Passive extrusion type pulse coal chip jet flow coal breaking pressure relief anti-reflection device and use method thereof

Abstract

The invention discloses a passive extrusion type pulse coal chip jet flow coal breaking pressure relief anti-reflection device and a use method thereof. The device mainly comprises an anchor stirrer,a water tank, a slurry pump, a pressure gauge, a pipeline, a rotary water tail, a drilling machine, a drill rod, an integrated drill bit, a dust collection cover, a dust collection pipeline, a coal chip box, a filter screen and a jet pump. According to the device, coal chips generated during drilling is used as an abrasive material, the slurry pump is used for pressurizing to form a passive extrusion type pulse high-pressure coal chip jet flow, the passive extrusion type pulse high-pressure coal chip jet flow passes through a nozzle of the integrated drill bit to be accelerated again, coal iseroded and broken, coal seam pressure relief and anti-reflection is carried put, the coal chips are used as the abrasive material to be taken conveniently and locally, underground environmental pollution can be reduced, and economic cost is saved; and in addition, the slurry pump is adopted to generate the pulse jet flow with adjustable pulse frequency, so that the problem that a current pulse jetflow is difficult to apply in the field is solved, the water cushion effect can be effectively avoided, and the coal breaking efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of coal seam pressure relief and permeability enhancement and gas drainage, and in particular relates to a passive squeeze pulse coal chip jetting coal pressure relief and permeability enhancement device and a use method. Background technique [0002] Coal and gas outburst is the most serious dynamic disaster faced in coal mining, which seriously affects the normal production of coal mines. As the mining depth of coal mines in China has increased year by year in recent years, the gas has suffered from high stress, high gas pressure and low permeability. The characteristics of coal seams are present in coal seams, and the difficulty of mining coal resources is increasing. Therefore, it is necessary to strengthen the original coal seam pressure relief and permeability enhancement and gas drainage technologies. The current coal seam pressure relief and permeability enhancement technologies mainly include deep hole bl...

AI Technical Summary

Problems solved by technology

[0002] Coal and gas outburst is the most serious dynamic disaster in coal mining, which seriously affects the normal production of coal mines. The characteristics exist in the coal seam, and the difficulty of mining coal resources is increasing. Therefore, it is necessary to strengthen the original coal seam pressure relief and permeability enhancement and gas drainage technology. The coal seam pressure relief and permeability enhancement technology currently used mainly includes deep hole blasting, water Hydraulic measures such as jet slotting, reaming, and cavitation can enhance the effect of gas extraction by increasing the number of coal seam cracks, releasing coal seam stress, and improving coal seam permeability. Deep hole blasting is used to relieve pressure and increase permeability of coal seams. Explosives are mainly used. The stress wave generated during blasting increases the number of cracks in the coal seam and thus improves the permeability of the coal seam. However, the transportation of explosives and underground operations are relatively dangerous and difficult to operate. Currently, the most widely used technology is hydraulic measures to relieve pressure and increase permeability. Using high-pressure water jets to slit, ream, and create holes in the coal seam to relieve the pressure of the coal seam and increase its permeability. This technology has developed relatively maturely, but the high-pressure water jet has high pressure but shallow erosion depth and greater safety. The problem of hidden dangers, and then the corresponding development of high-pressure abrasive water jet, high-pressure pulse water jet pressure relief and anti-reflection technology, these technologies have overcome the problem of shallow erosion depth of high-pressure water jet, high-pressure abrasive water jet uses abrasive particles at high speed The impact improves the efficiency of jet rock breaking. According to the abrasive mixing method, it can be divided into pre-mixing and post-mixing. The pre-mixing abrasive water jet is more fully mixed with water and abrasive, and the abrasive accelerates for a longer time to obtain higher energy. It impacts and breaks rocks. The effect is more obvious, so the front-mixing abrasive water jet erosion effect is better under the same conditions, but no matter which method is used, it is difficult to apply it on a large scale underground due to the problem of continuous feeding and the complexity of the equipment. In addition, the waste abrasive water and coal chips produced will cause waste of water resources and pollute the underground environment. High-pressure pulsed water jets can effectively avoid the water cushion effect, and use the characteristics of water hammer pressure effect, high-frequency impact pressure and high-speed lateral flow to improve rock breaking performance. Efficiency, according to the formation mechanism of the pulse jet, it can be divided into extrusion type, cut-off type, and excitation type. The extrusion type pulse water jet is formed by the impact piston hitting the extrusion piston and then extruding the water body to form a high-speed jet with a large diameter and intermittent emission. The forming device is relatively complicated, and it is difficult to apply it in the field. The interrupted pulse jet is formed by the high-speed rotation of an external disc with holes to periodically intercept the continuous jet. It is difficult to apply. The realization of these two kinds of pulse jets requires complex other excitation devices. Compared with the first two kinds of jets, the excited pulse jet can form high-frequency pulse jets, but the pressure fluctuation range is small, and intermittent emission cannot be realized. The capacity of hard rock is low, so there is no high-pressure pulse jet technology that can be applied to the field

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