Contamination characteristics of high sodium coal and its blends during combustion

CHEN Fanmin; WANG Jiarui; ZHANG Lei; HU Xianhui; WANG Baoyu; LI Xiaojiang

doi:10.19666/j.rlfd.202012301

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Contamination characteristics of high sodium coal and its blends during combustion

Thermal Power Generation Vol. 50, Issue 9, Pages: 107-111(2021)

更新时间：2025-09-28

- Contamination characteristics of high sodium coal and its blends during combustion
- 作者机构：
  
  华电电力科学研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202012301
  CLC： TQ534
- Published：2021
- 稿件说明：
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CHEN Fanmin, WANG Jiarui, ZHANG Lei, et al. Contamination characteristics of high sodium coal and its blends during combustion[J]. Thermal Power Generation, 2021, 50(9): 107-111.
DOI：

CHEN Fanmin, WANG Jiarui, ZHANG Lei, et al. Contamination characteristics of high sodium coal and its blends during combustion[J]. Thermal Power Generation, 2021, 50(9): 107-111. DOI： 10.19666/j.rlfd.202012301.

摘要

采用XRD、煤灰成分分析、数理统计和100 MW机组锅炉燃烧验证等方法对高钠煤及其混煤在燃烧过程中钠的迁移规律以及影响钠迁移的主要因素进行了研究

并提出了一种高钠煤及其混煤燃烧沾污性的预测方法。结果表明:在灰化温度高于500℃时

部分高钠煤中钠即存在明显挥发

而且Na_2O和Fe_2O_3质量分数的变化不是高钠煤中钠挥发的决定因素;高钠煤及其混煤中的CaO和Na_2O在高温燃烧下均能与硅铝氧化物反应生成硅铝酸盐

但两者存在明显的竞争关系

当CaO质量分数增加到一定比例时

会抑制钠硅铝酸盐的生成;高钠煤及其混煤灰中Na_2O质量分数小于7%时

SiO_2/CaO质量比大于4

高钠煤及其混煤为弱沾污性;SiO_2/CaO质量比在2～4之间时

为中沾污性;SiO_2/CaO质量比小于2时

为强沾污性;SiO_2/CaO比值越小

沾污性越强

其准确性和适应性得到了锅炉燃烧试验验证。

Abstract

The migration rule of sodium and its blends during the combustion

as well as the main affecting factors

were studied by X-ray diffraction (XRD)

coal ash composition analysis

mathematical statistics and combustion verification of 100 MW boiler.In addition

a prediction method for combustion contamination of high sodium coal and its blended coal was provided.The results indicated that

the sodium in some high sodium coal will volatilize obviously when the ashing temperature is higher than 500℃

and the change of mass fraction of Na_2O and Fe_2O_3 has little effect on release rate of sodium in high sodium coal.CaO and Na_2O in high sodium coal and its blended coal ash can react with aluminosilicates at high temperatures

but there is obvious competition between them.When the mass fraction of CaO increases to a certain degree

the formation of sodium aluminosilicates will be inhibited.When the mass fraction of Na_2O in high sodium coal and its blended coal ash is less than 7%

the mass ratio of SiO_2 to CaO is larger than 4

indicating the high sodium coal and its blends are weak contaminated.When the mass ratio of SiO_2 to CaO is 2～4

the high sodium coal and its blends are medium contaminated.When the mass ratio of SiO_2 to CaO is below 2

the high sodium coal and its blends are strong contaminated.The smaller the mass ratio of SiO_2to CaO is

the stronger the ash contamination is.The accuracy and adaptability of the proposed method are verified by the boiler combustion test.

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