(42b) Air-Quality Conscious Scheduling for Multiple Olefin Plant Start-Ups
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2016
- Proceeding: 2016 AIChE Spring Meeting and 12th Global Congress on Process Safety
- Group: Environmental Division
- Time: Monday, April 11, 2016 - 3:55pm-4:20pm
The ground-level ozone is a pervasive air pollutant, which can be formed from flare emissions during chemical plant start-up operations. Especially in the concentrated industrial areas, the regional air quality (i.e., the ozone concentration) might be aggravated by simultaneously start-up emissions from multiple chemical plants. Thus, it is environmentally important for optimal scheduling of multi-plant start-ups under their manufacturing allowances to minimize the possible adverse air-quality impact. A systematic methodology on air-quality conscious scheduling for multi-plant start-ups has been developed. It demonstrates that multi-plant start-ups without any coordination could result in the significant air-quality impact. However, an optimal scheduling plan with several-hour tuning on the starting time of their start-up operations would significantly reduce about 80 % ozone increment. The study couples process dynamic simulation for industrial flare emissions with regional air-quality modeling together. It can provide valuable and quantitative supports for all relevant stakeholders, including environmental agencies, regional plants, and local communities.