CFB desulfurization system fluidization cooperative regulation and control method and system based on screw scale interlocking

Abstract

The invention relates to the technical field of desulfurization, in particular to a CFB desulfurization system fluidization cooperative regulation and control method and system based on screw scale interlocking, a screw scale is arranged in a blanking pipeline between a cinder valve and a fluidization chute, and is used for weighing and displaying the blanking flow of slaked lime in real time; the spiral scale and a frequency converter of the cinder valve are subjected to interlocking control through a control system; the fluidization air quantity at the bottom of the slaked lime bin is gradually increased, and meanwhile, the fluidization air quantity at the upper part of the slaked lime bin is gradually reduced. The system has the advantages that the spiral scale is additionally arranged on a critical blanking path and is in linkage control with the cinder valve, so that the original'black box 'management is changed into transparent and datamation more accurate management, the system can display and feed back the actual blanking flow in real time, post personnel and a control system can accurately master the feeding state at the first time, and the working efficiency is improved. When the cinder valve idles and the spiral scale does not have a material suspension phenomenon of a flow signal, the system immediately triggers a sound alarm.

Description

Technical Field

[0001] This invention relates to the field of desulfurization technology, and in particular to a fluidization synergistic control method and system for a CFB desulfurization system based on screw scale interlocking. Background Technology

[0002] Circulating fluidized bed (CFB) desulfurization technology is one of the most widely used and efficient processes in industrial flue gas treatment, especially in the field of sintering flue gas desulfurization. In this technology, the desulfurizing agent, quicklime, is usually stored in a quicklime silo and transported to the fluidizing chute by a frequency converter discharge valve at the bottom of the silo. After being propelled by fluidizing air, it enters the absorption tower to react with sulfur dioxide in the flue gas.

[0003] However, existing CFB desulfurization systems have the following technical defects that urgently need to be addressed in the feeding and conveying of hydrated lime:

[0004] 1. The material feeding process lacks effective monitoring, making it prone to "suspended material" and difficult to predict in advance:

[0005] Existing systems typically do not have any real-time weighing or flow monitoring devices installed along the conveying path between the variable frequency ash discharge valve and the fluidizing chute. (See...) Figure 1 Operators cannot know the actual material discharge situation after the ash discharge valve is activated. This leads to the control system being unable to identify the "suspended material" phenomenon (i.e., the material forms a blockage or bridging in the bin or discharge port and cannot fall normally) in a timely manner. On-site personnel can only discover the problem through regular inspections or until the desulfurization efficiency drops significantly, resulting in a serious delay in response.

[0006] 2. Equipment idling and system misjudgment lead to production and environmental risks:

[0007] Due to a lack of monitoring, when "suspended material" occurs, the ash discharge valve continues to operate under the drive of the frequency converter, but its actual discharge volume is zero. The control system misjudges this as normal material supply and fails to increase the feed or issue an alarm in time. The direct consequence is that the desulfurizing agent in the absorption tower cannot be replenished, the desulfurization efficiency drops sharply, and the sulfur dioxide concentration at the outlet exceeds the standard. In order to meet environmental data requirements, enterprises are often forced to take measures to temporarily shut down the system, which seriously affects the continuity and stability of the main production and poses a significant risk to environmental compliance.

[0008] 3. Inappropriate fluidizing air configuration exacerbates the risk of material blockage:

[0009] The traditional lime silo and conveying system has design defects, the fluidization air distribution is usually designed to be uniform, and the difference in fluidization characteristics of the material at different positions is not considered, which leads to excessive suspension of the material in the upper part of the silo, and the bottom fluidization air volume is relatively insufficient, which cannot effectively destroy the initial bridging and compaction state of the material; such unreasonable air volume distribution not only fails to promote the flow of the material, but also increases the probability of "suspended material", forming a vicious cycle.

