Abstract：This research was performed in a typical steelmaking enterprise, which contained entire process of steel refining. Different methods were applied to estimate the VOCs emission account and the VOCs exhaust concentrations derived from sintering, coking, hot rolling and cold rolling processes were detected by using Teflon/SUMMA canister+GC-FID/MS. The annual VOC emissions from this enterprise were 430.82t in total, 66.0% from controlled emission, and 18.5% from storage tanks. The VOCs concentrations from sintering head and coke pushing outlet were higher than other places. The aromatic hydrocarbons in each process account for a relatively high proportion, which contributed more than 90% in the controlled emission of coking process. The CS2 exhaust in sintering process was the highest (36.6%), followed by benzene and toluene. The main VOC species in the coking process were 1,2,4-trimethylbenzene, o-ethylbenzene, 1,4-diethylbenzene, 1,2,3-trimethylbenzene and 1,3,5-trimethylbenzene. There were some differences between the hot rolling process and other processes. Aromatics and alkanes emitted from the workshop uncontrolled sources accounted for around 35% respectively. Except the aromatics, high-carbon alkanes such as undecane, dodecane and n-butane were also high emission species. The main VOC species emitted from cold rolling process were similar in controlled and uncontrolled sources, much of them were aromatics, such as ethylbenzene, m-xylene, toluene, benzene and o-xylene. Although, there were some different VOC species detected from different processes, but the main emissions were though coking (aromatic hydrocarbons) and sintering (CS2). Therefore, we suggested that the high concentration, high activity and high toxicity VOCs should be well controlled in steel manufacturing industry.
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