NH_3/煤混烧技术在熟料煅烧过程中的适应性研究  

Adaptability of NH3/Coal Co-firing Technology in Process of Clinker Calcination

作　　者：曲齐齐 房晶瑞[1] 马腾坤 陈阁 张帅 石信超 QU Qiqi;FANG Jingrui;MA Tengkun;CHEN Ge;ZHANG Shuai;SHI Xinchao(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024

出　　处：《能源与节能》2024年第11期40-44,共5页Energy and Energy Conservation

基　　金：中国建筑材料科学研究总院有限公司自立项目(ZA-65)。

摘　　要：应用绿色替代燃料降低水泥熟料煅烧煤耗,是水泥行业降低碳排放的重要技术途径。氨(NH_(3))作为一种新型零碳燃料,被认为是当前重要的氢源之一。基于计算颗粒流体力学(CPFD)方法,对工业级水泥窑预煅烧炉进行了三维数值模拟,研究了掺氨比(0%~20%)对燃料燃尽特性及NO生成特性的影响。结果表明:NH_(3)在分解炉中具有良好的燃尽性能,CO_(2)排放量随NH_(3)掺烧比的增加呈线性下降,当掺氨比为20%时,CO_(2)排放量比纯煤燃烧低14.7%,即每生产1 t水泥熟料,减排CO_(2)0.1671~0.2003 t;与纯煤燃烧相比,煤粉中掺混NH_(3)后NO排放量降低,随着掺混比例进一步提高,NO排放量逐渐降低;掺氨比越高,炉内温度越低,将三次空气中O_(2)富集至体积分数为40%可以解决掺氨比20%时引起的温度下降问题,但NO体积分数会出现激增。The application of green alternative fuels to reduce coal consumption in cement clinker calcination is an important technical way for the cement industry to reduce carbon emissions.Ammonia(NH_(3))as a new carbon-free energy,is considered as one of the most imporant hydrogen sources at present.This paper performed a three-dimensional simulation research in the industrial precalciner of a cement kilnr based on the calculate particle fluid dynamics(CPFD)method.The influences of NH_(3)co-firing ratio on fuel burnout characteristics and NO generation characteristics were analyzed by simulation.The results showed that the burnout properties of NH_(3)were excellent in co-firing calciner,CO_(2)emissions decreased linearly with the increase of co-firing ratio,when the co-firing ratio was 20%,the CO_(2)emission was reduced by 14.7%compared with pure coal combustion,that was,for every ton of cement clinker produced,CO_(2)emission reduction was 0.1671-0.2003 t;NO emissions decreased after ammonia mixing in pulverized coal,and NO emissions gradually decreased with the further increase of co-firing ratio;higher NH_(3)blending ratio led to lower temperature in the calciner.Enriching O_(2)volume fraction to 40%in the tertiary air can compensate the temperature decline caused by 20%NH_(3)co-firing,while it brings an undesired surge in NO volume fraction.

关 键 词：氨燃料 混烧 分解炉 数值模拟 减排 

分 类 号：TQ172.6[化学工程—水泥工业]