The effects of operating pressure on the gas–solid flow characteristics in a pressurized circulating fluidized bed (CFB) gasification system were studied by experiment and simulation. Elevated operating pressure was found to increase the particle uniformity in the axial and radial directions. Experiments and simulations both showed that as the operating pressure increased, the pressure drops along the riser height decreased. The experimental pressure drops at the same locations decreased when the operating pressure increased, but the opposite trend was observed in the simulation results. A proper drag model must be developed for the accurate simulation of pressurized CFB operation, and the accuracy of electrical capacitance tomography (ECT) measurement and cross-correlation analysis should be improved for better prediction of the particle circulation flux.

通过实验和模拟研究了工作压力对加压循环流化床（CFB）气化系统中气固流特性的影响。发现升高的工作压力增加了轴向和径向方向上的颗粒均匀性。实验和模拟均表明，随着工作压力的增加，沿立管高度的压降降低。当工作压力增加时，相同位置的实验压降减小，但是在模拟结果中观察到相反的趋势。必须开发适当的阻力模型以精确模拟加压CFB操作，