钢铁企业烧结工序烟粉尘排放的测试与评价

对某钢铁企业烧结工序不同烟粉尘排放源的现场采样,包括烧结煤粉破碎、烧结配料、烧结机头、烧结机尾和烧结矿成品筛分等工艺过程.测试了各工艺过程的除尘灰以及排放烟粉尘的粒径分布和化学组成,分析得出除尘前烟粉尘的粒径分布和化学组成.在此基础上,建立了烧结工序各个烟粉尘排放点的综合评价指标.通过专家调研得出了各个评价指标的权重集,最终运用模糊综合评判法,对烧结工序各个烟粉尘排放点进行综合评价,得出烧结工序的重点烟粉尘排放点.结果表明,烧结机头的TSP排放总量、PM_(2.5)质量分数、PM_(10)质量分数和重金属元素质量分数均为最大,是烧结工序最重要的烟粉尘排放点.

Test and Evaluation of Dust Emissions During Sintering Process in an Iron and Steel Enterprise

The particulate matter size distribution and chemical element of particles both emitted and collected by precipitators from different processes， including coal broken， ingredient， sintering machine head， sintering machine tail and product screening of sintering process，were measured in site of an iron and steel enterprise. Based on the test results， the comprehensive evaluation index in each dust emission point of the sintering process were established. The weight of each evaluation index was obtained from experts. Then， each dust emission point was evaluated by the method of fuzzy comprehensive evaluation. The results showed that the sintering machine head is the most important dust emission point with the most emission quantity and the highest mass fraction of PM_2.5， PM₁₀ and heavy metals.