Hydrodynamic modeling of gas-solids riser flows

Jun You, Rajesh Patel, Dawei Wang, Chao Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hydrodynamics plays a crucial role in optimum design and performance of circulating fluidized beds (CFB). The traditional approach of equating the static pressure drop to the bulk weight in a riser section overlook the effects of solids acceleration and kinetic energy dissipation due to solids collisions and inter facial frictions, which leads to an overestimation of local solids holdup. The overestimation of solids holdup is very significant in the acceleration and dense phase transport regions. This paper presents a mechanistic model based on gas-solid continuity and momentum equations, along with the modified drag force correlation and new formulation for moment dissipation of solids due to solids collisions. The proposed model yields the coupled hydrodynamic parameters of solid volume fraction, gas and solid velocity, and pressure distribution along the whole riser. The model predictions are reasonably validated against the published experimental data from four independent research groups for a wide range of operation conditions.

Original languageEnglish (US)
Title of host publicationAIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings
StatePublished - 2008
Event2008 AIChE Annual Meeting, AIChE 100 - Philadelphia, PA, United States
Duration: Nov 16 2008Nov 21 2008

Publication series

NameAIChE Annual Meeting, Conference Proceedings

Other

Other2008 AIChE Annual Meeting, AIChE 100
CountryUnited States
CityPhiladelphia, PA
Period11/16/0811/21/08

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

Keywords

  • Energy dissipation
  • Fluidization
  • Gas-solids flow
  • Solid acceleration

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