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Communication Dans Un Congrès Année : 2012

Estimation of the energetic efficiency of a wood gasification CHP plant using Aspen Plus

Résumé

The simultaneous combined heat and power (CHP) production via biomass gasification is considered as one of the main alternatives to fossil energy. The possibility of significantly decrease greenhouse gas emissions as well as higher electrical performance compared to conventional wood combustion system have led to a growing interest in the gasification process. In the past decades several gasification units at lab- and pilot-scale have been developed but despite promising results (Hofbauer, 2003) none of them reached commercial scale due to unresolved technical issues.Mathematical modeling and simulation studies are then necessary to predict and evaluate the overall performance of new processes, especially at large scale. Numerous simulations have been reported regarding gasification technology (Spath, 2005; Gomez-Barea, 2010; Kaushal, 2010; Radmanesh, 2005) however in most studies gasification reactions are essentially modeled by chemical equilibriums that do not take into account the formation of tars, and the presence of inorganics in the biomass is generally not considered. Besides syngas cleaning and power generation steps are only rarely integrated (Damartzis, 2012).The aim of our work is to provide a rigorous model of an integrated CHP plant consisting of a wood gasification unit including a drying step, a syngas cleaning and cooling unit and a syngas combustion engine. The simulation is implemented in Aspen Plus where the combination of various modules coupled with Fortran user-subroutines gives a comprehensive representation of the system.The gasification unit is an indirect heated gasifier based on the TNEE technology (Deglise, 1985). The raw syngas exiting the gasifier consists of H2, CO, CO2, H2O, CH4, C2H4, C2H6, C6H6, C7H8, C8H8, C9H8, C10H8, C12H8, C14H10, C16H10, NH3, H2S, HCl and solid particles. All of these compounds are modeled for the first time under a biomass gasification process simulation. In order to burn the syngas in a gas engine, strict gas quality requirements have to be achieved (Jenbacher Documentation). As suggested in the literatures (Zwart, 2009; Göransson, 2011), the syngas cleaning unit consists of the following successive steps: cyclone, catalytic tar cracking, syngas cooling up to 120°C, bag filter, water scrubber for tars, NH3 and HCl removal, amine unit for H2S removal and a compressor. The syngas enters the engine at 40 °C and 1 bar with a LHV of 14.5 MJ/kg. The engine produces 10 MWe and 3.3.105 kg/hr of hot water (90/105°C) for district heating.The heat integration of the overall system will be detailed in the communication. A part of the heat contained in the flue gas is used to preheat the air combustion, while the remaining heat added to the recovered heat from the syngas cooling is used to dry the biomass. The energetic assessment of the CHP plant will be discussed and a complete mass balance of the whole process will be depicted. Later in the study, the accurate quantification of the input and output of the CHP plant will be used to evaluate the environmental impact of the technology.
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Dates et versions

hal-01089406 , version 1 (01-12-2014)

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  • HAL Id : hal-01089406 , version 1

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Jessica François, Lokmane Abdelouahed, Guillain Mauviel, Michel Feidt, Caroline Rogaume, et al.. Estimation of the energetic efficiency of a wood gasification CHP plant using Aspen Plus. 15th Conference on Process Integration, Modelling and Optimization for Energy Saving and Pollution Reduction (PRES 2012), Aug 2012, Prague, Czech Republic. ⟨hal-01089406⟩
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