Bench and Pilot-Scale Characterization of Low Temperature Selective Catalytic Reduction of NOx

Conference on Selective Catalytic and Non-Catalytic Reduction for NOx Control

T. K. Anand, M. Vittal ; A. L. Boehman

Others  :  http://www.netl.doe.gov/publications/proceedings/97/97ncr/boehman.pdf
PID  :  48087

来源: CEUR

【 摘 要 】

The objective of this work is to develop a strategy for low temperature NOx and SOxcontrol.To achievethis control, dry sorbent and ammonia are to be injected into coal boiler flue gas upstream of a conventional low temperature baghouse with catalyzed monoliths placed within the filter bags.To this end, the present study has characterized the activity and selectivity of a commercial low temperature NOx reduction catalyst using ammonia as the reductant.Tests were performed in a bench-scale, fixed-bed reactor using monolith supported catalysts to cover a range of feedstream conditions that are representative of industrial-scale coal-fired boilers.Synthetic flue gas mixtures at temperatures of 160 to 350_C were passed through a catalyzed monolith while the inlet and exit gas compositions were quantitatively analyzed using an FTIR spectrometer, which allowed both the activity and selectivity of the catalyst to be monitored.The measurements show that activity peaks at nearly 90% NO conversion between 240 and 300_C, while selectivity (to N2 ) peaks at nearly 98% between 150 and 200_C.Similar results were obtained when the catalyst was tested on a pilot-scale combustor (0.5 MMBtu/h) fired on natural gas.[First Paragraph]