煤焦化生产过程甲烷排放初步研究

A Preliminary Study of Methane Emission from Coal Coking Process

本研究选取山西省具有代表性的焦化厂,通过在废气排放烟囱上采集燃烧室废气和装煤/出焦废气,初步研究了煤焦化过程甲烷排放特征。结果显示燃烧室废气中CH4占∑(CH4+NMHC)的比例远高于装煤和出焦废气。基于EPA AP-42排放因子的计算方法,煤焦化三个工段的CH4排放因子为228.5±56.1g/t。结合中国机械炼焦炉焦炭产量,2004年中国机械炼焦CH4排放为0.03Tg/a,占中国总CH4排放的0.1%,可能是山西省除煤炭开采外的重要甲烷排放源,该值还需再进一步的工作中完善和验证。

In this study, methane emission was monitored in a typical coking plant by sampling stack gas from the coke oven furnace and the operations of loading coke coal and quenching hot coke. The results showed that the percentage of methane in ∑（CH4＋NMHC） from the stack gas in the coke oven furnace was higher than that emitted by loading and quenching. Based on the rule in AP-42 edited by USEPA, the methane emission factor （EF） for these three processes was 228.5±56. lg per coke produced. And methane emission was estimated at 0.03Tg by the EF and the out of Chinese coke output, which was less than 0. 1% of the total methane emission in China, but may be the important emission source in Shanxi province except for coal mining. This research should be consummate and verify in the future work.