Experimental study on sodium release characteristics during thermal conversion of high-alkali coal

LIAO Weihui; RAO Yong; LYU Xingcheng; RUAN Zhilong; FU Yongqiang; LI Huahong; CHEN Duan; MA Shuai; YAO Bin; ZHAO Yongchun

doi:10.19666/j.rlfd.202309164

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Experimental study on sodium release characteristics during thermal conversion of high-alkali coal

更新时间：2025-09-28

- Experimental study on sodium release characteristics during thermal conversion of high-alkali coal
- Thermal Power Generation Vol. 53, Issue 1, Pages: 82-90(2024)
- 作者机构：
  
  1. 广东红海湾发电有限公司
  2. 湛江中粤能源有限公司
  3. 华中科技大学能源与动力工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202309164
  CLC： TQ530.2
- Published：2024
- 稿件说明：
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LIAO Weihui, RAO Yong, LYU Xingcheng, et al. Experimental study on sodium release characteristics during thermal conversion of high-alkali coal[J]. Thermal power generation, 2024, 53(1): 82-90.
DOI：

LIAO Weihui, RAO Yong, LYU Xingcheng, et al. Experimental study on sodium release characteristics during thermal conversion of high-alkali coal[J]. Thermal power generation, 2024, 53(1): 82-90. DOI： 10.19666/j.rlfd.202309164.

摘要

为研究高碱煤热转化过程中钠的释出特性，采用原煤和水萃取煤分别进行燃烧实验和热解实验来对比分析高碱煤和低碱煤中钠的释出特性，探究不同煤质的煤样在燃烧时煤样中不同赋存形态钠的释出特性变化以及气氛变化对钠释出的影响。结果表明：在进行燃烧实验时，高碱煤在300～500℃时钠的释出量增加缓慢，在500～1 100℃时钠的释出量增加较快，低碱煤在300～500℃时钠的释出量增加较快，在500～1 100℃时钠的释出量增加缓慢，由此可知煤质是影响钠释出的主要原因之一，钠的释出特性会因煤质中成分差异而受到较大影响；燃烧和热解2种不同气氛下钠释出特性相似，热解过程中钠释出率变化平缓，且热解过程中钠释出率会比燃烧过程低7.0%左右；有机钠和水溶性钠2种不同赋存形态钠因释出途径不同而导致释出特性有所差异。

Abstract

In order to study release characteristics of sodium during thermal conversion of high-alkali coals

the release characteristics of sodium in high-sodium coal and low-sodium coal were compared and analyzed through combustion experiments and pyrolysis experiments of raw coal and water-washed coal

so as to explore the release law changes of different forms of sodium in coal samples during combustion and the influence of atmosphere changes on sodium release. The results show that

during the combustion experiment

the release of sodium from high-alkali coal increases slowly at 300～500 ℃ and rapidly at 500～1 100 ℃

and the release of sodium from low-alkali coal increases rapidly at 300～500 ℃ and slowly at 500～1 100 ℃. It can be seen that

coal quality is one of the main reasons affecting sodium release

and sodium release will be greatly affected by the difference in coal composition. The release law of sodium during combustion and pyrolysis is basically the same

the sodium release rate changes slowly during the pyrolysis process

and is about 7.0% lower than that of the combustion process. The release characteristics of organic sodium and water-soluble sodium are different due to different release routes.

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