A coal pyrolysis system and a coal pyrolysis method

Abstract

The present invention discloses a coal pyrolysis system, comprising: a raw coal screening device, a pulverized coal drying device, an internal-heating vertical furnace, a coke discharging bin, an external-heating rotary furnace and a chemical product recovery device; the raw coal screening device, the lump coal discharging port of which is connected to the upper end of the internal-heating vertical furnace, and the pulverized coal discharging port of which is connected to the pulverized coal drying device; the pulverized coal drying device is connected to the external-heating rotary furnace; the coke discharging bin is located on one side of the internal-heating vertical furnace; a coke discharging port is arranged on the coke discharging bin; one end of the gas outlet pipe of the external-heating rotary furnace is connected to the coke discharging bin; the chemical product recovery device is connected to the gas outlet of the internal-heating vertical furnace. In the present invention, the raw gas generated is transported to the internal-heating vertical furnace by the external-heating rotary furnace, and the internal-heating vertical furnace can carry away the pulverized coal in the raw gas, thereby achieving the effect of dust removal of the raw gas and avoiding system blockage. In addition, the semi-coke in the external-heating rotary furnace can scour the gas outlet pipe, avoiding blockage of the gas outlet pipe. The present invention also provides a coal pyrolysis method.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal pyrolysis, and particularly relates to a coal pyrolysis system and a coal pyrolysis method. Background Art

[0002] Semicoke, commonly known as blue charcoal, has the characteristics of high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur, and low phosphorus. In recent years, the coal low-temperature pyrolysis process with semicoke as the main product has developed rapidly in China because it can partially replace coke (metallurgical coke) and be used in industries such as chemical engineering, smelting, and gas production, and can also be used as clean coal.

[0003] The production of semicoke from low-rank coal mainly uses the internal-heating vertical furnace process. This process is technically mature and has a low investment cost, and has been widely applied. However, since the internal-heating vertical furnace uses the principle of gas hot body carrier heating, the material layer must have sufficient air permeability, and only coal with a particle size of more than 10 mm can be used as raw material. In modern coal mines, the coal with a particle size of less than 10 mm accounts for 30-40% of the total coal production, and this part of the pulverized coal resources cannot be reasonably and effectively utilized.

[0004] In view of the above technical problems, Chinese Patent CN101805625A provides a method for preparing blue charcoal by pyrolyzing raw coal in an external-heating horizontal rotary carbonization furnace. This method uses an external-heating rotary furnace to pyrolyze coal, which belongs to the form of indirect heating, is not limited by the air permeability of the material layer, and has a high tar yield and high gas purity. However, due to the large disturbance of the material layer during the rotation of the rotary furnace, a large amount of dust is carried by the raw gas, which is likely to cause system blockage, and the dust content in the tar is high. At present, large-scale industrial long-term operation has not been achieved. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a coal pyrolysis system and a coal pyrolysis method. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0006] A first aspect of an embodiment of the present invention provides a coal pyrolysis system, including: a raw coal screening device, a pulverized coal drying device, an internal-heating vertical furnace, a coke discharging bin, an external-heating rotary furnace, and a chemical product recovery device;

[0007] The raw coal screening device, the lump coal discharge port is connected to the upper end of the internal-heating vertical furnace, and the pulverized coal discharge port is connected to the pulverized coal drying device;

[0008] The pulverized coal drying device is connected to the external-heating rotary furnace;

[0009] The coke discharging bin is located on one side of the internal-heating vertical furnace and is communicated with the lower part of the internal-heating vertical furnace; a plurality of furnace walls are arranged in the coke discharging bin, and a coke discharging port is arranged on the coke discharging bin;

[0010] One end of the gas outlet pipe of the externally heated rotary furnace is connected to the coke discharging bin;

[0011] The gas outlet pipe, with one end located above the furnace wall, is used to transport the raw gas generated in the externally heated rotary furnace and all or part of the semi-coke after pyrolysis is completed;

[0012] The chemical product recovery device is connected to the gas outlet of the internally heated vertical furnace.

[0013] In an embodiment of the present invention, the externally heated rotary furnace includes: a gas outlet box, a feed chute, a rotary furnace bin, and a gas outlet pipe;

[0014] The gas outlet box is connected to the discharge end of the rotary furnace bin and the other end of the gas outlet pipe;

[0015] One end of the feed chute is connected to the pulverized coal drying device, and the other end is connected to the feed end of the rotary furnace bin.

[0016] In an embodiment of the present invention, the externally heated rotary furnace includes: a gas outlet box, a feed chute, a rotary furnace bin, an internal return device, a discharge box, and a gas outlet pipe;

[0017] The gas outlet box is connected to the feed end of the rotary furnace bin and the other end of the gas outlet pipe;

[0018] One end of the feed chute is connected to the pulverized coal drying device, and the other end is connected to the feed end of the rotary furnace bin;

[0019] The discharge end of the rotary furnace bin is connected to the discharge box;

[0020] The internal return device is arranged in the rotary furnace bin and extends into the gas outlet box.

[0021] In an embodiment of the present invention, it further includes: a waste heat boiler, a hot semi-coke conveying device, and a semi-coke cooling device;

[0022] The feed end of the waste heat boiler is connected to the coke discharging port;

[0023] The hot semi-coke conveying device is connected to the discharge end of the waste heat boiler;

[0024] The semi-coke cooling device is connected to the hot semi-coke conveying device and the discharge box.

[0025] In an embodiment of the present invention, the gas outlet box includes: a first hopper; the gas outlet pipe includes: a first gas outlet sub-pipe;

[0026] The first hopper is communicated with the other end of the first gas outlet sub-pipe;

[0027] One end of the first gas outlet sub-pipe is connected to the coke discharging bin;

[0028] A first electric valve is provided at a position of the first gas outlet pipe close to the first hopper.

[0029] In an embodiment of the present invention, the gas outlet box further includes: a second hopper; the gas outlet pipe further includes: a second gas outlet pipe;

[0030] The second hopper is communicated with the other end of the second gas outlet pipe;

[0031] One end of the second gas outlet pipe is connected to the coke discharging bin;

[0032] A second electric valve is provided at a position of the second gas outlet pipe close to the second hopper.

