Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model

Chao Dai; Fan Gu

doi:10.1016/j.cjche.2016.11.016

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Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model
- Chinese Journal of Chemical Engineering Issue 6, Pages: 712-721(2017)
- Affiliations：
  
  School of Energy and Environment, Southeast University,Nanjing,China,210096
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2016.11.016
  CLC：
- Published：2017
- Accepted：
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Chao Dai, Fan Gu. Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model[J]. Chinese Journal of Chemical Engineering, 2017, (6): 712-721.
DOI：

Chao Dai, Fan Gu. Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model[J]. Chinese Journal of Chemical Engineering, 2017, (6): 712-721. DOI： 10.1016/j.cjche.2016.11.016.

摘要

Abstract

A numerical model based on the Eulerian-Eulerian two-fluid approach is used to simulate the gasification of coal char inside an entrained flow gasifier. In this model

effects of thermophoresis of coal char particles are thoroughly investigated. The thermophoresis is due to the gas temperature gradient caused by absorpted heat of coal char gasification. This work

firstly

calculates the gas temperature gradient and thermophoretic force at 1100℃

1200℃

1300℃ and 1400℃ wall temperatures. Then

the changes of particle volume fraction and velocity in the gasifier are studied in the simulation with thermophoresis or not. The results indicate that considering the particle thermophoresis has some effects on the calculation of particle volume fraction in the gasifier

especially at wall temperature of 1400℃

and the maximum particle volume fraction variance ratio reaches up to 1.38% on wall surface of the gasifier. These effects are mainly caused by large gas temperature gradient along the radial direction of the gasifier. For the particle velocity

the changes are small but can be observable along radial direction of the gasifier

which has good agreement with the distributions of radial gas temperature gradient and thermophoretic force. These changes above may have certain effects on gasification reaction rates in this Eulerian model. So the change of gasification reaction rates in the simulation with thermophoresis or not is studied finally.

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