Pyrolysis rotary kiln for low-rank coal

Abstract

A pyrolysis rotary kiln for low-rank coal, the kiln belonging to the field of pyrolysis rotary kilns. The pyrolysis rotary kiln comprises a cylinder device (1), wherein a feeding device (18) and a transmission device (19) are provided at one end of the cylinder device (1), and a discharge device (21) is mounted at the other end of the cylinder device (1); an exhaust device (20) is mounted on the cylinder device (1) close to the feeding device (18), and a combustion chamber (3) is provided on the cylinder device (1) close to the discharge device (21); and the cylinder device (1) consists of a hot-air tube bundle (2), a feeding-end support (4), a discharge-end support (5), a thermally insulating material (6), an inner cylinder (7), an outer cylinder (8) and a slag discharge opening (25), the thermally insulating material (6) being located between the inner cylinder (7) and the outer cylinder (8). The present invention solves the problem of the tight and difficult position arrangement of a central exhaust tube and a coal feeding position in a small pyrolysis kiln, and also solves the problem of, when the pyrolysis kiln is in a hot state, the path of a pyrolysis tube (12) from a discharge end of the inner cylinder (7) to a feeding end thereof and then to the outer cylinder (8), and the corresponding displacements of different parts of a kiln cylinder caused by different temperature rises having different impacts on the structure and sealing performance of the cylinder, etc. The present invention has a rational structure, is easily manufactured, and achieves high-efficiency pyrolysis of low-rank coal.

Description

A low-rank coal pyrolysis rotary kiln Technical Field

[0001] The present invention relates to the field of pyrolysis rotary kilns, and in particular to a low-rank coal pyrolysis rotary kiln. Background Art

[0002] Low-rank coal refers to coal with a low degree of coalification. It is a type of coal. In order to improve the quality of coal and increase the efficiency of coal use, low-rank coal usually needs to be pyrolyzed. Low-rank coal contains more volatile components. Low-temperature rapid pyrolysis can produce high-quality semi-coke and produce tar and coal gas as by-products. When pyrolyzing low-rank coal, a pyrolysis rotary kiln is required. When the pyrolysis rotary kiln is in use, the cylinder used for pyrolysis is installed obliquely on the support structure. The cylinder is driven to rotate by the transmission device. Low-rank coal is input into the cylinder by the feeding device. The pyrolysis of low-rank coal is carried out by heat transfer from the high-temperature pyrolysis tube arranged in the kiln cylinder. The low-rank coal is gradually dried, volatilized and semi-coke pyrolyzed in the cylinder, thereby achieving the purpose of pyrolysis.

[0003] In existing pyrolysis rotary kiln structures, most are relatively small, making the central exhaust pipe and coal feed difficult to arrange, hindering kiln layout and installation, and resulting in limited pyrolysis performance. Furthermore, due to the high pyrolysis temperature within the kiln and the kiln's use of inner drum tyre support, the tyre support area experiences significant thermal deformation, leading to significant heat loss during pyrolysis. Furthermore, significant thermal deformation at the inner drum tyre affects transmission stability, resulting in unstable drum rotation and impacting the normal pyrolysis of low-rank coals.

[0004] Summary of the Invention

[0005] The main purpose of the present invention is to provide a low-rank coal pyrolysis rotary kiln, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A low-rank coal pyrolysis rotary kiln includes a cylinder device, one end of the cylinder device is provided with a feeding device and a transmission device, and the other end of the cylinder device is installed with a discharging device, an exhaust device is installed on the cylinder device near the feeding device, and a combustion chamber is provided on the cylinder device near the discharging device, the cylinder device is composed of a hot gas pipe bundle, a feeding end support, a discharging end support, a thermal insulation material, an inner cylinder, an outer cylinder and a slag discharge port, the thermal insulation material is located between the inner cylinder and the outer cylinder, the feeding end support and the discharging end support are connected to the outer cylinder, and the hot gas pipe bundle is installed in the pyrolysis cylinder composed of the thermal insulation material, the inner cylinder and the outer cylinder.

[0008] Preferably, the cylinder device is installed on the first support device and the second support device, and the first support device is a support device with a baffle. A follower wheel is installed at one end of the cylinder device close to the feeding device, and the slag discharge port is located at a position in the cylinder device close to the discharging device.