[0033] A second aspect of the embodiment of the present invention provides a coal pyrolysis method, including the following steps:

[0034] Step 10, the blended coal is screened by a raw coal screening device into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm, or screened into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm;

[0035] Step 20, the lump coal enters an internal heating type vertical furnace for pyrolysis;

[0036] Step 30, the pulverized coal enters a pulverized coal drying device for drying, and the dried pulverized coal enters an external heating type rotary furnace for pyrolysis;

[0037] Step 40, the raw gas generated during the pyrolysis of the external heating type rotary furnace and all or part of the semi-coke after the pyrolysis are entered into the coke discharging bin through the gas outlet pipe;

[0038] Step 51, the raw gas entering the coke discharging bin and the raw gas generated in the internal heating type vertical furnace both enter the chemical product recovery device;

[0039] Step 52, the chemical product recovery device purifies and separates the raw gas to obtain tar and gas.

[0040] In an embodiment of the present invention, in step 40, when the raw gas and part of the semi-coke after the pyrolysis enter the coke discharging bin through the gas outlet pipe, step 40 includes:

[0041] Step 401, the dried pulverized coal enters the rotary furnace bin of the external heating type rotary furnace for pyrolysis, a part of the semi-coke after the pyrolysis enters the gas outlet box through the return device, another part of the semi-coke enters the discharge box, and the raw gas generated during the pyrolysis also enters the gas outlet box;

[0042] Step 402, the semi-coke and the raw gas in the gas outlet box enter the coke discharging bin through the gas outlet pipe.

[0043] In one embodiment of the present invention, it further includes:

[0044] Step 53: Part of the coal gas obtained through the chemical product recovery device is transported to the internal heat type vertical furnace as the heat source gas for combustion, and the other part of the coal gas is transported to the combustion device of the external heat type rotary furnace as the heat source gas for combustion;

[0045] Step 60: The semicoke produced by pyrolysis in the internal heat type vertical furnace enters the coke discharging bin, and the semicoke in the coke discharging bin and the semicoke in the internal heat type vertical furnace enter the waste heat boiler together for cooling to below 300 °C;

[0046] Step 70: The cooled semicoke enters the hot semicoke conveying device, is transported to the semicoke cooling device, and is discharged after being cooled to below 80 °C; the semicoke in the discharging box also enters the semicoke cooling device and is discharged after being cooled to below 80 °C.

[0047] In one embodiment of the present invention, the specific steps of step 402 include: by controlling the first electric valve and the second electric valve to open and close alternately, so that the semicoke and raw coal gas in the gas outlet box enter the coke discharging bin through the first gas outlet sub-pipe and the second gas outlet sub-pipe alternately.

[0048] Advantages of the present invention:

[0049] 1. In the present invention, all or part of the semicoke after pyrolysis in the external heat type rotary furnace and the raw coal gas generated in the external heat type rotary furnace are transported to the coke discharging bin of the internal heat type vertical furnace through the gas outlet pipe of the external heat type rotary furnace. The raw coal gas enters the internal heat type vertical furnace through the coke discharging bin and can exchange heat, releasing heat into the internal heat type vertical furnace for the internal heat type vertical furnace to use; at the same time, since the lump coal and semicoke in the internal heat type vertical furnace will move, the pulverized coal in this part of the raw coal gas entering can be carried away, thereby achieving the effect of dust removal for the raw coal gas and avoiding system blockage. In addition, the raw coal gas and semicoke in the external heat type rotary furnace will pass through the gas outlet pipe at the same time, and the semicoke will play a role in scouring the gas outlet pipe, avoiding blockage of the gas outlet pipe.

[0050] 2. The present invention uses the internal heat type vertical furnace and the external heat type rotary furnace to process raw coal respectively, realizing the simultaneous pyrolysis of lump coal and pulverized coal, and realizing the comprehensive processing efficiency and utilization rate of coal.

[0051] The following will further describe the present invention in detail with reference to the drawings and embodiments. Description of the Drawings

[0052] Figure 1 is a schematic structural diagram of a coal pyrolysis system provided by an embodiment of the present invention;

[0053] Figure 2 is a schematic structural diagram of the coke discharging bin of a coal pyrolysis system provided by an embodiment of the present invention;

[0054] Figure 3 It is a schematic structural diagram of a coal pyrolysis system provided by an embodiment of the present invention;

[0055] Figure 4 It is a schematic structural diagram of a coal pyrolysis system provided by an embodiment of the present invention;

[0056] Figure 5 It is a schematic structural diagram of a coal pyrolysis system provided by an embodiment of the present invention;

[0057] Figure 6 It is a schematic structural diagram of a coal pyrolysis system provided by an embodiment of the present invention;

[0058] Figure 7 It is a schematic structural diagram of another coal pyrolysis system provided by an embodiment of the present invention;

[0059] Figure 8 It is a flowchart of a coal pyrolysis method provided by an embodiment of the present invention.

[0060] Explanation of reference numerals:

[0061] 100 - Raw coal screening device; 200 - Pulverized coal drying device; 300 - Inner - heat vertical furnace; 400 - Coke discharging bin; 410 - Furnace wall; 420 - Coke discharging port; 500 - Outer - heat rotary furnace; 510 - Exhaust pipe; 511 - First exhaust sub - pipe; 512 - First electric valve; 513 - Second exhaust sub - pipe; 514 - Second electric valve; 520 - Exhaust gas box; 521 - First hopper; 522 - Second hopper; 530 - Feed chute; 540 - Rotary furnace bin; 550 - Inner return material device; 560 - Discharge box; 600 - Chemical product recovery device; 700 - Waste heat boiler; 800 - Hot semi - coke conveying device; 900 - Semi - coke cooling device. Detailed implementation manners

[0062] The following further describes the present invention in detail with reference to specific embodiments, but the implementation manners of the present invention are not limited thereto.

