Catalytic combustion furnace heat recovery device and method of use

Abstract

This invention relates to the field of heat energy recovery devices, and discloses a heat energy recovery device for a catalytic combustion furnace and its usage method. The device includes a fixing mechanism fixedly installed on the inner wall of a tank; a rotating mechanism fixedly installed on the outer wall of the fixing mechanism; and a baffle mechanism fixedly installed on the inner wall of the rotating mechanism. Gas flowing out from between the vent pipe and the second baffle plate is influenced by gas diffusing outward along the inner wall of the diffuser, causing the gas flowing out from between the second baffle plate and the vent pipe to be driven, making the gas flow against the inner wall of the tank. In this way, the gas can be evenly distributed to each heat exchange tube opening, ensuring that each tube receives exhaust gas with similar flow rate and composition. This prevents the airflow from entering the tube bundle and deviating from its intended state, which would result in the tubes with high flow rates being fully cooled while those with low flow rates overheat due to insufficient heat exchange, causing different expansion rates in each tube, leading to tube bundle bending and tube sheet deformation.

Description

Technical Field

[0001] This invention relates to the field of heat energy recovery equipment technology, specifically to a heat energy recovery device for a catalytic combustion furnace and its usage method. Background Technology

[0002] Catalytic combustion technology is one of the mainstream processes for treating volatile organic compounds (VOCs). Its core principle is to oxidize and decompose organic waste gas into carbon dioxide and water in the temperature range of 200-500℃ under the action of a catalyst.

[0003] During heat recovery, hot and cold gases are introduced into the heat exchange tubes. Because the gases have different velocities and directions before entering the pipes, they collide with the inside of the device, causing the gas to deflect. This results in different gas flow rates in each pipe, where the pipes with higher flow rates are fully cooled, while the pipes with lower flow rates overheat due to insufficient heat exchange. This causes different expansion rates in each pipe, leading to tube bundle bending and tube sheet deformation. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a catalytic combustion furnace heat recovery device, including a tank, two bases fixedly connected to the outer wall of the tank, two cold air inlets at one end of the tank, a hot air inlet at the side of the tank away from the cold air inlets, and an air outlet at the end of the tank away from the cold air inlets, and further comprising:

[0005] The fixing mechanism is fixedly installed on the inner wall of the tank.

[0006] A rotating mechanism is fixedly installed on the outer wall of the fixed mechanism.

[0007] A flow-blocking mechanism is fixedly installed on the inner wall of the rotating mechanism;

[0008] The cold air inlet and the hot air inlet are symmetrically positioned. Cold air enters through the cold air inlet, while hot air enters through the hot air inlet. The cold air enters the interior of the rotating mechanism, causing it to rotate.

[0009] Preferably, the fixing mechanism includes:

[0010] The fixing component is fixedly installed on the inner wall of the tank.

[0011] Positioning component, which is fixedly installed on the inner wall of the tank;

[0012] When cold air and hot air enter the tank through the cold air inlet and hot air inlet, the cold air is guided by the fixing component and the positioning component to make the rotating mechanism rotate.

[0013] Preferably, the rotating mechanism includes:

[0014] A rotating component is rotatably connected to the outer wall of the positioning component.

[0015] The air intake assembly is fixedly mounted on the outer wall of the rotating assembly.

[0016] As the gas is guided by the fixing and positioning components, it impacts the rotating mechanism, causing the rotating mechanism to start rotating.

[0017] Preferably, the flow-blocking mechanism includes:

[0018] A flow-blocking component is fixedly installed on the outer wall of the rotating component;

[0019] A reversing component is fixedly mounted on the outer wall of the positioning component.

[0020] The gas inside the rotating component is ejected from the baffle component, and the gas is in a diffused state.

[0021] Preferably, the fixing assembly includes a first inclined tube fixedly connected to the inner wall of the cold air inlet, and a second inclined tube fixedly connected to the inner wall of the cold air inlet.

[0022] The positioning assembly includes a positioning post fixedly connected to the inner wall of the end of the tank, a baffle plate one fixedly connected to the inner wall of the tank, and a baffle plate two fixedly connected to the inner wall of the tank.

