Simulation of Gas-Liquid-Solid Three-Phase Flow Process and Particle Removal Characteristics in Liquid Chamber of Scrubb
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Simulation of Gas-Liquid-Solid Three-Phase Flow Process and Particle Removal Characteristics in Liquid Chamber of Scrubbing Tower Y. Sun1 , J. Jiang1 , J. Li1* , B. Jiang1 , L. Zhang1 , D. He1 , Q. Kang1 , N. Yang1 , X. Tantai1 , and X. Xiao1 1
School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China Received January 16, 2019; in final form, June 4, 2020; accepted July 21, 2020
Abstract—In this study, the motion of three phases (gas, liquid, and solid) and characteristics of particle removal inside the liquid chamber of industrial scrubbing tower were studied through unsteady simulations using the VOF-DPM coupled model. The study focused on the motion of dust particles in a three-dimensional computational domain of 4200 × 8400 mm. After the system achieved stability, we obtained a chamber removal ability of 82.0% for a group of particles of different diameters, as well as removal ability for particles of different identical diameters. As the diameter grew from 10 μm to 500 μm, the dust removal efficiency increased from 23.1% to 97.2%. Moreover, the particle mass concentration along the height of the chamber was investigated. Based on prediction results, additional simulations were performed to investigate the effect of related parameters, including the inlet gas velocity and the initial liquid level height, on the dust-removal performance of the liquid chamber. The ideal operating parameters were identified, as playing a deciding role in appropriate industrial conditions. DOI: 10.1134/S1810232820030121
1. INTRODUCTION In the most recent years, the Chinese environmental authority has initiated a campaign to “declare war on pollution” because of the increasingly severe environmental problems, especially for many regions in northern China. One of the countermeasures is reduction of the use of scattered coal with its poor combustion efficiency and intensive emission of pollutants [1]. Therefore, development of efficient coalutilization technology is drawing increasing attention. For merits such as lower emission and higher efficiency, the coal gasification technology has occupied a leading place in the field of Clean Coal Technology (CCT) [2], which relates to the conversion of the combustible portion of coal into gaseous fuel, like CO, H2 , and CH4 , at high temperature and under high pressure [3]. Nevertheless, it is necessary to fully remove the fly ash produced in this process from the raw synthesis gas so as to facilitate the subsequent processing and utilization. For industrial applications, the scrubbing tower is chosen to clean syngas in order to reduce the concentration of fly ash to less than 1 mg/Nm3 [4]. As for the industrial scrubbing tower, the syngas enters into the chamber at the bottom first, where the direct contact of the syngas with the water leads to separation of a substantial amount of particles of large diameters. The role of the chamber in pre-dust-collection can make a significant difference in improving the overall scrubbing tower capability of dust removal. In plenty of the publ
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