[0010] In summary, due to the lack of monitoring means and the structural defects of the fluidization air configuration, the feeding link of the CFB desulfurization system becomes a "black box" with weak reliability, and the stability and intelligent level of the system operation are low. SUMMARY

[0011] The purpose of the present application is to provide a CFB desulfurization system fluidization collaborative control method and system based on screw scale interlocking, which can realize real-time visualization monitoring of the discharging state, immediate alarm of the suspended material fault, and optimization of the fluidization effect from the root cause, and improve the material flowability.

[0012] To achieve the above purpose, the following technical solutions are adopted:

[0013] A CFB desulfurization system fluidization collaborative control method based on screw scale interlocking, comprising:

[0014] A screw scale is arranged in the discharging pipeline between the ash discharge valve and the fluidization chute, for real-time weighing and displaying the discharging flow of the lime;

[0015] The screw scale and the frequency converter of the ash discharge valve are interlocked and controlled by the control system;

[0016] Optimizing the fluidization air configuration of the lime silo: gradually increasing the fluidization air volume at the bottom of the lime silo, and gradually reducing the fluidization air volume at the upper part of the lime silo.

[0017] Increasing the fluidization air volume at the bottom of the lime silo is achieved by gradually increasing the opening degree of the group of air volume adjusting valves one on the bottom fluidization air pipeline one; reducing the fluidization air volume at the upper part of the lime silo is achieved by adjusting the opening degree of the group of air volume adjusting valves two arranged on the upper fluidization air pipeline two.

[0018] Further comprising a sound alarm module, when the control system detects that the ash discharge valve is in the running state and the screw scale has no discharging flow signal, the sound alarm module alarms.

[0019] The screw scale and the frequency converter of the ash discharge valve are interlocked and controlled by the control system, comprising:

[0020] When the ash discharge valve starts, the screw scale starts synchronously;

[0021] After the ash valve stops, the screw scale delays for a set time and stops.

[0022] The interlocking control of the screw scale and the frequency converter of the ash valve by the control system further comprises: using the signal feedback of the discharging flow to control the running frequency of the frequency converter of the ash valve, so as to complete the adjustment of the discharging flow of the screw scale according to the sulfur dioxide concentration at the desulfurization outlet.

[0023] The adjustment of the discharging flow of the screw scale according to the sulfur dioxide concentration at the desulfurization outlet comprises:

[0024] When the sulfur dioxide concentration at the desulfurization outlet is less than or equal to a first preset value, the ash valve is started; When the sulfur dioxide concentration at the desulfurization outlet is greater than or equal to a second preset value, the ash valve is stopped.

[0025] When the sulfur dioxide concentration at the desulfurization outlet is greater than the first preset value and less than the second preset value, the ash valve is controlled to run at full load.

[0026] When the sulfur dioxide concentration at the desulfurization outlet is less than the first preset value, the ash valve is stopped.

[0027] A fluidization collaborative control system of a CFB desulfurization system based on interlocking of a screw scale, comprising a screw scale, a lime slake bin, an ash valve, and a fluidization chute, the inlet of the screw scale is connected with the outlet of the ash valve, the discharging outlet of the screw scale is connected with the inlet of the fluidization chute, and the inlet of the ash valve is connected with the outlet of the lime slake bin, so that the screw scale is installed in series in the discharging path between the ash valve and the fluidization chute.

[0028] Further comprising a first group of air volume regulating valves, a second group of air volume regulating valves, and a fluidization blower, the fluidization blower is connected with a fluidization main pipe, the fluidization main pipe is connected with the input end of a fluidization air pipe, the output end of the fluidization air pipe is communicated with the conical hopper of the lime slake bin, and the fluidization air pipe is provided with the first group of air volume regulating valves.

[0029] The fluidization main pipe is connected with the input end of a second fluidization air pipe, the output end of the second fluidization air pipe is communicated with the upper bin arm of the lime slake bin, and the second fluidization air pipe is provided with the second group of air volume regulating valves.

[0030] The outlet of the fluidization chute is used for being connected with the inlet of an absorption tower.

