摘要
元素的迁移与富集特性对煤气化装置的长周期稳定运行有重要影响。本文运用X射线衍射、X射线荧光光谱分析等手段,对气流床水煤浆气化装置使用的煤及气化后的粗细渣进行了研究,发现Na、P、V、Ti等元素较容易在细渣中富集,Fe、Ca、Cr元素则容易在粗渣中富集。热力学计算结果表明,气化过程中V元素主要是以气态V2O_(3)或VO_(2)的形式存在;高温下S元素大部分以气态COS和H_(2)S等形式存在。在升温过程中Cr元素与Mg、Fe结合生成固相MgCr_(2)O_(4)、FeCr_(2)O_(4),1100℃后Cr元素较容易以CrO及Cr_(2)O_(3)形式存在于液态熔渣中。在管式炉中开展了弱还原性气氛实验,探究了温度对煤灰中元素富集的影响特性。结果表明,气化温度越高,Na、S元素易向气相富集,Ca、Fe、Cr元素易在熔渣中富集。
The migration and enrichment characteristics of elements have a significant impact on the long-term stable operation of coal gasification plants.The samples(the raw coal and the coarse and fine slag after gasification)collected from entrained-flow coal water slurry gasification plants were studied using X-ray diffraction(XRD)and X-ray fluorescence spectrometer(XRF).It is found that elements such as Na,P,V,and Ti were more easily enriched in the fine slag,while elements such as Fe,Ca,and Cr were more easily enriched in the coarse slag.The thermodynamic calculation results indicated that the V element mainly existed in the form of gaseous V2O_(3) or VO_(2) during the gasification process;at high temperatures,the S element basically transformed into volatile forms such as gaseous COS and H_(2)S,with little residue in both coarse and fine slag.During the heating process,Cr element mainly combined with Mg and Fe to form solid phase MgCr_(2)O_(4) and FeCr_(2)O_(4).After reaching about 1100℃,it was more likely to exist in the form of CrO and Cr_(2)O_(3) in the liquid slag.A weak reducing atmosphere was carried out in a tube furnace to explore the influence of temperature on the enrichment of elements in coal ash.The results showed that the higher the gasification temperature,the easier Na and S elements were enriched in the gas phase,while Ca,Fe,and Cr elements were enriched in the slag.
作者
王伟成
吴昊
王兴军
郭庆华
刘海峰
于广锁
王辅臣
WANG Weicheng;WU Hao;WANG Xingjun;GUO Qinghua;LIU Haifeng;YU Guangsuo;WANG Fuchen(School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China;Institute of Clean Coal Technology,Shanghai 200237,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第10期5942-5949,共8页
Chemical Industry and Engineering Progress
基金
国家自然科学基金联合基金(U21A20319)。
关键词
水煤浆
煤气化
迁移
富集
热力学
coal water slurry
coal gasification
migration
enrichment
thermodynamic
