关键词: 精馏, 内部热耦合精馏, 节能, 传热, 模拟

Abstract: Operational performance and energy-efficiency were studied on a concentric structured internally heat-integrated distillation column. At total reflux, pressure ratio affected reflux rate, condenser duty and reboiler duty. Reflux rate, condenser duty and reboiler duty decreased with the increase of pressure ratio. Furthermore, theoretical plates and heat transfer rate of the internally heat-integrated distillation column were determined based on experimental data, 9 theoretical plates in the rectifying section and 4 theoretical plates in the stripping section. The heat transfer rate between rectifying and stripping sections was 9.98 kW when pressure ratio was 2.2:1. During continuous operation, energy efficiency of internally heat-integrated distillation column was measured experimentally. Compared with conventional distillation column, the saving of cooling capacity consumption of internally heat-integrated distillation column could be up to 52.3%, and the total heat duty of reboiler and compressor could be decreased by 20.34%. In addition, dynamic simulation was conducted based on experimental data, and the internally heat-integrated distillation column could reach steady state in 2 hours.

Key words: distillation, internally heat-integrated distillation column, energy saving, heat transfer, simulation