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Experimental Study on NO_x Emission from Coal Combustion Under O_2/CO_2 Atmosphere

Xiaobo Zhou

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Abstract

The NO_x emission characteristics during the pulverized coal combustion process were tested in the tube type resistance furnace under O_2/CO_2 and 02/N2 atmospheres.The effects of resistance time,fuel/oxygen stoichometric,temperature and oxygen concentration on NO_x emission were investigated.The NO_x emission characteristics under two atmospheres were compared.The results show that the released NO_x is much lower in O_2/CO_2 atmosphere than in air.With the residence increase,NO_x mission concentrations increase before 2 second, and then begin to decrease.With the excessive air ratio increase,NO_x mission concentrations increase in fuel rich region,and then appear to decrease in fuel lean region.With the increasing of combustion temperature,NO_x mission concentrations always increase.As the oxygen concentration increased,NO_x emissions concentration increase.

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What this paper is about

The NO_x emission characteristics during the pulverized coal combustion process were tested in the tube type resistance furnace under O_2/CO_2 and 02/N2 atmospheres.The effects of resistance time,fuel/oxygen stoichometric,temperature and oxygen concentration on NO_x emission were investigated.The NO_x emission characteristics under two atmospheres were compared.The results show that the released NO_x is much lower in O_2/CO_2 atmosphere than in air.With the residence increase,NO_x mission concentrations increase before 2 second, and then begin to decrease.With the excessive air ratio increase,NO_x mission concentrations increase in fuel rich region,and then appear to decrease in fuel lean region.With the increasing of combustion temperature,NO_x mission concentrations always increase.As the oxygen concentration increased,NO_x emissions concentration increase.

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Available abstract

The NO_x emission characteristics during the pulverized coal combustion process were tested in the tube type resistance furnace under O_2/CO_2 and 02/N2 atmospheres.The effects of resistance time,fuel/oxygen stoichometric,temperature and oxygen concentration on NO_x emission were investigated.The NO_x emission characteristics under two atmospheres were compared.The results show that the released NO_x is much lower in O_2/CO_2 atmosphere than in air.With the residence increase,NO_x mission concentrations increase before 2 second, and then begin to decrease.With the excessive air ratio increase,NO_x mission concentrations increase in fuel rich region,and then appear to decrease in fuel lean region.With the increasing of combustion temperature,NO_x mission concentrations always increase.As the oxygen concentration increased,NO_x emissions concentration increase.

Key concepts: Combustion, Atmosphere (unit), Tube furnace, Oxygen, Coal, Limiting oxygen concentration, Pulverized coal-fired boiler, Chemistry

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Experimental Study on NO_x Emission from Coal Combustion Under O_2/CO_2 Atmosphere — Research Paper | ScholarLens