煤粉燃烧过程中矿物质气化影响因素的模拟研究

鉴于目前国内的实验设备和测量手段，精确测量煤燃烧过程中各种矿物质的气化率还存在很大困难。该文通过建立煤中矿物质气化的数学模型，针对煤中SiO2和FeO两种成分，来探讨相关因素对它们气化率的影响，最后应用CFD软件来研究它们在600MW锅炉内的气化行为。计算结果表明：温度是煤中SiO2和FeO气化的主要影响因素，煤粒粒径和CO2浓度也会对它们有一定影响。通过与实验结果的比较，表明计算结果比较合理。

NUNERICAL SIMULATION OF INFLUENCE FACTORS ON MINERAL MATTER VAPORIZATION DURING PULVERIZED COAL COMBUSTION

Based on the currently available test devices and measuring methods, it is quit difficult to accurately measure the vaporization rate of mineral matter in coal combustion process.A mathematic model was developed to predict the vaporization rate of mineral matter in this paper. The effect of CO2 partial pressure, temperature and size of coal particles on the vaporization rate of mineral matter was considered in the model.The vaporization behavior of the mineral matter in a 600MWe coal-fired utility boiler furnace was simulated. The results showed that the coal particle temperature is a main factor affecting the mineral matter vaporization, while the coal particle size and CO2 partial pressure also have an effect on vaporization. The mineral matter vaporization occurred primarily along the particle trajectories after a short time when the particle temperature reached 1800K. The comparison of the simulation results with experimental data showed that the modeling results are in good accordance with the laboratory measurements.