Wet desulphurization secondary water system
By designing a wet desulfurization secondary water system, solid-liquid separation of gypsum slurry and water recycling are realized, and the problems of excessive consumption of new water and blockage of defog desulfurization system in the vertical furnace desulfurization system are solved, ensuring the stable operation and environmentally friendly emissions of the system.
Patent Information
- Application Number
- CN202422244982.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-13
AI Technical Summary
In the vertical furnace desulfurization system, the desulfurization water system is unbalanced, resulting in excessive consumption of fresh water and the defogging defogging frequency is too low, which is prone to blockage, and there is a risk of environmentally friendly emissions not meeting the standards.
A wet desulfurization secondary water system is designed. Through the combination of gypsum pump, dehydration components, filtrate tank, slurry tank, main water pipe, vacuum pump and water storage tank, solid-liquid separation of gypsum slurry and water recycling, and the water storage tank is replenished by using the vacuum pump cooling water to ensure the normal flushing of the defog degasser.
It reduces the consumption of new water, avoids environmental pollution accidents caused by excessive desulfurization liquid level, reduces operating costs, and ensures the normal operation of the defog degasser.
Smart Images
Figure CN223127733U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wet desulfurization, in particular to a secondary water use system for wet desulfurization. Background Art
[0002] After the vertical shaft desulfurization was built and put into operation in July 2023, due to the process requirements of the vertical shaft, the temperature of the flue gas in the vertical shaft is relatively low, and the average temperature of the flue gas at the inlet of the desulfurization tower is below 70°C, which cannot meet the operating standard of the wet desulfurization flue gas temperature of 70-170°C. As a result, the desulfurization water use system is unbalanced, the liquid level is relatively high during the operation of the desulfurization tower, the desulfurization slurry is stored in the accident pool, and there is an environmental risk of wastewater discharge.
[0003] Based on the existing desulfurization data and the design calculation book of the wet desulfurization process, it is calculated that the amount of fresh water used for desulfurization per hour is about 16.8 tons. If the measure of reducing the flushing frequency of the demister is taken to reduce the use of fresh water, it will cause the demister to be blocked due to too low flushing frequency, and the phenomenon of gypsum rain will appear at the desulfurization discharge port, resulting in non-compliance of environmental protection emissions and environmental pollution. Therefore, a desulfurization system that can both reduce fresh water consumption and ensure the flushing frequency of the demister is needed. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a secondary water use system for wet desulfurization to solve the problem that excessive fresh water consumption is caused by too high flushing frequency of the demister, and blocking of the demister will be caused by reducing the flushing frequency.
[0005] To achieve the above purpose, the basic scheme provided by the utility model is: a secondary water use system for wet desulfurization, including a desulfurization tower, a gypsum pump, a dehydration component, a filtrate tank, a pulping tank, a main water pipe, a vacuum pump and a water storage tank. The desulfurization tower is connected to the gypsum pump, and a pipe 1 is connected to the gypsum pump. The gypsum pump and the dehydration component are connected through pipe 1. A filtrate pipe 1 and a filtrate pipe 2 are communicated with the filtrate tank. The filtrate tank and the dehydration component are connected through filtrate pipe 1. The filtrate tank and the pulping tank are connected through filtrate pipe 2. A slurry pipe is communicated with the pulping tank. The pulping pipe and the desulfurization tower are communicated through the slurry pipe. A fresh water pipe 1 and a fresh water pipe 2 are communicated with the main water pipe. A vacuum pump is provided on fresh water pipe 1, and a fresh water make-up valve 1 is provided on fresh water pipe 1. A cooling water pipe is communicated with the vacuum pump. The vacuum pump and the water storage tank are connected through the cooling water pipe. The free end of fresh water pipe 2 is communicated with the pulping tank. A pulping make-up valve is provided on fresh water pipe 2. A fresh water make-up pipe is communicated with fresh water pipe 2. The free end of the fresh water make-up pipe is communicated with the water storage tank. A fresh water make-up valve 2 is provided on the fresh water make-up pipe. A pipe 2 is communicated with the water storage tank. The free end of pipe 2 is communicated with the desulfurization tower.
