Co-firing test research on melting characteristics of fly ash for distillers’ grains and anthracite coal

Abstract

In order to improve the combustion performance of anthracite coal and solve the problem of resource utilization of distillers’ grains, experiments on the mixing combustion of anthracite coal and distillers’ grains were carried out and the effects of different combustion conditions on their ash characteristics were investigated in order to provide theoretical guidance for the optimization of combustion parameters in the actual operation of power plants. The ash samples were made on a drop tube furnace and a tube furnace, and then the microscopic morphology of the slag was observed by Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS), while its mineralogical composition was analysed by X-ray diffraction (XRD). The results show that the increase of distillers’ grain mixing ratio, combustion temperature and oxygen concentration will lead to the deterioration of ash slagging characteristics, while the excess air coefficient has little effect on it.

Keywords

• distillers’ grains
• co-firing
• ash melting characteristics
• micro-morphology
• mineral composition