Device for evaporative concentration of desulfurization wastewater by using low-temperature flue gas

Abstract

The application discloses a device for evaporating and concentrating desulfurization wastewater by using low-temperature flue gas, which comprises an evaporation tower and a buffer tank located on one side of the evaporation tower, wherein the buffer tank is connected with the evaporation tower through a pipeline, a horizontal demister one is arranged in the evaporation tower, an atomizing and spraying assembly is arranged below the demister one and in the evaporation tower, a desulfurization wastewater clear liquid circulating pipeline connected with the atomizing and spraying assembly is arranged on the evaporation tower, and the demister one is connected with the evaporation tower through a switching assembly. The atomizing and spraying assembly can ensure that the desulfurization wastewater clear liquid can be uniformly atomized, the evaporation efficiency is improved, and part of the evaporated water is carried by air, so that the air becomes high-temperature saturated air. The high-temperature saturated air enters an air condenser and is cooled by circulating cooling water to become low-temperature saturated air, and condensate water is separated out and can be used for desulfurization and other process water of power plants.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, and more specifically, to a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas. Background Technology

[0002] Traditional treatment methods ("three-stage treatment") for desulfurization wastewater generated after treating flue gas from coal-fired power plants primarily rely on chemical treatment, mainly consisting of neutralization, sedimentation, flocculation, and concentration / clarification processes. However, even after this simple chemical treatment involving chemical dosing, coagulation, and sedimentation, the desulfurization wastewater still exhibits high salt content and high corrosivity, negatively impacting the environment whether directly discharged or incorporated into municipal wastewater treatment plants. Therefore, it is necessary to concentrate the desulfurization wastewater, followed by pressure filtration or evaporation to achieve zero discharge.

[0003] Conventional desulfurization wastewater treatment processes utilize the waste heat of flue gas to completely evaporate the desulfurization wastewater. The concentrated wastewater is then sprayed into the flue or bypass flue through atomizing nozzles or rotary atomizers. After atomization, the wastewater is heated and evaporated by the flue gas, causing dissolved salts to crystallize and precipitate. These crystals are then collected by the dust collector along with the dust in the flue gas. The demister inside the tower is mainly composed of corrugated blades, plates, and clamping strips, and is currently an important component inside the desulfurization tower used to remove mist from the purified gas. Although the demister's structure is adjusted to prevent clogging, it is still prone to clogging after prolonged use, reducing its demisting effect.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] In view of the problems in the related technologies, the present invention proposes a device for evaporating and concentrating desulfurization wastewater using low-temperature flue gas to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows:

[0007] A device for evaporating and concentrating desulfurization wastewater using low-temperature flue gas includes an evaporation tower and a buffer tank located on one side of the evaporation tower. The buffer tank is connected to the evaporation tower via a pipeline. A horizontally arranged demister is installed inside the evaporation tower. An atomizing spray assembly is installed below the demister and inside the evaporation tower. A desulfurization wastewater clear liquid circulation pipeline connected to the atomizing spray assembly is provided on the evaporation tower. The demister is connected to the evaporation tower via a switching assembly.

[0008] The switching assembly includes a sleeve fitted on the evaporator tower. The sleeve has a hollow structure, and the evaporator tower has a through hole at the sleeve. An installation plate is provided inside the sleeve. A connecting seat is provided at the top of the installation plate. A groove is provided at the top of the connecting seat. A fixed shaft and a fixed shaft are symmetrically arranged in the groove. A connecting rod is provided at the top of the fixed shaft. An L-shaped connecting rod is provided at the top of the connecting rod. A fixing plate is provided at one end of the L-shaped connecting rod. One side of the fixing plate extends into the evaporator tower and connects to the connecting frame inside the demister.

