烟气气氛对准东煤灰熔融特性影响的显微观察

TQ534; 准东煤田预测储量高,准东煤灰具有高硫,低硅铝,高碱/碱土金属等特点,实际燃用准东煤锅炉出现了严重的沾污、结渣现象,影响准东煤的大规模开发利用.烟气气氛(含有大量SO2,SO3)可能影响高温下Na2SO4的生成/分解,从而影响煤灰的熔融过程.深入研究烟气气氛对准东煤灰熔融特性的影响,有助于加深对锅炉结渣过程的理解,为燃用准东煤锅炉结渣防控提供技术支持.为获得烟气气氛对准东煤灰熔融特性的影响规律,建立了单热电偶高温显微观察系统(SHTT),比较了还原性气氛、氢化性气氛、惰性气氛及模拟烟气气氛下准东煤灰的熔融特性.结果 表明,建立的灰熔融温度测试方法精度较好,96.92％的灰样熔融温度...

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Published in煤炭学报 Vol. 46; no. 1; pp. 263 - 273
Main Authors 吕俊复, 史航, 吴玉新, 姚伟, 刘青, 张海
Format Journal Article
LanguageChinese
Published 清华大学热科学与动力工程教育部重点实验室,北京100084%中国石油国际事业有限公司,北京100033%西安热工研究院有限公司,陕西西安710032 2021
Subjects
煤灰熔融特性
准东煤
单热电偶高温显微观察系统(SHTT)
烟气气氛
SO2
Online AccessGet full text
ISSN0253-9993
DOI10.13225/j.cnki.jccs.YG20.1858

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Abstract TQ534; 准东煤田预测储量高,准东煤灰具有高硫,低硅铝,高碱/碱土金属等特点,实际燃用准东煤锅炉出现了严重的沾污、结渣现象,影响准东煤的大规模开发利用.烟气气氛(含有大量SO2,SO3)可能影响高温下Na2SO4的生成/分解,从而影响煤灰的熔融过程.深入研究烟气气氛对准东煤灰熔融特性的影响,有助于加深对锅炉结渣过程的理解,为燃用准东煤锅炉结渣防控提供技术支持.为获得烟气气氛对准东煤灰熔融特性的影响规律,建立了单热电偶高温显微观察系统(SHTT),比较了还原性气氛、氢化性气氛、惰性气氛及模拟烟气气氛下准东煤灰的熔融特性.结果 表明,建立的灰熔融温度测试方法精度较好,96.92％的灰样熔融温度与标准灰熔点仪测得的流动温度相比偏差在3％以内(≤40℃),最大偏差＜50℃,测试偏差在煤灰熔融特性测试允许误差范围内.当碱酸比R＜2.5时,气氛对灰熔融特性无显著影响;当R＞2.5时,煤灰组分中Fe2O3质量分数较高,导致还原性气氛下灰熔点降低.烟气中SO2对煤灰熔融温度的影响与煤灰组分相关,当R＞2.5时,煤灰中碱/碱土金属及硫(AAEM/S)质量分数较高,烟气中SO2会抑制煤灰中CaSO4的分解,提升高温下煤灰中CaO质量分数,并减少长石,辉石等低熔点矿物的生成,进而提升煤灰熔融温度.烟气中SO2是促进富含Na/Fe硫酸盐或硫化物超细颗粒生成及沉积的重要因素.
AbstractList TQ534; 准东煤田预测储量高,准东煤灰具有高硫,低硅铝,高碱/碱土金属等特点,实际燃用准东煤锅炉出现了严重的沾污、结渣现象,影响准东煤的大规模开发利用.烟气气氛(含有大量SO2,SO3)可能影响高温下Na2SO4的生成/分解,从而影响煤灰的熔融过程.深入研究烟气气氛对准东煤灰熔融特性的影响,有助于加深对锅炉结渣过程的理解,为燃用准东煤锅炉结渣防控提供技术支持.为获得烟气气氛对准东煤灰熔融特性的影响规律,建立了单热电偶高温显微观察系统(SHTT),比较了还原性气氛、氢化性气氛、惰性气氛及模拟烟气气氛下准东煤灰的熔融特性.结果 表明,建立的灰熔融温度测试方法精度较好,96.92％的灰样熔融温度与标准灰熔点仪测得的流动温度相比偏差在3％以内(≤40℃),最大偏差＜50℃,测试偏差在煤灰熔融特性测试允许误差范围内.当碱酸比R＜2.5时,气氛对灰熔融特性无显著影响;当R＞2.5时,煤灰组分中Fe2O3质量分数较高,导致还原性气氛下灰熔点降低.烟气中SO2对煤灰熔融温度的影响与煤灰组分相关,当R＞2.5时,煤灰中碱/碱土金属及硫(AAEM/S)质量分数较高,烟气中SO2会抑制煤灰中CaSO4的分解,提升高温下煤灰中CaO质量分数,并减少长石,辉石等低熔点矿物的生成,进而提升煤灰熔融温度.烟气中SO2是促进富含Na/Fe硫酸盐或硫化物超细颗粒生成及沉积的重要因素.
Author 刘青
吴玉新
史航
张海
吕俊复
姚伟
AuthorAffiliation 清华大学热科学与动力工程教育部重点实验室,北京100084%中国石油国际事业有限公司,北京100033%西安热工研究院有限公司,陕西西安710032
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LIU Qing
L(U) Junfu
ZHANG Hai
SHI Hang
WU Yuxin
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Keywords 煤灰熔融特性
准东煤
单热电偶高温显微观察系统(SHTT)
烟气气氛
SO2
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Title 烟气气氛对准东煤灰熔融特性影响的显微观察
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