Coal high-temperature dry distillation and gasification system

Abstract

The application discloses a coal high-temperature dry distillation and gasification system, which comprises a low-temperature gasification furnace, a high-temperature gasification furnace, a quenching tank, a buffer tank and a slag conveyor; a coal outlet at the bottom of the low-temperature gasification furnace is communicated with a coal inlet at the top of the high-temperature gasification furnace; a slag discharge port at the bottom of the high-temperature gasification furnace is communicated with a slag inlet at the top of the quenching tank, a slag discharge port at the bottom of the quenching tank is communicated with a slag inlet at the top of the buffer tank, a first slag discharge valve is arranged between the quenching tank and the buffer tank, and a slag discharge port at the bottom of the buffer tank is communicated with a slag inlet of the slag conveyor, and a second slag discharge valve is arranged between the buffer tank and the slag conveyor. The application can produce coal gas with high calorific value (high CH4 content) and obtain high-value tar products, so that the system is the best choice for realizing efficient utilization of raw coal, is suitable for gasification of various coals, has wide applicability, realizes recycling and reprocessing of dust and full utilization of coal, realizes water recycling and avoids waste of water resources.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal high-temperature dry distillation gasification, and particularly relates to a coal high-temperature dry distillation gasification system. BACKGROUND

[0002] There are many kinds of coal gasification methods at present, such as pulverized coal gasification, coal water slurry gasification, fluidized bed gasification, catalytic gasification, hydrogenation gasification, fixed bed gasification, etc. Each gasification method has advantages and disadvantages. The most obvious performance is that most gasification processes have specific requirements for coal types. For example, the pulverized coal gasification requires strict control of the particle size of the pulverized coal, so the pulverized coal preparation process is complex, and the small particle size of the pulverized coal is easy to burn and can easily cause an explosion hazard on site; the coal water slurry gasification needs to select coal with good slurry forming property, high calorific value and low ash melting point; the fluidized bed gasification process and the catalytic gasification process cannot gasify coal with high calorific value and low ash melting point; the hydrogenation gasification process uses high-temperature hydrogen to heat coal for gasification, but a large amount of semi-coke waste is generated; the fixed bed gasification process needs to select high-quality coal with strong thermal stability.

[0003] The above-mentioned several conventional gasification methods are all reactions of coal and gasification agents to produce crude coal gas (CO, CH 4、 H2), in which CH4 is trace or none. In the gasification process, since the gasification temperature is high, the volatile matter and tar rich in coal are basically converted into CO and H2, and the effective components such as volatile matter and tar in the coal cannot be recovered, so from the clean utilization of coal, the above-mentioned several gasification methods are not the best choice for coal gasification. SUMMARY

[0004] The purpose of the present application is to provide a coal high-temperature dry distillation gasification system which realizes efficient utilization of raw coal, has wide applicability, and realizes water recycling.

[0005] The technical scheme of the present application discloses a coal high-temperature dry distillation gasification system, which comprises a low-temperature gasification furnace, a high-temperature gasification furnace, a quenching tank, a buffer tank and a slag conveyor; a gas outlet is formed at the top of the low-temperature gasification furnace, and a coal feeding port is formed above the low-temperature gasification furnace; the coal outlet at the bottom of the low-temperature gasification furnace is in communication with the coal inlet at the top of the high-temperature gasification furnace; the slag discharge port at the bottom of the high-temperature gasification furnace is in communication with the slag inlet at the top of the quenching tank, the slag discharge port at the bottom of the quenching tank is in communication with the slag inlet at the top of the buffer tank, a first slag discharge valve is arranged between the quenching tank and the buffer tank, and the slag discharge port at the bottom of the buffer tank is in communication with the slag inlet of the slag conveyor, and a second slag discharge valve is arranged between the buffer tank and the slag conveyor.

[0006] Further, two coal feeding ports are symmetrically formed above the low-temperature gasification furnace.

[0007] Further, it also includes a steam pipeline and an oxygen pipeline; the gas outlet ends of the steam pipeline and the oxygen pipeline are communicated with the gas inlets at the bottom of the low-temperature gasification furnace; the gas outlet ends of the steam pipeline and the oxygen pipeline are communicated with the gas inlets above the high-temperature gasification furnace; the gas outlet ends of the steam pipeline and the oxygen pipeline are communicated with the gas inlets below the high-temperature gasification furnace.

