Mini CHP based on the electrochemical generator and impeded fluidized bed reactor for methane steam reforming
| Autor: | S. E. Shcheklein, V.G. Tuponogov, M.I. Ershov, A.M. Dubinin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Methane reformer
Waste management Renewable Energy Sustainability and the Environment Chemistry Superheated steam 05 social sciences Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Methane Steam reforming chemistry.chemical_compound Fuel Technology Chemical engineering Heat generation 0502 economics and business Small stationary reformer Solid oxide fuel cell 050207 economics 0210 nano-technology Syngas |
| Zdroj: | International Journal of Hydrogen Energy. 43:13543-13549 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2018.05.151 |
| Popis: | The paper presents a configuration of mini CHP with the methane reformer and planar solid oxide fuel cell (SOFC) stacks. This mini CHP may produce electricity and superheated steam as well as preheat air and methane for the reformer along with cathode air used in the SOFC stack as an oxidant. Moreover, the mathematical model for this power plant has been created. The thermochemical reactor with impeded fluidized bed for autothermal steam reforming of methane (reformer) considered as the basis for the synthesis gas (syngas) production to fuel SOFC stacks has been studied experimentally as well. A fraction of conversion products has been oxidized by the air fed to the upper region of the impeded fluidized bed in order to carry out the endothermic methane steam reforming in a 1:3 ratio as well as to preheat products of these reactions. Studies have shown that syngas containing 55% of hydrogen could be produced by this reactor. Basic dimensions of the reactor as well as flow rates of air, water and methane for the conversion of methane have been adjusted through mathematical modelling. The paper provides heat balances for the reformer, SOFC stack and waste heat boiler (WHB) intended for generating superheated water steam along with preheating air and methane for the reformer as well as the preheated cathode air. The balances have formed the basis for calculating the following values: the useful product fraction in the reformer; fraction of hydrogen oxidized at SOFC anode; gross electric efficiency; anode temperature; exothermic effect of syngas hydrogen oxidation by air oxygen; excess entropy along with the Gibbs free energy change at standard conditions; electromotive force (EMF) of the fuel cell; specific flow rate of the equivalent fuel for producing electric and heat energy. Calculations have shown that the temperature of hydrogen oxidation products at SOFC anode is 850 °C; gross electric efficiency is 61.0%; EMF of one fuel cell is 0.985 V; fraction of hydrogen oxidized at SOFC anode is 64.6%; specific flow rate of the equivalent fuel for producing electric energy is 0.16 kg of eq.f./(kW·h) while that for heat generation amounts to 44.7 kg of eq.f./(GJ). All specific parameters are in agreement with the results of other studies. |
| Databáze: | OpenAIRE |
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