A continuous slag discharge device and slag discharge method for a fluidized bed gasifier

Abstract

The present invention discloses a continuous slag discharge device and a slag discharge method for a fluidized bed gasifier, wherein the slag discharge device comprises a slag discharge tank, a slag discharge channel, a slag pool, a water source, a clean water pool and a first slag discharge pipe; the first slag discharge pipe is fixedly and obliquely penetrated on the side wall below the slag discharge tank; the slag inlet end of the first slag discharge pipe is located at the bottom of the slag discharge tank, and the slag outlet end of the first slag discharge pipe is connected to the slag inlet of the slag pool through a pipeline; the method comprises the following steps: (1) the ash slag is settled below the slag discharge tank; (2) the ash slag solution is squeezed from the first slag discharge pipe into the slag pool. Beneficial effects: The slag discharge device of the present invention has a simple structure and is easy to implement; the slag discharge system is simplified, thereby reducing the investment in equipment and the slag discharge cost; the slag discharge process is simplified and the slag discharge efficiency is improved; the slag discharge amount of the gasifier can be accurately controlled; the reuse of water resources is realized and the waste of water resources is avoided.

Description

Technical Field:

[0001] This invention patent belongs to the technical field of slag discharge of fluidized bed gasifiers, and particularly relates to a continuous slag discharge device for a fluidized bed gasifier and a slag discharge method therefor. Background Art:

[0002] Common slag discharge methods for fluidized bed gasifiers currently include two types: fixed bed dry slag discharge method and wet slag discharge method; the slag discharge systems of the above two methods both include a slag receiving tank (or high-pressure slag tank), a variable-pressure slag tank, and a low-pressure slag tank that are connected in sequence through valves. Among them, dry slag discharge is to set a central gas pipe in the slag receiving tank, and the central gas pipe extends into the lower slag channel of the gasifier, and the slag discharge is carried out by means of gas control, that is, by controlling the gas volume in the lower slag channel of the gasifier to control the slag discharge rate. The biggest disadvantage of the dry slag discharge system is that its operation is very difficult, and the central gas pipe is severely worn, and even leakage may occur, causing overheating and slagging inside the lower slag channel of the gasifier, and the stability of system operation is poor; moreover, the slag discharge temperature of dry slag discharge is high, the temperature resistance requirement for the slag discharge valve is relatively high, the slag discharge pipe is easily worn and leaked, and because a large amount of dust and steam are carried in the pressure relief gas, the on-site pollution is serious.

[0003] Wet slag discharge is that the ash slag is discharged from the slag dropping pipe at the bottom of the gasifier to the slag receiving tank and the variable-pressure slag tank and cooled by the quench water. Although the temperature of the slag discharge system is relatively low and the environmental pollution is also relatively small, it is difficult to accurately control the slag discharge amount, which makes the slag discharge control of the gasifier difficult; and this slag discharge method requires continuous injection of quench water, and the slag water discharge amount is large, which leads to a large water consumption, and various process pipelines of the slag discharge system are extremely easy to be blocked, resulting in unstable production.

[0004] Moreover, both traditional dry slag discharge and wet slag discharge need to adopt an intermittent slag discharge method, and the high-pressure ash slag needs to be continuously depressurized before being discharged. The system is complex, the slag discharge process is cumbersome, and the slag discharge efficiency is low. Summary of the Invention:

[0005] The first object of the present invention is to provide a continuous slag discharge device for a fluidized bed gasifier with a simple structure and reduced slag discharge cost.

[0006] The second object of the present invention is to provide a slag discharge method that realizes controllable slag discharge amount and has a simple process method.

[0007] On one hand, the technical solution of the present invention discloses a continuous slag discharging device for a fluidized bed gasifier, which includes a slag discharging tank, a slag discharging channel, a slag pool, a water source, a clean water tank and a first slag discharging pipe; the slag discharging channel is fixedly penetrated through the top of the slag discharging tank, and the top end of the slag discharging channel is communicated with the slag discharging port of the gasifier; the slag discharging port at the bottom of the slag discharging tank is communicated with the slag inlet of the slag pool through a pipeline; a drain valve is arranged on the pipeline between the slag discharging tank and the slag pool; the overflow port of the slag pool and the water source are both communicated with the water inlet of the clean water tank; the water outlet of the clean water tank is communicated with the water inlet of a circulation pump, and the water outlet of the circulation pump is communicated with the water inlet of the slag discharging tank; the first slag discharging pipe is fixedly penetrated through the side wall below the slag discharging tank obliquely; the slag inlet end of the first slag discharging pipe is located at the bottom inside the slag discharging tank, and the slag outlet end of the first slag discharging pipe is communicated with the slag inlet of the slag pool through a pipeline; a first quick-opening valve is arranged on the first slag discharging pipe; a first pressure reducing angle valve is arranged on the pipeline between the first slag discharging pipe and the slag pool.

