稀缺高炉喷吹用煤地质评价指标探讨及应用

高炉喷吹用煤可减少焦炭的使用量,是现代高炉降低生产成本提高经济效益的重要技术措施。从高炉喷吹用煤的煤质影响因素入手,在稀缺煤和优质煤煤质评价的基础上探讨稀缺高炉喷吹用煤的地质评价指标及分级参数。通过分析,将高炉喷吹原料用煤的煤质评价指标划分为工艺指标和经济指标两大类,工艺指标是决定煤是否能用于高炉喷吹工艺的关键指标,经济指标主要影响高炉喷吹工艺的成本。煤类差异是高炉喷吹用煤选择的首要因素,根据我国煤炭资源禀赋特征,提出无烟煤、贫煤、贫瘦煤是高炉喷吹用煤中的稀缺煤类。结合煤炭地质勘查中对"优质煤"的评价标准,提出灰、硫、磷的含量是稀缺高炉喷吹用煤地质评价的关键指标,要求灰分质量分数不大于12.00%、全硫质量分数不大于1.00%、磷分质量分数不大于0.03%。利用该指标对我国无烟煤、贫煤、贫瘦煤分布的典型矿区进行煤质评价和资源划分,指出永城、西山、阳泉、潞安、二道岭和汝箕沟矿区是我国稀缺高炉喷吹用煤的主要分布区,统计的稀缺高炉喷吹用煤保有资源量107亿t,为我国稀缺高炉喷吹用煤的合理开采和充分利用提供了依据。

Discussion and application of geological evaluation index of scarce coal injected into blast furnace

Coal injected into blast furnace can reduce the use of coke, is an important technical measure to reduce the production cost and improve the economic benefit of modern blast furnace. From the influential factors of quality of coal injected into blast furnace and on the basis of evaluation of quality of high-quality coal and scarce coal, the geological evaluation indexes and the grading parameters of scarce coal injected into blast furnace were discussed. The evaluation indexes of coal quality for blast furnace are divided into process index and economic index. Process index is the key index to determine whether coal can be used in blast furnace injection process. Economic index mainly affects the cost of blast furnace injection process. According to the characteristics of coal resources in China, anthracite, lean coal and meager-lean coal are the rare coal for blast furnace. Combined with the evaluation standard of "high quality coal" in coal geological exploration, it is proposed that ash, sulfur and phosphorus are the key indexes for geological evaluation of scarce coal for blast furnace, it is required that the ash mass fraction is less than 12.00%, the total sulfur mass fraction less than 1.00% and the phosphor mass fraction less than 0.03%. Using these indexes, the coal quality evaluation and resource division of typical mining areas of anthracite, lean coal and meager-lean coal in China are carried out. It is proposed that Yongcheng, Xishan, Yangquan, Lu'an, Erdaoling and Rujigou mining areas are the main distribution areas of scarce blast furnace coal, and the remaining resources of scarce blast furnace coal are 10.7 billion tons. It provides a basis for the rational exploitation and full utilization of the coal injected into blast furnace in China.