固体散料余热驱动双压ORC多目标优化设计

The solid bulk material from industrial production has large displacement and high temperature, so the waste heat recovery for solid bulk material can significantly reduce energy consumption and environmental thermal pollution. Dual-pressure Organic Rankine cycle system is established to cascading recycle the bottom waste heat from the solid bulk material, whose performance is compared with single-pressure ORC system using R1234ze(E) and R1234yf as working fluid respectively, and multi-objective optimization is further carried out. According to the results, the high-pressure evaporation pressure is the key variable that matters the performance of the dual-pressure ORC system. Taking the cost and performance into consideration compressively, the single-pressure system using R1234yf as working fluid has the lowest unit net power cost. The dual-pressure system using R1234ze(E) as working fluid has the optimal performance, and the optimal net power is 84.939 kW, while the optimal system exergy efficiency and available exergy efficiency from heat source are 38.811% and 93.541%.