Graded washing wet flue gas desulfurization device

Abstract

The utility model relates to a wet flue gas desulfurization device capable of washing by stages, which is characterized in that a spray thrower A, a recovery component, a spray thrower B and a demister are sequentially arranged in a desulfurization tower from bottom to top, an exhaust port is arranged at the top of the desulfurization tower, a gas inlet is arranged below the spray thrower A, the gas inlet inclines downwards towards the bottom in the desulfurization tower, a pre-spray component is arranged on the gas inlet, and a spray thrower B is arranged on the spray thrower B; slurry is placed at the bottom in the desulfurization tower, the sprayer A and the pre-spraying assembly are communicated with the bottom in the desulfurization tower through a liquid conveying pipeline A. Slurry is stored in the liquid storage tank, the bottom in the liquid storage tank is communicated with the sprayer B through a liquid conveying pipeline B. The liquid conveying pipeline A and the liquid conveying pipeline B are each provided with an infusion pump. And the recovery assembly is communicated with the top in the liquid storage tank through a liquid conveying pipeline C. According to the utility model, three-stage desulfurization can be realized, two streams of slurry with different alkalinity can be respectively and circularly sprayed, and the desulfurization device has the advantages of good desulfurization effect and convenience in post gypsum production.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, specifically to a wet flue gas desulfurization device with staged washing. Background Technology

[0002] Traditional wet desulfurization technology mainly uses a washing slurry containing absorbent to circulate and wash flue gas. It usually uses a flue gas desulfurization unit to perform flue gas desulfurization. The raw flue gas containing SO2 enters the flue gas desulfurization unit, passes through a primary spray, and is then treated by a demister before being discharged. Because there is only a primary spray, the proportion of flue gas not covered by the slurry spray is relatively high, which reduces the flue gas treatment effect. In addition, the slurries used for circulating spray in traditional flue gas desulfurization units are often mixed together, resulting in similar alkalinity of the slurries. When the alkalinity of the slurry is low, the desulfurization effect is reduced. When the alkalinity of the slurry is high, it increases the difficulty of preparing gypsum products from the slurry in the later stage. It is impossible to achieve both good desulfurization effect and easy gypsum production at the same time. Utility Model Content

[0003] The purpose of this invention is to provide a wet flue gas desulfurization device with graded washing, which can achieve three-stage desulfurization and allow two streams of slurry with different alkalinities to be sprayed in separate cycles. It has the advantages of good desulfurization effect and convenient post-treatment gypsum production.

[0004] The technical solution of this utility model is as follows:

[0005] A staged wet flue gas desulfurization device includes a desulfurization tower, a storage tank, and a support platform. The desulfurization tower and the support platform are respectively located on the upper and lower sides of the support platform. Inside the desulfurization tower, from bottom to top, are arranged a sprayer A, a recovery assembly, a sprayer B, and a demister. The desulfurization tower has an exhaust port at the top and an air inlet below sprayer A. The air inlet slopes downwards towards the bottom of the desulfurization tower. A pre-spraying assembly is installed on the air inlet and is connected to a flue gas duct. The desulfurization tower contains slurry at its bottom. Sprayer A and the pre-spraying assembly are connected to the bottom of the desulfurization tower via liquid delivery pipe A. The storage tank contains slurry, and the bottom of the storage tank is connected to sprayer B via liquid delivery pipe B. Liquid delivery pipes A and B are each equipped with a pump that draws liquid upwards. The recovery assembly is connected to the top of the storage tank via liquid delivery pipe C. The alkalinity of the slurry in the storage tank is higher than that of the slurry at the bottom of the desulfurization tower.

[0006] Preferably, the pre-spraying assembly includes a connecting pipe and a liquid receiving box. The connecting pipe is straight, and its two ends are connected to an air inlet and a flue gas duct, respectively. A liquid receiving box is provided on the upper side of the connecting pipe along its length. The liquid receiving box is hollow inside. Spray heads that penetrate the connecting pipe are evenly distributed at the lower part of the liquid receiving box. A connecting pipe is provided at the upper part of the liquid receiving box, and the connecting pipe is connected to the liquid delivery pipe A.

