Upright internal heating type semi-coke furnace and coal briquette pyrolysis purification system

Abstract

The utility model relates to a vertical internal heating type semi-coke furnace and coal briquette pyrolysis system.The vertical internal heating type semi-coke furnace comprises a furnace top coal box, an auxiliary coal box, furnace walls and a carbonization chamber, the furnace walls enclose to form a cavity, a plurality of spaced wall bodies are arranged on the lower portion of the cavity, the upper portion of the cavity is communicated with the auxiliary coal box, the carbonization chamber is composed of gaps between the adjacent wall bodies, and the upper portion of the carbonization chamber is communicated with the auxiliary coal box. A gas mixing chamber is embedded in the upper end part of the wall body, the gas mixing chamber is used for spraying mixed gas into the carbonization chamber, a combustion nozzle for conveying the mixed gas is connected to the gas mixing chamber, and a coke quenching large groove for receiving and quenching semi-coke from the carbonization chamber is formed in the lower end of the furnace wall; and a hydraulic coke pusher for pushing semi-coke into the large quenching tank is arranged at the lower end of the carbonization chamber. According to the internal heating type semi-coke furnace, mixed gas is jetted into the carbonization chamber through the gas mixing chamber to heat and pyrolyze coal briquettes, the carbonization quality of semi-coke is improved, meanwhile, the gas yield is improved by 40%, and the calorific value of gas reaches 2000 kilocalories.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal block pyrolysis, and in particular relates to an upright internal heating type blue charcoal furnace and a coal block pyrolysis purification system. Background Art

[0002] Traditional internally heated semi-coal furnaces primarily heat coal lumps with a mixture of gas and air to produce semi-coal. However, this method uses 40% of the gas for reheating, leaving the remaining 60% for other uses, such as power generation. Furthermore, the gas has a low calorific value of only 1700-1800 kcal.

[0003] Furthermore, in Fugu, Shaanxi, due to the large number of magnesium kilns, companies have opted for small, air-only round furnaces to produce semi-coke and supply coal gas. However, existing small round furnaces have limited production capacity, with a maximum single furnace capacity of only 30,000 tons, and they lack the ability to be large-scale, intelligent, environmentally friendly, and energy-efficient. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an upright internal heating type blue charcoal furnace and a coal block pyrolysis purification system. The gas mixing chamber of the internal heating type blue charcoal furnace of the present invention is composed of chrome corundum bricks. The mixed gas is sprayed from the gas mixing chamber into the carbonization chamber to heat and pyrolyze the coal blocks in the carbonization chamber, which not only improves the quality of the blue charcoal, but also increases the gas production.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An upright internal heating type blue charcoal furnace, comprising:

[0007] Coal box on the top of the furnace, for coal blocks to enter;

[0008] an auxiliary coal box connected to the lower end of the furnace top coal box;

[0009] A furnace wall is provided at the lower end of the auxiliary coal box and is used to support the auxiliary coal box and the furnace top coal box. The furnace wall encloses a cavity. A plurality of spaced walls are provided at the lower part of the cavity. The upper part of the cavity is connected to the auxiliary coal box.

[0010] A carbonization chamber is provided in the furnace wall and is formed by the gaps between adjacent walls, and is used for pyrolysis of coal blocks in the carbonization chamber by mixed gas;

[0011] a gas mixing chamber, embedded in the upper end of the wall and communicated with the carbonization chamber, for injecting the mixed gas into the carbonization chamber;

[0012] A burner nozzle, one end of which passes through the furnace wall and is connected to the gas mixing chamber, for delivering the mixed gas into the gas mixing chamber;

[0013] A large coke quenching tank is provided at the lower end of the furnace wall and is connected therewith, and is used to receive and quench the semi-coke from the carbonization chamber;

[0014] A hydraulic coke pusher is arranged at the lower end of the carbonization chamber and is used to push the blue coke into the coke quenching tank.

