Physico-chemical characterization of slag waste from coal gasification syngas plants: Effect of the gasification temperature on slag waste as construction material

Bongjin Jung; Seung-Jong Lee; Sungkyu Lee; Nayeon Lee; Wonjun Nam; Yongseung Yun

doi:10.3139/120.111072

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Physico-chemical characterization of slag waste from coal gasification syngas plants: Effect of the gasification temperature on slag waste as construction material

Bongjin Jung , Seung-Jong Lee , Sungkyu Lee , Nayeon Lee , Wonjun Nam und Yongseung Yun

Veröffentlicht/Copyright: 28. August 2017

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Abstract

The ash fusion temperature determines the suitability of coal for the entrained flow gasification/combustion process. For this purpose, Indonesian KPU coal samples and their ash and slag contents were comprehensibly characterized via X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and inductively coupled plasma optical emission spectrometry (ICP-OES) methods. To assess their environmental impacts, leachate solutions were prepared from the discharged slag for ICP-OES analyses. The experimental data were comprehensively explained in terms of ash fusion temperatures and fluidity properties of the coal ashes. More specifically, the coal slagging behavior inside of coal gasifier/combustors necessitated optimization of the operational conditions for subsequent mild slagging. The currently used coal gasification operation temperature ranges favored mild slagging at 1200 to 1300 °C (19.9 to 20.1 bar) and incomplete slagging at 1100 to 1200 °C (19.7 to 20.4 bar), which was attributed to the insufficient gasification/combustion temperature for the coal samples under the latter gasification/combustion conditions. The metallic elemental composition analysis results via ICP-OES performed on the leachate solution therefrom excluded the possibility of secondary environmental pollution from the discharged slag.

Kurzfassung

Die Aschefusionstemperatur bestimmt die Eignung von Kohle für den Vergasungs- bzw. Verbrennungsprozess. Zu diesem Zweck wurden indonesische Kohleproben und ihre Asche- und Schlackegehalte umfassend mittels verschiedener Verfahren der Röntgenfluoreszenzspektroskopie (XRF), Röntgendiffraktometrie (XRD), Rasterelektronenmikroskopie mit energiedispersiver Spektroskopie (REM/EDX) und induktiv gekoppelter optischer Plasma-Emissionspektrometrie (ICP-OES) untersucht. Um ihre Wirkung auf die Umwelt abzuschätzen, wurden Auslaugungslösungen aus der sich abgesetzten Schlacke für die ICP-OES Analysen präpariert. Die experimentellen Daten werden im vorliegenden Beitrag umfassend erklärt, und zwar unter dem Aspekt der Aschefusionstemperaturen und der Fluiditätseigenschaften der Kohleaschen. Mehr spezifisch erforderte das Kohleschlackenverhalten innerhalb der Kohlevergasungsanlagen eine Optimierung der Betriebsbedingungen für ein nachfolgendes mildes Verschlacken notwendig. Die zurzeit verwandten Bereiche der Kohlevergasungsbetriebstemperaturen befürworteten eine milde Verschlackung bei 1200bis1300 °C (19.9bis20.1bar) und unvollständige Verschlackung bei 1100 bis 1200 °C (19.7bis20.4bar), was auf die nicht ausreichende Vergasungs- bzw. Verbrennungstemperatur für die Kohleproben unter den genannten Vergasungs- bzw. Verbrennungsbedingungen zurückgeführt wurde. Die metallische und elementare Analyse der Zusammensetzung, die mittels ICP-OES an der Auslaugungslösung durchgeführt wurde, schloss daher die Möglichkeit einer sekundären Umweltverschmutzung durch die Schlacke aus.

*Correspondence Address, Dr. Sungkyu Lee, Principal Engineer, Plant Engineering Division, Institute for Advanced Engineering, 175-28 Goan-ro 51 beon-gil, Yongin-si, 17180, South Korea, E-mail: sklee@ajou.ac.kr

Prof. Bongjin Jung, born 1956, received his BSc and MSc degrees in Chemical Engineering from Hanyang University of Seoul, Korea, and Korea Advanced Institute of Science and Technology, Daejeon, Korea in 1980 and 1983, respectively. His PhD was conferred in Energy and Environmental Engineering at Pennsylvania State University, University Park, Pennsylvania, USA, in 1990. He is currently Professor at the Department of Environmental and Energy Engineering at University of Suwon, Hwasung-si, Gyeonggi-do, Korea.

Dr. Seung-Jong Lee, born 1966, received his BSc and MSc degrees in Chemistry and Organic Chemistry from Yonsei University, Seoul, Korea in 1988 and 1990, respectively. His PhD was conferred in Systems Engineering at Ajou University, Suwon, Korea, in 2002. Now, he is working as a principal engineer at the Plant Engineering Division, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Dr. Sungkyu Lee, born 1959, received his BSc degree from Hanyang University of Seoul, Korea, in 1982. He graduated with an MSc degree and PhD in Materials Science and Engineering from University of Minnesota at Twin Cities, USA, in 1991 and 1994, respectively. Now, he is working as a principal engineer at the Plant Engineering Division, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Nayeon Lee, born 1974, received her BSc, MSc and PhD degrees in Environmental Engineering from University of Suwon, Hwasung-si, Korea, in 1997, 2007, and 2014, respectively. She is currently working as a senior principal researcher and team manager at the Center for Environmental and Clean Technologies, University of Suwon, Hwasung-si, Gyeonggi-do, Korea.

Wonjun Nam, born 1982, received his BSc and MSc degrees in Environmental Engineering from University of Suwon, Hwasung-si, Korea, in 2007 and 2009, respectively. Now, he is working as an assistant manager at the Production Innovation Team, Daesang Corporation, Seoul, Korea. In addition, he has successfully completed his PhD program at the University of Suwon, Hwasung-si, Korea, except for submitting his dissertation.

Dr. Yongseung Yun, born 1957, received his BSc degree in Chemical Engineering from Yonsei University, Seoul, Korea, in 1979. His MSc and PhD degrees were conferred in the field of Chemical Engineering at Korea Advanced Institute of Science and Technology, Daejeon, Korea and University of Utha, Salt Lake City, Utah, USA, in 1981 and 1990, respectively. He is currently working as Director at the Plant Engineering Division, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

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Published Online: 2017-08-28

Published in Print: 2017-09-01

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https://doi.org/10.3139/120.111072