STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION FROM COAL-FIRED BOILERS BASED ON BFA AND OFA

CHEN Sunhang; Zhou Zhijun; ZHANG Xiuxia; ZHOU Junhu; LIU Jianzhong; CEN Kefa State-level Key Laboratory of Energy Clean Utilization

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STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION FROM COAL-FIRED BOILERS BASED ON BFA AND OFA

更新时间：2025-09-28

- STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION FROM COAL-FIRED BOILERS BASED ON BFA AND OFA
- Thermal Power Generation Vol. 40, Issue 8, Pages: 12-16(2011)
- 作者机构：
  
  1. 浙江大学能源清洁利用国家重点实验室
  2. 浙江大学能源清洁利用国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK229.6
- Published：2011
- 稿件说明：
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CHEN Sunhang, Zhou Zhijun, ZHANG Xiuxia, et al. STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION FROM COAL-FIRED BOILERS BASED ON BFA AND OFA[J]. Thermal power generation, 2011, 40(8): 12-16.
DOI：

CHEN Sunhang, Zhou Zhijun, ZHANG Xiuxia, et al. STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION FROM COAL-FIRED BOILERS BASED ON BFA AND OFA[J]. Thermal power generation, 2011, 40(8): 12-16. DOI：

摘要

结合BFA和OFA技术

并采用计算流体软件FLUENT 6.3

选择合理的数学模型

对420t/h切圆燃烧锅炉炉内的流动、传热及燃烧进行了数值模拟。数值模拟采用三维稳态计算

SIMPLEC算法

湍流模型采用可实现k-ε双方程模型

NOx的生成采用后处理方法计算。计算结果表明

改造后炉膛中心温度降低

炉膛出口NOx排放量降低了约30%

炉膛出口的CO浓度接近零。但是

由于底部BFA二次风的直接扰动

使切圆直径增大

会造成锅炉结渣。因此

在改造过程中应适当减小下一次风截面的设计切圆直径。

Abstract

Combined with BFA and OFA technology

and adopting fluid calculation software FLUENT 6.3

selecting proper mathematic model

a numerical simulation of flow

heat transfer

and combustion in the furnace of a tangential firing 420 t/h boiler has been carried out.The said simulation adopts three-dimensional steady-state calculation and SIMPLEC algorithm

the turbulent model uses the double-equation realizable k-ε model

and the formation of NOx is calculated by using post-processing method.The results of calculation show that the temperature at center of the furnace decreases after retrofit

the NOx emission at exit of the furnace reduces about 30%

the concentration of CO at exit of the furnace is near to zero.However

owing to direct disturbance of the secondary air from BFA at the bottom

making the diameter of tangential circle to be enlarged

this phenomenon may result in slagging in the furnace.Therefore

in the process of retrofitting

the designed diameter of tangential circle at lower cross-section of the primary air has to be properly reduced.

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