By taking the 130 t/h and 130 ℃ high-press temperature-regulating water in urea device as the research object

the model of organic Rankine cycle(ORC) system is established. R245fa

R600a and R236ea are used as the working fluids

and the system performance is studied under conditions with evaporation temperature of 95～115 ℃

condensation temperature of 26～34 ℃ and superheat degree of 0～20 ℃. The research results show that

under the same simulation conditions

R245fa has the highest cycle thermal efficiency and the largest net output power

R600a has the smallest net output power but the largest specific net work. R236ea has the lowest cycle thermal efficiency and the smallest specific net work. According to the results of the model research and comprehensively considering the aspects of thermodynamic performance

safety and environmental protection

R245fa is selected as the circulating working fluid

and the high pressure temperature regulating water waste heat ORC generator set is designed and constructed. The actual operation results of the unit show that

the circulating thermal efficiency and net output power of the unit are greatly affected by the ambient temperature. When the ambient temperature in winter is 5.4 ℃

the cycle thermal efficiency of the unit reaches 10.78%

and the net output power is 221.40 kW. When the ambient temperature in summer is 30.3 ℃

the cycle thermal efficiency of the unit reaches 9.06% and the net output power is only 190.5 kW.