Automatic deslagging and safe filtering system and method for gasified slag slurry conveyed by pipeline

Abstract

The invention discloses an automatic deslagging and safe filtering system for pipeline conveying gasified slag slurry. The automatic deslagging and safe filtering system comprises a gasified slag locking hopper, an electric release valve and a slag breaking machine are arranged on the ore pulp pipeline, a vibrating screen is arranged below the ore pulp pipeline, a buffer tank is arranged at the bottom of the vibrating screen, the bottom flow of the buffer tank is connected with a wear-resistant slurry pump through the ore pulp pipeline, electric knife gate valves are arranged on an inlet pipeline and an outlet pipeline of the wear-resistant slurry pump, and a conical filtering tank is further arranged at the tail part of the ore pulp pipeline; the conical filtering tank is provided with an inclined filtering screen, an inlet pressure transmitter is mounted on the upstream side wall of the conical filtering tank, an outlet pressure transmitter is mounted on the downstream side wall of the conical filtering tank, and the top of the conical filtering tank is connected with a flushing water pipeline; from an electric knife gate valve at an inlet of the wear-resistant slurry pump to an electric knife gate valve on a downstream pipeline of the conical filtering tank, two sets of pumping filtering systems consisting of intermediate equipment are arranged, one is used, and the other is standby; safe filtration and continuous automatic slag removal without stopping are realized, and the stability and safety of the system are protected.

Description

Technical Field

[0001] This invention belongs to the field of gasification slurry pipeline transportation and filtration technology, specifically relating to an automatic slag removal and safety filtration system for pipeline transportation of gasification slurry. It can be applied to the slag discharge area of ​​a chemical plant gasification unit, safely delivering the gasification slurry in the slag hopper of the gasifier to the pumping system after slag removal and filtration by the system of this invention, thus achieving safe and stable pipeline transportation of gasification slurry. Background Technology

[0002] The slag discharge from the gasification slag lock hopper contains a variety of impurities, including coarse and fine gasification slag, and sometimes refractory brick fragments from the furnace. Even after being crushed by the slag crusher, coarse particles and large-volume slag remain, which affects the safety of the pipeline transportation method and can easily cause pump jamming and screen jamming accidents. At the same time, these coarse particles and large-volume slag, after entering the pipeline, are prone to forming soft / hard sediments due to their fast settling speed and poor fluidity, which affects the stability of the pumping system and production safety.

[0003] Traditional filtration technology for slurry pipeline transportation relies solely on a single filter at the pump outlet. While this can handle situations where coarse particles are small in size and low in content, it suffers from insufficient throughput and easy screen clogging when dealing with gasifier slag discharge containing large and abundant coarse particles. Consequently, it fails to meet the technical requirements of pipeline slag transportation and compromises the safety of pipeline transport.

[0004] Traditional filter screens are installed perpendicular to the fluid flow direction inside a rectangular filter tank, and there is no slag discharge port. Coarse particles and large-volume slag accumulate at the front end of the filter screen, causing pressure fluctuations in the production line and even clogging the screen. Since they cannot be discharged automatically, the pumping system needs to be stopped and the tank needs to be disassembled for slag discharge, which is time-consuming, labor-intensive, and delays production. Summary of the Invention

[0005] To address the aforementioned problems, this invention aims to solve the issues of insufficient filtration capacity and easy clogging of screens in traditional slurry pipeline transportation, which fail to meet the technical requirements of pipeline slag transportation and affect the safety of pipeline transportation.

[0006] To achieve the above objectives, this invention relates to an automatic slag removal and safety filtration system for pipeline-transported gasification slurry, comprising a gasification slag lock hopper; a slurry pipeline is installed below the gasification slag lock hopper, the slurry pipeline is equipped with an electric discharge valve and a slag crusher, a vibrating screen is installed below the slurry pipeline, a buffer tank is installed at the bottom of the vibrating screen, the bottom of the buffer tank flows through the slurry pipeline and is connected to a wear-resistant slurry pump, the inlet and outlet pipelines of the wear-resistant slurry pump are equipped with electric knife gate valves, and a conical filter tank is also installed at the tail end of the slurry pipeline, the inside of the conical filter tank is equipped with an inclined filter screen, and the upstream side wall of the conical filter tank... An inlet pressure transmitter is installed on the top of the conical filter tank, and an outlet pressure transmitter is installed on the downstream side wall of the conical filter tank. A flushing water pipe is connected to the top of the conical filter tank, and the flushing water pipe is connected to the centrifugal pump interface. An electric stopcock valve is installed at the connection between the flushing water pipe and the conical filter tank. The bottom of the conical filter tank is connected to the discharge pipe, and an electric knife gate valve is installed at the connection between the discharge pipe and the conical filter tank. The inlet pressure transmitter, outlet pressure transmitter, electric knife gate valve, electric stopcock valve, and discharge valve are all connected to the control system (such as a PLC control system) through control cables.