[0009] Preferably, the hot gas tube bundle is distributed in a circular array in the pyrolysis cylinder, the feed end support fixes the inner cylinder and the outer cylinder, the discharge end support is fixed to the outer cylinder, and the discharge end support and the inner cylinder are slidably matched and can be axially extended and retracted, and the end of the hot gas tube bundle is connected to the exhaust device.

[0010] Preferably, the hot gas pipe bundle consists of a main air duct, a branch air duct, an air collecting chamber, a pyrolysis tube, an air outlet pipe, an elbow, a tube support plate, a pipe sleeve and a ring sealing plate. The main air duct and the branch air duct are arranged at one end of the cylinder device close to the combustion chamber, the air collecting chamber is connected to the branch air duct, the pyrolysis tube is located in the inner cylinder, and one end of the pyrolysis tube is connected to the air collecting chamber, and the other end is connected to the air outlet pipe through an elbow.

[0011] Preferably, a tube support plate is installed on the pyrolysis tube, the gas outlet pipe passes through the pyrolysis cylinder, and the end of the gas outlet pipe is connected to a pipe sleeve, and a ring sealing plate is installed between the pipe sleeve and the outer cylinder.

[0012] Preferably, the feed end support is composed of a feed end sleeve and a feed end support plate, and the feed end support fixedly connects the inner cylinder and the outer cylinder. The discharge end support is composed of a discharge end sleeve, a discharge end support plate and a guide key, and the discharge end support is fixedly connected to the outer cylinder, and can be axially extended and retracted by sliding with the inner cylinder. The feed end support plate and the discharge end support plate are inclined.

[0013] Preferably, the tube holes on the feed end support plate and the pyrolysis tube, the ring sealing plate and the outer cylinder are all clearance-fitted, and the outer cylinder is provided with a strip hole for moving the pipe sleeve, the pipe sleeve and the ring sealing plate are welded together, and the air outlet pipe and the pipe sleeve are clearance-fitted.

[0014] Preferably, the feeding device includes a first fixed seat, a driving motor, a coupling, a conveying pipe and a feeding hopper, the driving motor is installed on the first fixed seat, the conveying pipe is fixed to the first fixed seat through a bracket, and a conveying mechanism is provided inside the conveying pipe, a coupling is provided between the conveying mechanism and the first fixed seat, the feeding hopper is fixed on the conveying pipe, and the end of the conveying pipe is connected to the cylinder device.

[0015] Preferably, the transmission device includes a second fixed seat, a transmission motor, a reducer and a driving wheel, the reducer is fixed on the second fixed seat, the transmission motor is fixedly connected to the reducer, and the reducer is provided with a transmission shaft, the driving wheel is connected to the end of the transmission shaft, and the driving wheel is meshed with the follower wheel at the end of the cylinder device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the low-rank coal pyrolysis rotary kiln, 1. overcomes the problem of tight and difficult arrangement of the central exhaust pipe and coal feed position in a small pyrolysis kiln, solves the problem of the pyrolysis pipe moving from the discharge end of the inner cylinder to the feed end and then to the outer cylinder when the pyrolysis kiln is hot, and solves the influence of the corresponding displacement of different parts of the kiln cylinder due to different temperature rises on the cylinder structure and sealing, etc., has a reasonable structure and is easy to manufacture, thereby achieving high efficiency in the pyrolysis of low-rank coal;

[0017] 2. The hot gas pipe bundle is welded to the gas collecting cavity at the air inlet end and the discharge end of the inner cylinder. After welding, the hot gas pipe bundle as a whole will expand and contract as the inner cylinder is heated when hot (the support at the air inlet end securely connects the inner and outer cylinders, while the support at the discharge end is fixed to the outer cylinder and slides with the inner cylinder to allow axial expansion and contraction). This allows the inner cylinder, pyrolysis tube, outer cylinder, and annular seal plate to expand and contract axially due to temperature differences. The pipe casing is welded to the annular seal plate, and the exhaust pipe and pipe casing are gap-matched to allow the inner cylinder, exhaust pipe, and outer cylinder to expand and contract radially due to temperature differences.

