Tangkou Coal Mine Research Articles

Water Injection and Dust Removal in High-Pressure and Low-Porosity Coal Seam

Dust pollution is very serious in coal mining process, which is a great threat to the underground staff health and equipment and facilities safety. Coal seam water injection in mining process is an effective way to reduce coal mine dust concentration at the source. However, the effectiveness of water injection is limited in high-pressure and low-porosity coal seam. To improve the moisture content of coal seam, expand the wetting range and enhance the effect of dust reduction by water injection, the injectability and influencing factors of coal water injection are analyzed by numerical simulation method, and the sealing technology under high-pressure condition is studied. Then, according to the practical conditions of Tangkou coal mine, the parameters and process system of process system are designed, the effect of high-pressure water injection in coal seam was determined by testing water injection quantity, water increment and dust concentration. It is showed that the dust-removal rate of the high dust concentration operation such as falling coal and moving frame is 63.49% and 59.72%, the maximum dust-removal rate of multi-processes is 53%, which achieve a high level of application. The research results in this paper is of important theoretical and practical value to improve the water injection effect of high-pressure and low-porosity coal seam and improve the efficiency of dust removal in coal mining process.

The diffusion behavior law of respirable dust at fully mechanized caving face in coal mine: CFD numerical simulation and engineering application

Abstract Fully mechanized caving face (FMCF) serves as an important part of underground mining system in coal mines. The respirable dust of high concentration produced at FMCF seriously pollutes the underground working environment, and is hazardous to the physical and mental health of miners. In addition, the movement and flow of respirable dust are complicated in the underground environment and add difficulty to dust prevention. In the present work, the diffusion behavior of respirable dust at 5303 FMCF Tangkou Coal Mine of the Zibo Mining Group is studied by combining CFD simulation and field measurement. The results show that the respirable dust generated by back drum rushes into sidewalk space. Influenced by turbulence, the respirable dust from coal caving moves quickly into the sidewalk and pollutes this area. On the basis of the results and on-site condition, a comprehensive system for respirable dust control at FMCF has been proposed. With the application of the comprehensive system, the mean settlement rate of respirable dust reaches 91.06% in the main operation area for field technicians. The result demonstrates high efficiency of dustproof effect.

Coal pillar safety and surface deformation characteristics of wide strip pillar mining in deep mine

The wide strip pillar mining of Tangkou coal mine in Eastern China is the engineering background in the paper. Coal pillar safety and surface deformation characteristics of wide strip pillar mining in deep mine are studied by using in situ measurement, three-dimensional similar material simulation test, and theoretical analysis. Results show that in deep mine, the plastic zone’s width of coal pillar becomes larger obviously and the vertical stress of coal pillar presents a saddle-shaped distribution. The lateral deformation of coal pillar mainly concentrates on the area 9.5 m from the edge of coal pillar, which is discontinuous, stepped, and mutational. In addition, if only one working face with strip pillar mining is mined, the influence extent caused by coal mining is weaker and the surface subsidence and curvature are smaller. If multiple working faces with strip pillar mining are mined, the surface subsidence is obvious, the subsidence factor is 0.22, the subsidence basin is larger but gentler and uniform, and the surface deformation is continuous and long term. On the basis of the characteristics of wide strip pillar mining in deep mine, the safety of wide coal pillar in deep mine is checked.

Mine Soft Rock Roadway Fine Blasting Application Technology

The engineering background of this paper is located in the southern air return roadway of Tangkou Coal Mine. As a result of its characteristics such as deep buried depth, high ground pressure and enormous over-break, when drilling and blasting tunnels, fine management and control of blasting can be used to solve the problem of deep soft rock tunnel blasting precise molding and separated roadway. Field test procedures showed that compared with the original plan, this program can improve 38% of circulation footage, reducing the 50% of amount over-break of roadway,25% of cost savings, which achieved good technical and economic effects.

The Division of No 1304 Face in Tangkou Coal Mine and a Case Analysis

Based the analysis of the “3 zones” theory and index of spontaneous combustion in the mined out area, six measured points under which there are air sample collection probe and temperature sensor measuring the air composition and temperature of the mined out area of No 1304 face are arranged along both crossheadings of the mined out area in order to divide the “3 zones” of spontaneous combustion with the combination of the mining situation of No 1304 face in Tangkou coal mine. This present study mainly measures and analyzes the concentration of O2 and the temperature change and takes advantage of the Matlab and Excel to fit the concentration of O2 to determine the range of “3 zones”of spontaneous combustion in NO. 1304 face. Meanwhile, the concentration of CO is also measured and analyzed to determine the most prone location to fire of No. 1304.

Geological Factors Analysis of Gas Unusual Area in Southwest of Shandong Province

Gas geological law in southwest of Shandong province was studied with theoretical foundation and method of gas geology in this paper. It finds that the area in southwest of Shandong province is mostly low gas mining area. But Fucun coal mine of Tengnan mining area, Sanhekou coal mine, Jinyuan coal mine, Tangkou coal mine of Jining mining area and Zhaoguan coal mine of Huanghebei mining area are all gas unusual area. Among them, Fucun coal mine, Sanhekou coal mine and Jinyuan coal mine appear high gas unusual which are mainly affected by magma intrusion, Tangkou and Zhaoguan coal mine form gas unusual area which are mainly affected by thickness of upper bedrock.

Integrated utilization of low-grade thermal energy in hot coal mine

This paper explores the integrated utilization of low-grade thermal energy in hot coal mines, based on analysis of original heating, refrigerating, mine draining, bath draining and air exhaust systems, and in combination with the actual conditions of Tangkou Coal Mine in Shandong Province. It presents a set of comprehensive and integrated utilization schemes for the various different kinds of low quality heat energy. With heat pumps, the recycling of the low quality heat energy from the drainage, bathing water and the exhaust air can occur in winter, and in summer, there exists condensed heat of the refrigerating system. When in conjunction with solar collectors, the thermal utilization of solar power can be realized for the whole year. The system achieves mine drainage and bathing water purification and recycling, as well as purifying exhaust air by water spraying. It also satisfies the demands of a whole year’s bathing heat for the coal mine, with refrigeration in summer, and heating for the ground house and shaft house in winter. It is able to integrate different kinds of low quality heat energy and low emission drainage and dust, and can replace the traditional boiler heating system. Finally, the system reduces conventional energy consumption and the amount of mine water drainage.