[0031] The system further comprises a bypass pipe configured to guide the material flow from the ash valve directly to the fluidization chute when the screw scale fails, so as to bypass the screw scale.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] ​​1. By adding a screw weigher to the critical material feeding path and interlocking it with the ash discharge valve, the original "black box" is transformed into a more transparent and data-driven, more precise management system. The system can display and provide feedback on the actual material feeding flow in real time, enabling personnel and the control system to accurately grasp the feeding status immediately. Once the ash discharge valve runs dry and the screw weigher has no flow signal, the system can immediately trigger an audible alarm, realizing a fundamental shift from passive detection to proactive early warning. This buys valuable time for troubleshooting and avoids desulfurization interruption accidents caused by suspended material.

[0034] 2. By linking the feed rate signal of the screw conveyor with the sulfur dioxide concentration data at the desulfurization tower outlet, a more precise feedback control closed loop is constructed. The system can automatically and promptly adjust the hydrated lime feed rate according to changes in flue gas load, achieving "on-demand supply." This not only ensures stable desulfurization efficiency but also keeps emission concentrations consistently within ultra-low emission standards. Within a certain range, it also effectively avoids the waste or insufficient supply of desulfurizing agents, achieving the dual goals of environmental compliance and cost control;

[0035] 3. In response to the structural defects of unreasonable fluidizing air distribution in traditional systems, this invention effectively solves the problem of "suspended material at the top and caking material at the bottom" by increasing the bottom fluidizing air volume and decreasing the top fluidizing air volume through a differentiated configuration strategy. This significantly enhances the initial fluidization effect of the material in the bottom outlet area of ​​the silo, providing a "first driving force" for material flow and fundamentally reducing the probability of "suspended material" and improving the inherent reliability and stability of the entire feeding system.

[0036] 4. By setting up a bypass pipeline, the present invention has an effective emergency handling capability. When the screw scale needs to be repaired or malfunctions, the system can quickly switch to bypass mode to maintain the normal supply of quicklime and ensure the uninterrupted operation of the desulfurization system. This design avoids the shutdown of the entire production line caused by a single equipment failure, greatly reduces unplanned downtime, and is of great significance for ensuring the continuous operation of the main production. Attached Figure Description

[0037] Figure 1 This is a fluidization structure diagram of the CFB desulfurization system before the modification.

[0038] Figure 2 This is a structural diagram of the fluidization coordinated control system of the CFB desulfurization system based on the screw scale interlock.

[0039] In the diagram: 1. Slaked lime silo; 2. Ash discharge valve; 3. Fluidizing chute; 4. Absorption tower; 5. Two sets of air volume regulating valves; 6. Two fluidizing air ducts; 7. Fluidizing air main duct; 8. One fluidizing air duct; 9. One set of air volume regulating valves; 10. Discharge port; 11. Screw scale. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0041] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0042] Example 1

[0043] See Figure 2 A fluidized bed control system for CFB desulfurization based on screw scale interlocking includes a screw scale 11, a quicklime silo 1, an ash discharge valve 2, a fluidized bed 3, a set of air volume regulating valves 9, a second set of air volume regulating valves 5, and a fluidizing blower. The feed inlet of the screw scale is connected to the outlet of the ash discharge valve 2, the discharge port 10 of the screw scale is connected to the inlet of the fluidized bed 3, the outlet of the fluidized bed 3 is connected to the inlet of the absorption tower 4, and the inlet of the ash discharge valve 2 is connected to the outlet of the quicklime silo 1, so that the screw scale is installed in series in the discharge path between the ash discharge valve 2 and the fluidized bed 3.

[0044] The fluidizing main pipe is connected to the input end of the fluidizing air duct 8, and the output end of the fluidizing air duct 8 is connected to the conical part of the quicklime silo 1. The fluidizing air duct 8 is equipped with a set of air volume regulating valves 9. The fluidizing air duct 8 is connected to the fluidizing air main pipe 7, and the fluidizing air main pipe 7 is connected to the fluidizing blower. The set of air volume regulating valves 9 includes four air volume regulating valves 1, and the four air volume regulating valves 1 operate synchronously.

