A desulfurization slurry supply pipeline flushing water recovery distribution control system and method

Abstract

The present application relates to a kind of desulfurization slurry supply pipeline flushing water recovery distribution control system and method, it is related to flushing water recovery technical field, it includes drain ditch, the drain ditch is connected and is communicated with drain pipe, the drain pipe is connected and is communicated with first water supplement pipe, second water supplement pipe and third water supplement pipe away from drain ditch one end, first electric butterfly valve is arranged on the first water supplement pipe, second electric butterfly valve is arranged on the second water supplement pipe, third electric butterfly valve is arranged on the third water supplement pipe, first desulfurization tower is connected and is communicated with the first water supplement pipe away from drain pipe one end, second desulfurization tower is connected and is communicated with the second water supplement pipe away from drain pipe one end, accident slurry tank is connected and is communicated with the third water supplement pipe away from drain pipe one end.This application is convenient to recover desulfurization slurry supply pipeline flushing water, reduces the waste condition of slurry raw material.

Description

Technical Field

[0001] This invention relates to the field of flushing water recycling technology, and in particular to a control system and method for the recycling and distribution of flushing water in desulfurization slurry supply pipelines. Background Technology

[0002] Wet flue gas desulfurization systems are currently the most widely used process route in industrial flue gas treatment. Among them, the slurry supply system, as the core transportation link of the desulfurization reaction, undertakes the key function of transporting desulfurization media such as limestone slurry and gypsum slurry to the absorption zone of the desulfurization tower.

[0003] Because desulfurization slurry has high solids content, is easy to crystallize, and is easy to deposit and solidify, when the slurry supply system is shut down, under maintenance, switching operation, or in a long-term standby state, a large amount of slurry will adhere to and remain on the inner wall of the pipeline. If it is not flushed with process water or clean water in time, the slurry will quickly deposit and harden at pipe bends, diameter changes, valves, pump inlets and outlets, etc., eventually causing the entire pipeline to be blocked, making the system unable to be put into operation. In severe cases, the pipeline needs to be cut and dredged, which greatly increases the equipment maintenance cost, labor cost, and unplanned downtime losses.

[0004] Currently, flushing water from desulfurization slurry supply pipelines is typically mixed directly with residual slurry before being discharged into ditches, where it flows by gravity into the plant's drainage system. However, this mixture still possesses a certain degree of desulfurization reactivity and utilization value, and direct discharge would result in a waste of slurry raw materials. Summary of the Invention

[0005] To facilitate the recycling of flushing water from desulfurization slurry supply pipelines and reduce waste of slurry raw materials, this application provides a control system and method for the recycling and distribution of flushing water from desulfurization slurry supply pipelines.

[0006] The desulfurization slurry supply pipeline flushing water recovery and distribution control system provided in this application adopts the following technical solution: A desulfurization slurry supply pipeline flushing water recovery and distribution control system includes a drainage ditch, a drainage pipe connected to the drainage ditch, and a first water supply pipe, a second water supply pipe, and a third water supply pipe connected to the end of the drainage pipe away from the drainage ditch. A first electric butterfly valve is installed on the first water supply pipe, a second electric butterfly valve is installed on the second water supply pipe, and a third electric butterfly valve is installed on the third water supply pipe. A first desulfurization tower is connected to the end of the first water supply pipe away from the drainage pipe, a second desulfurization tower is connected to the end of the second water supply pipe away from the drainage pipe, and an emergency slurry tank is connected to the end of the third water supply pipe away from the drainage pipe.

[0007] By adopting the above technical solution, the flushed water-slurry mixture flows into the drainage ditch through the underground drainage channel, and the liquid levels of the drainage ditch, the first desulfurization tower, and the second desulfurization tower are collected in real time; when the liquid level of the drainage ditch is lower than... At that time, neither the first nor the second desulfurization tower needs to be replenished with water; when the liquid level in the drainage ditch is at... During this period, add water to both the first and second desulfurization towers until... Between; when the water level in the drainage ditch is higher than If the liquid level in both the first and second desulfurization towers is lower than... At that time, the slurry in the drainage ditch is transported to the first desulfurization tower until the liquid level in the first desulfurization tower is higher than the required level. Then add water to the second desulfurization tower until the liquid level in the drainage ditch drops to [a certain level]. If the liquid level in both the first and second desulfurization towers is high enough... The slurry in the drainage ditch is transported to the emergency slurry tank until the slurry level in the drainage ditch drops to a minimum. The flushing water and residual slurry are transported back to the desulfurization tower to participate in the reaction, which facilitates the recovery of flushing water from the desulfurization slurry supply pipeline, realizes material recovery and water conservation, and reduces the waste of slurry raw materials.

