Desulfurizing absorption tower slurry treatment system and method

Abstract

The invention discloses a desulfurization absorption tower slurry treatment system and a desulfurization absorption tower slurry treatment method, and aims to solve the technical problems of low utilization rate of an accident slurry tank and poor fine particle separation effect of a wastewater cyclone station in an existing wet desulfurization system. On the basis of retaining the original emergency function of the accident slurry tank, the system is transformed into an integrated unit with a gravity settling function by additionally arranging a bypass pipeline, a side stirrer, a liquid level and mud level monitor and a clear liquid discharge port. When a desulfurization system normally operates, overflow slurry of a gypsum cyclone station is introduced into an accident slurry tank for full sedimentation, separated supernatant is discharged as high-quality raw wastewater, and bottom concentrated slurry is reused for an absorption tower or a gypsum dehydration system. According to the invention, the efficient utilization of idle equipment is realized, the removal capability of fine particles and chloride ions in slurry is enhanced, the quality of desulfurization wastewater and the quality of gypsum products are improved, the automatic and flexible switching of operation modes is realized through the control system, and the operation stability and economical efficiency of the whole desulfurization system are improved.

Description

Technical Field

[0001] This invention belongs to the field of flue gas desulfurization technology in coal-fired power plants, specifically relating to a desulfurization absorption tower slurry treatment system and method, which is applicable to the daily optimization treatment and disposal of absorption tower slurry in wet desulfurization processes. Background Technology

[0002] In wet flue gas desulfurization (FGD) systems, the desulfurization absorption tower is the core equipment for achieving efficient SO2 removal. However, in actual operation, the absorption tower's operating condition may deteriorate due to various factors, such as slurry circulation pump failure, nozzle blockage, pH value malfunction, insufficient oxidation airflow, or scaling of internal components. These abnormal operating conditions not only significantly reduce desulfurization efficiency but may also cause problems such as slurry foaming inside the tower, undersized gypsum crystal growth, and accumulation of fine insoluble matter like dust that cannot be discharged in a timely manner. This, in turn, affects the quality of desulfurized gypsum and the separation capacity of the wastewater hydrocyclone station, and in severe cases, may even force the system to shut down, affecting the continuous and stable operation of power plants or industrial installations.

[0003] The configuration of an emergency slurry tank is crucial for responding to such emergencies. When the absorption tower malfunctions, the slurry inside must be quickly discharged to the emergency slurry tank to prevent further deterioration of the slurry quality or equipment damage. The emergency slurry tank not only provides buffer capacity for fault handling but also temporarily stores substandard slurry, facilitating subsequent repair, replacement, or disposal. However, in actual operation, the emergency slurry tank is typically only activated for "emergency storage" and "system buffering," resulting in its long-term idle state, low utilization rate, and passive function. Its large capacity is not fully utilized for routine slurry optimization, limiting its comprehensive utilization potential. Furthermore, the wastewater hydrocyclone station has poor separation efficiency for fine particles (such as chloride ions and dust), leading to unstable desulfurization wastewater quality and affecting subsequent treatment efficiency.