[0063] Embodiment 1

[0064] The first aspect of the embodiment of the present invention provides a coal pyrolysis system. Please refer to Figure 1 and Figure 2, a coal pyrolysis system, comprising: a raw coal screening device 100, a pulverized coal drying device 200, an internally heated vertical furnace 300, a coke discharging bin 400, an externally heated rotary furnace 500, and a chemical product recovery device 600. The lump coal discharging port of the raw coal screening device 100 is connected to the upper end of the internally heated vertical furnace 300, and the pulverized coal discharging port of the raw coal screening device 100 is connected to the pulverized coal drying device 200. The lump coal discharging port of the raw coal screening device 100 can communicate with the upper end of the internally heated vertical furnace 300, and the pulverized coal discharging port of the raw coal screening device 100 can communicate with the pulverized coal drying device 200. The raw coal is screened by the raw coal screening device 100 into lump coal and pulverized coal. The lump coal directly enters the internally heated vertical furnace 300 for pyrolysis, and the pulverized coal enters the pulverized coal drying device 200 for drying. The pulverized coal drying device 200 is connected to the externally heated rotary furnace 500. The pulverized coal drying device 200 can communicate with the externally heated rotary furnace 500, and the dried pulverized coal enters the externally heated rotary furnace 500 for pyrolysis. The coke discharging bin 400 is located on one side of the internally heated vertical furnace 300, and the coke discharging bin 400 communicates with the lower part of the internally heated vertical furnace 300. A plurality of furnace walls 410 are arranged in the coke discharging bin 400, and a coke discharging port 420 is arranged on the coke discharging bin 400. The coke discharging port 420 is located below the furnace wall 410. The semi-coke in the internally heated vertical furnace 300 can be discharged out of the internally heated vertical furnace 300 through the coke discharging bin 400. One end of the gas outlet pipe 510 of the externally heated rotary furnace 500 is connected to the coke discharging bin 400. The gas outlet pipe 510 can communicate with the coke discharging bin 400. One end of the gas outlet pipe 510 is located above the furnace wall 410, and is used for transporting the raw gas and all or part of the semi-coke after pyrolysis generated in the externally heated rotary furnace 500. The raw gas and semi-coke generated in the internally heated vertical furnace can enter the coke discharging bin 400 through the gas outlet pipe 510, and then enter the coke discharging port 420. The raw gas enters the internally heated vertical furnace 300. The gas outlet pipe 510 of the externally heated rotary furnace 500 transports all or part of the semi-coke after pyrolysis in the externally heated rotary furnace 500 and the raw gas generated in the externally heated rotary furnace 500 to the coke discharging bin 400 of the internally heated vertical furnace 300. The raw gas can be heat-exchanged after entering the internally heated vertical furnace 300 through the coke discharging bin 400, releasing heat to the internally heated vertical furnace 300 for use in the internally heated vertical furnace 300, improving the thermal efficiency of the system. At the same time, since the lump coal and semi-coke in the internally heated vertical furnace 300 will move, the pulverized coal in this part of the raw gas entering can be carried away, thereby achieving the effect of dust removal for the raw gas and avoiding system blockage. In addition, the raw gas and semi-coke in the externally heated rotary furnace 500 will pass through the gas outlet pipe 510 at the same time, and the semi-coke will scour the gas outlet pipe 510, which can prevent the dust-containing raw gas of the externally heated rotary furnace 500 from blocking the gas outlet pipe 510, further improving the reliability of the system operation and extending the service life of the system.The chemical product recovery device 600 is connected to the gas outlet of the internal heat type vertical furnace 300. The chemical product recovery device 600 can communicate with the gas outlet of the internal heat type vertical furnace 300. The raw gas generated in the internal heat type vertical furnace 300 and the raw gas entering the internal heat type vertical furnace 300 from the external heat type rotary furnace 500 both enter the chemical product recovery device 600 from the gas outlet of the internal heat type vertical furnace 300 for purification and separation, and tar and gas can be obtained. The obtained gas can also be recovered and utilized as the heat source gas for the internal heat type vertical furnace 300 and the external heat type rotary furnace 500. The gas burns and releases heat for the use of the internal heat type vertical furnace 300 and the external heat type rotary furnace 500, saving energy. The coal pyrolysis system of this embodiment can realize the simultaneous pyrolysis of lump coal and pulverized coal, improving the comprehensive treatment efficiency and utilization rate of coal.

[0065] In a feasible implementation manner, the installation method of the external heat type rotary furnace 500 is horizontal, and the heating method is the form of external heating of the jacket.

[0066] Embodiment 2

[0067] As Figure 3 shown, this embodiment is an improvement based on Embodiment 1. The external heat type rotary furnace 500 includes: an air outlet box 520, a feed chute 530, a rotary furnace chamber 540, an internal return device 550, a discharge box 560, and an air outlet pipe 510. One end of the feed chute 530 is connected to the pulverized coal drying device 200, and the other end of the feed chute 530 is connected to the feed end of the rotary furnace chamber 540. One end of the feed chute 530 can communicate with the pulverized coal drying device 200, and the other end of the feed chute 530 can communicate with the feed end of the rotary furnace chamber 540. The pulverized coal dried in the pulverized coal drying device 200 enters the rotary furnace chamber 540 through the feed chute 530. The air outlet box 520 is connected to the feed end of the rotary furnace chamber 540, and the air outlet box 520 is connected to the other end of the air outlet pipe 510. The air outlet box 520 can communicate with the air outlet pipe 510. The internal return device 550 is arranged in the rotary furnace chamber 540, and the internal return device 550 extends into the air outlet box 520. Specifically, the discharge side of the internal return device 550 extends into the air outlet box 520. The discharge end of the rotary furnace chamber 540 is connected to the feed port of the discharge box 560. The pulverized coal is pyrolyzed in the rotary furnace chamber 540. The internal return device 550 in the rotary furnace chamber 540 transports a small part of the semicoke after pyrolysis to the air outlet box 520, and the remaining semicoke enters the discharge box 560 from the discharge end of the rotary furnace chamber 540 and is transported to the outside of the external heat type rotary furnace 500 through the discharge box 560. Among them, the internal return device 550 can return 5% - 20% of the semicoke to the air outlet box 520, and the raw gas generated in the rotary furnace chamber 540 also enters the air outlet box 520. The remaining 80% - 95% of the semicoke can enter the discharge box 560 from the discharge end of the rotary furnace chamber 540 and be discharged. The semicoke and raw gas in the air outlet box 520 enter the coke discharge bin 400 for subsequent treatment.

[0068] In a feasible implementation manner, one end of the gas outlet pipe 510 extends into the coke discharging bin 400, and one end of the gas outlet pipe 510 is of a flared structure.