[0008] Preferably, a plurality of drainage level gauges are provided on the drainage ditch, and the drainage level gauges are uniformly arrayed around the circumference of the drainage ditch; a plurality of first desulfurization level gauges are provided on the first desulfurization tower, and the first desulfurization level gauges are uniformly arrayed around the circumference of the first desulfurization tower; and a plurality of second desulfurization level gauges are provided on the second desulfurization tower, and the second desulfurization level gauges are uniformly arrayed around the circumference of the second desulfurization tower.

[0009] By adopting the above technical solution, the drainage level gauge detects the liquid level in the drainage ditch, the first desulfurization level gauge detects the liquid level in the first desulfurization tower, and the second desulfurization level gauge detects the liquid level in the second desulfurization tower. The drainage level gauge, the first desulfurization level gauge, and the second desulfurization level gauge are all redundantly set, which improves the accuracy of detecting the liquid level in the drainage ditch, the first desulfurization tower, and the second desulfurization tower.

[0010] Preferably, a first drainage pump is installed on the drainage ditch, with the input end of the first drainage pump connected to the drainage ditch and the output end of the first drainage pump connected to the end of the drainage pipe near the drainage ditch.

[0011] Preferably, a second drainage pump is installed on the drainage ditch, with the input end of the second drainage pump connected to the drainage ditch and the output end of the second drainage pump connected to the end of the drainage pipe near the drainage ditch.

[0012] By adopting the above technical solution, the first drainage pump and the second drainage pump adopt a one-in-one standby control mode. Under normal working conditions, one pump operates at a time. When one of the drainage pumps experiences abnormal conditions such as overload, overcurrent, power failure, or shutdown, the other drainage pump is put into operation, which facilitates continuous operation of the system.

[0013] Preferably, a submersible mixer is installed inside the drainage ditch.

[0014] By adopting the above technical solution, the submersible mixer continuously agitates the mixed slurry in the drainage ditch, reducing the settling and caking of solid particles in the drainage ditch, and making it easier for the mixed slurry in the drainage ditch to maintain fluidity.

[0015] The desulfurization slurry supply pipeline flushing water recovery and distribution control method provided in this application adopts the following technical solution: A method for controlling the recovery and distribution of flushing water in a desulfurization slurry supply pipeline includes the following steps: real-time acquisition of the liquid level in the drainage ditch, the liquid level in the first desulfurization tower, and the liquid level in the second desulfurization tower; when the liquid level in the drainage ditch is lower than... At that time, neither the first nor the second desulfurization tower needs to be replenished with water; when the liquid level in the drainage ditch is at... During this period, both the first and second desulfurization towers are replenished with water using the first control step; when the liquid level in the drainage ditch is higher than... At that time, both the first and second desulfurization towers were replenished with water using the second control step.

[0016] Preferably, the first control step includes the following steps: when the liquid level in the first desulfurization tower is lower than... And the liquid level in the second desulfurization tower is higher than At this time, the second desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the first desulfurization tower. The first desulfurization tower then replenishes water until the liquid level in the first desulfurization tower is higher than the required level. The first desulfurization tower stops making water; when the liquid level in the second desulfurization tower is lower than... And the liquid level in the first desulfurization tower is higher than At this time, the first desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the second desulfurization tower, which then replenishes water until the liquid level in the second desulfurization tower is higher than that in the first tower. The second desulfurization tower stops making water; when the liquid levels in both the first and second desulfurization towers are below [a certain value], [the water level will be lower than the required level]. At that time, the slurry in the drainage ditch is transported to the first desulfurization tower and the second desulfurization tower, and the first desulfurization tower and the second desulfurization tower are replenished with water in sequence according to priority.