[0045] The fluidizing main pipe is connected to the input end of the fluidizing air duct 2 6, and the output end of the fluidizing air duct 2 6 is connected to the upper arm of the quicklime silo 1. The fluidizing air duct 2 6 is equipped with a group 2 of air volume regulating valves 5; the group 2 of air volume regulating valves 5 includes four air volume regulating valves 2, and the four air volume regulating valves 2 operate synchronously.

[0046] The bypass pipeline is configured to guide the material flow directly from the ash discharge valve 2 to the fluidizing chute 3 when the screw scale fails, thereby bypassing the screw scale.

[0047] A Fluidization Coordination Control Method for CFB Desulfurization System Based on Screw Scale Interlocking

[0048] Based on a PLC / DCS control system, the system ensures stable operation through precise and coordinated control of feeding, fluidization, and alarms. Specifically, it includes the following steps:

[0049] S1. Install a 10T / h screw scale (matching the discharge capacity of two 5T / h ash discharge valves 2) in the discharge pipe between ash discharge valve 2 and fluidizing chute 3. This scale is used to weigh and display the discharge flow rate of hydrated lime in real time. The discharge flow rate signal is transmitted to the PLC / DCS system in real time as a standard 4-20 mA signal. Simultaneously, perform initial fluidizing air configuration on hydrated lime silo 1.

[0050] The opening of the air volume regulating valve group 9 on the bottom fluidizing air duct 8 is initially set to "60%-70%" to ensure that the bottom material receives sufficient initial fluidizing force.

[0051] The opening of the air volume regulating valve group 5 on the upper fluidizing air duct 2 6 is initially set to "20%-30%" to reduce the upper air pressure and avoid excessive suspension and accumulation of materials.

[0052] S2. The frequency converters of the screw scale and the ash discharge valve 2 are interlocked and controlled via a PLC / DCS system. The core logic includes:

[0053] S21, Start / Stop Interlock:

[0054] When the ash discharge valve 2 is started, the screw scale starts synchronously, achieving metering without delay;

[0055] After the ash discharge valve 2 stops, the screw scale will stop after a delay of 25-35 seconds (preferably 30 seconds) to clear the residual material in the pipeline and prevent blockage.

[0056] S22, Feedback Control

[0057] By using the feed flow signal from the screw weigher (as process monitoring) and the sulfur dioxide concentration signal at the desulfurization tower outlet (as control target), a closed-loop control is formed to dynamically adjust the operating frequency (i.e., feed rate) of the ash discharge valve 2 frequency converter:

[0058] when At that time, the PLC / DCS system outputs a command to start the ash discharge valve 2, and the frequency converter operates at a frequency of 25-35 Hz;

[0059] when At that time, the system determined that it was necessary to urgently increase the dosage of desulfurizing agent and control the frequency converter of ash discharge valve 2 to operate at full load at 48-50 Hz;

[0060] when When the system determines that the desulfurizing agent is sufficient, it outputs a command to stop the ash discharge valve 2.

[0061] S3. Optimization and solidification of fluidized air configuration:

[0062] After the system was put into operation, the initial fluidizing air configuration in S1 was fine-tuned and optimized based on actual material flow observations.

[0063] If material discharge is still obstructed at the bottom of the silo, gradually increase the opening of the bottom air volume regulating valve group 9 to the final working opening of 75%-85%.

[0064] If there is still material adhering to the upper wall of the silo, the opening of the upper air volume regulating valve group 5 can be gradually reduced to the final working opening of 15%-20%.

[0065] This optimization aims to create an ideal fluidization state of "strong fluidization at the bottom and weak suspension at the top," minimizing the risk of material suspension.

[0066] S4. Set up audible and visual alarm for suspended material failure:

[0067] Install audible and visual alarms (operating voltage: 24VDC, sound intensity ≥85dB) on the control room console and key on-site positions.

