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Ji J.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | Ji J.,Nanjing University of Technology | Chen X.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | Chen X.,Nanjing University of Technology | And 2 more authors.
Procedia Engineering | Year: 2014

For the complex calculation and analysis problems existing in the liquid ammonia tank leakage and gas diffusion simulation, by selecting appropriate gas diffusion model and writing a program to simulate and analyze the spread of dangerous gas, This article could draw the ammonia diffusion concentration distribution, and the hazardous areas of ammonia diffusion could be divided accurately and rapidly, then used the program to simulate and analyze the effects of the factors such as wind velocity, ground roughness and liquid ammonia leakage rate on ammonia diffusion. The results proved that when wind direction was in line with the direction of leakage source, ammonia diffusion distance and the hazardous areas showed a trend of decrease with the increase of wind velocity; Ammonia diffusion distance decreased with the increase of ground roughness in the direction of down-wind; Ammonia diffusion distance and hazardous areas increased with the increase of liquid ammonia leakage rate. © 2014 The Authors. Published by Elsevier Ltd.


Ni L.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | Jiang J.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | Wang Z.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | Yao J.,Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control | And 2 more authors.
Process Safety Progress | Year: 2015

This article proposes a new method of instability classification of organic peroxides (ICOP) for assessing the risk of decomposition reaction of organic peroxides, based on the adiabatic calorimetric approaches and fuzzy analytic hierarchy process (FAHP). Tonset is set as instability possibility index. Maximal power density, adiabatic temperature rise, maximum pressure rate, and maximum pressure are set as instability severity index (ISI) with proper weightings by FAHP. Instability possibility index and ISI are converted into ICOP based on risk matrix. The organic peroxides instability can, therefore, be quantified and divided into four levels, acceptable, moderate risk, highly dangerous, and seriously dangerous. Thermal decomposition of di-tert-butyl peroxide 25 mass % and tert-butyl hydroperoxide 68.4 mass % are tested with Vent Sizing Package 2 and Phi-Tech 1 which has the function of Accelerating Rate Calorimeter, respectively. Thermal decompositions of other organic peroxides are presented from citation. The instability rating results of these organic peroxides are presented to illustrate the validity of the method. © 2015 American Institute of Chemical Engineers.

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