Flue gas waste heat recovery device of fuel gas thermal equipment

Abstract

The invention discloses a flue gas waste heat recovery device for fuel gas thermal equipment, and relates to the technical field of thermal equipment, the flue gas waste heat recovery device comprises a waste heat recovery mechanism, the bottom of the waste heat recovery mechanism is provided with a bottom plate, one end of the top of the bottom plate is provided with a filtering mechanism, and the filtering mechanism is arranged on the side of the waste heat recovery mechanism. The gas inlet is externally connected with gas thermal equipment, smoke is collected into the filter box, the filter element plate is matched with the filter holes to filter the smoke, dirt is reduced, the sealing cover is matched with the sealing ring to seal the top, smoke leakage is avoided, the two ends of the sealing cover are provided with the connecting openings, and the connecting openings are connected with the butt joint grooves in the filter box in a buckled mode. The function of quick assembly and disassembly is achieved, then the cleaning and replacing efficiency of the filter element plate is improved, the efficient filtering effect is guaranteed, the waste heat recovery performance is improved, and filtered flue gas is conveyed to a hot gas inlet through a connecting pipe and then input to a hot gas circulating pipe for waste heat recovery work.

Description

Technical Field

[0001] The invention relates to the technical field of thermal equipment, and in particular to a flue gas waste heat recovery device for gas thermal equipment. Background Art

[0002] Gas-fired thermal equipment generates a large amount of high-temperature flue gas during operation, which contains considerable heat. However, many gas-fired thermal equipment currently do not effectively recycle the waste heat from the flue gas, resulting in a large amount of energy being wasted.

[0003] In the prior art, such as the patent application number: CN202223000851.5, "A quick-install flue gas waste heat recovery integrated unit", the main components of the flue gas waste heat recovery system are integrated into a vertical heat exchange tower integral structure, in which the lower part of the integrated unit is a skid-mounted thermal module, and the middle and upper parts are flue gas spray heat exchangers. The flue gas from the boiler and its economizer enters the tower from the lower middle part of the tower and exchanges heat with the low-temperature waste water in countercurrent, and is discharged from the chimney section at the top of the tower; its high-temperature outlet water is sent to the lower skid-mounted thermal module and heats the heat network return water and process water, and then returns to the flue gas spray heat exchanger to continue to deeply cool and heat the flue gas. The flue gas waste heat recovery integrated unit can integrate the components of the flue gas waste heat recovery equipment and some pipelines into an integral device, greatly reducing the space occupied by the equipment, significantly shortening the on-site installation time, and reducing investment and operation and maintenance costs. It is suitable for flue gas waste heat recovery in scenarios such as small and medium-sized coal-fired boilers, gas boilers, biomass boilers and waste power plants.

[0004] After long-term recovery and use, the pipes of some existing flue gas waste heat recovery devices are prone to scaling and clogging, which in turn leads to reduced heat exchange efficiency and affects the waste heat recovery effect. To address the above problem, a flue gas waste heat recovery device for gas thermal equipment is proposed. Summary of the invention

[0005] The object of the present invention is to provide a flue gas waste heat recovery device for gas thermal equipment to solve the problem that the prior art proposed in the above background technology is prone to scaling and clogging during operation, thereby reducing the heat exchange efficiency and affecting the waste heat recovery effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waste heat recovery device for flue gas of a gas thermal power equipment, comprising a waste heat recovery mechanism, a bottom plate is arranged at the bottom of the waste heat recovery mechanism, a filter mechanism is arranged at one end of the top of the bottom plate, and the filter mechanism is arranged on the side of the waste heat recovery mechanism, the waste heat recovery mechanism comprises an outer shell, a water storage tank is arranged inside the outer shell, a hot air circulation pipe is wound and installed outside the water storage tank, a hot air inlet is fixedly connected to the bottom end of the hot air circulation pipe, the hot air inlet runs through the bottom of the outer shell, an exhaust port is fixedly connected to the top end of the hot air circulation pipe, and the exhaust port runs through the top of the outer shell, the water storage tank is arranged inside the outer shell and is evenly wound by the hot air circulation pipe, the hot air circulation pipe is connected to the upper air inlet through the hot air inlet, the waste heat is collected, and then distributed on the outside of the water storage tank through the hot air circulation pipe, providing an annular evenly distributed heat dissipation, the water source inside the water storage tank is heated by the dissipated heat, the waste heat recovery and utilization function is realized, and the exhaust port can be used to discharge the waste gas;

