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Hydrate formation in oil–water systems: Investigations of the influences of water cut and anti-agglomerant

Chinese Journal of Chemical Engineering 2020年第2期28卷 369-377页

作者： Guangchun Song Yuxing Li Wuchang Wang Kai Jiang Zhengzhuo Shi Shupeng Yao Shandong Province Key Laboratory of oil-Gas Storage and Transportation Safety China University of PetroleumQingdao 266580China

To investigate the characteristics of hydrate formation in oil–water systems, a high-pressure cell equipped with visual windows was used where a series of hydrate formation experiments were performed from natural gas + diesel oil + water systems at different water cuts and anti-agglomerant concentrations. According to the temperature and pressure profiles in test experiments, the processes of hydrate formation under two kinds of experimental procedures were analyzed first. Then, based on the experimental phenomena observed through the visual windows, the influences of water cut and anti-agglomerant on the places of hydrate formation and distribution, hydrate morphologies and hydrate morphological evolvements were investigated. Hydrate agglomeration, hydrate deposition and hydrate film growth on the wall were observed in experiments. Furthermore, three different mechanisms for hydrate film growth on the wall were identified. In addition, the influences of water cut and anti-agglomerant on the induction time of hydrate formation were also studied.

关键词： Hydrates Formation oil–water system water cut Anti-agglomerant

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Improvement to anti-rust property of hot rolled rebar by compact oxide scale

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Journal of Central South University 2017年第12期24卷 2813-2818页

作者： CHEN Qing-an LIU Li-zhong LIU Xin LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China College of Mechanical and Equipment Engineering Hebei University of Engineering Handan 056038 China School of Material and Metallurgy Northeastern University Shenyang 110819 China Research Academy Northeastern University Shenyang 110819 China

A method was proposed to improve the anti-rust property of hot rolled rebar, which uses oil–water emulsion cooling instead of water cooling after hot rolling. The experiments were carried out by two cooling methods, one cooled by water, the other cooled by oil–water emulsion. The results of wet/dry cyclic accelerated corrosion test showed that the anti-rust property of rebar cooled by oil–water emulsion was better than that by water obviously. The results of OM, SEM and EPMA analysis indicated that these two scales contained three layers: an outer Fe_3O_4 layer, an intermediate Fe O layer with island-shaped pro-eutectoid Fe_3O_4, an inner eutectoid Fe_3O_4 layer. For the water cooled rebar, all three layers of oxide scale were relatively thin. Moreover, the scale had plenty of defects such as porosity, and crack. However, for the oil–water emulsion cooled rebar, all three layers of oxide scale were relatively thick and compact, which played an important role in protecting the rebar from atmospheric rust.

关键词： hot rolled rebar anti-rust property compact oxide scale oil–water emulsion cooling

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