脱硫灰处理生命周期环境影响评价

Environmental impact assessment and research on the life cycle of desulfurization ash treatment

随着半干法烟气脱硫技术的普及,其副产物脱硫灰的产量亦日益增加。大量堆存的脱硫灰导致了土地占用、环境污染等问题。氧化和填埋是半干法烟气脱硫灰主要的处理方式,采用生命周期评价(LCA)理论,对脱硫灰氧化和填埋处理进行清单分析,定量评价两种处理方式产生的环境影响和经济效益。结果表明,填埋处理环境代价虽低于脱硫灰氧化处理,但综合考虑脱硫灰氧化产生的脱硫石膏带来的环境效益后,氧化处理净环境效益高于填埋。同时,处理每吨脱硫灰可为企业带来177.5元收益,脱硫灰氧化工艺对环境和经济均有积极影响。

With the popularization of semi-dry flue gas desulfurization technology, the output of by-product desulfurization ash is increasing. A large amount of stored desulfurization ash causes problems such as land occupation and environmental pollution. Oxidation and landfill are the main treatment methods of semi-dry flue gas desulfurization ash. Life cycle assessment(LCA) theory is adopted to analyze the inventory of desulfurization ash oxidation and landfill treatment to quantitatively evaluate the environmental impact and economic benefits of the two treatment methods. The results show that although the environmental cost of landfill treatment is lower than that of desulfurization ash oxidation treatment, after comprehensively considering the environmental benefits of desulfurized gypsum produced by the oxidation of desulfurization ash,the net environmental benefit of oxidation treatment is higher than that of landfill. At the same time, processing each ton of desulfurized ash can bring an enterprise income of 177.5 yuan, and the desulfurized ash oxidation process has a positive impact on the environment and economy.