Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor

JIN Liuyong; QI Xiaobin; DONG Jianhong; ZHU Zhiping

doi:10.12434/j.issn.2097-2547.20250456

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Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor

更新时间：2026-04-27

- Study on backmixing and blending characteristics of particles in riser of multi-section variable-diameter circulating fluidized bed pyrolysis reactor
- Pages: 1-10(2026)
- 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：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250456
  CLC： TQ53
- Received：30 November 2025，
  
  Revised：2026-01-07，
  
  Online First：24 April 2026，
- 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

references

LIU Q X , HE L , HUANG Y , et al . Pyrolysis characteristics of low-rank coal in pressurized fluidized bed under different atmospheres [J ] . Journal of Analytical and Applied Pyrolysis , 2025 , 191 : 107218 .

戴航 . 低阶煤热解工艺和应用进展 [J ] . 山东化工 , 2024 , 53 ( 24 ): 101 - 103 .

DAI H . Progress in low rank coal pyrolysis technology and application [J ] . Shandong Chemical Industry , 2024 , 53 ( 24 ): 101 - 103 .

XUE F F , LI D , GUO Y T , et al . Technical progress and the prospect of low-rank coal pyrolysis in China [J ] . Energy Technology , 2017 , 5 ( 11 ): 1897 - 1907 .

GAO J M , ZHANG L . Environmental regulation, market power and low-carbon development of China’s coal power industry chain—Based on both strategy and return perspectives [J ] . Energy Strategy Reviews , 2025 , 58 : 101651 .

WANG C A , GAO X Y , LIU C C , et al . Experimental investigation on physical and chemical properties of solid products from co-pyrolysis of bituminous coal and semi-coke [J ] . Journal of the Energy Institute , 2021 , 99 : 59 - 72 .

ZHANG Y , GAO N B , QUAN C , et al . Study on structural properties of semi-coke from pulverize coal pyrolysis and influencing factors during its thermal transportation process [J ] . Journal of Analytical and Applied Pyrolysis , 2023 , 173 : 106052 .

LIU T , ZHANG X L , LIU Y Z , et al . Directional preparation of naphthalene oil-rich tar from Beisu low-rank coal by low-temperature catalytic pyrolysis [J ] . Carbon Resources Conversion , 2020 , 3 : 67 - 75 .

YANG D E , XU B , SUN J H , et al . CO 2 -enhanced tar-rich coal pyrolysis to produce high-quality oil and CO-rich gas [J ] . Journal of Thermal Science , 2025 , 34 ( 4 ): 1554 - 1568 .

MA Z H , WEI X Y , LIU G H , et al . Value-added utilization of high-temperature coal tar: A review [J ] . Fuel , 2021 , 292 : 119954 .

CHE Y J , SHI K M , CUI Z H , et al . Conversion of low temperature coal tar into high value-added chemicals based on the coupling process of fast pyrolysis and catalytic cracking [J ] . Energy , 2023 , 264 : 126169 .

LIU Y Q , YAO Q X , SUN M , et al . Catalytic fast pyrolysis of coal tar asphaltene over zeolite catalysts to produce high-grade coal tar: An analytical Py-GC/MS study [J ] . Journal of Analytical and Applied Pyrolysis , 2021 , 156 : 105127 .

WALID B , HASSIBA B , BOUMEDIENE H , et al . Improved design of the Lurgi reactor for methanol synthesis industry [J ] . Chemical Engineering & Technology , 2018 , 41 ( 10 ): 2043 - 2052 .

冉伟利 , 张志刚 , 樊英杰 , 等 . 块煤中低温热解技术开发应用及研究方向 [J ] . 煤化工 , 2014 , 42 ( 2 ): 10 - 14 .

RAN W L , ZHANG Z G , FAN Y J , et al . Development status and trend of low temperature pyrolysis technology of lump coal [J ] . Coal Chemical Industry , 2014 , 42 ( 2 ): 10 - 14 .

崔阳 . 粉煤热解技术的研究现状及展望 [J ] . 能源化工 , 2018 , 39 ( 2 ): 33 - 38 .

