关键词: 化学链燃烧, 双级旋风分离器, 颗粒流, 数值模拟, 优化

Abstract: Due to the ash has an inhibitory effect on activity of oxygen carrier in coal-fueled CLC(chemical looping combustion) technology,a new method of separating oxygen carrier and ash respectively by double-stage cyclone separator was proposed in this paper. The RSM(SSG) turbulence model and the particle stochastic trajectory model were both adopted,and the phase coupling was also considered. The numerical simulation was carried out for optimizing the double-stage cyclone separator in CLC facility. According to the simulation result,the size and structure of separator inlet was mainly analyzed and optimized,and the separation performance was verified by experiments. The simulation and experimental results of final optimization model both showed that more than 90% of CaSO₄ oxygen carriers return to furnace from dust removal port of first stage separator. The CaSO₄ loss rate was reduced. About 50% of ash particles were separated from dust removal port of second stage separator,only about 13% with the air discharge from the exhaust port. Dust-returning rate was effectively reduced and the clean exhaust gas was relatively released. The results are significant to the efficient operation of coal-fueled CLC facility.

Key words: chemical looping combustion (CLC), double-stage cyclone separator, granular flow, numerical simulation, optimization