[0004] Therefore, a systematic approach is urgently needed to link the emergency slurry tank with the mainstream process to improve the overall utilization rate of the equipment and the solid-liquid separation effect. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a desulfurization absorption tower slurry treatment system and method. This system links the emergency slurry tank with the gypsum dewatering system, and utilizes an intelligent control system to switch operating modes, optimizing the operation of the gypsum hydrocyclone station and wastewater hydrocyclone station. This enhances the discharge capacity of toxic substances from the slurry, improves system adjustment flexibility, and increases equipment efficiency. The invention includes a desulfurization absorption tower, a regional slurry tank, a regional slurry tank pump, an emergency slurry tank, an emergency slurry pump, a gypsum discharge pump, a gypsum hydrocyclone station, a vacuum belt conveyor, a recycled water tank, a recycled water pump, a wastewater hydrocyclone station supply tank, a wastewater hydrocyclone station supply pump, a wastewater hydrocyclone station, a desulfurization wastewater pre-sedimentation tank, a desulfurization wastewater treatment system, and a control system. Through process optimization and intelligent control, the system fully utilizes the volume of the emergency slurry tank, reducing the concentration of chloride ions and fine particles in the discharged desulfurization wastewater, and solving the problem of poor separation of fine dust particles by the wastewater hydrocyclone station.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A desulfurization absorption tower slurry treatment system includes a desulfurization absorption tower, a gypsum discharge pump, a gypsum hydrocyclone station, a vacuum belt conveyor, a recycled water tank, a wastewater hydrocyclone station supply tank, a wastewater hydrocyclone station supply pump, a wastewater hydrocyclone station, a desulfurization wastewater pre-sedimentation tank, a desulfurization wastewater treatment system, and a control system; the treatment system also includes a partially modified emergency slurry tank. The feed inlet of the gypsum hydrocyclone station is connected to the slurry discharge end of the desulfurization absorption tower through the gypsum discharge pump. Its underflow outlet is used to output gypsum slurry to the vacuum belt conveyor. Its overflow outlet is divided into two paths: the first path is connected to the recycled water tank, and the second path is connected to the wastewater hydrocyclone station supply tank. The outlet of the wastewater hydrocyclone station supply tank is connected to the wastewater hydrocyclone station through the wastewater hydrocyclone station supply pump. The wastewater cyclone station has its underflow outlet connected to the recycled water tank and its overflow outlet connected to the desulfurization wastewater pre-sedimentation tank. The emergency slurry tank, as the core settling unit, is equipped with a slurry feed pipe, a supernatant discharge pipe, a bottom stirring device, an emergency slurry pump, and a liquid level and sludge level monitoring unit. The slurry feed pipe is connected to the bypass outlet of the wastewater hydrocyclone station supply pump. The inlet of the emergency slurry pump is connected to the bottom of the emergency slurry tank, and its outlet is divided into two paths: one path is connected to the desulfurization absorption tower, and the other path is connected to the feed end of the vacuum belt conveyor. The control system is connected to the valves on the slurry feed pipe and the supernatant discharge pipe, the bottom stirring device, the bottom mud discharge pump, and the liquid level and mud level monitoring unit. It is configured to control the emergency slurry tank to automatically switch between "settling mode" and "emergency mode" according to the monitoring data, and to sequentially perform feeding, settling, drainage, and mud discharge operation cycles.

[0007] Furthermore, the slurry feed pipe is connected to the bypass outlet of the wastewater hydrocyclone station supply pump to receive the overflow slurry from the gypsum hydrocyclone station; The supernatant discharge pipe has its inlet located at a predetermined height on the inner wall of the emergency slurry tank, and its outlet connected to the inlet of the desulfurization wastewater pre-sedimentation tank. The bottom stirring device is a side stirring device installed at the bottom or lower side of the emergency slurry tank. It is used to disturb the concentrated bottom mud after settling and re-stir it evenly, so that the bottom mud can be pumped back to the desulfurization absorption tower or vacuum belt conveyor by the emergency slurry pump and mixed with the underflow of the gypsum hydrocyclone station for dewatering and gypsum preparation. The liquid level and mud level monitoring unit is used to monitor the interface height between the clear liquid and mud inside the emergency slurry tank in real time.

[0008] Furthermore, the side wall of the accident slurry tank is equipped with at least one sight glass with an internal scraper. The sight glass is set at different heights, and the installation height of the sight glass corresponds to the vicinity of the designed solid-liquid separation interface, which is used to observe the sedimentation and solid-liquid separation effect. The sight glass with an internal scraper can be manually scraped and cleaned at any time to achieve self-cleaning of the mirror surface.

[0009] Furthermore, the inlet of the supernatant discharge pipe is located on the inner wall of the emergency slurry tank at a position 0.3 meters to 1.0 meters above the designed solid-liquid separation interface to prevent disturbance to the bottom mud layer during drainage.

[0010] Furthermore, the outlet of the recycled water tank is connected to the inlet of the desulfurization absorption tower via a recycled water pump; the outlet of the desulfurization wastewater pre-sedimentation tank is connected to the desulfurization wastewater treatment system.

[0011] Furthermore, the desulfurization absorption tower is also equipped with a second slurry discharge end, and the emergency slurry tank is also equipped with a second slurry feed pipe; the second slurry discharge end is connected to the regional slurry pool, and the outlet of the regional slurry pool is connected to the second slurry feed pipe of the emergency slurry tank after passing through the regional slurry pool slurry pump.

