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coal mining high pressure water

High pressure water jet mining machine (Patent) OSTI.GOV

@article{osti_5862957, title = {High pressure water jet mining machine}, author = {Barker, C R}, abstractNote = {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

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Study on Coal Mining Technology of Static High Pressure

Coal and gas bursting is an important factor of causing coal mine safety accident, it may cause major accident, even effect on the safety of human life. Human disturbance is an important factor of causing coal and gas outburst. In this paper under the enlightenment of the water injection dustproof, the coal technology of static high pressure water expanding were researched and developed.

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Management and Utilization of High-Pressure Floor

2019-11-1  This study analyzed the failure characteristics of the coal seam floor induced by longwall mining to manage and eliminate possible hazards associated with high pressure (8.0 MPa) floor-confined water in the Xinjulong coal mine. The disturbed floor was divided into mining failure (MF), water-resistant (WR), and confined water intrusion (CWI) zones. The MF and CWI zones have lost their ability

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Experimental study on floor failure of coal mining above

2019-2-7  Water inrush accidents were currently one of the most frequent forms of disaster in coal mines where the mining seams were above a major acquirer with high pressure water. Understanding the fracturing process of mining floor under the effect of highly pressurized water underneath was essential for preventing water inrush. A testing system simulating such cases was developed. This system is

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Research on the Coal Seam Permeability-Increasing

2021-3-14  Research Article Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application Xingang Niu ,1,2,3,4 Biming Shi,1,2 Zhigang Zhang,3,4 and Yongjiang Zhang3,4 1State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, China

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Mining Hauhinco Maschinenfabrik

High pressure and water spray pump stations for longwall mining. A reputable supplier in coal mining for more than 111 years. Since its founding more than 100 years ago, Hauhinco has been closely linked with underground coal mining. With our water hydraulic competence we design individually tailored pump stations for underground mines.

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A prediction model for the slot depth of high pressure

2018-12-1  Hydraulic slotting in underground coal mine . (a) Slotting coal seam by high-pressure water jet. (b) Gas drainage under sub-pressure. Download : Download high-res image (123KB) Download : Download full-size image; Fig. 2. High pressure water jet impact process . Stage I is the water hammer pressure stage, and stage II is the stagnation pressure

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The Application of Water Jets in Coal Mining

2020-11-4  design of a longwall water jet mining ma­ chine. The results of this study indi­ cated that, for a given horsepower, coal would be mined more effectively with a lower pressure, larger diameter water jet than with an ultra high pressure, small diameter jet. The results can be illustrated with refer­ ence to two curves which were derived from

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Effective Methane Extraction Radius after High-Pressure

2020-8-1  The schematic diagram of the high-pressure water jet system in the coal seam. The most important parameter to consider during this process is the effective methane extraction radius after high-pressure water jet slotting, which has been determined empirically. A methane pressure of 0.74 MPa was set as the coal and gas outburst risk criterion according to the Specification of Coal and Gas Outburst

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7 Different Types of Mining Processes NewsMag Online

2020-3-12  With hydraulic coal mining, water is pushed at high pressure against the ore’s surface, breaking away the chunks bit by bit. The water, with the bits of coal in tow, are then pushed through a pipe to the surface, where the coal is filtered out of the water. One of the major advantages of hydraulic coal mining is that the water minimizes the chances of fire and explosion, and it reduces the amount

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NIOSHTIC-2 Publications Search 10000255 Coal Mining

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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Elimination of coal and gas outburst risk of low

Based on the characteristics of high‐pressure water jet slotting technology, the heading face in the 11071 ventila- tion road, No. 7 coal seam, Shihuatian Coal Mine, Guizhou

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A prediction model for the slot depth of high pressure

2018-12-1  Hydraulic slotting in underground coal mine . (a) Slotting coal seam by high-pressure water jet. (b) Gas drainage under sub-pressure. Download : Download high-res image (123KB) Download : Download full-size image; Fig. 2. High pressure water jet impact process . Stage I is the water hammer pressure stage, and stage II is the stagnation pressure

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Innovative Techniques in Underground Mining for the

