Application Of Modified Coke To No_x Reduction With Recycling Flue Gas During Iron Ore Sintering Process

摘要

A new process, named NO_X reduction by the modified coke with recycling flue gas, was proposed. The coke samples loaded with K_2CO_3, CaO and CeO_2 were characterized by SEM. The effects of the recycled flue gas and the modified coke on NO_X reduction were investigated with a quartz fixed bed reactor and a sintering pot. The results showed that the extent of the contact between additives and coke was: K_2CO_3>CaO>CeO_2. In the modified coke combustion with recycling flue gas, the concentration of NO_X emission was decreased, furthermore, the NO_X reduction ratio increased with the loading amount of additives. The NO_X reduction ratios were 36.7%, 20.2% and 26.2% respectively when the loading amount of K_2CO_3, CaO and CeO_2 was 2.0%. In sintering pot tests, the coke loaded with 2.0% CeO_2 was used as fuel and the recycled flue gas, simulated by the gas mixture with 50 ppm NO, was introduced to sintering process, the NO_X reduction ratio was 38.0%, which was about 13% higher than that of the base run with recycling flue gas.