Abstract
Because of the complexity to describe and solve thermo-chemical processes occurring in a fuel bed in grate-fired boiler, it is often necessary to simplify the process and use modeling techniques based on overall mass, energy and species conservation. A comparison between two numerical models to describe the thermo-chemical conversion process of a solid fuel bed in a grate-fired boiler is presented. In this work both models consider the incoming solid fuel as subjected to drying, pyrolysis, gasification and combustion. In the first approach the biomass bed is treated as a 0D system, but the thermo-chemical processes are divided in two successive sections: drying and conversion (which includes pyrolysis, gasification and combustion). The second model is an empirical 1D approach. The two models need input data such as composition, temperature and feeding rate of biomass and primary air. Temperature, species concentrations and velocity of the producer gas leaving the fuel bed provided by the two models are compared. A sensitivity analysis with respect to mass flow rate of the primary air is also performed, as well as a further comparison regarding the dependence of the producer gas properties on the initial moisture content within the biomass.
Original language | English |
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Title of host publication | Proceedings of the 6th International Conference on Sustainable Energy and Environmental Protection, SEEP 2013 |
Number of pages | 6 |
Publisher | University of Maribor: Faculty of Chemistry and Chemical Engineering |
Publication date | 2013 |
Pages | 559-564 |
Publication status | Published - 2013 |
Event | 6th International Conference on Sustainable Energy and Environmental Protection, SEEP 2013 - Maribor, Slovenia Duration: 20 Aug 2013 → 23 Aug 2013 |
Conference
Conference | 6th International Conference on Sustainable Energy and Environmental Protection, SEEP 2013 |
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Country/Territory | Slovenia |
City | Maribor |
Period | 20/08/2013 → 23/08/2013 |
Keywords
- Solid fuel conversion
- Biomass
- Bed modelling
- Grate firing