[0017] Preferably, the second control step includes the following steps: when the liquid level of the first desulfurization tower and the liquid level of the second desulfurization tower are both lower than... At that time, the slurry in the drainage ditch is transported to the first desulfurization tower until the liquid level in the first desulfurization tower is higher than the required level. Then add water to the second desulfurization tower until the liquid level in the drainage ditch drops to [a certain level]. Subsequently, the slurry in the drainage ditch stopped being transported to the emergency slurry tank; when the liquid levels in both the first and second desulfurization towers reached... The slurry in the drainage ditch is transported to the emergency slurry tank until the slurry level in the drainage ditch drops to a minimum. Afterwards, the slurry in the drainage ditch stopped being transported to the slurry tank in the accident.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up drainage ditches, drainage pipes, first water supply pipes, second water supply pipes, third water supply pipes, first electric butterfly valves, second electric butterfly valves, third electric butterfly valves, first desulfurization towers, second desulfurization towers, and emergency slurry tanks, the flushing water and residual slurry are transported back to the desulfurization towers to participate in the reaction. This facilitates the recovery of flushing water from the desulfurization slurry supply pipeline, achieving the effects of material recovery and water conservation, and reducing the waste of slurry raw materials. 2. Redundant installation of the drainage level gauge, the first desulfurization level gauge, and the second desulfurization level gauge improves the accuracy of drainage ditch level, first desulfurization tower level, and second desulfurization tower level detection; 3. The first and second drainage pumps adopt a one-in-one standby control mode. Under normal operating conditions, one pump operates at a time. When one of the drainage pumps experiences an abnormal state such as overload, overcurrent, power failure, or shutdown, the other drainage pump is put into operation to facilitate continuous system operation. 4. The submersible mixer continuously agitates the mixed slurry in the drainage ditch, reducing the settling and caking of solid particles in the drainage ditch, and making it easier for the mixed slurry in the drainage ditch to maintain its fluidity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a desulfurization slurry supply pipeline flushing water recovery and distribution control system according to an embodiment of this application.

[0020] Figure 2 This is a flowchart of a desulfurization slurry supply pipeline flushing water recovery and distribution control method in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Drainage ditch; 11. First drainage pump; 12. Second drainage pump; 13. Drainage level gauge; 14. Submersible mixer; 2. Drainage pipe; 21. First water supply pipe; 211. First electric butterfly valve; 22. Second water supply pipe; 221. Second electric butterfly valve; 23. Third water supply pipe; 231. Third electric butterfly valve; 3. First desulfurization tower; 31. First level gauge; 4. Second desulfurization tower; 41. Second level gauge; 5. Emergency slurry tank. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0023] This application discloses a desulfurization slurry supply pipeline flushing water recovery and distribution control system. (Refer to...) Figure 1The system includes a drainage ditch 1, through which the flushed water-slurry mixture flows into the drainage ditch 1. A submersible mixer 14 is installed inside the drainage ditch 1 to continuously agitate the mixture, reducing the settling and caking of solid particles and maintaining its fluidity. A first drainage pump 11 and a second drainage pump 12 are installed on the drainage ditch 1. The input ends of both pumps 11 and 12 are connected to the drainage ditch 1, and a drainage pipe 2 is connected to both their output ends. The first and second drainage pumps operate in a one-in-one standby control mode. Under normal conditions, one pump operates; when one pump experiences overload, overcurrent, power failure, or other malfunction, the other pump is activated, ensuring continuous system operation. A first water supply pipe 21, a second water supply pipe 22, and a third water supply pipe 23 are connected to the end of the drain pipe 2 furthest from the drain ditch 1. A first electric butterfly valve 211 is installed on the first water supply pipe 21, a second electric butterfly valve 221 is installed on the second water supply pipe 22, and a third electric butterfly valve 231 is installed on the third water supply pipe 23. A first desulfurization tower 3 is connected to the end of the first water supply pipe 21 furthest from the drain pipe 2. A second desulfurization tower 4 is connected to the end of the second water supply pipe 22 furthest from the drain pipe 2. An emergency slurry tank 5 is connected to the end of the third water supply pipe 23 furthest from the drain pipe 2. Several drainage level gauges 13 are installed on the drain ditch 1 to detect the liquid level. The drainage level gauges 13 are evenly arrayed around the circumference of the drain ditch 1, with redundancy to improve the accuracy of liquid level detection in the drain ditch 1. Several first desulfurization level gauges are installed on the first desulfurization tower 3 to detect the liquid level in the first desulfurization tower 3. The first desulfurization level gauges are evenly arrayed around the circumference of the first desulfurization tower 3, with redundant configuration to improve the accuracy of level detection in the first desulfurization tower 3. Several second desulfurization level gauges are installed on the second desulfurization tower 4 to detect the level in the second desulfurization tower 4. The second desulfurization level gauges are also evenly arrayed around the circumference of the second desulfurization tower 4, with redundant configuration to improve the accuracy of level detection in the second desulfurization tower 4. When the level in drainage ditch 1 is lower than... At that time, neither the first desulfurization tower 3 nor the second desulfurization tower 4 requires water replenishment. When the liquid level in drainage ditch 1 is at... During this period, add water to the first desulfurization tower 3 and the second desulfurization tower 4 until... Between. When the liquid level in drainage ditch 1 is higher than If the liquid level in the first desulfurization tower 3 and the liquid level in the second desulfurization tower 4 are both lower than... At that time, the slurry in drainage ditch 1 is transported to the first desulfurization tower 3 until the liquid level in the first desulfurization tower 3 is higher than the required level. Then add water to the second desulfurization tower 4 until the liquid level in the drainage ditch 1 drops to [a certain level]. If the liquid level in the first desulfurization tower 3 and the liquid level in the second desulfurization tower 4 are both high, The slurry in drainage ditch 1 is transported to the emergency slurry tank 5 until the slurry level in drainage ditch 1 drops to a certain level. The flushing water and residual slurry are then transported back to the desulfurization tower to participate in the reaction, which facilitates the recovery of flushing water from the desulfurization slurry supply pipeline, achieves material recovery and water conservation, and reduces waste of slurry raw materials.