[0023] The outlet of the inclined tube one is offset to the left of the positioning column, with the positioning column as the center. The outlet of the inclined tube two is opposite to that of the inclined tube one. The baffle plate one and the baffle plate two are distributed on both sides of the outlet of the inclined tube one, and both are inclined away from the positioning column.

[0024] Preferably, the rotating assembly includes a rotating cavity rotatably connected to the outer wall of the positioning column, and a plurality of vent pipes are fixedly connected to the outer wall of the rotating cavity;

[0025] The side of the rotating cavity furthest from the positioning post is not sealed.

[0026] Preferably, the air intake assembly includes a convergence tube fixedly connected to one end of a plurality of air ducts away from the rotating chamber, and a connecting block is fixedly connected between two convergence tubes;

[0027] The converging tube is funnel-shaped, and the connecting block has multiple slots.

[0028] Preferably, the flow-blocking assembly includes a diffuser shroud fixedly connected to the side of the rotating cavity away from the positioning post, and a plurality of inclined plates are fixedly connected to the inner wall of the diffuser shroud near the positioning post.

[0029] The diffuser has a diffused shape, with the inclined plate tilting towards the positioning post.

[0030] Preferably, the reversing component includes a reversing cone fixedly connected to the outer wall of the positioning post, and a guide block is fixedly connected to the outer wall of the positioning post;

[0031] The front half of the deflecting cone expands away from the positioning post, while the rear half of the deflecting cone converges towards the positioning post.

[0032] A method for using a catalytic combustion furnace heat recovery device includes the following steps:

[0033] S1: Connecting pipes: Connect the external pipes to the cold air inlet, hot air inlet, and air outlet;

[0034] S2: Gas introduction: Cold air and hot air are introduced into the cold air inlet (13) and the hot air inlet respectively;

[0035] S3: Start working: The gases from inclined tube one and inclined tube two will mix with each other inside the rotating chamber and be ejected along the inner wall of the diffuser.

[0036] The present invention has the following beneficial effects:

[0037] (1) By setting up a vent pipe, when the gas enters the rotating chamber, the rotation of the rotating chamber will cause some of the gas to diffuse outward along the outer wall of the diffuser, while some of the gas will come into contact with the outer wall of the inclined plate, causing the gas to flow towards the center of the deflection cone. At the same time, the gas flowing out from between the vent pipe and the second baffle plate will be affected by the gas that diffuses outward along the inner wall of the diffuser, causing the gas flowing out from between the second baffle plate and the vent pipe to be driven, so that the gas flowing out from between the second baffle plate and the vent pipe flows against the inner wall of the tank. In this way, the gas can be evenly distributed to each heat exchange tube opening, so that each pipe can obtain exhaust gas with similar flow rate and composition, preventing the airflow from entering the tube bundle and deviating from its state, which would result in the large flow rate being fully cooled, while the small flow rate tubes would overheat due to insufficient heat exchange, causing different expansion of each tube, causing the tube bundle to bend and the tube sheet to deform.

[0038] (2) By setting up a diffusion hood, the gas rotating through the rotating cavity will start to diffuse outward along the edge of the diffusion hood. At this time, some of the gas will come into contact with the inclined plate, which will cause some of the gas to change its flow direction and move along the outer wall of the inclined plate towards the direction of the deflection cone. This will cause some of the gas to diffuse outward, while the other part of the gas will move towards the direction of the deflection cone. In this way, a large number of tiny vortices will be generated at the junction of the gas flowing away from the deflection cone and the gas flowing near the deflection cone. These vortices tear the hot and cold gas masses into tiny fragments, which greatly increases the contact area between the hot and cold gases and improves the heat exchange efficiency.

[0039] (3) By setting up a rotating cavity, the gas will be preheated by the heat at the end of the pipe when it enters the rotating cavity. If there is temperature stratification in the upper part of the pipe, the stratified gas will be dispersed by the rotation of the rotating cavity. In this way, the gas with uniform temperature enters the heat exchange pipe, avoiding the severe thermal stress caused by local overcooled or overheated gas and reducing the risk of thermal fatigue cracks.

