The invention relates to the technical field of improvement of the permeability of downhole low-permeability coal seams of coal mines, and discloses a system for improving the permeability of coal bymeans of periodic hammering by the aid of high-pressure air pulses and water waves. The system is characterized in that cracking equipment comprises a high-pressure gas release pipe, a hole sealing capsule and a high-pressure double-layer delivery pipe, the high-pressure double-layer delivery pipe comprises an inner-layer high-pressure double-layer gas delivery inner pipe and an outer-layer high-pressure double-layer water delivery outer pipe, the high-pressure double-layer gas delivery inner pipe is connected with the high-pressure gas release pipe, a plurality of unidirectional gas release holes are formed in the high-pressure gas release pipe, and the hole sealing capsule is arranged on the outer wall of the high-pressure double-layer delivery pipe and is close to the high-pressure gasrelease pipe; a water filling device is communicated with the high-pressure double-layer water delivery outer pipe and can deliver water into cracking holes; an inflating device is communicates with the hole sealing capsule and the high-pressure double-layer gas delivery inner pipe, and can deliver gas into the hole sealing capsule or the cracking holes in a switching manner, and the hole sealingcapsule can be radially expanded to seal holes after being inflated. The invention further provides a method for improving the permeability of the coal by means of periodic hammering by the aid of thehigh-pressure air pulses and the water waves. The method is used with the system for improving the permeability of the coal.

System and method for improving permeability of coal by means of periodic hammering by aid of high-pressure air pulses and water waves

The invention relates to a preparation method of a stopping agent for preventing coal spontaneous combustion, and belongs to the technical field of coal miens. Magnesium chloride, limechloride, stannic chloride, hypophosphite and sodium persulfate are adopted and mixed to be used as the stopping agent. The surface of the stopping agent is covered with amanium, and the stopping agent with good heatresisting stability and for preventing coal spontaneous combustion is prepared. The magnesium chloride, limechloride, sodium chloride have a good resistance effect in the early stage of coal spontaneous combustion. The C=O in the coal molecular structure is easier to react with the stopping agent, -CH2, -CH3 in fatty hydrocarbon are combined with root ions of the stopping agent, and therefore thefatty hydrocarbon is reduced, CO and olefin gas release is reduced, the resistance effect in the later stage of coal oxidation spontaneous combustion is better. The sodium persulfate reacts with theactive group in coal in advance, transition groups such as ether, methyl, carboxylic acid and the like which are stable at low temperature are generated, and coal spontaneous combustion is effectivelyprevented.

Preparation method of stopping agent for preventing coal spontaneous combustion

The invention provides a reagent with both a coal seam spontaneous combustion resistance function and a gas drainage and anti-reflection function and a construction method. The reagent with both the coal seam spontaneous combustion resistance function and the gas drainage and anti-reflection function is composed of a component A and a component B, wherein the volume ratio of of the component A tothe component B is 1:1, the component A consists of hydrochloric acid and water, and the component B consists of sodium bicarbonate, sodium persulfate, N-methylpyrrolidone, sodium dodecylbenzenesulfonate and water. The reagent and the construction method have the advantages that the construction method has both the coal seam spontaneous combustion resistance function and the gas drainage and anti-reflection function, the reagent with both the coal seam spontaneous combustion resistance function and the gas drainage and anti-reflection function is applied, the component A and the component B are injected into a closed space of a coal seam separately, the component A is reacted with the component B to achieve a self-pressurization effect, permeation of liquid into coal seam fractures is facilitated, spontaneous combustion of coal is prevented, fractures and pore structures of the coal seam are improved, the permeability of the coal seam is improved, the gas release speed of the coal seamis increased, and favorable conditions for extraction of coal seam gas and safe mining of the coal are created.

Reagent with both coal seam spontaneous combustion resistance function and gas drainage and anti-reflection function and construction method

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Reagent with both coal seam spontaneous combustion resistance function and gas drainage and anti-reflection function and construction method