36. The Fundamental Studies on Combustion of Sintering Flue Gas in Circulating Fluidized Bed

The development of sintering flue gas circulating fluidized bed (CFB) treatment technology is very important because there are many disadvantages in the existing treatment technology. In order to understand this technology, it is necessary to study the combustion of sintering flue gas in a circulating fluidized bed. Experiments were performed to study the combustion characteristics of Zuoyun bituminous coal in this oxygen-deficient atmosphere by a large-capacity TGA (LC-TGA). By changing reaction parameters, the influence of combustion temperature and gas atmosphere on coal combustion were analyzed. The experimental results confirm that the change of oxygen concentration and combustion temperature will greatly affect the combustion of coal in the low oxygen atmosphere. With the increase of oxygen mole fraction and combustion temperature, the combustion rate of coal will gradually accelerate. The presence of CO in the combustion atmosphere will not change this trend, but it does greatly affect the combustion characteristics of coal, which is particularly evident at 800 and 850 ℃. CO has obvious oxygen-grabbing behavior at high temperature, and the influence on coal combustion seems to be closely related to the temperature. The present experimental results will provide the reference for the further development of sintering flue gas circulating fluidized bed technology.