Analysis And Simulation Optimization Of Sludge Pyrolysis Process

Sludge pyrolysis technology has the advantages of no pollution,low energy consumption and high added value of products.Pyrolysis gas can be recycled and utilized.Pyrolysis oil can be processed into chemical fuels.Can solve the problem of sludge disposal and realize high value and harmless utilization.The results of this paper provide theoretical basis and data support for the industrialization of sludge pyrolysis.The main contents are as follows:The mechanism of sludge pyrolysis was discussed by TG-FTIR at different heating rates.The distribution and precipitation rule of the gaseous products were analyzed.The main gaseous products are CO₂,CO,H₂O,CH₄,hydrocarbons,alcohols,aldehydes,ketones and carboxylic acids.At 600?,Volatiles of sludge overflow close to complete.The distributed activation energy model?DAEM?concludes that the activation energy is distributed between 23¹19kJ/mol.Reference to the pyrolysis conditions of the actual process?particle size<10mm?,two steps of chemical dynamics model are established,and the Matlab simulation software is used to solve the model.Under nonisothermal condition,stay for 30 minutes,the pyrolysis effect is the best when the heating rate is 20?/min.Under isothermal conditions,stay for 20 to 30 minutes,the best pyrolysis effect can be achieved at 500?.Aspen Plus was used to simulate the pyrolysis process.The effects of temperature and pressure on the calorific value,gas yield and pyrolysis efficiency were investigated.At 600?,the lowest calorific value reached 16.803MJ/m³.At 700?,gas yield reached0.847Nm³/kg,pyrolysis efficiency reached 95.30%.From the two aspects of product utilization and energy saving,it is advisable to use 600?in practical application.