[0008] Further, a first temperature sensor is arranged at the top of the low-temperature gasification furnace, and an upper steam control valve and an upper oxygen control valve are arranged on the steam pipeline and the oxygen pipeline connected with the low-temperature gasification furnace respectively; a second temperature sensor is arranged above the high-temperature gasification furnace, and a middle steam control valve and a middle oxygen control valve are arranged on the steam pipeline and the oxygen pipeline connected with the gas inlet above the high-temperature gasification furnace respectively; a third temperature sensor is arranged below the high-temperature gasification furnace, and a lower steam control valve and a lower oxygen control valve are arranged on the steam pipeline and the oxygen pipeline connected with the gas inlet below the high-temperature gasification furnace respectively; the signal output ends of the first temperature sensor, the second temperature sensor and the third temperature sensor are in signal communication with the signal input end of a controller, and the signal output end of the controller is in signal communication with the signal input ends of the upper steam control valve, the upper oxygen control valve, the middle steam control valve, the middle oxygen control valve, the lower steam control valve and the lower oxygen control valve respectively.

[0009] Further, it also includes a clean water tank, a water supplement pipeline, a quenching water pipeline and a slag pumping pipeline; the overflow port of the slag extractor is communicated with the water inlet of the clean water tank, the water outlet end of the water supplement pipeline is communicated with the water inlet of the clean water tank, the water outlet of the clean water tank is communicated with the water inlet at the top of the quenching tank through the quenching water pipeline, and one end of the slag pumping pipeline is located at the bottom of the quenching tank, and the other end of the slag pumping pipeline is communicated with the slag inlet at the top of the buffer tank through the side wall of the quenching tank.

[0010] Further, the water outlet of the clean water tank is communicated with the side wall of the slag pumping pipeline, the bottom of the quenching tank and the top of the buffer tank through pipelines respectively; a flushing valve is arranged on the pipeline between the clean water tank and the slag pumping pipeline, a fluidizing valve is arranged on the pipeline between the clean water tank and the quenching tank, and a water injection valve is arranged on the pipeline between the clean water tank and the buffer tank.

[0011] Further, a fourth temperature sensor and a liquid level sensor are arranged in the quenching tank; a quenching water control valve is arranged on the quenching water pipe; a slag pumping control valve is arranged on the slag pumping pipe; the signal output ends of the fourth temperature sensor and the liquid level sensor are in signal communication with the signal input end of the controller; the signal output end of the controller is in signal communication with the signal input ends of the quenching water control valve and the slag pumping control valve respectively.

[0012] Further, a vent pipe is arranged on the top of the buffer tank, and a vent valve is arranged on the vent pipe.

[0013] Further, it comprises a cyclone separator and a pneumatic conveying device; the gas outlet of the low-temperature gasification furnace is in communication with the gas inlet of the cyclone separator, a raw gas outlet is arranged on the top of the cyclone separator, the discharge outlet at the bottom of the cyclone separator is in communication with the feed inlet of the pneumatic conveying device, and the discharge outlet of the pneumatic conveying device is in communication with the feed inlet below the high-temperature gasification furnace.

[0014] Further, the pneumatic conveying device comprises a first vertical pipe, a horizontal pipe, a second vertical pipe, an inclined pipe and a carbon dioxide source; the discharge outlet at the bottom of the cyclone separator is in communication with the inlet end of the first vertical pipe, the outlet end of the first vertical pipe is in communication with the sidewall above one end of the horizontal pipe, the inlet end of the second vertical pipe is in communication with the sidewall below the other end of the horizontal pipe; the outlet end of the second vertical pipe is in communication with the inlet end of the inclined pipe, and the outlet end of the inclined pipe is in communication with the feed inlet below the high-temperature gasification furnace; the carbon dioxide source is in communication with the gas inlets of one end of the horizontal pipe and the inlet end of the inclined pipe through gas conveying pipes, and a gas valve is arranged on each gas conveying pipe.

[0015] Further, the carbon dioxide source is in communication with the bottom of the horizontal pipe opposite to the outlet end of the first vertical pipe through a purge pipe; the carbon dioxide source is in communication with the upper part of the horizontal pipe opposite to the inlet end of the second vertical pipe through a purge pipe; the carbon dioxide source is in communication with the gas inlets of the other end of the horizontal pipe through a purge pipe; a purge valve is arranged on each purge pipe.

