中国电机工程学报Issue(5)：1169-1175,7.DOI:10.13334/j.0258-8013.pcsee.2015.05.018
准东煤在燃烧过程中的矿物演变过程及Na、Ca释放规律
Mineral Conversion Regularity and Release Behavior of Na, Ca During Zhundong Coal’s Combustion
摘要
Abstract
Tianchi Energy coal was selected as the research object, and phase changes in high and low temperature ashes were comparatively analyzed. Mineral conversion in heating process was thoroughly and meticulously studied through thermogravimetric experiment of low-temperature ash. Contents of Na and Ca in coal ashes made at different temperatures were measured respectively to observe their release regularities, and precipitating types of Na, Ca were simulated by Factsage. Results show that the original minerals of Zhundong coal mainly include calcium sulfate hydrate, calcite, quartz, kaolinite and pyrite. During the process of combustion, complex chemical reactions occur among these minerals, and they transform to brownmillerite, calcium silicate, et al. Experiment results show that Na in coal begins to precipitate during 400-600℃, Ca partially precipitates before 600 ℃ and precipitates fastest after 1 000℃.Combining with simulation results, it’s speculated that Na precipitates in the form of NaCl(g) before 1 000 ℃. After 1 000 ℃, Na precipitates in the form of NaOH(g) and Na2SO4(g). Eutectics are formed when Ca interacts with iron and silicon containing minerals after 1 000℃. The eutectics precipitate at molten state, which leads to sharp decrease of Ca.关键词
准东煤/矿物演变/燃烧/释放规律/热力学Key words
Zhundong coal/mineral conversion/combustion/release regularity/thermodynamics分类
信息技术与安全科学引用本文复制引用
陶玉洁,张彦威,周俊虎,景雪晖,李涛,刘建忠,岑可法..准东煤在燃烧过程中的矿物演变过程及Na、Ca释放规律[J].中国电机工程学报,2015,(5):1169-1175,7.基金项目
国家重点基础研究发展计划项目(973计划)(2012CB214906)；中央高校基本科研业务费专项资金项目。The National Basic Research Program (973 Program)(2012CB214906)；Supported by the Fundamental Research Funds for the Central Universities （973计划）
