摘要
碳捕集和封存是实现电力低碳化发展的关键所在,建立太阳能辅助碳捕集系统与燃煤机组的耦合系统,构建耦合系统的热经济学优化模型,研究碳捕集机组的热经济性。构建碳捕集机组的生命周期评价体系,研究燃煤机组和碳捕集机组建设、运行、退役等各阶段的CO_2排放特性,对比分析其对环境的影响特性。结果表明:脱碳率为85%,吸收剂质量分数为30%时,解吸能耗为4.5 GJ/tCO_2,碳捕集机组优化前后的热效率分别为38.2%和39.3%。燃煤机组电厂运行阶段碳排放量所占比重约为99.4%,电厂建造、煤炭运输及电厂退役等阶段排放的CO_2比重约为0.6%。碳捕集系统建造、运行和退役增加的CO_2排放量为56.314 t/h,占耦合系统全生命周期排放总量的58.01%,减排率约为52.65%。碳捕集机组和太阳能辅助碳捕集机组中CO_2的排放由原燃煤机组的3.63×10^(-5)标准当量降低为1.72×10^(-5)和0.98×10^(-5)标准当量。燃煤机组、碳捕集机组和太阳能辅助碳捕集机组中,酸化对环境的贡献分别为1.5×10^(-6)标准当量和1.9×10^(-6)和1.0×10^(-6)标准当量,固体废弃物对环境的贡献分别为2.76×10^(-5)标准当量和3.52×10^(-5)和1.97×10^(-5)标准当量。
Carbon dioxide capture and storage(CCS)is a technology to reduce carbon emission and the key to develop low-carbon power. This study has established an environment-friendly coupling system of solar aided coal-fired unit with carbon capture. The optimization model for thermal economics of the coupling system is successfully constructed,which aims at researching thermal-economy of the coupling system. Meanwhile it is effective to apply life cycle assessment(LCA) to CCS unit,with the purpose to analyse the CO2 emitted from carbon capture unit during the stages of construction,operation and retirement. Through comparison study,the environmental characteristics of the unit are researched. As a result,when carbon capture rate is 85% and mass fraction of absorbent is 30%,energy consumption of desorption is 4.5 GJ/tCO2,with the thermal efficiency 38.2% and 39.3% before and after the optimization. The study also reveals that approximately 99.4% of the CO2 emissions of coal-fired unit is derived from running stages and 0.6% CO2 emissions is derived from power plant construction,coal transportation and power plant retirement. The study also indicates that the amount of CO2 emissions increased by CCS system’s construction,operation and retirement is 56.314 t/h.This amount accounts for 58.01% of the total emissions of the coupling system. CO2 emissions reduction rate is about52.65%. The CO2 emission of CCS unit and solar aided coal-fired unit is 1.72×10^-5 and 0.98×10^-5 standard unit value,compared to the coal-fired unit’s 3.63×10^-5. The contribution to the environment of the acidification is 1.5×10^-6,1.9×10^-6 and 1.0×10^-6 standard unit value and the solid waste treatment is 2.76×10^-5,3.52×10^-5 and 1.97×10^-5 standard unit value.
作者
王继选
刘小贞
高丽莎
刘丹娜
孟鑫
于佐东
Wang Jixuan;Liu Xiaozhen;Gao Lisha;Liu Danna;Meng Xin;Yu Zuodong(School of Water Conservancy and Electric Power, Hebei University of Engineering, Han dan 056021 , China;Handan Polytechnic College, Electronic and Information Engineering, Handan 056001 , China;Hebei Electric Power Engineering Supervision CO., LTD.、Shijiazhuang 050011, China;Key Lab of Condition Monitoring and Control far Power Plant Equipment Ministry of Education , North China Electric Power University, Baoding 071003, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第3期772-781,共10页
Acta Energiae Solaris Sinica
基金
河北省自然科学基金(E2017402084)
博士科研启动项目(20120134)
河北省科技厅项目(17214509D)
邯郸市科技局基金项目(1528102058-2)
河北工程大学教育教学研究项目
关键词
燃煤锅炉
碳捕集
生命周期
太阳能
coal-fired boilers
carbon capture
life cycle
solar