[0008] Further, a plurality of inner spray heads are fixedly arranged on the inner wall of the slag discharging channel above the slag discharging tank; a plurality of outer spray heads are arranged outside the slag discharging channel above the slag discharging tank; the water inlets of the inner spray heads and the outer spray heads are respectively communicated with the water outlet of the circulation pump; an inner spray control valve is arranged on the pipeline between the inner spray head and the circulation pump; an outer spray control valve is arranged on the pipeline between the outer spray head and the circulation pump.

[0009] Further, the lower end of the slag discharging channel is in a flared shape.

[0010] Further, a second slag discharging pipe is fixedly penetrated through the side wall of the slag discharging tank obliquely; the slag inlet end of the second slag discharging pipe is located above the slag inlet end of the first slag discharging pipe, and the slag outlet end of the second slag discharging pipe is communicated with the slag inlet of the slag pool through a pipeline; a second quick-opening valve is arranged on the second slag discharging pipe; a second pressure reducing angle valve is arranged on the pipeline between the second slag discharging pipe and the slag pool.

[0011] Further, the water outlet of the circulation pump is respectively communicated with the slag outlet ends of the first slag discharging pipe and the second slag discharging pipe through pipelines; a first flushing valve is arranged on the pipeline between the circulation pump and the first slag discharging pipe; a second flushing valve is arranged on the pipeline between the circulation pump and the second slag discharging pipe.

[0012] Further, a temperature sensor is arranged on the slag discharging tank, and the signal output end of the temperature sensor is signal-connected to the signal input end of a controller; the signal output end of the controller is respectively signal-connected to the signal input ends of the inner spray control valve and the outer spray control valve.

[0013] Furthermore, a liquid level sensor is provided on the slag discharge tank, and the signal output end of the liquid level sensor is signal-connected to the signal input end of the controller; the signal output end of the controller is respectively signal-connected to the signal input ends of the first quick-opening valve, the first pressure-reducing angle valve, the second quick-opening valve, the second pressure-reducing angle valve, the first flushing valve and the second flushing valve.

[0014] Another aspect of the present invention also discloses a slag discharge method, which includes the following steps:

[0015] (1) The ash slag falls onto the surface of the solution from the lower slag passage, and at the same time, the inner spray head in the lower slag passage sprays water, and the ash slag settles to the lower part of the slag discharge tank;

[0016] (2) Open the first quick-opening valve and the first pressure-reducing angle valve, and under the action of pressure, the ash slag solution in the lower part of the slag discharge tank is extruded into the slag pool through the first slag discharge pipe.

[0017] Furthermore, the speed at which the ash slag falls onto the solution surface is V1; the sedimentation speed in the static solution is V2; when the inner spray head sprays water, the speed at which the solution flows towards the bottom of the slag discharge tank is V3; when V1 > V2 + V3, the slag discharge speed of the gasifier is relatively low, and thus the slag discharge amount is relatively small; when V1 = V2 + V3, the slag discharge speed of the gasifier is moderate, and thus the slag discharge amount is moderate; when V1 < V2 + V3, the slag discharge speed of the gasifier is relatively fast, and thus the slag discharge amount is relatively large; V1 and V2 are invariant; V3 is a variable, that is, the size of V3 can be controlled by adjusting the opening degree of the inner spray control valve and the opening degree of the first pressure-reducing angle valve.

[0018] Furthermore, the liquid level sensor in the slag discharge tank constantly detects the liquid level height of the solution in the slag discharge tank. Once the liquid level is higher than the upper limit value, the liquid level sensor will transmit a signal to the controller, and the controller controls the first pressure-reducing angle valve to open wider; once the liquid level is lower than the lower limit value, the liquid level sensor will transmit a signal to the controller, and the controller controls the first pressure-reducing angle valve to open smaller.

