Prediction Of CO₂ Emission In Power Indusrty And A Case Study Of Coal Fired Power Plant Based On LCA

Due to the strict reduction target on CO₂ emission , this study discussed the life cycle CO₂ emission factor of the electric power industry ?LCE?, predicted the CO₂ emissions under different scenarios by using life cycle assessment ?LCA?technologies through field survey, data gathering and scenarios analysis..Furthermore,analysis of CO₂ emissions and the comprehensive environmental effects were carried out based on a typical case of coal-fired power plant with ultra low emission technology and carbon capture and storage?CCS? technology. The results of the study are shown as following:The CO₂ emission shows a growth trend in China, the CO₂ emission of power industry is much higher than those of other industries. The CO₂ emission is growing almost three times from 2000 to 2014.CO₂ emissions intensity appeared a decreasing trend,which completed the target of 40?45% reduction in advance. China's CO₂ emission is different from regions, industry structure, energy structure, industrial sector; the CO₂ emission of industries accounted for 78.4 ?80.6% of the total CO₂ emission, and the emission of power industry accounted for 34.0% ?35.8% of the total industrial emission.In our power industry, the LCE of fossil energy power generation system is significantly higher than the renewable energy power generation system In a new coal-fired power generation system with more advanced units, for the baseline scenario based on the existing power generation power system, the average annual LCE maintained the same. But it can't meet the requirement of economic development and emissions reduction; For the constraint scenario, the average annual LCE appeared a decreasing trend; For the optimized scenario, the average annual LCE is clearly droped, which is above the reduction targets. Three scenarios of the CO₂ emissions intensity of power industry can achieve emissions intensity target and the optimized scenario is more effective for CO₂ emission reduction by 2030..The influence of CO₂ emission is not so obvious after ultra-low emissions technical renovation for coal-fired power plants, but the environmental benefit has obvious superiority. If coal-fired power plants using ultra low emissions technology in our country in 2030,the CO₂ emission can reduce 1.2×109t and 1.1 ×109t,the average power LCE can reduce 115 g CO₂ - eq/kWh and 106 g CO₂ - eq/kWh according to the optimized scenario and the constraint scenario. However,they might pose certain negative effects on different kinds of environmental impact. Combustion power unit has greatest effect on the environment, and is the most important factor that cause damage to the climate change, which is mainly from coal-fired flue gas emissions of pollutants and CO₂ emission from the burning of coal. Flue gas treatment process presents negative correlation to LCA, but is not sensitive to climate change.It is of great significance for reduction of CO₂ emissions and global warming by using CCS technology for coal-fired power plant. After adding CCS system to the power plant, optimization and constraints scenario can respectively reduce 1.7 × 109t and 1.4 × 109t of CO₂ emission.The application of CCS technology has significantly improved on the 11 kinds of environmental impact types and 3 types of damage,showing good environmental friendliness; it will play an important role in alleviating global warming. However, the estimated analysis found that the application of technology of high cost, making it difficult to promote the use of large-scale.