[0016] Advantages of the present application:

[0017] 1. The high-temperature gasification furnace of the present application is used for gasification of high-temperature crude coal gas into a low-temperature gasification furnace, and the crude coal is first dry-distilled, and the tar and volatile components in the crude coal are all volatilized into the crude coal gas, and the crude coal is changed into coke, and then the coke is put into the high-temperature gasification furnace for high-temperature gasification, and the crude coal gas carrying the tar and volatile components is subjected to subsequent treatment, so that high-calorific-value coal gas (high CH4 content) can be produced, and high-value-added tar products can also be obtained, and therefore the system of the present application is the best choice for efficient utilization of crude coal.

[0018] 2. Since the crude coal is first dry-distilled in the low-temperature gasification furnace and then subjected to high-temperature gasification in the high-temperature gasification furnace, the system of the present application is suitable for gasification of various coals, and has wide applicability.

[0019] 3. The dust in the crude coal gas is separated by the cyclone separator, and the dust is transported to the bottom of the high-temperature gasification furnace by the pneumatic conveying device for high-temperature gasification, so that the dust is recycled and treated again, and the utilization of coal is fully realized.

[0020] 4. The clear water overflowed from the slag extractor flows into the clear water pool, and is reused in the quenching tank to cool the coal slag, so that water recycling is realized, and waste of water resources is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0022] Fig. 2 It is a control system block diagram of the embodiment of the present application.

[0023] Low-temperature gasification furnace 1, coal feeding port 101, high-temperature gasification furnace 2, quenching tank 3, buffer tank 4, slag extractor 5, steam pipeline 6, oxygen pipeline 7, clear water pool 8, water supply pipeline 9, quenching water pipeline 10, slag extraction pipeline 11, cyclone separator 12, pneumatic conveying device 13, first vertical pipeline 131, horizontal pipeline 132, second vertical pipeline 133, inclined pipeline 134, carbon dioxide gas source 135, gas feeding pipeline 136, gas valve 137, purging pipeline 138, purging valve 139, first slag discharge valve 14, second slag discharge valve 15, first temperature sensor 16, upper steam control valve 17, upper oxygen control valve 18, second temperature sensor 19, middle steam control valve 20, middle oxygen control valve 21, third temperature sensor 22, lower steam control valve 23, lower oxygen control valve 24, controller 25, flushing valve 26, fluidization valve 27, water injection valve 28, venting pipeline 29, venting valve 30, fourth temperature sensor 31, liquid level sensor 32, quenching water control valve 33, slag extraction control valve 34. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below with reference to the accompanying drawings.

[0025] As Figs. 1-2 shown, a coal high-temperature dry distillation gasification system comprises a low-temperature gasification furnace 1, a high-temperature gasification furnace 2, a quenching tank 3, a buffer tank 4, a slag conveyor 5, a steam pipeline 6, an oxygen pipeline 7, a clean water pool 8, a water supplement pipeline 9, a quenching water pipeline 10, a slag extraction pipeline 11, a cyclone separator 12 and a pneumatic conveying device 13; a gas outlet is formed at the top of the low-temperature gasification furnace 1, two coal feeding ports 101 are symmetrically formed above the low-temperature gasification furnace 1, and raw coal is symmetrically added so as to uniformly distribute the raw coal in the low-temperature gasification furnace 1; a coal outlet at the bottom of the low-temperature gasification furnace 1 is communicated with a coal inlet at the top of the high-temperature gasification furnace 2; a slag outlet at the bottom of the high-temperature gasification furnace 2 is communicated with a slag inlet at the top of the quenching tank 3, and a slag outlet at the bottom of the quenching tank 3 is communicated with a slag inlet at the top of the buffer tank 4; a first slag discharge valve 14 is arranged between the quenching tank 3 and the buffer tank 4, and a slag outlet at the bottom of the buffer tank 4 is communicated with a slag inlet of the slag conveyor 5; a second slag discharge valve 15 is arranged between the buffer tank 4 and the slag conveyor 5.