[0018] 3. A support is provided between the inner cylinder and the outer cylinder. The feed end support is fixedly connected to the inner and outer cylinders by the feed end sleeve and the feed end support plate. The discharge end support is fixed to the outer cylinder by the discharge end sleeve, guide key and discharge end support plate. The discharge end support and the inner cylinder are slidably matched and can freely expand and contract axially with different temperatures. Both supports use inclined support plates to effectively solve the radial thermal expansion caused by the temperature difference between the inner and outer cylinders, thereby ensuring transmission stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a low-rank coal pyrolysis rotary kiln according to an embodiment of the present invention;

[0020] FIG2 is a schematic structural diagram of a cylinder device according to an embodiment of the present invention;

[0021] FIG3 is an enlarged view of point A in FIG2 according to an embodiment of the present invention;

[0022] FIG4 is an enlarged view of point B in FIG2 according to an embodiment of the present invention;

[0023] FIG5 is a schematic structural diagram of a feed end support according to an embodiment of the present invention;

[0024] FIG6 is a schematic structural diagram of the discharge end support according to an embodiment of the present invention;

[0025] FIG7 is a schematic structural diagram of a feeding device according to an embodiment of the present invention;

[0026] FIG8 is a schematic structural diagram of a transmission device in an embodiment of the present invention.

[0027] In the figure: 1. Cylinder assembly; 2. Hot gas tube bundle; 3. Combustion chamber; 4. Feed end support; 5. Discharge end support; 6. Insulation material; 7. Inner cylinder; 8. Outer cylinder; 9. Main air duct; 10. Branch air duct; 11. Gas collecting chamber; 12. Pyrolysis tube; 13. Discharge pipe; 14. Elbow; 15. Tube support plate; 16. Pipe casing; 17. Ring seal plate; 18. Feeding assembly; 1801. First fixing seat; 1802. Drive motor; 1803. Coupling; 1804, conveying pipe; 1805, feed hopper; 19, transmission device; 1901, second fixed seat; 1902, transmission motor; 1903, reducer; 1904, driving wheel; 20, exhaust device; 21, discharging device; 22, first supporting device; 23, second supporting device; 24, follower wheel; 25, slag discharge port; 26, feed end sleeve; 27, feed end support plate; 28, discharge end sleeve; 29, discharge end support plate; 30, guide key. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] As shown in Figures 1 to 8, a low-rank coal pyrolysis rotary kiln includes a cylinder device 1, a feeding device 18 and a transmission device 19 are provided at one end of the cylinder device 1, and a discharging device 21 is installed at the other end of the cylinder device 1, an exhaust device 20 is installed at a position near the feeding device 18 on the cylinder device 1, and a combustion chamber 3 is provided at a position near the discharging device 21 on the cylinder device 1. The cylinder device 1 is composed of a hot gas pipe bundle 2, a feeding end support 4, a discharging end support 5, a thermal insulation material 6, an inner cylinder 7, an outer cylinder 8 and a slag discharge port 25. The thermal insulation material 6 is located between the inner cylinder 7 and the outer cylinder 8, the feeding end support 4 and the discharging end support 5 are connected to the outer cylinder 8, the hot gas pipe bundle 2 is installed in the pyrolysis cylinder composed of the thermal insulation material 6, the inner cylinder 7 and the outer cylinder 8, and the cylinder device 1 is installed on a first support device 22 and a second support device 23. The first supporting device 22 is a supporting device with a baffle, and a follower wheel 24 is installed at one end of the cylinder device 1 close to the feeding device 18. The slag discharge port 25 is located in the cylinder device 1 at a position close to the discharging device 21. The hot gas tube bundle 2 is distributed in a circular array in the pyrolysis cylinder. The feeding end support 4 fixes the inner cylinder 7 and the outer cylinder 8, and the discharging end support 5 is fixed to the outer cylinder 8, and the discharging end support 5 and the inner cylinder 7 slide together and can be axially retracted. The end of the hot gas tube bundle 2 is connected to the exhaust device 20, which overcomes the problem of tight arrangement of the central exhaust pipe and the coal feeding position 18 of the small pyrolysis kiln, solves the path of the pyrolysis tube 12 from the discharging end of the inner cylinder 7 to the feeding end and then to the outer cylinder 8 when the pyrolysis kiln is hot, and solves the influence of the corresponding displacement of different parts of the kiln cylinder due to different temperature rise on the cylinder structure and sealing. The structure is reasonable and the production is convenient, which realizes the high efficiency of low-rank coal pyrolysis.

