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424 results on '"CAO Xuewen"'

1. Preparation of efficient hydrochloric acid corrosion inhibitor from natural grease

Author

Luo Yi, Xu Zhongying, Cao Xuewen, Wang Yefei, Li Shanjian, Chen Gang, and Tang Ying

Subjects
acidic corrosion, long chain fatty hydrazides, corrosion inhibitor, natural grease, Chemistry, QD1-999
Abstract

To alleviate the metal corrosion problem caused by incomplete acid discharge during pickling or acidification, a corrosion inhibitor, long chain fatty hydrazides (LCFH), with a significant corrosion inhibition effect was synthesized from natural grease. The corrosion inhibition and adsorption properties of LCFH on carbon steel in 1 M HCl solution were studied by static sample weight loss test, electrochemical impedance spectroscopy, and potentiodynamic polarization curve. The results showed that LCFH exhibits excellent corrosion inhibition performance in HCl solution. The inhibition efficiency increases with the increase of inhibitor concentration. When the concentration of LCFH is 40 mg/L, the inhibition efficiency can reach 97.9%. The potentiodynamic polarization curve shows that LCFH is a corrosion inhibitor that mainly inhibits the cathodic reaction. The corrosion inhibitor is spontaneously adsorbed on the surface of low-carbon steel in physical form, which conforms to the Langmuir isothermal adsorption model.

Published
2024
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2. Experimental study on foam drainage technology for removal of liquid accumulation in pipelines with undulating profiles

Author

ZHANG Pan, CAO Xuewen, LI Xiang, XIA Wenzhu, QIN Sisi, and BIAN Jiang

Subjects
pipeline with undulating profiles, foam drainage technology, liquid accumulation, inclination angle, flow characteristics, Oils, fats, and waxes, TP670-699, Gas industry, TP751-762
Abstract

[Objective] Pipelines with undulating profiles are susceptible to liquid accumulation at low-lying positions along their route,particularly when utilized for gathering and transmission of wet natural gas and transmission of oil-gas blends. Considering the significant difference in inclination angle between gathering and transmission pipelines and gas wells, foam drainage technology, already wellestablished for the removal of liquid accumulation from gas wells, needs to be further demonstrated before its application to transmission pipelines carrying oil-gas blends. [Methods] Gas-liquid multiphase pipe flow experiments were conducted using an experimental loop setup,aimed at investigating the impact of foam on the characteristics of gas-liquid multiphase flow at various inclination angles and elucidating the mechanism of plug formation in foam-containing multiphase flow. Additionally, the study examined the impact of changes in foam system properties induced by the presence of inorganic salts on the characteristics of foam-containing multiphase flow. Flow regime-specific analysis was conducted on flow characteristic parameters and pressure difference features. [Results] In pipelines with undulating profiles and significantly different inclination angles compared to gas wells, the addition of surfactant was found effective in removing accumulated liquid and mitigating the occurrence of sectional slugged flow conditions. To investigate the drainage effect of water-based Sodium Dodecyl Sulfate(SDS) foam under the influence of inorganic salts, a further study was conducted with the presence of NaCl and MgCl2 as environmental impact factors, and using metal grid sensors, a high-speed camera system, and pressure sensors. The findings revealed that the variation in foam properties resulting from the effect of inorganic salts had a substantial impact on the efficiency of foam drainage. Furthermore, it was observed that an excessive formation of stable foam within the pipeline caused a substantial increase in pressure drop along the route.[Conclusion] When applying foam drainage technology to gathering and transmission pipelines with liquid accumulation, stability becomes a critical factor in selecting an appropriate foam system. Further research should focus on investigating the relationship between the influence of the foam layer on the flow characteristics of the medium in pipelines and the overall performance of the foam system.

Published
2024
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3. Prediction of Mass Flow Rate in Supersonic Natural Gas Processing

Author

Wen Chuang, Cao Xuewen, Yang Yan, and Feng Yuqing

Subjects
Chemical technology, TP1-1185, Energy industries. Energy policy. Fuel trade, HD9502-9502.5
Abstract

The mass flow rate of natural gas through the supersonic separator was numerically calculated by various cubic equations of state. The numerical results show that the compressibility factor and specific heat ratio for ideal gas law diverge remarkably from real gas models at a high inlet pressure. Simultaneously, the deviation of mass flow calculated by the ideal and real gas models reaches over 10 %. The difference increases with the lower of the inlet temperature regardless of the inlet pressure. A higher back pressure results in an earlier location of the shock wave. The pressure ratio of 0.72 is the first threshold to get the separator work normally. The second threshold is 0.95, in which case the whole flow is subsonic and cannot reach the choked state. The shock position moves upstream with the real gas model compared to the ideal gas law in the cyclonic separation section.

Published
2015
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44. Gas Hydrate Exploitation Technology by Mixed Gas Replacement

Author

Cao, XueWen, Wang, HongChao, Yang, KaiRan, Shao, YanBo, Nan, ZiLong, Bian, Jiang, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Sun, Baojiang, editor, Sun, Jinsheng, editor, Wang, Zhiyuan, editor, Chen, Litao, editor, and Chen, Meiping, editor

Published
2022
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