[0007] Furthermore, a slag removal pool is provided along the screen surface of the vibrating screen, and a slag removal machine is installed in the slag removal pool.

[0008] Furthermore, a sweeping pit is provided at the end of the discharge pipe. Furthermore, electric knife gate valves are connected to both the upstream and downstream sides of the conical filter tank.

[0009] Furthermore, the angle of the inclined filter screen is 20-60 degrees.

[0010] Furthermore, the cone at the bottom of the conical filter tank forms an angle of °° with the horizontal.

[0011] Furthermore, an inlet pressure transmitter and an outlet pressure transmitter are respectively installed on the upstream and downstream side walls of the conical filter tank. The two pressure transmitters are interlocked to form a differential pressure gauge. The electric gate valve, electric plug valve, and discharge valve are interlocked with the differential pressure gauge through a PLC control system, and the opening and closing modes of each valve are interlocked according to the pressure difference.

[0012] Furthermore, the inlet and outlet pressure transmitters are connected to the factory's MES system via control cables. The control system has a built-in trend warning module. This module calculates the rate of pressure change based on real-time differential pressure data collected by the pressure transmitters using a dynamic weighted algorithm, predicts the risk of screen clogging, and triggers pre-processing actions. The rate of pressure change is calculated using the formula... Calculate, where: The rate of change of pressure difference serves as a core indicator for judging the trend of screen clogging. The dynamic weight for the i-th historical data collection period (e.g., the value can range from 0.1 to 0.6, satisfying...). Recent data has a higher weight than older data; for example, it can be set to... This is used to strengthen the impact of recent pressure differential changes on trend judgment; The differential pressure data for nearly n acquisition cycles is obtained from the difference between the inlet pressure transmitter and the outlet pressure transmitter data. The average historical baseline differential pressure is the average of 10 consecutive data sets taken from n data collection periods to eliminate the interference of initial differential pressure fluctuations; n is the number of historical data collection periods (range 3-5, default is 3), which balances the accuracy and real-time performance of trend judgment. This represents a single data acquisition cycle, with a value range of 2-5, and a default setting of 3 seconds, matching the sampling frequency of the pressure transmitter.

[0013] Furthermore, the pre-set warning threshold of the trend warning module is determined by an adaptive operating condition model: Determined, among which: The differential pressure change rate warning threshold is dynamically adapted to the slurry flow rate. The maximum safe differential pressure allowed by the system is determined by the equipment design parameters; k is the safety factor (range 0.3-0.5, default is 0.4), used to avoid false triggering; The allowable congestion development time can be adjusted according to production process requirements; The real-time flow rate of the slurry is collected by a flow sensor added to the slurry pipeline; Design the system to have a rated flow rate; This is a flow correction factor used to quantify the impact of flow changes on congestion risk; When the differential pressure change rate calculated by the trend early warning module is greater than the early warning threshold for at least three consecutive acquisition cycles, a pre-processing action is triggered. The pre-processing action includes the PLC control system interlocking to reduce the output speed of the wear-resistant slurry pump in the running pump-transfer filtration system until it stops, then closing all electric knife gate valves, opening the electric plug valve on the flushing water pipeline for flushing, and simultaneously switching to the standby pump-transfer filtration system, opening the electric knife gate valve in the standby system, and starting the standby wear-resistant slurry pump to ensure continuous and stable slurry delivery.

[0014] As another aspect of the present invention, a safety filtration method for an automatic slag removal safety filtration system for pipeline conveying gasification slurry is also disclosed, comprising: When the slurry pipeline is operating normally, the electric discharge valve of the slag hopper, the slag crusher, the vibrating screen, and the wear-resistant slurry pump are in the open state, the electric gate valves at the inlet and outlet of the wear-resistant slurry pump are in the open state, the electric plug valve at the flushing water pipeline is in the closed state, and the two discharge valves at the discharge pipeline are in the closed state.

