By applying high-pressure (40–60 MPa) water jet slotting in Rujigou Coal Mine, Lu et al. (2010; 2009) effectively improved coal seam permeability and increased …
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 …
This work focused on the serious coal compression under buildings, railways, and water bodies in central and eastern China; the wide range of rock formation damage during the collapse mining process; the high pressure of mines; and difficulties in controlling surface subsidence after mining. The E1302 working face of Shanxi Gaohe …
The technology of increasing coal seam permeability by high-pressure water jet has significant advantages in preventing and controlling gas disasters in low-permeability coal seam. The structural parameters of a nozzle are the key to its jet …
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 …
High-pressure water and gas alternating sequestration technique was proposed. •. H–P-WGAS enhances methane migration in coal seam. •. Influence radius …
The negative pressure jet dust-removal water curtain was installed in the air return roadway of the 117 fully mechanized mining face of Jinjitan Coal Mine, and dust measurements were carried out in the air return roadway to check the dust reduction effect of the water curtain device (Fig. 16). A TSI9306 particle counter was used to measure …
this paper proposes the technology of weakening and relieving the residual coal pillar in the overlying goaf by a high-pressure water jet. Based on the geological occurrence of the …
The coal mining process may make cracks in the floor to connect the confined aquifers, causing water inrush from the coal seam floor. Through the inclusion theory and compression failure criterion, the failure model of floor crack structures in deep mining is built by adding the additional water pressure.
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 the continuous improvement of high-pressure water gen-erating devices, high-pressure water jet weakening technology has been applied to the prevention of dynamic disasters, control of hard roof stability in coal mines, and low-permeability coal seam gas extraction in underground coal mines. Relevant scholars [14–16] have used high ...
Connect the high-pressure water pipeline and the air pipeline, then turn on water pump and increase the pressure to the required critical rock-breaking pressure …
Coal is primarily used as fuel to generate electric power in the United States. In coal-fired power plants, bituminous coal, subbituminous coal, or lignite is burned. The heat produced by the combustion of the coal is used to convert water into high-pressure steam, which drives a turbine, which produces electricity.
Connect the high-pressure water pipeline and the air pipeline, then turn on water pump and increase the pressure to the required critical rock-breaking pressure of water jets. The mechanical parameters for coal in drilling testing site are as follows: dynamic compressive strength is 4.85 MPa; density is 1970 kg/m 3 ; and wave velocity …
As can be seen from Table 1, with the increasing of immersion pressure, the inherent moisture of the dried coal samples decreases, which indicates that the internal structure of the coal samples after high-pressure water immersion is looser, and the inherent moisture of the coal samples decreases slightly during the drying process.And …
Traditional chemical and mechanical descaling methods are expensive, inefficient and environmental pollution for removing scales in coal mine main drainage pipeline. In this study, a water jet is proposed to remove pipe scales, which can solve the inadequacies of traditional methods. Parametric optimization for water jet and descaling …
The scarcity of water resources and environmental pollution in the coal mining areas of western China severely restricts high-quality mine development and construction there. Treating mine water as a valuable unconventional water resource for large-scale processing and efficient utilization is a crucial approach. This paper …
where H is mining depth, m.α is dip angle of coal seam, °.L is tilt width of working face, m.. Based on Eq. and Eq(), we calculate the water-inrush coefficient of 81006 working faceTake H = 518 ...
Based on the geological occurrence of the No. 3 coal seam and mountain No. 4 coal seam in the Yanzishan coal mine, the high-pressure water jet pressure relief technology of residual coal pillars in the overlying goaf of close-distance coal seams was studied by theoretical analysis and field industrial tests. First, the elastic-plastic zone of ...
Study of dust suppression by atomized water from high-pressure sprays in mines. J China Univ Min Technol, 40 (2) (2011), pp. 185-189. ... Experimental study on atomization characteristics and dust suppression efficiency of high pressure spray in underground coal mine. J China Coal Soc, 40 (9) (2015), pp. 2124-2130. View in …
Coal mine water inrush threatens mining operations, pollutes the environment, and wastes significant water resources [17], [18]. The Yanzhou mining area is a typical North China-Type coalfield. ... The injection borehole was connected to the water pump through the high pressure water pipe and connected to the flow meter and …
The microstructure of bituminous coal can be changed significantly due to injection of CO2 fracturing fluid into the coal seam, affecting CBM production efficiency. To investigate the microstructural change characteristics of bituminous coal treated with high-pressure CO2 fracturing fluid at different treatment times (0–24 …
If coal is high in sulfur or other impurities, it is washed with a water or chemical bath, removing up to 40 percent of inorganic sulfur in the coal. Not all coal is prepared using the same process. High-sulfur coal commonly undergoes washing to meet environmental regulations, while low-sulfur coal is often crushed and resized without being washed.
Overall, the lateral high-pressure Ordovician limestone water seriously threatens the 3rd coal mining in the extension area of the Xinhe Coal Mine. The fracture structure is one of the critical factors inducing water damage in the mine ( Jia et al., 2019 ; Yan and Wang, 2018 ; Ma et al., 2018 ).
Daizhuang Coal Mine is located in Rencheng District, Jining City, Shandong Province is a typical North China type coal field. Mining area 1160 (Fig. 1) mainly exploits 16th coal seam, which is threatened by the immediate roof 10th limestone, floor 13th and Ordovician limestone water.Working face 11603 is located on the northeast side of the …
1. Introduction. Coal mining waste (CMW) is a by-product of mining and production of coal and it accounts for a significant share of coal production ranging from 10% to 15%, as a function of the variations in geological and mining conditions [1].CMWs have been utilized successfully in many low to medium level civil engineering …
To decrease the risk of high confined water from the coal seam floor and ensure the mining under the safe water pressure of limestone aquifers, the comprehensive exploration and regional treatment ...
The technology of increasing coal seam permeability by high-pressure water jet has significant advantages in preventing and controlling gas disasters in low …
This study analyzed the failure characteristics of the coal seam floor induced by longwall mining to manage and eliminate possible hazards associated with high …
High-pressure water jet technology has been widely used for the scale removal, rust removal or other cleaning opera-tions of containers, heat exchangers, condensers, pipes and so on in petroleum, chemical and shipbuilding industries (Guozhi and Zhining 2001). High-pressure water is formed by high-pressure pump and sent to a special nozzle by …
