A boiler exhaust gas waste heat recovery device

Abstract

The present application relates to the technical field of boiler exhaust gas, and particularly discloses a boiler exhaust gas waste heat recovery device, which comprises a boiler flue, a mounting plate arranged on the right side of the boiler flue, a cover plate arranged on the upper side of the mounting plate, a filter screen fixedly arranged on the lower side of the right end of the cover plate, a moving structure comprising a limiting block, a mounting block and a fixing rod, a water tank arranged on the right side of the mounting plate, and a water inlet pipe arranged on the right side of the upper end of the water tank, wherein the upper end of the water inlet pipe is connected with a limiting structure, and the limiting structure comprises a fixing block, a second spring and a connecting rod. The boiler exhaust gas waste heat recovery device is provided with the moving structure, which can limit the filter screen, thereby filtering the impurities in the exhaust gas. The limiting structure is arranged to install the filter frame, thereby avoiding the formation of scale in the heating process of the impurities in the water flow, and reducing the heat transfer efficiency.

Description

Technical Field

[0001] This invention relates to the field of boiler exhaust gas technology, specifically to a boiler exhaust gas waste heat recovery device. Background Technology

[0002] Waste heat recovery devices refer to equipment that recovers and utilizes waste heat, converting the waste heat in industrial emissions such as flue gas and wastewater into electrical, thermal, or mechanical energy. Boiler exhaust gas is a mixture of pollutants produced when fuels (such as coal, natural gas, and biomass) are burned in boilers. It mainly contains particulate matter, sulfur dioxide, nitrogen oxides, carbon monoxide, and small amounts of heavy metals. Its composition and concentration vary depending on the type of fuel. For example, coal-fired boilers mainly contain sulfur dioxide and particulate matter, while gas-fired boilers mainly contain nitrogen oxides. These pollutants are important sources of acid rain, smog, and the greenhouse effect, and must be treated to meet emission standards. Waste heat recovery devices are needed to recover and utilize the waste heat from boiler exhaust gas in boiler exhaust gas treatment.

[0003] The existing technical solutions have the following drawbacks: When the waste heat recovery device performs gas-liquid heat exchange, water is poured into the heat exchanger to exchange heat with the waste gas. Because water is poured into the heat exchanger for heat exchange, scale will form during the heating process, affecting the heat transfer effect. Furthermore, when the boiler waste heat recovery device recovers and utilizes the heat in the boiler waste gas to heat the water, it will reduce the waste heat recovery effect of the boiler waste gas. Therefore, we propose a boiler waste heat recovery device to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a boiler exhaust gas waste heat recovery device to solve the problems mentioned in the background art. When the waste heat recovery device performs gas-liquid heat exchange, water is poured into the heat exchanger to exchange heat with the exhaust gas. However, this process causes scale to form during heating, which affects the heat transfer effect. Furthermore, when the boiler exhaust gas waste heat recovery device recovers and utilizes the heat from the exhaust gas to heat the water, it reduces the waste heat recovery effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: As a preferred technical solution of the present invention, a boiler exhaust gas waste heat recovery device includes a boiler flue, and an installation plate is provided on its right side;

[0006] Also includes:

[0007] A cover plate is provided on the upper side of the mounting plate. A filter screen is fixedly installed on the lower right side of the cover plate, and a movable structure is provided on the left side of the cover plate. The movable structure includes a limiting block, a mounting block and a fixing rod. The limiting block is installed on the lower left side of the cover plate, and a mounting block is installed on the upper left side of the cover plate. A fixing rod is connected to the left side of the mounting block.

[0008] A water tank is located on the right side of the mounting plate, and an inlet pipe is installed on the upper right side of the water tank. A connecting plate is connected to the upper side of the inlet pipe, and a filter frame is provided on the lower side of the connecting plate. A limiting structure is connected to the outer side of the upper end of the inlet pipe, and the limiting structure includes a fixing block, a second spring, and a connecting rod. The fixing block is installed on the outer side of the upper end of the inlet pipe, and a second spring is provided on the outer side of the fixing block. A connecting rod is connected through the middle of the second spring.

[0009] Preferably, a sealing ring is fixedly provided on the inner left side of the mounting plate, and a movable rod is provided on the inner right side of the mounting plate. A connecting movable plate is fixedly installed on the upper side of the movable rod, and a first spring is provided on the upper left side of the connecting movable plate, with a moving rod passing through the middle of the first spring.

