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多段变径结构提升管的输送和沉降特性.

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Title: 多段变径结构提升管的输送和沉降特性.
Alternate Title: Conveying and settling characteristics in a multi-section variable-diameter riser.
Authors: 董建宏1,2 dongjianhong@iet.cn, 齐晓宾1,2,3 qixiaobin@iet.cn, 朱治平1,2,4 zhuzhiping@iet.cn, 李新丽1,2, 张孝禹1
Source: Clean Coal Technology. 2025 Supplement, Vol. 31, p884-890. 7p.
Subject Terms: *Fluidized bed reactors, *Fluidization, *Pyrolysis, *Pulverized coal, *Coal gasification, *Pressure drop (Fluid dynamics), *Particle motion
Abstract (English): One circulating fluidized bed pyrolysis process of pulverized coal that couples the gasification of char was proposed. In order to achieve the physical zoning between pyrolysis and gasification inside the riser, cold-state experimental research was conducted on a circulating fluidized bed test rig. Through analyzing the pressure drop distribution inside the riser with a multi-section variable-diameter structure, the conveying and settling characteristics of the riser with such special structure were studied. It is found that the whole conveying process of solids can be divided into three stages: particle fluidization, particle conveying, and particle conveying completion. For the effective conveying of solids, the fluidization number in the lower isodiametric section shall be above 47.6. The middle-necking and upper-expanding structure of riser exhibits an excellent anti-settling performance. Only at the fluidization number below 25.2, the settling of solids in the upper-expanding section to the lower occurs. The gas expansion caused by multiple factors during the actual operation will enhance the conveying capacity of particles, making the achievement of effective conveying process at a lower airflow velocity. In this case, the particles inside the upper-expanding section are more prone to backmixing, resulting in the formation of local dense phase zone. This study will provide a theoretical basis for the design and optimization of the novel circulating fluidized bed pyrolysis reactor of pulverized coal. [ABSTRACT FROM AUTHOR]
Abstract (Chinese): 提出了一种耦合半焦气化的循环流化床煤粉热解工艺。为实现提升管内煤粉热解与半焦气化 过程的物理分区, 在循环流化床试验台上开展冷态试验研究, 通过分析不同流速下多段变径结构提升 管内的压降分布, 考察这种特殊结构提升管的物料输送和沉降特性。结果表明, 物料在提升管内的输 送过程可以划分为颗粒流化、颗粒输送和颗粒输送完成 3 个阶段, 为保障物料的有效输送, 下部等径段 的流化数应不低于 47.6;提升管中部缩径−上部扩径的结构具有良好的抗沉降特性, 在流化数低于 25.2 时, 上部扩径段内的物料才会沉降至下部; 在实际运行过程中, 由多种因素引起的气体膨胀会提升 颗粒输送能力, 使颗粒在更低的流速下实现有效输送, 在气体膨胀作用下, 上部扩径段内的颗粒更容易 发生返混现象, 形成局部密相区。本研究将为新型循环流化床煤粉热解反应器的设计和优化提供理论 基础。 [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191821337
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PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: 多段变径结构提升管的输送和沉降特性.