[0009] Preferably, the switching assembly further includes a connecting seat 2 located at the top of the fixed plate. The top of the connecting seat 2 is provided with a groove 2. The groove 2 is provided with a fixed shaft 3 and a fixed shaft 4 symmetrically arranged. The fixed shaft 3 is provided with an inclined arc-shaped rod. The other end of the arc-shaped rod is provided with a connecting rod 2 connected to the fixed shaft 1. The fixed shaft 4 is connected to one end of the L-shaped connecting rod. The L-shaped connecting rod is provided with a fixed shaft 5 connected to the connecting rod 2.

[0010] Preferably, the first connecting rod is connected to the L-shaped connecting rod via the first connecting shaft, the arc-shaped rod is connected to the second connecting rod via the second connecting shaft, and the top of the fixing plate is provided with a waterproof motor connected to the first fixing shaft.

[0011] Preferably, the sleeve is provided with a vertically arranged demister II, which is connected to the sleeve through the switching assembly, and both sides of the sleeve are provided with matching cover plates.

[0012] Preferably, the buffer box is provided with a plurality of evenly distributed filter plates, the filter plates are connected to the buffer box by a quick-release assembly, and a sealing plate is provided on one side of the buffer box.

[0013] Preferably, the quick-release assembly includes a side plate one and a side plate two located inside the buffer box. The side plates one and the side plates two are respectively provided with slots that match a plurality of filter plates on their adjacent sides. The inner wall of each slot is provided with a toothed groove, and the filter plates are provided with locking rods that match the toothed grooves on both sides.

[0014] Preferably, the quick-release assembly further includes a cavity located within the filter plate, wherein a slider one and a slider two are symmetrically arranged within the cavity, and a locking rod is provided on the side of the slider one and the slider two that are far apart from each other. A guide rod is provided laterally within the cavity that passes through the slider one and the slider two.

[0015] Preferably, a tightening wheel is provided between the first slider and the second slider and located in the cavity. The tightening wheel is connected to the cavity through a rotating shaft, and a pull rope connected to the first slider and the second slider is wound on the tightening wheel.

[0016] Preferably, both slider one and slider two are symmetrically provided with compression springs connected to the inner wall of the cavity on their opposite sides, and one end of the rotating shaft is provided with a knob extending to the outside of the filter plate.

[0017] The beneficial effects of this invention are as follows: Through the design of the atomizing spray assembly, the atomizing spray assembly ensures that the desulfurization wastewater is uniformly atomized, increasing the evaporation efficiency. After heating, the desulfurization wastewater is uniformly sprayed into the evaporation tower through the atomizing spray assembly and falls back to the bottom. Low-temperature saturated humid air enters the evaporation tower and mixes uniformly with it in the opposite direction. At the same time, some of the evaporated water is carried by the air, and the air becomes a high-temperature saturated state. The high-temperature saturated humid air enters the air condenser and is cooled again by the circulating cooling water to low-temperature saturated humid air. The condensate can be used for desulfurization and other power plant process water. The design of the cooperation between demister one and demister two and the switching assembly enables the rapid change of the position of the two demisters, thereby avoiding the blockage of the demisters inside the evaporation tower after prolonged use. This facilitates cleaning and replacement, and minimizes the impact of demister blockage on the efficiency of the desulfurization tower. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in 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.

[0019] Figure 1 This is a schematic diagram of a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to an embodiment of the present invention.

[0020] Figure 2 This is a partial cross-sectional view of an evaporation tower in a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas, according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the connecting frame in a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the switching component in a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to an embodiment of the present invention.

[0023] Figure 5This is a schematic diagram of the filter plate in a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of a quick-release component in a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to an embodiment of the present invention.

