THE CHARACTERISTIC AND EVOLUTION OF NITROGEN FUNCTIONAL GROUPS IN COAL AND SEWAGE SLUDGE DURING THEIR CO-COMBUSTION
X-ray photoelectron spectroscopy was used to investigate the characteristic and evolution of nitrogen in mixtures of bituminous coal and sewage sludge (SS) and their chars during isothermal combustion. Five groups of mixtures, in which the mass percent α of SS were 0，10％，20％，30％ and 100％ respectively, were detected at different burn off ratio βof 0, 30％,50％, 70％ and 100％. Important conclusions were obtained from experiment as follows: The nitrogen in the coal existed in the forms of pyridine (N-6), pyrrol (N-5), quaternary nitrogen (N-Q) and nitrogen oxides (N-O). N-5 decreased during mono-combustion while N-6 and N-Q increased at the beginning and decreased with the process. The opposite tendency of N-O was observed. Nitrogen in SS was mainly nitryl（-NO2）, nitrate（NO3 -）and ammonium（NH4 +）. -NO2 declined at first and rose up at last while NO3 - and NH4 ＋ presented in opposite characteristic. Nitrogen in the mixtures resulted from the accumulation of that in coal and SS respectively. N-5 detected was much lower than the estimated value in original mixtures, which may be ascribed to the adhesion of SS on coal surface. The transformation of each functional group during co-combustion were correlated with that during mono-combustion of coal and SS and no obvious interactions was observed, which demonstrated that combustion of nitrogen in mixtures both kept their own characteristics in the process of reaction. The tendency of N-6，N-5，N-Q/NH4 + and N-O/-NO2 were in accordance with coal while that of NO3 - was similar to SS.
sewage sludge coal XPS nitrogen functional group co-combustion
Yi HU Niansu HU Peisheng LI Jie LI Wan YU Zhentao Jing Jun YANG Yanan YUE Guolu YANG
College of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, P.R.China Sewage Sludge a Dept.of Safety Supervision, Tech.& Envi.,China Huaneng Group,Beijing,100082,P.R.China Sewage Sludge and Silt Research Center, Wuhan University, Wuhan 430072, P.R.China School of Water Re
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
247-252
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）