[0012] Furthermore, the control system is configured to: automatically switch to "emergency mode" when the liquid level in the emergency slurry tank reaches the high limit or when the emergency function needs to be activated, stop feeding into the emergency slurry tank and prepare to receive the emergency slurry from the desulfurization absorption tower; in "sedimentation mode", when the slurry in the emergency slurry tank reaches the set sedimentation time and the solid-liquid interface is clear, automatically open the supernatant discharge pipe to drain the water, close it after the clear liquid is discharged to the low liquid level, and then start the bottom stirring device and the emergency slurry pump to discharge sludge.

[0013] Furthermore, the emergency slurry tank is equipped with a sedimentation and separation function for the overflow from the gypsum hydrocyclone station, used for the raw water supply of desulfurization wastewater, ensuring the water quality and quantity of the desulfurization wastewater. Automatic valves are installed on all added pipelines, enabling online switching between different functions to meet the requirements of various operating conditions.

[0014] This invention also proposes a method for treating slurry from a desulfurization absorption tower, using the system described above, comprising the following steps: S1. System Judgment and Switching: When the desulfurization system is operating normally and the emergency slurry tank is idle, the control system switches it to "sedimentation mode"; S2. Sequential batch feeding and settling: Part of the slurry overflowing from the gypsum hydrocyclone station is continuously or intermittently introduced into the emergency slurry tank through the wastewater hydrocyclone station supply pump until the set liquid level is reached and then feeding is stopped. The slurry is allowed to settle in the emergency slurry tank for a predetermined time, so that the fine particles and the clear liquid are separated into layers. S3. Supernatant discharge: After settling is completed, the control system opens the valve of the supernatant discharge pipe to discharge the supernatant into the desulfurization wastewater pre-sedimentation tank until the liquid level in the tank drops to the set height; S4. Sediment Reuse Treatment: Close the valve of the supernatant discharge pipe, start the bottom stirring device of the emergency slurry tank to stir the settled concentrated sediment evenly, and then start the emergency slurry pump to transport all or part of the sediment back to the desulfurization absorption tower to continue to participate in the reaction, or transport it to the vacuum belt conveyor to mix and dewater with the underflow of the gypsum hydrocyclone station. S5. Cycle or switch: After completing S4, return to S2 to start the next processing cycle; if an accident alarm or maintenance command is received, the control system immediately switches the accident slurry tank to "emergency mode" to empty or stand by to receive the accident slurry discharged from the desulfurization absorption tower.

[0015] Furthermore, in step S2, the predetermined settling time is 6-12 hours. Specifically, the residence time and solid-liquid interface position can be determined by beaker settling tests based on the concentration and particle size of the microparticles in the slurry, to ensure sufficient settling of the slurry and achieve good solid-liquid separation. In step S4, the stirring time is 30-60 minutes. In step S3, the supernatant after gravity settling in the emergency slurry tank is discharged into the desulfurization wastewater pre-sedimentation tank. The single discharge volume can meet the treatment volume of one cycle of the desulfurization wastewater treatment system, matching the treatment volume of one standard treatment cycle of the desulfurization wastewater treatment system, thereby realizing the linkage operation of the settling separation of the emergency slurry tank and the desulfurization wastewater treatment system.

[0016] Furthermore, the control system, through a human-machine interface, enables automated control and intelligent operation of operations such as switching between emergency mode and normal settling mode of the slurry tank, and switching between functions of the slurry tank and the wastewater cyclone station.

[0017] The present invention discloses a method for treating slurry from a desulfurization absorption tower. Under normal operating conditions of the desulfurization and its auxiliary systems, and with the emergency slurry tank idle, the wastewater hydrocyclone station is shut down, and a bypass is added to the emergency slurry tank. Utilizing the tank's capacity and residence time, the system's solid-liquid separation function is enhanced, ensuring the discharge volume and quality of the desulfurization wastewater. Specifically, a bypass pipe is connected to the emergency slurry tank from the outlet of the wastewater hydrocyclone station's supply pump. During normal operation of the desulfurization system and while the emergency slurry tank is idle, the overflow from the gypsum hydrocyclone station is pumped into the emergency slurry tank for gravity settling. After the slurry settles and stratifies, the upper clear liquid is discharged into the desulfurization wastewater treatment system through a pipe. The bottom slurry is agitated by a stirrer and then recycled back to the absorption tower via the emergency slurry pump or pumped to a vacuum conveyor belt for dewatering.