[0069] Furthermore, as Figure 4 shown, a coal pyrolysis system further includes: a waste heat boiler 700, a hot semicoke conveying device 800, and a semicoke cooling device 900. The feeding end of the waste heat boiler 700 is connected to the coke discharging port 420. The feeding end of the waste heat boiler 700 can be communicated with the coke discharging port 420. The semicoke produced in the internally heated vertical furnace 300 and the semicoke entering the coke discharging bin 400 from the externally heated rotary furnace 500 both enter the waste heat boiler 700 from the coke discharging port 420 for cooling. The waste heat boiler 700 can cool the semicoke to below 300 °C. The hot semicoke conveying device 800 is connected to the discharging end of the waste heat boiler 700. The semicoke cooled in the waste heat boiler 700 enters the hot semicoke conveying device 800 for conveying to the semicoke cooling device 900. The semicoke cooling device 900 is connected to the hot semicoke conveying device 800, and the semicoke cooling device 900 is connected to the discharging port of the discharging box 560. Most of the semicoke that is not carried away by the internal return device 550 in the internally heated rotary furnace can enter the semicoke cooling device 900 from the discharging box 560, and the semicoke cooling device 900 can cool the semicoke to below 80 °C. Figure 4 The arrows in

[0070] Furthermore, as Figure 5 shown, the gas outlet box 520 includes: a first hopper 521. The gas outlet pipe 510 includes: a first gas outlet sub-pipe 511. The first hopper 521 is communicated with the other end of the first gas outlet sub-pipe 511, and one end of the first gas outlet sub-pipe 511 is connected to the coke discharging bin 400. A first electric valve 512 is arranged at a position of the first gas outlet sub-pipe 511 close to the first hopper 521. The first hopper 521 is connected to the rotary furnace bin 540. Specifically, the first hopper 521 is connected to the feeding end of the rotary furnace bin 540. The discharging side of the internal return device 550 can extend into the first hopper 521. One end of the first gas outlet sub-pipe 511 is connected to the coke discharging bin 400, and the other end of the first gas outlet sub-pipe 511 is connected to the first hopper 521. The first gas outlet sub-pipe 511 can be communicated with the coke discharging bin 400 and the first hopper 521. A first electric valve 512 is arranged at the upper part of the first gas outlet sub-pipe 511 close to the first hopper 521. In this embodiment, the first electric valve 512 can be opened and closed at intervals. When there is more semicoke stored in the first hopper 521, the first electric valve 512 is opened. At this time, the semicoke in the first hopper 521 enters the first gas outlet sub-pipe 511, which can scour the first gas outlet sub-pipe 511 to avoid blockage of the first gas outlet sub-pipe 511.

[0071] Furthermore, asFigure 6 As shown, the gas outlet box 520 further includes: a second hopper 522; the gas outlet pipe 510 further includes: a second gas outlet sub-pipe 513. The second hopper 522 communicates with the other end of the second gas outlet sub-pipe 513. One end of the second gas outlet sub-pipe 513 is connected to the coke discharging bin 400. A second electric valve 514 is provided at a position of the second gas outlet sub-pipe 513 close to the second hopper 522. The second hopper 522 is connected to the rotary furnace bin 540. Specifically, the second hopper 522 is connected to the feeding end of the rotary furnace bin 540. The discharging side of the internal return material device 550 can extend into the first hopper 521 and the second hopper 522. One end of the second gas outlet sub-pipe 513 is connected to the coke discharging bin 400, and the other end of the second gas outlet sub-pipe 513 is connected to the second hopper 522. The second gas outlet sub-pipe 513 can communicate with the coke discharging bin 400 and the second hopper 522. A second electric valve 514 is provided at the upper part of the second gas outlet sub-pipe 513 close to the second hopper 522. In this embodiment, the second electric valve 514 can be opened and closed at intervals. When there is more semicoke stored in the second hopper 522, the second electric valve 514 is opened. At this time, the semicoke in the second hopper 522 enters the second gas outlet sub-pipe 513, which can scour the second gas outlet sub-pipe 513 to avoid blockage of the second gas outlet sub-pipe 513. In this embodiment, the first electric valve 512 and the second electric valve 514 can be alternately opened and closed to alternately scour the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513.

[0072] In a feasible implementation manner, a three-way distribution valve can be provided at the discharging end of the internal return material device 550, and the three-way distribution valve communicates with the first hopper 521 and the second hopper 522 respectively. When the first electric valve 512 is closed and the second electric valve 514 is opened, the channel of the three-way distribution valve communicating with the first hopper 521 is opened, and the internal return material device 550 returns materials to the first hopper 521, and semicoke can accumulate in the first hopper 521. At this time, the raw gas can enter the coke discharging bin 400 from the second hopper 522 and the second gas outlet sub-pipe 513. When a certain amount of semicoke accumulates in the first hopper 521, the first electric valve 512 is opened, and the semicoke in the first hopper 521 enters the coke discharging bin 400 through the first gas outlet sub-pipe 511. At the same time, the second electric valve 514 is closed, and the channel of the three-way distribution valve communicating with the second hopper 522 is opened, and the internal return material device 550 returns materials to the second hopper 522, and semicoke can accumulate in the second hopper 522. At this time, the raw gas can enter the coke discharging bin 400 from the first hopper 521 and the first gas outlet sub-pipe 511.

[0073] Embodiment III

[0074] As Figure 7 ​As shown, the difference from the second embodiment above is that the internal return device 550 is not provided in the rotary furnace chamber 540. The gas outlet box 520 is located at the discharge end of the rotary furnace chamber 540. All the semicoke pyrolyzed in the rotary furnace chamber 540 enters the gas outlet box 520, enters the gas outlet pipe 510 from the gas outlet box 520, and then enters the coke discharging bin 400. Specifically, the externally heated rotary furnace 500 includes: a gas outlet box 520, a feed chute 530, a rotary furnace chamber 540, and a gas outlet pipe 510. The gas outlet box 520 is connected to the discharge end of the rotary furnace chamber 540 and the other end of the gas outlet pipe 510. One end of the feed chute 530 is connected to the pulverized coal drying device 200, and the other end of the feed chute 530 is connected to the feed end of the rotary furnace chamber 540.

[0075] Further, as Figure 7 shown, the feed end of the waste heat boiler 700 is connected to the coke discharging port 420. The feed end of the waste heat boiler 700 can be communicated with the coke discharging port 420. The semicoke produced in the internally heated vertical furnace 300 and the semicoke entering the coke discharging bin 400 from the externally heated rotary furnace 500 both enter the waste heat boiler 700 from the coke discharging port 420 for cooling. The hot semicoke conveying device 800 is connected to the discharge end of the waste heat boiler 700, and the semicoke cooling device 900 is connected to the hot semicoke conveying device 800. The semicoke cooled in the waste heat boiler 700 enters the hot semicoke conveying device 800 and is then conveyed to the semicoke cooling device 900. The semicoke cooling device 900 can cool the semicoke to below 80°C.

