张衡,张鹏启,王祖威,杨琪琪,王月伦,张洪
ZHANG Heng,ZHANG Pengqi,WANG Zuwei,YANG Qiqi,WANG Yuelun,ZHANG Hong

• 1:秦皇岛出入境检验检疫局煤炭检测技术中心
• 2:中国矿业大学化工学院

摘要(Abstract)：

针对准东煤燃烧过程中存在的结渣问题,采用浮沉法将准东原煤分成不同密度子样,测定了各密度级别灰样的化学组成、矿物组成、煤灰熔融温度和烧结温度,探索准东煤灰微观不均匀熔融规律,揭示准东燃烧结渣机理。结果表明,准东煤粉主要分布在1.40~1.50 g/cm3。煤粉密度从<1.50g/cm3升至>1.60 g/cm3时,煤灰中SiO_2含量从28.82%提高至60.27%,CaO含量从29.91%降至3.96%,Fe_2O_3含量则从5.85%提高至12.68%,MgO含量从9.09%降至1.92%;软化温度从1 297℃降至1 127℃,烧结温度则从551℃升高至>1 000℃。不同密度煤粉颗粒中化学组成和矿物组成的分化导致灰熔融性的不均匀分布,而其灰成分的特殊性导致了熔融温度和烧结温度变化趋势的差异。
To solve the slagging problem during coal combustion,Zhundong coal was separated into different density fractions by float-sink test.Chemical composition,mineral composition,coal ash fusion temperature and sintering temperature were measured to explore microscopic heterogeneous ash melting behavior and slagging mechanism.Results show that the density fractions are mainly concentrating in range of1. 40-1. 50 g/cm3.Obvious changes of SiO_2,CaO,Fe_2O_3 and Mg O are found in the ranges of 28. 82%-60. 27%,29. 91%-3. 96%,5. 85%-12. 68% and 9. 09%-1. 92%,respectively,as the density of raw coal increases from less than 1.50 g/cm3 to above 1. 60 g/cm3.The softening temperatures correspondingly decrease from 1 297 ℃ to 1 127 ℃,while the sintering temperatures raise from 551 ℃ to above 1 000℃.Mechanism analysis shows that the variation of chemical composition and minerals are the fundamental reason for heterogeneous melting behavior,while special composition of Zhundong coal leads to the different trends of melting and sintering.

关键词(KeyWords)： 准东煤;结渣;灰熔融性;不均匀熔融
Zhundong coal;slagging;ash melting behaviors;heterogeneous melting behavior

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金-山西煤基低碳联合基金资助项目(U1510106)

作者(Author): 张衡,张鹏启,王祖威,杨琪琪,王月伦,张洪
ZHANG Heng,ZHANG Pengqi,WANG Zuwei,YANG Qiqi,WANG Yuelun,ZHANG Hong

DOI: 10.13226/j.issn.1006-6772.2018.03.017

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