摘要
以同时消纳燃煤固废(粉煤灰与脱硫石膏)和CO_(2)为研究目的,选取西部地区某燃煤固废综合利用率较低燃煤电厂为目标电厂,首先评估不同燃煤固废的固碳潜力并筛选最佳掺配质量比,其次从受控元素总量、受控元素迁移风险、综合环境风险的角度对燃煤固废固碳后的环境风险进行评价,最后将燃煤固废的固碳产物用于制备生态透水砖,并分析产品的环境及经济效益,促进燃煤固废的资源化、减量化、无害化及协同减碳。结果表明:设定实验条件下该电厂燃煤固废的最大固碳量可达38.31g/kg;固碳反应前,粉煤灰对堆存场地的环境风险较脱硫石膏大,脱硫石膏可对粉煤灰的环境风险实现良好的“中和”;固碳反应后,由于各受控元素的迁移风险得到改善,粉煤灰固碳产物的环境风险低于固碳前,而脱硫石膏中Hg的迁移风险经固碳后显著提升,进而提高了脱硫石膏的环境风险,混合固废的环境风险变化趋势介于2种固废之间;燃煤固废固碳后制生态透水砖抗压强度可达30 MPa,较传统砂砖可减排CO_(2)94.3 kg/t。
A coal-fired power plant located in the western region of China with low comprehensive utilization rate of coal-fired solid waste was selected as the target power plant to simultaneously consume solid waste(fly ash and desulfurization gypsum)and CO_(2).Firstly,the carbon sequestration potential of different blending ratios of coal-fired solid waste was evaluated and the optimal blending ratio was selected.Secondly,the environmental risks of coalfired solid waste after carbon sequestration were evaluated from the perspectives of total controlled elements,migration risks of controlled elements,and comprehensive environmental risks.Finally,the carbon sequestration products of coal-fired solid waste were used to prepare ecological permeable bricks,and the environmental and economic benefits of the products were analyzed to promote the resource utilization,reduction,harmlessness,and collaborative carbon reduction of coal-fired solid waste.The results showed that the maximum carbon sequestration of coal-fired solid waste could reach 38.31 g/kg under the set experimental conditions.Before the carbon fixation reaction,fly ash posed a greater comprehensive environmental risk to storage sites compared to desulfurization gypsum,which could effectively neutralize the environmental risks of fly ash.After the carbon fixation reaction,the environmental risk of fly ash carbon fixation products was lower than before carbon fixation due to the reduced migration risk of various controlled elements.The migration risk of Hg in desulfurization gypsum was significantly increased after carbon fixation,which increased the environmental risk of desulfurization gypsum.The trend of environmental risk change of mixed solid waste was between the two types of solid waste.Compared with traditional sand bricks,the production of ecological permeable bricks from carbon sequestration products of coal-fired solid waste could reduce CO_(2) emissions by 94.3 kg/t,and the compressive strength could reach over 30 MPa.
作者
姜龙
郭智慧
刘轩
董召民
宋云畅
孙健
JIANG Long;GUO Zhihui;LIU Xuan;DONG Zhaomin;SONG Yunchang;SUN Jian(North China Electric Power Research Institute Co.,Ltd.;Beijing Jingneng Technology Co.,Ltd.;School of Energy and Mechanical Engineering,Nanjing Normal University)
出处
《环境工程技术学报》
北大核心
2025年第5期1513-1521,共9页
Journal of Environmental Engineering Technology
基金
国家电网华北电力科学研究院有限责任公司自有资金项目(KJZ2024015)。
关键词
粉煤灰
脱硫石膏
风险评价
固碳
综合利用
效益分析
fly ash
desulfurized gypsum
risk assessment
carbon sequestration
comprehensive utilization
benefit analysis
作者简介
姜龙(1988-),男,高级工程师,博士,主要从事电力环保、污染物排放治理及综合利用研究,kaveykikiy@163.com。
