化工进展2017，Vol.36Issue(9)：3223-3230,8.DOI:10.16085/j.issn.1000-6613.2017-0056
有机朗肯循环中的工质热源转折温度及其特征
Shift-temperature of heating fluid and its characteristics for working fluid in organic Rankine cycle
摘要
Abstract
The existence of the maximum power cycle and no maximum power cycle in organic Rankine cycle(ORC)means that there is a kind of shift-curve of net power output and its corresponding shift-temperature of heating fluid for the working fluids; which played an index function in the selection of the working fluids and the evaluation of the cycle performance. Based on trapezoidal cycle and its theoretical model,the relation and formulas of the saturated line shape(saturated liquid line slope,saturated gas line slope and its ratio and critical temperature)and thermal properties of the working fluids as variables were established. The model of working fluid with linear saturated line was proposed and defined. The mathematical model and relation between the cycle performance and properties of the working fluids were built. The empirical equations of the shift-temperature of heating fluid for the working fluid in ORC and the theoretical equations of the shift-temperature of heating fluid in working fluid with linear saturated line were derived,respectively. The characteristics and general principles of the shift-temperature of heating fluid and its corresponding optimum condition were investigated. Results showed that the deviation of shift-temperature of heating fluid with 21 working fluids between empirical equations and numerical simulations in ORC was less than 1.97％. The shift-temperature of heating fluid in model of working fluid with linear saturated line is the addition of the critical temperature of working fluid and the pinch point temperature difference of evaporator. The maximum optimal conditions(maximum optimal evaporation temperature and maximum net power output)corresponding to the shift-temperature of heating fluid increases with the ratio of the saturated line slope, which will be close to the critical point of the working fluid when it becomes the dry working fluid.关键词
有机朗肯循环/梯形循环/线性饱和线工质/工质热源转折温度/最高优化工况Key words
organic Rankine cycle/trapezoidal cycle/working fluid with linear saturated line/shift-temperature of heating fluid for working fluid/maximum optimum condition分类
能源科技引用本文复制引用
李新国,王伟,翟哲,南来福,王竞逸..有机朗肯循环中的工质热源转折温度及其特征[J].化工进展,2017,36(9):3223-3230,8.基金项目
国家自然科学基金项目(51276122). （51276122）
