A pulverized coal hydrogenation gasification furnace and slag removal method thereof

Abstract

The invention discloses a pulverized coal hydrogenation gasifier and a slag discharge method for the pulverized coal hydrogenation gasifier. The advantages are: 1. Two fluidized gas sources are used, which can avoid pore blockage, have no negative impact on the reaction, and save the cost of fluidized gas; 2. The semi-coke in the semi-coke discharge pipe can play a role of material sealing, and no synthesis gas will enter the subsequent semi-coke lock bucket system, and there is no need to perform nitrogen replacement and venting operation on the semi-coke lock bucket system, which simplifies the operation process of nitrogen replacement and avoids the waste of synthesis gas caused by replacement; 3. The fluidized gas can cool the semi-coke, and the discharge speed of the semi-coke can be controlled by controlling the flow rate of the fluidized gas; 4. The semi-coke is discharged in an upward external delivery manner, so that the discharge speed is controllable, and material blockage will not occur, ensuring the stable operation of the gasifier.

Description

Technical field:

[0001] The invention relates to the field of coal chemical industry, and in particular to a pulverized coal hydrogenation gasification furnace and a slag removal method thereof. Background technology:

[0002] Pulverized coal hydrogasification refers to the process in which carbon-containing compounds react with hydrogen under medium temperature (700-1000℃) and high pressure (5-10MPa) conditions to produce methane-rich raw coal gas, high value-added aromatic oil products and high calorific value semi-coke.

[0003] The gasifier of the existing hydrogenation device is designed with an upper reaction section and a lower semi-coke collection section. A combined nozzle is provided at the top of the gasifier, and high-temperature, high-pressure hydrogen, oxygen, and coal powder enter the reaction section through the nozzle at the same time. First, the high-temperature hydrogen and oxygen undergo an oxygen-poor combustion reaction to obtain higher-temperature (~1000°C) hydrogen, which then undergoes a coal hydrogenation pyrolysis reaction after contacting the coal powder. The semi-coke and synthesis gas produced after the reaction go down into the semi-coke collection section for gas-solid separation. After the synthesis gas produced leaves the gasifier from the upper middle part of the gasifier, it first passes through a cyclone separator. The preliminarily purified synthesis gas is recovered through a waste heat boiler for heat energy recovery. The relatively low-temperature synthesis gas enters the crude coal gas filter for further purification and is then sent to the oil recovery section. The high-temperature semi-coke produced by the gasifier enters the semi-coke cooler through the coke discharge pipeline at the bottom of the gasifier under the action of gravity for cooling; since the semi-coke enters the coke discharge pipeline by itself under the action of gravity, the feeding speed of the semi-coke cannot be controlled, and the coke discharge pipeline is often blocked by semi-coke, causing the gasifier to reduce the load and even require the gasifier to be shut down for processing, which seriously affects the safe and stable operation of the gasifier and also seriously restricts the continuous production of the system. At the same time, because the synthesis gas and semi-coke cannot be completely and effectively separated in the gasifier, the semi-coke contains a large amount of synthesis gas. Usually, the pressure of the semi-coke after the semi-coke cooler is about 6.8Mpa, which needs to be reduced by the lock bucket system; and after the semi-coke lock bucket system is reduced in pressure, the semi-coke lock bucket system needs to be replaced with nitrogen and qualified before it can be sent to the atmospheric pressure semi-coke collection tank for external discharge; since the replaced synthesis gas is usually vented, it causes a waste of synthesis gas, which in turn affects the economic benefits of the enterprise. Summary of the invention:

[0004] The first object of the present invention is to provide a pulverized coal hydrogasification furnace with reasonable structure, controllable discharge, blockage avoidance and stable operation. The second object of the present invention is to provide a slag removal method for the pulverized coal hydrogasification furnace.

