Heat integration for low-rank coal based pyrolysis polygeneration system
The temperature distributions and the energy consumption characteristics show that the low-rank coal based pyrolysis polygeneration system has a great potential of the energy saving.The pinch analysis was applied to optimize the internal subsystems,especially the drying unit and the pyrolysis unit.The thermal data were extracted from the original flow sheet.The hot and cold composite curves and the heat exchanger network structure for the original and optimal system are compared.Through the calculation,the minimum utilities for heating the cold streams and cooling the hot streams of the original system are 184.6 kW and 170.4 kW respectively,and those for the optimal system are 27.5 kW and 8.9 kW respectively when the pinch temperature of the co-production system is 90oC.The energy consumption and the exergy loss of the system decrease by 46.1%and 30.8%respectively.There are 15 heat exchangers in the heat integration scheme.The heat integrations of the drying unit and the pyrolysis unit make great contributions in the decline ratios.The energy saving potential is further explored from the exergy and process characteristic analysis of each unit.
Low-rank coal based Polygeneration Heat integration Pinch analysis
Xiaohui Chen Jing Guo Danxing Zheng Juan Chen Yue Mi
Beijing University of Chemical Technology,Beijing,China
国际会议
桂林
英文
1-9
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）