[0010] Preferably, a flue gas inlet pipe is fixedly installed on the middle side of the right end of the mounting plate, and a heat exchange cylinder is fixedly installed on the right end of the flue gas inlet pipe. An installation connecting cylinder is fixedly installed on the outer side of the middle part of the flue gas inlet pipe, and a fresh gas inlet pipe is provided on the front side of the right end of the installation connecting cylinder, and a hot gas outlet pipe is provided on the rear side of the left end of the installation connecting cylinder.

[0011] Preferably, a flue gas outlet pipe is fixedly installed on the right side of the heat exchange cylinder, and a heat exchange connecting pipe is fixedly installed on the right side of the flue gas outlet pipe. The outer side of the heat exchange connecting pipe is fixedly connected to the inner side of the water tank, and a water outlet pipe is installed on the lower left side of the water tank.

[0012] Preferably, an inner cavity is formed between the mounting connecting cylinder and the heat exchange cylinder to allow the air to be heated to flow.

[0013] Preferably, the mounting block and the mounting plate are connected by a snap-fit ​​connection, and the vertical cross-sectional shape of the mounting block is an "L" shape.

[0014] Preferably, the connecting movable plate and the moving rod are telescopically slidingly connected, and the moving rod and the cover plate are interlockingly connected.

[0015] Preferably, the water inlet pipe and the connecting plate are fitted together, and the connecting plate and the connecting rod are snap-fitted together, and the connecting rods are symmetrically distributed about the center line of the water inlet pipe.

[0016] Preferably, a baffle plate is provided on the outer side of the middle part of the water inlet pipe, and a limit rod is movably connected to the outer side of the lower end of the baffle plate.

[0017] Preferably, the blocking plate and the limiting rod are connected by threads, and the blocking plate and the connecting rod are connected by a fitted connection.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: the boiler exhaust heat recovery device is provided with a movable structure that can limit the filter screen, thereby filtering impurities in the exhaust gas. In addition, the limiting structure can install the filter frame, thereby preventing impurities in the water flow from forming scale during the heating process and reducing heat transfer efficiency.

[0019] 1. By placing the cover plate on the upper side of the mounting plate, the cover plate moves the filter screen on the upper side of the mounting plate, thereby causing the cover plate to move the filter screen and the limiting block downward inside the mounting plate. This causes the limiting block to slide downward above the sealing ring, and the cover plate to move the mounting block downward, thus allowing the filter screen to fit and connect inside the mounting plate. This allows the cover plate to move the limiting block to engage with the upper side of the boiler flue, and the cover plate to engage with the mounting block at the middle left end of the mounting plate. Rotating the fixing rod causes it to be threaded on the lower left end of the mounting block, thus making the fixing rod threaded on the left side of the mounting plate. This facilitates the assembly and positioning of the mounting connecting cylinder and the boiler flue, facilitates the installation of the filter screen, and filters the exhaust gas.

[0020] 2. By placing the connecting plate on the upper side of the water inlet pipe, the connecting plate drives the filter frame to engage inside the water inlet pipe. Loosen the connecting rod, and the second spring drives the connecting rod to slide inward, so that the connecting rod slides inward in the middle of the fixing block, and then engages on the outside of the water inlet pipe. Place the baffle plate on the outer side of the middle of the water inlet pipe, so that the baffle plate fits against the outer side of the connecting rod. Rotate the limiting rod, so that the limiting rod is threaded on the outer side of the lower end of the baffle plate, so that the limiting rod is threaded on the outer side of the middle of the water inlet pipe, which facilitates the limiting of the filter frame and thus facilitates the filtration of water flow.

[0021] 3. The waste gas from the boiler enters the mounting plate through the boiler flue. The filter screen inside the mounting plate filters impurities from the waste gas. The filtered waste gas then enters the heat exchange cylinder through the flue gas inlet pipe. Simultaneously, the air to be heated enters the fresh air inlet pipe through an external exhaust fan. This fresh air then enters the mounting connection cylinder, where the temperature of the waste gas is transferred to the heat exchange cylinder, heating the air inside to a certain temperature before being discharged through the hot gas outlet pipe. The waste gas then enters the flue gas outlet pipe, and subsequently the heat exchange connection pipe. Simultaneously, water flows into the water tank through the water inlet pipe. The temperature of the waste gas is transferred to the heat exchange connection pipe, heating the water. This opens the valve inside the water outlet pipe, allowing the heated water to be discharged. This process utilizes the waste heat from the boiler waste gas to heat both the gas and liquid, thereby improving the waste heat recovery effect of the boiler waste gas. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a schematic cross-sectional view of the connection between the boiler flue and the mounting plate of the present invention.

