抄録
Coal can be classified according to fixed carbon and calorific value, and each coal has different combustion characteristics. Anthracite is the most difficult coal to burn, because it has low volatile matter and high fixed carbon. Also, the temperature for starting devolatilization of anthracite is higher than that of the other coal. As a result, anthracite firing boiler is an arch firing type or fluidized bed type normally. In Vietnam, electric power demand is increasing year by year together with high economic growth. In view of energy security, it is important to use fuel produced in own country and to reduce imported fuel. Vietnam has many reserves of anthracite. Therefore, there is a strong demand to use it for coal firing power plant. IHI developed a new type of burner for low volatile fuel. The feature of this burner is that coal can be pre-heated in the chamber of the burner by the high temperature gas in the furnace. Preheating can help devolatilization and promote combustion of anthracite. In this year, IHI's low volatile fuel burner was installed to an existing boiler in Vietnam, which capacity is 100 t/h. This boiler is opposed firing with four burners and water tubes in burner zone are covered with refractory to increase the temperature around the burners. Only one burner was changed to IHI's low volatile fuel burner and demonstration test of anthracite firing was conducted. As the result of test, anthracite firing succeeded in the boiler to which IHI's low volatile fuel burner was installed. In this paper, the result of this demonstration test will be introduced. The improvement of the burner for anthracite combustion will be discussed.
