Comparative simulation of air and oxygen-enriched combustion in a 300 MW tangentially fired pulverized coal boiler

LI Ning; GE Jianan; WANG Jiansheng

doi:10.19666/j.rlfd.202112244

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Comparative simulation of air and oxygen-enriched combustion in a 300 MW tangentially fired pulverized coal boiler

更新时间：2025-09-28

- Comparative simulation of air and oxygen-enriched combustion in a 300 MW tangentially fired pulverized coal boiler
- Thermal Power Generation Vol. 51, Issue 6, Pages: 122-131(2022)
- 作者机构：
  
  1. 河北省特种设备监督检验研究院沧州分院
  2. 天津大学机械工程学院(中低温热能高效利用教育部重点实验室)
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202112244
  CLC： TK229.63
- Published：2022
- 稿件说明：
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LI Ning, GE Jianan, WANG Jiansheng. Comparative simulation of air and oxygen-enriched combustion in a 300 MW tangentially fired pulverized coal boiler[J]. Thermal power generation, 2022, 51(6): 122-131.
DOI：

LI Ning, GE Jianan, WANG Jiansheng. Comparative simulation of air and oxygen-enriched combustion in a 300 MW tangentially fired pulverized coal boiler[J]. Thermal power generation, 2022, 51(6): 122-131. DOI： 10.19666/j.rlfd.202112244.

摘要

富氧燃烧作为一种清洁能源技术可用于锅炉改造，从而降低污染物排放，回收CO_2。为研究空气气氛下和富氧环境中炉膛燃烧的不同，采用数值模拟方法研究了亚临界300 MW机组四角切圆煤粉炉炉膛内燃烧的传热特性。通过调整O_2体积分数、进入炉膛的烟气比率以及一次风和二次风量，可以得到和空气气氛下燃烧相近的火焰温度。研究了7种工况下的炉膛流场、温度场、O_2、CO_2、CO体积分数分布，以及它们在炉膛横截面平均体积分数随炉膛高度变化。模拟结果表明：不论是在富氧燃烧还是空气气氛下燃烧，炉膛内的流场分布相似，但是在同样的O_2体积分数下下，将N2替换为CO_2后会使炉膛内温度下降，火焰中心下移；增加O_2体积分数可以改善传热特性，增加煤粉燃烧的稳定性。

Abstract

As a clean energy technology

oxygen-enriched combustion can be used in boiler renovation to reduce pollutant emissions and recover CO_2. To study the difference of furnace combustion between in air atmosphere and in oxygen-enriched environment

the heat transfer characteristics of combustion in furnace of a subcritical 300 MW tangentially fired pulverized coal furnace are studied by numerical simulation. By adjusting such parameters as the volume fraction of O_2

the volume fraction of flue gas entering the furnace

and the volume of primary air and secondary air

the flame temperature in oxygen-enriched atmosphere that is similar to that in air atmosphere is obtained. The change rules of flow field

temperature field

volume fraction of O_2

CO_2 and CO in the furnace under seven conditions

as well as the mean volume fraction of O_2

CO_2 and CO in cross-section of the furnace with the furnace height were investigated. The simulation results reveal that

the flow fields in the furnace are similar in both air and oxygen-enriched combustion atmospheres. However

with the same volume fraction of oxygen

replacing N2 with CO_2 will cause a decrease in the furnace temperature and make the flame center move down. Increasing the oxygen volume fraction can improve the heat transfer characteristics and make the pulverized coal combustion more stable.

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