[0024] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 3 This is a schematic cross-sectional view of the connection between the heat exchange cylinder and the mounting connecting cylinder of the present invention.

[0026] Figure 4 This is a schematic cross-sectional view of the connection between the heat exchange connecting pipe and the water tank in this invention.

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0028] Figure 6 This is a schematic cross-sectional view of the connection between the water tank and the outlet pipe of the present invention.

[0029] Figure 7 This is a schematic diagram of the overall structure of the connection between the hot gas outlet pipe and the mounting connecting cylinder of the present invention;

[0030] Figure 8 This is a schematic diagram of the overall structure connecting the flue gas outlet pipe and the heat exchange connection pipe of the present invention.

[0031] In the diagram: 1. Boiler flue; 2. Mounting plate; 3. Filter screen; 4. Flue gas inlet pipe; 5. Heat exchanger cylinder; 6. Mounting connecting cylinder; 7. Flue gas outlet pipe; 8. Hot gas outlet pipe; 9. Heat exchange connecting pipe; 10. Water tank; 11. Water outlet pipe; 12. Connecting plate; 13. Cover plate; 14. Limiting block; 15. Sealing ring; 16. Mounting block; 17. Fixed rod; 18. Movable rod; 19. Connecting movable plate; 20. First spring; 21. Moving rod; 22. Fresh air inlet pipe; 23. Water inlet pipe; 24. Fixed block; 25. Second spring; 26. Connecting rod; 27. Filter frame; 28. Baffle plate; 29. ​​Limiting rod. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Please see Figures 1-8 The present invention provides the following technical solution:

[0034] A boiler exhaust heat recovery device includes: a boiler flue 1, a mounting plate 2, a filter screen 3, a flue gas inlet pipe 4, a heat exchange cylinder 5, a mounting connecting cylinder 6, a flue gas outlet pipe 7, a hot gas outlet pipe 8, a heat exchange connecting pipe 9, a water tank 10, a water outlet pipe 11, a connecting plate 12, a cover plate 13, a limiting block 14, a sealing ring 15, a mounting block 16, a fixed rod 17, a movable rod 18, a connecting movable plate 19, a first spring 20, a moving rod 21, a fresh gas inlet pipe 22, a water inlet pipe 23, a fixed block 24, a second spring 25, a connecting rod 26, a filter frame 27, a baffle plate 28, and a limiting rod 29.

[0035] When using it for work, specifically such as Figure 1 , Figure 2 and Figure 3As shown, a sealing ring 15 is provided on the outer side of the right end of the boiler flue 1. A mounting plate 2 is fixedly connected to the outer side of the sealing ring 15. A cover plate 13 is provided on the middle side of the upper end of the mounting plate 2. A filter screen 3 is provided on the lower side of the cover plate 13. A limiting block 14 is fixedly installed on the lower side of the left end of the cover plate 13. A mounting block 16 is fixedly installed on the middle side of the left end of the cover plate 13. A fixing rod 17 is provided on the lower side of the left end of the mounting block 16. A movable rod 18 is provided on the right side inside the mounting plate 2. A connecting movable plate 19 is fixedly installed on the upper side of the movable rod 18. A first spring 20 is provided on the left side of the upper end of the connecting movable plate 19. A moving rod 21 is connected through the middle of the first spring 20. The mounting plate 2 is placed on the right side of the boiler flue 1, so that the mounting plate 2 is engaged on the outer side of the right end of the boiler flue 1, thereby... The mounting plate 2 is attached to the outside of the sealing ring 15. Then, the cover plate 13 is manually placed on the upper side of the mounting plate 2, so that the cover plate 13 drives the filter screen 3 on the upper side of the mounting plate 2. This causes the cover plate 13 to drive the filter screen 3 and the limiting block 14 to slide downward inside the mounting plate 2. This causes the limiting block 14 to slide downward on the upper side of the sealing ring 15. This causes the cover plate 13 to drive the mounting block 16 to slide downward. This causes the cover plate 13 to be attached to the upper side of the mounting plate 2. This causes the filter screen 3 to be attached to the inside of the mounting plate 2. This causes the cover plate 13 to drive the limiting block 14 to be engaged on the upper side of the boiler flue 1. This causes the cover plate 13 to drive the mounting block 16 to be engaged on the middle side of the left end of the mounting plate 2.