[0015] Furthermore, it also includes a main air fan and an exhaust gas fan, one end of the main air fan is connected to the burner nozzle for conveying air to the burner nozzle; one end of the exhaust gas fan is connected to the burner nozzle for conveying flue gas to the burner nozzle, and the flue gas and the air are mixed in the burner nozzle to form the mixed gas.

[0016] Furthermore, it also includes a coke supporting plate, which is arranged at the lower end of the hydraulic coke pusher and communicates with the carbonization chamber, and is used to support the blue coke flowing out from the lower end of the carbonization chamber.

[0017] Furthermore, the fixed end of the hydraulic coke pusher is arranged on the outside of the furnace wall, and the telescopic end of the hydraulic coke pusher extends into the coke supporting plate.

[0018] Furthermore, the burner includes a flue gas U-shaped tube, an air U-shaped tube and several burner nozzles. The flue gas U-shaped tube and the air U-shaped tube are sleeved on the outer periphery of the furnace wall. One end of each burner nozzle is connected with the flue gas U-shaped tube and the air U-shaped tube, and the other end of each burner nozzle passes through the furnace wall and is connected with the corresponding gas mixing chamber.

[0019] Furthermore, the burner includes a straight air pipe and a straight flue gas pipe that are spaced apart from each other. One end of the straight air pipe is connected to the U-shaped air pipe, and one end of the straight flue gas pipe is connected to the U-shaped flue gas pipe.

[0020] Furthermore, the gas mixing chamber is formed by enclosing chrome corundum bricks, and the fire holes of the chrome corundum bricks radially penetrate the carbonization chamber.

[0021] Furthermore, a peephole is provided at one end of the burner.

[0022] The utility model also provides a coal block pyrolysis purification system, including the upright internal heating blue charcoal furnace described in the utility model, and also including a countercurrent spray tower for cooling and washing the furnace top gas, an electric tar collector for separating coal tar, a gas blower for pressurizing the furnace top gas and a rotary trap for dehydrating the furnace top gas, which are connected in series in sequence. The countercurrent spray tower is connected to the auxiliary coal box.

[0023] Furthermore, it also includes a mixing tank, which is connected to the countercurrent spray tower, the electric tar collector, the gas blower and the rotary trap, and is used to collect and separate ammonia water and coal tar.

[0024] The utility model adopts the above technical solution, which has the following advantages and effects:

[0025] (1) The utility model provides an upright internal heating type semi-coke furnace and a coal block pyrolysis purification system. The gas mixing chamber is made of chrome corundum bricks. The mixed gas is sprayed into the carbonization chamber through the fire holes of the chrome corundum bricks to form a high temperature of 1100°C to pyrolyze the coal blocks. This not only improves the quality of the semi-coke, but also increases the gas production by 40% and the calorific value of the gas to about 2000 kcal, effectively improving the utilization value of the gas. The purified gas is suitable for high-demand occasions such as metal magnesium kilns and gas power generation, and can meet large-scale industrial applications.

[0026] (2) The utility model provides an upright internal heating type blue charcoal furnace and coal block pyrolysis purification system, which adopts the air intake method of "blowing only air, not blowing coal gas", uses air as the only heating medium, and controls the temperature by adjusting the mixing ratio of air and flue gas, thereby avoiding burning of the carbonization chamber and reducing energy consumption and environmental pollution; and the gas mixing chamber is enclosed by chrome corundum bricks to form a cavity structure, which can withstand high temperatures, reduce slag and burning, and reduce the maintenance frequency and maintenance cost of the carbonization chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a schematic structural diagram of an upright internal heating type blue charcoal furnace.

[0028] Figure 2 It is a partially enlarged structural schematic diagram of the gas mixing chamber of the utility model.

[0029] Figure 3 It is a schematic diagram of the top view of the connection between the burner and the wall.

[0030] Figure 4 It is a partial enlarged structural diagram of the connection between the burner nozzle and the wall of the utility model.

[0031] Figure 5 The utility model is a schematic structural diagram of a coal block pyrolysis purification system.

