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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 September 17, 2018
Accepted November 25, 2018

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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Design evaluation of diesel-oxygen diffusion flame burner for start-up of high-pressure coal gasifier

Jong-Keun Park Changkook Ryu^† Sung Ho Lee¹ Woohyun Jung²

School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea ¹Combustech Co. Ltd., Seoul 08506, Korea ²Plant Engineering Center, Institute for Advanced Engineering, Yongin 17180, Korea

Korean Journal of Chemical Engineering, March 2019, 36(3), 404-410(7), 10.1007/s11814-018-0197-3

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Abstract

Commercial entrained-flow coal gasifiers operate at high temperatures and pressures for increased efficiency. For reduced operation costs, the start-up burner (SUB) of a gasifier requires fast heating and pressurization by intensive combustion, minimizing damage to the refractory lining and to itself. We evaluated different designs of the SUB adopting diesel-oxygen diffusion flame under the stoichiometric condition to improve the performance of the existing premixed flame burner that has been subjected to frequent failures. Using computational fluid dynamics, the combustion characteristics of the SUB with a thermal input up to 2.28MWth and pressure up to 8 bar were predicted for tests in a pilot-scale cylindrical gasifier. The results showed that the injection of diesel and oxygen through separate multiple inlets can intensify the combustion, leading to short and stable turbulent diffusion flames. Varying the design of the burner tip and inlet arrangement reduced the influence of pressure on the flame length while achieving high heat flux to the wall, which is essential for a fast and stable start-up. Further investigations are required to understand the influence of the reactor geometry on the circulation flow of high-temperature gas back to the burner tip in the actual gasifier.

Keywords

Diesel Turbulent Diffusion Flame Coal Gasifier Start-up Burner

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