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Objective Supersonic separation is a new gas purification and fuel gas processing technology based on contraction-expansion nozzle. The cyclone in the post-swirl supersonic separator is usually set in front of the diffuser section, which is easy to induce the positive shock wave and destroy the low temperature environment inside the separator. Moreover, the shock wave is difficult to control. Therefore, this study intends to reduce the impact of shock waves by optimizing the structure. Methods Firstly, based on the principles of thermodynamics and aerodynamics, a shock wave control theory for a rear-swirl supersonic separator was proposed. Secondly, according to the theory, a trans-swirl structure which could control shock waves was designed, and a universal design formula for the structure was established. Thirdly, through numerical simulation, the effects of three important structural parameters on the shock waves control were analyzed, namely, the dip angle of the trans-swirl structure, the length of the gradually expansion section and the twist angle of the cyclone blade. Results The separator had the best performance when the dip angle of the trans-swirl structure was set to 3.3°, the length of the gradual expansion section was set to 107 mm, and the blade torsion angle of the cyclone was set to 120°. Conclusions Compared with the traditional cyclone post-separator, the addition of the trans-swirl structure can ensure that the fluid flow area continues to increase in the gradual expansion section, thereby achieving effective control of shock waves and improving the condensation and separation efficiency. [ABSTRACT FROM AUTHOR]

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Foundry Technology (1000-8365) is the property of Foundry Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Storage & Process is the property of Tianjin Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

As an efficient zero-carbon energy source, hydrogen energy has great potential for future development. It is considered to be an important driving force for transforming new energy sources in the background of carbon neutrality. Because the hydrogen produced by the current mainstream hydrogen production method contains impurities, purification and separation technology is critical in using hydrogen energy. Pure hydrogen can be used in various industrial fields. This paper describes the impurity components contained in hydrogen-rich raw gas obtained by various hydrogen production technologies, and reviews the research status of five commonly used hydrogen purification technologies, such as pressure swing adsorption, low-temperature separation, metal hydride, membrane separation, and solvent absorption, as well as introduces the new hydrogen purification technology using a supersonic separation device. Meanwhile, this paper also analyzes the process flow, equipment, application conditions, purification effect, advantages and disadvantages of each hydrogen purification technology, and clarifies the challenges faced by each purification technology and current research hotspots. Finally, it summarizes various hydrogen purification technologies, and proposes the future development trend and research direction of hydrogen purification technology, which provides a valuable reference for obtaining optimizedly more efficient and economical hydrogen purification technology. [ABSTRACT FROM AUTHOR]

Copyright of Modern Food Science & Technology is the property of Editorial Office of Modern Food Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Geological Hazard & Control is the property of China Institute of Geological Environmental Monitoring (CIGEM) Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas & Oil is the property of Editorial Department of Natural Gas & Oil and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to remove the emulsified oil with an average diameter of 0. 1 ～ 2. 0 μm from produced water using electrocoagulation,the response surface methodology was used to optimize the process conditions. Whereafter,experiments prepared by simulated sewage and field sewage were conducted respectively to verify the accuracy of the models. According to the Box-Behnken design principle,three factors,including the angle of the plate,the current density,the electrolysis time,were investigated and the effects of their interactions on the oil removal and cost were also studied using the Design-Expert software. Subsequently,the oil removal and cost forecasted by established models were91. 28%,and 1. 25 RMB/m3,respectively,when the current density was 100 A/m2,the dip angle of the plate was73. 1°,and the power time was 19 min. The final removal under this optimum conditions was almost equal to the actual measured value,and yet,actual cost using field sewage is only 78. 4% of predicted value,which provides theoretical guidance for the development of electrocoagulation device and its industrial application in oil fields. [ABSTRACT FROM AUTHOR]