Anti-corrosion flue gas recirculation device for boiler

Abstract

The utility model relates to the technical field of flue gas recirculation, in particular to a boiler anti-corrosion flue gas recirculation device which comprises a wagon balance and a waste heat boiler, a support is arranged at the top end of the wagon balance, a desulfurization tank is fixedly connected to the top end of the support, a second gate valve is fixedly connected to the middle of the bottom end of the desulfurization tank, and a discharge pipe is fixedly connected to the bottom end of the second gate valve. A first gate valve is fixedly connected to the top end of the desulfurization tank, a storage tank is fixedly connected to the top end of the first gate valve, guide plates are fixedly connected to the upper side and the lower side of the interior of the desulfurization tank, a first flue is fixedly connected to the front of the right end of the waste heat boiler, and a fourth flue is fixedly connected to the rear of the right end of the waste heat boiler. Sulfur oxides in the flue gas react with a desulfurizing agent in the desulfurizing tank, so that erosion of the sulfur oxides to subsequent pipelines and equipment is reduced, meanwhile, the guide plate is additionally arranged in the desulfurizing tank, the contact time of the flue gas and an absorbent is prolonged, and the desulfurizing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas recirculation, in particular to a boiler anti-corrosion flue gas recirculation device. Background Art

[0002] Flue gas recirculation is a technology used to reduce nitrogen oxide emissions. By introducing a part of the already combusted flue gas back into the combustion chamber and mixing it with fresh air or fuel for combustion, the combustion temperature and oxygen content are reduced, thereby reducing the generation of nitrogen oxides.

[0003] The patent specification with the publication number CN221076503U discloses a flue gas recirculation system for a waste incinerator with anti-corrosion design, including a second flue, a first Y-shaped pipe and fillet weld flanges. The number of fillet weld flanges is multiple. The upper end of the second flue is fixedly connected to the lower end of the first Y-shaped pipe through fillet weld flanges. A cleaning assembly is installed inside the first Y-shaped pipe. The cleaning assembly includes a first fixing rod, and both ends of the first fixing rod are fixedly connected to the inner surface of the first Y-shaped pipe. A second fixing rod is fixedly connected to the inner surface of the upper end of the second flue. A motor is fixedly connected to the lower surface of the second fixing rod. The output shaft of the motor passes through the lower surface of the second fixing rod and extends above the second fixing rod. The end of the output shaft of the motor is fixedly connected to a rotating shaft, and the upper end of the rotating shaft is movably connected to the lower surface of the first fixing rod. The utility model can clean the corrosive particles attached to the inner wall of the pipeline, effectively preventing the inside of the pipeline from being corroded.

[0004] However, in the implementation of the related technology, it is found that the above-mentioned flue gas recirculation system for a waste incinerator with anti-corrosion design has the following problems: during the flue gas circulation process, in addition to corrosive particles, sulfur oxides in the flue gas will also cause certain corrosion to the pipeline. Sulfur oxides will directly react with metals at high temperatures to form metal sulfides, thereby reducing the strength and toughness of metal materials. In view of this, a boiler anti-corrosion flue gas recirculation device is provided to overcome the above defects. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the defects existing in the prior art, and a boiler anti-corrosion flue gas recirculation device is proposed.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A boiler anti-corrosion flue gas recirculation device, including a weighbridge and a waste heat boiler. A support is placed on the top of the weighbridge, and a desulfurization tank is fixedly connected to the top of the support. A second gate valve is fixedly connected to the middle of the bottom of the desulfurization tank, and a discharge pipe is fixedly connected to the bottom of the second gate valve. A first gate valve is fixedly connected to the top of the desulfurization tank, and a storage tank is fixedly connected to the top of the first gate valve. Guide plates are fixedly connected to the upper and lower sides inside the desulfurization tank. A first flue is fixedly connected to the front of the right end of the waste heat boiler, a fourth flue is fixedly connected to the rear of the right end of the waste heat boiler, a third flue is fixedly connected to the front end on the right side of the fourth flue, and a second flue is fixedly connected to one end of the third flue away from the fourth flue.

[0007] As a further description of the above technical solution: The right end of the first flue is fixedly connected to the lower left end of the desulfurization tank, and the left end of the second flue is fixedly connected to the upper right end of the desulfurization tank. Through the designed cooperation, when the flue gas passes through the desulfurization tank, the sulfur oxides in the flue gas react with the desulfurizing agent in the desulfurization tank, thereby reducing the erosion of the subsequent pipeline by sulfur oxides.

