多段变径循环流化床热解反应器提升管内颗粒返混和掺混特性研究

靳留勇; 齐晓宾; 董建宏; 朱治平

doi:10.12434/j.issn.2097-2547.20250456

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多段变径循环流化床热解反应器提升管内颗粒返混和掺混特性研究

更新时间：2026-04-27

- 多段变径循环流化床热解反应器提升管内颗粒返混和掺混特性研究
- Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor
- 低碳化学与化工 2026: 1-10.
- 作者机构：
  
  1.中国科学院工程热物理研究所煤炭高效低碳利用全国重点实验室，北京 100190
  2.中国科学院大学，北京 100049
  3.煤灵活燃烧与热转化山西省重点实验室，山西大同 037305
  4.山西省煤炭清洁高效燃烧与气化工程研究中心，山西大同 037305
- 作者简介：
  
  靳留勇（1997—），硕士研究生，研究方向为煤炭热解，E-mail：jinliuyong@iet.cn。
  齐晓宾（1990—），博士，副研究员，研究方向为碳基原料分质分级利用，E-mail：qixiaobin@iet.cn；
  朱治平（1979—），博士，正高级工程师，研究方向为高碳资源低碳利用，E-mail：zhuzhiping@iet.cn。
- 基金信息：
  
  国家重点研发计划(2023YFB4103803);中国科学院前瞻战略科技先导专项（A类）(XDA29020600);北京“高创计划”-青年人才托举工程(20251032)
- DOI：10.12434/j.issn.2097-2547.20250456
  中图分类号： TQ53
- 收稿：2025-11-30，
  
  修回：2026-01-07，
  
  网络首发：2026-04-24，
- 稿件说明：
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靳留勇,齐晓宾,董建宏等.多段变径循环流化床热解反应器提升管内颗粒返混和掺混特性研究[J].低碳化学与化工,

JIN Liuyong,QI Xiaobin,DONG Jianhong,et al.Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor[J].Low-Carbon Chemistry and Chemical Engineering,
靳留勇,齐晓宾,董建宏等.多段变径循环流化床热解反应器提升管内颗粒返混和掺混特性研究[J].低碳化学与化工, DOI：10.12434/j.issn.2097-2547.20250456.

JIN Liuyong,QI Xiaobin,DONG Jianhong,et al.Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor[J].Low-Carbon Chemistry and Chemical Engineering, DOI：10.12434/j.issn.2097-2547.20250456.

摘要

热解是实现低阶煤高值化利用的关键途径，其核心在于开发高效热解反应器。优化多段变径循环流化床热解反应器的提升管结构，可强化反应器内颗粒的返混和掺混效果。采用冷态实验方法，以粉煤和半焦为原料，研究了扩径结构和给煤喷口布置方式（切向、斜切和斜插）对颗粒流动特性的影响。结果表明，扩径结构可有效抑制颗粒浓度沿轴向的衰减。当扩径比为1.16和1.27时，热解区颗粒体积分数可提升15%~40%（与等径结构相比），进而促使该区域形成局部浓相区。当给煤喷口采用斜切布置时，煤粉与半焦的掺混效果最佳，固相中煤粉质量分数沿提升管轴向可维持在0.2左右，离散系数小于0.05。

Abstract

Pyrolysis is a critical pathway for the high-value utilization of low-rank coal

the core of which lies in the development of high-efficiency pyrolysis reactors. Optimizing the riser structure of the multi-stage variable-diameter circulating fluidized bed reactor can significantly enhance the backmixing and blending performance of particles. Cold-state experiments were conducted to investigate the effects of expanding section structures and coal injection nozzle arrangements (tangential

oblique-tangential and oblique-inserted) on particle flow characteristics via using pulverized coal and semi-coke as the raw materials. The results indicate that the expanding structure can inhibit the axial decay of solids concentration effectively. When expanding diameter ratio is 1.16 and 1.27

the particle volume fraction in the pyrolysis section can be increased by 15% to 40% (compared with the constant-diameter structure)

thereby promoting the formation of local dense-phase zones. When the oblique-tangential nozzle arrangement is employed

the optimal blending effect between pulverized coal and semi-coke is achieved

and the mass fraction of pulverized coal in the solid phase can remain stable at approximately 0.20 along the axial direction of riser

with coefficient of variation less than 0.05.

关键词

Keywords

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