[0006] The working principle of the present utility model is as follows: The desulfurization tower transports the gypsum slurry to the dehydration assembly through the gypsum pump. The gypsum slurry is separated into solid and liquid by the dehydration assembly. The gypsum solids are discharged to a unified collection place, and the gypsum filtrate flows into the filtrate tank through the filtrate pipe 1. The fresh water from the main water pipe replenishes water for the filtrate tank through the fresh water pipe 1. The filtrate in the filtrate tank then enters the pulping tank through the filtrate pipe 2, and the fresh water replenishes water for the pulping tank through the fresh water pipe 2. Limestone powder is input into the pulping tank and reacts with the filtrate to generate limestone slurry, which is then input into the desulfurization tower through the slurry pipe. The cooling water in the vacuum pump enters the water storage tank through the cooling water pipe, and the fresh water from the fresh water pipe 2 enters the water storage tank through the fresh water replenishing pipe. The fresh water in the water storage tank enters the desulfurization tower through the pipe 2 for demister flushing.
[0007] The beneficial effects of the present utility model are as follows: During the desulfurization operation, the water consumption of the desulfurization tower itself is relatively small. The two fresh water pipes are used to replenish water for the filtrate tank, the pulping tank, and the water storage tank simultaneously. The cooling water in the vacuum pump enters the water storage tank for storage, achieving the secondary utilization of water and liquid. In this process, the usage of fresh water is reduced, the water consumption is decreased, the operation cost is lowered, and at the same time, environmental pollution accidents caused by too high desulfurization liquid level are avoided.
[0008] Solution two, which is the optimization of the basic solution. Liquid level sensors are respectively provided on the filtrate tank, the pulping tank, and the water storage tank. The liquid levels in the filtrate tank, the pulping tank, and the water storage tank are monitored through the liquid level sensors to prevent the liquid levels from being too high or too low.
[0009] Solution three, which is the optimization of the basic solution. A filtrate pump is provided on the filtrate pipe 2. Adding a filtrate pump can effectively remove the air generated in the filtrate in the filtrate tank and then input the filtrate after exhausting air into the pulping tank.
[0010] Solution four, which is the optimization of solution two. The dehydration assembly includes a hydrocyclone and a vacuum belt filter. The hydrocyclone is above the vacuum belt filter, and the vacuum belt filter is connected to the filtrate pipe 1. The gypsum slurry is subjected to the first solid-liquid separation by the hydrocyclone and then the second solid-liquid separation by the vacuum belt filter, enabling the effective separation of the gypsum solids and the gypsum filtrate.
[0011] Solution five, which is the optimization of solution four. A filtrate water replenishing valve is provided on the filtrate pipe 2. The filtrate water replenishing valve can be opened when needed to input filtrate water into the pulping tank, and closed when water replenishment is not required to notify the input of filtrate water into the pulping tank.
[0012] Solution six, which is the optimization of solution five. A cooling water replenishing valve is provided on the cooling water pipe. When there is enough water flow in the water storage tank, the cooling water replenishing valve is closed to interrupt the water supply to the water storage tank.
[0013] Solution VI, which is the preferred solution VI. The fresh water make-up valve I, the pulping make-up valve, the fresh water make-up valve II, the filtrate make-up valve and the cooling water make-up valve are all solenoid valves. The hydrocyclone, the vacuum belt filter, the fresh water make-up valve I, the pulping make-up valve, the fresh water make-up valve II, the filtrate make-up valve and the cooling water make-up valve are all electrically connected to the PLC control terminal. By remotely controlling each valve through the PLC control system, the working efficiency and flexibility can be improved, the workload of personnel can be reduced, and the operation stability of the equipment can be enhanced. Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of a secondary water use system for wet flue gas desulfurization of the present utility model. Detailed Description of the Preferred Embodiments
[0015] The present utility model will be further described in detail below through specific embodiments:
[0016] The reference numerals in the accompanying drawings of the specification include: 1. desulfurization tower, 2. gypsum pump, 3. hydrocyclone, 4. filtrate tank, 5. pulping tank, 6. main water pipe, 7. vacuum pump, 8. water storage tank, 9. pipe I, 10. filtrate pipe I, 11. filtrate pipe II, 12. slurry pipe, 13. fresh water pipe I, 14. fresh water pipe II, 15. vacuum belt filter, 16. fresh water make-up valve I, 17. cooling water pipe, 18. pulping make-up valve, 19. fresh water make-up pipe, 20. fresh water make-up valve II, 21. pipe II, 22. demister washing pump, 23. liquid level sensor, 24. filtrate pump, 25. filtrate make-up valve, 26. cooling water make-up valve.