[0030] When assembling the pyrolysis rotary kiln, the cylinder device 1 consisting of the hot gas tube bundle 2, the feed end support 4, the discharge end support 5, the insulation material 6, the inner cylinder 7, the outer cylinder 8 and the slag discharge port 25 is firmly installed under the action of the first support device 22 and the second support device 23, wherein the first support device 22 is a belt support device. After the cylinder device 1 is installed, the combustion chamber 3 is set at the end position of the cylinder device 1 to ensure that the combustion chamber 3 is connected to the hot gas tube bundle 2. The feeding device 18 and the transmission device 19 are set at the other end of the cylinder device 1. The feeding device 1 8 is connected to the cylinder device 1, and the transmission device 19 is connected to the follower wheel 24 at the end of the cylinder device 1. The exhaust device 20 is installed on the cylinder device 1 near the feeding device 18, so that the exhaust device 20 is connected to the hot gas pipe bundle 2, thereby completing the assembly and setting of the entire pyrolysis rotary kiln. After the pyrolysis rotary kiln is assembled, the pyrolysis work of low-rank coal begins. During pyrolysis, the transmission device 19 drives the cylinder device 1 to rotate on the first supporting device 22 and the second supporting device 23, and the low-rank coal is input into the cylinder device 1 through the feeding device 18. At the same time, the combustion The corresponding fuel is burned inside the combustion chamber 3 to generate heat, and the hot gas moves through the hot gas tube bundle 2 in the pyrolysis cylinder composed of the insulation material 6, the inner cylinder 7 and the outer cylinder 8. The temperature inside the pyrolysis cylinder rises, thereby drying, volatilizing and semi-coking the low-rank coal. The pyrolyzed low-rank coal is discharged into the discharge device 21 through the slag discharge port 25 and finally discharged through the discharge device 21, thus realizing the pyrolysis of the low-rank coal. During the operation of the pyrolysis rotary kiln, the first support device 22 and the second support device 23 are connected to the outer cylinder 8, and cooperate with The use of the heat-insulating material 6 can not only reduce the temperature loss inside the rotary kiln, but also ensure that the portion where the outer cylinder 8 is connected to the first supporting device 22 and the second supporting device 23 is operated in a relatively low temperature environment when the rotary kiln rotates, thereby avoiding deformation of the connection portion, ensuring operational stability, and improving the pyrolysis effect. At the same time, the feed end support 4 fixes the inner cylinder 7 and the outer cylinder 8, and the discharge end support 5 is fixed to the outer cylinder 8 and slides with the inner cylinder 7 to be axially retractable, thereby avoiding the situation where the rotary kiln cannot be used normally due to different deformation amounts under different heating conditions.

[0031] As shown in Figures 2, 3 and 4, the hot gas tube bundle 2 is composed of a main air duct 9, a branch air duct 10, a gas collecting cavity 11, a pyrolysis tube 12, an outlet pipe 13, an elbow 14, a tube support plate 15, a pipe sleeve 16 and a ring sealing plate 17. The main air duct 9 and the branch air duct 10 are arranged at one end of the cylinder device 1 close to the combustion chamber 3, the gas collecting cavity 11 is connected to the branch air duct 10, the pyrolysis tube 12 is located in the inner cylinder 7, and one end of the pyrolysis tube 12 is connected to the gas collecting cavity 11, and the other end is connected to the outlet pipe 13 through the elbow 14. A tube support plate 15 is installed on the pyrolysis tube 12, and the outlet The gas pipe 13 runs through the pyrolysis cylinder, and the end of the gas outlet pipe 13 is connected to the pipe sleeve 16. A ring sealing plate 17 is installed between the pipe sleeve 16 and the outer cylinder 8. The hot gas pipe bundle 2 adopts the gas collection cavity 11 at the air inlet end to be welded to the discharge end of the inner cylinder 7. After welding, the hot gas pipe bundle 2 as a whole extends as the inner cylinder 7 is heated when in the hot state, ensuring adaptability for use. The hot gas pipe bundle 2 is distributed in an annular array inside the cylinder device 1, which can ensure the heating effect on the inside of the inner cylinder 7 and ensure uniform heating, so that the cylinder device 1 has the same pyrolysis effect on low-rank coal when rotating.

