Applied Research Of Organic Rankine Cycle In Low-grade Industrial Waste Heat Recovery

Energy shortage and environmental pollution become increasingly severe intheworldwide,so improving energy efficiency is very necessary.Low-grade waste heatresources accounted for35%-60%of the total energy consumption in the industrialfield.These Low-grade waste heat resources release directly into the atmosphere withoutany recycling. The problem of China’s energy shortage and environmental pollution willdecrease if we can recycle this part of the energy.Each key part of Organic Rankine cyclepower generation system was analyzed in this thesis.Energy situation and status of waste heat utilization of China were introducedfirstly.Then a simplified model of Organic Rankine cycle was proposed,also power andefficiency of this system were analyzed theoretically.Generating capacity and efficiency ofR134a、R141b、R245fa and mixed organic working fluid were studied based on steam wasteheat resources in one factory.The working fluid parameters were calculated by REFPROPfirstly, power and efficiency of the system were also calculated by MATLAB secondly.Then the expansion ratio of screw expander,the flux of R134,thestructural parameters ofevaporator were set based on these data.Also some simulation research by UDF have beenimplanted into Fluent to analysis evaporation and condensation of evaporator,the data ofsimulation matchesthe design parameters well.At last, system efficiency is respectively8.14%and41.24%based on first and second law of thermodynamics.