A boiler flue gas desulfurization device

Abstract

This utility model discloses a boiler flue gas desulfurization device, relating to the field of boiler flue gas treatment technology. It includes a desulfurization tower with a liquid outlet pipe connected to its outer surface. A sedimentation tank is located to the right of the desulfurization tower, and the end of the liquid outlet pipe furthest from the desulfurization tower is connected to the upper surface of the sedimentation tank. A filter press is located below the sedimentation tank. This utility model transports impurity slurry to the sedimentation tank via the liquid outlet pipe, where large particles settle due to gravity. The upper clarifying absorbent is retained. The clarifying absorbent is pumped through a branch pipe to a four-way pipe, and then sent to the filter tank via a delivery pipe. This avoids a sudden drop in the sedimentation tank level due to a single pumping operation. Combined with the action of the filter plate and activated carbon plate, it intercepts fine impurities such as residual calcium sulfite aggregates in the clarifying absorbent, while simultaneously adsorbing trace amounts of heavy metals and organic matter. This restores the activity of the purified absorbent to a higher level than that of fresh absorbent, ultimately significantly improving the secondary utilization rate of the absorbent.

Description

Technical Field

[0001] This utility model relates to the field of boiler flue gas treatment technology, and in particular to a boiler flue gas desulfurization device. Background Technology

[0002] A boiler is a thermal power device that uses the heat energy released by fuel combustion to heat a working medium (usually water or steam) to specified parameters (temperature, pressure). It is widely used in industrial production (such as power generation, chemical industry, and metallurgy) and residential heating. Its core function is "energy conversion," which converts the chemical energy of fuels such as coal, natural gas, and heavy oil into heat energy through combustion, and then transfers it to the working medium. Finally, it is output in the form of high-temperature steam or hot water to provide power for production processes (such as driving steam turbines to generate electricity) or to meet heating needs.

[0003] In most existing boiler flue gas desulfurization devices, if the desulfurization absorbent reacts with SO2 in the flue gas to generate a slurry containing impurities during the desulfurization process, it is directly discharged as waste liquid or waste residue without being filtered, purified, or recycled. This not only causes serious waste of resources but also leads to a passive increase in the operating costs of the device. Therefore, this utility model provides a boiler flue gas desulfurization device to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, this utility model provides a boiler flue gas desulfurization device to solve the problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A boiler flue gas desulfurization device includes a desulfurization tower, an outlet pipe connected to the outer surface of the desulfurization tower, a sedimentation tank located to the right of the desulfurization tower, an end of the outlet pipe away from the desulfurization tower connected to the upper surface of the sedimentation tank, a filter press located below the sedimentation tank, a filter box located to the right of the desulfurization tower, a third water pump installed to the right of the desulfurization tower, an output end of the third water pump connected to the upper surface of the filter box, an input end of the third water pump connected to a conveying pipe, an end of the conveying pipe away from the third water pump connected to a four-way pipe, a plurality of conveying branch pipes connected to the outer surface of the four-way pipe, an end of each conveying branch pipe away from the four-way pipe connected to the outer surface of the sedimentation tank, and a plurality of sliding grooves formed on the inner wall of the filter box, wherein filter plates are slidably connected to the inner walls of two sets of sliding grooves, and activated carbon plates are slidably connected to the inner walls of the other set of sliding grooves.

[0006] As a further technical solution of this utility model, a liquid storage tank is provided on the right side of the desulfurization tower, and a second water pump is installed on the right side of the desulfurization tower. The input end of the second water pump is connected to the outer surface of the filter box, and the output end of the second water pump is connected to a water supply pipe. The end of the water supply pipe away from the second water pump is connected to the upper surface of the liquid storage tank.

[0007] As a further technical solution of this utility model, a first water pump is installed on the right side of the desulfurization tower. The input end of the first water pump is connected to the outer surface of the storage tank, and the output end of the first water pump is connected to a delivery pipe. The end of the delivery pipe away from the first water pump passes through the desulfurization tower and is connected to an annular water pipe. The outer surface of the annular water pipe is connected to multiple fan-shaped atomizing nozzles.

[0008] As a further technical solution of this utility model, a mixing layer is installed inside the desulfurization tower, a partition is fixedly connected inside the desulfurization tower, and a communication port is opened on the outer surface of the partition.

[0009] As a further technical solution of this utility model, a motor is installed on the bottom surface of the desulfurization tower, and an agitator shaft is installed after the output end of the motor passes through the desulfurization tower. Multiple agitator blades are installed on the outer surface of the agitator shaft.

