TY JOUR TI A System for the Joint Use of Coalbed Lean Methane and Biogas to Generate Electricity in Coal Mines KW Coalbed methane KW methane-air mixtures KW biogas KW power generation KW resource conservation KW emission reduction KW low-carbon systems JO Proceedings of Petersburg Transport University AU Haritonenko, A.L. AU Zav'yalov, A.B. AU Zachinyaev, Y.V. PY 2023 IS 20 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"