coal mining high pressure water

High pressure water jet mining machine (Patent)

A high pressure water jet mining machine for the longwall mining of coal is described. The machine is generally in the shape of a plowshare and is advanced in the direction in which the coal is cut.

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Study on Coal Mining Technology of Static High

In this paper under the enlightenment of the water injection dustproof, the coal technology of static high pressure water expanding were researched and developed. And the main equipment of coal and the process flow and the mechanism of rock breaking and the matters needing attention were introduced.

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(PDF) Grouting for ensuring coal mining safety above ...

The inrush accident occurred in October 2002 in the mined-out area with a high water pressure of 7.6MPa and a high water temperature of 51°C.

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DESULFURIZATION OF COAL BASED ON HIGH PRESSURE

2015-7-14  By high pressure water jet mill grinding coal in conjunction with the normal flotation processing, a much higher combustible recovery (i.e. the concentrates) was achieved with much lesser ash content in it, compared with the identical chemical conditions using ball mill for fine grinding

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The Application of Water Jets in Coal Mining

2020-11-4  currently mined in a coal mine using high pressure water jet technology. The use of water jets has shown sufficient promise that there are several research programs currently being funded by the U.S. Bureau of Mines and other Federal agencies in the field of excavation technology. Three current areas of water jet mining are described.

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(PDF) Hydro Jet System for Coal Mining

2010-11-19  High Pr essure Water Jet for mining o f co al. High Pressure Water Jet mining is a process using water, and so metimes an abrasive, which is forced through a small nozzle, between 20,000 psi t

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Application of high-pressure water jet technology and

2016-9-1  There are two ways for high-pressure water jet to cut the coal. Fig. 1a demonstrates that high-pressure water jet can cut the coal in a discontinuous and rotational way.Fig. 1b demonstrates that it can cut the coal in a continuous and rotational way.The way of Fig. 1a can achieve pressure relief and strong permeability in the coal, and this way can provide advantageous condition for gas ...

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Mining – Hauhinco Maschinenfabrik

Hauhinco is a successful, medium-sized family business with a long tradition. Today the company is a leading provider in the area of water hydraulic applications. Our high pressure plunger pumps, valves and systems are used in underground in underground mining and industry all over the world. Our employees are the key to success.

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Study on the mechanisms and prevention of water

2019-10-11  Coal mine formations are becoming increasingly threatened by water inrush accidents resulting from high-pressure water conditions in limestone formations below mines with increasingly greater mining

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Theory and Technology System of Green Coal Mining for

2013-12-24  Hanxing subjacent coal mining come from the water bursting of Ordovician limestone with high confined -pressure and powerful water- rich. While the Karst sinkholes are main channel which led to a major water inrush accident, accurate predicted and precise located Karst sinkhole detection are the key of water bursting

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NIOSHTIC-2 Publications Search - 10000255 - Coal

The objective of this research (Contract No. H0111789) was to determine the engineering feasibility of high-pressure water-jet coal mining and the degree of dust and noise health hazard associated with this mining technique. A portable water-jet device suitable for field use was designed, fabricated, and tested. The results indicated that with a hydraulic jet operating at 50,000 and 100,000 psi,

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DESULFURIZATION OF COAL BASED ON HIGH PRESSURE

2015-7-14  China University of Mining and Technology Beijing, P.R. China ABSTRACT High pressure water jet grinding and mineral processing technology has been combined with a view to reduce the sulphur and as h content of finely ground coal, fo r the purpose of preparation of super-clean coal water

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High pressure water jet mining machine - The

A high pressure water jet mining machine for the longwall mining of coal is described. The machine is generally in the shape of a plowshare and is advanced in the direction in which the coal is cut. The machine has mounted thereon a plurality of nozzle modules each containing a high pressure water jet nozzle disposed to oscillate in a ...

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(PDF) Grouting for ensuring coal mining safety above ...

PDF On Sep 5, 2013, Wanghua Sui published Grouting for ensuring coal mining safety above limestone aquifers with high water pressure Find, read and cite all the research you need on ResearchGate

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Dynamic Destruction of High Pressure Water to the

At present, the mines in our country gradually shift from the shallow mining to the deep mining, but the deep well floor is particularly serious hazard by high pressure underground water.This article considers the high pressure underground water as three-dimensional transient flow, sets up mechanical model by combining mechanical knowledge and to analyze the destructive action on floor from ...

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Application of high-pressure water jet technology and

2016-9-1  There are two ways for high-pressure water jet to cut the coal. Fig. 1a demonstrates that high-pressure water jet can cut the coal in a discontinuous and rotational way.Fig. 1b demonstrates that it can cut the coal in a continuous and rotational way.The way of Fig. 1a can achieve pressure relief and strong permeability in the coal, and this way can provide advantageous condition for gas ...

