Combustion of char received after sewage sludge pyrolysis in the circulating fluidized bed

This paper presents results of investigations concerning NOx, SO2 emissions during the incineration of char received after raw sewage sludge pyrolysis in circulating fluidized bed combustors and the concentration of heavy met als in char and ash. After sewage sludge pyrolysis three different products were obtained. These included: oil, gas and char (carbonaceous residues). Char was the one whic h amount was the greatest. However the analysis of the char showed that it had low volatile matter content and high ash content. The heating value of the char is similar to those of the brown coals. According to such features of char the technique of circulating fluidized b ed was chosen. Experience obtained from coal combustion in circulating flui dized bed showed that these systems have several advantages e. g. uniform t emperature distribution throughout the chamber, low emissions of CO and NOx . The results of investigations show that char incineration in such conditi ons offers similar advantages.