STUDY OF MECHANISM OF COAL ASH SLAGGING ON REFRECTORY INFLUENCED BY ATMOSPHERES IN FURNACE
In this paper, ash of Yungui coal was selected for its low deformation temperature (DT is about 1120℃). Two samples of 0.6g the ash of Yungui coal were put on the corundum based refractories first, then they were laid in a muffle furnace for sintering experiments, which were made at 1250℃ for 5 hours under air atmosphere and weak reduction atmospheres respectively. After the experiments, the samples were cooled down naturally to room temperature, then a scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) was carried out for investigating the microscopic structure of the slagging sintered on the corundum based refrectory board under weak reduction and air atmospheres. Accordingly, the following conclusions can be made from the analysis: (1) at 1250℃, the slagging sintered on the corundum based refractory under weak reduction atmosphere was quite tight, while the slagging sintered under air atmosphere was rather loose and no evident penetration into the refractory was observed; (2) atmospheres in the muffle furnace had a great effect on the slagging of melted coal ash on the refractories through changing the transformation forms of the mineral components (such as Fe) in coal ash; (3) the corundum based refractory implies a good slagging resistance effect by avoiding reasonably the forming of weak reduction atmosphere in furnaces during boilers operation.
weak reduction and air atmospheres corundum based refractory slagging SEM
Yanfei CHEN Donglin CHEN Xiaozhong YAN Chang YE Jinqiao HE Xiaochong PEI
School of Energy and Thermal Power Engineering, Changsha University of Science and Technology, Chang School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
983-988
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）