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NO, reduction, but less effective for NzO reduction; the optimum value of the ratio of primary/ total air was -0.8 for minimizing NO, emissions. Limestone injection at calcium-sulfur molar ratios >2:1 made it possible to remove >90% of SOz formed, although two-stage combustion and decreased concentration of in-bed oxygen brought about a decrease in SOz removal efficiency.
Consequently, using a two-stage combustion scheme, lignite can be burned at fairly low levels of NO,, NzO, and SOz emissions when limestone is added into fluidized-bed combustor. 96lo4004 Combustion characteristics and growth of carbon deposited on a coke-oven wall Kim, K.-H. and Lee, Y.-K. Hwnhak Konghak, 1997, 35, (6), 863-869. (In Korean)
This study attempts to understand the growth of carbon and combustion characteristics and estimate the quantity of carbon deposited on the coke oven ,wall. The growth mechanism of deposited carbon sampled in the different positions of coking chamber was examined. A nuclei test product was produced from the condensation of pulverized coal and tar vapour and then it was grown by pyrolysis, resulting in carbon formation.
A small carbonization oven was used to predict the deposition rate of carbon. It was assumed that the carbon deposition in coke oven wall carbonizing about 33 tons coal was 4.56 kg and the capacity of fan supplying air for combustion was over 70 Nm"/min.
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