[0015] The gasification slag from the gasifier slag hopper is discharged through the slurry pipeline after the discharge valve is opened. It is then crushed by the slag crusher and enters the first screening stage. Large particles of slag larger than 10mm are removed by the vibrating screen and enter the slag removal pool. This part of coarse slag is transferred by the slag removal machine. The slurry smaller than 10mm enters the buffer tank 6 and is pumped to the conical filter tank by the wear-resistant slurry pump for the second screening stage.

[0016] The flowing slurry enters the conical filter tank. Slurry with the required volume passes through the filter screen and enters the downstream. Coarse particles larger than 5mm and large-volume slag are intercepted by the inclined filter screen and enter the conical chute at the bottom, where they accumulate at the bottom of the chute and near the screen.

[0017] Pressure transmitters on the inlet and outlet walls of the filter tank monitor the pressure difference between the two ends of the filter screen in real time. The system determines the degree of blockage based on whether the pressure difference exceeds a preset value.

[0018] Coarse particles and large-volume slag continuously accumulate at the bottom of the chute and near the screen. When the pressure difference reaches the preset value, the electric valves at the inlet and outlet of the main pipeline, which are interlocked with the pressure difference through the PLC control system, automatically close, the electric plug valve in the flushing water pipeline automatically opens, and the electric knife gate valve in the discharge pipeline automatically opens.

[0019] The centrifugal pump pumps the flushing water into the filter tank, and discharges the coarse particles of slag accumulated in the conical chute into the sweeping pit.

[0020] Compared with the prior art, the present invention has the following advantages: (1) The automatic slag removal and safety filtration system for pipeline gasification slurry of the present invention is equipped with an inclined filter screen: on the one hand, during the process of transporting the slurry from the inlet end to the outlet end of the filter tank, the filter screen intercepts coarse particles and large-volume slag; on the other hand, when the flushing water enters from the top of the filter tank, the resulting impact force will flush away the stubborn particles stuck on the screen holes of the filter screen. In conjunction with the pressure transmitters on both sides of the filter tank to monitor the pressure difference between the inlet end and the outlet end in real time, the pressure difference changes are interlocked to open and close the various electric valves, realizing safe filtration and continuous automatic slag removal without stopping, protecting the stability and safety of the system.

[0021] (2) The automatic slag removal safety filtration system for pipeline gasification slurry of the present invention has a conical chute at the bottom of the filter tank, which is beneficial for coarse particles of slag to slide into the chute under the action of gravity and be stored there. This facilitates centralized rinsing and avoids the eddy current from repeatedly carrying up coarse particles of slag, thus reducing wear on the screen and tank wall.

[0022] (3) The automatic slag removal and safety filtration system for pipeline gasification slurry of the present invention adopts dynamic weighting (including historical benchmark pressure difference mean correction) to calculate the rate of pressure difference change, thereby strengthening the correlation between recent pressure difference data and the judgment of blockage trend and eliminating the interference of initial pressure difference fluctuation; adopts the pretreatment method of interlocking control of wear-resistant slurry pump to reduce speed in advance and pre-flushing with water pressure, thereby achieving precise intervention in the early stage of blockage, alleviating the screen blockage trend, avoiding damage to system equipment caused by sudden stop; and reducing water consumption and system operation fluctuation.

[0023] (4) The automatic slag removal and safety filtration system for pipeline gasification slurry of the present invention incorporates the condition-adaptive early warning threshold judgment of the real-time flow parameters of the slurry, so as to make the early warning threshold dynamically adapt to the working conditions, quantify the impact of flow changes on the risk of blockage, and reduce the probability of false or missed early warnings under different flow conditions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the automatic slag removal and safety filtration system for coarse particle slurry provided by the present invention (the arrow in the figure indicates the final slurry outlet).

