1. The increasing of material circulation quantity will bring down the theoretical combustion temperature, especially when the circulating materials is at low temperature.
2. Due to the recycling of solid materials, the residence time of fuel in the boiler is increased, which makes high combustion efficiency.
3. The material circulation makes the whole combustion temperature tend to uniform, and reduce the temperature of the combustion chamber accordingly, in this way, the desulfurization and denitration can be controlled at the optimum reaction temperature, but for combustion, the reaction speed is reduced, the combustion is in a dynamic condition.(lsh)