[0018] During slurry poisoning or equipment maintenance, the slurry in the desulfurization absorption tower is pumped into an emergency slurry tank for temporary storage and disposal, thus fulfilling the basic function of the emergency slurry tank; the wastewater cyclone station can be started and stopped as needed.

[0019] During normal operation of the desulfurization absorption system, the supersaturated slurry in the absorption tower is pumped into a gypsum hydrocyclone station for solid-liquid separation via a gypsum discharge pump. The underflow from the gypsum hydrocyclone station is sent to a vacuum conveyor belt to produce desulfurized gypsum. Most of the overflow from the gypsum hydrocyclone station enters a recycled water tank and is pumped back to the absorption tower; a small portion enters the wastewater hydrocyclone station supply tank. The slurry in the wastewater hydrocyclone station supply tank is pumped into an emergency slurry tank for solid-liquid separation via a wastewater hydrocyclone station supply pump. In cases where the emergency slurry tank is at a high level or unusable, the slurry is pumped into the wastewater hydrocyclone station for solid-liquid separation via a wastewater hydrocyclone station supply pump, and the underflow from the wastewater hydrocyclone station enters the recycled water tank.

[0020] Compared with the prior art, the present invention has the following outstanding advantages: 1. Without changing the functions of the existing desulfurization system and emergency slurry tank, the emergency slurry tank can be used daily through system process optimization and pipeline design adjustment, achieving efficient solid-liquid separation and solving the problem of poor separation effect of wastewater hydrocyclone station for small particles.

[0021] 2. By partially modifying the emergency slurry tank, it was given the function of sequential batch gravity settling separation, making full use of the large volume of the emergency slurry tank and improving equipment utilization efficiency. The addition of a side-entry agitator, level gauge, and sight glass can effectively prevent slurry sedimentation and remove tiny insoluble particles from the desulfurization system via gypsum.

[0022] 3. Relying on automated control, the function switching of the emergency slurry tank and the commissioning time of the wastewater cyclone station can be realized as needed, and the load of the desulfurization wastewater treatment system can be linked to help improve the slurry quality of the desulfurization absorption tower. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the desulfurization absorption tower slurry treatment system and method of the present invention; In the diagram: 1. Desulfurization absorption tower; 2. Zone slurry tank; 3. Zone slurry tank slurry pump; 4. Emergency slurry tank; 5. Emergency slurry pump; 6. Gypsum discharge pump; 7. Gypsum hydrocyclone station; 8. Vacuum belt conveyor; 9. Reclaimed water tank; 10. Reclaimed water pump; 11. Wastewater hydrocyclone station supply tank; 12. Wastewater hydrocyclone station supply pump; 13. Wastewater hydrocyclone station; 14. Desulfurization wastewater pre-sedimentation tank; 15. Desulfurization wastewater treatment system; 16. Control system. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] This embodiment provides a desulfurization absorber slurry treatment system and method. A power plant's Phase II project comprises four 600MW coal-fired generating units, all using limestone-gypsum desulfurization devices, which were put into operation in 2013. A partial modification is being performed on the existing desulfurization system of Unit 5 (600MW). The wet desulfurization system of Unit 5 was put into operation in 2013. The optimized system is as follows: Figure 1 As shown, it includes: a desulfurization absorption tower 1, a zone slurry tank 2, a zone slurry tank slurry pump 3, an emergency slurry tank 4, an emergency slurry pump 5, a gypsum discharge pump 6, a gypsum hydrocyclone station 7, a vacuum belt conveyor 8, a recycled water tank 9, a recycled water pump 10, a wastewater hydrocyclone station supply tank 11, a wastewater hydrocyclone station supply pump 12, a wastewater hydrocyclone station 13, a desulfurization wastewater pre-sedimentation tank 14, a desulfurization wastewater treatment system 15, and a control system 16.

[0026] Its emergency slurry tank 4 has a specification of φ14m×14.5m (h) and an effective volume of 2100m³. 3 It has been idle for many years. This renovation, while retaining its original emergency emission function, will upgrade it as follows: (1) Install four side-entry agitators at the bottom of the box.

