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在50kW循环流化床试验装置上进行空气燃烧和氧/烟气循环燃烧实验,考察不同燃烧方式下煤燃烧和污染物排放特性。结果表明,氧切换过程中密相区温度由空气燃烧时的880℃降低到了O_2/CO_2燃烧时的810℃,但随着氧气浓度上升,密相区温度迅速恢复到了空气燃烧时的水平。O_2/CO_2燃烧方式下,烟气中CO_2浓度可达到93%(干基);Ca/S摩尔比为4时,脱硫效率是88.5%;氮氧化物的排放量是24 mg/MJ,比空气燃烧时的105 mg/MJ大大减少;CO的排放量比空气燃烧时略低。
Air combustion and oxygen / flue gas cycle combustion experiments were conducted on a 50kW circulating fluidized bed test device to investigate the characteristics of coal combustion and pollutant emission under different combustion modes. The results show that the temperature in the dense zone decreases from 880 ℃ during air combustion to 810 ℃ during O_2 / CO 2 combustion. However, with the increase of oxygen concentration, the temperature in dense zone rapidly returns to the level of air combustion. In the O 2 / CO 2 combustion mode, the concentration of CO 2 in the flue gas can reach 93% (dry basis); when Ca / S molar ratio is 4, the desulfurization efficiency is 88.5%; the nitrogen oxide emission is 24 mg / MJ, 105 mg / MJ at combustion was significantly reduced; CO emissions were slightly lower than at air combustion.