[0019] Advantages of the present invention:

[0020] 1. The slag discharge device of the present invention has a simple structure and is easy to implement; after the ash slag in the gasifier is discharged from the lower slag passage into the slag discharge tank, it is directly discharged into the slag pool through the pressure reduction discharge of the first slag discharge pipe, simplifying the slag discharge system, thereby reducing the equipment investment and lowering the slag discharge cost;

[0021] 2. The ash slag solution at the bottom of the slag discharge tank is discharged into the slag pool from high pressure to low pressure through the continuous pressure reduction of the first slag discharge pipe, simplifying the slag discharge process and improving the slag discharge efficiency; solving the problem that the pipeline is extremely easy to be blocked during the wet slag discharge process, and ensuring the stability of production;

[0022] 3. The water sprayed and the solution flowing downward in the slag discharge tank can quickly carry the ash slag and its heat to the bottom of the slag discharge tank, thereby quickly reducing the temperature of the ash slag, making the temperature in the slag discharge tank uniform, and effectively solving the problems of high slag discharge temperature and easy leakage of gas polluting the environment during the dry slag discharge process;

[0023] 4. By controlling the opening degrees of the internal spray control valve and the first reducing angle valve, the downward flow rate of the solution in the slag discharge tank is controlled, thereby realizing the control of the slag discharge rate and slag discharge amount of the gasifier, and the slag discharge amount of the gasifier can be accurately controlled;

[0024] 5. The ash slag in the ash slag solution in the slag pool settles to the bottom of the slag pool, and the supernatant overflows into the clear water pool and is re-transported to the slag discharge tank as cooling water through the circulation pump, realizing the reuse of water resources and avoiding the waste of water resources. Description of the drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present invention.

[0026] Figure 2 It is a control schematic diagram of the embodiment of the present invention.

[0027] Slag discharge tank 1, lower slag channel 2, slag pool 3, water source 4, clear water pool 5, first slag discharge pipe 6, gasifier 7, drain valve 8, circulation pump 9, first quick-opening valve 10, first reducing angle valve 11, internal spray head 12, external spray head 13, internal spray control valve 14, external spray control valve 15, second slag discharge pipe 16, second quick-opening valve 17, second reducing angle valve 18, first flushing valve 19, second flushing valve 20, temperature sensor 21, liquid level sensor 22, controller 23. Specific embodiments:

[0028] The present invention will be further described in detail below with reference to the drawings through embodiments.

[0029] Example 1: As Figure 1-2As shown in the figure, a continuous slag discharging device for a fluidized bed gasifier 7 includes a slag discharging tank 1, a slag discharging channel 2, a slag pool 3, a water source 4, a clear water tank 5 and a first slag discharging pipe 6. A slag discharging channel 2 is fixedly penetrated through the top of the slag discharging tank 1, and the top end of the slag discharging channel 2 is communicated with the slag discharging port of the gasifier 7. The slag discharging port at the bottom of the slag discharging tank 1 is communicated with the slag inlet of the slag pool 3 through a pipeline. A drain valve 8 is arranged on the pipeline between the slag discharging tank 1 and the slag pool 3. The overflow port of the slag pool 3 and the water source 4 are both communicated with the water inlet of the clear water tank 5. The water outlet of the clear water tank 5 is communicated with the water inlet of a circulating pump 9, and the water outlet of the circulating pump 9 is communicated with the water inlet of the slag discharging tank 1. A first slag discharging pipe 6 is obliquely and fixedly penetrated through the side wall below the slag discharging tank 1. The slag inlet end of the first slag discharging pipe 6 is located at the bottom inside the slag discharging tank 1, and the slag outlet end of the first slag discharging pipe 6 is communicated with the slag inlet of the slag pool 3 through a pipeline. A first quick-opening valve 10 is arranged on the first slag discharging pipe 6. A first pressure reducing angle valve 11 is arranged on the pipeline between the first slag discharging pipe 6 and the slag pool 3.

