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Analysis of Organic Rankine Cycles for a Boiler Station

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Analysis of Organic Rankine Cycles for a Boiler Station ( analysis-organic-rankine-cycles-boiler-station )

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Popul ̈arvetenskaplig sammanfattning Klimatfo ̈r ̈andringar till f ̈oljd av m ̈anniskans anv ̈andning av fossila br ̈anslen ̈ar allvarliga och n ̊agot vi b ̈or f ̈orso ̈ka undvika. F ̈or att lyckas med det beh ̈over vi minska v ̊ar anv ̈andning av fossila br ̈anslen, fr ̈amst olja, kol och naturgas som i dagsl ̈aget anv ̈ands f ̈or att producera elektricitet. Elektriciteten produceras genom att br ̈anslets f ̈orbr ̈anns med syfte att koka och f ̈or ̊anga vatten under ett h ̈ogt tryck, varefter vatten ̊angan trycks genom en turbin vilket ger upphov till en rotationsr ̈orelse. Tur- binens rotationenergi omvandlas sedan till en elektrisk effekt med hj ̈alp av en generator. Majoriteten av v ̈arldens elektricitet produceras p ̊a ett s ̊adant s ̈att, och det leder till stora v ̈axthusgasutsl ̈app. F ̈or att minska utsl ̈appen av v ̈atxhusgaser beh ̈over vi d ̈armed byta ut fossilbaserad elproduktion- skapacitet mot f ̈ornybar s ̊adan. Men hur ska vi g ̈ora det? Fritt fl ̈odande energi, i form av fr ̈amst sol- och vindenergi, p ̊ast ̊as av m ̊anga vara l ̈osning p ̊a morgondagens energif ̈ors ̈orjning — men vad g ̈or vi n ̈ar varken solen skiner eller vinden bl ̊aser? Man kan t ̈anka sig att anv ̈andandet av batterier ̈ar l ̈osningen, men en storskalig reglering av v ̈arldens eln ̈at enbart med battrier ̈ar varken h ̊allbar eller tekniskt m ̈ojlig med dagens batteriteknologi. Allra helst skulle vi vilja ha en f ̈ornybar baskraft, som kan producera elektricitet kontinuerligt, dygnet runt. Organiska rankinecykler ̈ar v ̈armemaskiner baserade p ̊a organiska fluider med l ̈agre kokpunkt ̈an vatten. De till ̊ater elproduktion med v ̈armek ̈allor av l ̊ag temperatur (l ̈agre ̈an 400 °C) samt ̈aven av l ̊ag effekt (l ̈agre ̈an 10 MW), f ̈or vilka vanliga ̊angkraftverk ̈ar otillr ̈ackliga. Det ̈ar av stor betydelse eftersom mycket av den tillg ̈anliga va ̈rmeeffekten, s ̊a som spillv ̈arme i industrier och geotermisk v ̈arme, ofta karakt ̈ariseras av att vara av l ̊ag temperatur och men ̈aven av l ̊ag effekt. Av den anled- ningen kan organiska Rankinecykeler spela en viss roll i begr ̈ansningen av klimatf ̈or ̈andringarna. I det ha ̈r arbetet studeras b ̊ade den tekniska genomf ̈orbarheten och ekonomiska l ̈onsamheten av att implementera en organisk rankinecykel i ett fj ̈arrv ̈armeverk i s ̈odra Sverige. F ̈ordelen med att till ̈ampa organiska rankinecykler i just fj ̈arrv ̈armeverk ̈ar att det medf ̈or en h ̈og energiverkningsgrad, till f ̈ojd av att den v ̈armeenergi som inte omvandlas till elektricitet kan tas omhand om och anv ̈andas i fj ̈arrv ̈armen ̈atet. F ̈or att bed ̈oma den organiska rankinecykelns p ̊averkan p ̊a fj ̈arrv ̈armeverket, och l ̈onsamheten, skapas en modell av fj ̈arrv ̈armeverket med v ̈armemaskinen integrerad i systemet. ii

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