Mortality related to primary bariatric surgery in England

Abstract

A new down-fired combustion technology based on multiple-injection and multiple-staging was previously developed for a down-fired 350 MWeutility boiler suffering from severely asymmetric combustion and particularly high NOxemissions. To evaluate its furnace performance with respect to the new technology, coal combustion process and NOxformation within the furnace were numerically investigated at four settings (i.e., air stoichiometric ratios in the primary combustion zone (SRp) of 1.02, 0.96, 0.90, and 0.84, respectively). Numerical results uncovered that with the new technology replacing the prior art, asymmetric combustion removals and significant NOxreductions (nearby 50%) were validated for all four settings. With decreasing SRP, both gas temperature at the furnace outlet and O2in flue gas decrease continuously, carbon in fly ash generally increases, while NOxemissions decrease initially but then increase. In considering relatively appropriate values established simultaneously in gas temperature at the furnace outlet, O2in flue gas, carbon in fly ash, and NOxemissions when SRp= 0.96 and 0.90, the optimum operation condition for the furnace after a retrofit with the technology was recommended at SRp= 0.90–0.96.