洁净煤技术

2020, v.26;No.128(04) 119-126

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卧式液态排渣旋风炉燃烧高碱煤试验研究
Experimental study on combustion of high alkali coal in horizontal liquid slag cyclone furnace

兰德辉;樊俊杰;张忠孝;胡兴雷;陈松林;
LAN Dehui;FAN Junjie;ZHANG Zhongxiao;HU Xinglei;CHEN Songlin;School of Architecture and Environment,University of Shanghai for Scinece and Technology;School of mechanical engineering,Shanghai Jiaotong University;School of Energy and Powering Engineering,University of Shanghai for Scinece and Technology;

摘要(Abstract):

我国新疆地区高碱煤储量巨大,但煤的原生矿物中含有大量Na、K等碱金属元素,导致目前新疆地区无法直接燃用该类煤种,许多电厂不得不掺烧其他煤种以满足锅炉正常运行,极大限制了其广泛利用。液态排渣旋风炉燃烧锅炉技术是一种使煤燃烧产生的大部分灰在旋风燃烧器内形成液态渣膜并从锅炉底部排出的锅炉技术,对于解决新疆高碱煤强沾污结渣问题具有一定优势。为研究液态排渣卧式旋风炉燃用新疆高碱煤液渣捕捉碱金属特性,在实验室条件下搭建液态排渣卧式旋风试验炉,并对新疆沙尔湖煤进行燃烧试验,对试验过程中在卧式液态排渣旋风试验炉内采集到的灰渣样进行SEM-EDS分析,根据其分析结果计算灰渣样中碱金属的固碱率,同时观察试验过程中炉膛内壁液渣的形成情况,测量炉内温度分布情况。结果表明:试验工况稳定后旋风炉内总体温度分布比较均匀,沙尔湖煤适用于液态排渣卧式旋风燃烧炉燃用,燃烧温度1 300℃时,旋风炉膛内开始形成液渣,升高燃烧温度,炉内液渣形成较为明显,卧式液态排渣旋风炉燃用高碱煤,炉内形成液渣时,液渣中Fe元素会黏结在硅铝酸盐颗粒表面,增加其黏性,加强烧结层捕获灰颗粒的能力,促进渣层生长;采用卧式液态排渣旋风炉燃用高碱煤能有效缓解炉膛内壁黏污、结渣问题,同时高温燃烧区相对于低温燃烧区缓解效果较为明显;卧式液态排渣旋风炉燃高碱煤时液渣对碱金属Na、K等的捕捉效率达50%以上,最高可达61.01%,高于自身固态灰、高温区添加高岭土对Na的捕捉效率。
In Xinjiang region of China,the reserves of high alkali coal are huge.However,the primary minerals of coal in this region contain a large amount of alkali metals such as Na and K,which results in that such coal types cannot be directly burned in Xinjiang.Many power plants have to mix other coal to meet the normal operation of the boiler,which greatly limits the extensive use of the coal.The boiler technology of liquid slag discharge cyclone furnace combustion is a boiler technology that causes most of the ash produced by coal combustion to form a liquid slag film in the cyclone burner and is discharged from the bottom of the boiler.It has certain advantages in solving the problem of strong contamination and slagging of high alkali coal in Xinjiang.In order to study the characteristics of capturing alkali metal in the liquid slag horizontal cyclone furnace by using Xinjiang high alkali coal liquid slag,in this paper,a liquid slag horizontal cyclone test furnace under laboratory conditions was built.And the combustion experiment of coal from Shaerhu in Xinjiang was carried out,and the ash sample collected in the horizontal liquid slag discharge cyclone test furnace during the experiment was analyzed by SEM-EDS,and the solid alkali rate of the alkali metal in the ash sample was calculated according to the analysis results.During the experiment,the formation of liquid slag on the inner wall of the furnace was observed and the temperature distribution in the furnace was measured and analyzed.The research results show that: after the test conditions are stable,the overall temperature distribution in the cyclone furnace is relatively uniform.Shaer Lake coal is suitable for liquid slag discharge horizontal cyclone combustion furnace. When the combustion temperature is1 300 ℃,liquid slag begins to form in the cyclone furnace.With the increase of the combustion temperature,the formation of liquid slag in the furnace is more obvious.When high alkali coal is used in the horizontal liquid slag discharge cyclone furnace and the liquid slag is formed in the furnace,the Fe element in the liquid slag will stick to the surface of the aluminosilicate particles and increase its viscosity and enhance the ability of the sintered layer to capture ash particles and promote the growth of the slag layer.The use of horizontal liquid slag discharge cyclone furnace with high alkali coal can effectively alleviate the problem of fouling and slagging on the inner wall of the furnace,and the mitigation effect of the high temperature combustion area is more obvious than that of the low-temperature combustion zone.When high alkali coal is burned in the horizontal liquid slag discharge cyclone furnace,the capture efficiency of the liquid slag to alkali metals Na and K can reach more than 50%,and the highest can reach 61%,which is higher than its own solid ash and the capture efficiency of Na by adding kaolin in high temperature area.

关键词(KeyWords): 高碱煤;卧式液态排渣旋风炉;固碱率;碱金属;捕捉效率
high alkali coal;horizontal liquid slag cyclone furnace;solid alkali rate;alkali metals;capture efficiency

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2018YFB0604101-01)

作者(Author): 兰德辉;樊俊杰;张忠孝;胡兴雷;陈松林;
LAN Dehui;FAN Junjie;ZHANG Zhongxiao;HU Xinglei;CHEN Songlin;School of Architecture and Environment,University of Shanghai for Scinece and Technology;School of mechanical engineering,Shanghai Jiaotong University;School of Energy and Powering Engineering,University of Shanghai for Scinece and Technology;

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DOI: 10.13226/j.issn.1006-6772.19042401

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