[0007] The filtering mechanism comprises a filter box, one end of which is fixedly connected with an air inlet, the other end of which is fixedly connected with a connecting pipe, one end of which is fixedly connected to the bottom of the hot gas inlet, a plurality of filter core plates are evenly distributed inside the filter box, a plurality of filter holes are evenly opened on the side of the filter core plate, a sealing cover is fixedly installed on the top of the filter core plate, connecting ports are fixedly installed on both ends of the sealing cover, a plurality of docking grooves are evenly distributed on both sides of the filter box, one end of the connecting port is buckled and connected to the inside of the docking groove, the air inlet is externally connected to a gas thermal device, the flue gas is collected into the inside of the filter box, the flue gas is filtered and processed by the filter core plate in conjunction with the filter holes to reduce dirt, the sealing cover is matched with a sealing ring to seal at the top to avoid flue gas leakage, the two ends of the sealing cover are provided with connecting ports which are buckled and connected with the docking grooves on the filter box to realize the function of rapid assembly and disassembly, thereby facilitating the cleaning and replacement efficiency of the filter core plate to ensure a high-efficiency filtering effect, thereby improving the waste heat recovery performance, the filtered flue gas is transported to the hot gas inlet through the connecting pipe, and then input into the hot gas circulation pipe for waste heat recovery.

[0008] Preferably, a thermal insulation layer is fixedly installed on the inner wall of the outer shell, and the thermal insulation layer is arranged on the outside of the hot air circulation pipe. The thermal insulation layer is wrapped around the outside of the water storage tank and the hot air circulation pipe, which is beneficial to provide thermal insulation during the waste heat recovery process, effectively improving the effect of heat accumulation, and thus improving the efficiency of waste heat recovery.

[0009] Preferably, a side cover is movably installed on one side of the filter box, and a movable buckle strip is symmetrically mounted on the outer side of the side cover. Sliding blocks are provided at both ends of the movable buckle strip, which are arranged on the side of the filter box through the side cover, and cooperate with the movable buckle strip and the sliding block to realize the function of sliding buckling, which is convenient for quickly fastening and disassembling the side cover. When the side cover is removed, it is convenient to deal with the dirt remaining inside the filter box to avoid blockage.

[0010] Preferably, positioning pieces are fixedly installed at both ends of one side of the filter box, and the sliding blocks are movably connected to the inner sides of the positioning pieces. The positioning pieces provide sliding and supporting space for the sliding blocks, thereby ensuring complete and stable sliding adjustment, which helps to achieve a stable buckling effect.

[0011] Preferably, a tension spring is connected between the two sliding blocks, and a guide rod is provided on the inner side of the sliding block. Both ends of the guide rod are fixedly connected to the outer side of the positioning member through a fixing plate. The tension spring provides tension so that the two sliding blocks always drive the movable buckle strips to be buckled on the side cover plate, thereby ensuring the stability. When separating, the sliding block only needs to be manually pushed outward to separate, so that the tension spring extends, thereby facilitating the quick removal of the side cover plate.

[0012] Preferably, a water inlet pipe is fixedly connected to the top of the water storage tank, and the water inlet pipe runs through the top of the outer shell. A drain pipe is fixedly connected to the bottom of the water storage tank, and the drain pipe runs through the bottom of the outer shell. The water inlet pipe provides a water inlet function, and the drain pipe provides an exhaust function, thereby facilitating the functions of adding water and draining water to the water storage tank.

[0013] Preferably, a plurality of mounting holes are evenly opened through the top of the filter box, and the filter element plate is movably inserted through the inner side of the mounting holes. The through holes provided by the mounting holes facilitate the provision of installation space for the filter element plate.

[0014] Preferably, a plurality of sealing rings are evenly distributed on the top of the filter box, and the top of the sealing ring is sealed with the bottom of the sealing cover. The sealing ring cooperates with the sealing cover to further improve the sealing performance and ensure the sealing effect.