[0027] (2) Install a liquid level and mud level monitoring unit, specifically a high-precision ultrasonic mud level gauge and a radar level gauge, and connect the signal to the distributed control system (DCS).

[0028] (3) Install three corrosion-resistant viewing mirrors with manual rotating scrapers within a range of 0.5m above and below the expected solid-liquid interface (at an elevation of 3m).

[0029] (4) Add a DN150 bypass pipeline from the outlet of the wastewater hydrocyclone station supply pump 12 to the emergency slurry tank 4.

[0030] (5) A wastewater outlet is opened at an elevation of 3.5m in the accident slurry tank 4 (0.5m above the interface) and connected to the desulfurization wastewater pre-sedimentation tank 14.

[0031] (6) Add a new pipeline from the outlet of the accident slurry pump 5 to the feed end of the vacuum belt conveyor 8.

[0032] Install pneumatic or electric butterfly valves at critical locations on all new pipelines (feed, supernatant outlet, etc.).

[0033] Control logic configuration: A dedicated control module is added to the existing DCS (i.e., control system 16), with the following main logic: Mode determination: Receives the operating status signal of the absorption tower. During normal operation, it automatically enters "sedimentation mode"; upon receiving the "absorption tower emergency discharge" command or a manual forced command, it immediately switches to "emergency mode".

[0034] Settlement mode cyclic control: a) Feeding stage: Open the passage from wastewater hydrocyclone station supply pump 12 to emergency slurry tank 4, start wastewater hydrocyclone station supply pump 12, and inject slurry into the tank. When the level gauge reaches the set high level (corresponding to an effective volume of 1800m³), 3 When the material is in the sedimentation stage, stop feeding and close the feed valve. The settling time is set to 10 hours (the specific time can be determined by beaker sedimentation tests based on the concentration and particle size of the small particles in the slurry, to ensure sufficient sedimentation of the slurry and achieve good solid-liquid separation).

[0035] b) Drainage Stage: After the settling time is reached, the DCS, in conjunction with the video feed from the sightseeing mirror (optional), confirms that the interface is clear. The supernatant discharge valve automatically opens, and the supernatant flows out by gravity. When the liquid level drops to the low liquid level set value (with a buffer height of approximately 0.5 meters), the discharge valve closes.

[0036] c) Sludge Discharge Stage: After the drain valve is closed, four side agitators are automatically started and run for 15 minutes to ensure uniform suspension of the bottom sludge. Subsequently, emergency slurry pump 5 is started, and the reuse valve to the absorption tower is opened, pumping part of the sludge back to desulfurization absorption tower 1 and part back to vacuum conveyor belt 8 for reuse or gypsum production. During sludge discharge, the sludge level gauge monitors the sludge level drop. When the sludge level approaches the bottom plate, the pump and agitation are stopped, completing one cycle. The system automatically returns to the feeding standby state.

[0037] Linkage control: The single discharge volume of supernatant is about 1600m³, which matches the treatment capacity of the plant's desulfurization wastewater treatment system 15 per shift (8 hours), thus achieving flow coordination.

[0038] The relevant process flow is as follows: During normal operation of the desulfurization and gypsum system, the overflow from the gypsum hydrocyclone station 7 flows to the wastewater hydrocyclone station supply pump 12 and is pumped into the emergency slurry tank 4. When the emergency slurry tank 4 reaches a high level, the wastewater hydrocyclone station supply pump 12 switches to supplying liquid to the wastewater hydrocyclone station 13. The slurry settles naturally in the emergency slurry tank 4 for about 10 hours. Then, the valve on the supernatant discharge pipe of the emergency slurry tank 4 is opened, and the supernatant flows by gravity into the desulfurization wastewater pre-sedimentation tank 14. When the emergency slurry tank 4 reaches a low level, the wastewater outlet valve is closed, and the side agitator at the bottom of the emergency slurry tank 4 is started to stir the bottom slurry evenly. Then, the emergency slurry pump 5 is started to pump the settled gypsum slurry back to the desulfurization absorption tower 1 or the vacuum conveyor belt 8 for reuse or gypsum production. During the sludge discharge process, the sludge level gauge monitors the sludge level drop. When the sludge level approaches the bottom plate, the pump and agitation are stopped, and one cycle ends. The system automatically returns to the feeding standby state.