[0068] When the PLC / DCS system detects that the operation feedback signal of the ash discharge valve 2 lasts for more than 15 seconds, while the flow signal of the screw scale is less than 0.1 t / h (close to zero), the system determines that a "suspended material" or "idling" fault has occurred and immediately triggers the audible and visual alarm module.

[0069] The alarm emits a flashing red light and intermittent beeping to alert personnel to check and handle the situation promptly, thereby preventing the equipment from running idle for extended periods and reducing desulfurization efficiency.

[0070] Example 2

[0071] In this embodiment, a fluidization coordinated control method and system for a CFB desulfurization system based on screw scale interlocking is the same as in Embodiment 1. The working process is as follows:

[0072] 1. System startup and initialization;

[0073] Step S11: System check;

[0074] Before starting, operators need to check whether the material level in the quicklime silo is sufficient and confirm that the ash discharge valve, screw scale, fluidizing chute, blower, and air volume regulating valve are in normal working order. Ensure that the initial opening of the first and second groups of air volume regulating valves in fluidizing air duct one (bottom) and fluidizing air duct two (upper) are set to the default values ​​(for example, the opening of the first group of bottom air volume regulating valves is 50%, and the opening of the second group of upper air volume regulating valves is 30%).

[0075] Step S12: Start the fluidized air system:

[0076] Start the blower to provide fluidizing air to the quicklime silo;

[0077] Gradually adjust the airflow regulating valves: Slowly increase the opening of the first set of airflow regulating valves on the bottom fluidizing air duct, for example, by 10% each time, while gradually decreasing the opening of the second set of airflow regulating valves on the upper fluidizing air duct, for example, by 10% each time, until the bottom fluidizing airflow is significantly enhanced and the upper fluidizing airflow is moderately weakened, in order to optimize material flowability.

[0078] Typically, the goal is to adjust the opening of the bottom airflow regulating valve group one to 70%-80% and the opening of the upper airflow regulating valve group two to 10%-20%, with fine adjustments made based on the actual material fluidization effect.

[0079] Step S13: Start the desulfurization system:

[0080] After the fluidizing air stabilizes, start the absorption tower and related flue gas treatment equipment;

[0081] The control system monitors the sulfur dioxide concentration at the desulfurization tower outlet in real time.

[0082] when When the time comes, the ash discharge valve and screw scale will start automatically (both start synchronously and interlocked).

[0083] The screw scale weighs and displays the flow rate of hydrated lime in real time, and the data is uploaded to the control system.

[0084] 2. Normal operation and monitoring;

[0085] Step S21: Monitoring and Adjusting Material Feed Flow Rate

[0086] The screw scale continuously monitors the material flow rate and is interlocked with the frequency converter of the ash discharge valve through the control system;

[0087] Operators can view the material flow rate curve and values ​​in real time on the control interface;

[0088] If the material flow rate is normal, for example, matching the set value, the system maintains its current operating state.

[0089] Step S22: According to Automatic concentration adjustment:

[0090] The control system dynamically adjusts the operating frequency of the ash discharge valve based on the sulfur dioxide concentration at the desulfurization tower outlet.

[0091] when At this time, the ash discharge valve operates at a lower frequency, and the feed flow of the screw scale is controlled proportionally;

[0092] when At this time, the ash discharge valve switches to full-load operation (the frequency converter outputs the highest frequency), and the screw weigher discharges the material at maximum flow rate to ensure a sufficient supply of desulfurizing agent;

[0093] when When the ash discharge valve stops automatically, the screw scale will stop after a set delay (e.g., 5-10 minutes) after the ash discharge valve stops, in order to clear the residual material in the pipeline.

[0094] Step S23: Fluidized air optimization and maintenance:

[0095] During operation, operators should regularly check the fluidization effect. If material flow is found to be obstructed, the opening of the first and second sets of air volume regulating valves can be finely adjusted to ensure that the fluidization air volume at the bottom is always better than that at the top, thus preventing "material suspension".

[0096] Typically, the air pressure and air volume data are checked once per shift (8 hours).