[0025] In the diagram: 1-Gasification slag lock hopper, 2-Electric relief valve, 3-Slag crusher, 4-Slurry pipeline, 5-Vibrating screen, 6-Buffer tank, 7-Slag removal pool, 8-Slag removal machine, 9-Electric knife gate valve, 10-Wear-resistant slurry pump, 11-Conical filter tank, 12-Filter screen, 13-Discharge valve, 14-Discharge pipeline, 15-Sweeping pit, 16-Centrifugal pump interface, 17-Flush water pipeline, 18-Electric plug valve, 19-Inlet pressure transmitter, 20-Outlet pressure transmitter, 21-PLC control system, 22-Control cable. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Please refer to Figure 1An automatic slag removal and safety filtration system for pipeline-transported gasification slag slurry includes a gasification slag lock hopper 1; a slurry pipeline 4 is installed below the gasification slag lock hopper 1, and an electric relief valve 2 and a slag crusher 3 are installed on the slurry pipeline 4. A vibrating screen 5 is installed below the slurry pipeline 4, and a buffer tank 6 is installed at the bottom of the vibrating screen 5. The bottom of the buffer tank 6 flows through the slurry pipeline and is connected to a wear-resistant slurry pump 10. Electric knife gate valves 9 are installed on the inlet and outlet pipes of the wear-resistant slurry pump 10. A conical filter tank 11 is also installed at the tail end of the slurry pipeline 4. An inclined filter screen 12 is installed inside the conical filter tank 11 (in some preferred embodiments, the angle of the inclined filter screen 12 is 20-60 degrees). An inlet pressure transmitter 19 is installed on the upstream side wall of the conical filter tank 11. An outlet pressure transmitter 20 is installed on the downstream side wall of the filter tank 11. A flushing water pipe 17 is connected to the top of the conical filter tank 11. The flushing water pipe 17 is connected to the centrifugal pump interface 16. An electric stopcock valve 18 is installed at the connection between the flushing water pipe 17 and the conical filter tank 11. The bottom of the conical filter tank 11 is connected to the discharge pipe 14. Two electric knife gate valves 13 are installed at the connection between the discharge pipe 14 and the conical filter tank 11 (the purpose of setting two is to improve the safety factor; if one fails, the other can maintain the normal operation of the system). The inlet pressure transmitter 19, the outlet pressure transmitter 20, the electric knife gate valve 9, the electric stopcock valve 18, and the discharge valve 13 are all connected to the control system 21, such as a PLC control system, through the control cable 22.

[0028] An inlet pressure transmitter 19 and an outlet pressure transmitter 20 are installed on the upstream and downstream side walls of the conical filter tank 11, respectively. The two pressure transmitters are interlocked to form a differential pressure gauge. The electric gate valve 9, the electric plug valve 18, and the discharge valve 13 are interlocked with the differential pressure gauge through the PLC control system 21, and the opening and closing modes of each valve are interlocked according to the pressure difference.

[0029] In some preferred embodiments, a slag removal pool 7 is provided along the screen surface of the vibrating screen 5, and a slag removal machine 8 is installed in the slag removal pool 7, which further improves the utilization rate of coarse slag materials.

[0030] A sweeping pit 15 is provided at the end of the discharge pipe 14. A slag classification and collection device can be added in front of the sweeping pit, such as secondary screening and recycling of 510mm coarse slag, which can be reused as building aggregate.

[0031] Electric knife gate valves 9 are connected to both the upstream and downstream sides of the conical filter tank 11.

[0032] The cone-shaped filter tank 11 has a cone-shaped bottom with an angle of 30° to 60° with the horizontal.

[0033] In some preferred embodiments, the rate of change of differential pressure is also calculated by using a dynamically weighted average of historical baseline differential pressure, and an adaptive early warning threshold is set to predict blockage trends in advance. To avoid damage to system equipment and operation caused by sudden stops and shutdowns, the specific method is as follows: The inlet pressure transmitter 19 and outlet pressure transmitter 20 are connected to the factory's MES system via control cable 22. The control system 21 has a built-in trend early warning module. Based on the real-time differential pressure data collected by the pressure transmitters, the trend early warning module calculates the rate of differential pressure change using a dynamic weighted algorithm, predicts the risk of screen blockage, and triggers pre-treatment actions. The rate of differential pressure change is calculated using the formula... Calculate, where: The rate of change of pressure difference serves as a core indicator for judging the trend of screen clogging. The dynamic weight for the i-th historical data collection period (within the range of 0.1-0.6, satisfying...) Recent data has a higher weight than older data; for example, it can be set to... This is used to strengthen the impact of recent pressure differential changes on trend judgment; The differential pressure data for nearly n acquisition cycles is obtained from the difference between the inlet pressure transmitter and the outlet pressure transmitter data. The average historical baseline differential pressure is the average of 10 consecutive data sets taken from n data collection periods to eliminate the interference of initial differential pressure fluctuations; n is the number of historical data collection periods (range 3-5, default is 3), which balances the accuracy and real-time performance of trend judgment. This represents a single data acquisition cycle, with a value range of 2-5, and a default setting of 3 seconds, matching the sampling frequency of the pressure transmitter.

