CN-121611448-B - Mining system and method for mine non-ventilation working face

Abstract

The invention provides a mining system and a mining method for a mine ventilation-free working face, which relate to the technical field of coal mining and comprise an L-shaped working face, a coal mining three-machine, an air door, a low-temperature nitrogen injection system and an exhaust system, wherein the coal mining three-machine is arranged in the L-shaped working face and used for finishing coal wall cutting, roof supporting and coal transportation, the air door is arranged at a position, close to a joint of an auxiliary conveying main roadway, of a transportation gate and used for closing an inlet of the L-shaped working face to form a closed space, the low-temperature nitrogen injection system is arranged in the auxiliary conveying main roadway, an output end of the low-temperature nitrogen injection system passes through the air door and is used for conveying nitrogen subjected to cooling treatment to the L-shaped working face, so that the oxygen concentration in the L-shaped working face is reduced to below 5%, the temperature is maintained at 20-25 ℃ and kept in a positive pressure state, and the exhaust system is arranged in the air return main roadway, and an input end of the exhaust system passes through the air door and is used for discharging gas of the L-shaped working face. Compared with the traditional ventilation system, the system realizes near zero carbon emission in the coal mining process, and can reduce more than 90% of gas emission and more than 95% of dust emission.

Inventors

• DENG CUNBAO
• LV RUI
• ZHAO ZIHAO
• WANG YANSHENG
• ZHANG YU
• WANG XUEFENG
• GUO XIAOYANG
• ZHOU BIN
• WANG XIAOBO
• QIAO LING

Assignees

• 太原理工大学

Dates

Publication Date

20260508

Application Date

20260203

Claims (6)

1. 1. A mine ventilation-free working face recovery system, comprising: The L-shaped working surface is formed by vertically communicating a working surface cutting hole (10) with a transportation cis-slot (11); The coal mining three-machine is arranged in the L-shaped working surface and is used for finishing coal wall cutting, roof supporting and coal transportation, and comprises a coal mining machine (1), a hydraulic support (2) and a scraper conveyor (3); the multi-channel air door (7) is arranged at a position of the transportation gateway (11) close to the joint of the auxiliary transportation gateway (13) and is used for closing the inlet of the L-shaped working surface so as to form a closed space; The low-temperature nitrogen injection system (8) is arranged in the auxiliary transportation roadway (13), the output end of the low-temperature nitrogen injection system (8) penetrates through the air door (7) and is used for conveying nitrogen subjected to cooling treatment to the L-shaped working surface, so that the oxygen concentration in the L-shaped working surface is reduced to below 5%, the temperature is maintained at 20-25 ℃, and the positive pressure state is maintained; The exhaust system (9) is arranged in the air return main roadway (15), and the input end of the exhaust system (9) passes through the air door (7) and is used for exhausting the gas of the L-shaped working surface; The system comprises two L-shaped directional long drilling holes (32) and a main conveying roadway (13), wherein the two L-shaped directional long drilling holes are used for collecting gas in a coal bed and inhibiting gas accumulation in an L-shaped working surface, the inlet end of one L-shaped directional long drilling hole (32) is communicated with the ground surface, and the inlet end of the other L-shaped directional long drilling hole (32) is communicated with the main conveying roadway (13); The coal conveying device comprises a transfer conveyor (4), a gate belt conveyor (5), a coal chute (6), a belt mountain-climbing roadway (12), a mountain-climbing belt conveyor (18), a coal bin (20) and a coal feeder (22), wherein the transfer conveyor (4) and the gate belt conveyor (5) are arranged in the transportation gate (11), the transfer conveyor (4) is used for transferring coal conveyed by the scraper conveyor (3) to the gate belt conveyor (5), one end of the belt mountain-climbing roadway (12) is arranged below the transportation gate (11) and is communicated with the transportation gate (11) through the coal chute (6), the coal bin (20) is arranged between the coal chute (6) and the transportation gate (11) and is communicated with the coal chute (6), the other end of the belt mountain-climbing roadway (12) is used for being communicated with a main conveyor (14), the coal feeder (22) is arranged below the conveyor (6) and is used for carrying coal discharged from the belt mountain-climbing roadway (12) to the coal conveyor (18).
2. 2. A mine ventilation-free working face extraction system according to claim 1, characterized in that the shearer (1) is provided with a shearer drum (30), the shearer drum (30) being configured to perform a super cut at the tail end of the scraper conveyor (3) to form a super cut zone (31) at the coal wall, the super cut zone (31) having a length greater than the radius of the shearer drum (30).
3. 3. A mine ventilation-free working face extraction system according to claim 2, characterized in that the number of the hydraulic supports (2) is plural, the hydraulic supports are sequentially arranged along the transportation direction of the scraper conveyor (3), wherein at least one hydraulic support (2) near the tail end of the scraper conveyor (3) is provided with a coal cleaning mechanical bucket (28) for cleaning a gangue mixture (29) located in front of the scraper conveyor (3) after the coal mining machine (1) leaves the tail end of the scraper conveyor (3) so as to smoothly push the scraper conveyor (3).
4. 4. The mine ventilation-free working face extraction system of claim 1, further comprising a plurality of monitoring units (21) for monitoring ambient temperature, ambient air pressure, a plurality of harmful gas concentrations and dust concentrations, wherein the monitoring units (21) are disposed in at least one of the transportation gate (11), the belt climbing roadway (12), the damper (7) and the working face cutting (10).
5. 5. The mine ventilation-free working face extraction system of claim 1, further comprising a plurality of respirator component replacement bins (25), wherein the respirator component replacement bins (25) are arranged in the L-shaped working face, and a calcium hydroxide cleaning portable tank (26) and an oxygen portable tank (27) are arranged in the respirator component replacement bins (25).
6. 6. A mine non-ventilated work surface extraction method, characterized in that it is implemented based on the mine non-ventilated work surface extraction system according to any one of claims 1 to 5, the method comprising: installing underground equipment under a roadway ventilation condition; Closing the air door (7) to realize the sealing of the L-shaped working surface; Starting a low-temperature nitrogen injection system (8) and an exhaust system (9) to form a positive-pressure anaerobic working environment in the L-shaped working surface; and carrying out coal stoping operation.

