Sorbent/urea slurry injection for simultaneous SO2/NOx removal

✍ Scribed by Gullett, Brian K. ;Bruce, Kevin R. ;Hansen, Walter F. ;Hofmann, John E.

• Publisher: American Institute of Chemical Engineers
• Year: 1992
• Tongue: English
• Weight: 758 KB
• Volume: 11
• Category: Article
• ISSN: 0278-4491
• DOI: 10.1002/ep.670110225

✦ Synopsis

The combination of sorbent injcction and selective noncatalytic reduction (SNCR) technologies has been investigated for simultaneous S021N0.t removal. A slurry composed of a urea-bused solution and various Ca-based sorbents was injected at a range of temperatures and reac~tuntlpollutant stoichiometries. Testing on a natural gas pilot-scale reactor with doped pollutants achieved up to 80% reduction of SO, and NO,, at reactuntlpollutant stoichiometric ratios of 2 and I , respectively. SO, emission reductions from slurrj injection were enhanced compared with dry Ca(OH), sorbent injection methods possibly due to sorbent fracturing to smaller, more reactive particles. Emissions from NH, slip and N,O formation were reduced in comparison with others' published results while similar NO, reductions were obtained. The injection of the urea-based solution enhanced the SO, removal, likely due to the formation of a (NH,),CU(SO,)~~H,O compound. The results qf this pilot scale study have shown high reduction of both SO, and NOy, suggesting the need for full scale studies to further assess this combined sorbentlurea-based slurry injection technology.