[0032] The accompanying drawings are numbered as follows: 1- furnace top coal box, 2- auxiliary coal box, 3- carbonization chamber, 4- gas mixing chamber, 401- chrome corundum brick, 402- wall, 5- burner nozzle, 51- burner nozzle, 52- air U-shaped pipe, 53- flue gas U-shaped pipe, 521- air inlet, 531- flue gas inlet, 511- air straight pipe, 512- flue gas straight pipe, 5121- peephole, 6-Hydraulic coke pusher, 7-Coke quenching tank, 8-Exhaust gas fan, 801-Flue gas pipe, 9-Kiln, 10-Coke support plate, 11-Furnace wall, 1101-Gas pipeline, 12-Belt conveyor, 13-Lancoke shed, 14-Main air fan, 1401-Air pipe, 15-Rotary catcher, 16-Gas fan, 17-Electrostatic tar precipitator, 18-Countercurrent spray tower, 19-Mixing tank. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings to describe the embodiments of the present invention in detail so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0034] like Figure 1-Figure 4 As shown. The utility model provides an upright internal heating type blue charcoal furnace, comprising a furnace top coal box 1, an auxiliary coal box 2, a carbonization chamber 3, a gas mixing chamber 4, a burner 5, a large coke quenching tank 7, a hydraulic coke pusher 6 and a furnace wall 11. The furnace top coal box 1 is used for coal blocks to enter, and the auxiliary coal box 2 is connected to the lower end of the furnace top coal box 1. The furnace wall 11 is arranged at the lower end of the auxiliary coal box 2 to support the auxiliary coal box 2 and the furnace top coal box 1. The furnace wall 11 is enclosed to form a cavity, and a plurality of spaced walls 402 are arranged at the lower part of the cavity, and the upper part of the cavity is connected to the auxiliary coal box 2. The carbonization chamber 3 is arranged in the lower part of the furnace wall 11, and is composed of the gap between adjacent walls 402. The carbonization chamber 3 is used to heat and pyrolyze the coal blocks entering from the furnace top coal box 1 to form blue charcoal. The gas mixing chamber 4 is embedded in the upper end of the wall 402 and is connected to the carbonization chamber 3. The gas mixing chamber 4 is used to transport mixed gas to the carbonization chamber 3. One end of the burner 5 passes through the furnace wall 11 and is connected to the gas mixing chamber 4. The quenching tank 7 is arranged at the lower end of the furnace wall 11 and is connected thereto. The quenching tank 7 is used to receive and quench the semi-coke from the carbonization chamber 3. The hydraulic coke pusher 6 is arranged at the lower end of the carbonization chamber 3 and is used to slowly push the carbonized semi-coke into the quenching tank 7.

[0035] Specifically, the furnace top coal box 1 is a double-conical box, and the upper end of the auxiliary coal box 2 is a frustum-shaped structure, communicating with the lower end of the furnace top coal box 1. The furnace wall 11 is a square cavity structure, with its upper end supported by and connected to the lower end of the auxiliary coal box 2. The large coke quenching tank 7 is located at the lower end of the furnace wall 11 and connects to it.

[0036] The carbonization chamber 3 is located in the lower portion of the inner cavity of the furnace wall 11. The gap between the walls 402 forms the carbonization chamber 3 for accommodating coal. The upper inner cavity of the furnace wall 11 is a hollow cavity, which is connected to the auxiliary coal box 2. After the coal enters the carbonization chamber 3 through the hollow cavity, it is pyrolyzed by the mixed gas to form blue char. The large coke quenching tank 7 is located at the lower end of the furnace wall 11 and is connected to the lower end of the wall 402. A burner 5 is provided at both ends of each wall 402. One end of the burner 5 penetrates the furnace wall 11 and then connects to the gas mixing chamber 4 on the wall 402. A pair of burners 5 penetrate the two ends of the gas mixing chamber 4. The other end of each burner 5 is connected to the gas pipeline, which transports flue gas and air. The flue gas and air enter the gas mixing chamber 4 through the burner 5 to form a mixed gas, which enters the carbonization chamber 3 through the fire hole on the gas mixing chamber 4, so that the coal blocks in the carbonization chamber 3 are accelerated to be pyrolyzed. The coal blocks at the bottom of the carbonization chamber 3 are continuously heated and slowly move vertically downward to be pyrolyzed into blue coke, which is slowly pushed into the coke quenching tank 7 through the coke pusher 6.