– Name: TitleAlt
  Label: Alternate Title
  Group: TiAlt
  Data: Conveying and settling characteristics in a multi-section variable-diameter riser.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22董建宏%22">董建宏</searchLink><relatesTo>1,2</relatesTo><i> dongjianhong@iet.cn</i><br /><searchLink fieldCode="AR" term="%22齐晓宾%22">齐晓宾</searchLink><relatesTo>1,2,3</relatesTo><i> qixiaobin@iet.cn</i><br /><searchLink fieldCode="AR" term="%22朱治平%22">朱治平</searchLink><relatesTo>1,2,4</relatesTo><i> zhuzhiping@iet.cn</i><br /><searchLink fieldCode="AR" term="%22李新丽%22">李新丽</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22张孝禹%22">张孝禹</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Clean+Coal+Technology%22">Clean Coal Technology</searchLink>. 2025 Supplement, Vol. 31, p884-890. 7p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Fluidized+bed+reactors%22">Fluidized bed reactors</searchLink><br />*<searchLink fieldCode="DE" term="%22Fluidization%22">Fluidization</searchLink><br />*<searchLink fieldCode="DE" term="%22Pyrolysis%22">Pyrolysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Pulverized+coal%22">Pulverized coal</searchLink><br />*<searchLink fieldCode="DE" term="%22Coal+gasification%22">Coal gasification</searchLink><br />*<searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Particle+motion%22">Particle motion</searchLink>
– Name: Abstract
  Label: Abstract (English)
  Group: Ab
  Data: One circulating fluidized bed pyrolysis process of pulverized coal that couples the gasification of char was proposed. In order to achieve the physical zoning between pyrolysis and gasification inside the riser, cold-state experimental research was conducted on a circulating fluidized bed test rig. Through analyzing the pressure drop distribution inside the riser with a multi-section variable-diameter structure, the conveying and settling characteristics of the riser with such special structure were studied. It is found that the whole conveying process of solids can be divided into three stages: particle fluidization, particle conveying, and particle conveying completion. For the effective conveying of solids, the fluidization number in the lower isodiametric section shall be above 47.6. The middle-necking and upper-expanding structure of riser exhibits an excellent anti-settling performance. Only at the fluidization number below 25.2, the settling of solids in the upper-expanding section to the lower occurs. The gas expansion caused by multiple factors during the actual operation will enhance the conveying capacity of particles, making the achievement of effective conveying process at a lower airflow velocity. In this case, the particles inside the upper-expanding section are more prone to backmixing, resulting in the formation of local dense phase zone. This study will provide a theoretical basis for the design and optimization of the novel circulating fluidized bed pyrolysis reactor of pulverized coal. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Chinese)
  Group: Ab
  Data: 提出了一种耦合半焦气化的循环流化床煤粉热解工艺。为实现提升管内煤粉热解与半焦气化 过程的物理分区, 在循环流化床试验台上开展冷态试验研究, 通过分析不同流速下多段变径结构提升 管内的压降分布, 考察这种特殊结构提升管的物料输送和沉降特性。结果表明, 物料在提升管内的输 送过程可以划分为颗粒流化、颗粒输送和颗粒输送完成 3 个阶段, 为保障物料的有效输送, 下部等径段 的流化数应不低于 47.6;提升管中部缩径−上部扩径的结构具有良好的抗沉降特性, 在流化数低于 25.2 时, 上部扩径段内的物料才会沉降至下部; 在实际运行过程中, 由多种因素引起的气体膨胀会提升 颗粒输送能力, 使颗粒在更低的流速下实现有效输送, 在气体膨胀作用下, 上部扩径段内的颗粒更容易 发生返混现象, 形成局部密相区。本研究将为新型循环流化床煤粉热解反应器的设计和优化提供理论 基础。 [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.13226/j.issn.1006-6772.CBJ25022702
    Languages:
      – Code: chi
        Text: Chinese
    PhysicalDescription:
      Pagination:
        PageCount: 7
        StartPage: 884
    Subjects:
      – SubjectFull: Fluidized bed reactors
        Type: general
      – SubjectFull: Fluidization
        Type: general
      – SubjectFull: Pyrolysis
        Type: general
      – SubjectFull: Pulverized coal
        Type: general
      – SubjectFull: Coal gasification
        Type: general
      – SubjectFull: Pressure drop (Fluid dynamics)
        Type: general
      – SubjectFull: Particle motion
        Type: general
    Titles:
      – TitleFull: 多段变径结构提升管的输送和沉降特性.
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            NameFull: 董建宏
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            NameFull: 齐晓宾
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            NameFull: 朱治平
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            NameFull: 李新丽
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            NameFull: 张孝禹
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              M: 12
              Text: 2025 Supplement
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              Y: 2025
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              Value: 31
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            – TitleFull: Clean Coal Technology
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