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coal fired boiler heat exchanger - das . biomass and coal fired thermal oil boiler - hieroglyphs.in. Thermal Oil Boiler - mkboilergroup.com. 2018-10-19 · Thermal oil boiler is a new type of heating equipment, with coal, oil,gas, biomass, as fuel and flue gas as heat source, heat conduction oil gas the heat carrier, through the circulate in liquid phrase,and transfer heat to heat user equipment.