[0037] The gas mixing chamber 4, located at the upper end of the carbonization chamber 3, is designed to withstand the high temperature of the mixed gas. After passing through the gas mixing chamber 4, the mixed gas enters the upper end of the carbonization chamber 3, where it forms a high temperature region, which is where the high-temperature pyrolysis of the coal occurs. A belt conveyor 12 is installed on top of the top coal box 1. This conveyor 12 transports screened, qualified coal into the top coal box 1, keeping it full. The coal then passes through the auxiliary coal box 2 and enters the carbonization chamber 3 for pyrolysis.

[0038] A gas outlet is provided at the upper end of the furnace wall 11 , and a gas pipeline 1101 is connected to the gas outlet. The gas generated after the pyrolysis of the coal blocks is output through the gas pipeline 1101 for further utilization.

[0039] Furthermore, an upright internal heating type blue charcoal furnace of the present invention also includes a main air fan 14 and an exhaust gas fan 8. One end of the main air fan 14 is connected to the burner 5 for supplying air to the burner 5; one end of the exhaust gas fan 8 is connected to the burner 5 for supplying flue gas to the burner 5. The flue gas is mixed with air to form a mixed gas.

[0040] Specifically, one end of the exhaust gas fan 8 is connected to the burner 5 through the flue gas pipe 801. The exhaust gas fan 8 extracts the flue gas after combustion in the kiln 9 and sends it into the burner 5 through the flue gas pipe 801. The main air fan 14 is connected to the burner 5 through the air pipe 1401. After the main air fan 14 extracts the air, it sends the air into the burner 5 through the air pipe 1401 to mix with the flue gas.

[0041] Furthermore, an upright internal heating type semi-coke furnace of the present invention also includes a coke supporting plate 10, which is arranged at the lower end of the hydraulic coke pusher 6 and is connected to the carbonization chamber 3. The coke supporting plate 10 is used to support the semi-coke flowing out from the lower end of the carbonization chamber 3.

[0042] Specifically, the coke supporting plate 10 is a flat plate structure, the upper end of the coke supporting plate 10 is connected to the carbonization chamber 3, the lower end of the carbonization chamber 3 passes through the coke supporting plate 10, and the semi-coke at the bottom of the carbonization chamber 3 falls into the coke supporting plate 10. The coke pusher 6 can slowly push the semi-coke in the coke supporting plate 10 into the coke quenching tank 7.

[0043] Furthermore, the fixed end of the hydraulic coke pusher 6 is set on the outside of the furnace wall 11, and the telescopic end of the hydraulic coke pusher 6 extends into the coke supporting plate 10. The hydraulic coke pusher 6 is an electro-hydraulic telescopic mechanism. The fixed end is fixed to the side wall of the furnace wall 11, and the telescopic end is extended to the coke supporting plate 10 at the lower end of the carbonization chamber 3 of the furnace wall 11. The telescopic end is provided with a push plate, which is used to slowly push the semi-coke into the large coke quenching tank 7 by telescoping the push plate.

[0044] Furthermore, the burner 5 includes a flue gas U-shaped tube 53, an air U-shaped tube 52 and a plurality of burner nozzles 51. The flue gas U-shaped tube 53 and the air U-shaped tube 52 are sleeved on the outer periphery of the furnace wall 11. One end of each burner nozzle 51 is connected to the flue gas U-shaped tube 53 and the air U-shaped tube 52, and the other end of each burner nozzle 51 passes through the furnace wall 11 and is connected to the corresponding gas mixing chamber 4.

