With　the　rapid　development　of　low-rank　coal　chemistry　industry,　the　production　of　ultra-low　volatile　carbon-based　solid　fuels　(pyrolyzed　and　gasified　semi-cokes)　with　inferior　combustion　performance　has　been　continuing　a　rising　trend.　The　semi-cokes　blended　with　bituminous　coal　in　utility　boiler　is　considered　as　a　promising　approach　to　realize　the　efficient　and　clean　utilization　of　low-rank　coal.　Nevertheless,　the　co-combustion　features　and　kinetics　of　ternary　blending　are　still　unclear　and　less　work　has　focused　on　the　thermal　interactions　between　bituminous　coal　and　various　semi-cokes.　Here,　the　thermogravimetric　experiments　were　employed　to　elucidate　the　co-firing　characteristics　of　various　carbon-based　solid　fuels.　The　results　show　that　the　ignition　temperatures　of　blended　fuel　are　decreased　by　co-firing　bituminous　coal,　and　the　ignition　temperature　of　blend　is　lower　than　that　of　linear　additivity.　Under　the　conditions　of　70%　pyrolyzed　semi-coke　blended　with　30%　bituminous　coal,　the　ignition　temperature　is　reduced　by　9.3%　and　the　burnout　temperature　is　increased　by　70.6%　with　the　heating　rate　raised　from　10　°C/min　to　40　°C/min.　The　apparent　activation　energy　of　blend　is　higher　than　linear　additivity　when　the　pyrolyzed　semi-coke　proportion　is　lower　than　40%.　The　negative　effects　of　semi-cokes　on　blends　are　reduced　when　the　bituminous　coal　is　blended　with　both　pyrolyzed　and　gasified　semi-cokes.　The　ignition　temperature,　burnout　temperature　and　combustion　index　change　linearly　with　the　fraction　of　semi-coke.　The　results　could　provide　guidance　for　the　clean　and　efficient　utilization　of　semi-cokes　in　utility　boiler.　©　2021