Migration law of N and S pollutants during mixed combustion of sludge/slime
To explore the emission mechanism of N and S pollutants during the mixed combustion of sludge/slime,the migration law of N and S pollutants was studied.Based on the basic generation law of gaseous pol-lutants during mixed combustion of sludge/slime obtained by thermogravimetry-mass spectrometry analyzer,a sludge/slime mixed combustion experimental system was established to study the emission laws of SO2 and NO in the mixed combustion of sludge and slime under different mass fractions of sludge and temperatures.The conversion law of N and S functional groups in the combustion process was studied through X-ray photoelec-tron spectroscopy(XPS)detection of combustion products in four different stages.The results show that the effect of sulfur and nitrogen fixation is the most obvious when the mass fraction of sludge is 40％.With the in-crease of sludge mass fraction,more pyridine nitrogen is converted to pyrrole nitrogen,which increases the yield of HCN and the production of amines and nitriles,resulting in the total NO emission increasing first and then decreasing with the increase of sludge mass fraction.The release of organic sulfur is more complete,the S-containing pollutants produced by combustion increase,and the sulfate content in ash increases simultaneous-ly.Therefore,the total SO2 release changes little with the increase of sludge mass fraction.
sludge/slimemixed combustionmigration of pollutantX-ray photoelectron spectroscopy(XPS)
万方数据
维普