[0034] In some preferred embodiments, the pre-set warning threshold of the trend warning module is determined by an adaptive operating condition model: Determined, among which: The differential pressure change rate warning threshold is dynamically adapted to the slurry flow rate. The maximum safe differential pressure allowed by the system is determined by the equipment design parameters; k is the safety factor (range 0.3-0.5, default is 0.4), used to avoid false triggering; The allowable congestion development time can be adjusted according to production process requirements; The real-time flow rate of the slurry is collected by a flow sensor added to the slurry pipeline; Design the system to have a rated flow rate; This is a flow correction factor used to quantify the impact of flow changes on congestion risk; When the differential pressure change rate calculated by the trend early warning module is greater than the early warning threshold for at least three consecutive acquisition cycles, a pre-processing action is triggered. The pre-processing action includes the PLC control system 21 interlocking to reduce the output speed of the wear-resistant slurry pump 10 in the running pump-transfer filtration system until it stops, then closing all electric gate valves 9, and then opening the electric stop valve 18 on the flushing water pipeline 17 for flushing. At the same time, the system switches to the standby pump-transfer filtration system (not shown in the figure, which includes the entire pipeline equipment from the wear-resistant slurry pump 10 to the electric gate valve 9 at the end of the slurry outlet), opens the electric gate valve 9 in the standby system, and starts the standby wear-resistant slurry pump 10 to ensure continuous and stable slurry delivery.

[0035] If, after pretreatment, the differential pressure change rate calculated by the trend warning module is still greater than the warning threshold, the PLC control system 21 automatically switches to normal flushing and slag discharge mode, that is, it controls the main pipeline inlet and outlet electric valves to close, the flushing water pipeline valves to fully open, and the discharge pipeline valves to fully open, so as to discharge the coarse particles of slag accumulated in the conical chute to the sweeping pit 15; wherein, the differential pressure change rate after pretreatment needs to be corrected in combination with the flushing attenuation coefficient, and the correction method is as follows: , The rinsing attenuation coefficient is... This refers to the actual duration of a light rinse. Set the maximum time for a light rinse.

[0036] As another aspect of the present invention, a safety filtration method for an automatic slag removal safety filtration system for pipeline conveying gasification slurry is also disclosed, comprising: When the slurry pipeline is operating normally, the electric discharge valve of the slag hopper, the slag crusher, the vibrating screen, and the wear-resistant slurry pump are in the open state, the electric gate valves at the inlet and outlet of the wear-resistant slurry pump are in the open state, the electric plug valve at the flushing water pipeline is in the closed state, and the two discharge valves at the discharge pipeline are in the closed state.

[0037] In other words, under normal circumstances, all electric gate valves 9 in the system are open; electric stop valves 18 and discharge valves 13 are closed. The slurry is filtered through the filter screen 12, and the coarse slag is filtered and piled up at the bottom of the conical filter tank 11. When the outlet pressure transmitter 20 detects an excessive pressure difference, it indicates that there is too much slag. At this time, the slurry pump is stopped, all electric gate valves 9 are closed, electric stop valves 18 and discharge valves 13 are opened, and the centrifugal pump interface 16 is connected to water to flush the slag into the sweeping pit 15. Then, all electric gate valves 9 are opened again; electric stop valves 18 and discharge valves 13 are closed to restore normal operation.

[0038] The gasification slag from the gasifier slag hopper is discharged through the slurry pipeline after the discharge valve is opened. It is then crushed by the slag crusher and enters the first screening stage. Large particles of slag larger than 10mm are removed by the vibrating screen 5 and enter the slag removal pool 7. This part of coarse slag is transferred by the slag removal machine 7. The slurry smaller than 10mm enters the buffer tank 6 and is pumped by the wear-resistant slurry pump 10 to the conical filter tank 11 for the second screening stage.

[0039] The flowing slurry enters the conical filter tank 11. Slurry with the required volume passes through the filter screen and enters the downstream. Coarse particles larger than 5mm and large-volume slag are intercepted by the inclined filter screen and enter the conical chute at the bottom, where they accumulate at the bottom of the chute and near the screen.

