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s.lar chemical looping reforming of methane combined with is.thermal H2O/CO2 s.litting us.ng ceria oxygen carrier for s.ngas.production

引用

Journal of Energy Chemis.ry 2020年第2期29卷 60-72页

作者： s.irat Chuayboon s.éphane abanades.s.lvain rodat Proces.es Materials and Solar Energy LaboratoryPROMES-CNRSFont-Romeu 66120France Department of Mechanical Engineering King Mongkut's Institute of Technology LadkrabangPrince of Chumphon CampusChumphon 86160Thailand Univers.te Grenoble Alpes Le-Bourget-du-Lac F-73375France CEA-LJTEN Laboratoire des.s.s.emes.s.laires.Haute Temperature(Ls.T) Grenoble F-38054France

The chemical looping reforming of methane through the nons.oichiometric ceria redox cycle(CeO2/CeO2-δ) has.been experimentally inves.igated in a directly irradiated s.lar reactor to convert both s.lar energy and methane to s.ngas.in the temperature range 900–1050 °C. Experiments.were carried out with different ceria s.apes.via two-s.ep redox cycling compos.d of endothermic partial reduction of ceria with methane and complete exothermic re-oxidation of reduced ceria with H2 O/CO2 at the s.me operating temperature, thereby demons.rating the capability to operate the cycle is.thermally. A parametric s.udy cons.dering different ceria macros.ructure variants.ceria packed powder, ceria packed powder mixed with inert Al2 O3 particles. and ceria reticulated porous.foam) and operating parameters.methane flow-rate, reduction temperature, or s.ntering temperature) was.conducted in order to unravel their impact on the bed-averaged oxygen non-s.oichiometry(δ), s.ngas.yield, methane convers.on, and s.lar reactor performance. The ceria cycling s.ability was.als. experimentally inves.igated to demons.rate repeatable s.ngas.production by alternating the flow between CH4 and H2 O(or CO2). A decreas. in s.ntering temperature of the ceria foam was.beneficial for increas.ng s.ngas.s.lectivity, methane convers.on,and reactor performance. Increas.ng both CH4 concentration and reduction temperature enhanced δ with the maximum value up to 0.41 but concomitantly favored CH4 cracking reaction. The ceria reticulated porous.foam s.owed better performance in terms.of effective heat trans.er, due to volumetric abs.rption of concentrated s.lar radiation and uniform heating with lower s.lar power cons.mption, thereby promoting the s.lar-to-fuel energy convers.on efficiency that reached up to 5.60%. The energy upgrade factor achieved during cycle was.up to 1.19. s.able patterns.in the δ and s.ngas.yield for cons.cutive cycles.with the ceria foam validated material performance s.ability.

关键词： Chemical looping Methane reforming Ceria s.ructure Concentrated s.lar power s.ngas production H2O/CO2 s.litting

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Natural gas.pyrolys.s.in double-walled reactor tubes.us.ng thermal plas.a or concentrated s.lar radiation as.external heating s.urce

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Journal of Natural Gas.Chemis.ry 2009年第1期18卷 1-8页

作者： s.phane abanades s.efania Tes.ari s.lvain rodat Gilles.Flamant Proces.es Materials and Solar Energy Laboratory (PROMES-CNRS) 7 Rue du Four Solaire 66120 Font-Romeu France

The thermal pyrolys.s.of natural gas.as.a clean hydrogen production route is.examined. The concept of a double-walled reactor tube is.propos.d and implemented. Preliminary experiments.us.ng an external plas.a heating s.urce are carried out to validate this.concept. The res.lts.point out the efficient CH4 dis.ociation above 1850 K （CH4 convers.on over 90%） and the key influence of the gas.res.dence time. s.mulations.are performed to predict the convers.on rate of CH4 at the reactor outlet, and are cons.s.ent with experimental tendencies. A s.lar reactor prototype featuring four independent double-walled tubes.is.then developed. The heat in high temperature proces. required for the endothermic reaction of natural gas.pyrolys.s.is.s.pplied by concentrated s.lar energy. The tubes.are heated uniformly by radiation us.ng the blackbody effect of a cavity-receiver abs.rbing the concentrated s.lar irradiation through a quartz window. The gas.compos.tion at the reactor outlet, the chemical convers.on of CH4, and the yield to H2 are determined with res.ect to reaction temperature, inlet gas.flow-rates. and feed gas.compos.tion. The longer the gas.res.dence time, the higher the CH4 convers.on and H2 yield, whereas.the lower the amount of acetylene. A CH4 convers.on of 99% and H2 yield of about 85% are meas.red at 1880 K with 30% CH4 in the feed gas.（6 L/min injected and res.dence time of 18 ms., A temperature increas. from 1870 K to 1970 K does.not improve the H2 yield.

关键词： methane hydrogen thermal cracking plas.a concentrated s.lar energy tubular reactor

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