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Scientists poke holes in carbon dioxide sequestration. Physics Today 2012;65(8):22e4. [32] The future of coal e options for a carbon constrained world. Massachusetts Institute of Technology; 2007. p. 192. [33] Buhre BJP, Elliott LK, Sheng CD, Gupta RP, Wall TF. Oxy-fuel combustion technology for coal-fired power generation. Progress in Energy and Com- bustion Science 2005;31(4):283e307. % Preheating 0 10 20 30 CO2 exit Working fluid reject temperature, C temperature, C 20 118 55 109 65 72 85 23 Author's personal copy A. Ram Mohan et al. / Energy 57 (2013) 505e512 511 power generated from the EGS in all the cases is substantially sufficient to recover the power lost to recompress CO2 for subse- quent recirculation. 7. Conclusions Pairing IGCC with EGS, in addition to producing electricity from the organic Rainkine cycle, recovers the work done to compress the CO2 from IGCC for sequestration. This process facilitates the simultaneous sequestration of CO2 and extraction of geothermal heat and is particularly attractive in arid regions where scarce water need not be expended. Among the four fluids R134A, ammonia, n-Butane and neopentane used for process modeling of ORC, the power generated (49 MWe) and the efficiency (23%) at which it is generated is highest for ammonia. The possible tem- perature at which CO2 was discharged from the binary heat exchanger was highest for R134A and lowest for n-butane. Considering the corrosive nature of working fluid, ozone depletion potential and greenhouse gas potential, n-Butane and neopentane can be considered as the potential candidates for the working fluids in ORC. Addition of the preheater facilitates the extraction of heat from the hot outgoing fluid leaving the turbine so that it rejects its latent heat to the condenser at the lowest possible temperature. The recuperator also gives an opportunity to add a second Rankine cycle so that more power can be generated discharging both the CO2 and the working fluid at the lowest possible temperatures. Acknowledgment This material is based upon work supported by the United States Department of Energy under Award Number DE-EE0002739. The authors would also like to thank Drs. Vis Visvanathan, Yaw Yeboah and Jonathan Mathews for their valuable suggestions. Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. References [1] Mock JE, Tester JW, Wright PM. Geothermal energy from the earth: Its po- tential impact as an environmentally sustainable resource. Annual Review of Energy and the Environment 1997;22:305e56.PDF Image | Energy Technology ORC
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