[0005] The first object of the present invention is implemented by the following technical solutions:

[0006] A pulverized coal hydrogenation gasification furnace comprises a closed furnace body, in which a reaction chamber, a separation chamber, a storage chamber and a gas chamber are arranged in sequence from top to bottom;

[0007] The reaction chamber and the separation chamber are separated by a funnel-shaped slag discharge pipe fixedly arranged inside the furnace body; the separation chamber and the storage chamber are separated by a feeder fixedly arranged inside the furnace body; the storage chamber and the gas chamber are separated by a gas distribution plate fixedly arranged inside the furnace body, and a plurality of air holes connecting the storage chamber and the gas chamber are evenly arranged on the gas distribution plate;

[0008] A coal powder inlet, a hydrogen inlet and an oxygen inlet are respectively provided on the furnace body at the top of the reaction chamber;

[0009] A raw gas outlet is provided on the furnace body at the upper part of the separation chamber, and a semi-coke discharge port is provided on the furnace body of the separation chamber at the top of the discharger; a semi-coke feed port is provided on the furnace body at the lower part of the storage chamber; the semi-coke discharge port is connected to the semi-coke feed port through a semi-coke discharge pipe;

[0010] A fluidizing gas inlet is provided on the furnace body at the bottom of the gas chamber;

[0011] The feed end of the semi-coke discharge pipe passes through the furnace body of the storage chamber and is fixed above the air hole. The discharge end of the semi-coke discharge pipe is placed outside the furnace body, and the semi-coke discharge pipe is tilted upward from the feed end to the discharge end.

[0012] Preferably, the center lines of the pulverized coal inlet, the hydrogen inlet and the oxygen inlet converge at a point in the reaction chamber.

[0013] Preferably, the feeder is a conical structure.

[0014] Preferably, an umbrella-shaped sealing cap is provided above each air hole, and the sealing cap is fixedly connected to the gas distribution plate.

[0015] Preferably, at least two semi-coke feeding pipes are evenly arranged along the circumference of the furnace body, and at least two semi-coke discharging pipes are evenly arranged along the circumference of the furnace body.

[0016] Preferably, the semi-coke discharge pipe and the semi-coke feed pipe are both arc-shaped structures.

[0017] Preferably, the feed end of the semi-coke discharge pipe is arranged vertically.

[0018] Preferably, the fluidizing gas inlet is connected to a high-pressure hydrogen source and a high-pressure nitrogen source through pipelines respectively;

[0019] A hydrogen shut-off valve and a hydrogen flow regulating valve are provided on the pipeline connecting the fluidizing gas inlet and the high-pressure hydrogen source;

[0020] A nitrogen shut-off valve and a nitrogen flow regulating valve are provided on the pipeline connecting the fluidizing gas inlet and the high-pressure nitrogen source.

[0021] The second object of the present invention is implemented by the following technical solutions:

[0022] A slag removal method for a pulverized coal hydrogenation gasifier comprises the following steps:

[0023] (1) Reaction: oxygen, coal powder and high-temperature and high-pressure hydrogen are simultaneously fed into the reaction chamber of the gasifier to carry out hydrogenation pyrolysis reaction to obtain methane-rich raw coal gas, aromatic oil products and semi-coke;

[0024] (2) Separation: The crude gas, aromatic oil and semi-coke obtained in the separation of step (1) enter the separation chamber through the slag discharge pipe together, and the aromatic oil is discharged from the gasifier through the crude gas outlet at the upper part of the separation chamber along with the methane-rich crude gas. Under the action of the semi-coke discharger, the semi-coke discharge pipe enters the storage chamber;

[0025] (3) Slag discharge: Fluidizing gas enters from the bottom of the gas chamber, is evenly distributed through the gas distribution plate, and then enters the storage chamber. Under the action of fluidizing gas, semi-coke is discharged from the gasifier through the semi-coke discharge pipe in an upward manner.

[0026] Preferably, in the slag discharge of step (3), high-pressure hydrogen is used as the fluidizing gas at the initial start-up of the gasifier; after the gasifier operates stably, the semi-coke in the semi-coke discharge pipe isolates the separation chamber and the storage chamber, and high-pressure nitrogen is used as the fluidizing gas.

[0027] Advantages of the present invention:

[0028] 1. Two fluidizing gas sources are used. In the initial stage of operation, since the material seal in the semi-coke feeding pipe has not yet been formed, a small flow of high-pressure hydrogen is used as the fluidizing gas, which can prevent the pores from being blocked. At the same time, even if hydrogen enters the reaction chamber through the semi-coke feeding pipe and the separation chamber, it will not have a negative impact on the reaction. After the gasifier is running stably, the fluidizing gas is gradually switched to high-pressure nitrogen, which can reduce the amount of high-pressure hydrogen used and save the cost of fluidizing gas.