[0026] The gas outlets of the steam pipeline 6 and the oxygen pipeline 7 are both communicated with the gas inlets at the bottom of the low-temperature gasification furnace 1; the gas outlets of the steam pipeline 6 and the oxygen pipeline 7 are both communicated with the gas inlets above the high-temperature gasification furnace 2; the gas outlets of the steam pipeline 6 and the oxygen pipeline 7 are both communicated with the gas inlets below the high-temperature gasification furnace 2; a first temperature sensor 16 is arranged at the top of the low-temperature gasification furnace 1, and an upper steam control valve 17 and an upper oxygen control valve 18 are respectively arranged on the steam pipeline 6 and the oxygen pipeline 7 connected with the low-temperature gasification furnace 1; a second temperature sensor 19 is arranged above the high-temperature gasification furnace 2, and a middle steam control valve 20 and a middle oxygen control valve 21 are respectively arranged on the steam pipeline 6 and the oxygen pipeline 7 connected with the gas inlets above the high-temperature gasification furnace 2; a third temperature sensor 22 is arranged below the high-temperature gasification furnace 2, and a lower steam control valve 23 and a lower oxygen control valve 24 are respectively arranged on the steam pipeline 6 and the oxygen pipeline 7 connected with the gas inlets below the high-temperature gasification furnace 2; the signal output ends of the first temperature sensor 16, the second temperature sensor 19 and the third temperature sensor 22 are all in signal communication with the signal input end of a controller 25, and the signal output end of the controller 25 is in signal communication with the signal input ends of the upper steam control valve 17, the upper oxygen control valve 18, the middle steam control valve 20, the middle oxygen control valve 21, the lower steam control valve 23 and the lower oxygen control valve 24 respectively.

[0027] The overflow port of the slag conveyor 5 is communicated with the water inlet of the clean water tank 8, the water outlet of the clean water tank 8 is communicated with the water inlet at the top of the quenching tank 3 through the quenching water pipe 10, one end of the slag pumping pipe 11 is located at the bottom of the quenching tank 3, and the other end of the slag pumping pipe 11 is communicated with the inlet of the buffer tank 4 through the slag inlet of the sidewall above the quenching tank 3; the water outlet of the clean water tank 8 is communicated with the sidewall of the slag pumping pipe 11, the bottom of the quenching tank 3 and the upper part of the buffer tank 4 through pipes respectively; a flushing valve 26 is arranged on the pipe between the clean water tank 8 and the slag pumping pipe 11, a fluidizing valve 27 is arranged on the pipe between the clean water tank 8 and the quenching tank 3, and a water injection valve 28 is arranged on the pipe between the clean water tank 8 and the buffer tank 4; a vent pipe 29 is arranged at the top of the buffer tank 4, and a vent valve 30 is arranged on the vent pipe 29.

[0028] The fourth temperature sensor 31 and the liquid level sensor 32 are arranged in the quenching tank 3; the quenching water control valve 33 is arranged on the quenching water pipe 10; the slag pumping control valve 34 is arranged on the slag pumping pipe 11; the signal output ends of the fourth temperature sensor 31 and the liquid level sensor 32 are communicated with the signal input end of the controller 25; the signal output ends of the controller 25 are communicated with the signal input ends of the quenching water control valve 33 and the slag pumping control valve 34 respectively.

[0029] The gas outlet of the low-temperature gasification furnace 1 is communicated with the gas inlet of the cyclone separator 12, the coarse gas outlet is arranged at the top of the cyclone separator 12, the discharge port at the bottom of the cyclone separator 12 is communicated with the feeding port of the pneumatic conveying device 13, and the discharge port of the pneumatic conveying device 13 is communicated with the feeding port below the high-temperature gasification furnace 2.

