Pyrolysis and Combustion Characteristics and Kinetics of Municipal Sludge
In order to prevent ecological environment pollution and water resource waste effectively,the study of pyrolysis treatment technology is of great significance in guiding the scientific treatment of municipal sludge.Thermogravimetric analysis was used to investigate the TG(thermogravimetric analysis)and DTG(derivative thermogravimetry)curves of five typical municipal sludges in Chongqing under different heating rates.The distribution characteristics of volatile analysis parameters such as characteristic index D,comprehensive combustion characteristic index,activation energy,and pre-exponential factor under pyrolysis and combustion conditions were analyzed,revealing its pyrolysis and combustion characteristics and kinetic laws.The results show that the volatile and ash contents of the five municipal sludges is higher,while the fixed carbon content is lower.As the heating rate increases,the comprehensive pyrolysis and combustion performance of various sludges improve.Based on the pyrolysis and combustion characteristics parameters at all heating rates,the comprehensive pyrolysis performance of Tuzhu and Yudong sludge is the best,while Tangjiaqiao sludge exhibits the best comprehensive combustion performance.Kinetic analysis are used to toinvestigate regular pattern,the results show that the average activation energy of the pyrolysis process for Yudong sludge is lower than the other four types of sludge,at 112.34 kJ/mol.Similarly,the average activation energy of the combustion process of Tangjiaqiao sludge is lower than the other four types of sludge,at 67.46 kJ/mol.It is concluded that Yudong and Tangjiaqiao sludge exhibit excellent pyrolysis and combustion characteristics,respectively.
municipal sludgethermogravimetric analysispyrolysis characteristicscombustion characteristicpyrolysis kineticscombustion dynamics
万方数据
维普