[0015] Preferably, a sliding groove is formed through the side surface of the positioning member, and the sliding block is movably connected to the inner side of the sliding groove. The sliding groove provides a sliding space, which facilitates the stable sliding adjustment of the sliding block on the positioning member.

[0016] Preferably, an outer side of the outer shell is fixedly connected to an outer support ring, a plurality of support legs are fixedly installed on the bottom of the outer support ring, a controller is fixedly installed on the outer wall of the outer shell, the outer support ring cooperates with the support legs to provide stable support for the outer shell, and the controller provides convenient control.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the gas thermal equipment is connected to the air inlet to collect the flue gas into the interior of the filter box, and the flue gas is filtered through the filter element plate in cooperation with the filter hole to reduce dirt. The sealing cover is sealed at the top in cooperation with the sealing ring to prevent flue gas leakage. Connecting ports are provided at both ends of the sealing cover to be buckled and connected with the docking grooves on the filter box to achieve the function of rapid assembly and disassembly, which is beneficial to improve the cleaning and replacement efficiency of the filter element plate to ensure high-efficiency filtering, thereby improving the waste heat recovery performance. The filtered flue gas is transported to the hot gas inlet through the connecting pipe, and then input into the hot gas circulation pipe for waste heat recovery.

[0019] 2. In the present invention, the side cover is arranged on the side of the filter box, and cooperates with the movable buckle strip and the sliding block to realize the sliding buckling function, which is convenient for quickly fastening and disassembling the side cover. When the side cover is removed, it is convenient to deal with the dirt remaining inside the filter box to avoid blockage. The positioning piece provides the sliding block with sliding and supporting space, thereby ensuring complete and stable sliding adjustment, which helps to achieve a stable buckling effect. The tension spring provides tension, so that the two sliding blocks always drive the movable buckle strip to be buckled on the side cover, thereby ensuring stability. When separating, it is only necessary to manually push the sliding block outward to separate it, so that the tension spring extends, which makes it convenient to quickly remove the side cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a flue gas waste heat recovery device for a gas-fired thermal power device according to the present invention;

[0021] Figure 2 It is a schematic structural diagram of another angle of a flue gas waste heat recovery device of a gas thermal power equipment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal cross-sectional structure of a flue gas waste heat recovery device for a gas-fired thermal power equipment according to the present invention;

[0023] Figure 4 It is a schematic diagram of the internal partial cross-sectional structure of a flue gas waste heat recovery device of a gas thermal power equipment of the present invention;

[0024] Figure 5 This is a schematic diagram of the decomposed structure of a filter mechanism of a flue gas waste heat recovery device for a gas-fired thermal power equipment according to the present invention;

[0025] Figure 6 For the present invention Figure 5 A in the figure is an enlarged structural diagram.

[0026] In the figure:

[0027] 1. Waste heat recovery mechanism; 101. Outer shell; 102. Outer support ring; 103. Support leg; 104. Controller; 105. Water storage tank; 106. Water inlet pipe; 107. Drain pipe; 108. Hot air inlet; 109. Hot air circulation pipe; 110. Exhaust port; 111. Insulation layer; 2. Filter mechanism; 201. Filter box; 202. Connecting pipe; 203. Filter element plate; 204. Filter hole; 205. Sealing cover; 206. Connecting port; 207. Docking groove; 208. Mounting hole; 209. Sealing ring; 210. Side cover; 211. Movable buckle strip; 212. Positioning piece; 213. Sliding groove; 214. Sliding block; 215. Guide rod; 216. Tension spring; 217. Air inlet; 3. Bottom plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not 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.