[0039] Running result:

[0040] After the system upgrade was in operation for one quarter, the data was compared with that before the upgrade: (1) Wastewater quality: The average concentration of suspended solids in the discharged desulfurization wastewater decreased from 850 mg / L before the renovation to 320 mg / L, a reduction of 62%. The chloride ion concentration became more stable, and the fluctuation range narrowed.

[0041] (2) Gypsum quality: The moisture content of gypsum products decreased from an average of 12% to below 10%, the purity of gypsum (CaSO4·2H2O content) increased from 90% to 92.5%, and the amount of fine particles entrained was reduced.

[0042] (3) System operation: The foaming phenomenon of the slurry in the absorption tower is reduced, the pH control is more stable, and the frequency of blockage in the gypsum hydrocyclone station is reduced.

[0043] (4) Equipment utilization rate: The utilization rate of the emergency slurry tank has been increased to 85%, which has completely changed the long-term idle state; it has achieved continuous and beneficial operation all year round, and the asset value has been fully realized.

[0044] This invention, through ingenious system integration and intelligent control, transforms idle emergency slurry tanks into key slurry deep purification units, achieving a significant improvement in the overall performance of the desulfurization system at a relatively low cost. It possesses high creativity and broad application value.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A desulfurization absorption tower slurry treatment system, comprising a desulfurization absorption tower (1), a gypsum discharge pump (6), a gypsum hydrocyclone station (7), a vacuum belt conveyor (8), a recycled water tank (9), a wastewater hydrocyclone station supply tank (11), a wastewater hydrocyclone station supply pump (12), a wastewater hydrocyclone station (13), a desulfurization wastewater pre-sedimentation tank (14), a desulfurization wastewater treatment system (15), and a control system (16); characterized in that, It also includes a partially modified emergency slurry tank (4); The feed inlet of the gypsum hydrocyclone station (7) is connected to the slurry discharge end of the desulfurization absorption tower (1) through the gypsum discharge pump (6). Its underflow outlet is used to output gypsum slurry to the vacuum belt conveyor (8). Its overflow outlet is divided into two paths: the first path is connected to the recycled water tank (9), and the second path is connected to the wastewater hydrocyclone station supply tank (11). The outlet of the wastewater hydrocyclone station supply tank (11) is connected to the wastewater hydrocyclone station (13) through the wastewater hydrocyclone station supply pump (12). The wastewater cyclone station (13) has its underflow outlet connected to the recycled water tank (9) and its overflow outlet connected to the desulfurization wastewater pre-sedimentation tank (14). The emergency slurry tank (4) serves as the core settling unit and is equipped with a slurry feed pipe, a supernatant discharge pipe, a bottom stirring device, an emergency slurry pump (5), and a liquid level and sludge level monitoring unit. The slurry feed pipe is connected to the bypass outlet of the wastewater hydrocyclone station supply pump (12). The inlet of the emergency slurry pump (5) is connected to the bottom of the emergency slurry tank (4), and its outlet is divided into two paths: one path is connected to the desulfurization absorption tower (1), and the other path is connected to the feed end of the vacuum belt conveyor (8). The control system (16) is connected to the valves on the slurry feed pipe and the supernatant discharge pipe, the bottom stirring device, the bottom mud discharge pump (5), and the liquid level and mud level monitoring unit. It is configured to control the emergency slurry tank (4) to automatically switch between "settling mode" and "emergency mode" according to the monitoring data, and to sequentially perform feeding, settling, drainage, and mud discharge operation cycles.

2. The desulfurization absorption tower slurry treatment system according to claim 1, characterized in that, The slurry feed pipe is connected to the bypass outlet of the wastewater hydrocyclone station supply pump (12) to receive the overflow slurry from the gypsum hydrocyclone station (7); The inlet of the supernatant discharge pipe is located at a predetermined height on the inner wall of the emergency slurry tank (4), and the outlet is connected to the inlet of the desulfurization wastewater pre-sedimentation tank (14). The bottom stirring device is installed at the bottom or lower side of the emergency slurry tank (4) to disturb the concentrated bottom mud after settling. The liquid level and mud level monitoring unit is used to monitor the interface height between the clear liquid and mud inside the accident slurry tank (4) in real time.

