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Study of the drying characteristics in an asymmetric impinging stream reactor

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Abstract

A short particle residence time results in inadequate and incomplete drying in impinging stream reactors. The fluid and particle motion process and temperature distribution in an asymmetric impinging stream reactor are studied and compared with those in a symmetric reactor, and the relationship between the drying characteristics and particle residence time is analysed. The research results show that the initial conditions of the particle and fluid and the geometric parameters of the reactor mainly determine the drying process and particle residence time in the high-temperature region. Reasonable settings of the factors v, Tm, Tp0, um, up0 and L/D and the particle position can greatly increase the particle residence time and ensure the completion of drying of the impinging stream reactor. Compared with the asymmetric impinging stream reactor with v = 0.7, the total residence time and the drying characteristics of the symmetric impinging stream reactor can be increased by 28.5% and 54.0%, respectively.

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Abbreviations

mp :

Particle mass, kg

Re:

Particle Reynolds number, -

V:

Inlet velocity ratio, s

Tm :

Fluid temperature, K

Tp :

Particle temperature, K

λm :

Fluid thermal conductivity, W/m·K

λp :

Particle thermal conductivity, W/m·K

Ap :

Particle area, m2

cp :

Heat capacity of a particle, J/kg·K

cp,g :

Heat capacity of fluid, J/kg·K

ttot :

Particle residence time in impinging stream reactor, s

t1 :

Particle residence time in the active area, s

t2 :

t2 = ttot -t1, s

t :

Tangential unit vector

ttota :

Lower value of ttot, s

ttotb :

Upper value of ttot, s

Nu:

Nusselt number

Pr:

Prandtl number

H:

Heat transfer coefficient, W/ m2·K

hfg :

Latent heat of vaporization, J/kg

n :

Normal unit vector

up0 :

Initial particle velocity, m/s

Vp :

Volume of particle, m3

Φ:

Outlet particle moisture content

φ0 :

Initial particle moisture content

Tp0 :

Initial particle temperature, K

σk:

Turbulent Prandtl number for k, -

σε:

Turbulent Prandtl number for ε, -

C:

Particle concentration, kg/m3

Sct :

Turbulent Schmidt number, -

Sh:

Sherwood number, -

Sc:

Schmidt number, -

K:

Mass transfer coefficient, m/s

Nt :

Molar flux of vapour, kg mol/m2·s

Ctp :

Vapour concentration at particle surface, kg mol/m3

Ctm :

Vapour concentration in gas phase, kg mol/m3

psat :

Saturation vapour pressure, Pa

Pop:

Operating pressure, Pa

Xi :

Local bulk mole fraction of vapour, -

dmp/dt:

Moisture evaporation rate, kg/s

Mw,i :

Molecular weight of water vapour, kg/kg mol

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Acknowledgements

This work was supported by science and technology project of Power Construction Corporation of China Ltd: Project No. DJ-ZDZX-2018-02.

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Authors and Affiliations

  1. Power Generation Branch, POWERCHINA Hubei Electric Engineering Corporation Limited, No.1 Xinqiaosi Road, Jinyinhu Street, Dongxihu District, Wuhan, 430040, China

    Song Yue

  2. School of Energy and Power Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China

    Xueqing Liu

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  1. Song Yue
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Yue, S., Liu, X. Study of the drying characteristics in an asymmetric impinging stream reactor. Chem. Pap. 75, 4355–4370 (2021). https://doi.org/10.1007/s11696-021-01681-0

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