CUI Y . Research status and prospects on pyrolysis technologies of the pulverized coal [J ] . Energy Chemical Industry , 2018 , 39 ( 2 ): 33 - 38 .

LI Q S , LIN Y K . Exergy analysis of the LFC process [J ] . Energy Conversion and Management , 2016 , 108 : 348 - 354 .

ATWOOD M T , SCHULMAN B L . The toscoal process-pyrolysis of western coals and lignites for char and oil production [J ] . Chemical Society Division of Fuel Chemistry Preprints , 2017 , 22 ( 2 ): 233 .

郭树才 , 罗长齐 , 张代佳 . 褐煤固体热载体干馏新技术工业性试验 [J ] . 大连理工大学学报 , 1995 , 35 ( 1 ): 46 - 50 .

GUO S C , LUO C Q , ZHANG D J . Experiment in pilot plant of new technology for lignite retorting using solid heat carrier [J ] . Journal of Dalian University of Technology , 1995 , 35 ( 1 ): 46 - 50 .

WANG Z A , WANG Z , WANG T . Research progress on heat effects of coal pyrolysis process [J ] . Journal of Analytical and Applied Pyrolysis , 2024 , 183 : 106827 .

LIU C J , LU J Y , ZHENG F , et al . Molecular structure model construction and pyrolysis mechanism study on low-rank coal by experiments and ReaxFF simulations [J ] . Journal of Analytical and Applied Pyrolysis , 2024 , 178 : 106387 .

GAO Y , SUN L Y , TIAN Y Y . Pyrolysis characteristics and product distribution of low-rank coal with heat-carrying particles adopting TG-FTIR and a novel self-mixing down tube reactor [J ] . Case Studies in Thermal Engineering , 2024 , 54 : 104041 .

JIANG Y , ZONG P J , MING X , et al . High-temperature fast pyrolysis of coal: An applied basic research using thermal gravimetric analyzer and the downer reactor [J ] . Energy , 2021 , 223 : 119977 .

TIAN B , QIAO Y Y , BAI L , et al . Pyrolysis behavior and kinetics of the trapped small molecular phase in a lignite [J ] . Energy Conversion and Management , 2017 , 140 : 109 - 120 .

胡勋 , 范梦娇 . 热解温度和热解停留时间对半焦性质的影响 [J ] . 中国粉体技术 , 2025 , 31 ( 4 ): 151 - 159 .

HU X , FAN M J . Effects of pyrolysis temperature and residence time on char properties [J ] . China Powder Science and Technology , 2025 , 31 ( 4 ): 151 - 159 .

HU G X , FAN H J , LIU Y Q . Experimental studies on pyrolysis of Datong coal with solid heat carrier in a fixed bed [J ] . Fuel Processing Technology , 2001 , 69 ( 3 ): 221 - 228 .

QUAN S M , SHI L , ZHOU B , et al . Study of temperature variation of walnut shell and solid heat carrier and their effect on primary pyrolysis and volatiles reaction [J ] . Fuel , 2021 , 292 : 120290 .

郭志航 . 褐煤热解分级转化多联产工艺的关键问题研究 [D ] . 杭州 : 浙江大学 , 2015 .

GUO Z H . Research on the key issues of lignite pyrolysis-based staged conversion polygeneration technology [D ] . Hangzhou : Zhejiang University , 2015 .

刘琦 . 双流化床中煤热解-气化工艺试验研究 [D ] . 北京 : 中国科学院工程热物理研究所 , 2009 .

LIU Q . Experimental study on coal pyrolysis-gasification processing in dual fluidized beds [D ] . Beijing : Institute of Engineering Thermophysics, Chinese Academy of Sciences , 2009 .

ZHANG X Y , QI X B , GAO S H , et al . An experimental investigation on gasification-pyrolysis coupling characteristics of pulverized coal in circulating fluidized bed [J ] . Journal of the Energy Institute , 2024 , 116 : 101751 .

LI X L , QI X B , ZHU Z P , et al . Experimental study on the pyrolysis characteristics during the coal partial gasification in a bench-scale circulating fluidized bed [J ] . Journal of Thermal Sciences , 2025 , 35 : 203 - 214 .

