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The elecTtrhicealelefcftirciceanlcyeffoicfitehnecystoanf dthaerdstsaCnOda2 rcdycslCeO(η2 ScSyGTc)legi(vηeSSnGTi)ngFivigeunrein1Fiisgurerper1esiesnrtepdreinsented EquationE(q1u),awtiohner(e1), w heries th e totiasltChOe t2omtalsCsOflo2 wmarassteflionwthreatceyicnlet.hTehceyscple.cTifhiceesnptehcaiflipciesntohfasltpaitesof sta 1, 2, 2a, 41,,52,,a2nad, 46,,5a,raenhd1,6h,2a, hre2a,hh1,4,hh2,5,ha2an, dh4,hh6,5,reasnpdecht6i,vrelsyp.eTchtievecloye.fTfihciencotsef0f.i5c3ieanntsd0..5437anrde t0h.4e7maaressthe m fractionofrfaCctOio2nenotfeCriOng2 etnhteemrinaginthcoemparienscsomrapnrdesseocroannddarsyeconmdpareyscsomr,prersepsseoctri,vrelsyp.eTchtievmelya.ssTfhleowmassfl rate of mraetehaonfemretqhuainredretoqupireodvidtoe pthroevnideceetshsaernyetcheesrsmarayl tehneerrmgyaliesnerg,yanisdH H, aVnf disHthHeVhf iigshtehre hig Energies 2020, 13, 5043 heating hveaalutiengofvmaleutehaonfem. PetChCainset.hPeCCtoitsaltheelectotrtiaclalelpecotwriecralrepqouwireerdrefoqruiCreOd2 fcoormCpOre2scsoiomnpdreusrsiinogn dur sequestrsaetiqoune.sPtraetvioionu. sPlrietevriaotusrelithearastsuhroewhnasthshaot wthne tshpaetcitfhice pspoewceifricrepqouwirerdrefoqruicroemd pforerscsoiomnparnedssion a refrigerarteiofrnigoefraCtOio2nforf CseOq2uefosrtrsaetiqounesatra1t5ioBnaratis1510B7akrWis/1k0g7CkOW2 /[k4g1]C, wO2hi[c4h1]i,swuhsiecdh iins tuhsiesdwinortkh.is wo Equation(15)showsthetotalheatreleasedbythecombinedfuelcellreactions;∆hCO,CO2 and This powTehrisispkoewpet rzeisrokewpht eznersoeqwuheesntrasetiqouneisstrnaotitoanssisesnsoetda. ssessed. ∆hH2,H2O are the mole specific enthalpy changes from the oxidation of CO and H2, respectively. (h− h)(h−0−.4h7()h−0−.4h7()h−0−.5h3()h−−0.5h3)(h−−h )− ɳ=ɳ.= . (1) H = − .1− .n ∆h +n ∆h (15) 6 of 20 fc fu fc CO CO,CO H H,HO 2 2 2 2 After the fuel cell, the remaining fuel passes into the fuel-lean combustion chamber to generate more thermal energy for transfer to the sCO2 stream via an indirect heat exchanger. Equation (16) shows the fuel-lean combustion reaction. In Equation (16), the stoichiometric coefficients a2, b2, and γ2 depend on stoichiometry a and b from Equation (3) and on the ηfu. Thus, if the fuel-rich combustion produces b moles of H2 and a moles of CO and b1 and a1 moles of H2 and CO, respectively, react in the fuel cell reaction, then a2 equals the difference between a and a1 and b2 equals the difference between b and b1. Fixing the Φ of the fuel-lean combustion determines the value of γ2. The assumption and expectation is that CO2 and H2O generated in the fuel-rich combustion, FFC, and the fuel-lean combustion reactions remain unreacted downstream of when they are produced. a2 CO+b2 H2 +γ2O2 → a2 CO2 +b2 H2O (16) 2.1.3. FFC sCO2 Turbine Hybrid with and without Carbon Sequestration Figure 3 shows a schematic of the proposed FFCTH system, where the sCO2 turbine receives heat input from the FFC via an indirect heat exchanger. The optional air separation unit provides oxygen to the FFC and after-burner, with the resulting exhaust requiring only water removal to be sequestration-ready. Figure 3. Schematic of the proposed FFC integrated sCO2 turbine hybrid. Use of FFC, instead of a conventional DC-SOFC, significantly reduces system complexity and size. The FFCTH has several tunable parameters, such as Φ, the FFC operating voltage/current, the air separation unit, and sCO2 cycle variables. Examples of the latter are the pressure ratio and the turbine inlet temperature. All these tunable variables enable optimizing for a high power-to-heat ratio (P/H), high electrical efficiencies, and/or high thermal efficiencies. One key advantage of the system proposed PDF Image | Hybrid Fuel Cell Supercritical CO2 Brayton Cycle CO2 Storage
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