Experimental analysis of T-abrupt exit’s pressure drop characteristics in riser

WANG Guilei; CHEN Yong; YAN Chaoyu; WEI Yaodong

doi:10.3969/j.issn.0438-1157.2014.02.027

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Experimental analysis of T-abrupt exit’s pressure drop characteristics in riser

更新时间：2025-12-10

- Experimental analysis of T-abrupt exit’s pressure drop characteristics in riser
- CIESC Journal Issue 2, Pages: 555-560(2014)
- 作者机构：
  
  中国石油大学(北京)重质油国家重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.02.027
  CLC： Q021
- Online First：05 February 2014，
  
  Published：05 February 2014
- 稿件说明：
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WANG Guilei, CHEN Yong, YAN Chaoyu, et al. Experimental analysis of T-abrupt exit’s pressure drop characteristics in riser[J]. CIESC Journal, 2014, (2): 555-560.
DOI：

WANG Guilei, CHEN Yong, YAN Chaoyu, et al. Experimental analysis of T-abrupt exit’s pressure drop characteristics in riser[J]. CIESC Journal, 2014, (2): 555-560. DOI： 10.3969/j.issn.0438-1157.2014.02.027.

摘要

在大型循环流化床装置上，以FCC催化剂颗粒为实验物料，针对提升管出口T型弯头用动态压力传感器测量了操作参数和结构尺寸变化对其压降的影响，系统地分析了T型弯头的压降特性。实验结果表明T型弯头的压降与颗粒浓度呈线性关系，与入口速度（提升表观气速）呈二次方关系；T型弯头出口管截面积的减小使得压降显著增大；T型弯头盲管高度的增加可使T型弯头的压降降低，但是当盲管高度增加到一定值时，压降减小不明显。盲管高度对压降的影响是由于盲管高度的增加改变了提升管上部压力的分布，使T型弯头入口压力减小，导致T型弯头的压降降低；同时盲管高度的增加也使提升管出口区域的负压约束区长度增加。盲管所形成的负压约束区构成了对提升管出口的约束作用，T型弯头的盲管高度越大负压约束区越长，约束作用越强。

Abstract

The pressure drop characteristics of T-abrupt exit of the riser were analyzed based on dynamic pressure data of gas-solids two-phase flow in a circulating fluidized bed equipment by using FCC catalyst particles

and varying the operation parameters and equipment dimensions. The pressure drop of T-abrupt exit changed linearly with inlet particle density

and quadratically with inlet gas velocity. It increased significantly with the decrease of outlet tube area of T-abrupt exit. Further

the pressure drop of T-abrupt exit decreased as blind tube length increased

but changed little above a specific length

because increased blind tube length changed the pressure distribution along the upper riser. As blind tube length increased

inlet pressure of T-abrupt exit decreased

hence pressure drop decreased. There was a negative pressure zone along the upper riser and blind tube

which constrained gas-solids two-phase flow in the riser. The longer the blind tube

the longer the negative pressure zone and the greater the constraint.

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