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ORC-Based Geothermal Power Generation and CO2-Based EGS for Combined Green Power Generation and CO2 323 Sequestration http://dx.doi.org/10.5772/52063 mal installation situated close to a coal-fired power plant), the captured CO2 from the plant back to the EGS reservoir. For example, in a study by (Gurgenic et al., 2008), it was reported can be run through the geothermal reservoir first and then sequestered in a geologic seques‐ that there is a significant potential to use supercritical CO2 as working fluid in the power loop as illustrated (Gurgenic et al., 2008) in Figure 5. Significantly higher energy conversion tration site of choice. efficiencies were predicted using a single-loop system with the CO2 being both the heat CO -based EGS has been examined in (Atrens et al., 2011) from a reservoir oriented perspec‐ 2 exchange and the power cycle working fluid. It was reported (Gurgenic et al., 2008; Atrens et al., 2011) that the loops in either of the two cycles (i.e. subsurface loop and surface power tive, and as a result thermodynamic performance was investigated. It was reported (Atrens loop) do not have to be closed. For example, if there is ready access to CO2 (e.g., at a et al., 2011) that economics of the system are still not well understood, however. In their geothermal installation situated close to a coal-fired power plant), the captured CO2 from study,thtehecpolanotmcaincsboefruthnethCrOoug–hbathsedgeEoGtheSrmteaclhrnesoelrovgoiyrwfirastsaenxdpltohernedsefqouresatnereodptinimaizedpow‐ 2 ture. It wpaesrsfpoeuctnivde, tahnadtaascahriesvualtbthlercmoodlyinagmtiecmpeprfeorramtuanrceiwsasninivmesptiogarteadn.tItewcoasnroempoirctesdite consid‐ geologic sequestration site of choice. er plant design and best-available cost estimation data. It was demonstrated in (Atrens et al., 2011) that near-optimum turbine exhaust pressure can be estimated from surface tempera‐ CO2-based EGS has been examined in (Atrens et al., 2011) from a reservoir oriented (Atrens et al., 2011) that economics of the system are still not well understood, however. In eration alongside EGS resource temperature. The role of sequestration as part of CO2–based their study, the economics of the CO2–based EGS technology was explored for an optimized EGS was also examined in (Atrens et al., 2011), and it was concluded that if fluid losses oc‐ power plant design and best-available cost estimation data. It was demonstrated in (Atrens cur,theectoanl.,o2m01ic1)vtihabtinlietayr-opfttimheumcotnucrbeipntedexehpaeunstdpsrsetsrsuornegclaynobnetehsteimpartiecdefarosmsocsuiarftaecde withCO2 (Atrens et al., 2011). Potential barriers to implementation of CO –based EGS technology in‐ 2 temperature. It was found that achievable cooling temperature is an important economic site consideration alongside EGS resource temperature. The role of sequestration as part of CO2– clude access to CO2 at an acceptable cost, proximity of the EGS to the electricity grid, and based EGS was also examined in (Atrens et al., 2011), and it was concluded that if fluid access tolocssoeosloinccgurw, thaeterc.onSoimiiclavirabisilsituyeosf trhelacotendcepttodelopnengd-stesrtrmongrleysopnotnhseipbriilcietyasfsocriathede resultant with CO2 (Atrens et al., 2011). Potential barriers to implementation of CO2–based EGS reservoir, including the liability for future CO leakage from the geologic sequestration technology include access to CO2 at an acceptable cost, proximity of the EGS to the site.In another study by (Randolph & Saar, 2011), it was suggested that using CO2 as the electricity grid, and access to cooling water. Similar issues related to long-term working fluid in geothermal power systems may permit utilization of lower temperature responsibility for the resultant reservoir, including the liability for future CO2 leakage from geologicthfoergmeoaltoigoincssetqhuaenstrtahtionsesithe.aItnaarneotchuerrestnutdlybdyee(Rmaendolepchon&omSaaicr,al2l0y11v),iaibtlwe,alseadingto suggested that using CO2 as the working fluid in geothermal power systems may permit more widespread utilization of geothermal energy. However, additional exploration of eco‐ utilization of lower temperature geologic formations than those that are currently deemed nomics regarding the opportunities and issues for CO –based EGS technology for combined economically viable, leading to more widespread u2tilization of geothermal energy. carbon seHqouwesvtera, taidodnitaiondal pexopwloerartigoennoefreactoiononmiiscsnreeegdaredin. g the opportunities and issues for CO2–based EGS technology for combined carbon sequestration and power generation is needed. 2 Heat exchange and power single-loop Subsurface Fig. 5. A conceptual model showing a single-loop system with CO2 used for combined heat Figure 5. Aexccohnacnegpetuaanldmpoodwelershcoywclein(gGaursginegnliec-leotoapl.,s2ys0t0e8m). with CO2 used for combined heat exchange and power cycle (Gurgenic et al., 2008). 4. Conclusion An increasing concern of environmental issues of emissions & pollution, in particular global warmingand the constraints on consuming conventional energy sources has recently result‐ ed in extensive research into innovative renewable and green technologies of generatingPDF Image | ORC-Based Geothermal Power Generation and CO2- Based EGS for Combined Green Power Generation and CO2 Sequestration
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