在全球温室气体浓度升高的背景下,如何减少碳排放、增加碳吸收是当前应对气候变化研究的热点.本研究基于我国1963-2016年粗钢产量,采用温室气体清单指南编制方法,建立了钢渣碳汇核算方法,核算了我国1963-2016年钢渣碳汇量,并进行了不确定性分析.结果表明: 1963-2016年间,我国钢渣的年碳汇量总体呈上升趋势,从3.75*10~3 t C增加至1359.32*10~3 t C.1963-2016年间我国钢渣累积碳汇量为15*10~6 t C,钢渣碳汇的总不确定性约为30.4%.钢渣年碳汇量由当年产钢渣碳汇量和历年产钢渣碳汇量两部分组成.由于钢渣结构致密,年碳化速率较小,导致1963-2016年间当年产钢渣碳汇量较小,占钢渣碳汇总量的37%;历年产钢渣碳汇量较大,占钢渣碳汇总量的63%.虽然钢渣年碳汇量不大,但长期累积碳汇量非常可观,其碳汇作用不容忽视.今后研究应细化不同环境条件下钢渣碳化速率,降低钢渣碳汇核算的不确定性;推动以钢渣为原材料的碳捕集与封存技术发展,增加有效碳汇,为我国应对气候变化国际谈判提供科技支撑.
英文摘要:
Under the context of the elevated greenhouse gases,how to reduce carbon emissions and increase carbon absorption is the focus of current research on climate change. Based on data of Chinese crude steel production from 1963 to 2016 and greenhouse gas inventory method,we established steel slag carbon sequestration calculation method. The steel slag carbon sequestration from 1963 to 2016 was estimated and the uncertainty analysis was made. The results showed that annual carbon sink of steel slag in China increased from 3.75*10~3 t C in 1963 to 1359.32*10~3 t C in 2016. The steel slag accumulative carbon sink was 15*10~6 t C,with about 30.4% total uncertainty during 1963-2016. The annual carbon sink of steel slag was composed of carbon sink of the current year steel slag and the previous years. Due to the dense structure and low carbonation rate of steel slag, the carbon sink of the current year was small,accounting for 37% of the total,while that of the previous years were relatively large,accounting for 63% of the total. Although annual carbon sink of steel slag was small,the long-term accumulative carbon sink for steel slag was very considerable, which could not be ignored. Future research should refine carbonation rate of steel slag under different environmental conditions to reduce steel slag carbon accounting uncertainty,promote the development of carbon capture and storage (CCS) technology with steel slag as raw material to increase effective carbon sequestration,which would provide scientific support for Chinas international negotiations on climate change.