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Oxidative pyrolysis of biomass pellets in a fixed bed

Abstract : Staged gasification is an innovative technology for small and medium renewable energy production. The expansion of the range of usable biomass remains a major obstacle to development. This thesis focuses specifically on the oxidative pyrolysis in a fixed bed, the first step of the process that strongly influences the performance and reliability of this technology. Three types of biomass- pine, miscanthus and wheat straw - in form of pellets were studied. An experimental study was carried out in a pilot fixed bed reactor of 20 cm diameter and 1.6 m height allowing the reproduction of similar conditions to those existing in the pyrolysis step of an industrial gasifier. The process operation for the three biomasses was characterized by measuring the air/biomass ratio, bed temperature, yields and compositions of char, permanent gases and condensates. A particular attention was paid on the oxidation zone which propagates upward towards the raw biomass. A method was developed to measure the propagation velocity, thickness and the compaction of the oxidation zone and to study the impact of the biomass nature. Velocity and thickness of this zone were 25 % lower in a fixed bed of wood pellets than in beds of wheat straw or miscanthus. Catalytic effect of the mineral matters on primary and secondary pyrolysis reactions and their impact on the process operation have been highlighted.
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Submitted on : Tuesday, December 18, 2018 - 10:12:06 AM
Last modification on : Tuesday, April 21, 2020 - 2:06:12 PM
Long-term archiving on: : Tuesday, March 19, 2019 - 4:51:30 PM


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  • HAL Id : tel-01958553, version 1



Xuan Huynh Pham. Oxidative pyrolysis of biomass pellets in a fixed bed. Other. Université de Perpignan, 2018. English. ⟨NNT : 2018PERP0029⟩. ⟨tel-01958553⟩



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