Yang P.,Shanghai JiaoTong University |
Lu X.-R.,China Kunlun Engineering Company |
Lao G.-R.,China Kunlun Engineering Company |
Weng Y.-W.,Shanghai JiaoTong University
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014
For an organic working medium Rankine cycle power generation system with the waste heat from the aromatic hydrocarbon distillation process serving as the heat source, established was a mathematical model, calculated and compared were such parameters as the working pressure, expansion ratio and system efficiency etc. of several working media including R600a, R601and R245fa and analyzed and verified was the influence of the flow resistance of the working media and several commonly-seen cooling modes on the working parameters and efficiency of the system. It has been found that when the evaporation temperature of the working medium falls in a range from 90 to 130 ℃, under the condition of the condensing temperature being 45 ℃, the flow resistance loss will lead to a decrease in the power generated by the system and its efficiency by about 1.5% to 9.2% and 1. 7 to 9.3 % respectively. The power consumption of the circulating water cooling system will account for a maximal proportion of the power generated by the system (i. e. power consumption ratio), attaining 7.6 % to 13.7 % and the power consumption ratio of the once-through water cooling system will be minimal, being about 3. 6% to 4. 9%. Compared with the direct air cooling mode, the wet type air cooling mode can enhance the power generation efficiency of the system by 40.4% to 47.7% when the ambient temperature is higher than 30 ℃.
Yu J.-L.,Dalian University of Technology |
Dong S.,China Kunlun Engineering Company |
Zhu Y.-Y.,Central South University |
Li N.,Dalian University of Technology |
Qin L.,Dalian University of Technology
Petrochemical Equipment | Year: 2010
Using sleeve to repair pipe crack is one of the most common means. The elastic-plastic finite element method was applied to analyze the structure of the sleeve covered pipe having axial through-wall crack. The limit load factor p, which was used to describe the ultimate bearing capacity was studied. The results indicated that p subjected to the sleeve location, and was increased when the sleeve width and thickness became larger respectively. Recommended parameters of sleeve are given for practical application.