[0036] Then manually tighten the fixing rod 17, so that the fixing rod 17 is threaded on the lower left side of the mounting block 16 under the tightening action. Under the action of the thread between the fixing rod 17 and the mounting block 16, the fixing rod 17 moves to the right, and then the fixing rod 17 is threaded on the left side of the mounting plate 2. Then manually rotate the connecting movable plate 19, so that the connecting movable plate 19 rotates to the left, so that the connecting movable plate 19 drives the movable rod 18 to rotate on the right side inside the mounting plate 2, and then the connecting movable plate 19 rotates to the upper side of the cover plate 13. Manually release the moving rod 21, so that under the elastic action of the first spring 20, the first spring 20 drives the moving rod 21 to slide downward on the middle left side of the connecting movable plate 19, so that the moving rod 21 is engaged on the upper right side of the cover plate 13. This facilitates the assembly and positioning of the mounting connecting cylinder 6 and the boiler flue 1, and also facilitates the installation of the filter screen 3, which filters the exhaust gas.

[0037] Specific examples Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, a water inlet pipe 23 is fixedly installed on the upper right side of the water tank 10. A fixing block 24 is fixedly installed on the outer side of the upper end of the water inlet pipe 23. A second spring 25 is fixedly installed on the outer side of the middle part of the fixing block 24. A connecting rod 26 is connected through the middle of the second spring 25. A connecting plate 12 is movably connected to the outer side of the middle part of the connecting rod 26. A filter frame 27 is fixedly installed on the inner side of the lower end of the connecting plate 12. A baffle plate 28 is set on the outer side of the middle part of the water inlet pipe 23. A limiting rod 29 is movably connected to the outer side of the lower end of the baffle plate 28. The connecting rod is manually pulled outward. 26, causing the connecting rod 26 to drive the second spring 25 to extend, thereby causing the connecting rod 26 to slide outward in the middle of the fixing block 24, and thus causing the connecting rod 26 to separate from the outside of the water inlet pipe 23. Then, manually place the connecting plate 12 on the upper side of the water inlet pipe 23, causing the connecting plate 12 to drive the filter frame 27 to slide downward inside the water inlet pipe 23, thereby causing the connecting plate 12 to fit and connect on the upper side of the water inlet pipe 23, and thus causing the filter frame 27 to engage and connect inside the water inlet pipe 23.

[0038] Then manually loosen the connecting rod 26, so that under the elastic action of the second spring 25, the second spring 25 drives the connecting rod 26 to slide inward, so that the connecting rod 26 slides inward in the middle of the fixing block 24, and then the connecting rod 26 is engaged with the outside of the water inlet pipe 23. Then manually place the baffle plate 28 on the outside of the middle of the water inlet pipe 23, so that the baffle plate 28 is fitted and installed on the outside of the connecting rod 26. Then manually turn the limiting rod 29, so that the limiting rod 29 is threaded on the outside of the lower end of the baffle plate 28 under the turning action, so that the limiting rod 29 moves inward under the thread action between the limiting rod 29 and the baffle plate 28, and then the limiting rod 29 is threaded on the outside of the middle of the water inlet pipe 23, which can limit the connecting rod 26, and facilitate the limiting of the filter frame 27, thereby facilitating the filtration of water flow.

[0039] Specific examples Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, a flue gas inlet pipe 4 is fixedly installed on the middle right side of the mounting plate 2. A heat exchange cylinder 5 is fixedly installed on the right side of the flue gas inlet pipe 4. An installation connecting cylinder 6 is fixedly installed on the outside of the heat exchange cylinder 5. A hot gas outlet pipe 8 is fixedly installed on the rear left side of the installation connecting cylinder 6. A fresh gas inlet pipe 22 is installed on the front right side of the installation connecting cylinder 6. A flue gas outlet pipe 7 is fixedly installed on the middle right side of the heat exchange cylinder 5. A heat exchange connecting pipe 9 is installed on the right side of the flue gas outlet pipe 7. A water tank 10 is fixedly installed on the outside of the heat exchange connecting pipe 9. A water outlet pipe 11 is set on the lower left side of the water tank 10. The exhaust gas in the boiler enters the interior of the mounting plate 2 through the boiler flue duct 1. The filter screen 3 set inside the mounting plate 2 filters the impurities in the exhaust gas, so that the filtered exhaust gas enters the interior of the flue gas inlet pipe 4 through the mounting plate 2, and then enters the interior of the heat exchange cylinder 5 through the flue gas inlet pipe 4. At the same time, the air to be heat exchanged passes through the external connection. The exhaust fan enters the fresh air inlet pipe 22, allowing air to pass through and enter the installation connecting cylinder 6. This conducts the temperature of the exhaust gas to the heat exchange cylinder 5, which then heats the air inside the installation connecting cylinder 6 to a certain temperature before discharging it through the hot air outlet pipe 8. The exhaust gas then passes through the heat exchange cylinder 5 and enters the flue gas outlet pipe 7, which in turn enters the heat exchange connecting pipe 9. Simultaneously, water flows through the water inlet pipe 23 into the water tank 10, where the exhaust gas temperature is conducted to the heat exchange connecting pipe 9. This temperature is then transferred to the water inlet pipe 9 to heat the water flow. Finally, the valve inside the water outlet pipe 11 is opened, allowing the heated water to be discharged through the water outlet pipe 11. This process utilizes the waste heat from the boiler exhaust gas to heat both the gas and liquid, thereby improving the waste heat recovery effect of the boiler exhaust gas.

