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Yu W.,Nanjing University of Technology | Fang J.,Nanjing University of Technology | Fang J.,Jiangsu Key Laboratory of Dangerous Chemical Safety and Control | Pan X.,Nanjing University of Technology | And 5 more authors.
1st CCPS Asia-Pacific Conference on Process Safety 2013, APCPS 2013 | Year: 2013

Conventional process safety design techniques were used to identify potential hazards and suggested corresponding solutions. Nevertheless, the recommend risk reduction alternatives against application of inherent safety design (ISD) concept to prevent or minimize the inherent hazards. One of the main reasons could be the shortage of reasonable techniques or tools to support implementation of the guidewords in process safety design. Thus, a risk-based procedure was conducted to analyze the performance of various inherent safety principles in chemical process. The developed method namely Reformulate Inherently Safer Idea (RISI) could be used to quantitative analysis the hazard and inherent safety degree based on the hazard characteristics of the exothermic reaction and thermal runaway risk assessment theory. Under the condition of the thermal effect of the reaction were more considered, the potential of thermal runaway was represented for the trigger conditions and the power were represented the severity of the accident, then the potential hazards of process was obtained. If the hazard was unaccepted, the inherently safer design must be taken and the inherent safe impact value was calculated. RISI was applied to a nitric acid oxidation of alcohols combined with the experimental data by RC1. The results show that the potential hazard value was reduced by 60% after ISD. Meanwhile, it was found that the sensitivity of RISI to basic process parameters was higher than SWeHI and I2SIindex. © Copyright (2013) By AIChE. All rights reserved. Source

Pi X.,Nanjing University of Technology | Wang R.,Nanjing University of Technology | Wang R.,Jiangsu Key Laboratory of Dangerous Chemical Safety and Control | Guo W.,Nanjing University of Technology | And 7 more authors.
1st CCPS Asia-Pacific Conference on Process Safety 2013, APCPS 2013 | Year: 2013

Experiments were done to research fan water curtain diluting water-insoluble heavy gas (carbon dioxide as an example) dispersion in open space in this paper. In experiments, the influence of water flow pressure, distance between leakage source and water curtain, height of leakage source and squirt angle of fan water curtain on dilution effect were done. Experimental results show that the higher the water pressure of fan water curtain is, the lower the concentration of carbon dioxide behind the water curtain is, and thus, more efficient the dilution effect is. However, when water pressure is no lower than 0.25MPa, the concentration of carbon dioxide behind the water curtain will not continue decreasing. Also, when leakage source height is higher, the concentration of carbon dioxide is higher, and the dilution effect is worse. When water curtain is closer to leakage source, the concentration of carbon dioxide downwind is higher. When the ratio of K, which is leakage source height to the distance of water curtain away from leakage source, is 0.6 and dilution effect is the best. Furthermore, when the squirt angle is 60°, the dilution effect is comparatively good.. © Copyright (2013) By AIChE. All rights reserved. Source

Zhang L.,Nanjing University of Technology | Zhang L.,Jiangsu Key Laboratory of Dangerous Chemical Safety and Control | Yu W.D.,Nanjing University of Technology | Yu W.D.,Jiangsu Key Laboratory of Dangerous Chemical Safety and Control | And 10 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2015

The exothermic oxidation of 3-methylpyridine with hydrogen peroxide was analyzed by Reaction Calorimeter (RC1e) in semi-batch operation. Heat releasing rate and heat conversion were studied at different operating conditions, such as reaction temperature, feeding rate, the amount of catalyst and so on. The thermal hazard assessment of the oxidation was derived from the calorimetric data, such as adiabatic temperature rise (δTad) and the maximum temperature of synthesis reaction (MTSR) in out of control conditions. Along with thermal decomposition of the product, the possibility of secondary decomposition under runaway conditions was analyzed by time to maximum rate (TMRad). Also, risk matrix was used to assess the risk of the reaction. Results indicated that with the increase of the reaction temperature, the reaction heat release rate increased, while reaction time and exotherm decreased. With the increase of feeding time, heat releasing rate decreased, but reaction time and exotherm increased. With the amount of the catalyst increased, heat releasing rate increased, reaction time decreased and exothermic heat increased. The risk matrix showed that when the reaction temperature was 70°C, feeding time was 1h, and the amount of catalyst was 10g and 15g, respectively, the reaction risk was high and must be reduced. © 2015 Elsevier Ltd. Source

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