[0045] Specifically, the flue gas U-shaped tube 53 and the air U-shaped tube 52 form a U-shaped cavity tube structure. The inner diameter of the air U-shaped tube 52 is smaller than that of the flue gas U-shaped tube 53, and the flue gas U-shaped tube 53 is sleeved on the outer circumference of the air U-shaped tube 52. Multiple burners 51 penetrate the furnace wall 11 at multiple points and enter the gas mixing chamber 4. One end of each burner 51 is connected to the gas mixing chamber 4, and the other end of each burner 51 is connected to both the flue gas U-shaped tube 53 and the air U-shaped tube 52 for conveying flue gas and air. After mixing in the burner 51, the air and flue gas enter the gas mixing chamber 4 and are ejected into the carbonization chamber 3.

[0046] Furthermore, the burner 51 includes a linear air tube 511 and a linear flue gas tube 512, which are interspaced and interlocked. One end of the linear air tube 511 is connected to the U-shaped air tube 52, and one end of the linear flue gas tube 512 is connected to the U-shaped flue gas tube 53. The linear flue gas tube 512 and the linear air tube 511 are interlocked to form the burner 51. One end of the linear flue gas tube 512 extends beyond the linear air tube 511, and a peephole 5121 is provided at the end of the extended linear flue gas tube 512.

[0047] Furthermore, a peephole 5121 is provided at the outer end of the burner 51 for observing the slag accumulation in the gas mixing chamber 4. If the slag accumulation in the gas mixing chamber 4 is severe, maintenance can be performed. In the present invention, the peephole 5121 is a transparent window located at the outer end of the flue gas straight pipe 512.

[0048] Furthermore, the flue gas U-shaped tube 53 is connected to the exhaust fan 8, and the air U-shaped tube 52 is connected to the main air fan 14. The flue gas U-shaped tube 53 is provided with a flue gas inlet 531, and the air U-shaped tube 52 is provided with an air inlet 521. The flue gas inlet 531 is connected to the exhaust fan 8 through the flue gas pipe 801, and the air inlet 521 is connected to the main air fan 14 through the air pipe 1401.

[0049] Furthermore, in order to control the temperature in the lignite furnace from being too high, the exhaust gas fan 8 draws the flue gas after combustion to the burner 5 and mixes it with the air extracted by the main air fan 14, and by adjusting the mixing ratio of air and flue gas, the temperature of the carbonization chamber 3 can be controlled within 1100°C, which will not cause the gas mixing chamber 4 to be burned by high temperature, and there is enough air volume to increase the lignite production and the amount of coal gas.

[0050] Furthermore, in order to facilitate the transportation of the semi-coke, a semi-coke belt conveyor is provided at one end of the large quenching tank 7, and the quenched semi-coke is transported to the semi-coke field shed 13 via the semi-coke belt conveyor.

[0051] Furthermore, a number of walls 402 are spaced apart within the furnace wall 11. A gas mixing chamber 4 is embedded within the upper end of the wall 402. The gas mixing chamber 4 is formed by chrome corundum bricks 401, forming a cavity structure and located at the upper end of the wall 402. The fire holes of the chrome corundum bricks 401 radially penetrate the inside and outside of the gas mixing chamber 4, and the gas mixing chamber 4 and the carbonization chamber 3 are interconnected through the fire holes. The wall 402 is built on a steel platform with a coke support plate 10 at the lower end of the steel platform. The mixed gas enters the carbonization chamber 3 through the fire holes of the chrome corundum bricks 401, pyrolyzing the coal blocks to form blue coke. The blue coke then falls down the wall 402 onto the coke support plate 10 and is pushed by the hydraulic coke pusher 6 into the large coke quenching tank 7 for quenching.

[0052] Furthermore, the chrome corundum brick 401 is made of chrome corundum. Chrome corundum brick 401 is not only resistant to high temperatures but also not prone to slagging, which reduces maintenance frequency and costs, allowing the semi-coal furnace to operate continuously for more than four years.

[0053] Specifically, the mixed gas enters the coal block area at the upper end of the carbonization chamber 3 through the fire holes of the chrome corundum bricks 401 to pyrolyze the coal blocks. This area is about 1 meter high and the temperature is about 1100°C. The high-temperature gas diffuses upward and preheats the coal blocks in the upper part of the carbonization chamber 3. The chrome corundum bricks 401 can withstand the high temperature without being burned.