[0040] Pressure transmitters on the inlet and outlet walls of the filter tank monitor the pressure difference between the two ends of the filter screen in real time. The system determines the degree of blockage based on whether the pressure difference exceeds a preset value.

[0041] Coarse particles and large-volume slag continuously accumulate at the bottom of the chute and near the screen. When the pressure difference reaches the preset value, the electric valves at the inlet and outlet of the main pipeline, which are interlocked with the pressure difference through the PLC control system, automatically close, the electric plug valve in the flushing water pipeline automatically opens, and the electric knife gate valve in the discharge pipeline automatically opens.

[0042] The centrifugal pump pumps the flushing water into the filter tank, and discharges the coarse particles of slag accumulated in the conical chute into the sweeping pit.

[0043] In some other preferred embodiments, a high-pressure pulse flushing nozzle can be added to the top of the conical filter tank to form a dual mode of continuous flushing + pulse impact with the original flushing water pipe, which can precisely target stubborn clogging particles; at the same time, a wear-resistant ceramic coating is sprayed on the screen surface, and replaceable wear-resistant liners are installed in the easily worn areas of the tank wall to extend the service life of the core components.

[0044] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic slag removal and safety filtration system for pipeline-transported gasification slurry, characterized in that: The system includes a gasification slag lock hopper (1); a slurry pipe (4) is installed below the gasification slag lock hopper (1), an electric discharge valve (2) and a slag crusher (3) are installed on the slurry pipe (4), a vibrating screen (5) is installed below the slurry pipe (4), a buffer tank (6) is installed at the bottom of the vibrating screen (5), the bottom of the buffer tank (6) flows through the slurry pipe and is connected to the wear-resistant slurry pump (10), the inlet and outlet pipes of the wear-resistant slurry pump (10) are equipped with electric knife gate valves (9), a conical filter tank (11) is also installed at the tail of the slurry pipe (4), an inclined filter screen (12) is installed inside the conical filter tank (11), an inlet pressure transmitter (19) is installed on the upstream side wall of the conical filter tank (11), and a pressure transmitter (19) is installed on the downstream side wall of the conical filter tank (11). An outlet pressure transmitter (20) is installed. A flushing water pipe (17) is connected to the top of the conical filter tank (11). The flushing water pipe (17) is connected to the centrifugal pump interface (16). An electric stop valve (18) is installed at the connection between the flushing water pipe (17) and the conical filter tank (11). The bottom of the conical filter tank (11) is connected to the discharge pipe (14). Two electric knife gate valves (13) are installed at the connection between the discharge pipe (14) and the conical filter tank (11). The inlet pressure transmitter (19), outlet pressure transmitter (20), electric knife gate valve (9), electric stop valve (18), and discharge valve (13) are all connected to the control system (21) (e.g., a PLC control system) via control cables (22).

2. The automatic slag removal and safety filtration system for pipeline gasification slurry as described in claim 1, characterized in that, A slag removal pool (7) is provided along the screen surface of the vibrating screen (5), and a slag removal machine (8) is provided in the slag removal pool (7).

3. The automatic slag removal and safety filtration system for pipeline-transported gasification slurry as described in claim 1, characterized in that, A sweeping pit (15) is provided at the end of the discharge pipe (14).

4. The automatic slag removal and safety filtration system for pipeline-transported gasification slurry as described in claim 1, characterized in that, Electric knife gate valves (9) are connected to both the upstream and downstream sides of the conical filter tank (11).

5. The automatic slag removal and safety filtration system for pipeline-transported gasification slurry as described in claim 1, characterized in that, The angle of the inclined filter screen (12) is 20-60 degrees.

6. The automatic slag removal and safety filtration system for pipeline-transported gasification slurry as described in claim 1, characterized in that, The cone-shaped filter tank (11) has a cone-shaped bottom with an angle of 30°-60° with the horizontal.

7. The automatic slag removal and safety filtration system for pipeline-transported gasification slurry as described in claim 1, characterized in that, The conical filter tank (11) is equipped with an inlet pressure transmitter (19) and an outlet pressure transmitter (20) on its upstream and downstream side walls, respectively. The two pressure transmitters are interlocked to form a differential pressure gauge. The electric gate valve (9), electric plug valve (18), and discharge valve (13) are interlocked with the differential pressure gauge through the PLC control system (21) and the opening and closing modes of each valve are interlocked according to the pressure difference.