[0010] As a further technical solution of this utility model, the upper surface of the desulfurization tower is connected to a discharge pipe, a demister is provided above the desulfurization tower, the input end of the demister is connected to the top of the discharge pipe, the output end of the demister is connected to a first connecting pipe, an induced draft fan is installed on the upper surface of the desulfurization tower, and two support columns are fixedly connected to the outer surface of the induced draft fan, with the end of each support column away from the induced draft fan connected to the upper surface of the desulfurization tower.

[0011] As a further technical solution of this utility model, the outer surface of the desulfurization tower is connected to a flue gas inlet pipe, the outer surface of the desulfurization tower is equipped with a controller, the bottom surface of the sedimentation tank is connected to a funnel, the bottom surface of the funnel is connected to a second connecting pipe, the bottom end of the second connecting pipe is connected to the input end of the filter press, the outer surface of the second connecting pipe is equipped with a third electronic valve, the outer surface of the filter press is fixedly connected with multiple fixed columns, the bottom surface of the sedimentation tank is equipped with multiple support legs, and the end of each fixed column away from the filter press is connected to the outer surface of the support leg.

[0012] As a further technical solution of this utility model, the outer surface of the liquid outlet pipe is connected to a second electronic valve, and the outer surface of each of the conveying branch pipes is equipped with a first electronic valve. A support plate is provided on the right side of the desulfurization tower, and the upper surface of the support plate is connected to the bottom surface of the filter box and the liquid storage tank respectively. The front of the filter box is hinged with a door.

[0013] This utility model provides a boiler flue gas desulfurization device, which has the following advantages compared with the prior art: 1. This design presents a boiler flue gas desulfurization device that transports impurity slurry to a settling tank via an outlet pipe. Large particles of impurities settle due to gravity, while the upper layer of clarifying absorbent remains. The clarified absorbent is pumped through a branch pipe to a four-way pipe, and then sent to a filter box via a delivery pipe. This avoids a sudden drop in the settling tank level caused by a single pumping operation, ensuring a significant increase in the recovery rate of the clarified absorbent. Combined with the synergistic effect of the filter plate and activated carbon plate, it intercepts fine impurities such as residual calcium sulfite aggregates in the clarified absorbent, while simultaneously adsorbing trace amounts of heavy metals and organic matter. This restores the activity of the purified absorbent to a higher level than that of fresh absorbent, ultimately significantly improving the secondary utilization rate of the absorbent. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a boiler flue gas desulfurization device; Figure 2 This is a front view of a boiler flue gas desulfurization device; Figure 3 This is a rear view of a boiler flue gas desulfurization device; Figure 4 This is a schematic diagram of the internal structure of the desulfurization tower in a boiler flue gas desulfurization device; Figure 5 This is a schematic diagram of the internal structure of a filter box in a boiler flue gas desulfurization device.

[0015] In the diagram: 1. Desulfurization tower; 2. Exhaust fan; 3. Support column; 4. First connecting pipe; 5. Demister; 6. Controller; 7. Door; 8. Delivery pipe; 9. Third water pump; 10. Four-way pipe; 11. Sedimentation tank; 12. Support plate; 13. Discharge pipe; 14. Liquid delivery pipe; 15. Delivery branch pipe; 16. First electronic valve; 17. Fixed column; 18. Liquid outlet pipe; 19. Second electronic valve; 20. Water delivery pipe; 21. Second water pump 22. First water pump; 23. Filter press; 24. Third electronic valve; 25. Funnel; 26. Second connecting pipe; 27. Filter box; 28. Motor; 29. ​​Annular water pipe; 30. Fan-shaped atomizing nozzle; 31. Mixing layer; 32. Connecting port; 33. Baffle; 34. Stirring blade; 35. Stirring shaft; 36. Slide groove; 37. Filter plate; 38. Activated carbon plate; 39. Liquid storage tank; 40. Smoke inlet pipe; 41. Support leg. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5 This utility model provides a technical solution for a boiler flue gas desulfurization device: it includes a desulfurization tower 1, with multiple mounting columns welded to the bottom surface of the desulfurization tower 1 for support, an outlet pipe 18 connected to the outer surface of the desulfurization tower 1, a sedimentation tank 11 located on the right side of the desulfurization tower 1, the end of the outlet pipe 18 away from the desulfurization tower 1 connected to the upper surface of the sedimentation tank 11, a filter press 23 located below the sedimentation tank 11, a filter box 27 located on the right side of the desulfurization tower 1, and a third water pump 9 installed on the right side of the desulfurization tower 1, the output end of the third water pump 9 connected to the filter box. The upper surface of the filter box 27 is connected to the input end of the third water pump 9, which is connected to the conveying pipe 8. The end of the conveying pipe 8 away from the third water pump 9 is connected to the four-way pipe 10. The outer surface of the four-way pipe 10 is connected to multiple conveying branch pipes 15. The end of each conveying branch pipe 15 away from the four-way pipe 10 is connected to the outer surface of the sedimentation tank 11. The inner wall of the filter box 27 is provided with multiple sliding grooves 36. The inner walls of two sets of sliding grooves 36 are slidably connected to filter plates 37, and the inner walls of the other set of sliding grooves 36 are slidably connected to activated carbon plates 38.

