联合循环发电系统全生命周期?环境学评估

Exergoenvironmental evaluation for combined cycle power generation system based on life cycle assessment

以9FA级燃气-蒸汽联合循环机组为研究对象,建立基于全生命周期(LCA)和Eco-indicator99的?环境学分析模型,探究电力生产过程中环境学成本形成过程.在对系统组件进行?分析的基础上,明确各组件在全生命周期内的环境学影响,并划分影响组件输出产品的环境学影响因素.从组件层面揭示联合循环机组环境影响的形成过程以及单个组件对整个系统环境影响的贡献程度.研究表明,大部分组件自身的环境学影响较小,?损引起的环境学影响构成该组件主要的环境学影响,但燃烧室内污染物降低的环境学影响大于其?损所产生的环境学影响.联合循环电厂生产电力的环境学影响为5.80 mPts/MJ,近乎"超低排放"燃煤电厂生产电力的环境学影响的一半.

An exergoenvironmental analysis model based on life cycle assessment (LCA) and Eco-indicator99 was established to explore the environmental cost formation process in the power production process, taking the 9FA gassteam combined cycle unit as the research object. The environmental impacts of each component throughout the life cycle were clarified, and the environmental impact factors affecting the component output products were divided, based on the exergoenvironmental analysis of system components. The formation process of the environmental impact of the combined cycle unit and the contribution of individual component to the overall system environmental impact were revealed from the component level. Results showed that the environmental impact of the component itself was small for most components, and the environmental impact caused by the damage constituted the main environmental impact of the component, but the environmental impact of the pollutant reduction in the combustion chamber was greater than that caused by the damage. The environmental impact of electricity production from the combined cycle power plant was 5.80 mPts/MJ, which was nearly half of the environmental impact of electricity production from “ultra-low emission” coal-fired power plants.