[0076] Further, as Figure 5 shown, the gas outlet box 520 includes: a first hopper 521. The gas outlet pipe 510 includes: a first gas outlet sub-pipe 511. The first hopper 521 is communicated with the other end of the first gas outlet sub-pipe 511, and one end of the first gas outlet sub-pipe 511 is connected to the coke discharging bin 400. A first electric valve 512 is provided at a position of the first gas outlet sub-pipe 511 close to the first hopper 521. Specifically, the first hopper 521 is connected to the discharge end of the rotary furnace chamber 540, one end of the first gas outlet sub-pipe 511 is connected to the coke discharging bin 400, and the other end of the first gas outlet sub-pipe 511 is connected to the first hopper 521. In this embodiment, the first electric valve 512 can be opened and closed at intervals. When there is a relatively large amount of semicoke in the first hopper 521, the first electric valve 512 is opened. At this time, the semicoke in the first hopper 521 enters the first gas outlet sub-pipe 511, which can scour the first gas outlet sub-pipe 511 to avoid blockage of the first gas outlet sub-pipe 511.

[0077] Further, as Figure 6As shown in the figure, the gas outlet box 520 further includes: a second hopper 522; the gas outlet pipe 510 further includes: a second gas outlet sub-pipe 513. The second hopper 522 communicates with the other end of the second gas outlet sub-pipe 513. One end of the second gas outlet sub-pipe 513 is connected to the coke discharging bin 400. A second electric valve 514 is provided at a position of the second gas outlet sub-pipe 513 close to the second hopper 522. The second hopper 522 is connected to the rotary furnace bin 540. Specifically, the second hopper 522 is connected to the discharging end of the rotary furnace bin 540. One end of the second gas outlet sub-pipe 513 is connected to the coke discharging bin 400, and the other end of the second gas outlet sub-pipe 513 is connected to the second hopper 522. The second gas outlet sub-pipe 513 can communicate with the coke discharging bin 400 and the second hopper 522. In this embodiment, the second electric valve 514 can be opened and closed at intervals. When there is a relatively large amount of semicoke in the second hopper 522, the second electric valve 514 is opened. At this time, the semicoke in the second hopper 522 enters the second gas outlet sub-pipe 513, which can flush the second gas outlet sub-pipe 513 to avoid blockage of the second gas outlet sub-pipe. In this embodiment, the first electric valve 512 and the second electric valve 514 can be opened and closed alternately to flush the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 alternately.

[0078] In a feasible implementation manner, a three-way distribution valve can be provided at the discharging end of the rotary furnace bin 540, and the three-way distribution valve communicates with the first hopper 521 and the second hopper 522 respectively. When the first electric valve 512 is closed and the second electric valve 514 is opened, the channel of the three-way distribution valve communicating with the first hopper 521 is opened, and the internal return material device 550 returns materials to the first hopper 521. Semicoke can accumulate in the first hopper 521. At this time, the raw coal gas can enter the coke discharging bin 400 from the second hopper 522 and the second gas outlet sub-pipe 513. When a certain amount of semicoke accumulates in the first hopper 521, the first electric valve 512 is opened, and the semicoke in the first hopper 521 enters the coke discharging bin 400 through the first gas outlet sub-pipe 511. At the same time, the second electric valve 514 is closed, and the channel of the three-way distribution valve communicating with the second hopper 522 is opened, and the internal return material device 550 returns materials to the second hopper 522. Semicoke can accumulate in the second hopper 522. At this time, the raw coal gas can enter the coke discharging bin 400 from the first hopper 521 and the first gas outlet sub-pipe 511.

[0079] Embodiment 4

[0080] As Figure 8 shown, the second aspect of the embodiment of the present invention provides a coal pyrolysis method, including the following steps:

[0081] Step 10, the blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm, or screened into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0082] Step 20, the lump coal enters the internal heat type vertical furnace 300 for pyrolysis.

[0083] Step 30, the pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the external heat type rotary furnace 500 for pyrolysis.

[0084] Step 40, the raw gas generated during the pyrolysis process of the external heat type rotary furnace 500 and all or part of the semi-coke after the pyrolysis are introduced into the coke discharging bin 400 through the gas outlet pipe 510.

[0085] Step 51, the raw gas entering the coke discharging bin 400 and the raw gas generated in the internal heat type vertical furnace 300 both enter the chemical product recovery device 600.

[0086] Step 52, the chemical product recovery device 600 purifies and separates the raw gas to obtain tar and gas.

[0087] Example Five

[0088] A coal pyrolysis method includes the following steps:

[0089] Step 10, the blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm, or screened into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0090] Step 20, the lump coal enters the internal heat type vertical furnace 300 for pyrolysis.

[0091] Step 30, the pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the external heat type rotary furnace 500 for pyrolysis. Among them, the pulverized coal is dried to a moisture content of less than 7%.

[0092] Step 401, the dried pulverized coal enters the rotary furnace chamber 540 of the external heat type rotary furnace 500 for pyrolysis. 5% to 20% of the semi-coke after the pyrolysis enters the gas outlet box 520 through the return material device, and 80% to 95% of the semi-coke enters the discharge box 560. The raw gas generated during the pyrolysis process also enters the gas outlet box 520.

[0093] Step 402, the semi-coke and the raw gas in the gas outlet box 520 enter the coke discharging bin 400 through the gas outlet pipe 510.

[0094] In this embodiment, the specific steps of step 402 include: by controlling the alternating opening and closing of the first electric valve 512 and the second electric valve 514, the semicoke and raw coal gas in the gas outlet box 520 alternately enter the coke discharging bin 400 through the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513. In this embodiment, the first electric valve 512 and the second electric valve 514 can alternately open and close, respectively flushing the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 alternately, and the alternating opening and closing interval time of the first electric valve 512 and the second electric valve 514 is 10 min to 20 min.

[0095] When the first electric valve 512 is closed and the second electric valve 514 is opened, semicoke can accumulate in the first hopper 521. At this time, the raw coal gas can enter the coke discharging bin 400 from the second hopper 522 and the second gas outlet sub-pipe 513. When a certain amount of semicoke accumulates in the first hopper 521, the first electric valve 512 is opened, and the semicoke in the first hopper 521 enters the coke discharging bin 400 through the first gas outlet sub-pipe 511. At the same time, the second electric valve 514 is closed, and the channel of the three-way distribution valve communicating with the second hopper 522 is opened, and the internal return material device 550 returns materials to the second hopper 522, and semicoke can accumulate in the second hopper 522. At this time, the raw coal gas can enter the coke discharging bin 400 from the first hopper 521 and the first gas outlet sub-pipe 511.