[0018] like Figure 3 and Figure 4 As shown, a storage tank 39 is installed to the right of desulfurization tower 1, and a second water pump 21 is installed to the right of desulfurization tower 1. The input end of the second water pump 21 is connected to the outer surface of the filter box 27, and the output end of the second water pump 21 is connected to a water supply pipe 20. The end of the water supply pipe 20 away from the second water pump 21 is connected to the upper surface of the storage tank 39. The absorbent purified by the filter box 27 is transported back to the storage tank 39 through the water supply pipe 20 under the action of the second water pump 21. A first water pump 22 is installed to the right of desulfurization tower 1. The input end is connected to the outer surface of the storage tank 39. The output end of the first water pump 22 is connected to the delivery pipe 14. The end of the delivery pipe 14 away from the first water pump 22 passes through the desulfurization tower 1 and is connected to the annular water pipe 29. The outer surface of the annular water pipe 29 is connected to multiple fan-shaped atomizing nozzles 30. The desulfurization absorbent, such as limestone slurry, in the storage tank 39 is drawn by the first water pump 22 and transported to the annular water pipe 29 inside the desulfurization tower 1 through the delivery pipe 14. Then, it is atomized and sprayed out through the multiple fan-shaped atomizing nozzles 30 on the outer surface of the annular water pipe 29.

[0019] like Figure 4As shown, a mixing layer 31 is installed inside the desulfurization tower 1. By slowing down the rising velocity of the flue gas, the contact time between the flue gas and the atomizing absorbent is extended, thereby enhancing the gas-liquid mixing effect. A baffle 33 is fixedly connected inside the desulfurization tower 1. A connecting port 32 is opened on the outer surface of the baffle 33 to ensure that the mixed gas and liquid can flow to the bottom of the desulfurization tower 1. A motor 28 is installed on the bottom surface of the desulfurization tower 1. An agitator shaft 35 is installed after the output end of the motor 28 passes through the desulfurization tower 1. Multiple agitator blades 34 are installed on the outer surface of the agitator shaft 35. The motor 28 drives the agitator shaft 35 to rotate the agitator blades 34 to prevent solid particles such as calcium sulfite in the gas-liquid mixture from agglomerating. After the fine crystals of calcium sulfate settle to the bottom of the tower, they agglomerate to prevent blockage of the liquid outlet pipe 18 or reduction of the separation efficiency of the subsequent sedimentation tank 11. The upper surface of the desulfurization tower 1 is connected to the discharge pipe 13. A demister 5 is installed above the desulfurization tower 1. The flue gas after desulfurization carries a small amount of mist droplets and is transported to the demister 5 through the discharge pipe 13 on the upper surface of the desulfurization tower 1. The input end of the demister 5 is connected to the top of the discharge pipe 13, and the output end of the demister 5 is connected to the first connecting pipe 4. An induced draft fan 2 is installed on the upper surface of the desulfurization tower 1. Two support columns 3 are fixedly connected to the outer surface of the induced draft fan 2. The end of each support column 3 away from the induced draft fan 2 is connected to the upper surface of the desulfurization tower 1.

