CN-122014157-A - Underground coal gasification ash layer stripping device

CN122014157ACN 122014157 ACN122014157 ACN 122014157ACN-122014157-A

Abstract

The invention discloses an underground coal gasification ash layer stripping device, which relates to the technical field of underground coal gasification ash layer stripping. The device drives the gun barrel to rotate through the ground control transmission unit, the spray head can rotate in the horizontal plane, and the circumferential cleaning blind area of the channel ash layer is eliminated. Meanwhile, the pushing component can control the expansion and contraction of the spray head, so that the spray head can adapt to channels with different diameters and keep the optimal spraying distance, and the device can flexibly fit with irregular channels. The spiral guide vane in each jet pipe converts the high-pressure direct flow into high-speed rotational flow to generate strong shearing stress, thereby realizing efficient crushing and stripping of dense ash layers with strong adhesive force.

Inventors

ZHOU KE
MAO CHENG
ZENG GUISEN
Mou Yousong
SU LI
ZHANG SHIHAI
WU CHAO
SHEN CHUNHE
LUO XIAOPENG
Yang Anqian
WU SONG
CHEN YUZHONG

Assignees

贵州创星电力科学研究院有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. An underground coal gasification ash layer stripping device is characterized by comprising, The driving unit (1) comprises a driving piece (11) and an output shaft (12) in transmission connection with the driving piece (11); The execution unit (2) is arranged on one side of the output shaft (12) and comprises a fixed disc (21), a gun barrel (22) connected with the axis of the fixed disc (21), a propulsion component (23) fixed on the inner side of the gun barrel (22) and a stripping component (24) arranged at the front end of the propulsion component (23); the transmission unit (3) is arranged between the driving unit (1) and the execution unit (2) and is used for transmitting the rotary motion of the output shaft (12) to the gun barrel (22) so as to drive the gun barrel (22) and the stripping assembly (24) to rotate around the axis of the gun barrel (22); A detection unit (4) for detecting the rotation angle of the barrel (22) or the stripping assembly (24).
2. The underground coal gasification ash layer stripping apparatus of claim 1, wherein: The transmission unit (3) comprises a first direction output piece (31) and a second direction output piece (32) which are meshed with each other, and a box body (33) for accommodating the first direction output piece (31) and the second direction output piece (32); The first direction output piece (31) is fixed at the tail end of the output shaft (12), and the second direction output piece (32) is fixedly sleeved at the shaft end of the fixed disc (21).
3. The underground coal gasification ash layer stripping apparatus according to claim 1 or 2, characterized in that: one end of the gun barrel (22) close to the fixed disc (21) is provided with a first independent channel (221) and a second independent channel (222) in a penetrating way; wherein the first channel (221) communicates with the propulsion assembly (23) for providing a driving medium to the propulsion assembly (23); The second passage (222) communicates with an interior cavity (223) formed inside the barrel (22) for delivering a stripping working medium to the stripping assembly (24).
4. The underground coal gasification ash layer stripping apparatus of claim 3, wherein: The stripping assembly (24) comprises an air blowing pipe (241) fixedly connected with the propulsion assembly (23), and an air blowing piece (242) connected to the end part of the air blowing pipe (241).
5. The underground coal gasification ash bed stripping apparatus as set forth in claim 4, wherein: The blowing pipe (241) comprises a straight pipe section (2411) and a curved pipe section (2412) connected to the straight pipe section (2411).
6. The underground coal gasification ash bed stripping apparatus of claim 5, wherein: the straight pipe section (2411) is close to an inlet hole (51) at one side of the propulsion component (23), and a sealing sheet (52) fixedly sleeved on the outer side of the straight pipe section (2411).
7. The underground coal gasification ash bed stripping apparatus of claim 6, wherein: the propulsion assembly (23) comprises a cylinder (231) in communication with the first channel (221), and a piston rod (232) connected to the cylinder (231).
8. The underground coal gasification ash bed stripping apparatus of claim 5, wherein: The blowing part (242) comprises a connecting pipe (2421) connected with the blowing pipe (241), and a spray head (2422) connected with the connecting pipe (2421).
9. The underground coal gasification ash bed stripping apparatus of claim 8, wherein: The spray head (2422) is a split-flow spray head, and a split-flow cavity (61) and a plurality of spray pipes (62) communicated with the split-flow cavity (61) are arranged in the spray head; At least one of the spray pipes (62) is internally provided with a spiral guide vane (63).
10. The underground coal gasification ash layer stripping apparatus of claim 1, wherein: the detection unit (4) comprises an angle sensor (41) connected to one side of the axis of the output shaft (12).