[0029] Example 1: Reference Figure 1-Figure 6 As shown: a waste heat recovery device for flue gas of a gas thermal power equipment, comprising a waste heat recovery mechanism 1, a bottom plate 3 is arranged at the bottom of the waste heat recovery mechanism 1, a filter mechanism 2 is arranged at one end of the top of the bottom plate 3, and the filter mechanism 2 is arranged on the side of the waste heat recovery mechanism 1, the waste heat recovery mechanism 1 comprises an outer shell 101, a water storage tank 105 is arranged inside the outer shell 101, a hot air circulation pipe 109 is installed around the outside of the water storage tank 105, a hot air inlet 108 is fixedly connected to the bottom end of the hot air circulation pipe 109, the hot air inlet 108 runs through the bottom of the outer shell 101, and the hot air circulation pipe 109 is fixedly connected to the bottom end of the hot air circulation pipe 109. The top of 109 is fixedly connected with an exhaust port 110, which runs through the top of the outer shell 101. The water storage tank 105 is arranged inside the outer shell 101 and is evenly wound by the hot air circulation pipe 109. The hot air circulation pipe 109 is connected to the upper air inlet through the hot air inlet 108 to collect the waste heat, and then distributes it to the outside of the water storage tank 105 through the hot air circulation pipe 109, providing an annular evenly distributed heat dissipation. The water source inside the water storage tank 105 is heated by the dissipated heat to realize the waste heat recovery and utilization function, and the exhaust port 110 can discharge the exhaust gas;

[0030] The filter mechanism 2 includes a filter box 201, one end of the filter box 201 is fixedly connected to an air inlet 217, the other end of the filter box 201 is fixedly connected to a connecting pipe 202, one end of the connecting pipe 202 is fixedly connected to the bottom of the hot air inlet 108, a plurality of filter plates 203 are evenly distributed inside the filter box 201, a plurality of filter holes 204 are evenly opened on the side of the filter plate 203, a sealing cover 205 is fixedly installed on the top of the filter plate 203, and connecting ports 206 are fixedly installed at both ends of the sealing cover 205, a plurality of docking grooves 207 are evenly distributed on both sides of the filter box 201, one end of the connecting port 206 is buckled and connected to the inside of the docking groove 207, and the air inlet 217 is outside. Connect to gas thermal equipment, collect flue gas into the interior of the filter box 201, filter the flue gas through the filter plate 203 and the filter hole 204 to reduce dirt, seal at the top through the sealing cover 205 and the sealing ring 209 to avoid flue gas leakage, and provide connection ports 206 at both ends of the sealing cover 205 to be snap-connected with the docking groove 207 on the filter box 201 to achieve the function of rapid assembly and disassembly, which is beneficial to improve the cleaning and replacement efficiency of the filter plate 203 to ensure high-efficiency filtering, thereby improving the waste heat recovery performance, and the filtered flue gas is transported to the hot gas inlet 108 through the connecting pipe 202, and then input into the hot gas circulation pipe 109 for waste heat recovery.

[0031] like Figure 3 and Figure 4 As shown, the inner wall of the outer shell 101 is fixedly installed with an insulation layer 111, and the insulation layer 111 is arranged on the outside of the hot air circulation pipe 109. The insulation layer 111 is wrapped around the outside of the water storage tank 105 and the hot air circulation pipe 109, which is beneficial to provide insulation during the waste heat recovery process, effectively improving the effect of heat accumulation, and thus improving the efficiency of waste heat recovery.

[0032] like Figure 6 As shown, a side cover plate 210 is movably installed on one side of the filter box 201, and a movable buckle strip 211 is symmetrically mounted on the outer side of the side cover plate 210. Sliding blocks 214 are provided at both ends of the movable buckle strip 211. The side cover plate 210 is arranged on the side of the filter box 201, and the movable buckle strip 211 and the sliding block 214 cooperate to realize the sliding buckling function, which is convenient for quickly fastening and disassembling the side cover plate 210. When the side cover plate 210 is disassembled, it is convenient to deal with the dirt remaining inside the filter box 201 to avoid blockage.

[0033] like Figure 6 As shown, positioning members 212 are fixedly installed at both ends of one side of the filter box 201, and the sliding blocks 214 are movably connected to the inner side of the positioning members 212. The positioning members 212 provide sliding and supporting space for the sliding blocks 214, thereby ensuring complete and stable sliding adjustment, which helps to achieve a stable buckling effect.

[0034] like Figure 6 As shown, a tension spring 216 is connected between the two sliding blocks 214, and a guide rod 215 is set through the inner side of the sliding block 214. The two ends of the guide rod 215 are fixedly connected to the outer side of the positioning member 212 through a fixing plate. The tension spring 216 provides a pulling force, so that the two sliding blocks 214 always drive the movable buckle strip 211 to be buckled on the side cover plate 210, thereby ensuring the stability. When separating, it is only necessary to manually push the sliding block 214 outward to separate it, so that the tension spring 216 extends, thereby facilitating the quick removal of the side cover plate 210.

