Emission forms of trace elements during oxygen-enriched combustion at high pressure

DONG Jinglan

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Emission forms of trace elements during oxygen-enriched combustion at high pressure

Thermal Power Generation Vol. 45, Issue 10, Pages: 50-53(2016)

更新时间：2025-09-28

- Emission forms of trace elements during oxygen-enriched combustion at high pressure
- 作者机构：
  
  华北电力大学电站设备状态监测与控制教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK16;TM621
- Published：2016
- 稿件说明：
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DONG Jinglan. Emission forms of trace elements during oxygen-enriched combustion at high pressure[J]. Thermal Power Generation, 2016, 45(10): 50-53.
DOI：

DONG Jinglan. Emission forms of trace elements during oxygen-enriched combustion at high pressure[J]. Thermal Power Generation, 2016, 45(10): 50-53. DOI：

摘要

利用化学热力学平衡软件FactSage

对富氧燃烧气氛不同系统压力下痕量元素(Hg、As)的排放形态进行了模拟计算。结果表明:Hg主要以Hg(g)、HgCl_2(g)、HgO(g)的形式存在

随着压力的提高

HgCl_2(g)转化区间的温度升高

HgO(g)的摩尔分数增大;As主要以AsO(g)、As4O6(g)、As_2O_5(s)的形式存在

随着压力的提高

As_2O_5(s)转化区间的温度升高。

Abstract

The chemical thermodynamic equilibrium software FactSage was used to simulate the emission forms of trace elements(Hg

As)during oxyfuel combustion at different pressures.The results show that

during the oxygen-enriched combustion of coal

Hg exists mainly in forms of Hg(g)

HgCl_2(g)and HgO(g).Especially

Hg exists completely in form of HgCl_2(g)at 400℃and Hg(g)above 700℃.With the increasing system pressure

the temperature corresponding to the conversion range of HgCl_2(g)to Hg(g)rises

and he maximum proportion of HgO(g)increases.The As mainly exists in forms of AsO(g)

As_4O_6(g)and As_2O_5(s)

it exists completely in form of As_2O_5(s)at 500℃and AsO(g)above 800℃.As4O6(g)only exists at temperature between 500 ℃ and 800 ℃.As the system pressure increases

the conversion range temperature of As_2O_5(s)to AsO(g)rises.

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