[0029] 2. When the gasifier is running stably, the semi-coke in the semi-coke discharge pipe can play the role of material sealing, isolating the separation chamber and the storage chamber from each other, ensuring that the synthesis gas in the separation chamber will not enter the storage chamber, and no synthesis gas will enter the subsequent semi-coke lock hopper system. There is no need to perform nitrogen replacement and venting operations on the semi-coke lock hopper system, which simplifies the operation process of nitrogen replacement and avoids the waste of synthesis gas caused by replacement. At the same time, the fluidizing gas in the storage chamber will not enter the separation chamber, preventing nitrogen from entering the reaction chamber and affecting the normal progress of the reaction;

[0030] 3. After the fluidizing gas is evenly distributed through the gas distribution plate, it can ensure that the semi-coke in the entire semi-coke storage room is evenly delivered to the subsequent system through the semi-coke discharge pipe. The fluidizing gas can cool the semi-coke, and the discharge speed of the semi-coke can be controlled by controlling the flow rate of the fluidizing gas;

[0031] 4. The semi-coke in the storage chamber is discharged in an upward manner through the semi-coke discharge pipe, so that the discharge speed is controllable and material blockage will not occur. By vertically arranging the feed end of the semi-coke discharge pipe, it is easier for the fluidizing gas to blow the semi-coke into the semi-coke discharge pipe. By arranging the semi-coke discharge pipe and the semi-coke feed pipe into an arc structure, the semi-coke transportation is smoother, ensuring the stable operation of the gasifier. Description of the drawings:

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0034] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0035] In the figure: furnace body 1, reaction chamber 2, separation chamber 3, storage chamber 4, gas chamber 5, slag discharge pipe 6, feeder 7, gas distribution plate 8, air hole 9, sealing cap 10, coal powder inlet 11, hydrogen inlet 12, oxygen inlet 13, raw coal gas outlet 14, semi-coke feed pipe 15, fluidizing gas inlet 16, high-pressure hydrogen source 17, high-pressure nitrogen source 18, hydrogen shut-off valve 19, hydrogen flow regulating valve 20, semi-coke discharge pipe 21, nitrogen shut-off valve 22, nitrogen flow regulating valve 23. Specific implementation method:

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] like Figure 1 , Figure 2The pulverized coal hydrogenation gasification furnace shown comprises a closed furnace body 1, in which a reaction chamber 2, a separation chamber 3, a storage chamber 4 and a gas chamber 5 are arranged in sequence from top to bottom;

[0039] The reaction chamber 2 and the separation chamber 3 are separated by a funnel-shaped slag discharge pipe 6 fixed inside the furnace body 1; the separation chamber 3 and the storage chamber 4 are separated by a conical discharger 7 fixed inside the furnace body 1; the storage chamber 4 and the gas chamber 5 are separated by a gas distribution plate 8 fixed inside the furnace body 1, and a plurality of air holes 9 connecting the storage chamber 4 and the gas chamber 5 are evenly opened on the gas distribution plate 8, and an umbrella-shaped sealing cap 10 is provided above each air hole 9, and the sealing cap 10 is fixedly connected to the gas distribution plate 8.

[0040] A coal powder inlet 11, a hydrogen inlet 12 and an oxygen inlet 13 are respectively provided on the furnace body 1 at the top of the reaction chamber 2, and the center lines of the coal powder inlet 11, the hydrogen inlet 12 and the oxygen inlet 13 converge at a point in the reaction chamber 2, which is conducive to the full fusion of the coal powder and the high-temperature hydrogen, so that the hydrogenation reaction is more thorough.

[0041] A crude gas outlet 14 is provided on the furnace body 1 at the upper part of the separation chamber 3, and a semi-coke discharge port is provided on the furnace body 1 of the separation chamber 3 at the top of the discharger 7; a semi-coke feed port is provided on the furnace body 1 at the lower part of the storage chamber 4; the semi-coke discharge port is connected to the semi-coke feed port through a semi-coke discharge pipe 15;

[0042] A fluidizing gas inlet 16 is provided on the furnace body 1 at the bottom of the gas chamber 5; the fluidizing gas inlet 16 is connected to a high-pressure hydrogen source 17 and a high-pressure nitrogen source 18 through pipelines respectively;

[0043] A hydrogen shut-off valve 19 and a hydrogen flow regulating valve 20 are provided on the pipeline connecting the fluidizing gas inlet 16 and the high-pressure hydrogen source 17;

[0044] A nitrogen shut-off valve 22 and a nitrogen flow regulating valve 23 are provided on the pipeline connecting the fluidizing gas inlet 16 and the high-pressure nitrogen source 18 .

