Supercritical CO2 Cycle for ICE Waste Heat Recovery

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Supercritical CO2 Cycle for ICE Waste Heat Recovery ( supercritical-co2-cycle-ice-waste-heat-recovery )

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Processes 2020, 8, 216 Processes 2020, 8, x FOR PEER REVIEW Processes 2020, 8, x FOR PEER REVIEW 6 of 23 Figure 6. T-s diagram of the split-flow recompression S-CO2 cycle. Figure 6. T-s diagram of the split-flow recompression S-CO2 cycle. Figure 6. T-s diagram of the split-flow recompression S-CO2 cycle. 2.52.5S.pSlpitl-iFt-lFowlowExEpxapnasniosnionofotfhtehSe-SC-OCOC2yCcylecle 2 2.5. Split-Flow Expansion of the S-CO2 Cycle ThTehleaylaoyuotuotfotfhtehsepslpitl-iflt-ofwlowexepxapnasniosinonS-SC-OCOc2yccylceleanadnditsitTs-Ts-dsidaigargarmamaraersehsohwownnininFiFgiugruerse7s 7 2 The layout of the split-flow expansion S-CO2 cycle and its T-s diagram are shown in Figures 7 anadn8d,r8e,srpescptievcetilyv.eIlyn.thInistchyicslec,ytchle,fltohweifsloswpliitsatspstlaitea6tasntadteth6enanmdixtehdenatmstiaxted4.aOtnsteaptear4t.wOonrkeinpgart and 8, respectively. In this cycle, the flow is split at state 6 and then mixed at state 4. One part fluwidorflkoinwginfglutihdrofluogwhinthgetLhTroRuagnhdtheatLeTrRcaannadchieavterthceanhigahcheisetvceyctlheetehmigphersattucyreclaet tsetamtepe1r.aTtuhreen,at working fluid flowing through the LTR and heater can achieve the highest cycle temperature at itflstoawtes1in.tTohtehne,tiutrfbloinwes1i(nTtBo-t1h),eatnudrbthineee1nt(hTaBlp-1y),oafnwdorthkienegnflthuaidlpiyscofnwveorrtkeidnigntfoluwidorisk.cTonhveerxthedauisntto state 1. Then, it flows into the turbine 1 (TB-1), and the enthalpy of working fluid is converted into stewaomrkis.cTohoeleedxihnatuhsetHstTeaRmanidscoolerd,siuncctehsesiHveTlyR.Tahnedoctohoelrepr,arstuwccoersksinvgelflyu.iTdhieshoethaeterdpianrthweoHrTkRing work. The exhaust steam is cooled in the HTR and cooler, successively. The other part working anfdlutihdeinsflhoewatsedinitnothetHuTrbRinaen2d(tThBe-n2)fltowdsoiwntorkth.eThtuerebxinheau2s(tTgBa-s2o)ftothdeoTwB-o2riks.cTohoeleedxihnauthsetgLTasRof fluid is heated in the HTR and then flows into the turbine 2 (TB-2) to do work. The exhaust gas of antdhemTixBe-d2 iwsicthootlheedfiirnsthpearLtTwRoarknidngmflixueidawtistthateh4e.fTirhstepratritowoofrthkeinmgaflsusifldoawt sintathee4T. TBh-2eprraetsioenotfinthe the TB-2 is cooled in the LTR and mixed with the first part working fluid at state 4. The ratio of the thme taostsalflmowasisnfltohwe TinB-t2heprceyscelnetisindtehfienteodtalsmthaesspflloitwraitnioth(SeRc)y.cle is defined as the split ratio (SR). mass flow in the TB-2 present in the total mass flow in the cycle is defined as the split ratio (SR). Figure 7. Operating principle of the split-flow expansion S-CO2 cycle. TB-1 and TB-2: turbine 1 and 2. Figure 7. Operating principle of the split-flow expansion S-CO2 cycle. TB-1 and TB-2: turbine 1 and Figure 7. Operating principle of the split-flow expansion S-CO2 cycle. TB-1 and TB-2: turbine 1 and 2. 2. 6 of 23 6 of 23

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