[0007] Preferably, the recovery assembly includes a liquid receiving ring and a liquid baffle. The liquid receiving ring is located below the sprayer B inside the desulfurization tower. The liquid receiving ring is arranged along the inner wall of the desulfurization tower. A liquid delivery channel is provided inside the liquid receiving ring along its length, and the upper part of the liquid delivery channel is open. A liquid baffle is located above the liquid receiving ring. The liquid baffle is conical in shape, and its downward projection completely covers the opening surrounded by the liquid receiving ring. The bottom edge of the liquid baffle is located at the upper opening of the liquid delivery channel. A space is left between the bottom edge of the liquid baffle and the liquid receiving ring for flue gas to pass through. A space is also left between the bottom edge of the liquid baffle and the inner wall of the desulfurization tower for flue gas to pass through. The liquid delivery channel communicates with the top of the storage tank via a liquid delivery pipe C. A connecting rod connects the outer edge of the liquid baffle to the inner wall of the desulfurization tower.

[0008] Preferably, an overflow pipe is connected between the desulfurization tower and the storage tank, and the connection between the overflow pipe and the desulfurization tower is lower than the air inlet.

[0009] Preferably, the desulfurization tower has a slurry discharge port A at the bottom of its side, and a slurry replenishment port A above the slurry discharge port A.

[0010] Preferably, the bottom side of the liquid storage tank is provided with a slurry discharge port B, and the top side of the liquid storage tank is provided with a slurry replenishment port B.

[0011] Preferably, the liquid storage tank is equipped with an acid-base sensor.

[0012] Preferably, the desulfurization tower is equipped with a flushing device above the demister, and the flushing device is connected to a water supply pipe.

[0013] The beneficial technical effects of this utility model are as follows:

[0014] 1. By using the pre-spraying components, sprayer A and sprayer B in combination, the flue gas needs to undergo three stages of slurry spraying treatment before it is discharged from the desulfurization tower, which can effectively improve the flue gas desulfurization effect.

[0015] 2. By using the combination of liquid delivery pipeline A and liquid pump, the slurry sprayed from the pre-spraying components and sprayer A can be recovered from the bottom of the desulfurization tower for reuse. By using the combination of recovery components, liquid delivery pipelines B and C, and liquid pump, the slurry sprayed from sprayer B can be recovered into the storage tank for reuse. This ensures that the pre-spraying components, sprayer A, and sprayer B continuously receive the slurry required for spraying, maintaining the normal operation of the device. Furthermore, the circulation paths of the slurry at the bottom of the desulfurization tower and the slurry in the storage tank are separated, reducing mutual interference between the two slurries with different alkalinities. The slurry at the bottom of the desulfurization tower can be kept at a low alkalinity, facilitating subsequent discharge of the slurry to be made into gypsum. The slurry in the storage tank can be kept at a high alkalinity, enhancing the ability to treat sulfur-containing components in the flue gas and further improving the desulfurization effect. Attached Figure Description

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0017] Appendix Figure 1 This is the front view of the present invention.

[0018] Appendix Figure 2 This is a front-view cross-sectional view of the present invention.

[0019] Appendix Figure 3 This is a rear view of the present invention.

[0020] Appendix Figure 4 This is a top-view cross-sectional view of the interior of the desulfurization tower at the recovery component.

[0021] In the diagram: 1-Desulfurization tower, 2-Storage tank, 3-Support platform, 4-Sprayer A, 5-Sprayer B, 6-Recovery component, 7-Demister, 8-Air inlet, 9-Pre-spray component, 10-Flue gas duct, 11-Liquid delivery pipe A, 12-Liquid delivery pipe B, 13-Liquid pump, 14-Liquid delivery pipe C, 15-Connecting pipe, 16-Liquid receiving box, 17-Spray head, 18-Connecting pipe, 19-Liquid receiving ring, 20-Liquid baffle, 21-Connecting rod, 22-Overflow pipe, 23-Slurry discharge port A, 24-Slurry replenishment port A, 25-Slurry discharge port B, 26-Slurry replenishment port B, 27-Acid-alkalinity sensor, 28-Flusher, 29-Water delivery pipe, 30-Exhaust port. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Example:

