Scale-up of CFD-DEM simulation of chemical looping gasification by GPU acceleration

The chemical looping gasification process is an efficient technology for chemical recycling and bioenergy. While the process has been tested in lab and pilot scale, a scale-up to demonstration or industrial scale has not yet been attempted. A potential tool to assist the scale-up is coupled computational fluid dynamics (CFD) and discrete element method (DEM) simulation. However, with conventional simulation techniques the required simulation time is unfeasibly long. In this work the simulation was accelerated by a hybrid approach using both, graphics processing unit (GPU) and central processing unit (CPU) achieving a speed-up of 80 times. An analysis of the main influences on the simulation time was conducted to improve the simulation efficiency. With these results an upscaled simulation of a 200 MW plant was performed achieving plausible results in a reasonable time. Thus, this work provides a proof of concept for CFD-DEM simulation of fluidized bed gasification at industrial scale.