Numerical simulation on coal blending in a 330 MW unit boiler firing lean coal

WANG Xiaolong; ZHANG Feilong; WANG Li; LIU Xing; TAN Houzhang

doi:10.19666/j.rlfd.202106088

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Numerical simulation on coal blending in a 330 MW unit boiler firing lean coal

Thermal Power Generation Vol. 51, Issue 2, Pages: 112-116(2022)

更新时间：2025-05-30

- Numerical simulation on coal blending in a 330 MW unit boiler firing lean coal
- 作者机构：
  
  1. 神华神东煤炭集团有限责任公司
  2. 西安交通大学热流科学与工程教育部重点实验室
  3. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202106088
  CLC： TM621.2
- Published：2022
- 稿件说明：
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WANG Xiaolong, ZHANG Feilong, WANG Li, et al. Numerical simulation on coal blending in a 330 MW unit boiler firing lean coal[J]. Thermal Power Generation, 2022, 51(2): 112-116.
DOI：

WANG Xiaolong, ZHANG Feilong, WANG Li, et al. Numerical simulation on coal blending in a 330 MW unit boiler firing lean coal[J]. Thermal Power Generation, 2022, 51(2): 112-116. DOI： 10.19666/j.rlfd.202106088.

摘要

建立了贫煤锅炉配煤掺烧数值模型，对330 MW机组锅炉不同配煤掺烧方案进行计算，分析低氮燃烧模式下焦炭燃尽率的关键影响因素。结果表明：掺烧位置对燃尽率有显著影响，送入4层烟煤和2层贫煤时，随着贫煤送入高度上移，炉膛出口焦炭燃尽率由98.9%降低至98.2%；随着送入贫煤层数由1层增加至5层时，焦炭燃尽率由99.1%降低至97.2%，焦炭燃尽率随着贫煤掺烧比例增加而降低；送入小粒径贫煤层数由0层增加至5层时，焦炭燃尽率由97.6%增加至99.2%，而仅通过顶部2层一次风喷口送入小粒径贫煤，炉膛出口焦炭燃尽率即可达到98.9%。配煤掺烧数值模型能够模拟炉内配煤掺烧过程，获得煤粉锅炉炉内温度分布及飞灰含碳量的定量数据，为确定最优配煤掺烧方案提供指导。

Abstract

A numerical model of coal blending for boilers burning lean coal is established. Different coal blending schemes for a 330 MW unit boiler are calculated to analyze the key parameters influencing the char burnout ratio in low NOx combustion mode. The simulation results show that

the feeding height of lean coal has a significant impact on the burnout ratio. When two layers of meagre coal are burned with the other four layers of bituminous coal

the burnout ratio at the furnace outlet reduces from 98.9% to 98.2% as the height of lean coal layer increases.The burnout ratio decreases from 99.1% to 97.2% as the number of lean coal layer increases from 1 to 5

the burnout ratio decreases as the number of blended layer increases. When the number of blended layers of small-particle lean coal increases from 0 to 5

the char burnout ratio increases from 97.6% to 99.2%. However

the char burnout ratio can reach 98.9% when only the upper two layers of primary air nozzle are fed with small particle size lean coal. The coal blending numerical model can be used to simulate the in-furnace coal blending process. The quantitative data of furnace temperature distribution and fly ash carbon content can be obtained to provide guidance for determining the optimum coal blending strategy.

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