[0024] like Figures 1 to 4As shown, this embodiment provides a staged washing wet flue gas desulfurization device, including a desulfurization tower 1, a storage tank 2, and a support platform 3. The desulfurization tower 1 and the support platform 3 are respectively installed on the upper and lower sides of the support platform 3. Inside the desulfurization tower 1, from bottom to top, a sprayer A4, a recovery component 6, a sprayer B5, and a demister 7 are arranged sequentially. The desulfurization tower 1 has an exhaust port 30 at the top and an air inlet 8 below the sprayer A4. The air inlet 8 slopes downwards towards the bottom of the desulfurization tower 1. A pre-spraying component 9 is installed on the air inlet 8. The pre-spraying component 9 interacts with the flue gas... Pipeline 10 is connected. Slurry is placed at the bottom of desulfurization tower 1. Sprayer A4 and pre-spraying component 9 are connected to the bottom of desulfurization tower 1 via liquid delivery pipeline A11. Slurry is stored in storage tank 2. The bottom of storage tank 2 is connected to sprayer B5 via liquid delivery pipeline B12. Liquid delivery pipelines A11 and B12 are each equipped with a liquid pump 13 that draws liquid upwards. Recovery component 6 is connected to the top of storage tank 2 via liquid delivery pipeline C14. The alkalinity of the slurry in storage tank 2 is higher than that of the slurry at the bottom of desulfurization tower 1.

[0025] By using the pre-spraying assembly 9, sprayer A4 and sprayer B5 together, the flue gas needs to undergo three stages of slurry spraying treatment before being discharged from the desulfurization tower 1, which can effectively improve the flue gas desulfurization effect. By using the combination of the liquid delivery pipeline A11 and the liquid pump 13, the slurry sprayed from the pre-spraying assembly 9 and the sprayer A4 is recovered from the bottom of the desulfurization tower 1 for reuse. By using the combination of the recovery assembly 6, the liquid delivery pipeline B12, the liquid delivery pipeline C14 and the liquid pump 13, the slurry sprayed from the sprayer B5 is recovered into the storage tank 2 for reuse. This ensures that the pre-spraying assembly 9, the sprayer A4 and the sprayer B5 continuously receive the slurry required for spraying, maintaining the normal operation of the device. Furthermore, the circulation paths of the slurry at the bottom of the desulfurization tower 1 and the slurry in the storage tank 2 are separated, which can reduce the mutual interference between the two slurries with different alkalinities. The slurry at the bottom of the desulfurization tower 1 can be kept at a low alkalinity, which is convenient for subsequent discharge of the slurry to make gypsum. The slurry in the storage tank 2 can be kept at a high alkalinity, which enhances the treatment capacity of sulfur-containing components in the flue gas and further improves the desulfurization effect.

[0026] Furthermore, the pre-spray assembly 9 includes a connecting pipe 15 and a liquid receiving box 16. The connecting pipe 15 is straight, and its two ends are connected to the air inlet 8 and the flue gas pipe 10, respectively. The liquid receiving box 16 is provided on the upper side of the connecting pipe 15 along the length direction. The liquid receiving box 16 is hollow inside. Spray heads 17 are evenly provided in the lower part of the liquid receiving box 16 and penetrate into the connecting pipe 15. The upper part of the liquid receiving box 16 is provided with a connecting pipe 18, which is connected to the liquid delivery pipe A11.

[0027] The slurry at the bottom of the desulfurization tower 1 flows along the liquid delivery pipe A11 to the connecting pipe 18 and passes through it under the action of the liquid pump 13. After entering the liquid receiving box 16, the slurry is sprayed into the connecting pipe 15 through the spray head 17. The flue gas entering the connecting pipe 15 from the flue gas pipe 10 is sprayed by the slurry to obtain the first stage of spraying. The sprayed flue gas enters the desulfurization tower 1 from the air inlet 8. The sprayed slurry flows back to the bottom of the desulfurization tower 1 along the connecting pipe 15 and the air inlet 8.

[0028] Specifically, flanges are provided at both ends of the connecting pipe 15 and the port of the connecting pipe 18. The connecting pipe 15 and the connecting pipe 18 are connected to the corresponding flue gas pipe 10, air inlet 8 and liquid delivery pipe A11 by screwing bolts into the flanges. The assembly and disassembly are simple and convenient to remove the spray assembly afterward to clean the impurities that have accumulated inside due to long-term use.