[0045] The feed end of the semi-coke discharge pipe 21 passes through the furnace body 1 of the storage chamber 4 and is fixed above the air hole 9 through a fixed support frame. The discharge end of the semi-coke discharge pipe 21 is placed outside the furnace body 1, and the semi-coke discharge pipe 21 is inclined upward in the direction from the feed end to the discharge end.

[0046] In this embodiment, two semi-coke feeding pipes 15 are evenly arranged along the circumference of the furnace body 1. Four semi-coke discharge pipes 21 are evenly arranged along the circumference of the furnace body 1. The semi-coke discharge pipe 21 and the semi-coke feeding pipe 15 are both arc-shaped structures, and the feeding end of the semi-coke discharge pipe 21 is vertically arranged, and the diameter of the semi-coke discharge pipe 21 is 40 mm.

[0047] Job Description:

[0048] A combined nozzle is provided at the top of the furnace body. High-temperature, high-pressure hydrogen, oxygen and coal powder enter the gasifier through the nozzle at the same time. First, the high-temperature hydrogen (450°C) reacts with oxygen to produce oxygen-poor combustion to obtain higher-temperature (~1000°C) hydrogen. The high-temperature hydrogen (~1000°C) contacts with coal powder to produce coal hydrogenation pyrolysis reaction, generating methane-rich raw gas, high-value-added aromatic oil products and high-calorific value semi-coke, which enter the separation chamber 3 through the slag discharge pipe 6. The high-value-added aromatic oil products are discharged from the furnace body 1 along with the methane-rich raw gas through the raw gas outlet 14 at the top of the separation chamber 3 to the post-heat recovery process. The semi-coke enters the storage chamber 4 under the action of the conical discharger 7 provided at the bottom of the reaction chamber 2 through the semi-coke discharge pipe 15 under the action of its own weight and pressure difference. The fluidizing gas enters from the bottom of the gas chamber 5 and is evenly distributed through the gas distribution plate 8. The semi-coke in the storage chamber 4 can be delivered to the subsequent semi-coke lock bucket system through the semi-coke discharge pipe 21, which can ensure that the semi-coke in the entire semi-coke storage chamber 4 is evenly delivered. The air holes 9 opened on the gas distribution plate 8 are provided with umbrella-shaped caps 10 to prevent the air holes 9 from being blocked.

[0049] In this embodiment, two gases are used as fluidizing gas, namely, high-pressure hydrogen and high-pressure nitrogen. In the initial stage of start-up, that is, during the process of baking the furnace and initially feeding coal, high-pressure hydrogen is used as fluidizing gas, and a small flow rate is controlled to ensure that the pores 9 on the gas distribution plate 8 are not blocked, and to prevent a large amount of nitrogen from entering the reaction chamber 2 and affecting the normal progress of the reaction. After the semi-coke layer is accumulated at the bottom of the separation chamber 3 and the semi-coke enters the storage chamber 4 smoothly through the semi-coke discharge pipe 15, the hydrogen flow rate is gradually increased, and the semi-coke is sent to the downstream semi-coke lock bucket system through the semi-coke discharge pipe 21 under the action of the fluidizing gas. When the semi-coke layer at the top of the discharger 7 in the separation chamber 3 is stable, and the semi-coke in the semi-coke discharge pipe 15 has played the role of material sealing, that is, the separation chamber 3 and the storage chamber 4 can be isolated through the semi-coke layer in the semi-coke discharge pipe 15, so that the gases in the separation chamber 3 and the storage chamber 4 cannot be mutually connected, ensuring that the synthesis gas in the separation chamber 3 will not enter the storage chamber 4, and the fluidizing gas in the storage chamber 4 will not enter the separation chamber 3. After the material seal is formed in the semi-coke discharge pipe 15, the fluidizing gas is gradually switched to high-pressure nitrogen, and the high-pressure hydrogen is gradually withdrawn from the system. The semi-coke discharge pipe 21 discharges the semi-coke in the storage chamber 4 in an upward manner. The discharge speed of the semi-coke is controlled by the flow rate of the fluidizing gas. Even when the flow rate of the fluidizing gas is small, the semi-coke in the semi-coke discharge pipe 21 will return to the storage chamber 4 under the action of its own weight, and will not accumulate in the semi-coke discharge pipe 21 and cause blockage. In actual application, the discharge is stable, and the discharge amount of the semi-coke can be effectively controlled simply by the flow rate of the fluidizing gas. At the same time, the fluidizing gas can also play a certain cooling role on the semi-coke. In addition, since the material seal in the semi-coke discharge pipe 15 effectively isolates the separation chamber 3 and the storage chamber 4, no synthesis gas will enter the subsequent semi-coke lock bucket system, and there is no need to perform nitrogen replacement and venting operations on the semi-coke lock bucket system. This simplifies the operating process of nitrogen replacement, avoids the traditional waste of synthesis gas and high-pressure nitrogen caused by replacement, and greatly saves operating costs.

