化工进展2024，Vol.43Issue(8)：4253-4261,9.DOI:10.16085/j.issn.1000-6613.2023-1027
化学链燃烧中煤灰原位改性对钙基载氧体炭沉积的影响
Effect of in-situ modification of coal ash on carbon deposition of Ca-based oxygen carrier in chemical looping combustion
摘要
Abstract
The modified CaSO4-Ash composite oxygen carrier was prepared by in-situ modification of Ca-based oxygen carriers using Zhundong coal ash in a fluidized bed.With the help of CO2 ion flow intensity curves in TG-MS experiments,the influence of the loading amount of Zhundong coal ash on the carbon deposition characteristics during the oxygen carrier reduction reaction process was investigated,and a quantitative coupling experiment of solid-solid reaction and gas-solid reaction was proposed to explore the source of carbon deposition.The results showed that the amount of carbon deposition decreased first and then increased with the increase of the proportion of coal ash in the process of in-situ modification.The CaSO4-10Ash composite oxygen carrier prepared by adding 10%of Zhundong coal ash could minimize the problem of carbon deposition and reduce it by 79.5%.In the solid-solid reaction,with the increase of the coal ash loading ratio,the residual amount of coal coke decreased.When the coal ash loading ratio in the gas-solid reaction was greater than 5%,the performance of the composite oxygen carrier began to decline,and the carbon deposition began to increase;when the coal ash loading ratio was greater than 10%,the amount of carbon deposition that increased as the load ratio continued to increase mainly came from carbon deposit generated by CO decomposition.关键词
化学链燃烧/准东煤/煤灰改性/CaSO4载氧体Key words
chemical looping combustion/Zhundong coal/coal ash modification/CaSO4 oxygen carrier分类
能源科技引用本文复制引用
梁国威,金晶,董波,侯封校..化学链燃烧中煤灰原位改性对钙基载氧体炭沉积的影响[J].化工进展,2024,43(8):4253-4261,9.基金项目
国家自然科学基金(51976129) （51976129）
上海市科委项目(23010503500) （23010503500）
山西省基础研究计划(202103021223197). （202103021223197）