The last preventive technique, the injection of water, is used with the end of increasing the level of moisture and reducing the capacity of the coal to accumulate elastic deformation energy and increasing its plastic deformation energy [11,12].This is because when the humidity of coal under high-pressure increases, water molecules try to occupy the empty spaces and displace the methane

get price

Experimental study on floor failure of coal mining above

2019-2-7  Water inrush accidents were currently one of the most frequent forms of disaster in coal mines where the mining seams were above a major acquirer with high pressure water. Understanding the fracturing process of mining floor under the effect of highly pressurized water underneath was essential for preventing water inrush. A testing system simulating such cases was developed. This system is

get price

Distribution Characteristics of High Pressure —Bio-101

When the coal seam is not mined, the water pressure of the L8 limestone, L2 limestone, and Ordovician limestone aquifers generally depends on their water head height. Taking the shallow aquifer as an example, its hydraulic gradient value is relatively small, which causes its water pressure to be low. But with the increase of the buried depth of the aquifer, the water pressure also increases.

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High-Pressure and Water Spray Pump Mining

2017-10-27  Three EHP-3K 200 HP Pumps were installed for the water spray pump station. The Hauhinco Service and our Chinese partner made product training for the mine employees on site and also accompanied the commissioning. To accomplish the pursued coal output, the customer has chosen a durable and reliable high-pressure supply.

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StudyontheKeyTechnologyofControllingtheInstabilityofDeep

2021-8-6  Lu and others [11] used 40∼60MPa high-pressure water jet cutting measures for gas control in Rujigou coal mine, effectively improved the coal seam permeability, in-creased the gas drainage efficiency by 3∼6 times, and Coal Mine is 0.0063d−1, the permeability coefficient is 0.412∼0.88m 2/MPa •d, and the firmness coefficient is

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Dynamic tensile properties, deformation, and failure

2021-3-29  Water is one of the main factors affecting the mechanical properties of materials. In coal mining engineering, high ground pressure disturbances are prone to inducing secondary engineering

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Permeability evolution in tectonic coal: The roles of

2021-4-6  When coal is soaked in high pressure water (5–20 MPa), the moisture content in coal will increase from 2.60 to 3.85% with the increasing of water pressure. (2) The permeability of soaked coal decreased with the increasing of gas pressure, while the permeability of natural coal firstly decreased and then increased with the pore pressure decrease.

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Innovative Techniques in Underground Mining for the

The last preventive technique, the injection of water, is used with the end of increasing the level of moisture and reducing the capacity of the coal to accumulate elastic deformation energy and increasing its plastic deformation energy [11,12].This is because when the humidity of coal under high-pressure increases, water molecules try to occupy the empty spaces and displace the methane

get price

High-Pressure and Water Spray Pump Mining

2017-10-27  Three EHP-3K 200 HP Pumps were installed for the water spray pump station. The Hauhinco Service and our Chinese partner made product training for the mine employees on site and also accompanied the commissioning. To accomplish the pursued coal output, the customer has chosen a durable and reliable high-pressure supply.

get price

Distribution Characteristics of High Pressure —Bio-101

When the coal seam is not mined, the water pressure of the L8 limestone, L2 limestone, and Ordovician limestone aquifers generally depends on their water head height. Taking the shallow aquifer as an example, its hydraulic gradient value is relatively small, which causes its water pressure to be low. But with the increase of the buried depth of the aquifer, the water pressure also increases.

get price

Dynamic tensile properties, deformation, and failure

2021-3-29  Water is one of the main factors affecting the mechanical properties of materials. In coal mining engineering, high ground pressure disturbances are prone to inducing secondary engineering

get price

StudyontheKeyTechnologyofControllingtheInstabilityofDeep

2021-8-6  Lu and others [11] used 40∼60MPa high-pressure water jet cutting measures for gas control in Rujigou coal mine, effectively improved the coal seam permeability, in-creased the gas drainage efficiency by 3∼6 times, and Coal Mine is 0.0063d−1, the permeability coefficient is 0.412∼0.88m 2/MPa •d, and the firmness coefficient is

get price

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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Mining Systems for Roof Support & Dust Suppression

Mining Experience. For over 20 years HYDROWATT has supplied high-pressure pumps to the mining industry, building continuously on experience gained in the French, German and British coal mines. Many of these improvements result from the close relationships developed with mining

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Simulation Study of Coal Failure Law under High

high-pressure water jetting measures must be studied based on relevant mechanical parameters of the coal body. Therefore, this study examines the coal destruction impinged by high-pressure water jetting by using Fast Lagrangian Analysis of Continua 3D(FLAC3D) software. Subsequently, the law and finding ways to determine the

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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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NIOSHTIC-2 Publications Search 10000255 Coal Mining

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,

get price