[0020] like Figure 1 and Figure 2As shown, the outer surface of the desulfurization tower 1 is connected to the flue gas inlet pipe 40. The SO2-containing flue gas generated by the boiler enters the inner part of the desulfurization tower 1 through the flue gas inlet pipe 40 on the outer surface of the desulfurization tower 1. A controller 6 is installed on the outer surface of the desulfurization tower 1. The bottom surface of the sedimentation tank 11 is connected to the funnel 25. The bottom surface of the funnel 25 is connected to the second connecting pipe 26. The bottom end of the second connecting pipe 26 is connected to the input end of the filter press 23. A third electronic valve 24 is installed on the outer surface of the second connecting pipe 26. Multiple fixed columns 17 are fixedly connected to the outer surface of the filter press 23. Multiple support legs 41 are installed on the bottom surface of the sedimentation tank 11. The end of each fixed column 17 away from the filter press 23 is connected to the outer surface of the support leg 41. The outer surface of the liquid outlet pipe 18 is connected to the second electronic valve 19. Under the control of the controller 6, the high-concentration impurities settling at the bottom of the sedimentation tank 11 open the outer surface of the second connecting pipe 26. The third electronic valve 24 is conveyed through the funnel 25 and the second connecting pipe 26 to the filter press 23 below the sedimentation tank 11. The filter press 23 is connected and fixed to the support leg 41 by the fixed column 17. The filter press 23 pressurizes and filters high-concentration impurities to separate "solid filter cake". The main component of the solid filter cake is calcium sulfate, i.e. gypsum, which can be recycled as building material such as gypsum board raw material. The outer surface of each conveying branch pipe 15 is equipped with a first electronic valve 16. A support plate 12 is set on the right side of the desulfurization tower 1. Multiple mounting columns are installed on the bottom surface of the support plate 12 for support. The upper surface of the support plate 12 is connected to the bottom surface of the filter box 27 and the liquid storage tank 39 respectively. The front of the filter box 27 is hinged with a door 7. When opened, the filter plate 37 and the activated carbon plate 38 can be disassembled or installed through the slide groove 36 for maintenance or replacement of the filter components.

[0021] The working principle of this utility model is as follows: After the SO2-containing flue gas from the boiler enters the desulfurization tower 1, it reacts fully with the desulfurization absorbent inside the tower, generating solid impurities such as calcium sulfite and calcium sulfate, thus forming an "absorbent slurry containing impurities". The slurry containing impurities after the reaction flows out through the liquid outlet pipe 18 on the outer surface of the desulfurization tower 1 and is directly transported to the sedimentation tank 11 on the right side of the desulfurization tower 1. The sedimentation tank 11 will be allowed to stand for a period of time that can be flexibly adjusted according to the concentration of impurities. Utilizing the density difference between solid impurities such as large-particle calcium sulfate, residual dust in the flue gas and the absorbent, the impurities will naturally settle to the bottom of the sedimentation tank 11, while the upper layer forms a "clarified absorbent", achieving preliminary solid-liquid separation. The clarified absorbent on the upper layer of the sedimentation tank 11 flows out through multiple conveying branch pipes 15 connected to its outer surface. The flow rate can be controlled by the branch pipe valves to avoid a sudden drop in the liquid level in the sedimentation tank 11 due to a single pumping. All conveying branch pipes 15 eventually converge into the four-way pipe 10. The four-way pipe 10 is connected to the third water pump 9 through the conveying pipe 8. After the input end is connected and the third water pump 9 is started, the clarifying absorbent will be pressurized and extracted, and directly delivered to the filter box 27 through its output end. After entering the filter box 27, the clarifying absorbent flows from top to bottom: first, it flows through the filter plates 37 in the two sets of slides 36 to intercept residual fine solid particles such as calcium sulfite aggregates and fine dust, removing visible impurities from the absorbent; after being treated by the filter plates 37, the absorbent continues to flow through the activated carbon plates 38 in the third set of slides 36. With the adsorption of activated carbon, trace organic matter and heavy metal ions in the absorbent are removed, further improving the purity of the absorbent and ensuring that it does not affect the desulfurization efficiency after reuse. In addition, the high-concentration impurities settled at the bottom of the sedimentation tank 11 will be discharged through the second connecting pipe 26 below the sedimentation tank 11, in conjunction with the third electronic valve 24, and delivered to the filter press 23 directly below the sedimentation tank 11; after the filter press 23 pressurizes and filters the high-concentration impurities, the resulting solid filter cake can be recycled.