[0025] In the picture:

[0026] 1. Evaporation tower; 2. Buffer tank; 3. Pipeline; 4. Demister I; 5. Atomizing spray assembly; 6. Sleeve; 7. Through hole; 8. Mounting plate; 9. Connecting seat I; 10. Groove I; 11. Fixed shaft I; 12. Fixed shaft II; 13. Connecting rod I; 14. L-shaped connecting rod; 15. Fixing plate; 16. Connecting frame; 17. Connecting seat II; 18. Groove II; 19. Fixed shaft III; 20. Fixed shaft IV; 21. Arc rod; 22. Connecting rod II; 23. Fixed shaft V; 24. Waterproof motor; 25. Cover plate; 26. Filter plate; 27. Side plate I; 28. Side plate II; 29. ​​Slot; 30. Locking rod; 31. Cavity; 32. Slider I; 33. Slider II; 34. Guide rod; 35. Tensioning wheel; 36. Rotating shaft; 37. Pull rope; 38. Compression spring. Detailed Implementation

[0027] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] According to an embodiment of the present invention, a device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas is provided. Example 1

[0029] like Figure 1-6 As shown, the device for evaporating and concentrating desulfurization wastewater using low-temperature flue gas according to an embodiment of the present invention includes an evaporation tower 1 and a buffer tank 2 located on one side of the evaporation tower 1. The buffer tank 2 is connected to the evaporation tower 1 via a pipe 3. A horizontally arranged demister 4 is provided inside the evaporation tower 1. An atomizing spray assembly 5 is provided below the demister 4 and inside the evaporation tower 1. A desulfurization wastewater clear liquid circulation pipeline connected to the atomizing spray assembly 5 is provided on the evaporation tower 1. The demister 4 is connected to the evaporation tower 1 via a switching assembly.

[0030] The switching assembly includes a sleeve 6 fitted onto the evaporator tower 1. The sleeve 6 has a hollow structure, and the evaporator tower 1 has a through hole 7 at the sleeve 6. The sleeve 6 contains an installation plate 8. The top of the installation plate 8 has a connecting seat 9. The top of the connecting seat 9 has a groove 10. The groove 10 contains a symmetrically arranged fixing shaft 11 and a fixing shaft 12. The top of the fixing shaft 12 has an inclined connecting rod 13. The top of the connecting rod 13 has a horizontally arranged L-shaped connecting rod 14. One end of the L-shaped connecting rod 14 has a fixing plate 15. One side of the fixing plate 15 extends into the evaporator tower 1 and connects to the connecting frame 16 inside the demister 4. Example 2

[0031] like Figure 1-6 As shown, the switching assembly also includes a connecting seat 2 17 located at the top of the fixing plate 15. The top of the connecting seat 2 17 has a groove 2 18. The groove 2 18 has a symmetrically arranged fixing shaft 3 19 and fixing shaft 4 20. The fixing shaft 3 19 has an inclined arc-shaped rod 21. The other end of the arc-shaped rod 21 has a connecting rod 22 connected to the fixing shaft 11. The fixing shaft 4 20 is connected to one end of the L-shaped connecting rod 14. The L-shaped connecting rod 14 has a fixing shaft 5 23 connected to the connecting rod 22. The connecting rod 13 is connected to the L-shaped connecting rod 14 through the connecting shaft 1. The arc-shaped rod 21 is connected to the connecting rod 22 through the connecting shaft 2. The top of the fixing plate 15 has a waterproof motor 24 connected to the fixing shaft 11. Example 3

[0032] like Figure 1-6 As shown, the sleeve 6 is equipped with a vertically arranged demister II, which is connected to the sleeve 6 via the switching assembly. Both sides of the sleeve 6 are provided with matching cover plates 25. The buffer box 2 is provided with a plurality of evenly distributed filter plates 26, which are connected to the buffer box 2 via a quick-release assembly. A sealing plate is provided on one side of the buffer box 2. The quick-release assembly includes a side plate 27 and a side plate 28 located inside the buffer box 2. The side plates 27 and 28 are provided with slots 29 that match the plurality of filter plates 26 on their adjacent sides. The inner wall of the slots 29 is provided with teeth grooves on one side. The filter plates 26 are provided with locking rods 30 that match the teeth grooves on both sides. Example 4