[0096] In a feasible implementation manner, a three-way distribution valve can be arranged at the discharging end of the internal return material device 550, and the three-way distribution valve is respectively communicated with the first hopper 521 and the second hopper 522. When the first electric valve 512 is closed and the second electric valve 514 is opened, the channel of the three-way distribution valve communicating with the first hopper 521 is opened, and the internal return material device 550 returns materials to the first hopper 521, and semicoke can accumulate in the first hopper 521. At this time, the raw coal gas can enter the coke discharging bin 400 from the second hopper 522 and the second gas outlet sub-pipe 513. When a certain amount of semicoke accumulates in the first hopper 521, the first electric valve 512 is opened, the second electric valve 514 is closed, the channel of the three-way distribution valve communicating with the second hopper 522 is opened, and the internal return material device 550 returns materials to the second hopper 522, and semicoke can accumulate in the second hopper 522. At this time, the raw coal gas can enter the coke discharging bin 400 from the first hopper 521 and the first gas outlet sub-pipe 511.

[0097] Step 51, the raw coal gas entering the coke discharging bin 400 and the raw coal gas generated in the internal heat type vertical furnace 300 both enter the chemical product recovery device 600.

[0098] Step 52, the chemical product recovery device 600 purifies and separates the raw coal gas to obtain tar and coal gas.

[0099] Step 53: Part of the coal gas obtained by the chemical product recovery device 600 is transported to the internal heat type vertical furnace 300 and burned as heat source gas, and the other part of the coal gas is transported to the combustion device of the external heat type rotary furnace 500 and burned as heat source gas.

[0100] Step 60: The semicoke produced by pyrolysis in the internal heat type vertical furnace 300 enters the coke discharging bin 400, and the semicoke in the coke discharging bin 400 all enters the waste heat boiler 700 to be cooled to below 400 °C.

[0101] Step 70: The cooled semicoke enters the hot semicoke conveying device 800 and is transported to the semicoke cooling device 900, and is discharged after being cooled to below 80 °C; the semicoke in the discharging box 560 also enters the semicoke cooling device 900 and is discharged after being cooled to below 80 °C.

[0102] Example Six

[0103] A coal pyrolysis method includes the following steps:

[0104] Step 10: The blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0105] Step 20: The lump coal enters the internal heat type vertical furnace 300 for pyrolysis.

[0106] Step 30: The pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the external heat type rotary furnace 500 for pyrolysis. Among them, the pulverized coal is dried to a moisture content of less than 7%.

[0107] Step 401: The dried pulverized coal enters the rotary furnace bin 540 of the external heat type rotary furnace 500 for pyrolysis. 5% of the semicoke after pyrolysis enters the gas outlet box 520 through the return material device, and 95% of the semicoke enters the discharging box 560. The raw coal gas generated during the pyrolysis process also enters the gas outlet box 520.

[0108] Step 402: The semicoke and raw coal gas in the gas outlet box 520 enter the coke discharging bin 400 through the gas outlet pipe 510.

[0109] In this embodiment, the specific steps of step 402 include: by controlling the alternating opening and closing of the first electric valve 512 and the second electric valve 514, the semi-coke and raw gas in the gas outlet box 520 alternately pass through the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 and enter the coke discharging bin 400. In this embodiment, the first electric valve 512 and the second electric valve 514 can alternately open and close, respectively flushing the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 alternately, and the alternating opening and closing interval time of the first electric valve 512 and the second electric valve 514 is 20 min. The specific process of step 402 is the same as that in the fifth embodiment above.

[0110] Step 51, the raw gas entering the coke discharging bin 400 and the raw gas generated in the internal heating type vertical furnace 300 both enter the chemical product recovery device 600.

[0111] Step 52, the chemical product recovery device 600 purifies and separates the raw gas to obtain tar and gas.

[0112] Step 53, for the gas obtained by the chemical product recovery device 600, part of the gas is transported to the internal heating type vertical furnace 300 as heat source gas for combustion, and the other part of the gas is transported to the combustion device of the external heating type rotary furnace 500 as heat source gas for combustion.

[0113] Step 60, the semi-coke generated by pyrolysis in the internal heating type vertical furnace 300 enters the coke discharging bin 400, and together with the semi-coke in the coke discharging bin 400, enters the waste heat boiler 700 to be cooled to below 200 °C.

[0114] Step 70, the cooled semi-coke enters the hot semi-coke conveying device 800, is transported to the semi-coke cooling device 900, and is discharged after being cooled to below 50 °C; the semi-coke in the discharging box 560 also enters the semi-coke cooling device 900 and is discharged after being cooled to below 50 °C.

[0115] Embodiment Seven

[0116] A coal pyrolysis method includes the following steps:

[0117] Step 10, the blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0118] Step 20, the lump coal enters the internal heating type vertical furnace 300 for pyrolysis.

[0119] Step 30, the pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the external heating type rotary furnace 500 for pyrolysis. Among them, the pulverized coal is dried to a moisture content of less than 6%.

[0120] Step 401: The pulverized coal after drying enters the rotary furnace chamber 540 of the externally heated rotary furnace 500 for pyrolysis. 10% of the semicoke after pyrolysis enters the gas outlet box 520 through the return material device, and 90% of the semicoke enters the discharge box 560. The raw gas generated during the pyrolysis process also enters the gas outlet box 520.

[0121] Step 402: The semicoke and raw gas in the gas outlet box 520 enter the coke discharging bin 400 through the gas outlet pipe 510.

[0122] In this embodiment, the specific steps of step 402 include: by controlling the alternating opening and closing of the first electric valve 512 and the second electric valve 514, the semicoke and raw gas in the gas outlet box 520 alternately enter the coke discharging bin 400 through the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513. In this embodiment, the first electric valve 512 and the second electric valve 514 can alternately open and close, respectively flushing the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 alternately. The alternating opening and closing interval time of the first electric valve 512 and the second electric valve 514 is 15 min. The specific process of step 402 is the same as that in the fifth above-mentioned embodiment.

[0123] Step 51: The raw gas entering the coke discharging bin 400 and the raw gas generated in the internally heated vertical furnace 300 both enter the chemical product recovery device 600.

[0124] Step 52: The chemical product recovery device 600 purifies and separates the raw gas to obtain tar and gas.

[0125] Step 53: For the gas obtained by the chemical product recovery device 600, part of the gas is transported to the internally heated vertical furnace 300 as the heat source gas for combustion, and the other part of the gas is transported to the combustion device of the externally heated rotary furnace 500 as the heat source gas for combustion.

[0126] Step 60: The semicoke generated after pyrolysis in the internally heated vertical furnace 300 enters the coke discharging bin 400 and enters the waste heat boiler 700 together with the semicoke in the coke discharging bin 400 for cooling to below 250 °C.

