Key technologies and equipment for a fully mechanized top-coal caving operation with a large mining height at ultra-thick coal seams

• DOI: 10.1007/s40789-015-0071-4
• Publication Date: 2015-07-20T01:07:49Z
• Authors: Jinhua Wang; Bin Yu; Hongpu Kang; Guofa Wang; Debing Mao; Yuntao Liang; Pengfei Jiang
• Keywords: 0211 other engineering and technologies; 02 engineering and technology; 7. Clean energy

Thick and ultra-thick coal seams are main for high production rate efficiency in Chinese mines, which accounts 44 % of the total minable reserve. A fully mechanized top-coal caving mining method is a underground extraction seams. The technologies less than 14 m thick were extensively used China. However, with thickness greater m, there have been no reported cases world mechanical safe performance, recovery ratio. To deal this case, China Coal Technology & Engineering Group, Datong Mine other 15 organizations launched fundamental big project to develop equipment thicknesses m. After completion project, was developed large height, as well ground control theory In addition, technology support roadway cross-section, prevention gas fire hazards applied. Furthermore, hydraulic height 5.2 shearer reliability, auxiliary manufactured. Practical implication on successfully completed at No. 8105 face Tashan mine, Datong, major achievements summarized follows: 1. proposed cutting 5 structural model overlying strata called cantilever beam-articulated rock beam established. Based model, load resistance determined. With analysis, movement characteristics top above evaluated during operation height. successful development comprehensive preventing controlling spalling wall, This means that overcome difficulties control, recovery, enabled achieve more 10 Mtpa single seams; 2. supporting anti-rockburst capacity, scraper conveyor power back face, long distance headgate belt study has key improving reliability challenges equipping 3. deformation cross-section discovered. findings above, series bolt materials yielding strength 500–830 MPa extension ratio, cable material 1 × 19 structure, tonnage ratio developed. order fast advance, installation pre-tension solve problems height; 4. distribution uneven emission evaluated. application drainage roof, intensive operations, known "low content, emission", solved. flow-rate mobile making nitrogen Mtpa. case apply conducted mine demonstrates three units equipment, i.e., support, conveyor, rationally equipped. Average usage 92.1 %. up 88.9 2011, reached 10.849 Mtpa, exceeding target performed by Chinese-made equipment. provide way extracting Currently, 13 areas including Pingshuo, Shendong Xinjiang. exploitation resources Western China, great potential