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air supply air-dried amount apparatus average bagasse bituminous boiler furnace bomb briquettes British thermal unit burner burning by-products calorific value calorimeter carried cent chemical chimney clinker coal coke and coke-breeze coke-oven combustion chamber cost creosote creosote oils crucible crushing cubic feet cubic foot designed destructor destructor plant distillation dried economiser employed erected figures firing fixed carbon flues forced draught gas engines Gas Producer gas-producer gasification Germany grate area heat value heating surface hour hydrocarbon hydrocarbon gases inch installed Lancashire Lancashire boiler lignite loss low-grade fuels lump material mechanical stokers method mines moisture obtained oils operation ordinary oxygen pass peat percentage pitch portion power station pressure purposes refuse retorts sample square feet square foot steam boilers steam-raising stokers superheater temperature thermal tons tubes type of boiler utilisation volatile matter waste fuel waste gases waste heat waste-heat water-tube boiler weight Wiesmoor