[0024] This application discloses a method for controlling the recovery and distribution of flushing water in a desulfurization slurry supply pipeline. (Refer to...) Figure 1 and Figure 2 It includes the following steps.

[0025] Real-time data collection of the liquid levels in the drainage ditch, the first desulfurization tower, and the second desulfurization tower.

[0026] When the water level in the drainage ditch is lower than At that time, neither the first nor the second desulfurization tower needs to be replenished with water.

[0027] When the water level in the drainage ditch is During this period, both the first and second desulfurization towers are replenished with water using the first control step.

[0028] The first control step includes the following steps: when the liquid level in the first desulfurization tower is lower than... And the liquid level in the second desulfurization tower is higher than At this time, the second desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the first desulfurization tower. The first desulfurization tower then replenishes water until the liquid level in the first desulfurization tower is higher than the required level. The first desulfurization tower stops making water; when the liquid level in the second desulfurization tower is lower than... And the liquid level in the first desulfurization tower is higher than At this time, the first desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the second desulfurization tower, which then replenishes water until the liquid level in the second desulfurization tower is higher than that in the first tower. The second desulfurization tower stops making water; when the liquid levels in both the first and second desulfurization towers are below [a certain value], [the water level will be lower than the required level]. At that time, the slurry in the drainage ditch is transported to the first desulfurization tower and the second desulfurization tower, and the first desulfurization tower and the second desulfurization tower are replenished with water in sequence according to priority.

[0029] When the water level in the drainage ditch is higher than At that time, both the first and second desulfurization towers were replenished with water using the second control step.

[0030] The second control step includes the following steps: when the liquid level in the first desulfurization tower and the liquid level in the second desulfurization tower are both below... At that time, the slurry in the drainage ditch is transported to the first desulfurization tower until the liquid level in the first desulfurization tower is higher than the required level. Then add water to the second desulfurization tower until the liquid level in the drainage ditch drops to [a certain level]. Subsequently, the slurry in the drainage ditch stopped being transported to the emergency slurry tank; when the liquid levels in both the first and second desulfurization towers reached... The slurry in the drainage ditch is transported to the emergency slurry tank until the slurry level in the drainage ditch drops to a minimum. Afterwards, the slurry in the drainage ditch stopped being transported to the slurry tank in the accident.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A desulfurization slurry supply pipeline flushing water recovery and distribution control system, comprising a drainage ditch, wherein a drainage pipe is connected to the drainage ditch, characterized in that: The end of the drain pipe away from the drainage ditch is connected to a first water supply pipe, a second water supply pipe, and a third water supply pipe. A first electric butterfly valve is installed on the first water supply pipe, a second electric butterfly valve is installed on the second water supply pipe, and a third electric butterfly valve is installed on the third water supply pipe. The end of the first water supply pipe away from the drain pipe is connected to a first desulfurization tower, the end of the second water supply pipe away from the drain pipe is connected to a second desulfurization tower, and the end of the third water supply pipe away from the drain pipe is connected to an emergency slurry tank.

