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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 February 17, 2012
Accepted April 27, 2012

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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Simultaneous removal of H2S and COS using Zn-based solid sorbents in the bench-scale continuous hot gas desulfurization system integrated with a coal gasifier

Young Cheol Park Sung-Ho Jo Ho-Jung Ryu Jong-Ho Moon Chang-Keun Yi^† Yongseung Yoon¹ Jeom-In Baek²

Greenhouse Gas Research Center, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 305-343, Korea ¹Center for Plant Engineering, Institute for Advanced Engineering, 5, Weoncheon-dong, Yeongtong-gu, Suwon 443-749, Korea ²Green Growth Laboratory, Korea Electric Power Corporation Research Institute, 65, Munji-ro, Yuseong-gu, Daejeon 305-380, Korea

Korean Journal of Chemical Engineering, December 2012, 29(12), 1812-1816(5), 10.1007/s11814-012-0059-3

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Abstract

A bench-scale continuous hot gas desulfurization system using Zn-based solid sorbents was developed to remove H2S and COS simultaneously in a 110 Nm3/h of real coal-gasified syngas. The bench-scale unit, which consisted of a fast fluidized-bed type desulfurizer and a bubbling fluidized-bed type regenerator, was integrated with a 3 ton/day-scale coal gasifier installed at the Institute for Advanced Engineering. The solid sorbents, which consisted of 50 wt% of ZnO for sulfides sorption and 50 wt% of supporters for mechanical strength, were manufactured by a_x000D_ spray drying method and supplied by Korea Electric Power Corporation Research Institute. The bench-scale unit was designed to operate at the high temperature of above 500 ℃ and the high pressure of 19 kgf/cm2 gauge. Integration of the bench-scale unit with a coal gasifier was first performed to investigate the operation stability of the integrated system. And the long-term continuous operation above 30 h was performed to analyze the desulfurization performance of the_x000D_ bench-scale unit. The concentration of both H2S and COS in the syngas was measured by a continuous UV gas analyzer and an online gas chromatograph and that of both H2S and COS after desulfurization was measured by an online gas chromatograph. Through the above 30-h continuous operation, the sulfur removal reached up to 99.9%.

Keywords

Hot Gas Desulfurization Solid Sorbents Bench-scale Unit Integration with a Coal Gasifier IGCC

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