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建立了直吹管-风口-回旋区下部区域内气固流动、传热和煤粉燃烧的数学模型,基于实际高炉工艺参数,借助商业软件通过数值模拟的方法研究了煤粉粒度、鼓风含氧量和鼓风温度对煤粉燃尽率的影响.结果表明,煤粉粒径由120μm降低到70μm,燃尽率提高35.928%;鼓风含氧量由21%增加到30%,燃尽率上升16.542%;而鼓风温度由1423 K增加到1498 K,燃尽率仅提高8.897%.脱挥发分过程和氧气供应是决定燃尽率高低的两大因素.此外,在研究变量对喷吹煤粉燃尽率的影响时,模拟区域应同时包含直吹管、风口和回旋区.
The mathematical model of gas-solid flow, heat transfer and pulverized coal combustion in the area of the straight blow pipe tuyere and convolution zone was established. Based on the actual blast furnace process parameters, the particle size, The results show that the particle size of pulverized coal decreases from 120μm to 70μm, the burnout rate increases by 35.928%, the blast oxygen content increases from 21% to 30%, and the burnout rate Increased by 16.542%, while the blast temperature increased from 1423 K to 1498 K, the burnout rate increased by only 8.897% .Devolatilization and oxygen supply were the two major factors that determine the burnout rate.In addition, Pulverized coal burnout rate of impact, the simulation area should also include a straight blow pipe, tuyere and convolution area.