2. The desulfurization slurry supply pipeline flushing water recovery and distribution control system according to claim 1, characterized in that: A plurality of drainage level gauges are installed on the drainage ditch, and the drainage level gauges are uniformly arrayed around the circumference of the drainage ditch. A plurality of first desulfurization level gauges are installed on the first desulfurization tower, and the first desulfurization level gauges are uniformly arrayed around the circumference of the first desulfurization tower. A plurality of second desulfurization level gauges are installed on the second desulfurization tower, and the second desulfurization level gauges are uniformly arrayed around the circumference of the second desulfurization tower.

3. The desulfurization slurry supply pipeline flushing water recovery and distribution control system according to claim 1, characterized in that: A first drainage pump is installed on the drainage ditch. The input end of the first drainage pump is connected to the drainage ditch, and the output end of the first drainage pump is connected to the end of the drainage pipe near the drainage ditch.

4. The desulfurization slurry supply pipeline flushing water recovery and distribution control system according to claim 3, characterized in that: A second drainage pump is installed on the drainage ditch. The input end of the second drainage pump is connected to the drainage ditch, and the output end of the second drainage pump is connected to the end of the drainage pipe near the drainage ditch.

5. The desulfurization slurry supply pipeline flushing water recovery and distribution control system according to claim 1, characterized in that: A submersible mixer is installed inside the drainage ditch.

6. A method for controlling the recovery and distribution of flushing water in a desulfurization slurry supply pipeline, characterized in that: The desulfurization slurry supply pipeline flushing water recovery and distribution control system according to any one of claims 1-5 includes the following steps: real-time acquisition of the drainage ditch liquid level, the first desulfurization tower liquid level, and the second desulfurization tower liquid level; when the drainage ditch liquid level is lower than... At that time, neither the first nor the second desulfurization tower needs to be replenished with water; when the liquid level in the drainage ditch is at... During this period, both the first and second desulfurization towers are replenished with water using the first control step; when the liquid level in the drainage ditch is higher than... At that time, both the first and second desulfurization towers were replenished with water using the second control step.

7. The method for controlling the recovery and distribution of flushing water in a desulfurization slurry supply pipeline according to claim 6, characterized in that: The first control step includes the following steps: when the liquid level in the first desulfurization tower is lower than... And the liquid level in the second desulfurization tower is higher than At this time, the second desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the first desulfurization tower. The first desulfurization tower then replenishes water until the liquid level in the first desulfurization tower is higher than the required level. The first desulfurization tower stops making water; when the liquid level in the second desulfurization tower is lower than... And the liquid level in the first desulfurization tower is higher than At this time, the first desulfurization tower does not replenish water, and the slurry in the drainage ditch is transported to the second desulfurization tower, which then replenishes water until the liquid level in the second desulfurization tower is higher than that in the first tower. The second desulfurization tower stops making water; when the liquid levels in both the first and second desulfurization towers are below [a certain value], [the water level will be lower than the required level]. At that time, the slurry in the drainage ditch is transported to the first desulfurization tower and the second desulfurization tower, and the first desulfurization tower and the second desulfurization tower are replenished with water in sequence according to priority.

8. The method for controlling the recovery and distribution of flushing water in a desulfurization slurry supply pipeline according to claim 6, characterized in that: When the liquid level in the first desulfurization tower and the liquid level in the second desulfurization tower are both lower than At that time, the slurry in the drainage ditch is transported to the first desulfurization tower until the liquid level in the first desulfurization tower is higher than the required level. Then add water to the second desulfurization tower until the liquid level in the drainage ditch drops to [a certain level]. Subsequently, the slurry in the drainage ditch stopped being transported to the emergency slurry tank; when the liquid levels in both the first and second desulfurization towers reached... The slurry in the drainage ditch is transported to the emergency slurry tank until the slurry level in the drainage ditch drops to a minimum. Afterwards, the slurry in the drainage ditch stopped being transported to the slurry tank in the accident.

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