The efficient drying pre-treatment and gasification resource utilization of sewage sludge is one of the important ways to realize green and sustainable city development.Firstly

the thermogravimetric reactor was used to study the drying kinetics of sludge.Then

the influence of high temperature-low speed flue gas and low temperature-high speed flue gas on the sludge drying process was clarified based on Fluent numerical simulation.Finally

a new type of sludge and biomass co-gasification co-generation system was established by Aspen Plus

and the thermodynamic performance of the system was discussed.The results show that

the drying process of sludge in thermogravimetric reactor can be divided into the ascending stage

the first decreasing stage and the second decreasing stage

and the decreasing stage is the main stage.The water diffusion coefficients of SW-60 and SW-80 ranged from 6.34×10~(–6) to 3.72×10~(–5) m~2/s and 3.69×10~(–5) to 2.60×10~(–4) m~2/s

respectively.The drying activation energy of SW-60 and SW-80 was 9.55 k J/mol and 28.25 k J/mol

respectively

with the increase of initial moisture content.In the drying bed

the drying efficiency of high temperature-low speed flue gas is about 2.67times that of low temperature-high speed flue gas.In the co-generation system

as the biomass blending ratio increases

the input heat

air flow

low heating value of syngas

yield of syngas and potential of co-generation all increase.However

the electrical efficiency

thermal efficiency and system efficiency will decrease slowly.When the biomass blending ratio is 20%

the blend of 30%moisture dry sludge and biomass can produce electrical energy potential and thermal energy potential of 0.61 k W·h and 4.212 MJ per kg

respectively.