Surrogate model for improved simulations of small-scale sludge incineration plants

Anton Žnidarčič (Avtor), Tine Seljak (Avtor), Tomaž Katrašnik (Avtor)

Povzetek

Although various modelling approaches exist for the simulation of solid fuel combustion, no specific model hasbeen developed for the accurate description of gas-phase combustion in small-scale combustion devices. This isparticularly limiting in scenarios when volatile-rich, complex and incompletely described solid fuels such assewage sludge are used. To address this issue, an accurate description of combustion from the fuel bed onwardsis required as well as an improved description of emitted volatiles. This paper introduces an innovative surro-gate-based combustion model that combines data on sludge devolatilisation and measured combustion char-acteristics to offer a new surrogate composition. The composition includes heavy hydrocarbon species to ac-curately describe combustion evolution. A sensitivity analysis revealed that H2contributes significantly tocombustion evolution, while the most robust surrogate composition is obtained when ethanol is used as a leadingrepresentative of heavier hydrocarbons. The model can be used to produce suitable surrogates for the mainsludge combustion interval, offering the required improvement in fuel descriptions and accuracy of simulationsin the vicinity of the fuel bed. Hence, this model is particularly suitable for the optimisation of temperature, heatrelease rate, and concentration field in combustion chambers with limited volumes.

Ključne besede

sewage sludge;combustion;detailed reaction kinetics;volatiles;3D CFD numerical simulations;

Podatki

Jezik:	Angleški jezik
Leto izida:	2020
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	519.876.5:662.581(045)
COBISS:	25534979
ISSN:	0016-2361
Št. ogledov:	464
Št. prenosov:	427
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	odpadni mulj;zgorevanje;detajlna kemijska kinetika;volatili;3D CFD numerične simulacije;
Strani:	str. 1-15
Zvezek:	ǂVol. ǂ280
Čas izdaje:	Nov. 2020
DOI:	10.1016/j.fuel.2020.118422
ID:	12029406