摘要
生物质与煤耦合燃烧发电有助于减少碳排放、促进废弃物资源化利用。然而,生物质与煤燃料燃烧特性存在差异,且两种燃料在锅炉中的适配性不同,可能气固相燃烧产物中存在未燃尽碳。为测定耦合燃烧过程中气固相未燃尽碳来自生物质与煤的比例,从而定量诊断耦合燃烧过程,本研究建立了烟气及灰渣中未燃尽碳石墨化制样方法,提出了基于^(14)C检测的生物质与煤耦合燃烧气固相未燃尽碳占比测量方案,并在实验室验证了该方案准确性,气固相未燃尽碳来自两种燃料占比测定的相对误差均小于±4%。该方案成功应用于南京某生物质与煤直接耦合燃烧的循环流化床工业锅炉。结果显示,烟气中未燃尽碳来源于生物质与煤的占比分别为51.16%和48.84%,飞灰中未燃尽碳来源于生物质与煤的比例为0.86%和99.14%,底渣中未燃尽碳来源于生物质与煤的比例为1.17%和98.83%。
Biomass-coal co-firing power generation helps reduce carbon emissions and promotes the resource utilization of waste.However,due to differences in the combustion characteristics of biomass and coal,as well as their varying compatibility in the boiler,the combustion products in both the gas and solid phases may contain a significant amount of unburned carbon.To determine the proportion of unburned carbon in both the gas and solid phases from each fuel during co-firing combustion and to quantitatively diagnose the co-firing process,this study developed a method for preparing graphite samples of unburned carbon in flue gas and ash.Based on this method,a^(14)C-based measurement scheme was proposed to determine the proportions of unburned carbon in both the gas and solid phases from biomass and coal during co-firing combustion.The accuracy of this scheme was verified in the laboratory,with relative errors of less than±4%for the measurement of unburned carbon contributions from the two fuels.The scheme was successfully applied to an industrial circulating fluidized bed boiler for direct biomass-coal co-firing in Nanjing.The results showed that the proportions of unburned carbon in the flue gas from biomass and coal were 51.16%and 48.84%,respectively,while the proportions in the fly ash were 0.86%and 99.14%,and in the bottom ash,the proportions were 1.17%and 98.83%,respectively.
作者
王胜
骆仲泱
王寅辰
余春江
李浦
WANG Sheng;LUO Zhongyang;WANG Yinchen;YU Chunjiang;LI Pu(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
出处
《能源工程》
2025年第6期140-146,共7页
Energy Engineering
基金
国家重点研发计划“煤与生物质耦合发电技术”(项目编号:2022YFB4202000)。
