455581 Air-Quality Conscious Study for Multiple Olefin Plants' Turnaround Operations

Tuesday, November 15, 2016: 9:45 AM
Union Square 14 (Hilton San Francisco Union Square)
Sijie Ge1, Sujing Wang2, Qiang Xu1 and Thomas C. Ho1, (1)Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX, (2)Department of Computer Science, Lamar University, Beaumont, TX

Ground-level ozone is a pervasive air pollutant, which can be potentially elevated by flaring emissions during turnaround operations (e.g., shut-down or start-up) of chemical plants. Especially in chemical plant concentrated regions, the local ozone concentration can be aggravated by simultaneous start-up and shut-down operations. Thus, it is environmentally and cost-effective important for study on multiple plant turnaround operations under allowable manufacturing constraints to minimize the induced potential adverse air-quality impact. In this paper, a systematic methodology on air-quality conscious study for multi-plant turnaround operations has been developed. Through case studies, it demonstrates that multi-plant turnarounds without any coordination could result in the worst air quality impact (i.e., 11.4 ppb of maximum 8-hour ozone increment); however, the optimal scheduling plan with several-hour difference tuning on their turnaround starting time would significantly reduce such impact (only 1.4 ppb of maximum 8-hour ozone increment). The study couples process-level dynamic simulation for flare emissions with regional-level air-quality modeling together; and explores cost-effective and environmentally benign air-quality control strategies. It provides valuable quantitative supports for relevant stakeholders, including environmental agencies, regional plants, and local communities.

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See more of this Session: Atmospheric Chemistry and Physics
See more of this Group/Topical: Environmental Division