An Experimental Study on Ash Deposition and NO<sub>x</sub> Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion

ZHAO Lin; WANG Chang'an; SUN Ruijin; LUO Maoyun; CHE Defu

doi:10.7652/xjtuxb202308008

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An Experimental Study on Ash Deposition and NO_x Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion

更新时间：2025-05-08

- An Experimental Study on Ash Deposition and NO_x Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion
- Vol. 57, Issue 8, Pages: 76-85(2023)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202308008
  CLC： TK16
- Online First：10 August 2023，
  
  Published：2023
- 稿件说明：
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ZHAO Lin, WANG Chang'an, SUN Ruijin, et al. An Experimental Study on Ash Deposition and NO_x Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion[J]. 2023, 57(8): 76-85. DOI: 10.7652/xjtuxb202308008.
DOI：

ZHAO Lin, WANG Chang'an, SUN Ruijin, et al. An Experimental Study on Ash Deposition and NO_x Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion[J]. 2023, 57(8): 76-85. DOI: 10.7652/xjtuxb202308008. DOI：

摘要

为研究高碱煤在分级条件下的富氧燃烧行为

同时探究了高碱煤在该条件下的积灰行为与NO

生成规律。利用两段炉实验系统

首先对比了高碱煤在空气分级和富氧分级条件下的NO

生成和积灰情况

然后分析了富氧分级条件下总氧体积分数和主燃区氧体积分数的影响。结果表明

在氧体积分数均为21%时

富氧分级燃烧可以实现比空气分级燃烧更小的燃料氮转化率(6.8%、 9.6%)和更少的积灰量(62.4、147.3 mg)。富氧分级条件下

随着总氧体积分数的增加(15%～50%)

积灰量近似地线性增加

氧体积分数每增加10%

积灰约增加40 mg

燃料氮转化率也呈现上升趋势

但氧体积分数为15%～30%时变化较小。随着主燃区氧体积分数的增加(25%～60%)

燃料氮转化率和积灰质量均提高

主燃区氧体积分数每增加10%

积灰约增加21 mg。该研究表明

在研究高碱煤在分级条件下的富氧燃烧时

应同时关注NO

生成和积灰情况

这可以为促进高碱煤的清洁安全利用和碳减排事业提供更全面的信息。

Abstract

In order to study the staged oxy-fuel combustion behavior of high-alkali coal

the NO

generation and ash deposition of high-alkali coal in the staged oxy-fuel combustion were investigated simultaneously in this study. With the help of two-stage furnace system

the NO

generation and ash deposition of high-alkali coal in the staged oxy-fuel and air combustion were compared firstly

and then the effects of total oxygen content and oxygen content in the prima

ry combustion zone under the staged oxy-fuel condition were subsequently studied. The experimental results show that compared with the air-staged combustion

the smaller conversion ratio of fuel-nitrogen to NO(6.8%、9.6%)and the less deposited ash(62.4、147.3 mg)can be achieved in the staged oxy-fuel combustion when the oxygen contents were 21%. In the staged oxy-fuel combustion

the mass of ash deposit increases in an approximately linear way as the total oxygen content increases by 15%—50%. For each 10% increase in total oxygen content

the mass of ash deposit increases by about 40 mg. The conversion ratio of fuel-nitrogen to NO also shows an upward trend

but it changes slightly when oxygen content varies from 15% to 30%. With the oxygen content in the primary combustion zone increase by 25%—60%

both the conversion ratio of fuel-nitrogen to NO and mass of ash deposit increase. For each 10% increase in oxygen content in the primary combustion zone

the mass of ash deposit increases by about 21 mg. This study indicates that the NO

generation and ash deposition of high-alkali coal in the staged oxy-fuel combustion should be investigated simultaneously

which could provide comprehensive information for promoting the clean and safe utilization of high-alkali coal

as well as reducing the CO

emission.

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references

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An Experimental Study on Ash Deposition and NOx Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion

DOI：10.7652/xjtuxb202308008

摘要

Abstract

关键词

Keywords

references

An Experimental Study on Ash Deposition and NO_x Generation of High-Alkali Coal under the Condition of Staged Oxy-Fuel Combustion