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SCR performance on a hydrogen reformer furnace
1Environmental, Health and Safety Department, Air Products and Chemicals, Inc., Allentown, Pennsylvania 18195-1501, USA.
Journal of the Air & Waste Management Association (1995)
|January 20, 2005
Summary
Selective Catalytic Reduction (SCR) effectively reduces nitrogen oxides (NOx) emissions in refinery settings. This technology demonstrates high NOx removal efficiency and compliance with environmental regulations.
Area of Science:
- Chemical Engineering
- Environmental Science
- Catalysis
Background:
- Refinery operations require effective emission control technologies.
- Selective Catalytic Reduction (SCR) is a proven method for reducing nitrogen oxides (NOx).
- Limited documented experience of SCR in refinery environments existed prior to this study.
Purpose of the Study:
- To evaluate the performance of an SCR unit in a refinery setting.
- To analyze the relationship between system variables and SCR performance.
- To assess compliance with environmental permit limits for emissions.
Main Methods:
- Installation and operation of an SCR unit on reformer-furnace flue gas.
- Monitoring of nitrogen oxides (NOx), ammonia (NH3) slip, and carbon monoxide (CO) emissions.
- Analysis of SCR performance data over the first two years of operation.
Main Results:
- NOx, NH3 slip, and CO emissions remained within permit limits.
- NOx removal efficiency correlated linearly with the ammonia (NH3) to NOx molar ratio.
- High NOx conversion was achieved before a steep increase in ammonia slip.
Conclusions:
- SCR technology is effective for controlling refinery emissions.
- Optimal performance is achieved near a stoichiometric NH3:NOx ratio of 1.0.
- The SCR catalyst is projected to have a lifespan of approximately four years.