董建宏 , 齐晓宾 , 朱治平 , 等 . 多段变径结构提升管的输送和沉降特性研究 [J ] . 洁净煤技术 , 2025 , 31 ( S2 ): 884 - 890 .

DONG J H , QI X B , ZHU Z P . Study on conveyance and sedimentation characteristics in a multi-stage variable diameter riser [J ] . Clean Coal Technology , 2025 , 31 ( S2 ): 884 - 890 .

刘清华 , 杨朝合 , 赵辉 , 等 . 变径提升管内颗粒流动特性的研究 [J ] . 石油化工 , 2009 , 38 ( 1 ): 40 - 45 .

LIU Q H , YANG C H , ZHAO H , et al . Solid flow pattern in changing-diameter riser of a circulating fluidized bed [J ] . Petrochemical Technology , 2009 , 38 ( 1 ): 40 - 45 .

祝晓琳 , 李春义 , 杨朝合 , 等 . 变径提升管反应器扩径段内固含率分布研究 [J ] . 石化技术与应用 , 2013 , 31 ( 3 ): 181 - 184+188 .

ZHU X L , LI C Y , YANG C H , et al . Study on solids concentration distribution in the diameter-enlarged section of a novel riser reactor [J ] . Petrochemical Technology & Application , 2013 , 31 ( 3 ): 181 - 184+188 .

甘洁清 , 赵辉 , 李春义 , 等 . 多流型新型提升管冷模实验研究 [J ] . 石油学报（石油加工） , 2012 , 28 ( 2 ): 188 - 194 .

GAN J Q , ZHAO H , LI C Y , et al . Cold model experimental study of a novel multi-regime riser [J ] . Acta Petrolei Sinica (Petroleum Processing Section) , 2012 , 28 ( 2 ): 188 - 194 .

任福权 . 循环流化床二次风射流的研究现状 [J ] . 节能技术 , 2011 , 29 ( 1 ): 68 - 72 .

REN F Q . Status research of the circulating fluidized bed secondary air jet [J ] . Energy Conservation Technology , 2011 , 29 ( 1 ): 68 - 72 .

张曜 , 林晨 , 于娟 , 等 . 循环流化床二次风射流及床料粒径对流化特性的影响 [J ] . 洁净煤技术 , 2020 , 26 ( 3 ): 68 - 74 .

ZHANG Y , LIN C , YU J , et al . Influence of secondary air jet and bed materials size of circulating fluidized bed on the fluidization characteristic [J ] . Clean Coal Technology , 2020 , 26 ( 3 ): 68 - 74 .

黄卫星 , 石炎福 , 祝京旭 . 上行气固两相流充分发展段的颗粒浓度 [J ] . 化工学报 , 2001 , 52 ( 11 ): 963 - 968 .

HUANG W X , SHI Y F , ZHU J X . Solids holdups of gas solid two-phase upward flow in fully developed region of CFB riser [J ] . Journal of Chemical Industry and Engineering (China) , 2001 , 52 ( 11 ): 963 - 968 .

漆小波 , 曾涛 , 黄卫星 , 等 . 上行气固两相流充分发展段的摩擦压降及颗粒浓度预测 [J ] . 四川大学学报（工程科学版） , 2006 , 38 ( 1 ): 49 - 53 .

QI X B , ZENG T , HUANG W X , et al . The predictions of pressure drop and solids holdup in fully developed region of CFB risers [J ] . Journal of Sichuan University (Engineering Science Edition) , 2006 , 38 ( 1 ): 49 - 53 .

林海波 , 孔春林 , 黄卫星 . 气固循环流化床提升管颗粒速度和浓度的测量技术 [J ] . 四川轻化工学院学报 , 2002 , 15 ( 4 ): 28 - 33 .

LIN H B , KONG C L , HUANG W X . Measurement techniques of solids concentration and solids velocity in circulating fluid beds riser [J ] . Journal of Sichuan Institute of Light Industry and Chemical Technology , 2002 , 15 ( 4 ): 28 - 33 .

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