[0033] like Figure 1-6As shown, the quick-release assembly also includes a cavity 31 located within the filter plate 26. The cavity 31 contains symmetrically arranged slider 1 32 and slider 2 33. Each slider 1 32 and slider 2 33 has a locking rod 30 on its opposite side. A guide rod 34 is transversely arranged within the cavity 31, penetrating both slider 1 32 and slider 2 33. A tightening wheel 35 is located between slider 1 32 and slider 2 33 within the cavity 31. The tightening wheel 35 is connected to the cavity 31 via a rotating shaft 36. Pull ropes 37, respectively connected to slider 1 32 and slider 2 33, are wound around the tightening wheel 35. Compression springs 38, connected to the inner wall of the cavity 31, are symmetrically arranged on the opposite side of slider 1 32 and slider 2 33. One end of the rotating shaft 36 has a knob extending outside the filter plate 26.

[0034] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0035] In practical applications, the atomizing spray assembly 5 ensures uniform atomization of the desulfurization wastewater, increasing evaporation efficiency. After heating, the desulfurization wastewater is evenly sprayed into the evaporation tower through the atomizing spray assembly and falls back to the bottom. Low-temperature saturated humid air enters the evaporation tower and mixes uniformly with it in the opposite direction. At the same time, some of the evaporated water is carried by the air, which becomes high-temperature saturated. The high-temperature saturated humid air enters the air condenser and is recooled by circulating cooling water to low-temperature saturated humid air. The condensate can be used for desulfurization and other power plant process water. After the demister 4 has been used for a period of time, the waterproof motor 24 is started to drive the fixed shaft 11 to rotate. The fixed shaft 11 drives the arc rod 21 to move clockwise through the connecting rod 22. At the same time, the arc rod 21 drives the connecting frame 16 to rotate clockwise through the fixed plate 15. The connecting rod 13 and the L-shaped connecting rod 14 guide the fixed plate 15, so that the demister 4... 4. Enter the sleeve 6, then start another waterproof motor 24, which drives the fixed shaft 11 of another switching component to rotate counterclockwise. This allows the second demister to extend from the sleeve 6 into the evaporation tower 1, enabling a rapid change in the position of the two demisters. This helps to prevent clogging of the demisters inside the evaporation tower after prolonged use, facilitating cleaning and replacement. When the filter plate 26 needs cleaning after prolonged use, open the sealing plate and turn the knob. The knob drives the tightening wheel 35 to rotate via the rotating shaft 36. This causes the tightening wheel 35 to pull the rope 37, moving the slider 1 32 and slider 2 33 towards the center. This causes the slider 1 32 and slider 2 33 to retract the locking rod 30 and separate it from the groove in the slot 29, thus removing the filter plate 26. Then, each filter plate 26 can be pulled out for cleaning and replacement. This is used to filter impurities in the water, preventing impurities from clogging the pipes.

