| 英文摘要 |
A combination of work in monitoring, modeling, and flare flow rates from Taiwan CPC Tao-Yuan Oil Refinery facility has been analyzed for the period from April 2014 to April 2016. These data show that the controls of the flare emissions, started in end of 2013, have produced a direct impact on the percentage occurrence of monitored H2S concentrations higher than 2 ppbv. The most significant effect of the 2013 flare flow-rate reductions can be seen on the percentage occurrence of H2S higher than 10 ppbv, which has reduced from 4% in 2013 to below 1% since January 2014. A brief period of increases in the percentage occurrence of H2S concentrations between 2 ppbv and 8 ppbv had occurred in the end of 2014, consistent with the increases of flow rates from hydrocarbon (HC)-burning ground flares number 2, 3, and 4 during this period. Hence, the increase of percentage occurrence of H2S concentrations between 2 ppbv and 8 ppbv were associated with the increases in the ground-level HC flare flow rates during the end of 2014. The flow rates of the ground-level HC flares have been reduced further since January 2015, resulting in a significant reduction of percentage occurrence for H2S greater than 6 ppbv. The operation of the flare gases recovery system (FGRS) since January 2016 has also produced an impact on the reduction of the percentage occurrence of H2S higher than 2 ppbv. The most significant impact of the FGRS system is seen from the reduction of the percentage occurrence of H2S higher than 6 ppbv.
Following is a list of conclusions from this work:
1.The monthly data from flares have indicated 3 major periods of significant reductions of flow rates for flares:
(1)The reduction to nearly zero flow rates for elevated H2S flare number 4 since end of 2013;
(2)Reductions of flare flow rates for the ground-level HC flares since January 2015;
(3)The operation of the FGRS flare emission control system since January 2016;
2.The ambient air monitoring data for H2S indicates significant changes of the percentage occurrence of H2S concentrations, specifically,
(1)The reduction of flow rates for elevated H2S flare number 4 are consistent with the reduction of percentage occurrence of H2S higher than 10 ppbv since end of 2013;
(2)The reduction of flow rates for ground-level HC flares are consistent with the reduction of the percentage occurrence of H2S higher than 6 ppbv since January 2015;
(3)The operation of the FGRS are consistent with the reduction of the percentage occurrence of H2S higher than 2 ppbv since January 2016;
3.Hence, our monitoring and modeling work has proved the effectiveness of the emission control processes from flares.
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