利用 CFD 建模,通过改变几何形状来改善流动和温度模式的均匀性,从而增强工业 NH3 氧化反应器的转化能力

IF 5.5 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Advances Pub Date : 2024-07-14 DOI:10.1016/j.ceja.2024.100629
Seyedeh Mina Amirsadat , Ahmad Azari , Mahdi Nazari , Mohammad Akrami
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引用次数: 0

摘要

背景工业反应器中流动和温度模式的优化对于实现高效、均匀的化学反应至关重要。本研究的主要目标是找出 NH3 氧化反应器性能可能需要改进的地方,并解决反应器内流动分布不均匀的问题。在本研究中,为了实现工业 NH3 氧化反应器催化剂表面性质分布的均匀性,通过垂直延伸进料管道和增加进料流的数量,改变了反应器建筑设计。因此,利用 CFD 方法和有限体积法,提出了一个三维模型。研究结果与实际几何结构进行了对比。通过扩大进料管道,反应器入口处的流动模式得到充分发展并变得均匀。因此,二氧化氮产量可提高 11%。因此,NH3 转化率、NO 产量和 HNO3 生成量分别增加了 12.5%、3.1% 和 8.0%。此外,这种变化还使催化剂表面的温度和压力分布均匀,延长了催化剂的使用寿命。数据还显示,在原始反应器配置下,催化剂表面的压力和温度差约为 250 Pa 和 423.15 K。随着进料管线长度的增加,压力和温度差分别降至 15 Pa 和 273.15 K。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Conversion augmentation of an industrial NH3 oxidation reactor by geometry modification to improve the flow and temperature pattern uniformity using CFD modeling

Background

The optimization of flow and temperature patterns in industrial reactors is crucial for achieving efficient and uniform chemical reactions. This study's major goals are to pinpoint possible areas for improvement in the NH3 oxidation reactor's performance and to deal with the problem of uneven flow distribution inside the reactor.

Methods

In this study, the reactor building design has been changed by extending the feed pipeline vertically and increasing the number of incoming feed streams in order to achieve uniformity in the property distribution on the catalyst surface of an industrial NH3 Oxidation reactor. Thus, using the CFD approach and the finite volume method, a three-dimensional model has been suggested. The results are contrasted with the actual geometrical configuration. The property alteration along the catalyst surface and the reactor length have been assessed.

Significant findings

By expanding the feed pipeline, the flow pattern at the reactor entry is fully developed and becomes uniform. As a result, NO2 production could go up by as much as 11 %. The rates of NH3 conversion, NO yield, and HNO3 generation consequently increased by 12.5 %, 3.1 %, and 8.0 %, respectively. Additionally, this alteration results in a uniform distribution of temperature and pressure across the catalytic surface, prolonging the lifetime of the catalyst. The pressure and temperature difference over the surface of the catalyst with the original reactor configuration was also found to be approximately 250 Pa and 423.15 K, according to the data. Pressure and temperature difference were reduced to 15 Pa and 273.15 K, respectively, as the feed line's length was increased at the same time.

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来源期刊
Chemical Engineering Journal Advances
Chemical Engineering Journal Advances Engineering-Industrial and Manufacturing Engineering
CiteScore
8.30
自引率
0.00%
发文量
213
审稿时长
26 days
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