[0054] The utility model provides an upright internal heating type blue charcoal furnace. When in use, the coal blocks in the furnace are initially ignited to raise the temperature in the furnace. Then, the main air blower 14 is used to blow air into the carbonization chamber to assist combustion and heat the furnace. When the temperature in the carbonization chamber reaches about 1100°C, the exhaust gas blower 8 is used to blow flue gas into the furnace and mix it with air to keep the temperature in the furnace at about 1100°C to pyrolyze the coal blocks. The coal gas generated from the furnace top can be used as external coal gas after purification.

[0055] like Figure 5 The present invention also provides a coal pyrolysis purification system, comprising the upright internally heated blue charcoal furnace of the present invention, and further comprising a countercurrent spray tower 18 for cooling and washing the top gas, an electric tar collector 17 for separating coal tar, a gas blower 16 for pressurizing the top gas, and a rotary trap 15 for dehydrating the top gas, which are connected in series. The countercurrent spray tower 18 is connected to the auxiliary coal box 2 via a gas pipeline 1101.

[0056] Specifically, the top gas is connected from the auxiliary coal box 2 to the lower part of the countercurrent spray tower 18 through the gas pipeline 1101. After the gas is cooled and washed in the countercurrent spray tower 18, it enters the electric precipitator 17 from the top of the countercurrent spray tower 18 through a pipeline to recover coal tar. The upper part of the electric precipitator 17 is connected to the inlet of the gas blower 16 through a pipeline. The previous section is a negative pressure section. The top gas entering the gas blower 16 is pressurized and then enters the rotary trap 15. It is dehydrated and purified by the rotary trap 15 and then transported to the power plant or metal magnesium kiln.

[0057] Furthermore, the coal block pyrolysis purification system of the present invention also includes a mixing tank 19, which is connected to the countercurrent spray tower 18, the electric tar collector 17, the gas blower 16 and the rotary trap 15. The mixing tank 19 is used to collect and statically separate ammonia water and coal tar.

[0058] Specifically, as the top gas passes through countercurrent spray tower 18, the lower portion of the tower collects some ammonia and coal tar. As the top gas passes through electrostatic precipitator 17, the lower portion of the precipitator collects some coal tar. As the top gas passes through gas blower 16, the lower portion of the blower collects some ammonia and coal tar. The collected ammonia and coal tar then enter mixing tank 19 for a static separation, where the oil and water are allowed to stand before separating into the ammonia and coal tar. The separation of ammonia and coal tar is achieved by the difference in specific gravity: the specific gravity of ammonia is 1, while the specific gravity of coal tar is 1.04-1.06. After static stratification, the lower layer contains coal tar.

[0059] When in use, the coal pyrolysis purification system of the present invention first uses the main air blower 14 to deliver air to the vertical internal heating type blue charcoal furnace to heat the coal. Then, the exhaust gas blower 8 extracts the flue gas after combustion and mixes it with air to form a mixed gas. The ratio of air and flue gas in the mixed gas is adjusted to control the temperature in the carbonization chamber 3 within 1100°C. Finally, the produced blue charcoal falls from the bottom of the carbonization chamber 3 onto the coke support plate 10, and is then slowly pushed into the coke quenching tank 7 by the coke pusher 6 for quenching. At the same time, the generated furnace top gas is purified by the countercurrent spray tower 18, the electric tar precipitator 17, and the rotary trap 15, and can then be transported to a power plant or a metal magnesium kiln for utilization.

