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<p>To study the combustion behavior of municipal solid waste (MSW) in blast furnace, the combustion process within the raceway was simulated using computational fluid dynamics. Based on the parameters of an actual blast furnace, a three-dimensional model including coal lance, blowpipe, tuyere, and raceway was established. The model was then used to compare the combustion characteristics of pulverized coal and MSW in the raceway and to investigate the effects of blast temperature and particle size on the combustion characteristics of MSW in the raceway. The results showed that MSW combusted more rapidly, achieving a maximum temperature of 3839&#xa0;K in the raceway, comparing to 2974&#xa0;K during pulverized coal injection. However, the average temperature during MSW injection was 1790&#xa0;K, which was 73&#xa0;K lower than that of pulverized coal injection. The maximum velocity during MSW injection was 120&#xa0;m/s, lower than 188&#xa0;m/s obtained during pulverized coal injection. MSW could be completely burned out in the middle of the raceway, while the burnout of pulverized coal at this position was only 50%. The combustion effect of MSW makes no difference when the blast temperature increased from 1273 to 1673&#xa0;K, due to its excellent combustion characteristic. When the MSW particle size was increased from 0.074 to 2&#xa0;mm, the burnout was 75%, which was still higher than that of pulverized coal injection with a particle size of 0.074&#xa0;mm. However, injecting larger-sized fuel might increase the risk of tuyere wear. To ensure stable furnace conditions and great combustion, a blast temperature of 1473&#xa0;K and a MSW particle size of about 1&#xa0;mm will be better.</p>

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Numerical simulation of combustion behaviors of pulverized municipal solid waste in raceway of blast furnace

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Yu-feng Qiao,
  • Guang Wang,
  • Zhen-feng Zhou,
  • Jing-song Wang,
  • Qing-guo Xue

摘要

To study the combustion behavior of municipal solid waste (MSW) in blast furnace, the combustion process within the raceway was simulated using computational fluid dynamics. Based on the parameters of an actual blast furnace, a three-dimensional model including coal lance, blowpipe, tuyere, and raceway was established. The model was then used to compare the combustion characteristics of pulverized coal and MSW in the raceway and to investigate the effects of blast temperature and particle size on the combustion characteristics of MSW in the raceway. The results showed that MSW combusted more rapidly, achieving a maximum temperature of 3839 K in the raceway, comparing to 2974 K during pulverized coal injection. However, the average temperature during MSW injection was 1790 K, which was 73 K lower than that of pulverized coal injection. The maximum velocity during MSW injection was 120 m/s, lower than 188 m/s obtained during pulverized coal injection. MSW could be completely burned out in the middle of the raceway, while the burnout of pulverized coal at this position was only 50%. The combustion effect of MSW makes no difference when the blast temperature increased from 1273 to 1673 K, due to its excellent combustion characteristic. When the MSW particle size was increased from 0.074 to 2 mm, the burnout was 75%, which was still higher than that of pulverized coal injection with a particle size of 0.074 mm. However, injecting larger-sized fuel might increase the risk of tuyere wear. To ensure stable furnace conditions and great combustion, a blast temperature of 1473 K and a MSW particle size of about 1 mm will be better.