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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 25, 2019
Accepted July 14, 2020

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Modeling of the wet flue gas desulfurization system to utilize low-grade limestone

Jonghun Lim^{1 2} Yeongryeol Choi^{1 2} Geonyeol Kim^{1 2} Junghwan Kim^2†

¹Chemical and Biomolecular Engineering, Yonsei University, 50, Yonsei-ro, Seoul 03722, Korea ²Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, 55, Jonga-ro, Ulsan 44413, Korea

kjh31@kitech.re.kr

Korean Journal of Chemical Engineering, December 2020, 37(12), 2085-2093(9), 10.1007/s11814-020-0639-6

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Abstract

Wet flue gas desulfurization was simulated to improve gypsum production using low-grade limestone. High-grade limestone with 94 wt% CaCO3 content is used for producing gypsum with 93 wt% purity, but owing to the resource depletion of high-grade limestone, low-grade limestone should be replaced as an alternative. However, lowgrade limestone with CaCO3 purity of less than 94% contains impurities such as MgCO3, Al2O3, and SiO2, which reduce gypsum purity. To resolve this issue, a process involving mixing of both low-grade and high-grade limestone was simulated to predict the quantity of low-grade limestone that could be utilized. Many reactions like limestone dissolution, SOX absorption, and crystallization were considered and were simulated by different models in Aspen plus. For process optimization, the following constraints were set: 93 wt% gypsum purity, 94% desulfurization efficiency, and 3,710 kg/h total limestone usage, which maximized the mass flow of low-grade limestone. The maximum blending quantity of low-grade limestone for 2,100 kg high-grade limestone that satisfied the constraints was ~1,610 kg.

Keywords

Desulfurization Limestone Gypsum Simulation Flue Gas Optimization

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