[0029] Furthermore, the recovery component 6 includes a liquid receiving ring 19 and a liquid baffle 20. The liquid receiving ring 19 is located below the sprayer B5 inside the desulfurization tower 1. The liquid receiving ring 19 is arranged along the inner wall of the desulfurization tower 1. The liquid receiving ring 19 has a liquid delivery channel along its length and the upper part of the liquid delivery channel is open. The liquid baffle 20 is located above the liquid receiving ring 19. The liquid baffle 20 is conical in shape. The projection of the liquid baffle 20 directly downward completely covers the opening surrounded by the liquid receiving ring 19. The bottom edge of the liquid baffle 20 is located at the upper opening of the liquid delivery channel. There is a space between the bottom edge of the liquid baffle 20 and the liquid receiving ring 19 for flue gas to pass through. There is also a space between the bottom edge of the liquid baffle 20 and the inner wall of the desulfurization tower 1 for flue gas to pass through. The liquid delivery channel is connected to the top of the storage tank 2 via the liquid delivery pipe C14. A connecting rod 21 connects the outer edge of the liquid baffle 20 to the inner wall of the desulfurization tower 1.

[0030] The slurry sprayed from the sprayer B5 above is blocked by the liquid baffle 20 and falls into the bottom of the desulfurization tower 1 through the middle opening of the liquid receiving ring 19. The slurry falling on the liquid baffle 20 slides down its inclined surface into the liquid receiving ring 19 connected to the bottom of the outer edge of the liquid baffle 20. The slurry falling into the liquid receiving ring 19 flows back into the storage tank 2 along its delivery channel and the delivery pipe C14 connected to the delivery channel. There is a space between the bottom of the outer edge of the liquid baffle 20 and the liquid receiving ring 19 for flue gas to pass through. There is also a space between the bottom of the outer edge of the liquid baffle 20 and the inner wall of the desulfurization tower 1 for flue gas to pass through. The upward movement of flue gas in the desulfurization tower 1 is not hindered by the liquid baffle 20 and the liquid receiving ring 19.

[0031] Furthermore, an overflow pipe 22 is connected between the desulfurization tower 1 and the storage tank 2, and the connection between the overflow pipe 22 and the desulfurization tower 1 is lower than the air inlet 8.

[0032] The overflow pipe 22 prevents excessive slurry in the desulfurization tower 1 from flooding the air inlet 8 and affecting the normal flow of flue gas into the desulfurization tower 1. Specifically, the amount of low-alkaline slurry mixed into the storage tank 2 through the overflow pipe 22 is generally limited and has little impact. However, staff should pay attention to the amount of slurry added to the bottom of the desulfurization tower 1 to avoid excessive slurry addition, which would make it difficult to maintain high alkalinity in the storage tank 2 and reduce the flue gas desulfurization effect.

[0033] Furthermore, a slurry discharge port A23 is provided on the bottom side of the desulfurization tower 1, and a slurry replenishment port A24 is provided above the slurry discharge port A23.

[0034] The slurry outlet A23 and the slurry replenishment outlet A24 facilitate the replacement and replenishment of the slurry at the bottom of the desulfurization tower 1 by the staff.

[0035] Furthermore, a slurry discharge port B25 is provided on the bottom side of the liquid storage tank 2, and a slurry replenishment port B26 is provided on the top side of the liquid storage tank 2.

[0036] The discharge port B25 and the replenishment port B26 facilitate the replacement and replenishment of slurry in storage tank 2 by staff.

[0037] Furthermore, the storage tank 2 is equipped with an acid-base sensor 27.

[0038] The acid-base sensor 27 is used to detect the alkalinity of the slurry in the storage tank 2, so that the staff can know the alkalinity of the slurry and replenish the slurry in time when the alkalinity of the slurry is lower than the required minimum value, so as to maintain the high alkalinity of the slurry in the storage tank 2.

[0039] Furthermore, a flushing device 28 is provided above the demister 7 inside the desulfurization tower 1, and the flushing device 28 is connected to a water supply pipe 29 for water supply.

[0040] The demister 7 is cleaned by a high-speed water jet from the flusher 28 to prevent it from becoming clogged and obstructing the passage of flue gas.

