摘要
The exergy losses and thermodynamic efficiency of MSF plant with brine recirculation are discussed bymeans of temperature difference functions proposed by the auther.In a MSF plant,the irreversible losses are found mainly in irreversible heat-transfer and flash evaporationprocesses.However,the basic variables are the temperature drop from stage to stage and the temperaturedifferences between flashed vapor and cooling water.In this paper,the flash temperature difference func-tion,the heat transfer temperature difference function and the total temperature difference function are sug-gested.The proposed temperature difference functions of MSF plant provide a convenient tool to analyse theirreversible behavior and evaluate the exergetic efficiency of this system,because without such improvement thecalculation of the exergetic efficiency of a MSF plant according to the classical formula will be not onlyinconvenient but also insignificant.As a result of present analysis,the reasonable parameters based on theenergy consumption are easily chosen.The above-mentioned principles are confirmed by commercial plants and a pilot plant in Tianjin.
The exergy losses and thermodynamic efficiency of MSF plant with brine recirculation are discussed by means of temperature difference functions proposed by the auther. In a MSF plant,the irreversible losses are found mainly in irreversible heat-transfer and flash evaporation processes.However,the basic variables are the temperature drop from stage to stage and the temperature differences between flashed vapor and cooling water.In this paper,the flash temperature difference func- tion,the heat transfer temperature difference function and the total temperature difference function are sug- gested.The proposed temperature difference functions of MSF plant provide a convenient tool to analyse the irreversible behavior and evaluate the exergetic efficiency of this system,because without such improvement the calculation of the exergetic efficiency of a MSF plant according to the classical formula will be not only inconvenient but also insignificant.As a result of present analysis,the reasonable parameters based on the energy consumption are easily chosen. The above-mentioned principles are confirmed by commercial plants and a pilot plant in Tianjin.
