Numerical analysis on dynamics and heat transfer progress of a granulated molten slag particle by gas

Yiming FAN  Jingfu WANG

doi:10.12034/j.issn.1009-606X.218292

The Chinese Journal of Process Engineering >

2019 , Vol. 19 >Issue 4: 685 - 692

DOI: https://doi.org/10.12034/j.issn.1009-606X.218292

Flow & Transfer

Numerical analysis on dynamics and heat transfer progress of a granulated molten slag particle by gas

Yiming FAN Jingfu WANG

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1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, Beijing University of Technology, Beijing 100124, China 2. Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, Beijing University of Technology, Beijing 100124, China

Received date: 2018-10-08

Revised date: 2018-12-27

Online published: 2019-08-15

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Abstract

In order to investigate the dynamics and heat transfer progress and characteristics of granulated molten blast furnace slag by blast air, a mathematical model was established and solved through the fourth order Runge?Kutta algorithm, the calculation program was compiled by FORTRAN. Considering that the efficiency of air cooling was low, a method of spray cooling was presented to improve the cooling rate. And the effects of varied particle size on movement and cooling were also researched. The variations of main thermal physical properties of slag and air with temperature were taken into account during the calculation progress that in order to enhance reliability of the study. And the temperature recovery method was used to deal with the solidification of molten slag. The results indicated that the motion trail of the slag particle was parabolic curve after granulation, and velocity of the slag particle was firstly increased and then decreased by the influence of quenching gas during the flight, the cooling rate of slag particle was mainly influenced by the convective heat transfer coefficient which varied with the relative velocity of blast air and slag particle. Meanwhile, the cooling rate of slag particle was significantly improved due to the addition of spray because of the evaporation of droplet and enhancement of convective heat transfer. The final temperature of the slag particle reduced with the decreasing particle size, which meaned that the smaller particle size can make better cooling effect. And the motion parameters of the particle which had smaller size was more susceptible to the blast air. Generally, the smaller size of slag particle, the better of blast air cooling, and the smaller the space needed for granulation.

Key words： granulate molten slag; gas quenching; dynamics; heat transfer; numerical analysis

Cite this article

Yiming FAN Jingfu WANG . Numerical analysis on dynamics and heat transfer progress of a granulated molten slag particle by gas[J]. The Chinese Journal of Process Engineering, 2019 , 19(4) : 685 -692 . DOI: 10.12034/j.issn.1009-606X.218292

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