Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O<sub>2</sub>/CO<sub>2</sub> atmosphere

JI Haimin; XU Dangqi; LI Hongzhi; ZHAO Zhiping; XUE Ning; ZHOU Fei; NIE Jianping

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Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O₂/CO₂ atmosphere

Thermal Power Generation Vol. 45, Issue 10, Pages: 54-59(2016)

更新时间：2025-09-28

- Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O₂/CO₂ atmosphere
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK229
- Published：2016
- 稿件说明：
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JI Haimin, XU Dangqi, LI Hongzhi, et al. Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O₂/CO₂ atmosphere[J]. Thermal Power Generation, 2016, 45(10): 54-59.
DOI：

JI Haimin, XU Dangqi, LI Hongzhi, et al. Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O₂/CO₂ atmosphere[J]. Thermal Power Generation, 2016, 45(10): 54-59. DOI：

摘要

利用Fluent软件对330 MW机组四角切圆煤粉锅炉常规燃烧和富氧燃烧进行了数值模拟研究

对比分析了不同工况下炉膛中心温度、辐射力、O_2分布、CO浓度、NO_x浓度之间的差异。结果表明:在富氧燃烧时

当O_2体积分数为21%时

炉内的燃烧温度总体要低于常规空气气氛下的燃烧温度

即辐射力低于常规空气气氛

燃烧排放的CO_2浓度远远高于常规燃烧

NO_x生成量较常规燃烧也有一定程度降低;在富氧条件下

随着φ(O_2)/φ(CO_2)增加

炉内煤粉燃烧得到强化

燃烧速度加快

中心温度提高

辐射强度增大

NO_x生成量增多

烟气中CO_2浓度就越大

越易于收集利用。

Abstract

The Fluent software was applied to carry out numerical simulation on combustion of a 330 MW unit tangentially pulverized coal fired boiler in air(O_2/N2=21%/79%)and oxygen-enriched(O_2/CO_2=21%/79%

O_2/CO_2=25%/75%

O_2/CO_2=30%/70%

O_2/CO_2=35%/65%)atmosphere.The temperature in the furnace center area

the radiation intensity

the concentration distribution of O_2

and NO_xin different atmospheres were compared.The results show that

when the O_2 concentration is 21%

the furnace temperature during the oxygen-enriched combustion is lower than that during the air combustion

meaning the radiation intensity is weaker than that in the normal air atmosphere.The CO_2 emission in O_2/CO_2 atmosphere is much higher than that in the conventional air combustion.The NO_xformation is greatly lower than that in the air atmosphere.When the O_2/CO_2 ratio increases

the pulverized-coal combustion in the furnace gets stronger

leading to an acceleration in the combustion speed

thus the temperature in the furnace center area and the radiation intensity increases.Therefore

the NO_xformation and the CO_2 concentration grows

which makes the NO_xand CO_2 be easy to be captured.

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Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O2/CO2 atmosphere

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摘要

Abstract

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Numerical study on combustion characteristics of a tangentially fired pulverized-coal boiler in O₂/CO₂ atmosphere