[0097] 3. Alarm and fault handling;

[0098] When the control system detects that the ash discharge valve is in operation, but the screw scale has no discharge flow signal (lasting for more than 30 seconds), it determines that there is a "suspended material" fault and immediately triggers the sound alarm module.

[0099] Upon hearing the alarm, the operator must take the following measures:

[0100] Suspend the operation of the ash discharge valve and check whether the slaked lime silo discharge port is blocked. If necessary, manually clear the blockage or knock the silo wall to break up the bridging.

[0101] At the same time, temporarily increase the bottom fluidization air volume, that is, quickly increase the opening of a set of air volume regulating valves to the maximum to enhance the fluidization effect;

[0102] Once the suspension is released and the screw scale restores the flow signal, the system can be restarted.

[0103] 4. System shutdown;

[0104] Step S41: Normal shutdown:

[0105] When the desulfurization system needs to be shut down, the ash discharge valve is stopped first, and the screw conveyor automatically stops after a set time (e.g., 5 minutes) to ensure that the material in the pipeline has been completely transported.

[0106] Then stop the fluidized air system and the absorption tower equipment.

[0107] Step S42: Emergency Stop

[0108] In case of emergencies, such as equipment failure or environmental accidents, all equipment, including ash discharge valves, screw scales and fans, can be stopped immediately by pressing the emergency button.

[0109] Afterwards, the system status should be checked and the cause of the failure recorded.

[0110] Precautions:

[0111] Operators need to be trained and familiar with the control interface and alarm handling procedures;

[0112] Regularly calibrate the weighing accuracy of the screw scale to ensure data reliability;

[0113] Fluidization air adjustments should be made gradually to avoid sudden changes that could cause material splashing or blockage.

[0114] During maintenance, it is essential to lock the power supply to ensure safety.

[0115] Through the above operations, the CFB desulfurization system can be made to operate intelligently and stably, effectively preventing material suspension failures and improving desulfurization efficiency and environmental compliance.

[0116] This invention transforms the previously "black box" system into a transparent and data-driven system through the addition of a screw weigher along the critical material feeding path and its interlocking control with the ash discharge valve. The system displays and provides real-time feedback on the actual material flow rate, enabling personnel and the control system to accurately grasp the feeding status immediately. In the event of a "suspended material" phenomenon (ash discharge valve idling while the screw weigher shows no flow signal), the system immediately triggers an audible alarm, achieving a fundamental shift from passive detection to proactive early warning. This provides valuable time for troubleshooting and prevents desulfurization interruptions caused by suspended material. Furthermore, by linking the screw weigher's feeding signal with the sulfur dioxide concentration data at the desulfurization tower outlet, a more precise feedback control loop is constructed. The system can automatically and promptly adjust the hydrated lime feed rate based on flue gas load changes, achieving "on-demand supply." This not only ensures stable desulfurization efficiency but also keeps emission concentrations consistently within ultra-low emission standards. Within a certain range, it effectively avoids the waste or insufficient supply of desulfurizing agent, achieving the dual goals of environmental compliance and cost control. Addressing the structural defects of traditional fluidizing air distribution, this invention employs a differentiated configuration strategy of increasing the bottom fluidizing air volume and decreasing the top fluidizing air volume. This effectively solves the problem of material "suspension at the top and caking at the bottom," significantly enhancing the initial fluidization effect of the material in the bottom outlet area, providing a "first driving force" for material flow, fundamentally reducing the probability of "suspended material," and improving the inherent reliability and stability of the entire feeding system. By setting up a bypass pipeline, this invention possesses effective emergency handling capabilities. When the screw scale needs maintenance or malfunctions, the system can quickly switch to bypass mode to maintain the normal supply of quicklime, ensuring uninterrupted operation of the desulfurization system. This design avoids a complete shutdown due to a single equipment failure, greatly reducing unplanned downtime and playing a crucial role in ensuring the continuous operation of the main production line.