[0032] When the hot gas tube bundle 2 is used to pyrolyze the low-rank coal inside the cylinder device 1, the heat generated in the combustion chamber 3 causes the gas to heat up, and the high-temperature gas enters the branch air pipe 10 through the main air pipe 9. The branch air pipe 10 transmits the high-temperature gas to the gas collecting cavity 11. The gas collecting cavity 11 distributes the high-temperature gas to each pyrolysis tube 12, and the pyrolysis tube 12 transmits the temperature to the cylinder device 1. Under the action of the high-temperature gas inside the pyrolysis tube 12, the temperature inside the cylinder device 1 is increased to pyrolyze the low-rank coal. As the gas moves, when it moves to the end of the pyrolysis tube 12, it enters the outlet pipe 13 through the elbow 14, and then is output from the end of the outlet pipe 13, and finally discharged from the exhaust device 20. During the use of the entire hot gas tube bundle 2, the tube support plate 15 can ensure the stability of the pyrolysis tube 12. The welded pipe sleeve 16 and the ring sealing plate 17 can not only ensure the relative stability of the outlet pipe 13, but also ensure the sealing of the connection between the outlet pipe 13 and the outer cylinder 8.

[0033] As shown in Figures 5 and 6, the feed end support 4 is composed of a feed end sleeve 26 and a feed end support plate 27, and the feed end support 4 fixes the inner cylinder 7 and the outer cylinder 8 together, and the discharge end support 5 is composed of a discharge end sleeve 28, a discharge end support plate 29 and a guide key 30, and the discharge end support 5 is fixedly connected to the outer cylinder 8, and is axially retractable in a sliding fit with the inner cylinder 7. The feed end support plate 27 and the discharge end support plate 29 are tilted, and the pipe hole on the feed end support plate 27 is clearance-fitted with the pyrolysis tube 12, the ring sealing plate 17 and the outer cylinder 8, and the outer cylinder 8 is provided with a sleeve 1 for the pipe. 6 movable strip hole, the pipe sleeve 16 and the ring sealing plate 17 are welded together, the outlet pipe 13 and the pipe sleeve 16 are clearance-matched, the pipe hole on the feed end support plate 27 and the pyrolysis tube 12, the ring sealing plate 17 and the outer cylinder 8 are all clearance-matched, the outer cylinder 8 is processed with the pipe sleeve 16 axially movable strip hole to meet the axial elongation and movement of the inner cylinder 7, pyrolysis tube 12, outer cylinder 8, and the ring sealing plate 17 due to different temperature differences, the pipe sleeve 16 and the ring sealing plate 17 are welded, the outlet pipe 13 and the pipe sleeve 16 are clearance-matched, to meet the radial elongation and movement of the inner cylinder 7, the outlet pipe 13, and the outer cylinder 8 due to different temperature differences.

[0034] The feed end sleeve 26 and the feed end support plate 27 in the feed end support 4 fixedly connect the inner cylinder 7 and the outer cylinder 8. The discharge end sleeve 28, the discharge end support plate 29 and the guide key 30 in the discharge end support 5 are fixedly connected to the outer cylinder 8, and are slidably connected to the inner cylinder 7. When the pyrolysis cylinder is used, the inner cylinder 7 and the outer cylinder 8 are subjected to different amounts of heat, and the inner cylinder 7 undergoes a greater deformation, while the outer cylinder 8 does not deform due to the heat insulation effect of the thermal insulation material 6. At this time, since the feed end support 4 and the discharge end support 5 are fixedly connected to the outer cylinder 8, the normal rotation of the pyrolysis cylinder is guaranteed, and the deformation of the inner cylinder 7 slides relative to the discharge end support 5, and can expand and contract in the axial direction without affecting the normal deformation of the inner cylinder 7, thereby ensuring the use effect.

[0035] As shown in Figure 7, the feeding device 18 includes a first fixed seat 1801, a driving motor 1802, a coupling 1803, a conveying pipe 1804 and a feeding hopper 1805. The driving motor 1802 is installed on the first fixed seat 1801. The conveying pipe 1804 is fixed to the first fixed seat 1801 through a bracket, and a conveying mechanism is provided inside the conveying pipe 1804. A coupling 1803 is provided between the conveying mechanism and the first fixed seat 1801. The feeding hopper 1805 is fixed on the conveying pipe 1804, and the end of the conveying pipe 1804 is connected to the cylinder device 1. The feeding device 18 can realize continuous feeding, and when used in conjunction with the discharging device 21, it can realize continuous low-rank coal pyrolysis.

