Underground coal gasification - the Velenje Coal Mine energy and economic calculations

Abstract

Article Highlights • Energy and economic calculations for underground coal gasification were performed • The location for the pilot experiment in Velenje Coal Mine was reviewed • A new procedure for the estimation of the energy efficiency was proposed • The energy analyses for different examples of coal exploitation were compared • The viability of the underground coal gasification project in Velenje was determined

The pressure relief protection effect of different strip widths, dip angles and pillar widths of an underside protective seam

“…where r is the ratio; (P-2W) is the pillar core width; P is the pillar width, m; F is the safety factor; P u is the ultimate coal pillar load; and P a is the actual coal pillar load. The expressions of P u and P a are shown in Eq (12) and Eq (13) [66].…”

“…Because coal is an important energy source [1][2][3][4][5][6][7][8], research on the safety of coal production has become more detailed [9][10][11][12][13][14][15]. The development law of mining fractures of overlying strata and the traditional "three zones" theory is the basis for the research of first mining the underside coal seam mining to protect the coal group [16][17][18][19][20].…”