[0017] Embodiment
[0018] The embodiment is basically as Figure 1As shown in the figure: A secondary water - using system for wet desulfurization includes a desulfurization tower 1, a gypsum pump 2, a dehydration assembly, a filtrate tank 4, a pulping tank 5, a main water pipe 6, a vacuum pump 7, and a water storage tank 8. Liquid - level sensors 23 are respectively provided on the filtrate tank 4, the pulping tank 5, and the water storage tank 8. The desulfurization tower 1 is connected to the gypsum pump 2, and a pipeline 9 is connected to the gypsum pump 2. The gypsum pump 2 and the dehydration assembly are connected through the pipeline 9. A filtrate pipe 10 and a filtrate pipe 11 are communicated with the filtrate tank 4. The filtrate tank 4 and the dehydration assembly are connected through the filtrate pipe 10. The dehydration assembly includes a hydrocyclone 3 and a vacuum belt filter 15. The hydrocyclone 3 is located above the vacuum belt filter 15. The vacuum belt filter 15 is connected to the filtrate pipe 10. The filtrate tank 4 and the pulping tank 5 are connected through the filtrate pipe 11. A filtrate pump 24 and a filtrate water - replenishing valve 25 are provided on the filtrate pipe 11. A slurry pipe 12 is communicated with the pulping tank 5. The pulping tank 5 and the desulfurization tower 1 are communicated through the slurry pipe 12. A new water pipe 13 and a new water pipe 14 are communicated with the main water pipe 6. The vacuum pump 7 is provided on the new water pipe 13. A new water - replenishing valve 16 is provided on the new water pipe 13. The free end of the new water pipe 13 is communicated with the filtrate tank 4. A cooling water pipe 17 is communicated with the vacuum pump 7. The vacuum pump 7 and the water storage tank 8 are connected through the cooling water pipe 17. A cooling water - replenishing valve 26 is provided on the cooling water pipe 17. The free end of the new water pipe 14 is communicated with the pulping tank 5. A pulping water - replenishing valve 18 is provided on the new water pipe 14. A new water - replenishing pipe 19 is communicated with the new water pipe 14. The free end of the new water - replenishing pipe 19 is communicated with the water storage tank 8. A new water - replenishing valve 20 is provided on the new water - replenishing pipe 19. A pipeline 21 is communicated with the water storage tank 8. A demister flushing pump 22 is provided on the pipeline 21. The free end of the pipeline 21 is communicated with the desulfurization tower 1. The new water - replenishing valve 16, the pulping water - replenishing valve 18, the new water - replenishing valve 20, the filtrate water - replenishing valve 25, and the cooling water - replenishing valve 26 are all solenoid valves. The hydrocyclone 3, the vacuum belt filter 15, the new water - replenishing valve 16, the pulping water - replenishing valve 18, the new water - replenishing valve 20, the filtrate water - replenishing valve 25, and the cooling water - replenishing valve 26 are all electrically connected to the PLC control terminal.
[0019] The specific implementation process of this embodiment is as follows:
[0020] When the desulfurization tower 1 is operating, first, the operator starts the gypsum pump 2 to transfer the gypsum slurry to the hydrocyclone 3 for primary cyclone dewatering. Then the slurry reaches the vacuum belt filter 15. After secondary dewatering by the vacuum belt filter 15, gypsum and filtrate are separated. Then the filtrate flows through the first filtrate pipe 10 to the filtrate tank 4 for storage. The liquid level sensor 23 monitors whether the height of the filtrate in the filtrate tank 4 is appropriate. If the liquid level in the filtrate tank 4 is insufficient, the first fresh water make-up valve 16 is opened to replenish water to the filtrate tank 4. After the liquid level is appropriate, the filtrate make-up valve 25 is opened to start the filtrate pump 24 to pump the filtrate into the pulping tank 5 to prepare limestone slurry using the filtrate water. At this time, the liquid level sensor 24 monitors the liquid level in the pulping tank 5. If the water in the pulping tank 5 is insufficient, the pulping make-up valve 18 is opened to replenish water to the pulping tank 5.