[0040] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0041] 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 boiler exhaust gas waste heat recovery device, comprising: Boiler flue (1), its right side is provided with mounting plate (2); It is characterized in that, further comprising: Cover plate (13), which is arranged on the upper side of the mounting plate (2), the right end of the cover plate (13) is fixedly installed with a filter screen (3), and the left side of the cover plate (13) is provided with a moving structure, the moving structure comprises a limiting block (14), an installation block (16) and a fixed rod (17), and the limiting block (14) is installed on the left end of the cover plate (13) The lower side, the upper end of the cover plate (13) is installed with the installation block (16), and the left side of the installation block (16) is connected with the fixed rod (17); Water tank (10), which is arranged on the right side of the mounting plate (2), and the upper end of the water tank (10) is installed with the water inlet pipe (23), the upper side of the water inlet pipe (23) is connected with the connecting plate (12), and the lower side of the connecting plate (12) is provided with the filter frame (27), the upper end of the water inlet pipe (23) is connected with the limiting structure, and the limiting structure comprises a fixed block (24), a second spring (25) and a connecting rod (26), the fixed block (24) is installed on the upper end of the water inlet pipe (23), the outer side of the fixed block (24) is provided with the second spring (25), and the middle part of the second spring (25) is connected with the connecting rod (26), the water inlet pipe (23) and the connecting plate (12) are connected, the connecting plate (12) and the connecting rod (26) are connected, and the connecting rod (26) is symmetrically distributed about the center line of the water inlet pipe (23), the outer side of the middle part of the water inlet pipe (23) is also provided with a baffle (28), and the outer side of the lower end of the baffle (28) is movably connected with a limiting rod (29), the baffle (28) and the limiting rod (29) are connected by screw thread, and the baffle (28) and the connecting rod (26) are connected.

2. A boiler exhaust gas waste heat recovery device according to claim 1, characterized in that: The inner left side of the mounting plate (2) is also fixedly provided with a sealing ring (15), and the inner right side of the mounting plate (2) is provided with a movable rod (18), the upper side of the movable rod (18) is fixedly installed with a connecting movable plate (19), the upper end of the connecting movable plate (19) is provided with a first spring (20), and the middle part of the first spring (20) is connected with a moving rod (21).

3. A boiler exhaust gas waste heat recovery device according to claim 2, characterized in that: The right end of the mounting plate (2) is also fixedly installed with a flue gas inlet pipe (4), and the right end of the flue gas inlet pipe (4) is fixedly installed with a heat exchange cylinder (5), the middle part of the flue gas inlet pipe (4) is fixedly installed with an installation connecting cylinder (6), and the right end of the installation connecting cylinder (6) is provided with a new gas inlet pipe (22), and the left end of the installation connecting cylinder (6) is provided with a hot gas outlet pipe (8).

4. A boiler exhaust gas waste heat recovery device according to claim 3, characterized in that: The right side of the heat exchange cylinder (5) is also fixedly installed with a flue gas outlet pipe (7), and the right side of the flue gas outlet pipe (7) is fixedly installed with a heat exchange connecting pipe (9), the outer side of the heat exchange connecting pipe (9) is fixedly connected with the inner side of the water tank (10), and the left end of the water tank (10) is installed with a water outlet pipe (11).

5. A boiler exhaust gas waste heat recovery device according to claim 3, characterized in that: The installation connecting cylinder (6) and the heat exchange cylinder (5) form an inner cavity for the flow of air to be heated.

6. A boiler exhaust heat recovery device according to claim 1, characterized in that: The mounting block (16) is snap-connected with the mounting plate (2), and the vertical section shape of the mounting block (16) is an "L" shaped structure.

7. A boiler exhaust gas waste heat recovery device according to claim 2, characterized in that: The connecting movable plate (19) is telescopic slidingly connected with the moving rod (21), and the moving rod (21) is snap-connected with the cover plate (13).

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