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Mao Y.,Shandong University | Dong L.,Shandong Baichuan Tongchuan Energy Co. | Dong Y.,Shandong University | Liu W.,Shandong University | And 4 more authors.
Bioresource Technology | Year: 2015

The co-pyrolysis characteristic of biomass and lignite were investigated in a Micro Fluidized Bed Reaction Analyzer under isothermal condition. The synergetic effect was evaluated by comparing the experimental gas yields and distributions with the calculated values, and iso-conversional method was used to calculate the kinetic parameters of formation of each gas component. The results showed that synergetic effect was manifested in co-pyrolysis. For the range of conversion investigated, the activation energies for H2, CH4, CO and CO2 were 72.90kJ/mol, 43.90kJ/mol, 18.51kJ/mol and 13.44kJ/mol, respectively; the reactions for CH4 and CO2 conformed to 2 order chemical reaction model, and for H2 and CO conformed to 1.5 order chemical reaction model; the pre-exponential factors for CH4, CO2, H2 and CO were 249.0S-1, 5.290S-1, 237.4S-1 and 2.693S-1, respectively. The discrepancy of the kinetic parameters implied that there were different pathways for forming the different gas. © 2015.

Mao Y.,Shandong University | Dong Y.,Shandong University | Wang B.,Shandong University | Chang J.,Shandong Baichuan Tongchuan Energy Co. | And 4 more authors.
RSC Advances | Year: 2015

This study is devoted to investigate the characteristics and kinetics of biomass tar cracking in a micro fluidized bed reactor for liquids (MFBRL). The carbon balance and conversion were measured to estimate the performance of MFBRL, and the results showed good reproducibility and reliability. H2, CH4 and CO comprised the vast bulk of the producer gas and the total volume fraction of them increased from 69.85% to 93.62% (973-1173 K). Kinetic parameters, including reaction order, pre-exponential factor and apparent activation energy, were studied with the isothermal method. The reaction orders varied greatly with temperature, suggesting that temperature significantly affected the reaction mechanism. The pre-exponential factors for H2, CH4, CO and gas mixtures were in the range of 2.37 × 103 to 2.87 × 105 S-1, while the apparent activation energies ranged from 62.96-100.2 kJ mol-1. Compared to the fixed bed experiments, the derived results were obviously higher, indicating the kinetic parameters were more suitable for describing the intrinsic reactions. © The Royal Society of Chemistry.

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