Abstract
The co-pyrolysis characteristics for hydrochar, paper sludge and their blends were investigated by TG–FTIR technique. The pyrolysis of paper sludge and hydrochar could be divided into three stages and one stage respectively. The model-fitting method was adopted to investigate the kinetic parameters of pyrolysis process, and the n-th order reaction model matched the pyrolysis process well. The activation energy was determined by the composition of the feedstocks and the stages of the pyrolysis. TG- FTIR indicated that CO2, H2O, CO, CH, CO, CO and CC groups were the main gases released from the pyrolysis process. There existed a coupling synergistic effect between these two feedstocks. The evolution of the gaseous products was consistent with the weight loss of the mixtures during co-pyrolysis. The co-pyrolysis effectiveness index was calculated. When the mass proportion of hydrochar was 90%, most desired products could be obtained.
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