[0035] like Figure 3 and Figure 4 As shown, the top of the water tank 105 is fixedly connected with a water inlet pipe 106, which runs through the top of the outer shell 101. The bottom of the water tank 105 is fixedly connected with a drain pipe 107, which runs through the bottom of the outer shell 101. The water inlet pipe 106 provides a water inlet function, and the drain pipe 107 provides an exhaust function, thereby facilitating the water tank 105 to provide water addition and drainage functions.

[0036] like Figure 5 As shown, a plurality of mounting holes 208 are evenly opened through the top of the filter box 201 , and the filter element plate 203 is movable through the inner side of the mounting holes 208 . The through holes provided by the mounting holes 208 facilitate the provision of installation space for the filter element plate 203 .

[0037] like Figure 5 As shown, a plurality of sealing rings 209 are evenly distributed on the top of the filter box 201, and the top of the sealing ring 209 is sealedly connected to the bottom of the sealing cover 205. The sealing ring 209 cooperates with the sealing cover 205 to further improve the sealing performance and ensure the sealing effect.

[0038] like Figure 6 As shown, a sliding groove 213 is formed through the side of the positioning member 212 , and a sliding block 214 is movably connected to the inner side of the sliding groove 213 . The sliding groove 213 provides a sliding space, which facilitates the sliding block 214 to slide and adjust stably on the positioning member 212 .

[0039] like Figure 2 As shown, an outer side of the outer shell 101 is fixedly connected with an outer support ring 102, a plurality of support legs 103 are fixedly installed at the bottom of the outer support ring 102, a controller 104 is fixedly installed on the outer wall of the outer shell 101, the outer support ring 102 cooperates with the support legs 103 to provide stable support for the outer shell 101, and the controller 104 provides convenient control.

[0040] In the present invention, when the flue gas waste heat recovery device of the gas thermal equipment is in use, first, the outer support ring 102 cooperates with the support leg 103 to provide a stable support for the outer shell 101, and the controller 104 provides a convenient control function. The air inlet 217 is connected to the gas thermal equipment, and the flue gas is collected into the interior of the filter box 201. The flue gas is filtered and processed through the filter plate 203 and the filter hole 204 to reduce dirt. The sealing cover 205 cooperates with the sealing ring 209 to seal at the top to avoid smoke leakage. The two ends of the sealing cover 205 are provided with connecting ports 206 that are buckled with the docking grooves 207 on the filter box 201. The assembly connection realizes the function of rapid assembly and disassembly, which is beneficial to improve the cleaning and replacement efficiency of the filter element plate 203, so as to ensure the high-efficiency filtering effect, thereby improving the waste heat recovery performance. The filtered flue gas is transported to the hot gas inlet 108 through the connecting pipe 202, and then input into the hot gas circulation pipe 109 for waste heat recovery. The water storage tank 105 is arranged inside the outer shell 101 and is wound through the hot gas circulation pipe 109. The hot gas circulation pipe 109 is connected to the upper air inlet through the hot gas inlet 108 to collect the waste heat, and then distributed on the outside of the water storage tank 105 through the hot gas circulation pipe 109, providing a ring The heat is evenly distributed, and the water source inside the water tank 105 is heated by the dissipated heat to realize the waste heat recovery function. The exhaust port 110 can discharge the exhaust gas. The insulation layer 111 is wrapped around the outside of the water tank 105 and the hot air circulation pipe 109, which is beneficial to provide insulation in the process of waste heat recovery, effectively improving the effect of heat accumulation, and thus improving the efficiency of waste heat recovery. The side cover 210 is arranged on the side of the filter box 201, and the movable buckle strip 211 and the sliding block 214 are used to realize the sliding buckle function, which is convenient for fastening and disassembling the side cover 210. Function: when the side cover 210 is removed, it is convenient to deal with the dirt remaining inside the filter box 201 to avoid clogging. The positioning piece 212 provides sliding and supporting space for the sliding block 214, thereby ensuring complete and stable sliding adjustment, which helps to achieve a stable buckling effect. The tension spring 216 provides tension so that the two sliding blocks 214 always drive the movable buckle strip 211 to be buckled on the side cover 210, thereby ensuring stability. When separating, you only need to manually push the sliding block 214 outward to separate it, so that the tension spring 216 extends, which makes it easy to quickly remove the side cover 210.