[0127] Step 70: The cooled semicoke enters the hot semicoke conveying device 800 and is transported to the semicoke cooling device 900, and is discharged after being cooled to below 60 °C; the semicoke in the discharge box 560 also enters the semicoke cooling device 900 and is discharged after being cooled to below 60 °C.

[0128] Embodiment Eight

[0129] A coal pyrolysis method includes the following steps:

[0130] Step 10, the blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0131] Step 20, the lump coal enters the internal heating vertical furnace 300 for pyrolysis.

[0132] Step 30, the pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the external heating rotary furnace 500 for pyrolysis. Among them, the pulverized coal is dried to a moisture content of less than 5%.

[0133] Step 401, the dried pulverized coal enters the rotary furnace chamber 540 of the external heating rotary furnace 500 for pyrolysis. 20% of the semicoke after pyrolysis enters the gas outlet box 520 through the return material device, and 80% of the semicoke enters the discharge box 560. The raw gas generated during the pyrolysis process also enters the gas outlet box 520.

[0134] Step 402, the semicoke and raw gas in the gas outlet box 520 enter the coke discharging bin 400 through the gas outlet pipe 510.

[0135] In this embodiment, the specific steps of step 402 include: by controlling the first electric valve 512 and the second electric valve 514 to open and close alternately, so that the semicoke and raw gas in the gas outlet box 520 alternately enter the coke discharging bin 400 through the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513. In this embodiment, the first electric valve 512 and the second electric valve 514 can open and close alternately, and alternately flush the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 respectively. The alternating opening and closing interval time of the first electric valve 512 and the second electric valve 514 is 10 min. The specific process of step 402 is the same as that in the fifth above-mentioned embodiment.

[0136] Step 51, the raw gas entering the coke discharging bin 400 and the raw gas generated in the internal heating vertical furnace 300 both enter the chemical product recovery device 600.

[0137] Step 52, the chemical product recovery device 600 purifies and separates the raw gas to obtain tar and gas.

[0138] Step 53, for the gas obtained by the chemical product recovery device 600, part of the gas is transported to the internal heating vertical furnace 300 for combustion as the heat source gas, and the other part of the gas is transported to the combustion device of the external heating rotary furnace 500 for combustion as the heat source gas.

[0139] Step 60, the semicoke generated after pyrolysis in the internal heating vertical furnace 300 enters the coke discharging bin 400 and enters the waste heat boiler 700 together with the semicoke in the coke discharging bin 400 for cooling to below 300 °C.

[0140] Step 70, the cooled semicoke enters the hot semicoke conveying device 800 and is conveyed to the semicoke cooling device 900, and is discharged after being cooled to below 70°C; the semicoke in the discharge box 560 also enters the semicoke cooling device 900 and is discharged after being cooled to below 70°C.

[0141] Example Nine

[0142] A coal pyrolysis method includes the following steps: The difference from the above embodiment is that all the semicoke produced in the externally heated rotary furnace 500 enters the gas outlet box 520.

[0143] Step 10, the blended coal is screened by the raw coal screening device 100 into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm, or screened into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm.

[0144] Step 20, the lump coal enters the internally heated vertical furnace 300 for pyrolysis.

[0145] Step 30, the pulverized coal enters the pulverized coal drying device 200 for drying, and the dried pulverized coal enters the externally heated rotary furnace 500 for pyrolysis. Among them, the pulverized coal is dried to a moisture content of less than 5%.

[0146] Step 401, the dried pulverized coal enters the rotary furnace chamber 540 of the externally heated rotary furnace 500 for pyrolysis, and all the semicoke after pyrolysis is completed enters the gas outlet box 520, and the raw gas generated during the pyrolysis process also enters the gas outlet box 520.

[0147] Step 402, the semicoke and raw gas in the gas outlet box 520 enter the coke discharging bin 400 through the gas outlet pipe 510.

[0148] In this embodiment, the specific steps of step 402 include: By controlling the alternating opening and closing of the first electric valve 512 and the second electric valve 514, the semicoke and raw gas in the gas outlet box 520 alternately enter the coke discharging bin 400 through the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513. In this embodiment, the first electric valve 512 and the second electric valve 514 can alternately open and close, respectively flushing the first gas outlet sub-pipe 511 and the second gas outlet sub-pipe 513 alternately, and the alternating opening and closing interval time of the first electric valve 512 and the second electric valve 514 is 15 min. The specific process of step 402 is the same as that in the fifth embodiment above.

[0149] Step 51, the raw gas entering the coke discharging bin 400 and the raw gas generated in the internally heated vertical furnace 300 both enter the chemical product recovery device 600.

[0150] Step 52: The chemical product recovery device 600 purifies and separates the raw coal gas to obtain tar and coal gas.

[0151] Step 53: For the coal gas obtained by the chemical product recovery device 600, a part of the coal gas is transported to the internal heat type vertical furnace 300 to be burned as heat source gas, and another part of the coal gas is transported to the combustion device of the external heat type rotary furnace 500 to be burned as heat source gas.

[0152] Step 60: The semi-coke produced by pyrolysis in the internal heat type vertical furnace 300 enters the coke discharging bin 400, and the semi-coke in the coke discharging bin 400 all enters the waste heat boiler 700 to be cooled to below 300 °C.

[0153] Step 70: The cooled semi-coke enters the hot semi-coke conveying device 800, is transported to the semi-coke cooling device 900, and is discharged after being cooled to below 80 °C.

[0154] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0155] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0156] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0157] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0158] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0159] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A coal pyrolysis system, characterized in that, it includes: a raw coal screening device (100), a pulverized coal drying device (200), an internally heated vertical furnace (300), a coke discharging bin (400), an externally heated rotary furnace (500), and a chemical product recovery device (600); For the raw coal screening device (100), the lump coal discharging port is connected to the upper end of the internally heated vertical furnace (300), and the pulverized coal discharging port is connected to the pulverized coal drying device (200); The pulverized coal drying device (200) is connected to the externally heated rotary furnace (500); The coke discharging bin (400) is located on one side of the internally heated vertical furnace (300) and is communicated with the lower part of the internally heated vertical furnace (300); A plurality of furnace walls (410) are arranged in the coke discharging bin (400), and a coke discharging port (420) is arranged on the coke discharging bin (400); One end of the gas outlet pipe (510) of the externally heated rotary furnace (500) is connected to the coke discharging bin (400); The gas outlet pipe (510), one end is located above the furnace wall (410), and is used for transporting the raw gas generated in the externally heated rotary furnace (500) and all or part of the semi-coke after pyrolysis; The gas outlet pipe (510) of the externally heated rotary furnace (500) transports all or part of the semi-coke after pyrolysis in the externally heated rotary furnace (500) and the raw gas generated in the externally heated rotary furnace (500) to the coke discharging bin 400 of the internally heated vertical furnace (300); The lump coal and semi-coke in the internally heated vertical furnace (300) move, taking away the pulverized coal in the incoming raw gas for dust removal; The raw gas and semi-coke in the externally heated rotary furnace (500) pass through the gas outlet pipe (510) at the same time, and the semi-coke flushes the gas outlet pipe (510); The chemical product recovery device (600) is connected to the gas outlet of the internally heated vertical furnace (300), and is used for purifying and separating the raw gas generated in the internally heated vertical furnace (300) and the raw gas entering the internally heated vertical furnace (300) from the externally heated rotary furnace (500) to obtain tar and gas, and the gas is used as the heat source gas for the internally heated vertical furnace (300) and the externally heated rotary furnace (500).

