中国水泥生命周期粉煤灰替代的CO_(2)减排研究

Study on CO_(2) reduction of cement with fly ash substitute from the perspective of life cycle in China

采用中国水泥企业温室气体排放核算方法及政府间气候变化专门委员会的能源使用CO_(2)排放计算方法,将不同粉煤灰替代率下原料及能源使用引起的CO_(2)减排进行核算.结果表明,与燃煤电厂产业共生可减排92.676kgCO_(2)/t水泥.而粉煤灰替代熟料是中国水泥CO_(2)减排的主要部分,与替代生料结合可产生最大CO_(2)减排373.303kg/t水泥.另外,粉煤灰替代部分水泥形成混凝土的碳化作用,到2050年可吸收192.015kgCO_(2)/t水泥.粉煤灰替代后,对余热发电变化及外购清洁电力使用比例增加引起的减排进行预测,发现此项举措可有效促进水泥行业“双碳”目标达成.

The CO_(2) reduction induced by material in the situation of fly ash replacement is calculated by the guideline of Greenhouse Gas Emissions of Chinese Cement Enterprises.Meanwhile,the CO_(2) reduction induced by energy employment also defined by the methods from Intergovernmental Panel on Climate Change.The results show that considering industrial symbiosis with coal-fired power plants,92.676kg/t cement of CO_(2) are reduced.It is demonstrated that the replacement of clinker with fly ash is the main part leading to CO_(2) reduction in China's cement industry.When combined with the replacement of raw materials,the maximum CO_(2) reduction per ton of cement can be up to 373.303kg.In the application stage,the carbonization effect of concrete formed by fly ash and Portland cement has increased,and one ton of cement will adsorb 192.015kg of CO_(2) by 2050.In the context of fly ash replacement,the emission reduction caused by the change of waste heat generation and the clean electricity employment with different proportion are forecasted.It is found that the measure can also effectively promote the achievement of carbon peak and neutrality goals.