Boiler Combustion Theory
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The stage from the fuel into the furnace to the ignition temperature is called the preparation stage. In this stage, the evaporation of water should be completed, the volatile matter should be separated out, and the mixture of fuel and air should reach the ignition temperature. Obviously, this stage is the endothermic process, and the source of heat is flame radiation and high-temperature flue gas backflow. In addition to the burner itself, the factors that affect the length of the preparation stage are the strength of the heat provided by the hot flue gas in the furnace for the pulverized coal flow, the amount, temperature, concentration, volatile content and fineness of the pulverized coal flow.[link text](
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When the ignition temperature is reached, the volatile matter is first ignited and burned, releasing heat to increase the temperature, and the coke is heated to a higher temperature and begins to burn. The combustion stage is a strong exothermic process, the temperature rises rapidly, and the chemical reaction is strong. At this time, the surface of the carbon particles often appears in an oxygen-deficient state. The key to the enhanced combustion stage is to strengthen the mixing, so that the air flow is strongly disturbed, so as to provide oxygen to the surface of the carbon particles, and diffuse the carbon dioxide on the surface of the carbon particles.[link text](
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