[0030] The pneumatic conveying device 13 comprises a first vertical pipe 131, a horizontal pipe 132, a second vertical pipe 133, an inclined pipe 134 and a carbon dioxide gas source 135; the outlet at the bottom of the cyclone separator 12 is communicated with the inlet end of the first vertical pipe 131, the outlet end of the first vertical pipe 131 is communicated with the side wall above one end of the horizontal pipe 132, the inlet end of the second vertical pipe 133 is communicated with the side wall below the other end of the horizontal pipe 132; the outlet end of the second vertical pipe 133 is communicated with the inlet end of the inclined pipe 134, the outlet end of the inclined pipe 134 is communicated with the inlet at the bottom of the high-temperature gasification furnace 2; the carbon dioxide gas source 135 is communicated with the gas inlet at one end of the horizontal pipe 132 through a gas conveying pipe 136, the carbon dioxide gas source 135 is communicated with the inlet end of the inclined pipe 134 through a gas conveying pipe 136, and a gas valve 137 is arranged on each gas conveying pipe 136; the carbon dioxide gas source 135 is communicated with the bottom of the horizontal pipe 132 opposite to the outlet end of the first vertical pipe 131 through a purge pipe 138; the carbon dioxide gas source 135 is communicated with the upper part of the horizontal pipe 132 opposite to the inlet end of the second vertical pipe 133 through a purge pipe 138; the carbon dioxide gas source 135 is communicated with the gas inlet at the other end of the horizontal pipe 132 through a purge pipe 138; a purge valve 139 is arranged on each purge pipe 138, and by controlling the purge valve 139, carbon dioxide gas is conveyed in each purge pipe 138, and then used for dredging the corresponding first vertical pipe 131, second vertical pipe 133 and horizontal pipe 132.

[0031] Working principle: The raw coal is added from the coal adding port 101 of the low-temperature gasification furnace 1, and is subjected to dry distillation by the high-temperature raw coal gas from the high-temperature gasification furnace 2, and the tar and volatile components in the raw coal are all volatilized into the raw coal gas, and the raw coal becomes coke, which enters the high-temperature gasification furnace 2 from the top of the high-temperature gasification furnace 2, and the steam and oxygen mixed as the gasification agent enter the bottom of the high-temperature gasification furnace 2 to react with the coke to form a high-temperature zone, so that the coke is gasified to form molten coal cinder, and since the raw coal is subjected to dry distillation in the low-temperature gasification furnace 1 and then high-temperature gasification in the high-temperature gasification furnace 2, the system is suitable for the gasification of various coals and has wide applicability; the third temperature sensor 22 transmits the detected temperature signal of the bottom of the high-temperature gasification furnace 2 to the controller 25 at all times, and when the temperature is higher than the set value, the controller 25 controls the lower steam control valve 23 to be opened, and when the temperature is lower than the set value, the controller 25 controls the lower oxygen control valve 24 to be opened; the high-temperature raw coal gas generated by the high-temperature gasification furnace 2 rises, and the second temperature sensor 19 transmits the detected temperature signal above the high-temperature gasification furnace 2 to the controller 25 at all times, and when the temperature is higher than the set value, the controller 25 controls the middle steam control valve 20 to be opened, and when the temperature is lower than the set value, the controller 25 controls the middle oxygen control valve 21 to be opened; the high-temperature raw coal gas generated by the high-temperature gasification furnace 2 continues to rise and enters the low-temperature gasification furnace 1 to exchange heat with the raw coal, so that the raw coal is subjected to high-temperature drying and dry distillation, and the volatile components and tar in the raw coal are separated and mixed into the raw coal gas, and the raw coal becomes coke and enters the high-temperature gasification furnace 2, and the above process is repeated. The high-temperature raw coal gas in the low-temperature gasification furnace 1 gradually reduces in temperature during the rising process, and at the top of the low-temperature gasification furnace 1, the raw coal gas is cooled to 600-700 DEG C, and the first temperature sensor 16 transmits the detected temperature signal above the low-temperature gasification furnace 1 to the controller 25 at all times, and when the temperature is higher than the set value, the controller 25 controls the upper steam control valve 17 to be opened, and when the temperature is lower than the set value, the controller 25 controls the upper oxygen control valve 18 to be opened.

[0032] The raw coal gas mixed with tar and volatile components is discharged from the top of the low-temperature gasification furnace 1 and enters the cyclone separator 12, and the dust in the raw coal gas is separated by the cyclone separator 12, and the separated raw coal gas is sent to the next process for treatment, so that not only high-calorific-value coal gas (high CH4 content) can be produced, but also high-value-added tar products can be obtained, and therefore the system disclosed in the application is the best choice for realizing the efficient utilization of raw coal; the dust separated by the cyclone separator 12 is transported to the inner bottom of the high-temperature gasification furnace 2 by the pneumatic conveying device 13 to be subjected to high-temperature gasification again, so that the dust is fully gasified, the dust is recycled and treated, and the utilization of coal is fully realized.