[0030] A plurality of inner spray nozzles 12 are fixedly arranged on the inner wall of the slag discharging channel 2 above the slag discharging tank 1. A plurality of outer spray nozzles 13 are arranged outside the slag discharging channel 2 above the slag discharging tank 1. The water inlets of the inner spray nozzles 12 and the outer spray nozzles 13 are respectively communicated with the water outlet of the circulating pump 9. An inner spray control valve 14 is arranged on the pipeline between the inner spray nozzle 12 and the circulating pump 9. An outer spray control valve 15 is arranged on the pipeline between the outer spray nozzle 13 and the circulating pump 9. The lower end of the slag discharging channel 2 is in a flared shape, which is used to limit the downward movement path of the ash slag in the solution and ensure the slag discharging effect.

[0031] A second slag discharging pipe 16 is obliquely and fixedly penetrated through the side wall of the slag discharging tank 1. The slag inlet end of the second slag discharging pipe 16 is located above the slag inlet end of the first slag discharging pipe 6, and the slag outlet end of the second slag discharging pipe 16 is communicated with the slag inlet of the slag pool 3 through a pipeline. A second quick-opening valve 17 is arranged on the second slag discharging pipe 16. A second pressure reducing angle valve 18 is arranged on the pipeline between the second slag discharging pipe 16 and the slag pool 3.

[0032] The water outlet of the circulating pump 9 is respectively communicated with the slag outlet ends of the first slag discharging pipe 6 and the second slag discharging pipe 16 through pipelines. A first flushing valve 19 is arranged on the pipeline between the circulating pump 9 and the first slag discharging pipe 6. A second flushing valve 20 is arranged on the pipeline between the circulating pump 9 and the second slag discharging pipe 16.

[0033] A temperature sensor 21 is arranged on the slag discharging tank 1. The signal output end of the temperature sensor 21 is signal-connected to the signal input end of a controller 23. The signal output end of the controller 23 is respectively signal-connected to the signal input ends of the inner spray control valve 14 and the outer spray control valve 15.

[0034] A liquid level sensor 22 is provided on the slag discharge tank 1, and the signal output end of the liquid level sensor 22 is signal-connected to the signal input end of the controller 23; the signal output end of the controller 23 is respectively signal-connected to the signal input ends of the first quick-opening valve 10, the first pressure-reducing angle valve 11, the second quick-opening valve 17, the second pressure-reducing angle valve 18, the first flushing valve 19 and the second flushing valve 20.

[0035] The slag discharge device of the present invention has a simple structure and is easy to implement; after the ash slag in the gasifier 7 is discharged into the slag discharge tank 1 from the lower slag channel 2, it is directly discharged into the slag pond 3 through the pressure reduction discharge of the first slag discharge pipe 6, simplifying the slag discharge system, thereby reducing the equipment investment and lowering the slag discharge cost.

[0036] Embodiment 2: The slag discharge method using the slag discharge device of Embodiment 1 includes the following steps:

[0037] (1) The ash slag falls onto the solution surface from the lower slag channel 2 and forms a scum layer. At the same time, the internal spray head 12 in the lower slag channel 2 sprays water, and the sprayed water carries the scum layer to quickly settle, causing the ash slag to settle to the lower part of the slag discharge tank 1;

[0038] (2) Open the first quick-opening valve 10 and the first pressure-reducing angle valve 11. Under the action of pressure, the ash slag solution in the lower part of the slag discharge tank 1 is extruded into the slag pond 3 through the first slag discharge pipe 6; the ash slag solution at the bottom of the slag discharge tank 1 is discharged from high pressure to low pressure into the slag pond 3 through the continuous pressure reduction of the first slag discharge pipe 6, simplifying the slag discharge process and improving the slag discharge efficiency; solving the problem that the pipeline is extremely easy to be blocked during the wet slag discharge process and ensuring the stable production.

[0039] The speed at which the ash slag falls onto the solution surface is V1; the sedimentation speed in the static solution is V2; when the internal spray head 12 sprays water, the speed at which the solution flows towards the bottom of the slag discharge tank 1 is V3; when V1 > V2 + V3, the slag discharge speed of the gasifier 7 is relatively low, and thus the slag discharge amount is relatively small; when V1 = V2 + V3, the slag discharge speed of the gasifier 7 is moderate, and thus the slag discharge amount is moderate; when V1 < V2 + V3, the slag discharge speed of the gasifier 7 is relatively fast, and thus the slag discharge amount is relatively large; V1 and V2 are invariant quantities; V3 is a variable quantity, that is, the magnitude of V3 can be controlled by adjusting the opening degree of the internal spray control valve 14 and the opening degree of the first pressure-reducing angle valve 11; when the gasifier 7 needs to reduce the slag discharge amount, the controller 23 controls the internal spray control valve 14 and the first pressure-reducing angle valve 11 to open smaller; at the same time, the controller 23 also needs to control the external spray control valve 15 to open larger so that the total flow rate of the water coming out of the circulation pump 9 remains unchanged to ensure the stable operation of the circulation pump 9; similarly, when it is necessary to increase the slag discharge amount, the controller 23 controls the internal spray control valve 14 and the first pressure-reducing angle valve 11 to open larger; at the same time, control the external spray control valve 15 to open smaller; realizing the control of the slag discharge speed and the slag discharge amount of the gasifier 7, and the slag discharge amount of the gasifier 7 can be accurately controlled.