[0008] As a further description of the above technical solution: The guide plates are inclined planes. The guide plate on the upper side inside the desulfurization tank is inclined downward from right to left, and the guide plate on the lower side inside the desulfurization tank is inclined downward from left to right. The inclined angles of the inclined planes of the two guide plates inside the desulfurization tank are both 15 degrees, which reduces the short-circuit flow phenomenon of the flue gas in the tower without affecting the feeding of the desulfurizing agent, prolongs the contact time between the flue gas and the absorbent, and improves the desulfurization efficiency.

[0009] As a further description of the above technical solution: An air inlet hole is opened in the lower left side of the desulfurization tank, and the inside of the air inlet hole is fixedly connected to the outer side of the first flue. An air outlet hole is opened in the upper right side of the desulfurization tank, and the inside of the air outlet hole is fixedly connected to the outer side of the second flue, so that the flue gas in the first flue enters the desulfurization tank through the air inlet hole and enters the second flue through the air outlet hole after desulfurization.

[0010] As a further description of the above technical solution: The internal capacity of the storage tank is half of the internal capacity of the desulfurization tank. A cover plate is provided at the top of the storage tank. The addition amount of the desulfurizing agent can be indirectly determined through the storage tank, and the cover plate is provided to reduce the entry of external dust, etc. into the storage tank and affect the function of the desulfurizing agent.

[0011] As a further description of the above technical solution: A filter plate is fixedly connected between the first flue and the second flue. A fixed frame is slidably connected inside the filter plate. A filter bag is fixedly connected to the left side inside the fixed frame, and a silica gel plate is fixedly connected to the right side inside the fixed frame, so that when the flue gas passes through the filter plate, the fly ash in the flue gas can be filtered through the filter bag, and the residual moisture in the flue gas can be adsorbed through the silica gel plate, reducing the influence of fly ash and water vapor on the desulfurization tank and the pipeline.

[0012] As a further description of the above technical solution: a transverse circular through-hole and a longitudinal chute are provided in the middle of the filter plate, and the diameter of the transverse circular through-hole of the filter plate is the same as the inner diameters of the first flue and the second flue. The cross-section of the longitudinal chute of the filter plate is the same as the outer contour of the bottom end of the fixing frame, so that the fixing frame can be taken out from the filter plate, facilitating the cleaning and replacement of the filter bag and the silica gel plate.

[0013] The utility model has the following beneficial effects:

[0014] A boiler anti-corrosion flue gas recirculation device designed by the utility model, through design cooperation, enables the sulfur oxides in the flue gas to react with the desulfurizing agent in the desulfurization tank when the flue gas passes through the desulfurization tank, thereby reducing the erosion of sulfur oxides on the subsequent pipelines and equipment. At the same time, by adding a guiding plate inside the desulfurization tank, the flow path of the flue gas in the desulfurization tank is increased, the short-circuit flow phenomenon of the flue gas in the desulfurization tank is reduced, and the flue gas is more evenly distributed in the desulfurization tank, thereby prolonging the contact time between the flue gas and the absorbent and improving the desulfurization efficiency;

[0015] A boiler anti-corrosion flue gas recirculation device designed by the utility model, through design cooperation, enables the fly ash in the flue gas to be filtered by the filter bag and the residual moisture in the flue gas to be adsorbed by the silica gel plate when the flue gas passes through the filter plate, reducing the influence of fly ash and water vapor on the desulfurization tank and pipelines. At the same time, the fixing frame in the filter plate can be taken out from the chute of the filter plate, facilitating the cleaning and replacement of the filter bag and the silica gel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is a schematic diagram of the longitudinal sectional structure of the desulfurization tank of the utility model;

[0018] Figure 3 is a schematic diagram of the exploded structure of the filter plate of the utility model;

[0019] Figure 4 is a schematic diagram of the longitudinal sectional structure of the filter plate of the utility model.

[0020] Legend:

[0021] 1. Waste heat boiler; 2. Weighbridge; 3. Support; 4. Discharge pipe; 5. Desulfurization tank; 6. First gate valve; 7. Storage tank; 8. Filter plate; 9. Fixing frame; 10. Filter bag; 11. Silica gel plate; 12. First flue; 13. Second flue; 14. Third flue; 15. Fourth flue; 16. Guiding plate; 17. Second gate valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Refer to Figures 1 to 4, a flue gas recirculation device for boiler anti-corrosion provided by the utility model, includes a weighbridge 2 and a waste heat boiler 1. A support 3 is placed on the top of the weighbridge 2. The top of the support 3 is welded and fixed to a desulfurization tank 5. The middle of the bottom of the desulfurization tank 5 is fixed with a second gate valve 17 by bolts. The bottom of the second gate valve 17 is fixed with a discharge pipe 4 by bolts. The top of the desulfurization tank 5 is fixed with a first gate valve 6 by bolts. The top of the first gate valve 6 is fixed with a storage tank 7 by bolts. Guide plates 16 are welded and fixed on the upper and lower sides inside the desulfurization tank 5. The front of the right end of the waste heat boiler 1 is fixed with a first flue 12 by bolts. The rear of the right end of the waste heat boiler 1 is fixed with a fourth flue 15 by bolts. The front end of the right side of the fourth flue 15 is welded and fixed to a third flue 14. One end of the third flue 14 away from the fourth flue 15 is welded and fixed to a second flue 13.

