Impact of Industrial Heat Exchanger on Flow Regime Identification in Bubble and Slurry Bubble Columns for Fischer Tropsch Application

IF 1.3 4区工程技术 Q3 CHEMISTRY, ORGANIC

Petroleum Chemistry Pub Date : 2024-05-23 DOI:10.1134/s0965544124020105

Dalia S. Makki, Hasan Sh. Majdi, Amer A. Abdulrahman, Abbas J. Sultan, Bashar J. Kadhim, Zahraa W. Hasan

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Abstract

To improve the design and scale-up processes of bubble column reactors (BCRs), it is necessary to characterize the hydrodynamics by means of flow regime behavior. This study examines the impact of industrial heat exchangers and superficial gas velocities on flow regimes, pressure drop, and gas holdup in BC and SBC. A simulated Fischer–Tropsch bubble column is constructed. The experimental study utilized a Perspex column with a diameter of 0.14 m. Moreover, 18 copper tubes with a 0.16 m diameter are fitted into the bubble column. The selection of tubes in SBC was carried out in accordance with TEMA recommendations to ensure optimal heat dissipation. These tubes were made to resemble the industrial Fischer–Tropsch reactor by covering 25% of the bubble column’s cross-sectional area. In order to enhance the measurement and comprehension of the hydrodynamics within the reactor, this study employs a method measured the total gas hold-up and detected pressure fluctuations using three differential pressure transducers (Keller type PA 21Y/4). The column was equipped with a perforated plate air distributor, and glass beads were used as the solid phase. The gas distributor is constructed of porous polyethylene with pore sizes of 0.5 mm and plate thicknesses of 3 mm. To comprehend and assess the impact of tube configuration on the pressure drop; gas holdup; and regime transition velocities, the experimental data were recorded across a broad range of superficial gas velocities (i.e., 0.036–0.27 m/s). The findings suggest that higher superficial gas velocities result in amplified pressure fluctuations, with a recorded increase of 0.108 to 0.15 bar in pressure drop at a gas velocity of 0.27 m/s in the air-water system. Equipping the bubble/slurry bubble column with an industrial heat exchanger to the bubble/slurry bubble column resulted in a modest increase in pressure drop of around 0.042 bar, which disrupted the uniform flow and delayed regime transitions. Furthermore, the inclusion of solids leads to a 10% decrease in gas holdup, while the heat exchanger only slightly improves it by 5%. Drift flux analysis is a helpful tool for determining transition points. In the case of U-shaped heat exchanger tubes, the transition velocities can be altered by 1.7 m/s in BC. The results of this investigation will offer an exhaustive understanding of fluid dynamics as well as guidance in the design of reactors for extremely exothermic processes.

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工业热交换器对费托合成应用中气泡和浆液气泡塔中流态识别的影响

摘要为了改进气泡塔反应器（BCR）的设计和放大过程，有必要通过流态行为来描述流体动力学特征。本研究探讨了工业热交换器和表面气体速度对 BC 和 SBC 中的流态、压降和气体截留的影响。构建了一个模拟费托气泡塔。此外，气泡塔中还安装了 18 根直径为 0.16 米的铜管。SBC 中铜管的选择是根据 TEMA 建议进行的，以确保最佳散热效果。这些管子覆盖了气泡塔横截面积的 25%，与工业费托反应器相似。为了加强对反应器内流体力学的测量和理解，本研究采用了一种测量总气体截留的方法，并使用三个压差传感器（凯勒 PA 21Y/4 型）检测压力波动。色谱柱配备了一个穿孔板空气分配器，并使用玻璃珠作为固相。气体分配器由多孔聚乙烯制成，孔径为 0.5 毫米，板厚为 3 毫米。为了理解和评估管道配置对压降、气体滞留和制度转换速度的影响，实验数据记录了广泛的表层气体速度范围（即 0.036-0.27 m/s）。研究结果表明，表层气体速度越高，压力波动越大，在空气-水系统中，气体速度为 0.27 米/秒时，压降增加了 0.108 至 0.15 巴。在气泡/浆液气泡塔中配备一个工业热交换器，会使压力降略微增加约 0.042 巴，从而破坏均匀流动并延迟体系转换。此外，固体的加入导致气体滞留率降低了 10%，而热交换器仅略微改善了 5%。漂移通量分析是确定过渡点的有用工具。在 U 型换热管的情况下，过渡速度在 BC 值上可改变 1.7 m/s。这项研究的结果将有助于全面了解流体动力学，并为设计用于极端放热过程的反应器提供指导。

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来源期刊

Petroleum Chemistry 工程技术-工程：化工

CiteScore

2.50

自引率

21.40%

发文量

102

审稿时长

6-12 weeks

期刊介绍： Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.