Experimental study of NO(sub x) recycle in the NOXSO flue gas cleanup process. Final report

摘要

NOx recycle can remove 90% of NOx and SO2 simultaneously from flue gas by using a fluidized bed of sorbent. Spent sorbent is regenerated by treatment at high temperatures with a reducing gas. Adsorbed NOx is evolved on heating the sorbent to a regeneration temperature. The concentrated stream of NOx produced is returned to the boiler with the combustion air and reduced in the flame, which is called NOx recycle. NOx destruction has been demonstrated on a 500 lb/hr pulverized coal combustor and a 1.7 MMBtu/hr tunnel furnace combustor firing both natural gas and coal-water slurry. The NOx recycle experimental study discussed in this report and performed on Babcock & Wilcox (B&W)'s six MMBtu/hr Small Boiler Simulator (SBS) is a pilot-scale test. The objective is to provide further fundamental understanding and necessary information for the NOXSO full-scale demonstration at Ohio Edison's Niles Power Plant which uses the same type of cyclone burners. The experimental testing included injection of NO, NOx, and different combinations of NO/NO2 with tile primary air (PA) and secondary air (SA) to the combustor. Results are consistent with earlier test data obtained on PETC's facility and will be used for the design of the NOXSO commercial demonstration plant at Niles.