To investigate the effect of blending ratio on co-combustion characteristics of sludge hydrothermal carbon and municipal solid waste

and reveal the interaction between the two materials

thermogravimetric analyzer is used to test the combustion characteristics of sludge hydrothermal carbon

municipal solid waste and mixed samples. The combustion kinetics of the samples were analyzed by Coats-Redfern method. Based on the difference between the experimental combustion characteristics and the theoretical combustion characteristics of the mixed samples

the interactions between the two materials was revealed. The results showed that

the ignition temperatures and burnout temperatures of the mixed samples decreased with the increase of sludge hydrothermal carbon blending ratio

but the combustion rate also decreased

resulting in a decrease of the comprehensive combustion characteristic index. As the blending ratio of sludge hydrothermal carbon increased from 0% to 80%

the comprehensive combustion characteristic index of mixed sample decreased by 71.8%. With the increase of sludge hydrothermal carbon blending ratio

the activation energy of volatile combustion stage decreased

while the activation energy of char combustion stage increased. There was a significant interaction between sludge hydrothermal carbon and municipal solid waste

which can inhibit the combustion of volatiles. In the blending ratio range of 20%～80%

the comprehensive combustion characteristic index of the mixture decreased by 12.9%on average. The research results can provide data reference and theoretical basis for the control of the working condition and the design of ACC automatic control system in the municipal solid waste incineration plant.