Scholarlink

<p>The pyrolysis behavior exhibited during the coal partial gasification of circulating fluidized bed (CFB) indicates its potential to further increase the pyrolysis efficiency for tar production. To verify and reinforce it, the pyrolysis behaviors of this process at various factors including feeding position, oxygen concentration, and oxygen equivalence ratio were systematically investigated in a bench scale CFB. The distribution and physicochemical properties of gas, liquid, and solid products were focused and the evolution of pyrolysis products was thereby revealed. Experimental results show that raising the coal feeding position reduces the direct contact between coal particles and oxygen, creating a local reduction zone in the upper part of the riser, where the temperature drops sharply. This significantly enhances the pyrolysis effect through protecting the pyrolysis gas from oxidation. In this case, the produced tar is rich in monoaromatic hydrocarbons. Within the oxygen volume concentration range of 21%–33%, increasing the oxygen concentration of the gasifying agent shortens the oxygenated zone in the lower riser, further enhancing the pyrolysis effect. Reducing the oxygen equivalence ratio from 0.19 to 0.13 also results in a higher tar yield. In this study, the maximum tar weight yield reaches 4.97%, accounting for 72.81% of the total tar measured by Gray-King analysis. These results confirm the feasibility of tar production via coal partial gasification in a single CFB.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental Study on the Pyrolysis Characteristics during the Coal Partial Gasification in a Bench-Scale Circulating Fluidized Bed

  • 期刊论文

  • 发表日期：

    2025年12月16日

查看全文
  • Xinli Li,
  • Xiaobin Qi,
  • Zhiping Zhu,
  • Jianhong Dong,
  • Meiji Ye,
  • Xiaoyu Zhang,
  • Wentao Wang,
  • Xiaoyang Cao,
  • Haixia Zhang

摘要

The pyrolysis behavior exhibited during the coal partial gasification of circulating fluidized bed (CFB) indicates its potential to further increase the pyrolysis efficiency for tar production. To verify and reinforce it, the pyrolysis behaviors of this process at various factors including feeding position, oxygen concentration, and oxygen equivalence ratio were systematically investigated in a bench scale CFB. The distribution and physicochemical properties of gas, liquid, and solid products were focused and the evolution of pyrolysis products was thereby revealed. Experimental results show that raising the coal feeding position reduces the direct contact between coal particles and oxygen, creating a local reduction zone in the upper part of the riser, where the temperature drops sharply. This significantly enhances the pyrolysis effect through protecting the pyrolysis gas from oxidation. In this case, the produced tar is rich in monoaromatic hydrocarbons. Within the oxygen volume concentration range of 21%–33%, increasing the oxygen concentration of the gasifying agent shortens the oxygenated zone in the lower riser, further enhancing the pyrolysis effect. Reducing the oxygen equivalence ratio from 0.19 to 0.13 also results in a higher tar yield. In this study, the maximum tar weight yield reaches 4.97%, accounting for 72.81% of the total tar measured by Gray-King analysis. These results confirm the feasibility of tar production via coal partial gasification in a single CFB.