[0040] (4) By setting an inclined plate, the gas can be preheated by rotating through the rotating cavity. Then, by passing through the diffuser, the gas is evenly distributed on the inner wall of each heat exchange tube. This means that the subsequent heat exchange pipe does not need to be too long. Compared with heat exchangers with longer pipes, the gas heat transfer coefficient is very low because the inlet section is in a laminar or transitional flow state. In order to achieve heat exchange, the user will increase the pipe length or pipe diameter, which will cause the fluid to undergo induced vibration in the long pipe, resulting in fatigue fracture at the pipe connection. After the pipe length is shortened, the natural frequency of the tube bundle is increased, and the vibration resistance is enhanced. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0044] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0045] Figure 4 This is a schematic diagram of the overall structure of the reversing cone head of the present invention;

[0046] Figure 5 This is a schematic diagram of the overall structure of the diffusion shroud of the present invention;

[0047] Figure 6 This is a schematic cross-sectional view of the overall structure of the rotating cavity of the present invention;

[0048] Figure 7 This is a planar schematic diagram of the gas flow direction according to the present invention;

[0049] Figure 8 For the present invention Figure 7 Enlarged diagram at point B

[0050] Figure 9 This is a schematic diagram of the overall structure of the connecting block of the present invention;

[0051] Figure 10 This is a schematic diagram of the workflow of the present invention.

[0052] The attached diagram lists the components represented by each number as follows:

[0053] In the diagram: 12. Tank body; 13. Cold air inlet; 14. Hot air inlet; 15. Base; 16. Air outlet; 2. Fixing mechanism; 21. Fixing component; 211. Inclined tube one; 212. Inclined tube two; 22. Positioning component; 221. Positioning post; 222. Baffle one; 223. Baffle two; 3. Rotating mechanism; 31. Rotating component; 311. Rotating chamber; 312. Vent pipe; 32. Air inlet component; 321. Converging pipe; 322. Connecting block; 4. Baffle mechanism; 41. Baffle component; 411. Diffuser; 412. Directional cone; 42. Directional component; 421. Inclined plate; 422. Guide block. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Example 1, please refer to Figure 1 - Figure 8 This invention relates to a heat recovery device for a catalytic combustion furnace, comprising a tank 12, with two bases 15 fixedly connected to the outer wall of the tank 12. Two cold air inlets 13 are provided at one end of the tank 12, a hot air inlet 14 is provided on the side of the tank 12 away from the cold air inlets 13, and an air outlet 16 is provided at the end of the tank 12 away from the cold air inlets 13. The device also includes:

[0056] Fixing mechanism 2 is fixedly installed on the inner wall of tank body 12;

[0057] Rotating mechanism 3 is fixedly installed on the outer wall of fixed mechanism 2;

[0058] The flow-blocking mechanism 4 is fixedly installed on the inner wall of the rotating mechanism 3;

[0059] The cold air inlet 13 and the hot air inlet 14 are symmetrically positioned. Cold air enters from the cold air inlet 13, while hot air enters from the hot air inlet 14. Both enter the interior of the rotating mechanism 3, causing the rotating mechanism 3 to rotate.

[0060] Fixed mechanism 2 includes:

[0061] Fixing component 21 is fixedly installed on the inner wall of tank body 12;

[0062] Positioning component 22 is fixedly installed on the inner wall of tank body 12;

[0063] When cold air and hot air enter the tank 12 from the cold air inlet 13 and the hot air inlet 14, the rotating mechanism 3 will rotate under the guidance of the fixing component 21 and the positioning component 22.

[0064] Example 2, please refer to Figure 2 - Figure 10 This invention relates to a heat recovery device for a catalytic combustion furnace. Based on Embodiment 1, the rotating mechanism 3 includes:

[0065] Rotating component 31 is rotatably connected to the outer wall of positioning component 22;

[0066] The air intake assembly 32 is fixedly mounted on the outer wall of the rotating assembly 31;

[0067] When the gas is guided by the fixing component 21 and the positioning component 22, the gas will hit the rotating mechanism 3, causing the rotating mechanism 3 to start rotating.

[0068] The flow-blocking mechanism 4 includes:

[0069] A flow-blocking component 41 is fixedly disposed on the outer wall of the rotating component 31.

