounting plate 9 and the square tube 7, preventing flue gas leakage from the square tube 7. The overall performance is excellent.

[0021] Specific combination Figure 1 In one embodiment of the present invention, the serpentine heat exchange tube includes a plurality of parallel heat exchange tubes 10. The two ends of the heat exchange tubes 10 are fixedly installed on the corresponding first mounting plate 8 and second mounting plate 9, and the ends of adjacent heat exchange tubes 10 are connected in sequence through a bend 12.

[0022] Furthermore, the heat exchange tube 10 is provided with spiral fins 11 fixedly sleeved on its outer wall between the first mounting plate 8 and the second mounting plate 9. The spiral fins 11 can improve the heat exchange efficiency between the heat exchange tube 10 and the flue gas.

[0023] Specific combination Figure 3 and Figure 4 In one embodiment of the present invention, a plurality of guide plates 4 are fixedly installed inside the housing 1, and a ventilation groove 5 is formed between every two adjacent guide plates 4. The first through-hole 6 and the square tube 7 are located on both sides of the corresponding ventilation groove 5, and the serpentine heat exchange tube passes through the corresponding ventilation groove 5.

[0024] By setting the guide plate 4 and the ventilation slot 5, the gap between adjacent serpentine heat exchange tubes in the shell 1 can be effectively reduced, so that the flue gas can effectively contact each serpentine heat exchange tube and improve the recovery rate of waste heat.

[0025] Specific combination Figure 1 , Figure 2 and Figure 4 In one embodiment of this utility model, an inlet water distribution pipe 17 and an outlet water manifold 19 are fixedly installed on the outer wall of the housing 1. An inlet water interface 18 is installed on the inlet water distribution pipe 17, and an outlet water interface 20 is installed on the outlet water manifold 19. Several pipe joints are installed on both the inlet water distribution pipe 17 and the outlet water manifold 19. The two ends of the serpentine heat exchange tube are connected to the corresponding pipe joints through connecting elbows 21.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cascade recovery device for waste heat from flue gas in a thermal power plant, characterized in that: The enclosure includes a housing (1), with an air inlet (2) and an air outlet (3) at both ends. Multiple first through-holes (6) are provided through one side of the outer wall of the housing (1). Square tubes (7) are provided at the corresponding locations of the first through-holes (6) on the other side of the outer wall of the housing (1). A first mounting plate (8) is bolted to the corresponding location of the first through-holes (6) on the outer wall of the housing (1). A second mounting plate (9) is movably disposed inside the square tubes (7). The first mounting plate (8) and... A serpentine heat exchange tube is fixedly installed on the corresponding second mounting plate (9). An inner frame (13) is fixedly connected to the outer wall of the second mounting plate (9) facing the outer side of the shell (1). A sealing filler (14) is provided between the inner frame (13) and the square tube (7). A connecting frame (15) is connected to the end flange of the square tube (7). A pressure frame (16) is fixedly connected to the outer wall of the connecting frame (15) facing the inner side of the square tube (7). The sealing filler (14) is located between the pressure frame (16) and the second mounting plate (9).

2. The waste heat recovery device for flue gas in a thermal power plant according to claim 1, characterized in that: The serpentine heat exchange tube includes several parallel heat exchange tubes (10). The two ends of the heat exchange tubes (10) are fixedly installed on the corresponding first mounting plate (8) and second mounting plate (9). The ends of adjacent heat exchange tubes (10) are connected in sequence through a bend (12).

3. The waste heat recovery device for flue gas in a thermal power plant according to claim 2, characterized in that: The heat exchange tube (10) is fixedly fitted with spiral fins (11) on its outer wall between the first mounting plate (8) and the second mounting plate (9).

4. The waste heat recovery device for flue gas in a thermal power plant according to claim 1, characterized in that: Multiple guide plates (4) are fixedly installed inside the housing (1). A ventilation groove (5) is formed between every two adjacent guide plates (4). The first through-hole (6) and the square tube (7) are located on both sides of the corresponding ventilation groove (5). The serpentine heat exchange tube passes through the corresponding ventilation groove (5).

5. A waste heat recovery device for flue gas in a thermal power plant according to claim 1, characterized in that: The outer wall of the shell (1) is fixedly installed with an inlet water distribution pipe (17) and an outlet water manifold (19). The inlet water distribution pipe (17) is equipped with an inlet water interface (18), and the outlet water manifold (19) is equipped with an outlet water interface (20). Both the inlet water distribution pipe (17) and the outlet water manifold (19) are equipped with several pipe joints. The two ends of the serpentine heat exchange tube are connected to the corresponding pipe joints through connecting elbows (21).

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