[0040] The internal spray head 12 above in the slag discharge tank 1 sprays water, and the first slag discharge pipe 6 below in the slag discharge tank 1 discharges the ash slag solution, causing the ash slag solution in the slag discharge tank 1 to flow from top to bottom; the sprayed water and the solution flowing from top to bottom in the slag discharge tank 1 can quickly carry the ash slag and its heat to the bottom of the slag discharge tank 1, thereby quickly reducing the temperature of the ash slag, making the temperature in the slag discharge tank 1 uniform, and effectively solving the problems of high slag discharge temperature and easy leakage of gas polluting the environment during the dry slag discharge process.

[0041] The temperature sensor 21 in the slag discharge tank 1 continuously detects the temperature of the solution in the slag discharge tank 1. Once the temperature is higher than the upper limit value, the temperature sensor 21 will transmit a signal to the controller 23, and the controller 23 controls the internal spray control valve 14 and the external spray control valve 15 to open wider to increase the spray water volume for cooling; once the temperature drops to the set temperature range, the controller 23 controls the internal spray control valve 14 and the external spray control valve 15 to return to their original states.

[0042] The liquid level sensor 22 in the slag discharge tank 1 continuously detects the liquid level height of the solution in the slag discharge tank 1. Once the liquid level is higher than the upper limit value, the liquid level sensor 22 will transmit a signal to the controller 23, and the controller 23 controls the first pressure reducing angle valve 11 to open wider; once the liquid level is lower than the lower limit value, the liquid level sensor 22 will transmit a signal to the controller 23, and the controller 23 controls the first pressure reducing angle valve 11 to open smaller.

[0043] When the first slag discharge pipe 6 fails, the controller 23 controls the first quick-opening valve 10 and the first pressure reducing angle valve 11 to close, and at the same time controls the second quick-opening valve 17 and the second pressure reducing angle valve 18 to open, starting the second slag discharge pipe 16 for continuous slag discharge; at the same time, the controller 23 controls the first flushing valve 19 to open, and conveys clear water into the first slag discharge pipe 6 through the circulation pump 9 to conduct back flushing on it. After flushing for a certain period of time, the control valve controls the first flushing valve 19 to close, and then repairs the first slag discharge pipe 6. After it is repaired, it is put into standby.

[0044] After the ash slag solution in the slag pool 3 undergoes precipitation and separation, the ash slag precipitates to the bottom of the slag pool 3 and is transported out, and the supernatant overflows into the clear water pool 5 and is re-conveyed to the slag discharge tank 1 as cooling water through the circulation pump 9, realizing the reuse of water resources and avoiding the waste of water resources.

[0045] During the startup period of the gasifier 7, the ash slag solution in the slag discharge tank 1 does not need to be drained completely. After the gasifier 7 stops, the internal spray control valve 14, the external spray control valve 15, the first pressure reducing angle valve 11, the first quick-opening valve 10 and the circulation pump 9 are closed, and the drain valve 8 is opened to drain all the ash slag solution in the slag discharge tank 1 into the slag pool 3, and the inside of the slag discharge tank 1 is cleaned.