[0050] Embodiment 2:

[0051] A method for slag removal using a pulverized coal hydrogasification furnace provided in Example 1 comprises the following steps:

[0052] (1) Reaction: oxygen, pulverized coal and 450°C high-temperature and high-pressure hydrogen are simultaneously fed into the reaction chamber 2 of the gasifier through a nozzle. First, the high-temperature hydrogen (450°C) reacts with oxygen to produce hydrogen at a higher temperature (~1000°C). The high-temperature hydrogen (~1000°C) contacts the pulverized coal and undergoes a coal hydrogenation pyrolysis reaction to produce methane-rich raw coal gas, high-value-added aromatic oil products and high-calorific-value semi-coke.

[0053] (2) Separation: The crude gas, aromatic oil products and semi-coke obtained in the separation of step (1) enter the separation chamber 3 through the slag discharge pipe 6, and the high value-added aromatic oil products are discharged from the furnace body 1 along with the methane-rich crude gas through the crude gas outlet 14 at the upper part of the separation chamber 3 to the heat recovery process. The semi-coke enters the storage chamber 4 through the semi-coke discharge pipe 15 under the action of the conical discharger 7 provided at the lower part of the reaction chamber 2 under the action of its own weight and pressure difference;

[0054] (3) Slag discharge: Fluidizing gas enters from the bottom of the gas chamber 5, is evenly distributed through the gas distribution plate 8, and then enters the storage chamber 4. Under the action of the fluidizing gas, the semi-coke is discharged from the gasifier through the semi-coke discharge pipe 21 in an upward manner. The discharge speed of the semi-coke is controlled by the flow rate of the fluidizing gas. Even if the flow rate of the fluidizing gas is small, the semi-coke in the semi-coke discharge pipe 21 will return to the storage chamber 4 under the action of its own weight, and will not accumulate in the semi-coke discharge pipe 21 and cause blockage. In actual application, the discharge is stable, and the discharge amount of the semi-coke can be effectively controlled simply by the flow rate of the fluidizing gas. At the same time, the fluidizing gas can also play a certain cooling role on the semi-coke. In addition, since the material seal in the semi-coke discharge pipe 15 effectively isolates the separation chamber 3 and the storage chamber 4, no synthesis gas will enter the subsequent semi-coke lock bucket system, and there is no need to perform nitrogen replacement and venting operations on the semi-coke lock bucket system. This simplifies the operating process of nitrogen replacement, avoids the traditional waste of synthesis gas and high-pressure nitrogen caused by replacement, and greatly saves operating costs.