[0036] When using the feeding device, the driving motor 1802 is installed on the first fixed seat 1801, and the conveying pipe 1804 is fixed on the first fixed seat 1801 through a bracket. The end of the conveying pipe 1804 is connected to the cylinder device 1. At the same time, a conveying mechanism is provided inside the conveying pipe 1804, and a coupling 1803 is connected between the axis of the conveying mechanism and the axis of the driving motor 1802. After the driving motor 1802 is powered on, the conveying mechanism inside the conveying pipe 1804 is driven by the coupling 1803 to run, and low-rank coal is added to the feed hopper 1805. The low-rank coal falls into the conveying pipe 1804 through the feed hopper 1805. Under the action of the conveying mechanism inside the conveying pipe 1804, the low-rank coal moves along the conveying pipe 1804 toward the cylinder device 1, and finally enters the cylinder device 1 for pyrolysis.

[0037] As shown in Figure 8, the transmission device 19 includes a second fixed seat 1901, a transmission motor 1902, a reducer 1903 and a driving wheel 1904. The reducer 1903 is fixed on the second fixed seat 1901, the transmission motor 1902 is fixedly connected to the reducer 1903, and the reducer 1903 is provided with a transmission shaft. The driving wheel 1904 is connected to the end of the transmission shaft, and the driving wheel 1904 is meshed with the follower wheel 24 at the end of the cylinder device 1. The driving wheel 1904 is used to directly drive the follower wheel 24, which can ensure the transmission effect and reduce the intermediate loss. The reducer 1903 ensures that the output speed will not be too fast, thereby ensuring the slow rotation of the cylinder device 1 and ensuring the thermal decomposition effect of low-rank coal.

[0038] When setting up the transmission device 19, the reducer 1903 is installed on the second fixed seat 1901, and the transmission motor 1902 is fixedly installed on the reducer 1903. At the same time, a driving wheel 1904 is connected to the end of the transmission shaft of the reducer 1903. The driving wheel 1904 is meshed and connected with the follower wheel 24 at the end of the cylinder device 1. When the rotary kiln is used to pyrolyze low-rank coal, after the power of the transmission motor 1902 is turned on, the transmission motor 1902 runs, and under the drive of the transmission motor 1902, the reducer 190 3 rotates. During this process, due to the deceleration effect of the reducer 1903, the rotation speed of the drive shaft will not be too fast. When the drive shaft rotates, the driving wheel 1904 at the end of the drive shaft drives the follower wheel 24 to rotate slowly, thereby causing the cylinder device 1 to rotate. The cylinder device 1 rotates on the first supporting device 22 and the second supporting device 23, and is used in conjunction with the combustion chamber 3, the feeding device 18, the discharging device 21 and other structures at the end of the cylinder device 1 to realize the rotary pyrolysis of low-rank coal.

[0039] The above content describes the operating principles, features, and beneficial effects of the present invention. Persons skilled in the art will appreciate that the above content does not limit the present invention. The above embodiments and description describe the basic principles and features of the present invention. Various modifications and improvements may be made to the present invention while remaining consistent with the concept of the present invention. These modifications should fall within the scope of protection claimed by the present invention.

Claims

1. A low-rank coal pyrolysis rotary kiln, comprising a cylinder device (1), one end of the cylinder device (1) is provided with a feeding device (18) and a transmission device (19), and the other end of the cylinder device (1) is provided with a discharging device (21), an exhaust device (20) is installed at a position close to the feeding device (18) on the cylinder device (1), and a combustion chamber (3) is provided at a position close to the discharging device (21) on the cylinder device (1), characterized in that: The cylinder device (1) is composed of a hot gas pipe bundle (2), a feed end support (4), a discharge end support (5), a heat-insulating material (6), an inner cylinder (7), an outer cylinder (8), and a slag discharge port (25); the heat-insulating material (6) is located between the inner cylinder (7) and the outer cylinder (8); the feed end support (4) and the discharge end support (5) are connected to the outer cylinder (8); and the hot gas pipe bundle (2) is installed in a pyrolysis cylinder composed of the heat-insulating material (6), the inner cylinder (7), and the outer cylinder (8).

