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Hazard control of NOxis very important for the long life of hot stove shell and environmental protection.NOxconcentrations during different operation periods of hot stove were calculated according to thermodynamical and dynamical analyses.The results were verified by the previously measured data.Then,the influence of hot stove operation parameters on NOxconcentration and the mechanism of liquid water formation in hot stove were studied.The results indicated that in gas period,the dome temperature should be controlled below 1 420 ℃in order to decrease NOxemission.In the case of banking operation,NOxconcentration was about 40-60times higher than that in gas period.Hence,reasonable measures should be taken to reduce banking operation,especially in the situation of large excess air ratio.Since NOxformed during the whole operation process,the most effective way of preventing liquid water and HNO3generation is to control the pipe and shell temperature,which should be higher than the condensation temperature of water vapour.The condensation temperature should be considered as the design temperature of pipe and shell for hot stove.
Hazard control of NOxis very important for the long life of hot stove shell and environmental protection. NOxconcentrations during different operation periods of hot stove were calculated according to thermodynamical and dynamical analyzes. The results were verified by the previously measured data. hot stove operation parameters on NOxconcentration and the mechanism of liquid water formation in hot stove were studied.The results indicated that in gas period, the dome temperature should be controlled below 1 420 ℃ in order to decrease NOxemission. In the case of banking operation, NOxconcentration was about 40-60times higher than that in gas period.ence, reasonable measures should be taken to reduce banking operation, especially in the situation of large excess air ratio.Since NOxformed during the whole operation process, the most effective way of preventing liquid water and HNO3 generation is to control the pipe and shell temperature, which should be higher than the conden sation temperature of water vapor. the condensation temperature should be considered as the design temperature of pipe and shell for hot stove.