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas waste heat recovery device for a gas-fired thermal equipment, comprising a waste heat recovery mechanism (1), characterized in that: The waste heat recovery mechanism (1) is provided with a bottom plate (3) at the bottom, and a filter mechanism (2) is provided at one end of the top of the bottom plate (3), and the filter mechanism (2) is arranged on the side of the waste heat recovery mechanism (1); the waste heat recovery mechanism (1) comprises an outer shell (101), a water storage tank (105) is provided inside the outer shell (101), a hot air circulation pipe (109) is installed and wound around the outside of the water storage tank (105), a hot air inlet (108) is fixedly connected to the bottom end of the hot air circulation pipe (109), and the hot air inlet (108) passes through the bottom of the outer shell (101); the top end of the hot air circulation pipe (109) is fixedly connected to an exhaust port (110), and the exhaust port (110) passes through the top of the outer shell (101); The filtering mechanism (2) comprises a filter box (201), one end of the filter box (201) is fixedly connected to an air inlet (217), the other end of the filter box (201) is fixedly connected to a connecting pipe (202), one end of the connecting pipe (202) is fixedly connected to the bottom of a hot air inlet (108), a plurality of filter core plates (203) are evenly distributed inside the filter box (201), a plurality of filter holes (204) are evenly opened on the side of the filter core plate (203), a sealing cover (205) is fixedly installed on the top of the filter core plate (203), connecting ports (206) are fixedly installed at both ends of the sealing cover (205), a plurality of docking grooves (207) are evenly distributed on both sides of the filter box (201), and one end of the connecting port (206) is buckled and connected to the inside of the docking groove (207).

2. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: A heat-insulating layer (111) is fixedly mounted on the inner wall of the outer shell (101), and the heat-insulating layer (111) is arranged on the outside of the hot air circulation pipe (109).

3. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: A side cover plate (210) is movably mounted on one side of the filter box (201), and a movable buckle strip (211) is symmetrically mounted on the outer side of the side cover plate (210), and sliding blocks (214) are arranged at both ends of the movable buckle strip (211).

4. The flue gas waste heat recovery device for gas thermal equipment according to claim 3 is characterized in that: Positioning members (212) are fixedly mounted at both ends of one side of the filter box (201), and the sliding blocks (214) are movably connected to the inner side of the positioning members (212).

5. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 4 is characterized in that: A tension spring (216) is connected between the two sliding blocks (214), a guide rod (215) is provided through the inner side of the sliding block (214), and both ends of the guide rod (215) are fixedly connected to the outer side of the positioning member (212) through a fixing plate.

6. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: The top of the water storage tank (105) is fixedly connected to a water inlet pipe (106), and the water inlet pipe (106) passes through the top of the outer shell (101); the bottom of the water storage tank (105) is fixedly connected to a drainage pipe (107), and the drainage pipe (107) passes through the bottom of the outer shell (101).

7. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: A plurality of mounting holes (208) are evenly opened through the top of the filter box (201), and the filter element plate (203) is movably inserted through the inner side of the mounting holes (208).

8. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: A plurality of sealing rings (209) are evenly distributed on the top of the filter box (201), and the top of the sealing ring (209) is sealed and connected to the bottom of the sealing cover (205).

9. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 4, characterized in that: A sliding groove (213) is formed through the side surface of the positioning member (212), and the sliding block (214) is movably connected to the inner side of the sliding groove (213).

10. The flue gas waste heat recovery device for gas-fired thermal equipment according to claim 1, characterized in that: An outer support ring (102) is fixedly connected to the outer side of the outer shell (101), a plurality of support legs (103) are fixedly mounted on the bottom of the outer support ring (102), and a controller (104) is fixedly mounted on the outer wall of the outer shell (101).

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