[0036] In summary, by utilizing the above-mentioned technical solution of the present invention, the atomizing spray assembly 5 ensures that the desulfurization wastewater is uniformly atomized, increasing evaporation efficiency. After heating, the desulfurization wastewater is uniformly sprayed into the evaporation tower through the atomizing spray assembly and falls back to the bottom. Low-temperature saturated humid air enters the evaporation tower and mixes uniformly with it in the opposite direction. At the same time, some of the evaporated water is carried by the air, and the air becomes high-temperature saturated. The high-temperature saturated humid air enters the air condenser and is recooled by the circulating cooling water into low-temperature saturated humid air. The condensate can be used for desulfurization and other power plant process water. The design of the cooperation between the demister 1 4 and the demister 2 and the switching assembly enables the rapid change of the position of the two demisters, thereby minimizing the risk of clogging of the demisters inside the evaporation tower after prolonged use. This facilitates cleaning and replacement, and minimizes the impact of demister clogging on the efficiency of the desulfurization tower.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 device for evaporating and concentrating desulfurization wastewater using low-temperature flue gas, comprising an evaporation tower (1) and a buffer tank (2) located on one side of the evaporation tower (1), characterized in that, The buffer tank (2) is connected to the evaporation tower (1) through the pipe (3). The evaporation tower (1) is equipped with a horizontally arranged demister (4). Below the demister (4) and inside the evaporation tower (1) is an atomizing spray assembly (5). The evaporation tower (1) is equipped with a desulfurization wastewater clear liquid circulation pipeline connected to the atomizing spray assembly (5). The demister (4) is connected to the evaporation tower (1) through a switching assembly. The switching assembly includes a sleeve (6) fitted on the evaporator (1). The sleeve (6) has a cavity structure, and the evaporator (1) has a through hole (7) at the sleeve (6). The sleeve (6) has an installation plate (8). The top of the installation plate (8) has a connecting seat (9). The top of the connecting seat (9) has a groove (10). The groove (10) has a fixed shaft (11) and a fixed shaft (12) arranged symmetrically. The top of the fixed shaft (12) has a connecting rod (13) arranged at an inclination. The top of the connecting rod (13) has an L-shaped connecting rod (14) arranged laterally. One end of the L-shaped connecting rod (14) has a fixing plate (15). One side of the fixing plate (15) extends into the evaporator (1) and connects to the connecting frame (16) in the demister (4). The switching assembly also includes a connecting seat two (17) located at the top of the fixed plate (15). The top of the connecting seat two (17) is provided with a groove two (18). The groove two (18) is provided with a fixed shaft three (19) and a fixed shaft four (20) arranged symmetrically. The fixed shaft three (19) is provided with an inclined arc rod (21). The other end of the arc rod (21) is provided with a connecting rod two (22) connected to the fixed shaft one (11). The fixed shaft four (20) is connected to one end of the L-shaped connecting rod (14). The L-shaped connecting rod (14) is provided with a fixed shaft five (23) connected to the connecting rod two (22). The first connecting rod (13) is connected to the L-shaped connecting rod (14) through the first connecting shaft, the arc rod (21) is connected to the second connecting rod (22) through the second connecting shaft, and the top of the fixing plate (15) is provided with a waterproof motor (24) connected to the first fixing shaft (11). The sleeve (6) is provided with a vertically arranged demister II. The demister II is connected to the sleeve (6) through the switching component. Both sides of the sleeve (6) are provided with matching cover plates (25).

2. The device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to claim 1, characterized in that, The buffer box (2) is provided with several uniformly distributed filter plates (26). The filter plates (26) are connected to the buffer box (2) through quick-release components. A sealing plate is provided on one side of the buffer box (2).

3. The device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to claim 2, characterized in that, The quick-release assembly includes a side plate 1 (27) and a side plate 2 (28) located inside the buffer box (2). The side plates 1 (27) and 2 (28) are provided with slots (29) that match a plurality of filter plates (26) on their adjacent sides. The inner wall of the slots (29) is provided with toothed grooves, and the filter plates (26) are provided with locking rods (30) that match the toothed grooves on both sides.

4. The device for evaporating and concentrating desulfurization wastewater using low-temperature flue gas according to claim 3, characterized in that, The quick-release assembly also includes a cavity (31) located in the filter plate (26). The cavity (31) is provided with a symmetrically arranged slider one (32) and slider two (33). The slider one (32) and slider two (33) are provided with a locking rod (30) on the side away from each other. The cavity (31) is provided with a guide rod (34) that passes through the slider one (32) and slider two (33) laterally.

5. The device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to claim 4, characterized in that, A tightening wheel (35) is provided between the first slider (32) and the second slider (33) and located in the cavity (31). The tightening wheel (35) is connected to the cavity (31) through a rotating shaft (36). A pull rope (37) connected to the first slider (32) and the second slider (33) is wound on the tightening wheel (35).

6. The device for evaporating and concentrating desulfurized wastewater using low-temperature flue gas according to claim 5, characterized in that, The slider one (32) and the slider two (33) are symmetrically provided with compression springs (38) connected to the inner wall of the cavity (31) on the side away from each other, and one end of the rotating shaft (36) is provided with a knob extending to the outside of the filter plate (26).

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