Sewage sludge combustion model with reduced chemical kinetics mechanisms

Žnidarčič, Anton (author), Katrašnik, Tomaž (author), Zsély, I. G. (author), Nagy, T. (author), Seljak, Tine (author)

Commonly applied 3D CFD models lack suitable combustion description of fuels with complex composition, such as encountered in wastewater sludge specific applications. This significantly influences their prediction capability, in particular when used in small, confined combustion volumes. To tackle this challenge, it is necessary to introduce detailed chemical kinetic models for specifically tailored fuel surrogates, which ensure physically accurate description of local thermodynamic conditions and heat release rates. However, necessity to increase the level of detail of models needs to be balanced by their computational expenses to preserve their applicability when solving real engineering problems. With an aim to fill this gap, the present study significantly extends the existing surrogate model methods for applications in small-scale systems to include also reduced combustion kinetic mechanisms. The innovative extension applies Simulation Error Minimization Connectivity Method and involves tailoring of kinetic mechanisms to variable thermodynamic conditions and variable surrogate compositions, specific to sewage sludge combustion. Suitability of the proposed approach is confirmed with the 3-D CFD simulations maintaining similar level of accuracy within the design space of reduced mechanisms as well as in off-design conditions, while maintaining sufficient flexibility to adapt to different types and compositions of the sludge. Thereby, reduction of the in-model applied detailed ethanol and propene mechanisms from 47 and 71 species down to 33 and 34 species, respectively, was demonstrated together with linearly dependent decrease in computational time. The proposed model extension and resulting surrogate combustion model thus for the first time offer an efficient tool for affordable and accurate virtual design of small-scale combustion systems using fuels with complex chemical composition.

• Language: English
• Keywords: combustion, chemical kinetics, sewage sludge, numerical simulations, reduced reaction mechanisms, 3-D CFD, surrogate model, detailed chemical kinetics, reaction mechanisms
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 15 str.
• Numbering: Vol. 236, art. 114073
• PID: 20.500.12556/RUL-126413
• UDC: 004.942:628.3(045)
• ISSN on article: 0196-8904
• DOI: 10.1016/j.enconman.2021.114073
• COBISS.SI-ID: 58189827
• Publication date in RUL: 21.04.2021

Record is a part of a journal

• Title: Energy conversion and management
• Shortened title: Energy convers. manage.
• Publisher: Elsevier
• ISSN: 0196-8904
• COBISS.SI-ID: 2618919

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: zgorevanje, kemijska kinetika, odpadni mulj, numerične simulacije, reducirani reakcijski mehanizmi