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research on one borehole hydraulic coal mining system

Research on One Borehole Hydraulic Coal Mining System ...

2008-7-1  The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This paper presents a case study of ...

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Research on One Borehole Hydraulic Coal Mining System ...

The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This paper presents a case study of ...

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Research on One Borehole Hydraulic Coal Mining System ...

The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water ...

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Research on One Borehole Hydraulic Coal Mining System ...

The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This paper presents a case study of hydraulic borehole coal mining.

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Hydraulic borehole mining (Conference) OSTI.GOV

The borehole hydraulic coal mining system accesses the coal seam through a hole drilled in the overburden. The mining device is lowered through the hole into the coal seam where it fragments the coal with high-pressure water jets. The fragmented coal is pumped to the surface as a slurry by a jet pump located in the center of the mining device.

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Design of hydraulic mining equipment and experiments

As a new unconventional mining method, boring hydraulic mining technology has its unique advantages for mining easily dispersed, loose, porous and weakly cemented solid minerals. On the basis of principle of boring hydraulic mining, the study mainly on the ...

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Evaluation of Borehole Hydraulic Fracturing in Coal Seam ...

2020-11-17  Accurate evaluation of the influence range of borehole hydraulic fracturing (HF) in coal seam is crucial for optimizing the design scheme of HF. In this study, we adopted the microseismic (MS) monitoring technology to monitor and characterize the spatial shape of cracks caused by borehole HF in coal seam in an underground coal mine. And we also tested and analyzed the stress and moisture ...

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hydraulic system of coal mining machinery

Research On One Borehole Hydraulic Coal Mining System. Research On One Borehole Hydraulic Coal Mining System Prompt Caesar is a famous mining equipment manufacturer well-known both at home and abroad major in producing stone crushing equipment mineral

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Research on Application of Hydraulic Fracturing Enhanced ...

2019-10-25  Coal and gas outburst accident is one of the critical disasters restricting the safety production of coal enterprises in China. To solve the problems of low permeability and difficulty in gas extraction, a hydraulic fracturing test was carried out according to the occurrence characteristics of coal and rock gas in Pingdingshan Coal Mine No. 12; and the change law of the gas concentration and ...

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Application of a hydraulic borehole mining apparatus to ...

The U.S. Department of Energy's Office of Scientific and Technical Information

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In-Situ Leaching Borehole Mining

2019-1-14  Borehole Mining. Although the Bureau had not been engaged in hydraulic borehole mining research prior to FY 1974, it had been actively engaged in research to utilize hydraulic jet cutting technology for safer, more efficient mining of coal and other

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A new cross‐borehole hydraulic caving technique in the ...

borehole and the permeability of the coal around the borehole are. Hydraulic slotting can enhance permeability by cutting coal seam fractures with high-pressure water jet. Therefore, hydraulic flushing and hydraulic slotting are often used to enhance permeability in coal mines. A lot of research on hydraulic slotting have been done in

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hydraulic mining of coal - greenrevolution.org

Research on One Borehole Hydraulic Coal Mining System The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal

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Variation in the Pore Structure of Coal after Hydraulic ...

2018-3-1  The borehole hydraulic coal mining system was demonstrated to be a feasible method for hydraulic mining (Xia et al. 2008). The method involves fragmenting coal seams by high-pressure water jet and removing coal slump through a drilled hole by hydraulic or airlifting methods. More recently, a novel hydraulic method for underground mining of a ...

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Experimental research on the performances of water jet ...

2018-6-20  It follows the same basic principles as the high-pressure jet grouting and hydraulic coal mining, they all use high-pressure jet to break the ore bed or the rock and soil mass [14–17]. Moreover, borehole hydraulic mining technology has many advantages. The most significant advantage is that the method does not need to remove the overlying strata.

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Study on Borehole Arrangement Methods for Gas

2020-10-28  Research Article Study on Borehole Arrangement Methods for Gas Extraction by Hydraulic Slotting in Long-Distance Through-Coal Seam Tunnel Cunfang Zhu1 and Shuang Cai 2 1Qinghai Local Railway Construction Investment Co. Ltd., Xining 810001, China 2China Merchants Chongqing Communication Research Design Institute Co., Ltd., Chongqing 400067, China ...

