基于不同蒸煮技术的硫酸盐木浆制浆过程碳排放研究

Study on Carbon Emission of Sulfate Wood Pulping Process Based on Different Cooking Techniques

本研究构建了制浆生产过程碳排放量与碳排放强度计算模型,并对DDS间歇蒸煮、卡米尔和横管连蒸系统3种典型蒸煮技术进行了分析。结果表明,DDS间歇蒸煮技术的碳排放强度低于卡米尔和横管连蒸系统,且3种典型蒸煮技术均为“零碳”技术,均存在一定减碳能力,其中基于DDS间歇置换蒸煮的制浆系统减碳量(1531.48 kgCO_(2)e/adt)强于卡米尔(1141.77 kgCO_(2)e/adt)和横管连蒸(924.52 kgCO_(2)e/adt)。碱回收系统所产生的能源满足蒸煮、洗筛和漂白等制浆全过程;制浆过程蒸煮和碱回收系统的碳排放量占比分别为26.78%、65.85%,是挖掘减碳能力的主要对象。

In this paper,the calculation model of carbon emission and carbon intensity in pulping production process was established,and three typical cooking technologies of Displacement Digester System(DDS),Kamyr and Pandia steaming system were analyzed.The results showed that the carbon intensity of DDS was lower than that of Kamyr and Pandia.The three pulping technologies were all“zero carbon”,which had certain carbon reduction ability.Among them,the carbon reduction amount of the pulping system based on DDS(1531.48 kgCO_(2)e/adt)was stronger than that of Kamyr(1141.77 kgCO_(2)e/adt)and that of Pandia(924.52 kgCO_(2)e/adt).The energy generated by alkali recovery system met the whole pulping process such as cooking,screen washing and bleaching.The carbon emission of cooking and alkali recovery systems accounted for 26.78%and 65.85%,which were the main targets of carbon reduction.