Simplified model to evaluate heat losses to the environment in the gasification zone of a downdraft reactor
Abstract
Gasification is one of the thermo conversion processes with the greatest application prospects for the transformation of biomass into a fuel with greater added value and field of application. Within the technologies currently in use, downdraft gasifiers are the most widely used for small capacity installations. During the thermodynamic evaluation of these gasifiers, one of the energy losses to take into account is the heat losses to the environment and given the variety of heat transfer processes that occur within the reactor, the calculation method are complex. In the present work, a simplified model is developed to evaluate these heat losses to the environment. The model allows from the project stage to evaluate the losses based on the dimensions of the reactor, the thermal properties of the construction materials and the working temperature of the bed with an error of less than 1% with respect to the non-simplified method.
References
2. PRANDO D, SHIVANANDA S Ail, CHIARAMONTI D, BARATIERI M, and DASAPPA S. Characterization of the producer gas from an open top gasifier: Assessment of different tar analysis approaches. Fuel, 2016, 181, pp: 566–572. ISSN: 0016-2361
3. RUÍZ, J. A, JUÁREZ M. C, MORALES M. P, MUNOZ P, MENDIVIL M. A. Biomass gasification for electricity generation: Review of current technology barriers. Renewable and Sustainable Energy Reviews, 2013, 18, pp: 174-183. ISSN: 1364-0321
4. MARTÍNEZ González Aldemar, LESME Jaén René, SILVA Lora E.E. Thermodynamic assessment of the integrated gasification-power plant operating in the sawmill industry: An energy and exergy analysis. Renewable Energy, 2020, 147, pp: 1151-1163. ISSN: 0960-1481
5. APARECIDA Cristina, DIEGO A, LORA Electo, LESME René, M Aldemar, D Juan Experimental study on biomass (eucalyptus spp.) gasification in a two stage downdraft reactor by using mixtures of air, saturated steam and oxygen as gasifying agents. Energy Conversion and Management. 2017,145, pp: 314–323. ISSN: 0196-8904
6. MARTÍNEZ J Daniel, VIERA Andrade r, SILVA Lora E, LESME Jaén R. Experimental study on biomass gasification in a double air stage downdraft reactor. Biomass and Bioenergy, 2011, 35(8), pp: 3465-3480 ISSN: 0961-9534
7. OWNER’S MANUAL. ANKUR SCIENTIFIC ENERGY TECHNOLOGIES PVT. LTD. ISO 9001 / ISO 14001 / BS OHSAS 18001 CERTIFIED COMPANY, (2009). Disponible: https://www.tradeindia.com/Seller-11664052-Ankur-Scientific-Energy-Technologies-Pvt-Ltd-/ (Consultada, 26/10/2020)
8. LESME R, GARCÍA L, OLIVA L, PAJARÍN J, REVILLA D. Biomass Gasification for Power Generation Internal Combustion Engines. Process Efficiency. Revista Tecnología Química, 2016, 36(2), pp: 133-144, ISSN 0041-8420
9. LISBETH Galindo A, SILVA Lora E, VIERA Andrade R, GIRALDO S Y, LESME Jaén R, MELIAN Cobas V. Biomass gasification in a downdraft gasifier with a two-stage air supply: Effect of operating conditions on gas quality. Biomass and Bioenergy, 2014, 61, pp: 236-244, ISSN: 0961-9534
10. DIXON, A, CRESSWELL, D. Theorical Prediction of Effective Heat Transfer Parameters in Packed Beds. AIChE Journal, 1979, 25(4), pp. 663–676. ISSN:1547-5905
11. ISMAIL, K.A, STUGINSKY R., 1999. “A parametric study on possible fixed bed models for pcm and sensible heat storage”. Applied Thermal Engineering, 1999, 19, pp: 757-788, ISSN: 1359-4311
12. GALLOWAY T.R, SAGE B.H. A model of the mechanism of transport in packed distended and fluidized beds. Chemical Engineering Science. 1970, 25, pp: 495-505, ISSN: 0009-2509
13. INCROPERA Fran P, DE WITT David P. Fundamentos de transferencia de calor. 4ta. Edición, México. 1999. ISBN 970-17-0170-4
14. ISMAIL, K.A, STUGINSKY R. “A parametric study on possible fixed bed models for pcm and sensible heat storage”. Applied Thermal Engineering, 1999, 19, pp: 757-788 ISSN: 1359-4311
15. VEDAT S. A., SHU H.K, AHMET S. Introduction to heat transfer. Prentice Hall. Unite State of America, 1999. ISBN: 0-13-391061-X
16. MILLS A.F. Transferencia de calor. McGraw-Hill/Irwin.España.1999. ISBN 8480861940
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