[0041] Working principle and usage process of this utility model:

[0042] Flue gas enters the pre-spray assembly 9 from the flue gas duct 10. The pre-spray assembly 9 receives slurry from the liquid delivery pipe A11 and sprays the slurry onto the passing flue gas. The flue gas that has passed through the first stage of spraying enters the desulfurization tower 1 from the air inlet 8. The slurry participating in the first stage of spraying flows back to the bottom of the desulfurization tower 1. Sprayer A4 receives slurry from the liquid delivery pipe A11 and sprays the slurry onto the flue gas entering from the air inlet 8. The flue gas that has passed through the second stage of spraying rises through sprayer A4 and recovery assembly 6 to below sprayer B5. The slurry participating in the second stage of spraying falls back to the bottom of the desulfurization tower 1. Sprayer B5 receives slurry from the liquid delivery pipe B12 and sprays the slurry onto the flue gas below. The slurry that has passed through the third stage of spraying continues to rise and leaves the desulfurization tower 1 from the exhaust port 30 after passing through sprayer B5 and demister 7. The slurry participating in the third stage of spraying is intercepted by recovery assembly 6 and flows back to storage tank 2 along liquid delivery pipe C14. Most of the sulfur-containing components in the flue gas remain in the slurry at the bottom of the desulfurization tower 1. Gypsum is generally prepared from the slurry at the bottom of the desulfurization tower 1.

[0043] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A wet flue gas desulfurization device with staged washing, characterized in that: The system includes a desulfurization tower, a storage tank, and a support platform. The desulfurization tower and support platform are respectively located on the upper and lower sides of the support platform. Inside the desulfurization tower, from bottom to top, are a sprayer A, a recovery assembly, a sprayer B, and a demister. The desulfurization tower has an exhaust port at the top and an air inlet below sprayer A. The air inlet slopes downwards towards the bottom of the desulfurization tower. A pre-spraying assembly is installed on the air inlet and is connected to a flue gas duct. Slurry is placed at the bottom of the desulfurization tower. Sprayer A and the pre-spraying assembly are connected to the bottom of the desulfurization tower via a liquid delivery pipe A. The storage tank contains slurry, and the bottom of the storage tank is connected to sprayer B via a liquid delivery pipe B. Each of the liquid delivery pipes A and B has an upward-drawing pump. The recovery assembly is connected to the top of the storage tank via a liquid delivery pipe C. The alkalinity of the slurry in the storage tank is higher than that of the slurry at the bottom of the desulfurization tower.

2. The wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The pre-spray assembly includes a connecting pipe and a liquid receiving box. The connecting pipe is straight, and its two ends are connected to the air inlet and the flue gas pipe, respectively. A liquid receiving box is provided on the upper side of the connecting pipe along its length. The liquid receiving box is hollow inside. Spray heads are evenly arranged in the lower part of the liquid receiving box and inserted into the connecting pipe. A connecting pipe is provided on the upper part of the liquid receiving box and is connected to the liquid delivery pipe A.

3. The wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The recovery assembly includes a liquid receiving ring and a liquid baffle. A liquid receiving ring is located below the sprayer B inside the desulfurization tower. The liquid receiving ring is arranged along the inner wall of the desulfurization tower. A liquid conveying channel is provided inside the liquid receiving ring along its length, with the upper part of the channel open. A liquid baffle is located above the liquid receiving ring. The liquid baffle is conical in shape, and its downward projection completely covers the opening surrounded by the liquid receiving ring. The bottom edge of the liquid baffle is located at the upper opening of the liquid conveying channel. A space is left between the bottom edge of the liquid baffle and the liquid receiving ring for flue gas to pass through. A space is also left between the bottom edge of the liquid baffle and the inner wall of the desulfurization tower for flue gas to pass through. The liquid conveying channel communicates with the top of the storage tank via a liquid conveying pipe C. A connecting rod connects the outer edge of the liquid baffle to the inner wall of the desulfurization tower.

4. The wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: An overflow pipe connects the desulfurization tower and the storage tank, and the connection point between the overflow pipe and the desulfurization tower is lower than the air inlet.

5. A wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The desulfurization tower has a slurry discharge port A at the bottom of its side, and a slurry replenishment port A above the slurry discharge port A.

6. The wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The storage tank has a slurry discharge port B at the bottom of its side and a slurry replenishment port B at the top of its side.

7. A wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The storage tank is equipped with an acid-base sensor.

8. A wet flue gas desulfurization device with staged washing according to claim 1, characterized in that: The desulfurization tower is equipped with a flushing device above the demister, and the flushing device is connected to a water supply pipe.

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