生物质混煤加压富氧燃烧SO_(2)的排放特性  

Sulfur dioxide emission characteristics of biomass blended coal under pressurized oxy-fuel combustion

作　　者：卢昌杰 刘彦[2] 廉盟 LU Changjie;LIU Yan;LIAN Meng(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China;School of Sciences,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018 [2]杭州电子科技大学理学院,浙江杭州310018

出　　处：《杭州电子科技大学学报（自然科学版）》2023年第5期44-50,共7页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：国家自然科学基金资助项目(11701133)。

摘　　要：作为一项可减少温室气体排放的先进、高效碳捕集技术,加压富氧燃烧已引起世界性的关注。以山西煤和麦秆为原材料,借助Chemkin软件探究不同掺混比(生物质占比分别为0、10%、30%、50%)、不同气氛(空气以及O_(2)浓度分别为21%、30%、40%、50%的O_(2)/CO_(2)气氛)和不同燃烧压力(0.1~4.0 MPa)对生物质混煤加压富氧燃烧过程中SO_(2)生成的影响。结果显示:不同掺混比,SO_(2)析出程度存在明显差异,随着生物质掺混比例的增大,SO_(2)释放速率减小,总的排放量降低;随O_(2)浓度增加,SO_(2)的释放速率和排放量均增加,在相同O_(2)浓度时,O_(2)/CO_(2)气氛下SO_(2)的排放量略小于空气气氛下;在富氧气氛下,随着燃烧压力的升高,SO_(2)生成量逐渐减少。同时利用生成速率(ROP)分析得知,当燃烧压力由0.1 MPa提升到1.6 MPa,SO_(2)总生成量的减少是由八个主要基元反应共同作用的结果,并预测了在加压富氧条件下生物质混煤中硫转化的主要反应路径。As an advanced and efficient carbon capture technology that can reduce greenhouse gas emissions,pressurized oxy-fuel combustion technology has attracted worldwide attention.Using Shanxi coal and wheat straw as raw materials,Chemkin software was used to explore effects of different mixing ratios(biomass proportions of 0,10%,30%,50%),different atmospheres(air and O_(2)/CO_(2)atmosphere with O_(2)concentration of 21%,30%,40%,50%)and different combustion pressures(0.1 to 4.0 MPa)on the SO_(2)emissions characteristics of pressurized oxy-fuel combustion processes.The results show that there are obvious differences in the degree of SO_(2)precipitation in different mixing ratios,and with the increase of biomass blending ratio,the release rate of SO_(2)decrease,and the total emission decreases;with the increase of O_(2)concentration,the release rate and emission of SO_(2)increase,at the same O_(2)concentration,the SO_(2)emission in O_(2)/CO_(2)atmosphere is slightly smaller than that in air atmosphere;in O_(2)/CO_(2)atmosphere,the production of SO_(2)decreases gradually with the increase of combustion pressure.At the same time,the rate of production(ROP)analysis shows that when the combustion pressure is increased from 0.1 MPa to 1.6 MPa,the reduction of total SO_(2)production is the result of the joint influence of eight major primitive reactions,and the main reaction path of sulfur conversion in biomass mixed coal under pressurized oxygen-fuel combustion is predicted.

关 键 词：加压富氧燃烧 生物质 二氧化硫排放 CHEMKIN 

分 类 号：TK16[动力工程及工程热物理—热能工程]