Study on mixed combustion characteristics of sewage sludge and camellia oleifera shell
The effects of blending ratio and heating rate on co-combustion characteristics of municipal sludge and camellia oleifera shell were studied by thermogravimetric analysis,and the combustion kinetics of the samples were modeled by two methods,Flynn-Wall-Ozawa(FWO)and Kissinger-Akahira-Sunose(KAS).Moreover,the flammability index and comprehensive combustion characteristic index of various samples were calculated,and the interaction between the mixed fuel components during the combustion process was analyzed.The results show that,the burnout temperature of the mixed fuel significantly reduced,and the combustion stability and comprehensive combustion characteristics were significantly improved after the sludge was mixed with camellia oleifera shell.With the increase of the mass blending ratio of camellia oleifera shell from 20%to 80%,the burnout temperature decreased from 590℃to 532℃,the burnout degree gradually increased,the mass loss increased from 63.13%to 92.19%,and the flammability index and comprehensive combustion characteristic index increased by 1.66 and 2.32 times,respectively.The interaction between the components of sludge and camellia oleifera shell mixed combustion occurred,which showed an inhibition effect in the volatile combustion stage,while a promoting effect in the fixed carbon combustion stage.The average apparent activation energies of sludge calculated by the FWO method and KAS method were 122.32 kJ/mol and 118.08 kJ/mol,respectively,and the average apparent activation energies of the camellia oleifera shell were 166.46 kJ/mol and 164.94 kJ/mol,respectively.The average apparent activation energy of the mixed samples increased with the mass mixing ratio of camellia oleifera shell.
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