More

Study on the mechanisms and prevention of water

2019-10-11  Coal mine formations are becoming increasingly threatened by water inrush accidents resulting from high-pressure water conditions in limestone formations below mines with increasingly greater mining depths. This paper focuses on the floor of a deeply buried coal seam and the high-pressure fully mechanized mining faces of the Chensilou Coal

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Theory and Technology System of Green Coal Mining for

2013-12-24  With the increase of mining depth and intensity, especially into the subjacent coal mining, mining environment becomes increasingly complex, water pressure, ground stresses and ground temperature grow continually, threats from groundwater in Ordovician limestone with high confined -pressure and powerful water- rich become obvious, the

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Monitoring and numerical simulation of water inrush ...

2016-7-31  In this case, coal mining above confined water with high pressure conditions which proposed along with the exhaustion of shallow coal recourses in China, the complication of mining conditions, the increasing depth of mining is a high level of difficulty production technology under certain special geological backgrounds.

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7 Different Types of Mining Processes – NewsMag

2020-3-12  7. Hydraulic mining. Hydraulic mining uses water to break the ore away and carry it to the surface. In underground mining, one of the most difficult problems to solve is how to get the coal back up to the surface. With hydraulic coal mining, water is pushed at high pressure against the ore’s surface, breaking away the chunks bit by bit.

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DESULFURIZATION OF COAL BASED ON HIGH PRESSURE

2015-7-14  China University of Mining and Technology Beijing, P.R. China ABSTRACT High pressure water jet grinding and mineral processing technology has been combined with a view to reduce the sulphur and as h content of finely ground coal, fo r the purpose of preparation of super-clean coal water

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Influence of High-Pressure Water Injection on the

High-pressure water injection, as an important measure for coal and gas outburst prevention, is still under-researched, especially its mechanism on the coal pore structure. The anthracite samples taken from no. 3 coal seam in Xinjing coal mine were dried and injected with high-pressure water, after

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Application of high-pressure water jet technology and

2016-9-1  There are two ways for high-pressure water jet to cut the coal. Fig. 1a demonstrates that high-pressure water jet can cut the coal in a discontinuous and rotational way.Fig. 1b demonstrates that it can cut the coal in a continuous and rotational way.The way of Fig. 1a can achieve pressure relief and strong permeability in the coal, and this way can provide advantageous condition for gas ...

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Hot Water Pump High Pressure Multistage For Coal

Hot Water Pump High Pressure Multistage For Coal Mining Transport Water Features Cast iron, duct alloy, carbon steel, zinc free bronze, silicon brass or stainless steel construction (other materials available on request) High efficiency double suction

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Dynamic Destruction of High Pressure Water to the

At present, the mines in our country gradually shift from the shallow mining to the deep mining, but the deep well floor is particularly serious hazard by high pressure underground water.This article considers the high pressure underground water as three-dimensional transient flow, sets up mechanical model by combining mechanical knowledge and to analyze the destructive action on floor from ...

More

Study on the Theory of High Pressure Water Jet Coal ...

In order to solve the problems of gas extraction and pressure relief and permeability enhancement under low permeability and high surrounding rock stress conditions in deep coal seams, the ultra-high pressure hydraulic cutting technology is proposed. The mechanical mechanism of coal breaking by high pressure water jet is analyzed. The process of coal breaking by jet is divided into stress wave ...

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Coal Mine Super High Pressure Hydraulic Slotted Anti ...

Coal Mine Super High Pressure Hydraulic Slotted Anti-reflection Technology and Applicable Conditions Yongjiang Zhang1, 2, 3, a * and Zhanjin Lu2, 3, b 1Anhui University of science and technology Huainan 232001 2National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China

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Dynamic tensile properties, deformation, and failure ...

2021-3-29  In coal mining engineering, high ground pressure disturbances are prone to inducing secondary engineering disasters, producing water-conducting cracks, thus forming a large amount of mine water

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High Pressure Grouting Machine - China coal mining ...

High pressure grouting machine is a kind of high pressure chemical grouting used in structure grouting machine with the sophisticated proper design easy to carry and portable, the special material of wear resistant, high-pressure perfusion spraying machine are successfully developed by Shenglong.

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Monitoring and numerical simulation of water inrush ...

2016-7-31  In this case, coal mining above confined water with high pressure conditions which proposed along with the exhaustion of shallow coal recourses in China, the complication of mining conditions, the increasing depth of mining is a high level of difficulty production technology under certain special geological backgrounds.

More