Claims

1. A vertical internal heating type blue charcoal furnace, characterized in that: include: A coal box (1) on the top of the furnace, for coal blocks to enter; An auxiliary coal box (2) connected to the lower end of the furnace top coal box (1); A furnace wall (11) is provided at the lower end of the auxiliary coal box (2) for supporting the auxiliary coal box (2) and the furnace top coal box (1), wherein the furnace wall (11) encloses a cavity, a plurality of spaced walls (402) are provided at the lower portion of the cavity, and an upper portion of the cavity is in communication with the auxiliary coal box (2); The carbonization chamber (3) is arranged in the furnace wall (11) and is formed by the gaps between adjacent walls (402) and is used for pyrolyzing the coal in the carbonization chamber (3) with the mixed gas; a gas mixing chamber (4), embedded in the upper end of the wall (402) and connected to the carbonization chamber (3), for injecting the mixed gas into the carbonization chamber (3); A burner (5), one end of which passes through the furnace wall (11) and is connected to the gas mixing chamber (4), for conveying the mixed gas into the gas mixing chamber (4); A large coke quenching tank (7) is provided at the lower end of the furnace wall (11) and is in communication therewith, and is used for receiving and quenching the semi-coke from the carbonization chamber (3); A hydraulic coke pusher (6) is provided at the lower end of the carbonization chamber (3) and is used to push the blue coke into the large coke quenching tank (7).

2. The vertical internal heating type blue charcoal furnace according to claim 1, characterized in that: The invention also includes a main air blower (14) and an exhaust gas blower (8). One end of the main air blower (14) is connected to the burner (5) for conveying air to the burner (5); one end of the exhaust gas blower (8) is connected to the burner (5) for conveying flue gas to the burner (5). The flue gas and the air are mixed in the burner (5) to form the mixed gas.

3. The vertical internal heating type blue charcoal furnace according to claim 1 or 2, characterized in that: It also includes a coke supporting plate (10), which is arranged at the lower end of the hydraulic coke pusher (6) and communicates with the carbonization chamber (3) and is used to support the blue coke flowing out from the lower end of the carbonization chamber (3).

4. The vertical internal heating type blue charcoal furnace according to claim 3, characterized in that: The fixed end of the hydraulic coke pusher (6) is arranged on the outside of the furnace wall (11), and the telescopic end of the hydraulic coke pusher (6) extends into the coke supporting plate (10).

5. The vertical internal heating type blue charcoal furnace according to claim 4, characterized in that: The burner (5) comprises a flue gas U-shaped tube (53), an air U-shaped tube (52) and a plurality of burner nozzles (51). The flue gas U-shaped tube (53) and the air U-shaped tube (52) are sleeved on the outer periphery of the furnace wall (11). One end of each burner nozzle (51) is connected to the flue gas U-shaped tube (53) and the air U-shaped tube (52). The other end of each burner nozzle (51) passes through the furnace wall (11) and is connected to the corresponding gas mixing chamber (4).

6. The vertical internal heating type blue charcoal furnace according to claim 5, characterized in that: The burner (51) comprises a straight air pipe (511) and a straight flue gas pipe (512) which are interspaced and annular with each other. One end of the straight air pipe (511) is connected to the air U-shaped pipe (52), and one end of the straight flue gas pipe (512) is connected to the flue gas U-shaped pipe (53).

7. The vertical internal heating type blue charcoal furnace according to claim 6, characterized in that: The gas mixing chamber (4) is formed by enclosing chrome corundum bricks (401), and the fire holes of the chrome corundum bricks (401) radially penetrate the carbonization chamber (3).

8. The vertical internal heating type blue charcoal furnace according to claim 5, characterized in that: A peephole (5121) is provided at one end of the burner nozzle (51).

9. A coal pyrolysis purification system, characterized by: It comprises an upright internally heated semi-coke furnace as described in any one of claims 1 to 8, and also comprises a countercurrent spray tower (18) for cooling and washing furnace top gas, an electric tar collector (17) for separating coal tar, a gas blower (16) for pressurizing furnace top gas, and a rotary trap (15) for dehydrating furnace top gas, which are connected in series in sequence, and the countercurrent spray tower (18) is connected to the auxiliary coal box (2).

10. The coal pyrolysis purification system according to claim 9, characterized in that: The invention also comprises a mixing tank (19), wherein the mixing tank (19) is connected to the countercurrent spray tower (18), the electric tar collector (17), the gas blower (16) and the rotary trap (15), and is used for collecting and separating ammonia water and coal tar.

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