3. The desulfurization absorption tower slurry treatment system according to claim 1, characterized in that, The side wall of the accident slurry tank (4) is provided with at least one sight glass with an inner scraper. The installation height of the sight glass corresponds to the vicinity of the designed solid-liquid separation interface, and is used to observe the sedimentation effect and perform self-cleaning of the mirror surface.

4. The desulfurization absorption tower slurry treatment system according to claim 3, characterized in that, The inlet of the supernatant discharge pipe is located on the inner wall of the accident slurry tank (4) at a distance of 0.3 to 1.0 meters above the designed solid-liquid separation interface to prevent disturbance to the bottom mud layer during drainage.

5. The desulfurization absorption tower slurry treatment system according to claim 1, characterized in that, The outlet of the recycled water tank (9) is connected to the inlet of the desulfurization absorption tower (1) via a recycled water pump (10); the outlet of the desulfurization wastewater pre-sedimentation tank (14) is connected to the desulfurization wastewater treatment system (15).

6. The desulfurization absorber slurry treatment system according to claim 1, characterized in that, The desulfurization absorption tower (1) is also provided with a second slurry discharge end, and the emergency slurry tank (4) is also provided with a second slurry feed pipe; the second slurry discharge end is connected to the regional slurry pool (2), and the outlet of the regional slurry pool (2) is connected to the second slurry feed pipe of the emergency slurry tank (4) after passing through the regional slurry pool slurry pump (3).

7. The desulfurization absorber slurry treatment system according to claim 1, characterized in that, The control system (16) is configured to automatically switch to "emergency mode" when the liquid level of the emergency slurry tank (4) reaches the high limit or the emergency function needs to be activated, stop feeding into the emergency slurry tank (4) and prepare to receive the emergency slurry from the desulfurization absorption tower (1); in "settling mode", when the slurry in the emergency slurry tank (4) reaches the set set settling time and the solid-liquid interface is clear, the supernatant discharge pipe is automatically opened to drain the water, and after the clear liquid is drained to the low liquid level, it is closed, and then the bottom stirring device and the emergency slurry pump (5) are started to discharge sludge.

8. A method for treating slurry from a desulfurization absorption tower, comprising using the system described in any one of claims 1-7, characterized in that, Includes the following steps: S1. System Judgment and Switching: When the desulfurization system is operating normally and the emergency slurry tank (4) is idle, the control system (16) switches it to "settling mode"; S2. Sequential batch feeding and settling: Part of the slurry overflowing from the gypsum hydrocyclone station (7) is continuously or intermittently introduced into the emergency slurry tank (4) through the wastewater hydrocyclone station supply pump (12) until the set liquid level is reached and then feeding is stopped. The slurry is allowed to settle in the emergency slurry tank (4) for a predetermined time, so that the fine particles and the clear liquid are separated into layers. S3. Supernatant discharge: After settling is completed, the control system (16) opens the valve of the supernatant discharge pipe to discharge the supernatant to the desulfurization wastewater pre-sedimentation tank (14) until the liquid level in the tank drops to the set height; S4. Reuse of bottom sediment: Close the valve of the supernatant discharge pipe, start the bottom stirring device of the emergency slurry tank (4) to stir the settled concentrated bottom sediment evenly, and then start the emergency slurry pump (5) to transport all or part of the bottom sediment back to the desulfurization absorption tower (1) to continue to participate in the reaction, or transport it to the vacuum belt conveyor (8) to mix and dewater with the underflow of the gypsum hydrocyclone station (7); S5. Cycle or switch: After completing S4, return to S2 to start the next processing cycle; if an accident alarm or maintenance instruction is received, the control system (16) immediately switches the accident slurry tank (4) to "emergency mode" to empty or stand by to receive the accident slurry discharged from the desulfurization absorption tower (1).

9. The method for treating slurry in a desulfurization absorption tower according to claim 8, characterized in that, In step S2, the sedimentation time is 6-12 hours; in step S4, the stirring time is 30-60 minutes; in step S3, the amount of clear liquid discharged in a single operation matches the treatment capacity of a standard treatment cycle of the desulfurization wastewater treatment system (15).

10. A method for treating slurry in a desulfurization absorption tower according to claim 8, characterized in that, The control system (16) switches between emergency mode and normal settling mode of the accident slurry tank (4) through a human-machine interface.

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