Description

Underground coal gasification ash layer stripping device Technical Field The invention relates to an underground coal gasification ash layer stripping technology, in particular to an underground coal gasification ash layer stripping device. Background In the underground coal gasification process, coal combustion and gasification generate a large amount of coal ash, and the coal ash is easy to adhere to the inner wall of a gasification channel to form an ash layer. With the continuous increase of the ash layer thickness, the efficiency of the gasification reaction is reduced, the yield of the gas is reduced, and the gasification channel is blocked when serious, so that the gasification process is interrupted. Therefore, periodic, efficient ash layer cleaning of the gasification tunnel inner walls is required. The conventional cleaning means at present adopts a high-pressure gas injection device, and is generally composed of a high-pressure gas source, a conveying pipeline and a nozzle, however, the technology has the obvious defects that the first injection direction is fixed, the geometry of the underground gasification channel is complex and a plurality of parts are bent when the technology is practically applied to the underground gasification channel, so that a large amount of dead zones and dead angles are necessarily left in the conventional injection mode, and the cleaning effect is poor. Secondly, the traditional direct current spraying mode has very limited stripping capability on a dense ash layer with extremely strong adhesive force, and most of kinetic energy of the high-speed air flow is extremely easy to diffuse after impacting the wall surface, so that most of kinetic energy of the high-speed air flow cannot be effectively transmitted to a sediment bottom layer, the utilization rate of impact energy is extremely low, and acceptable cleaning effects can be obtained by repeated flushing for many times. Disclosure of Invention Therefore, the invention aims at solving the technical problems that the traditional direct current injection mode has limited stripping capability on a dense ash layer with strong adhesive force, the impact energy utilization rate is low, repeated flushing is needed, and time and energy are consumed. The technical problem is solved by the following technical scheme that the invention provides an underground coal gasification ash layer stripping device, which comprises a driving unit and a stripping unit, wherein the driving unit comprises a driving piece and an output shaft in transmission connection with the driving piece; the execution unit is arranged on one side of the output shaft and comprises a fixed disc, a gun barrel connected with the axis of the fixed disc, a propulsion assembly fixed on the inner side of the gun barrel and a stripping assembly arranged at the front end of the propulsion assembly; The transmission unit is arranged between the driving unit and the execution unit and is used for transmitting the rotation motion of the output shaft to the gun barrel so as to drive the gun barrel and the stripping assembly to rotate around the axis of the gun barrel; And the detection unit is used for detecting the rotation angle of the gun barrel or the stripping assembly. In a preferred embodiment of the underground coal gasification ash layer stripping device, the transmission unit comprises a first direction output piece and a second direction output piece which are meshed with each other, and a box body for accommodating the first direction output piece and the second direction output piece; the first direction output piece is fixed at the tail end of the output shaft, and the second direction output piece is fixedly sleeved at the shaft end of the fixed disc. In a preferred embodiment of the underground coal gasification ash layer stripping device, one end of the gun barrel, which is close to the fixed disc, is provided with a first independent channel and a second independent channel in a penetrating way; Wherein the first channel communicates with the propulsion assembly for providing a driving medium to the propulsion assembly; the second channel is communicated with an inner cavity formed on the inner side of the gun barrel and is used for conveying stripping working medium to the stripping assembly. In a preferred embodiment of the underground coal gasification ash layer stripping device, the stripping assembly comprises an air blowing pipe fixedly connected with the propulsion assembly and an air blowing piece connected with the end part of the air blowing pipe. In a preferred embodiment of the underground coal gasification ash layer stripping device, the air blowing pipe comprises a straight pipe section and a bent pipe section connected with the straight pipe section. In a preferred embodiment of the underground coal gasification ash layer stripping device, the straight pipe section is close to an inlet hole at one side of the propulsion assembly, and