The optimization of low-rank coal grinding for transport coal gasification by robust design

► KBR transport gasifier is an effective process for gasification of low-rank coal. ► However, a feed coal for this gasifier has a narrow particle size distribution. ► Grinding parameters on hammer mill was investigated by Taguchi method. ► Aperture size of screen in the second hammer mill was the most significant factor. ► The ratio of product loss was 10.18% under the optimized condition.