[0070] The reversing component 42 is fixedly disposed on the outer wall of the positioning component 22;

[0071] The gas inside the rotating component 31 will be ejected from the baffle component 41, and the gas will be in a diffused state.

[0072] The fixing component 21 includes a first inclined tube 211 fixedly connected to the inner wall of the cold air inlet 13, and a second inclined tube 212 fixedly connected to the inner wall of the cold air inlet 13.

[0073] The positioning component 22 includes a positioning post 221 fixedly connected to the inner wall of the end of the tank 12, a baffle plate 222 fixedly connected to the inner wall of the tank 12, and a baffle plate 223 fixedly connected to the inner wall of the tank 12.

[0074] The outlet of the inclined tube 211 is tilted to the left of the positioning post 221, with the positioning post 221 as the center. The outlet of the inclined tube 212 is opposite to that of the inclined tube 211. The baffle 222 and the baffle 223 are distributed on both sides of the outlet of the inclined tube 211, and both are tilted away from the positioning post 221.

[0075] The rotating assembly 31 includes a rotating cavity 311 rotatably connected to the outer wall of the positioning post 221, and a plurality of vent pipes 312 are fixedly connected to the outer wall of the rotating cavity 311.

[0076] The rotating cavity 311 is not closed on the side away from the positioning post 221.

[0077] The air intake assembly 32 includes a convergence tube 321 fixedly connected to one end of a plurality of air vents 312 away from the rotating cavity 311, and a connecting block 322 fixedly connected between two convergence tubes 321.

[0078] The gathering tube 321 is funnel-shaped, and the connecting block 322 has multiple slots.

[0079] The flow-blocking assembly 41 includes a diffuser 411 fixedly connected to the side of the rotating cavity 311 away from the positioning post 221, and a number of inclined plates 412 are fixedly connected to the inner wall of the diffuser 411 near the positioning post 221.

[0080] The diffuser shroud 411 has a diffused shape, and the inclined plate 412 is tilted towards the positioning post 221.

[0081] The reversing assembly 42 includes a reversing cone 421 fixedly connected to the outer wall of the positioning post 221, and a guide block 422 fixedly connected to the outer wall of the positioning post 221;

[0082] The front half of the deflecting cone 421 expands away from the positioning post 221, while the rear half of the deflecting cone 421 converges towards the positioning post 221.

[0083] A method for using a catalytic combustion furnace heat recovery device includes the following steps:

[0084] S1: Connecting pipes: Connect the external pipes to the cold air inlet 13, the hot air inlet 14, and the air outlet 16;

[0085] S2: Gas introduction: Cold air and hot air are introduced into cold air inlet 13 and hot air inlet 14 respectively;

[0086] S3: Start working: The gas in inclined tube 1 211 and inclined tube 2 212 will mix with each other inside the rotating cavity 311 and be ejected along the inner wall of the diffuser 411.

[0087] A specific application of this embodiment is as follows: At the start of operation, the external pipe is first connected to the inside of the cold air inlet 13, while hot air enters from the hot air inlet 14. A heat exchange tube separates the hot and cold air, preventing direct contact between them. Residual hot air from the combustion furnace enters the tank 12 through the external pipe from the hot air inlet 14, and cold air enters the tank 12 through the external pipe from the cold air inlet 13. When the gas entering the inclined tubes 211 and 212 flows out and contacts the baffle plate 222, the gas at the edges of the inclined tubes 211 and 212, guided by the baffle plate 222, flows towards the rotating cavity 311. The gas at the center of the inclined tubes 211 and 212 blows towards the left and right sides of the rotating cavity 311, causing it to begin rotating. Simultaneously, some gas... The gas enters the converging tube 321, while the gas enters the rotating cavity 311 through the venting tube 312. The gas entering the rotating cavity 311 comes into contact with the guide block 422, and then moves towards the diffuser 411. During the gas movement, guided by the diffuser 411 and the deflecting cone 421, the gas moves away from the deflecting cone 421, resulting in a radial flow pattern. As the gas flows along the inner wall of the diffuser 411, it comes into contact with the inclined plate 412, causing some of the gas to move towards the inclined plate 412. Before the gas enters the converging tube 321, some gas flows between the baffle plate 223 and the venting tube 312. Guided by the baffle plate 223, the gas moves towards the inclined plate 412, causing the two gases to collide and mix.