Claims

1. A method for fluidization coordinated control of a CFB desulfurization system based on screw scale interlocking, characterized in that, include: A screw weigher is installed in the discharge pipe between the ash discharge valve and the fluidizing chute to weigh and display the discharge flow rate of hydrated lime in real time; The screw scale and the ash discharge valve are interlocked and controlled by the frequency converter through the control system. Optimize the fluidizing air configuration of the quicklime silo: gradually increase the fluidizing air volume at the bottom of the quicklime silo, while gradually decreasing the fluidizing air volume at the top of the quicklime silo.

2. The fluidization coordinated control method for a CFB desulfurization system based on screw scale interlocking according to claim 1, characterized in that, The increase in fluidizing air volume at the bottom of the quicklime silo is achieved by gradually increasing the opening of a set of air volume regulating valves on the bottom fluidizing air duct; the decrease in fluidizing air volume at the top of the quicklime silo is achieved by decreasing the opening of a set of air volume regulating valves on the upper fluidizing air duct.

3. The fluidization coordinated control method for a CFB desulfurization system based on screw scale interlocking according to claim 1, characterized in that, It also includes a sound alarm module. When the control system detects that the ash discharge valve is in operation but the screw scale has no discharge flow signal, the sound alarm module will sound an alarm.

4. The fluidization coordinated control method for a CFB desulfurization system based on screw scale interlocking according to claim 1, characterized in that, The aforementioned control system for interlocking the screw scale and the ash discharge valve via frequency converter includes: When the ash discharge valve starts, the screw scale starts simultaneously; After the ash discharge valve stops, the screw scale will stop after a set delay time.

5. The fluidization coordinated control method for a CFB desulfurization system based on screw scale interlocking according to claim 5, characterized in that, The aforementioned frequency converter interlock control of the screw scale and the ash discharge valve through the control system also includes: using the signal feedback of the discharge flow rate to control the frequency converter operating frequency of the ash discharge valve, so as to adjust the discharge flow rate of the screw scale according to the sulfur dioxide concentration at the desulfurization outlet.

6. The fluidization coordinated control method for a CFB desulfurization system based on screw scale interlocking according to claim 5, characterized in that, The method of adjusting the feed flow rate of the screw conveyor based on the sulfur dioxide concentration at the desulfurization outlet includes: when At that time, start the ash discharge valve; when At that time, control the ash discharge valve to operate at full load; when Stop the ash discharge valve when the following conditions are met.

7. A fluidization coordinated control system for a CFB desulfurization system based on screw scale interlocking for implementing the method according to claims 1-6, characterized in that, The system includes a screw weigher, a lime silo, an ash discharge valve, and a fluidizing chute. The screw weigher's inlet is connected to the ash discharge valve's outlet, the screw weigher's outlet is connected to the fluidizing chute's inlet, and the ash discharge valve's inlet is connected to the lime silo's outlet, so that the screw weigher is installed in series in the discharge path between the ash discharge valve and the fluidizing chute.

8. The fluidization coordinated control system for a CFB desulfurization system based on screw scale interlocking according to claim 7, characterized in that, It also includes a set of air volume regulating valves, a second set of air volume regulating valves, and a fan. The fan is connected to the fluidizing air main pipe, the fluidizing air main pipe is connected to the input end of fluidizing air duct one, the output end of fluidizing air duct one is connected to the conical part of the quicklime silo, and a set of air volume regulating valves is provided on fluidizing air duct one. The main fluidizing air duct is connected to the input end of fluidizing air duct 2, and the output end of fluidizing air duct 2 is connected to the upper arm of the quicklime silo. Two sets of air volume regulating valves are installed on fluidizing air duct 2.

9. A fluidization coordinated control system for a CFB desulfurization system based on screw scale interlocking as described in claim 7, characterized in that, The outlet of the fluidizing chute is used to connect to the inlet of the absorption tower.

10. A fluidization coordinated control system for a CFB desulfurization system based on screw scale interlocking as described in claim 7, characterized in that, The system also includes a bypass pipeline configured to redirect the material flow directly from the ash discharge valve to the fluidizing chute in the event of a screw conveyor malfunction, thereby bypassing the screw conveyor.

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