1、 I 1025t/h 锅炉炉膛变气氛热力计算 摘要 O2/CO2燃烧技术是减少二氧化碳排放的一种行之有效的方法。本文首先简单介绍了 O2/CO2燃烧技术的特点,以及其国内外的研究现状。然后对某蒸发量为 1025t/h 的锅炉在 空气和在不同比例下的 O2/CO2气氛中燃烧进行了炉膛热力计算, 并对计算结果进行了比较。 计算的结果表明, 采用O2/CO2燃烧技术后, 三原子气体(主要是CO2)体积份额大幅度增加, 使炉膛内的辐射换热有所增强;煤粉在 O2/CO2为 30/70 的气氛中燃烧时,其炉膛中的各项 参数都与在空气中燃烧时相近; 煤粉在 O2/CO2气氛中燃烧能有效地提高锅炉的热效率;
2、当 O2的比例大于 30%时,理论燃烧温度和炉内总传热量都随着 O2份额的增加而升高;对常 规空气下燃烧的电站锅炉进行适当整改后, 可以适应 O2/CO2这种燃烧技术, 如将尾部烟道 的一部分对流换热面移到炉膛内,增加炉膛内的换热面积,使其吸收所增加的炉内传热量 等。 关键词:O2/CO2燃烧技术;煤粉燃烧;锅炉;热力计算 II The thermal calculation of 1025 t/h boiler in changed atmosphere Abstract Oxy-fuel combustion technology is an effective kind of metho
3、d to reduce emissions of carbon dioxide.A brief introduction to the characteristics of O2/CO2 combustion technology and the research at home and abroad.One evaporation capacity for 1025 t/h boiler under different O2/CO2 ratios have been calculated,and compared with that in air atmosphere condition.
4、The calculation results show that the volume fraction of the triatomic gases (mainly CO2) significantly increased will enhance the radiation heat transfer within the furnace.The calculation outcome of combustion under the O2 /CO2 ratio of 30 /70 is close to that of combustion in air,and pulverized coal combustion in O2/CO2 atmosphere can improve the thermal efficiency of the boiler. When O2 ratio greater than 30%, theoretical combustion temperature and the total furnace heat transfer is increas