[0088] By setting up a rotating cavity 311, the gas entering the rotating cavity 311 will be preheated by the heat at the end of the pipe. If there is temperature stratification in the upper part of the pipe, the rotation of the rotating cavity 311 will disperse the stratified gas. In this way, the gas with uniform temperature enters the heat exchange pipe, avoiding the severe thermal stress caused by locally overcooled or overheated gas and reducing the risk of thermal fatigue cracks.

[0089] By setting up a diffuser 411, the gas rotating through the rotating cavity 311 will begin to diffuse outward along the edge of the diffuser 411. At this time, some of the gas will come into contact with the inclined plate 412, which will cause some of the gas to change its flow direction and move along the outer wall of the inclined plate 412 towards the direction-changing cone 421. This will cause some of the gas to diffuse outward, while the other part of the gas will move towards the direction-changing cone 421. In this way, a large number of tiny vortices will be generated at the interface between the gas flowing at an angle away from the direction-changing cone 421 and the gas flowing at an angle close to the direction-changing cone 421. These vortices tear the hot and cold gas masses into tiny fragments, greatly increasing the contact area between the hot and cold gases and improving the heat exchange efficiency.

[0090] By setting up the vent pipe 312, when the gas enters the rotating chamber 311, the rotation of the rotating chamber 311 will cause some of the gas to diffuse outward along the outer wall of the diffuser 411, while some of the gas will come into contact with the outer wall of the inclined plate 412, causing the gas to flow closer to the center of the deflecting cone 421. At the same time, the gas flowing out from between the vent pipe 312 and the baffle plate 223 will be affected by the gas diffused outward along the inner wall of the diffuser 411, causing the gas flowing out from between the baffle plate 223 and the vent pipe 312 to be driven, so that the gas flowing out from between the baffle plate 223 and the vent pipe 312 flows against the inner wall of the tank 12. In this way, the gas can be evenly distributed to each heat exchange tube opening, so that each tube can obtain exhaust gas with similar flow rate and composition, preventing the airflow from entering the tube bundle in a deviated state, which would result in the tubes with large flow rates being fully cooled, while the tubes with small flow rates overheating due to insufficient heat exchange, causing different expansion of each tube, causing the tube bundle to bend and the tube sheet to deform.

[0091] By setting the inclined plate 412, the gas rotates through the rotating cavity 311, allowing the cold and hot air to be preheated initially. Then, through the diffuser 411, the gas is evenly distributed on the inner wall of each heat exchange tube. This means that the subsequent heat exchange pipes do not need to be too long. Compared with heat exchangers with longer pipes, the heat transfer coefficient of the gas is very low because the inlet section is in a laminar or transitional flow state. In order to achieve heat exchange, users will increase the pipe length or pipe diameter, which will cause the fluid to undergo induced vibration in the long pipe, resulting in fatigue fracture at the pipe connection. After shortening the pipe length, the natural frequency of the tube bundle increases, and the vibration resistance is enhanced.

[0092] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A heat recovery device for a catalytic combustion furnace, comprising a tank (12), wherein two bases (15) are fixedly connected to the outer wall of the tank (12), two cold air inlets (13) are provided at one end of the tank (12), a hot air inlet (14) is provided on the side of the tank (12) away from the cold air inlets (13), and an air outlet (16) is provided at the end of the tank (12) away from the cold air inlets (13), characterized in that, Also includes: Fixing mechanism (2), which is fixedly installed on the inner wall of the tank (12); Rotating mechanism (3), which is fixedly installed on the outer wall of fixed mechanism (2); A flow-blocking mechanism (4) is fixedly installed on the inner wall of the rotating mechanism (3); The cold air inlet (13) and the hot air inlet (14) are centrally symmetrical. Cold air enters from the cold air inlet (13), while hot air enters from the hot air inlet (14). The cold air enters the interior of the rotating mechanism (3), causing the rotating mechanism (3) to rotate.

