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耐火壁发射率对燃气蒸汽裂解中试装置能源效率的影响

The Effect of Refractory Wall Emissivity on the Energy Efficiency of a Gas-Fired Steam Cracking Pilot Unit.

作者信息

Vangaever Stijn, Van Thielen Joost, Hood Jeremy, Olver John, Honnerovà Petra, Heynderickx Geraldine J, Van Geem Kevin M

机构信息

Laboratory for Chemical Technology, Ghent University, Technologiepark 125, 9052 Ghent, Belgium.

CRESS B.V., Deltahoek 34, 4511 PA Breskens, The Netherlands.

出版信息

Materials (Basel). 2021 Feb 12;14(4):880. doi: 10.3390/ma14040880.

DOI:10.3390/ma14040880
PMID:33673312
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7918708/
Abstract

The effect of high emissivity coatings on the radiative heat transfer in steam cracking furnaces is far from understood. To start, there is a lack of experimental data describing the emissive properties of the materials encountered in steam cracking furnaces. Therefore, spectral normal emissivity measurements are carried out, evaluating the emissive properties of refractory firebricks before and after applying a high emissivity coating at elevated temperatures. The emissive properties are enhanced significantly after applying a high emissivity coating. Pilot unit steam cracking experiments show a 5% reduction in fuel gas firing rate after applying a high emissivity coating on the refractory of the cracking cells. A parametric study, showing the effect of reactor coil and furnace wall emissive properties on the radiative heat transfer inside a tube-in-box geometry, confirms that a non-gray gas model is required to accurately model the behavior of high emissivity coatings. Even though a gray gas model suffices to capture the heat sink behavior of a reactor coil, a non-gray gas model that is able to account for the absorption and re-emission in specific bands is necessary to accurately model the benefits of applying a high emissivity coating on the furnace wall.

摘要

高发射率涂层对蒸汽裂解炉中辐射热传递的影响远未得到充分理解。首先，缺乏描述蒸汽裂解炉中所涉材料发射特性的实验数据。因此，开展了光谱法向发射率测量，评估了高温下在耐火耐火砖上涂覆高发射率涂层前后的发射特性。涂覆高发射率涂层后，发射特性显著增强。中试装置蒸汽裂解实验表明，在裂解单元的耐火材料上涂覆高发射率涂层后，燃料气燃烧率降低了5%。一项参数研究表明了反应器盘管和炉壁发射特性对盒式管内辐射热传递的影响，证实需要采用非灰气体模型来准确模拟高发射率涂层的行为。尽管灰气体模型足以捕捉反应器盘管的热沉行为，但要准确模拟在炉壁上涂覆高发射率涂层的益处，需要一个能够考虑特定波段吸收和再发射的非灰气体模型。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4001/7918708/8f45e43b657b/materials-14-00880-g014a.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4001/7918708/359df43a0294/materials-14-00880-g008.jpg
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