[0055] In this embodiment, at the initial start-up of the gasifier, high-pressure hydrogen is used as the fluidizing gas, and a small flow rate is controlled to ensure that the pores 9 on the gas distribution plate 8 are not blocked, and to prevent a large amount of nitrogen from entering the reaction chamber 2 and affecting the normal progress of the reaction; after the gasifier is stably operated, a semi-coke layer is accumulated at the bottom of the separation chamber 3, and the amount of semi-coke in the semi-coke discharge pipe 15 increases, which can isolate the separation chamber 3 and the storage chamber 4, and play a role in sealing, so that the gases in the separation chamber 3 and the storage chamber 4 cannot be mutually connected, ensuring that the synthesis gas in the separation chamber 3 will not enter the storage chamber 4, and the fluidizing gas in the storage chamber 4 will not enter the separation chamber 3, then gradually switch the fluidizing gas to high-pressure nitrogen, so that the amount of high-pressure hydrogen can be reduced, thereby saving the cost of fluidizing gas.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulverized coal hydrogenation gasifier, characterized in that: It comprises a closed furnace body, in which a reaction chamber, a separation chamber, a storage chamber and a gas chamber are arranged in sequence from top to bottom; The reaction chamber and the separation chamber are separated by a funnel-shaped slag discharge pipe fixedly arranged inside the furnace body; the separation chamber and the storage chamber are separated by a feeder fixedly arranged inside the furnace body; the storage chamber and the gas chamber are separated by a gas distribution plate fixedly arranged inside the furnace body, and a plurality of air holes connecting the storage chamber and the gas chamber are evenly arranged on the gas distribution plate; A coal powder inlet, a hydrogen inlet and an oxygen inlet are respectively provided on the furnace body at the top of the reaction chamber; A raw gas outlet is provided on the furnace body at the upper part of the separation chamber, and a semi-coke discharge port is provided on the furnace body of the separation chamber at the top of the discharger; a semi-coke feed port is provided on the furnace body at the lower part of the storage chamber; the semi-coke discharge port is connected to the semi-coke feed port through a semi-coke discharge pipe; A fluidizing gas inlet is provided on the furnace body at the bottom of the gas chamber; The feed end of the semi-coke discharge pipe passes through the furnace body of the storage chamber and is fixed above the air hole. The discharge end of the semi-coke discharge pipe is placed outside the furnace body, and the semi-coke discharge pipe is tilted upward from the feed end to the discharge end.

2. A pulverized coal hydrogasification furnace according to claim 1, characterized in that: The center lines of the pulverized coal inlet, the hydrogen inlet and the oxygen inlet converge at a point in the reaction chamber.

3. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: The feeder is a conical structure.

4. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: An umbrella-shaped sealing cap is arranged above each air hole, and the sealing cap is fixedly connected to the gas distribution plate.

5. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: At least two semi-coke feeding pipes are evenly arranged along the circumference of the furnace body, and at least two semi-coke discharging pipes are evenly arranged along the circumference of the furnace body.

6. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: The semi-coke discharge pipe and the semi-coke feed pipe are both arc-shaped structures.

7. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: The feed end of the semi-coke discharge pipe is arranged vertically.

8. The pulverized coal hydrogasification furnace according to claim 1, characterized in that: The fluidizing gas inlet is connected to a high-pressure hydrogen source and a high-pressure nitrogen source through pipelines respectively; A hydrogen shut-off valve and a hydrogen flow regulating valve are provided on the pipeline connecting the fluidizing gas inlet and the high-pressure hydrogen source; A nitrogen shut-off valve and a nitrogen flow regulating valve are provided on the pipeline connecting the fluidizing gas inlet and the high-pressure nitrogen source.

9. A method for slag removal using the pulverized coal hydrogasification furnace according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Reaction: oxygen, coal powder and high-temperature and high-pressure hydrogen are simultaneously fed into the reaction chamber of the gasifier to carry out hydrogenation pyrolysis reaction to obtain methane-rich raw coal gas, aromatic oil products and semi-coke; (2) Separation: The crude gas, aromatic oil and semi-coke obtained in the separation of step (1) enter the separation chamber through the slag discharge pipe together, and the aromatic oil is discharged from the gasifier through the crude gas outlet at the upper part of the separation chamber along with the methane-rich crude gas. Under the action of the semi-coke discharger, the semi-coke discharge pipe enters the storage chamber; (3) Slag discharge: Fluidizing gas enters from the bottom of the gas chamber, is evenly distributed through the gas distribution plate, and then enters the storage chamber. Under the action of fluidizing gas, semi-coke is discharged from the gasifier through the semi-coke discharge pipe in an upward manner.

10. The slag removal method for a pulverized coal hydrogasification furnace according to claim 9, characterized in that: In the slag discharge of step (3), high-pressure hydrogen is used as fluidizing gas at the initial start-up of the gasifier; after the gasifier is stably operated, the semi-coke in the semi-coke discharge pipe isolates the separation chamber and the storage chamber, and high-pressure nitrogen is used as fluidizing gas.

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