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Research on Monitoring Technology of Influence Range

2018-12-17  Research on Monitoring Technology of Influence Range of Coal Mine Hydraulic Fracturing . Wang Kai . 1, a *, Dai Linchao. 2, Zhou Dongping. 1. 1. Gas Research Branch, Chongqing Energy Investment Group Science Technology Co., Ltd, Chongqing

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Research and Application of Hydraulic Measures

2020-12-21  hydraulic fracturing on low permeability coal seam, the author selected a floor roadway of No.2 level and No.1 mining area in Huainan mine. the occurrence structure of one group of coal in the mining area is stable, with an average coal thickness of 70 m. , and there is 0.9 m thick gangue in the middle. The gas content is 9.1 ~ 11.7 m

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Application of a hydraulic borehole mining apparatus to ...

The U.S. Department of Energy's Office of Scientific and Technical Information

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hydraulic mining of coal - greenrevolution.org

Research on One Borehole Hydraulic Coal Mining System The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal

Read More
Variation in the Pore Structure of Coal after Hydraulic ...

2018-3-1  The borehole hydraulic coal mining system was demonstrated to be a feasible method for hydraulic mining (Xia et al. 2008). The method involves fragmenting coal seams by high-pressure water jet and removing coal slump through a drilled hole by hydraulic or airlifting methods. More recently, a novel hydraulic method for underground mining of a ...

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Rapid Drilling Technology and Equipment for borehole

2021-11-4  With the development of underground mining technology in coal mines, there is a greater demand for large diameter borehole drilling. CCTEG Xi’an Research Institute has developed technology and equipment for drilling holes with large diameters of Ф500mm and above. The large-diameter drilling technology has opened up new construction methods ...

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A new cross‐borehole hydraulic caving technique in the ...

borehole and the permeability of the coal around the borehole are. Hydraulic slotting can enhance permeability by cutting coal seam fractures with high-pressure water jet. Therefore, hydraulic flushing and hydraulic slotting are often used to enhance permeability in coal mines. A lot of research on hydraulic slotting have been done in

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EVALUATION OF BOREHOLE MINING AT THE HANSEN

2012-2-12  Hydraulic Borehole Mining (HBHM) has been utilized in several applications in varying geological conditions since the 1970’s when the United States Bureau of Mines (USBM) developed an experimental mining system to research this mining technology. Remote mining from a borehole by cutting the target ore with

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Research on Monitoring Technology of Influence Range

2018-12-17  Research on Monitoring Technology of Influence Range of Coal Mine Hydraulic Fracturing . Wang Kai . 1, a *, Dai Linchao. 2, Zhou Dongping. 1. 1. Gas Research Branch, Chongqing Energy Investment Group Science Technology Co., Ltd, Chongqing

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Research and Application of Hydraulic Measures

2020-12-21  hydraulic fracturing on low permeability coal seam, the author selected a floor roadway of No.2 level and No.1 mining area in Huainan mine. the occurrence structure of one group of coal in the mining area is stable, with an average coal thickness of 70 m. , and there is 0.9 m thick gangue in the middle. The gas content is 9.1 ~ 11.7 m

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Research support measures in mine roadways prone to ...

2021-5-6  directional hydraulic fracturing [12,13], coal seam blasting pressure relief [14–16], coal seam large-diameter borehole pressure relief, coal seam high-pressure water injection [17], floor blasting and floor cutting. Kang and co-workers [18,19] found that coal and rock masses form the main bodies of

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Research on Hydraulic Technology for Seam Permeability ...

Downloadable! Coalbed methane (gas) is a high quality and clean resource, but it also causes disasters in coal mines in China. The low permeability of coal seams is the main reason that developing coalbed methane (CBM) as an energy resource is difficult, so increasing coal seam permeability is the key to CBM development in China. In this paper, the principal techniques for seam permeability ...

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