[0022] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A boiler flue gas desulfurization apparatus characterized by comprising: The system includes a desulfurization tower (1), with an outlet pipe (18) connected to the outer surface of the desulfurization tower (1). A sedimentation tank (11) is located to the right of the desulfurization tower (1). The end of the outlet pipe (18) away from the desulfurization tower (1) is connected to the upper surface of the sedimentation tank (11). A filter press (23) is located below the sedimentation tank (11). A filter box (27) is located to the right of the desulfurization tower (1). A third water pump (9) is installed to the right of the desulfurization tower (1). The output end of the third water pump (9) is connected to the upper surface of the filter box (27). The input end of the filter box (27) is connected to a conveying pipe (8), and the end of the conveying pipe (8) away from the third water pump (9) is connected to a four-way pipe (10). The outer surface of the four-way pipe (10) is connected to multiple conveying branch pipes (15). The end of each conveying branch pipe (15) away from the four-way pipe (10) is connected to the outer surface of the sedimentation tank (11). The inner wall of the filter box (27) is provided with multiple sliding grooves (36). The inner walls of two sets of sliding grooves (36) are slidably connected to filter plates (37), and the inner walls of the other set of sliding grooves (36) are slidably connected to activated carbon plates (38).

2. A flue gas desulphurization device for a boiler according to claim 1, characterized in that A storage tank (39) is provided on the right side of the desulfurization tower (1), and a second water pump (21) is installed on the right side of the desulfurization tower (1). The input end of the second water pump (21) is connected to the outer surface of the filter box (27), and the output end of the second water pump (21) is connected to a water supply pipe (20). The end of the water supply pipe (20) away from the second water pump (21) is connected to the upper surface of the storage tank (39).

3. A flue gas desulphurization device for a boiler according to claim 1, characterized in that, A first water pump (22) is installed on the right side of the desulfurization tower (1). The input end of the first water pump (22) is connected to the outer surface of the liquid storage tank (39). The output end of the first water pump (22) is connected to a liquid delivery pipe (14). The end of the liquid delivery pipe (14) away from the first water pump (22) passes through the desulfurization tower (1) and is connected to an annular water pipe (29). The outer surface of the annular water pipe (29) is connected to multiple fan-shaped atomizing nozzles (30).

4. A flue gas desulphurization device for a boiler according to claim 1, characterized in that, The desulfurization tower (1) has a mixing layer (31) installed inside, and a partition (33) is fixedly connected inside the desulfurization tower (1). The outer surface of the partition (33) has a communication port (32).

5. A boiler flue gas desulfurization device according to claim 1, characterized in that, A motor (28) is installed on the bottom surface of the desulfurization tower (1). The output end of the motor (28) passes through the desulfurization tower (1) and is connected to a stirring shaft (35). Multiple stirring blades (34) are installed on the outer surface of the stirring shaft (35).

6. A boiler flue gas desulfurization device according to claim 1, characterized in that, The upper surface of the desulfurization tower (1) is connected to a discharge pipe (13). A demister (5) is installed above the desulfurization tower (1). The input end of the demister (5) is connected to the top of the discharge pipe (13). The output end of the demister (5) is connected to a first connecting pipe (4). An induced draft fan (2) is installed on the upper surface of the desulfurization tower (1). Two support columns (3) are fixedly connected to the outer surface of the induced draft fan (2). The end of each support column (3) away from the induced draft fan (2) is connected to the upper surface of the desulfurization tower (1).

7. A boiler flue gas desulfurization device according to claim 1, characterized in that, The outer surface of the desulfurization tower (1) is connected to the flue gas inlet pipe (40), and the outer surface of the desulfurization tower (1) is equipped with a controller (6). The bottom surface of the sedimentation tank (11) is connected to the funnel (25), and the bottom surface of the funnel (25) is connected to the second connecting pipe (26). The bottom end of the second connecting pipe (26) is connected to the input end of the filter press (23). The outer surface of the second connecting pipe (26) is equipped with a third electronic valve (24). The outer surface of the filter press (23) is fixedly connected with multiple fixed columns (17). The bottom surface of the sedimentation tank (11) is equipped with multiple support legs (41). The end of each fixed column (17) away from the filter press (23) is connected to the outer surface of the support leg (41).

8. A boiler flue gas desulfurization device according to claim 1, characterized in that, The outer surface of the outlet pipe (18) is connected to a second electronic valve (19), and the outer surface of each of the conveying branch pipes (15) is equipped with a first electronic valve (16). A support plate (12) is provided on the right side of the desulfurization tower (1). The upper surface of the support plate (12) is connected to the bottom surface of the filter box (27) and the storage tank (39) respectively. The front of the filter box (27) is hinged with a door (7).

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