YLL Vertical Coal Fired Thermal Oil Boiler Coal fired vertical thermal oil boiler use coal as fuel, the heat transfer oils is heated in the boiler first, then the thermal oil flow in a closed loop pipe to the heated equipment and then return to the thermal oil heater again, in this way, the heated object can reach a high temperature (Max. 320?) with indirect heating. It is especially suitable for industies which are flames prohibited Bidragon biomass and wood fired thermal oil heater is high efficient compared with other heating systems. 1. Multi-passes thermal conductive structure to improve the thermal efficiency greatly 2. Horizental tubes can reduce the heat loss. 3. Thicker insulated layer to reduce heat loss by thermal radiation. 4. Intelligent control system makes biomass fired thermal oil boiler operation easier and more simple. Advantage of YLL Vertical Coal Fired Thermal Oil Boiler 1.The oil flow from the lower place to the high place,in this process, the produced gas can easily go out of the system. 2.Automatic feed coal fuel, automatic discharge the slags. 3.Fire grate use independent air chamber, and the air space is larger, so the burning will be more sufficiently.