[0023] As a further description of the above technical solution: The right end of the first flue 12 is welded and fixed to the lower left end of the desulfurization tank 5. The left end of the second flue 13 is welded and fixed to the upper right end of the desulfurization tank 5. Through the designed cooperation, when the flue gas passes through the desulfurization tank 5, sulfur dioxide in the flue gas reacts with the desulfurizing agent in the desulfurization tank 5, thereby reducing the erosion of sulfur oxides on the subsequent pipelines.

[0024] As a further description of the above technical solution: The guide plates 16 are inclined planes. The guide plate 16 on the upper side inside the desulfurization tank 5 is inclined downward from right to left, and the guide plate 16 on the lower side inside the desulfurization tank 5 is inclined downward from left to right. The inclination angles of the inclined planes of the two guide plates 16 inside the desulfurization tank 5 are both 15 degrees, so as to reduce the short-circuit flow phenomenon of the flue gas in the desulfurization tank 5 without affecting the feeding of the desulfurizing agent, extend the contact time between the flue gas and the absorbent, and improve the desulfurization efficiency.

[0025] As a further description of the above technical solution: An air inlet hole is provided at the lower left side of the desulfurization tank 5, and the inside of the air inlet hole is fixedly connected to the outer side of the first flue 12. An air outlet hole is provided at the upper right side of the desulfurization tank 5, and the inside of the air outlet hole is fixedly connected to the outer side of the second flue 13, so that the flue gas in the first flue 12 enters the desulfurization tank 5 through the air inlet hole and enters the second flue 13 through the air outlet hole after desulfurization.

[0026] As a further description of the above technical solution: The internal capacity of the storage tank 7 is half of the internal capacity of the desulfurization tank 5. A cover plate is provided at the top of the storage tank 7. The addition amount of the desulfurizing agent can be indirectly determined through the storage tank 7, and the cover plate is provided to reduce the entry of external dust, etc. into the storage tank 7 and affect the desulfurizing agent from playing its role.

[0027] As a further description of the above technical solution: A filter plate 8 is fixed between the first flue 12 and the second flue 13 by bolts. A fixing frame 9 is slidably connected inside the filter plate 8. A filter bag 10 is fixed to the left side inside the fixing frame 9 by bolts, and a silica gel plate 11 is fixed to the right side inside the fixing frame 9 by bolts. When the flue gas passes through the filter plate 8, the fly ash in the flue gas can be filtered by the filter bag 10, and the residual moisture in the flue gas can be adsorbed by the silica gel plate 11, reducing the influence of fly ash and water vapor on the desulfurization tank 5 and the pipeline.

[0028] As a further description of the above technical solution: The filter plate 8 is provided with a horizontal circular through hole and a longitudinal chute in the middle. The diameter of the horizontal circular through hole of the filter plate 8 is the same as the inner diameter of the first flue 12 and the second flue 13. The cross-section of the longitudinal chute of the filter plate 8 is the same as the outer contour of the bottom end of the fixing frame 9, so that the fixing frame 9 can be taken out from the filter plate 8, facilitating the cleaning and replacement of the filter bag 10 and the silica gel plate 11.