2. A low-rank coal pyrolysis rotary kiln according to claim 1, characterized in that: The barrel device (1) is mounted on a first supporting device (22) and a second supporting device (23), and the first supporting device (22) is a supporting device with a stopper. A follower wheel (24) is mounted on one end of the barrel device (1) close to the feeding device (18), and the slag discharge port (25) is located in the barrel device (1) at a position close to the discharging device (21).

3. A low-rank coal pyrolysis rotary kiln according to claim 2, characterized in that: The hot gas pipe bundle (2) is distributed in a circular array in the pyrolysis cylinder, the feed end support (4) fixedly connects the inner cylinder (7) and the outer cylinder (8), the discharge end support (5) is fixed to the outer cylinder (8), and the discharge end support (5) and the inner cylinder (7) are slidably matched and can be axially retracted, and the end of the hot gas pipe bundle (2) is connected to the exhaust device (20).

4. A low-rank coal pyrolysis rotary kiln according to claim 3, characterized in that: The hot gas pipe bundle (2) is composed of a main air duct (9), a branch air duct (10), an air collecting chamber (11), a pyrolysis tube (12), an air outlet pipe (13), an elbow (14), a tube support plate (15), a pipe sleeve (16) and a ring sealing plate (17). The main air duct (9) and the branch air duct (10) are arranged at one end of the cylinder device (1) close to the combustion chamber (3), the air collecting chamber (11) is connected to the branch air duct (10), and the pyrolysis tube (12) is located in the inner cylinder (7), and one end of the pyrolysis tube (12) is connected to the air collecting chamber (11), and the other end is connected to the air outlet pipe (13) through the elbow (14).

5. A low-rank coal pyrolysis rotary kiln according to claim 4, characterized in that: A tube support plate (15) is installed on the pyrolysis tube (12), the gas outlet pipe (13) penetrates the pyrolysis cylinder, and the end of the gas outlet pipe (13) is connected to a pipeline sleeve (16), and a ring sealing plate (17) is installed between the pipeline sleeve (16) and the outer cylinder (8).

6. A low-rank coal pyrolysis rotary kiln according to claim 5, characterized in that: The feed end support (4) is composed of a feed end sleeve (26) and a feed end support plate (27), and the feed end support (4) fixedly connects the inner cylinder (7) and the outer cylinder (8). The discharge end support (5) is composed of a discharge end sleeve (28), a discharge end support plate (29) and a guide key (30), and the discharge end support (5) is fixedly connected to the outer cylinder (8), and is slidably matched with the inner cylinder (7) to be axially retractable. The feed end support plate (27) and the discharge end support plate (29) are arranged obliquely.

7. A low-rank coal pyrolysis rotary kiln according to claim 6, characterized in that: The tube holes on the feed end support plate (27) and the pyrolysis tube (12), the ring sealing plate (17) and the outer cylinder (8) are all clearance-matched, and the outer cylinder (8) is provided with a strip hole for the movement of the pipeline sleeve (16), the pipeline sleeve (16) and the ring sealing plate (17) are welded together, and the gas outlet pipe (13) and the pipeline sleeve (16) are clearance-matched.

8. A low-rank coal pyrolysis rotary kiln according to claim 7, characterized in that: The feeding device (18) comprises a first fixed seat (1801), a driving motor (1802), a coupling (1803), a conveying pipe (1804) and a feeding hopper (1805), wherein the driving motor (1802) is mounted on the first fixed seat (1801), the conveying pipe (1804) is fixed to the first fixed seat (1801) by a bracket, and a conveying mechanism is provided inside the conveying pipe (1804), a coupling (1803) is provided between the conveying mechanism and the first fixed seat (1801), the feeding hopper (1805) is fixed on the conveying pipe (1804), and the end of the conveying pipe (1804) is connected to the barrel device (1).

9. A low-rank coal pyrolysis rotary kiln according to claim 8, characterized in that: The transmission device (19) comprises a second fixed seat (1901), a transmission motor (1902), a reducer (1903) and a driving wheel (1904); the reducer (1903) is fixed on the second fixed seat (1901); the transmission motor (1902) is fixedly connected to the reducer (1903); a transmission shaft is provided on the reducer (1903); the driving wheel (1904) is connected to the end of the transmission shaft; and the driving wheel (1904) is meshedly connected to a follower wheel (24) at the end of the cylinder device (1).

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