[0046] The above are the preferred embodiments of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A continuous slag removal method for a fluidized bed gasifier, characterized in that: The specific steps include: (1) The ash falls from the slag discharge channel to the surface of the solution. At the same time, the internal spray head in the slag discharge channel sprays water, and the ash settles to the bottom of the slag discharge tank; (2) Open the first quick-opening valve and the first pressure-reducing angle valve. Under the action of pressure, the ash solution at the bottom of the slag discharge tank is squeezed from the first slag discharge pipe into the slag pool; Among them, the speed at which the ash falls to the surface of the solution is V1; the sedimentation speed in the static solution is V2; when the internal spray control valve and the first pressure reducing angle valve are opened, the speed at which the solution flows to the bottom of the slag discharge tank is V3; When V1>V2+V3, the slag discharge speed of the gasifier is low, and the slag discharge amount is small; when V1=V2+V3, the slag discharge speed of the gasifier is moderate, and the slag discharge amount is moderate; when V1<V2+V3, the slag discharge speed of the gasifier is fast, and the slag discharge amount is large; V1 and V2 are constants; V3 is a variable, that is, the size of V3 can be controlled by adjusting the opening of the internal spray control valve and the opening of the first pressure reducing angle valve; The continuous slag discharge device for realizing the continuous slag discharge method comprises a slag discharge tank, a slag discharge channel, a slag pool, a water source, a clean water pool and a first slag discharge pipe; The slag lowering channel is fixedly penetrated through the top of the slag discharge pot, and the top end of the slag lowering channel is communicated with the slag discharge port of the gasifier; The slag outlet at the bottom of the slag discharge pot is connected to the slag inlet of the slag pool through a pipeline; a drain valve is provided on the pipeline between the slag discharge pot and the slag pool; The overflow port of the slag pool and the water source are both connected to the water inlet of the clean water pool; the water outlet of the clean water pool is connected to the water inlet of the circulation pump, and the water outlet of the circulation pump is connected to the water inlet of the slag discharge tank; The first slag discharge pipe is fixedly and obliquely penetrated on the side wall below the slag discharge pot; the slag inlet end of the first slag discharge pipe is located at the bottom of the slag discharge pot, and the slag outlet end of the first slag discharge pipe is connected with the slag inlet of the slag pool through a pipeline; a first quick-opening valve is arranged on the first slag discharge pipe; a first pressure reducing angle valve is arranged on the pipeline between the first slag discharge pipe and the slag pool; A plurality of inner spray heads are fixedly arranged on the inner wall of the slag lowering channel above the slag discharge pot; a plurality of outer spray heads are arranged outside the slag lowering channel above the slag discharge pot; The water inlets of the inner spray head and the outer spray head are respectively connected to the water outlet of the circulation pump; An inner spray control valve is arranged on the pipeline between the inner spray head and the circulation pump; an outer spray control valve is arranged on the pipeline between the outer spray head and the circulation pump.

2. The continuous slag removal method of a fluidized bed gasifier according to claim 1, characterized in that: The lower end of the slag lowering channel is in a bell-mouth shape.

3. The continuous slag removal method of a fluidized bed gasifier according to claim 1, characterized in that: A second slag discharge pipe is fixedly and obliquely penetrated on the side wall of the slag discharge pot; the slag inlet end of the second slag discharge pipe is located above the slag inlet end of the first slag discharge pipe, and the slag outlet end of the second slag discharge pipe is connected with the slag inlet of the slag pool through a pipeline; a second quick-opening valve is arranged on the second slag discharge pipe; a second pressure reducing angle valve is arranged on the pipeline between the second slag discharge pipe and the slag pool.

4. The continuous slag removal method for a fluidized bed gasifier according to claim 3, characterized in that: The water outlet of the circulation pump is connected to the slag discharge ends of the first slag discharge pipe and the second slag discharge pipe through pipelines respectively; a first flushing valve is arranged on the pipeline between the circulation pump and the first slag discharge pipe; and a second flushing valve is arranged on the pipeline between the circulation pump and the second slag discharge pipe.

5. The continuous slag removal method for a fluidized bed gasifier according to claim 4, characterized in that: A temperature sensor is provided on the slag discharge pot, and a signal output end of the temperature sensor is connected to a signal input end of a controller through a signal; and a signal output end of the controller is connected to a signal input end of the inner spray control valve and a signal input end of the outer spray control valve through a signal.

6. The continuous slag removal method for a fluidized bed gasifier according to claim 5, characterized in that: A liquid level sensor is provided on the slag discharge tank, and a signal output end of the liquid level sensor is connected to a signal input end of a controller through a signal; the signal output end of the controller is respectively connected to the signal input ends of the first quick-opening valve, the first pressure-reducing angle valve, the second quick-opening valve, the second pressure-reducing angle valve, the first flushing valve and the second flushing valve through a signal.

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