Experimental study on additives applied to against slagging of Zhundong coal

LI Yuhang; ZHANG Xilai; ZHANG Sen; YAO Wei

English

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Experimental study on additives applied to against slagging of Zhundong coal

Thermal Power Generation Vol. 46, Issue 9, Pages: 135-140(2017)

更新时间：2025-09-28

- Experimental study on additives applied to against slagging of Zhundong coal
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK227.2
- Published：2017
- 稿件说明：
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LI Yuhang, ZHANG Xilai, ZHANG Sen, et al. Experimental study on additives applied to against slagging of Zhundong coal[J]. Thermal Power Generation, 2017, 46(9): 135-140.
DOI：

LI Yuhang, ZHANG Xilai, ZHANG Sen, et al. Experimental study on additives applied to against slagging of Zhundong coal[J]. Thermal Power Generation, 2017, 46(9): 135-140. DOI：

摘要

针对锅炉燃用新疆准东高钠煤存在严重的结渣问题

本文通过一维火焰炉模拟实际燃烧环境

试验研究了多种添加剂的防结渣效果

并对其防结渣机理进行了分析。试验结果表明:试验所用的高岭土、黏土类矿物对缓解结渣有较好的效果

试验样品中添加剂添加比例达到3%以上时防结渣效果更明显;添加剂起作用的前提是将煤灰中钠、钙、铁等元素质量分数降低到合理水平

尤其是将煤灰中Na_2O质量分数降低到3%以下

且钙、铁元素质量分数不大幅增加;添加剂加入后煤灰中的硅铝比对防结渣也起重要作用

合理的硅铝比有利于使低熔点的钠、钾、钙等碱/碱土金属化合物形成熔点相对较高的硅铝酸盐

单纯提高煤灰中Al_2O_3质量分数防结渣效果不明显。

Abstract

To solve the serious coking and contamination problems occurred on heating surface of utility boilers firing Xinjiang Zhundong coal

a one-dimensional furnace was used to simulate the actual combustion environment and the anti-slagging effects of several additives were experimentally investigated.Moreover

the mechanism against slagging was also analyzed.The results show that

the kaolin and clay have better anti-slagging effect.There are two additives having great effect in against slagging and the proportion of practical application in utility boilers shall not be less than 3%.By appearance comparison and phase analysis of slag

it is found that the additives act when the content of Na

Ca and Fe is controlled in a reasonable level

especially the content of Na_2O is declined below 3% and there is no obvious increase in that of Ca and Fe.In addition

the SiO_2/Al_2O_3 ratio in coal ash with additives plays an important role in against slagging.A rational SiO_2/Al_2O_3 ratio helps alkali/alkaline metal compounds with low melting point to form high-melting-point aluminosilicate.Only increasing mass fraction of Al_2O_3 has no obvious effect on anti-slagging.

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