[0021] When flushing the demister, first, the vacuum pump 7 is turned on, the first fresh water make-up valve 16 is closed, the cooling water make-up valve 26 and the second fresh water make-up valve 20 are opened. The cooling water in the vacuum pump 7 enters the water storage tank 8 through the cooling water pipe 17 to replenish water to the water storage tank 8. The water in the water storage tank 8 then enters the desulfurization tower 1 through the demister flushing pump 22 to flush the demister.
[0022] The above are only the embodiments of the present invention. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.
Claims
1. A secondary water use system for wet desulfurization, characterized in that, It includes a desulfurization tower (1), a gypsum pump (2), a dehydration assembly, a filtrate tank (4), a pulping tank (5), a main water pipe (6) and a water storage tank (8). The desulfurization tower (1) is connected to the gypsum pump (2). A pipe one (9) is connected to the gypsum pump (2). The gypsum pump (2) is connected to the dehydration assembly through the pipe one (9). A filtrate pipe one (10) and a filtrate pipe two (11) are communicated with the filtrate tank (4). The filtrate tank (4) and the dehydration assembly are connected through the filtrate pipe one (10). The filtrate tank (4) and the pulping tank (5) are connected through the filtrate pipe two (11). A slurry pipe (12) is communicated with the pulping tank (5). The pulping tank (5) is communicated with the desulfurization tower (1) through the slurry pipe (12). A new water pipe one (13) and a new water pipe two (14) are communicated with the main water pipe (6). A vacuum pump (7) is provided on the new water pipe one (13). A new water make-up valve one (16) is provided on the new water pipe one (13). The free end of the new water pipe one (13) is communicated with the filtrate tank (4). A cooling water pipe (17) is communicated with the vacuum pump (7). The vacuum pump (7) and the water storage tank (8) are connected through the cooling water pipe (17). The free end of the new water pipe two (14) is communicated with the pulping tank (5). A pulping make-up valve (18) is provided on the new water pipe two (14). A new water make-up water pipe (19) is communicated with the new water pipe two (14). The free end of the new water make-up water pipe (19) is communicated with the water storage tank (8). A new water make-up valve two (20) is provided on the new water make-up water pipe (19). A pipe two (21) is communicated with the water storage tank (8). An entrainer washing pump (22) is provided on the pipe two (21). The free end of the pipe two (21) is communicated with the desulfurization tower (1).
2. The secondary water use system for wet desulfurization according to claim 1, characterized in that Liquid level sensors (23) are respectively provided on the filtrate tank (4), the pulping tank (5) and the water storage tank (8).
3. The secondary water use system for wet desulfurization according to claim 1, characterized in that, A filtrate pump (24) is provided on the filtrate pipe two (11).
4. The secondary water use system for wet desulfurization according to claim 2, characterized in that, The dehydration assembly includes a hydrocyclone (3) and a vacuum belt filter (15). The hydrocyclone (3) is located above the vacuum belt filter (15). The vacuum belt filter (15) is connected to the filtrate pipe one (10).
5. The secondary water use system for wet desulfurization according to claim 4, characterized in that, A filtrate make-up valve (25) is provided on the filtrate pipe two (11).
6. The secondary water use system for wet desulfurization according to claim 5, characterized in that, A cooling water make-up valve (26) is provided on the cooling water pipe (17).
7. A secondary water use system for wet desulfurization according to claim 6, characterized in that, The new water make-up valve one (16), the pulping make-up valve (18), the new water make-up valve two (20), the filtrate make-up valve (25) and the cooling water make-up valve (26) are all solenoid valves. The hydrocyclone (3), the vacuum belt filter (15), the new water make-up valve one (16), the pulping make-up valve (18), the new water make-up valve two (20), the filtrate make-up valve (25) and the cooling water make-up valve (26) are all electrically connected to the PLC control terminal.