[0033] The coal cinder after gasification in the high-temperature gasification furnace 2 falls into the quenching tank 3, the cooling water sprayed at the top of the quenching tank 3 quenches the coal cinder, and the mixed liquid of the cooled coal cinder and water falls to the bottom of the quenching tank 3; the liquid level sensor 32 transmits the liquid level signal in the quenching tank 3 to the controller 25 at all times, when the liquid level is higher than the set value, the controller 25 controls the slag pumping control valve 34 to open, under the action of the pressure in the quenching tank 3, the mixed liquid is discharged from the slag pumping pipe 11 to the buffer tank 4; when the liquid level is lower than the set value, the controller 25 controls the slag pumping control valve 34 to close; the fourth temperature sensor 31 in the quenching tank 3 transmits the temperature signal detected in the quenching tank 3 to the controller 25 at all times, when the temperature is higher than the set value, the controller 25 controls the quenching water control valve 33 to open.

[0034] After the mixed liquid in the buffer tank 4 is depressurized, the second slag discharge valve 15 is opened, the mixed liquid falls into the slag grab 5, after the mixed liquid is precipitated, the relatively clean water overflows to the clean water pool 8; the water in the clean water pool 8 is pumped to the quenching tank 3 as quenching water, is reused, realizes water recycling, and avoids waste of water resources; the clean water pool 8 is supplemented with water through the water supplementing pipe 9 periodically.

[0035] The flushing valve 26 is opened periodically to backwash the slag pumping pipe 11, to prevent deposition and blockage in the slag pumping pipe 11; the fluidization valve 27 is opened periodically to fluidize and flush the bottom of the quenching tank 3, to prevent deposition of coal cinder at the bottom of the quenching tank 3; when the slag pumping control valve 34 fails to continuously pump slag, or when the quenching tank 3 needs to be periodically emptied, the water injection valve 28 needs to be opened first to inject water into the buffer tank 4 to increase the pressure, after the pressure increases to a certain value, the water injection valve 28 is closed, the first slag discharge valve 14 is opened, the coal cinder in the quenching tank 3 falls into the buffer tank 4, then the first slag discharge valve 14 is closed, then the emptying valve 30 is opened, the buffer tank 4 is depressurized, after the depressurization, the second slag discharge valve 15 is opened, the coal cinder falls into the slag grab 5.

[0036] The above is the preferred embodiment of the present application, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A coal high-temperature dry distillation gasification system, characterized in that, It includes a low-temperature gasifier, a high-temperature gasifier, a quench tank, a buffer tank, a slag remover, a cyclone separator, and a pneumatic conveying device; A gas outlet is provided at the top of the low-temperature gasifier, and a coal feeding port is provided above the low-temperature gasifier; the coal outlet at the bottom of the low-temperature gasifier is connected to the coal inlet at the top of the high-temperature gasifier; the slag discharge port at the bottom of the high-temperature gasifier is connected to the slag inlet at the top of the quench tank, the slag discharge port at the bottom of the quench tank is connected to the slag inlet at the top of the buffer tank, a first slag discharge valve is provided between the quench tank and the buffer tank, the slag discharge port at the bottom of the buffer tank is connected to the slag inlet of the slag remover, and a second slag discharge valve is provided between the buffer tank and the slag remover. The gas outlet of the low-temperature gasifier is connected to the gas inlet of the cyclone separator. A crude gas outlet is provided at the top of the cyclone separator. The discharge outlet at the bottom of the cyclone separator is connected to the feed inlet of the pneumatic conveying device. The discharge outlet of the pneumatic conveying device is connected to the feed inlet below the high-temperature gasifier. The pneumatic conveying device includes a first vertical pipe, a horizontal pipe, a second vertical pipe, an inclined pipe, and a carbon dioxide gas source; the discharge port at the bottom of the cyclone separator is connected to the inlet end of the first vertical pipe, the outlet end of the first vertical pipe is connected to the upper side wall of one end of the horizontal pipe, the inlet end of the second vertical pipe is connected to the lower side wall of the other end of the horizontal pipe; the outlet end of the second vertical pipe is connected to the inlet end of the inclined pipe, and the outlet end of the inclined pipe is connected to the feed port below the high-temperature gasifier; The carbon dioxide gas source is connected to the air inlet at one end of the horizontal pipe through a gas supply pipe, and the carbon dioxide gas source is connected to the inlet end of the inclined pipe through a gas supply pipe. A gas valve is provided on each of the gas supply pipes.

