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A coal mining method and gas technology, which are applied in ground mining, mining equipment, earthwork drilling, etc., can solve the problems of destroying the ecological environment, climate warming, low utilization rate, etc. Destruction, the effect of prolonging the service life
Active Publication Date: 2011-05-18
CHINA UNIV OF MINING & TECH
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[0003] my country's coal seam gas reserves reach 35 trillion m 3 However, the utilization rate has been very low, and most of the gas is directly discharged into the atmosphere because the concentration is too low; gas is a greenhouse gas, and direct discharge into the atmosphere will lead to climate warming and damage the ecological environment
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Embodiment 1
[0022] Embodiment one, figure 1 image 3 As shown in Fig. 4, Fig. 5 and Fig. 6, when there is no outburst danger in the coal seam through outburst hazard identification, the steps of coal seam gas co-mining coal mining method are as follows:
[0023] a, first excavate the uphill roadway 5, after the excavation is completed, excavate two transport roadways 9 from the uphill roadway 5 to both sides of the mining face 15;
[0024] b. Excavate the air-conditioning roadway 8 near and parallel to the uphill roadway 5, and then excavate the section return air level roadway 14 and the section transportation level roadway 7 on both sides of the air-conditioning roadway 8, and finally excavate the working face cut eye 12, complete Overall roadway excavation works;
[0025] C, install the air-conditioning system 11 that is made of ventilator 16, air-conditioner 18 and dust removal equipment 17 inside air-conditioning roadway 8;
[0026] d. Install two airtight doors 1 that can pass mi...
Embodiment 2
[0033] Embodiment two, figure 2 image 3 As shown in Fig. 5 and Fig. 6, when the coal seam is identified as outburst risk by the outburst risk, the steps of the coal gas co-mining coal mining method for the outburst dangerous coal seam are as follows:
[0034] a. After the tunneling of the uphill roadway 5 and the return airway 6 is completed, two transport roadways 9 are excavated from the uphill roadway 5 to both sides of the mining face 15 respectively; Two arc-shaped pressure-relieving tunnels 10 connected to the section return air tunnel 14 and the section transportation tunnel 7 respectively to reduce wind flow resistance;
[0035] b. Excavate the air-conditioning roadway 8 near and parallel to the uphill roadway 5, and then excavate the section return air level roadway 14 and the section transportation level roadway 7 on both sides of the air-conditioning roadway 8, and finally excavate the working face cut eye 12, complete Overall roadway excavation project; under t...
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Abstract
The invention relates to a coal mining method for co-mining gas in a mine. A method for injecting nitrogen in a sealed manner is adopted to close an upper drift and a lower drift of a stope face to ensure that the concentration of gas in a closed space is over 20%, the concentration of oxygen is lower than 12%, so that the explosive hazard of the gas is eliminated, and high-concentration gas in a roadway is drained so as to be utilized. A safety pressure-relief roadway needs to be remained in the mine with dangers of coal and gas outburst, and is used for releasing high-pressure gas generated by coal and gas outburst, and improving disaster resistant capability of the mine. An air regulating system is arranged in the closed space for regulating air, and a worker operates in the closed space under the condition that the safety protection is well done. Due to adoption of the method, the problem of gas explosion is solved fundamentally, the utilization ratio of gas is improved, fire disasters of the coal mine are eliminated fundamentally, the oxidation corrosion of various metal equipments is reduced, and simultaneously the equipment does not have anti-explosion requirements. As workers breathe air carried per se, the occurrence of respiratory occupational diseases is avoided. Therefore, the coal mining method for co-mining gas has extremely large popularization value.
Description
technical field [0001] The invention relates to a mine gas co-extraction method, in particular to a mining face suitable for underground coal mines with high gas, no large faults and good sealing conditions. Background technique [0002] In the process of mining high-gas coal seams, it is easy to cause gas to exceed the limit during work; to carry out mining operations in outburst dangerous coal seams, it is easy to cause coal and gas outburst, and once the gushing gas or a large amount of outburst gas reaches the explosion limit, it may cause an explosion , will bring serious damage to the mine, causing mass death and mass injury vicious accidents. At present, the mass death and mass injury accidents in China are basically gas explosion accidents. Although the traditional gas explosion prevention and control technology can play a certain role in prevention and control, due to the continuous gas gushing out and the occurrence of coal and gas outburst accidents, the gas conc...
Claims
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