摘要
以300MW燃煤锅炉汽轮发电机组为研究对象,计算了其在6～8MPa压力下增压富氧燃烧的经济性,并与常压富氧燃烧下的经济性进行了对比分析.结果表明:由于系统压力的提高,烟气中水蒸气的凝结热得以回收,用于加热汽轮机低温凝结水,减少汽轮机抽汽,使汽轮机出力增加,电厂的毛输出功率接近320MW;增压富氧燃烧的空气深冷分离制氧(ASU)功耗大大增加,占毛输出功率的26%,而烟气压缩(CPU)的功耗大大降低,约为毛输出功率的0.2%;综合考虑电站其他辅机功耗后,6～8MPa下增压富氧燃烧的电厂净效率比常压富氧燃烧下提高了4.5%.与常压富氧燃烧发电机组相比,增压富氧燃烧在CO2的捕集、压缩液化与封存(CCS)技术中的经济性明显提高.
Taking the 300 MW sub-critical turbine-generator unit as an object of study, an economic calcu lation was carried out for the unit with 6-8 MPa pressurized oxy-fuel combustion, of which the result was compared with that of the atmospheric oxy-fuel combustion. Results show that under pressurized oxy-fuel combustion condition, the gross unit power output reaches 320 MW due to the increased systematic pressure, the recovered latent heat in flue gas steam, which is to be used to heat low-temperature condensate ,and the increased turbine output resulted from reduced steam extraction; the power consumption of air separation unit rises greatly, accounting for about 26% of the gross power, and that of the purification and compression unit reduces sharply, accounting for about 0.2 % of the gross power; considering other auxiliary power consumptions, the overall net efficiency of unit with 6-8 MPa pressurized oxy-fuel combustion may be improved by 4.5 %, compared with that of the atmospheric oxy-fuel combustion, indicating obvious economical effect in the application of carbon capture and storage technology.
出处
《动力工程学报》
CAS
CSCD
北大核心
2012年第9期712-717,共6页
Journal of Chinese Society of Power Engineering
基金
国家高技术研究发展863计划专项经费资助项目(2009AA05Z310)
关键词
常压富氧燃烧
增压富氧燃烧
CO2捕集
经济性
毛功率
净效率
atmospheric oxy-fuel combustion
pressurized oxy-fuel combustion
CO2 capture
economy
gross power
net efficiency
