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Wang Q.,Yangtze University | Wang Q.,China Petroleum Technology and Development Corporation | Xiao J.F.,SJ Petroleum Machinery Company
Applied Mechanics and Materials | Year: 2013

The framework is the main load bearing part of beam pumping unit. Its vibration performance has an important effect on the stability and reliability of beam pumping unit. This article takes the beam pumping unit (API C-228D-173-74) as an example, carries out the modal analysis in the environment of Solidworks Simulation, and obtains the first 6 orders of modal shapes and natural frequencies of the prestressed framework. This article clarifies the key technology of how to build the solid modal and how to apply load and constraints. The analysis result of the modal shows that the lowest frequency of the pumping unit framework (API C-228D-173-74) is 22.39Hz, which may be most likely resonant with the motor. We can adjust the rotate speed of the motor to avoid resonance. At the same time, the stiffness of the front legs is insufficient, suitable strengthen measures should be taken. © (2013) Trans Tech Publications, Switzerland.

Wang F.,Beijing University of Chemical Technology | Zhao Y.,Beijing University of Chemical Technology | Yang O.,Beijing University of Chemical Technology | Cai J.,China Petroleum Technology and Development Corporation | Deng M.,Beijing University of Chemical Technology
Journal of Loss Prevention in the Process Industries | Year: 2013

HAZOP analysis is a process hazard analysis method that has been widely applied both within and outside the chemical processing industries. This paper presents a design method for a process safety data management program for petrochemical plants based on HAZOP analysis and demonstrates the steps of application involved in building a process safety data management system for an ethylene oxide/ ethylene glycol production plant. Firstly, the production data files and relevant documents of the plants should be classified and stored in the program database as reference documents and treatment schemes for coping with abnormal situations should be collected and summarized as guidance documents. Secondly, the HAZOP analysis method is employed to identify all the dangerous deviations possibly existing in the production process of the ethylene oxide/ethylene glycol plant. Then, the relationships among the deviations, the reference documents and the guidance documents should be considered and evaluated. Finally, each dangerous deviation will be given a corresponding reference document and guidance document. The reference documents and guidance documents stored in the expert system can be utilized to help operators solve the corresponding technical problems and cope with abnormal situations. The process safety data management program will contribute to the identification, analysis and resolution of operation problems. When an abnormal situation occurs, according to the deviations exhibited in the system, the necessary reference documents and guidance documents will be quickly consulted by the operators, and an appropriate decision will be made to address the abnormal situation. Therefore, by using the process safety data management program, plant security and human safety in the petrochemical industries will be improved. © 2013 Elsevier Ltd.

Xu S.,China University of Petroleum - Beijing | Zhang Y.,China University of Petroleum - Beijing | Duan M.,China University of Petroleum - Beijing | Dai B.,China Petroleum Technology and Development Corporation
Key Engineering Materials | Year: 2016

This paper investigated the performance of single-lap joints with interfacial crack through the finite element method. The finite element method was validated by the G-R solutions at first. And then the influence of geometric parameter of the joint as well as the length of the interfacial crack were discussed. Results showed that the presence of a spew fillet can reduced the stress intensity factors (SIF).The relationship of the crack length ratio and SIF, adhesive thickness ratio and SIF were built. © (2016) Trans Tech Publications, Switzerland.

Kuang Y.,Southwest Petroleum University | Wu L.,Chengdu Jiuding Technology Group Co. | Tu J.,China Petroleum Technology and Development Corporation | Wu Y.,Petrochina | Dong Z.,Southwest Petroleum University
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2016

In order to reduce the machining error of complex helical surface, this paper studied the algorithm about tool path of envelope milling by transforming the dynamic meshing relationship into the space geometry problems between milling-cutter and workpiece through time discretization and spatial discretization in machining process based on numerical simulation method. We build three-dimensional model of milling-cutter and workpiece surface of revolution, deduce the coordinate-transformation matrix of meshing relationship between milling-cutter and workpiece, simplify the minimal directed distance between millingcutter and workpiece into a two-dimensional problem, set up the simulation algorithm of tool-path of milling-cutter and finally get the parameter information of NC codes. The machining process programmed on the obtained parameters proved to be able to produce the helical surface with required precision. Error distribution of the profile and its influencing factors are studied too. © 2016, Science Press. All right reserved.

Sun Y.-F.,University of Alberta | Li J.-H.,Xiamen University | Cui L.,University of Alberta | Hua B.,University of Alberta | And 4 more authors.
Nanoscale | Year: 2015

To date, most investigations of Ni-Fe bimetallic catalysts for solid oxide fuel cells (SOFCs) have focused on materials with micro-scale particle sizes, which severely restrict their catalytic activity. In this study, we fabricated a Ni- and/or Fe-doped A-site-deficient LaSrCrO3 perovskite (A-LSC) bimetallic anode material on which the in situ exsolution of uniformly dispersed nano Ni, Fe and Ni-Fe alloy with an average particle size of 25 to 30 nm was facilitated by the introduction of A-site deficiency under a reducing atmosphere. The dopants were shown to significantly enhance the electrical conductivity of the material by many orders of magnitude. Further characterization of the bimetallic material showed that the addition of Fe changed the reduction behavior and increased the amount of oxygen vacancies in the material. Fuel cell performance tests demonstrated that the prepared bimetallic anode catalyst with a highly catalytically active nano Ni-Fe alloy promoted the electrochemical performance in 5000 ppm H2S-syngas and improved the carbon deposition resistance compared to a monometallic anode catalyst. This journal is © The Royal Society of Chemistry.

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