[0029] During specific implementation: Open the top cover plate of the storage tank 7 to add desulfurizing agent, and open the first gate valve 6 at the bottom end of the storage tank 7, so that the desulfurizing agent in the storage tank 7 enters the interior of the desulfurization tank 5. The addition of the desulfurizing agent can be understood through the reading of the weighing scale 2 at the bottom end of the support 3. During normal operation, the flue gas generated by the waste heat boiler 1 enters the first flue 12. When the flue gas passes through the filter plate 8 in the middle of the first flue 12, the filter bag 10 and the silica gel plate 11 on the fixing frame 9 inside the filter plate 8 can preliminarily filter the fly ash and water vapor in the flue gas, reducing the influence on the desulfurization tank 5. The flue gas entering the desulfurization tank 5 reacts with the desulfurizing agent, consuming the sulfur oxides in the flue gas. Since a guiding plate 16 is provided inside the desulfurization tank 5, the flue gas cannot directly discharge from the air outlet hole of the desulfurization tank 5, so that the flue gas is more evenly distributed in the desulfurization tank 5, improving the desulfurization efficiency. The desulfurized flue gas passes through the filter plate 8 in the middle of the second flue 13, performing secondary filtration on the fly ash and water vapor in the flue gas, minimizing the fly ash and water vapor in the flue gas as much as possible. The filtered flue gas returns to the waste heat boiler 1 through the third flue 14 and the fourth flue 15, realizing flue gas recirculation. After using for a period of time, by pulling out the fixing frame 9 from the chute of the filter plate 8, the filter bag 10 and the silica gel plate 11 on the fixing frame 9 can be cleaned and replaced, avoiding the situation of pipeline blockage caused by fly ash accumulation. Since the weight of the desulfurizing agent inside the desulfurization tank 5 will change after absorbing the flue gas, when the increase in the value on the weighing scale 2 is not obvious, it indicates that the reaction effect of the desulfurizing agent is not ideal. Open the second gate valve 17 at the bottom end of the desulfurization tank 5 to discharge the desulfurizing agent from the discharge pipe 4, realizing the replacement of the desulfurizing agent.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A boiler anti-corrosion flue gas recirculation device, comprising a weighbridge (2) and a waste heat boiler (1), characterized in that: A support (3) is placed on the top of the weighbridge (2). A desulfurization tank (5) is fixedly connected to the top of the support (3). A second gate valve (17) is fixedly connected to the middle of the bottom end of the desulfurization tank (5). A discharge pipe (4) is fixedly connected to the bottom end of the second gate valve (17). A first gate valve (6) is fixedly connected to the top of the desulfurization tank (5). A storage tank (7) is fixedly connected to the top of the first gate valve (6). Guide plates (16) are fixedly connected to the upper and lower sides inside the desulfurization tank (5). A first flue (12) is fixedly connected to the front of the right end of the waste heat boiler (1). A fourth flue (15) is fixedly connected to the rear of the right end of the waste heat boiler (1). A third flue (14) is fixedly connected to the front end of the right side of the fourth flue (15). One end of the third flue (14) away from the fourth flue (15) is fixedly connected to a second flue (13).

2. The flue gas recirculation device for boiler corrosion prevention according to claim 1, wherein: The right end of the first flue (12) is fixedly connected to the left end below the desulfurization tank (5). The left end of the second flue (13) is fixedly connected to the right end above the desulfurization tank (5).

3. The flue gas recirculation device for preventing corrosion of a boiler according to claim 1, wherein: The guide plates (16) are inclined planes. The guide plate (16) on the upper side inside the desulfurization tank (5) is inclined downward from right to left, and the guide plate (16) on the lower side inside the desulfurization tank (5) is inclined downward from left to right. The inclined angles of the inclined planes of the two guide plates (16) inside the desulfurization tank (5) are both 15 degrees.

4. A boiler anti-corrosion flue gas recirculation device according to claim 1, characterized in that: An air inlet hole is provided below the left side of the desulfurization tank (5), and the inside of the air inlet hole is fixedly connected to the outer side surface of the first flue (12). An air outlet hole is provided above the right side of the desulfurization tank (5), and the inside of the air outlet hole is fixedly connected to the outer side surface of the second flue (13).

5. The flue gas recirculation device for boiler anti-corrosion according to claim 1, characterized in that: The internal capacity of the storage tank (7) is half of the internal capacity of the desulfurization tank (5). A cover plate is provided at the top of the storage tank (7).

6. The flue gas recirculation device for boiler anti-corrosion according to claim 1, characterized in that: A filter plate (8) is fixedly connected between the first flue (12) and the second flue (13). A fixing frame (9) is slidably connected inside the filter plate (8). A filter bag (10) is fixedly connected to the left side inside the fixing frame (9). A silica gel plate (11) is fixedly connected to the right side inside the fixing frame (9).

7. The flue gas recirculation device for boiler anti-corrosion according to claim 6, characterized in that: A horizontal circular through hole and a longitudinal chute are provided in the middle of the filter plate (8). The diameter of the horizontal circular through hole of the filter plate (8) is the same as the inner diameter of the first flue (12) and the second flue (13). The cross section of the longitudinal chute of the filter plate (8) is the same as the outer contour of the bottom end of the fixing frame (9).

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