2. The coal pyrolysis system according to claim 1, characterized in that, the externally heated rotary furnace (500) includes: a gas outlet box (520), a feed chute (530), a rotary furnace chamber (540), and the gas outlet pipe (510); The gas outlet box (520) is connected to the discharge end of the rotary furnace chamber (540) and is connected to the other end of the gas outlet pipe (510); One end of the feed chute (530) is connected to the pulverized coal drying device (200), and the other end is connected to the feed end of the rotary furnace chamber (540).

3. The coal pyrolysis system according to claim 1, characterized in that, The external-heating rotary furnace (500) includes: an air outlet box (520), a feed chute (530), a rotary furnace chamber (540), an internal return device (550), a discharge box (560), and the air outlet pipe (510); The air outlet box (520) is connected to the feed end of the rotary furnace chamber (540) and the other end of the air outlet pipe (510); One end of the feed chute (530) is connected to the pulverized coal drying device (200), and the other end is connected to the feed end of the rotary furnace chamber (540); The discharge end of the rotary furnace chamber (540) is connected to the discharge box (560); The internal return device (550) is arranged in the rotary furnace chamber (540) and extends into the air outlet box (520).

4. A coal pyrolysis system according to claim 3, characterized in that it further includes: a waste heat boiler (700), a hot semi-coke conveying device (800), and a semi-coke cooling device (900); The feed end of the waste heat boiler (700) is connected to the coke discharging port (420); The hot semi-coke conveying device (800) is connected to the discharge end of the waste heat boiler (700); The semi-coke cooling device (900) is connected to the hot semi-coke conveying device (800) and the discharge box (560).

5. A coal pyrolysis system according to claim 2 or 3, characterized in that the air outlet box (520) includes: a first hopper (521); the air outlet pipe (510) includes: a first air outlet sub-pipe (511); The first hopper (521) communicates with the other end of the first air outlet sub-pipe (511); One end of the first air outlet sub-pipe (511) is connected to the coke discharging bin (400); A first electric valve (512) is arranged at a position of the first air outlet sub-pipe (511) close to the first hopper (521).

6. A coal pyrolysis system according to claim 5, characterized in that the air outlet box (520) further includes: a second hopper (522); the air outlet pipe (510) further includes: a second air outlet sub-pipe (513); The second hopper (522) communicates with the other end of the second air outlet sub-pipe (513); One end of the second air outlet sub-pipe (513) is connected to the coke discharging bin (400); A second electric valve (514) is arranged at a position of the second air outlet sub-pipe (513) close to the second hopper (522).

7. A coal pyrolysis method, characterized in that using the coal pyrolysis system according to any one of claims 1 to 6, includes the following steps: Step 10, the blended coal is screened by the raw coal screening device (100) into lump coal with a particle size of 10 mm to 50 mm and pulverized coal with a particle size of less than 10 mm, or screened into lump coal with a particle size of 20 mm to 50 mm and pulverized coal with a particle size of less than 20 mm; the blended coal is raw coal with a particle size of 0 mm to 50 mm; Step 20, the lump coal enters the internal-heating vertical furnace (300) for pyrolysis; Step 30, the pulverized coal enters the pulverized coal drying device (200) for drying, and the dried pulverized coal enters the externally heated rotary furnace (500) for pyrolysis; Step 40, the raw gas generated during the pyrolysis process of the externally heated rotary furnace (500) and all or part of the semicoke after pyrolysis are introduced into the coke discharging bin (400) through the gas outlet pipe (510); Step 51, the raw gas entering the coke discharging bin (400) and the raw gas generated in the internally heated vertical furnace (300) both enter the chemical product recovery device (600); Step 52, the chemical product recovery device (600) purifies and separates the raw gas entering the internally heated vertical furnace (300) and the raw gas generated in the internally heated vertical furnace (300) to obtain tar and gas.

8. A coal pyrolysis method according to claim 7, wherein, in the step 40, when the raw gas and part of the semicoke after pyrolysis enter the coke discharging bin (400) through the gas outlet pipe (510), the step 40 includes: Step 401, the dried pulverized coal enters the rotary furnace bin (540) of the externally heated rotary furnace (500) for pyrolysis. After pyrolysis, part of the semicoke enters the gas outlet box (520) through the internal return device (550), and the other part of the semicoke enters the discharge box (560). The raw gas generated during the pyrolysis process also enters the gas outlet box (520); Step 402, the semicoke and the raw gas in the gas outlet box (520) enter the coke discharging bin (400) through the gas outlet pipe (510).

9. A coal pyrolysis method according to claim 8, wherein, it further includes: Step 53, part of the gas obtained by the chemical product recovery device (600) is transported to the internally heated vertical furnace (300) as the heat source gas for combustion, and the other part of the gas is transported to the combustion device of the externally heated rotary furnace (500) as the heat source gas for combustion; Step 60, the semicoke generated after pyrolysis in the internally heated vertical furnace (300) enters the coke discharging bin (400), and the semicoke in the coke discharging bin (400) all enters the waste heat boiler (700) to be cooled to below 300 °C; Step 70, the cooled semicoke enters the hot semicoke conveying device (800), is transported to the semicoke cooling device (900), and is discharged after being cooled to below 80 °C; the semicoke in the discharge box (560) also enters the semicoke cooling device (900) and is discharged after being cooled to below 80 °C.

10. A coal pyrolysis method according to claim 9, wherein, the specific steps of the step 402 include: alternately opening and closing the first electric valve (512) and the second electric valve (514) to enable the semicoke and the raw gas in the gas outlet box (520) to alternately enter the coke discharging bin (400) through the first gas outlet sub-pipe (511) and the second gas outlet sub-pipe (513).

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