2. The catalytic combustion furnace heat recovery device according to claim 1, characterized in that: The fixing mechanism (2) includes: A fixing component (21) is fixedly disposed on the inner wall of the tank body (12); Positioning component (22), which is fixedly disposed on the inner wall of the tank body (12); In this process, cold air and hot air enter the tank (12) through the cold air inlet (13) and the hot air inlet (14). The cold air is guided by the fixing component (21) and the positioning component (22) to make the rotating mechanism (3) rotate.

3. The catalytic combustion furnace heat recovery device according to claim 2, characterized in that: The rotating mechanism (3) includes: A rotating assembly (31) is rotatably connected to the outer wall of the positioning assembly (22); An air intake assembly (32) is fixedly disposed on the outer wall of the rotating assembly (31); When the gas is guided by the fixing component (21) and the positioning component (22), the gas will hit the rotating mechanism (3), causing the rotating mechanism (3) to start rotating.

4. The catalytic combustion furnace heat recovery device according to claim 3, characterized in that: The flow-blocking mechanism (4) includes: A flow-blocking assembly (41) is fixedly disposed on the outer wall of the rotating assembly (31); A reversing component (42) is fixedly disposed on the outer wall of the positioning component (22); The gas inside the rotating component (31) will be ejected from the baffle component (41), and the gas will be in a diffused state.

5. The catalytic combustion furnace heat recovery device according to claim 4, characterized in that: The fixing component (21) includes a first inclined tube (211) fixedly connected to the inner wall of the cold air inlet (13), and a second inclined tube (212) fixedly connected to the inner wall of the cold air inlet (13). The positioning component (22) includes a positioning post (221) fixedly connected to the inner wall of the end of the tank (12), a baffle plate (222) fixedly connected to the inner wall of the tank (12), and a baffle plate (223) fixedly connected to the inner wall of the tank (12). The outlet of the inclined tube 1 (211) is skewed to the left of the positioning post (221) with the positioning post (221) as the center. The outlet of the inclined tube 2 (212) is opposite to that of the inclined tube 1 (211). The baffle 1 (222) and the baffle 2 (223) are distributed on both sides of the outlet of the inclined tube 1 (211) and are both inclined away from the positioning post (221).

6. The catalytic combustion furnace heat recovery device according to claim 5, characterized in that: The rotating assembly (31) includes a rotating cavity (311) rotatably connected to the outer wall of the positioning column (221), and a plurality of vent pipes (312) are fixedly connected to the outer wall of the rotating cavity (311). The rotating cavity (311) is not closed on the side away from the positioning post (221).

7. The catalytic combustion furnace heat recovery device according to claim 6, characterized in that: The air intake assembly (32) includes a coiling tube (321) fixedly connected to one end of a plurality of air vents (312) away from the rotating cavity (311), and a connecting block (322) is fixedly connected between two coiling tubes (321). The gathering tube (321) is funnel-shaped, and the connecting block (322) has multiple slots.

8. The catalytic combustion furnace heat recovery device according to claim 6, characterized in that: The flow-blocking assembly (41) includes a diffuser (411) fixedly connected to the side of the rotating cavity (311) away from the positioning post (221), and a number of inclined plates (412) are fixedly connected to the inner wall of the diffuser (411) near the positioning post (221). The diffuser (411) has a diffused shape, and the inclined plate (412) is tilted towards the positioning post (221).

9. The catalytic combustion furnace heat recovery device according to claim 7, characterized in that: The reversing assembly (42) includes a reversing cone (421) fixedly connected to the outer wall of the positioning post (221), and a guide block (422) is fixedly connected to the outer wall of the positioning post (221). The front half of the deflecting cone (421) expands away from the positioning post (221), while the rear half of the deflecting cone (421) converges towards the positioning post (221).

10. A method of using a catalytic combustion furnace heat recovery device, employing the catalytic combustion furnace heat recovery device as described in claim 9, characterized in that: Includes the following steps, S1: Connecting pipes: Connect the external pipes to the cold air inlet (13), the hot air inlet (14), and the air outlet (16). S2: Gas introduction: Cold air and hot air are introduced into the cold air inlet (13) and hot air inlet (14) respectively; S3: Start working: The gas from inclined tube one (211) and inclined tube two (212) will mix with each other inside the rotating cavity (311) and be ejected along the inner wall of the diffuser (411).

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