Design and manufacturing of 13 MW burners for high-calorific (retort) gas of oil shale processing. Reconstruction of the oil shale boiler BKZ-75-39F for combined firing of oil shale, retort (high-calorific) gas and generator (low-calorific) gas. Two retort gas burners were additionally installed on BKZ-75-39F boiler. Customer - VKG Energia OÜ.