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Zhao X.,Chongqing University | Yang Y.,Chongqing University | Liu A.,Chongqing University | Hu J.,Purdue University | Jia J.,Chongqing Chemical and Pharmaceutical Holding Group Company
Journal of Convergence Information Technology | Year: 2012

The complex management structure and interfaces of a large-scale heavy chemical project raises great challenge to the project owners, especially the inexperienced developing ones. This article aims to examine how the owners' behaviors affect the project outcome of a large-scale heavy chemical project in China and identify key influencing factors for strategy planning reference purpose. Instead of the traditional result-based post-control featured project management tools, the causality-based pre-control tool soft system dynamics (also known as system thinking) is introduced. By conducting the causal diagrams and the extracted causal loops, the project management system is compositely analyzed at both operational and strategic level. The result shows that some of the owners' behaviors have great impacts on the project's outcome based on which four execution strategies are proposed.

Liu S.,Chongqing University | Liu N.,Shihezi University | Yang Y.,Chongqing University | Jia J.,Chongqing Chemical and Pharmaceutical Holding Group Company
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

In order to evaluate hazard's level efficiently and decrease disasters' influence on the surrounding environment, a safety evaluation index system of hazards is set up first by considering influence factors of personnel, equipment, raw material, technology, and environment. Then, a hazards safety evaluation model is built by combining neural network with safety system engineering theory. Finally, case studies testify the model can evaluate the hazards' level reasonably and objectively.

Liu Z.-H.,Chongqing University | Ran Q.-C.,Chongqing University | Ning W.-Z.,Chongqing University | Sun D.-G.,Chongqing University | And 3 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2012

Addition reaction, substitution reaction and continuous reaction occur simultaneously in the chlorination of 1, 3-dichloro-2-butene (DCB). The undermixing of DCB and chlorine, and inefficient dissipation of reaction heat can lead to a low selectivity of substitution production. The features of flow field in stirred tank are closely related to the mixing performance, the conversion and selectivity of chemical reaction, and so on. The control of flow field structure is vital to intensify the process of DCB chlorination. A special CFD software MixSim 2.0.2 for agitator was employed to study the mixing power and flow field of chlorine and DCB with chlorine eccentric jet in a tank stirred by 4 cm two-straight bladed paddle, 5 cm and 4 cm pitched paddle disc agitator, respectively. The experimental results show that flow field structure and coherent structure can be controlled by the eccentric jet, the mixing performance can be enhanced, and the chlorination performance stirred by 5 cm pithed paddle disc agitator was better than that of others' with the eccentric jet, and its yield of goal product 2, 3, 4-trichloro-1-butene (TCB) is increased to 87.9%.

Zhang F.,Chongqing University | Yang Y.,Chongqing University | Jia J.-G.,Chongqing University | Jia J.-G.,Chongqing Chemical and Pharmaceutical Holding Group Company | Wang J.-T.,Chongqing Chemical and Pharmaceutical Holding Group Company
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2012

Aiming at the problem of complex responses of failure modes and vulnerability in collaborative production networked organizations, the research method for system vulnerability was proposed from global and local respectively based on production networked organization's undirected weighted graph, and a ternary model of failure modes was constructed. Based on scale-free networks, the typical production networked organization was simulated, and the influence of vertices/edges failure as well as random/intention failure on system vulnerability were compared by a case study. Moreover, the variation rules of global vulnerability and local vulnerability were calculated.

Zhang F.,Chongqing University | Yang Y.,Chongqing University | Bao B.-F.,Chongqing University | Jia J.-G.,Chongqing University | And 2 more authors.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2012

To address the security problems and weaknesses, and to enhance the stability of collaborative production networked organizations, a process model for system vulnerability analysis based on complex networks theory was proposed. Combination of the characteristics and influence factors, a technical program for vulnerability analysis of collaborative production networked organizations was established. The feasibility of the process model and technical program was verified by the case of a typical heavy chemical company. Moreover, the relationship between system vulnerability and network topology was discussed in three failure modes.

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