Abstract
Incineration is widely used as an important method of sludge and garbage utilization and harmless treatment. The simulations of co-incineration of sludge and municipal solid waste are conducted by computational fluid dynamics method(CFD) in a MSW incinerator. The study focuses on the effect of mixing proportion, moisture content of sludge, excess air coefficient and primary and secondary air distribution ratio on the combustion progress. Simulation results indicate that the combustion temperature of furnace decreases rapidly with the increase of the mixing proportion and moisture content of sludge, which is mainly because the moisture content of sludge is higher than that of MSW as well as its low calorific value. As a result, it is recommended that the water content and mixing ratio of sludge would be controlled below 40% and 7% respectively. Therefore, the fresh sludge should be dried before entering the furnace.
Highlights
With the rapid development of the urban economy, the treatment capacity required of municipal solid waste(MSW) and sewage sludge is increasing year by year at a tremendous rate around the world
It provides the possibility and commercial application value of sludge mixing in MSW incinerator.Computational fluid dynamics (CFD) is widely used in the design and operation optimization of large-scale combustion equipment, including waste incinerator and coal-fired boiler[8,9]
It was found that the error of numerical simulation results is within 5% of the actual engineering requirements, which means the results of measurement data of actual operation are consistent
Summary
With the rapid development of the urban economy, the treatment capacity required of municipal solid waste(MSW) and sewage sludge is increasing year by year at a tremendous rate around the world. The LHV even approaches the upper limit of incinerator design, which seriously affects the stable and safe operation of MSW incinerators. It provides the possibility and commercial application value of sludge mixing in MSW incinerator.Computational fluid dynamics (CFD) is widely used in the design and operation optimization of large-scale combustion equipment, including waste incinerator and coal-fired boiler[8,9]. The research of scholars shows that the coincineration of sludge and garbage has a perspective future
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