Description

Mining system and method for mine non-ventilation working face Technical Field The invention relates to the technical field of coal mining, in particular to a mining system and a mining method for a mine non-ventilation working face. Background In the field of coal mine underground mining, ventilation systems are always core technical supports for guaranteeing mining operation safety. Since the application of mechanical ventilation technology in the 18 th century, coal mining gradually realizes large-scale mining from shallow to deep, and modern longwall coal mining methods have developed mature process systems represented by U-shaped ventilation systems. The system forms a complete ventilation loop through arranging an air inlet roadway and an air return roadway, provides fresh air flow for a working surface in a mechanical ventilation mode, discharges harmful substances such as gas, dust and the like, and controls the temperature and the humidity. In a specific implementation level, the existing ventilation mining technology mainly adopts a long-wall fully-mechanized mining technical scheme, and typical configuration of the ventilation mining technology comprises a coal mining machine, a scraper conveyor, a hydraulic support and matched ventilation facilities. The working face usually adopts a roadway arrangement mode of 'one-in-one-turn' or 'two-in-two-turn', and the safety of the working environment is maintained through a ventilation system. In order to prevent harmful gas in the goaf from penetrating into the working area, a roadway protection coal pillar with the width of 20-30 m is required to be reserved or roadside filling is required to be carried out. Although the traditional ventilation mining technology plays an important role in coal mine safety production, the traditional ventilation mining technology has various remarkable defects, and the economy and safety of coal mine mining are severely restricted. Firstly, the construction cost of the ventilation system is high, a plurality of roadways are required to be arranged to meet ventilation requirements, the tunneling cost of each 2000m roadway is up to 3200 ten thousand yuan, and the ventilation equipment and maintenance cost are added, so that the ventilation cost of ton coal is up to 50-90 yuan, the ventilation cost accounts for 20-25% of the total mining cost, and the market competitiveness of coal products is greatly weakened. Secondly, the number of the roadway protection coal pillars is increased due to the multiple roadways which are arranged for meeting ventilation requirements, so that a large amount of coal resources are lost, the lost coal resources of a single working face can reach 42 ten thousand tons, and the direct economic loss exceeds 2 hundred million yuan. Third, environmental pollution problem is outstanding, and the gas of 90% above in the existing ventilation system is directly discharged into the atmosphere through ventilation air, and annual emission exceeds 1870 ten thousand tons, and its greenhouse effect is equivalent to hundreds of hundred million tons of carbon dioxide, and the annual emission of dust that produces in the coal mining process is about 760 ten thousand tons simultaneously, causes serious pollution to mining area and surrounding environment. Fourth, the potential safety hazard is not eliminated, the death number of the 'one-ventilation three-prevention' accident is about one third of the total accident of the coal mine, and the reliability problem existing in the ventilation system is difficult to completely stop the phenomena of gas accumulation and coal spontaneous combustion in the mine with complex geological conditions. Fifthly, the development of technical equipment is limited, the explosion-proof requirement causes that the equipment is heavy in weight, high in energy consumption and low in intelligent degree, and many ground mature technologies cannot be directly applied to underground, so that the intelligent development process of a coal mine is severely restricted. Sixth, the adaptability of the system is poor, the adaptability of the existing ventilation exploitation system to geological condition changes is insufficient, the ventilation exploitation system is difficult to effectively play a role under complex geological conditions such as no coal pillar, high gas and the like, and the innovation space of the exploitation process is limited. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to a certain extent. Therefore, the invention aims to provide a mining system and a mining method for a mine non-ventilation working face, which can prevent gas and dust emission and realize near-zero carbon emission in the coal mining process. To achieve the above object, a first aspect of the present invention provides a mining system for a mine ventilation-free working face, comprising: The L-shaped working surface is formed by ver