State Grid Qinghai Electric Power Company

双碳目标是中国在全球碳减排的时代背景下,对全世界作出的庄严承诺,也是实现可持续发展的内在要求。水泥行业作为仅次于发电、钢铁行业的第三大温室气体排放源,在未来应当承担起碳减排的任务。目前水泥窑余热利用仅仅停留在发电阶段,并未贴合时代要求进一步开发利用。因此提出新型集成碳捕集的水泥窑余热利用多联产系统。将售电、热和冷的收入用于补偿昂贵的碳捕集的投资成本。水泥生产的余热利用并不足以弥补所有的碳捕集成本,但可满足部分CO2的捕集,因此最终可以确定适当的碳捕集率(18.89%)。所提出的新系统分为2种模式,在供热模式下,可从碳捕集过程中回收5.52MW的能量,并达到10.28%的系统热效率和10.71%的总效率。制冷模式下,3.66MW的能量被回收后驱动吸收式制冷系统,以提供0.82MW的冷量。经济分析表明,系统年收入达到2049.13万元,而碳捕集成本(ηCOA)低至281.54元/t(以CO2计)。这将为未来水泥生产满足减碳要求,进一步对水泥厂的余热进行深度利用并减少碳捕集投资提供了可行的参考。

The dual carbon goal is a solemn commitment made by China to the world in the era of global carbon emission reduction, and itis also an inherent requirement for achieving sustainable development. As the third largest source of greenhouse gas emissions after power generation and steel industry, the cement industry should undertake the task of carbon reduction in the future. At present, the wasteheat utilization of cement kiln only stays in the power generation stage and does not meet the requirements of the times for further development and utilization. Therefore, a new integrated carbon capture cement kiln waste heat utilization multigeneration system was proposed.Revenues from sales of electricity, heat and cooling are used to offset the investment costs of expensive carbon capture. The use of wasteheat from cement production is not sufficient to cover all carbon capture costs, but it can meet some CO2 capture costs, so that an appropriate carbon capture rate (18.89%) can be determined. The proposed new system can be divided into two modes. In the heating mode,5.52 MW of energy can be recovered from the carbon capture process, and the overall exergic efficiency reaches 10.28% and 10.71%. Inthe cooling mode, 3.66 MW of energy is recovered to drive the absorption refrigeration system to provide 0.82 MW of cooling capacity.Economic analysis shows that the annual revenue of the system reaches 20.491 3 million yuan, while the carbon capture cost (ηCOA) is aslow as 281.54 yuan/ t (in CO2). This will provide a feasible reference for cement production to meet the carbon reduction requirements inthe future, further utilize the waste heat of cement plants and reduce the investment in carbon capture.

国家自然科学基金资助项目(52276006;52106008)

许德操,李显桃,李楠,等.基于碳捕集的水泥窑余热深度利用系统性能分析[ J]. 洁净煤技术,2023,29(11):99-112.

XU Decao,LI Xiantao,LI Nan,et al.Performance analysis of waste heat deep utilization of cement plant based on carbon dioxide capture[J].Clean Coal Technology,2023,29(11):99-112.