Two kinds of residues,obtained from extraction of one weakly reductive coal,Shenfu-Dongsheng coal(SD),and one reductive coal,Pingshuo coal(PS),with sub-and supercritical water on a semi-continuous apparatus,were chara...Two kinds of residues,obtained from extraction of one weakly reductive coal,Shenfu-Dongsheng coal(SD),and one reductive coal,Pingshuo coal(PS),with sub-and supercritical water on a semi-continuous apparatus,were characterized by calorific value analysis and XPS analysis,and the combustion behaviors of residues were investigated by thermogravimetric analysis.The results show that the residues have higher calorific value than raw coal samples,and SD residue has higher calorific value than PS residue.C-C,C-O and pyridinic nitrogen,pyrrolic nitrogen are the dominant form of C,O and N on the surface of raw coal samples and their extraction residues.The combustion behaviors of extraction residues show that the SD residue is more reactive and more easily burned than PS residue.展开更多
The combustion performance of the blend of lignite and residue from Shenhua coal liquefaction was studied.It is found that the DTG plot for the combustion of residue of coal liquefaction has three characteristic peaks...The combustion performance of the blend of lignite and residue from Shenhua coal liquefaction was studied.It is found that the DTG plot for the combustion of residue of coal liquefaction has three characteristic peaks,while the DTG plot of lignite combustion has one characteristic peak.With the decreasing of the blending ratio of coal liquefaction residue to lignite the three characteristic peaks become faintness.The combustion activation energies of blended coals are calculated.Compared with the blended coals,the coal liquefaction residue has the biggest activation energy,but the lignite has the lowest one.With the blending ratio decreasing the activation energy and ignite temperature of blends decrease slightly.The maximum weight loss rate DTGmax for coal liquefaction residue is bigger than that for lignite.展开更多
基金National Natural Science Foundation of China(No.90410018,20576019,20776028)Key Program in Major Research Plan for the West of China
文摘Two kinds of residues,obtained from extraction of one weakly reductive coal,Shenfu-Dongsheng coal(SD),and one reductive coal,Pingshuo coal(PS),with sub-and supercritical water on a semi-continuous apparatus,were characterized by calorific value analysis and XPS analysis,and the combustion behaviors of residues were investigated by thermogravimetric analysis.The results show that the residues have higher calorific value than raw coal samples,and SD residue has higher calorific value than PS residue.C-C,C-O and pyridinic nitrogen,pyrrolic nitrogen are the dominant form of C,O and N on the surface of raw coal samples and their extraction residues.The combustion behaviors of extraction residues show that the SD residue is more reactive and more easily burned than PS residue.
文摘The combustion performance of the blend of lignite and residue from Shenhua coal liquefaction was studied.It is found that the DTG plot for the combustion of residue of coal liquefaction has three characteristic peaks,while the DTG plot of lignite combustion has one characteristic peak.With the decreasing of the blending ratio of coal liquefaction residue to lignite the three characteristic peaks become faintness.The combustion activation energies of blended coals are calculated.Compared with the blended coals,the coal liquefaction residue has the biggest activation energy,but the lignite has the lowest one.With the blending ratio decreasing the activation energy and ignite temperature of blends decrease slightly.The maximum weight loss rate DTGmax for coal liquefaction residue is bigger than that for lignite.