8. The automatic slag removal and safety filtration system for pipeline gasification slurry as described in claim 1, characterized in that, The inlet pressure transmitter (19) and outlet pressure transmitter (20) are connected to the factory's MES system via control cable (22). The control system (21) has a built-in trend warning module. The trend warning module calculates the rate of change of pressure difference based on the real-time differential pressure data collected by the pressure transmitters using a dynamic weighted algorithm, predicts the risk of screen blockage, and triggers pre-processing actions. The rate of change of pressure difference is calculated by... Calculate, where: The rate of change of pressure difference serves as a core indicator for judging the trend of screen clogging. The dynamic weight for the i-th historical data collection period is used to enhance the impact of recent pressure difference changes on trend judgment. The differential pressure data for nearly n acquisition cycles is obtained from the difference between the inlet pressure transmitter and the outlet pressure transmitter data. The average historical baseline differential pressure is the average of 10 consecutive data sets taken from n data collection periods to eliminate the interference of initial differential pressure fluctuations; n is the number of historical data collection periods, which balances the accuracy and real-time performance of trend judgment. This is a single data acquisition cycle, with a value range of 2-5, and a default setting of 3s, which matches the sampling frequency of the pressure transmitter.

9. The automatic slag removal and safety filtration system for pipeline gasification slurry as described in claim 8, characterized in that, The trend early warning module's preset early warning threshold is determined by the operating condition adaptive model: Confirmed, among which: The differential pressure change rate warning threshold is dynamically adapted to the slurry flow rate. The maximum allowable safe differential pressure of the system is determined by the equipment design parameters; k is the safety factor used to avoid false triggering. The allowable congestion development time can be adjusted according to production process requirements; The real-time flow rate of the slurry is collected by a flow sensor added to the slurry pipeline; Design the system to have a rated flow rate; This is a flow correction factor used to quantify the impact of flow changes on congestion risk; When the differential pressure change rate calculated by the trend warning module is greater than the warning threshold for at least three consecutive collection cycles, a pre-processing action is triggered. The pre-processing action includes the PLC control system (21) interlocking to control the wear-resistant slurry pump (10) in the running pumping and filtration system to reduce the output speed until it stops, then close all electric knife gate valves (9), and then open the electric plug valve (18) on the flushing water pipeline (17) for flushing. At the same time, switch to the standby pumping and filtration system, open the electric knife gate valve (9) in the standby system, and start the standby wear-resistant slurry pump (10) to ensure continuous and stable slurry delivery.

10. The safety filtration method of the automatic slag removal and safety filtration system for pipeline gasification slurry as described in any one of claims 1-9, characterized in that, include: When the slurry pipeline is operating normally, the electric discharge valve of the slag hopper, the slag crusher, the vibrating screen, and the wear-resistant slurry pump are in the open state, the electric gate valves at the inlet and outlet of the wear-resistant slurry pump are in the open state, the electric plug valve at the flushing water pipeline is in the closed state, and the two discharge valves at the discharge pipeline are in the closed state. The gasification slag from the gasifier slag hopper is discharged through the slurry pipeline after the discharge valve is opened. It is crushed by the slag crusher and then enters the first screening stage. Large particles of slag larger than 10mm are screened out by the vibrating screen (5) and enter the slag removal pool (7). This part of coarse slag is transferred by the slag removal machine (7). The slurry smaller than 10mm enters the buffer tank (6) and is pumped by the wear-resistant slurry pump (10) to the conical filter tank (11) for the second screening. The flowing slurry enters the conical filter tank 11. The slurry with the required volume passes through the filter screen and enters the downstream. Coarse particles larger than 5mm and large slag are intercepted by the inclined filter screen and enter the conical chute at the bottom, where they accumulate at the bottom of the chute and near the screen. Pressure transmitters on the inlet and outlet walls of the filter tank monitor the pressure difference between the two ends of the filter screen in real time. The system determines the degree of blockage based on whether the pressure difference exceeds the preset value. Coarse particles and large-volume slag continuously accumulate at the bottom of the chute and near the screen. When the pressure difference reaches the preset value, the electric valves at the inlet and outlet of the main pipeline, which are interlocked with the pressure difference through the PLC control system, automatically close, the electric plug valve in the flushing water pipeline automatically opens, and the electric knife gate valve in the discharge pipeline automatically opens. The centrifugal pump pumps the flushing water into the filter tank, and discharges the coarse particles of slag accumulated in the conical chute into the sweeping pit.

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