2. The coal high-temperature dry distillation gasification system according to claim 1, characterized in that, Two coal feeding ports are symmetrically opened above the low-temperature gasifier.

3. A coal high-temperature dry distillation gasification system according to claim 1 or 2, characterized in that, It also includes a steam pipeline and an oxygen pipeline; the outlets of the steam pipeline and the oxygen pipeline are connected to the air inlet at the bottom of the low-temperature gasifier; the outlets of the steam pipeline and the oxygen pipeline are connected to the air inlet above the high-temperature gasifier; and the outlets of the steam pipeline and the oxygen pipeline are connected to the air inlet below the high-temperature gasifier.

4. The coal high-temperature dry distillation gasification system according to claim 3, characterized in that, A first temperature sensor is installed on the top of the low-temperature gasification furnace, and an upper steam control valve and an upper oxygen control valve are respectively installed on the steam pipeline and the oxygen pipeline connected to the low-temperature gasification furnace. A second temperature sensor is installed above the high-temperature gasifier, and a central steam control valve and a central oxygen control valve are respectively installed on the steam pipeline and the oxygen pipeline connected to the air inlet above the high-temperature gasifier. A third temperature sensor is installed below the high-temperature gasifier, and a lower steam control valve and a lower oxygen control valve are respectively installed on the steam pipeline and the oxygen pipeline connected to the lower air inlet of the high-temperature gasifier. The signal output terminals of the first temperature sensor, the second temperature sensor, and the third temperature sensor are all connected to the signal input terminal of the controller via signal communication. The signal output terminal of the controller is connected to the signal input terminals of the upper steam control valve, the upper oxygen control valve, the middle steam control valve, the middle oxygen control valve, the lower steam control valve, and the lower oxygen control valve via signal communication.

5. A coal high-temperature dry distillation gasification system according to claim 1 or 2, characterized in that, It also includes a clear water tank, a water supply pipe, a chilling water pipe, and a slag removal pipe. The overflow port of the slag removal machine is connected to the inlet of the clear water tank, the outlet of the water supply pipe is connected to the inlet of the clear water tank, the outlet of the clear water tank is connected to the inlet at the top of the chilling tank through the chilling water pipe, one end of the slag removal pipe is located at the bottom of the chilling tank, and the other end of the slag removal pipe passes through the upper side wall of the chilling tank and is connected to the slag inlet at the upper side wall of the buffer tank.

6. The coal high-temperature dry distillation gasification system according to claim 5, characterized in that, The outlet of the clear water tank is connected to the side wall of the sludge suction pipe, the bottom of the quench tank, and the top of the buffer tank via pipes; a flushing valve is installed on the pipe between the clear water tank and the sludge suction pipe, a fluidizing valve is installed on the pipe between the clear water tank and the quench tank, and a water injection valve is installed on the pipe between the clear water tank and the buffer tank.

7. The coal high-temperature dry distillation gasification system according to claim 6, characterized in that, A fourth temperature sensor and a liquid level sensor are installed inside the quench tank; a quench water control valve is installed on the quench water pipe; a sludge extraction control valve is installed on the sludge extraction pipe; the signal output terminals of the fourth temperature sensor and the liquid level sensor are both connected to the signal input terminal of the controller via signal communication; the signal output terminal of the controller is connected to the signal input terminals of the quench water control valve and the sludge extraction control valve via signal communication.

8. A coal high-temperature dry distillation gasification system according to claim 1 or 2, characterized in that, A vent pipe is connected to the top of the buffer tank, and a vent valve is installed on the vent pipe.

9. A high-temperature coal dry distillation gasification system according to claim 1, characterized in that, The carbon dioxide gas source is connected to the bottom of the horizontal pipe directly opposite the outlet end of the first vertical pipe via a purge pipe; the carbon dioxide gas source is connected to the upper part of the horizontal pipe directly opposite the inlet end of the second vertical pipe via a purge pipe; the carbon dioxide gas source is connected to the inlet at the other end of the horizontal pipe via a purge pipe; and a purge valve is provided on each purge pipe.

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