Life Cycle Assessment Of Thermal Power Plant Based On Circulating Fluidized Bed Combustion Technology

China is an energy consumption country, electricity production is still mainly based on coal-fired thermal power generation. According to statistics, China’s thermal power industry accounted for nearly60%of China’s total coal consumption in2011, thermal power generation capacity was3.8975trillion kWh accounted82.54%. Coal-fired power generation industry consumed high energy and high material, and the emissions of gaseous pollutants had a huge impact on the environment. Combustion system as the core part of the thermal power plant coal-fired power cost more coal, water and energy than other systems with high emission of gaseous pollutants and solid waste. To improve the utilization of coal energy and improve environmental quality, various countries developed clean coal power generation technologies with more efficient and less pollutant emissions actively. Circulating fluidized bed boiler combustion technology as a kind of clean coal power generation technology had many advantages, such as good fuel eligibility, high combustion efficiency, low emissions of gaseous pollutants, large range of load adjustment, and fly ash and slag comprehensive utilization, with furnace desulfurization. Life cycle assessments of clean-coal power generation technology focused on different technologies currently, and there were few researches on specific enterprise. According life cycle assessment method, the research for specific cases aims to provide theoretical data support of coal power generation for circulating fluidized bed boiler combustion technology including follow contents:(1) Method of life cycle assessment (LCA) was applied to evaluate the resource depletion and environmental impact potential of a thermal power plant employing circulating fluidized bed (CFB) combustion technology. Scope of the research was identified including upstream and downstream process, and life cycle inventory was established based on five production process during power production. According to the life cycle inventory, researches for resource consumption and environmental impact potential were conducted.(2) Based on production life cycle inventory, using LCA theory and CML2001Dec07model changed the data into environmental impact indicator. Resource consumption and pollutant emission were calculated based on main non-renewable resources consumption. Global Warming Potential, Abiotic Depletion Potential, Eutrophication Potential, Human Toxicity Potential, Acidification Potential and Photochemical Ozone Creation Potential were chosen to analyze life cycle inventory results and calculate production process potential to distinguish which process made heaviest environmental impact with analyzing the reason. The results show that coal consumption is more than limestone, and consumed faster. Boiler consumption process and heating power generation process occupy the heaviest environmental potential, and Global Warming Potential and Abiotic Depletion Potential are the main impact factor during power production.(3) Using life cycle assessment theory to estimate plan implementation effect. LCA model is constructed to evaluate NOx emission reduction combined with research results and national laws and regulations. Compared with before and after the implementation of emission reduction plan, project feasibility is demonstrated. The results show that after the plan implement, the concentration of NOx will be reduced to200mg/Nm3from248.15mg/Nm3, the environmental potential will be decreased3.6%. The research provides support for denitration project development of power generation.