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Publication Title | ORC-Based Geothermal Power Generation and CO2- Based EGS for Combined Green Power Generation and CO2 Sequestration

Organic Rankine Cycle

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Chapter 13

ORC-Based Geothermal Power Generation and CO2- Based EGS for Combined Green Power Generation and CO2 Sequestration

Basel I. Ismail

Additional information is available at the end of the chapter http://dx.doi.org/10.5772/52063

1. Introduction

Electrical power generation using innovative renewable and alternative geothermal energy technologies have shown merits and received renewed interest in recent years due to an in‐ creasing concern of greenhouse gas (GHG) emissions, being responsible for global warming & climate change, environmental pollution, and the limitations and conservation of natural energy resources. Organic Rankine Cycle (ORC) power generation using low-temperature geothermal resources is one of these innovative geothermal power generation technologies. The vast low-temperature geothermal resources found widely in most continental regions have not received much attention for electricity generation. Continuous development of ORC power generation and state-of-the-art drilling technologies and other factors make this renewable and nonconventional energy source one of the best future viable, alternate and available source to meet the required future electricity demand worldwide, significantly re‐ ducing GHG emissions and mitigating global warming effect. The first part of this chapter will introduce the ORC-based geothermal power generation technology. It will also present its fundamental concept for power generation and discusses its limitations, environmental & economic considerations, and energy conversion performance concept. Another novel “dou‐ ble-benefit” technology is enhanced (engineered) geothermal systems (EGS) using CO2 as the working fluid for combined renewable power generation and CO2 sequestration. CO2 is of interest as a geothermal working fluid mainly because it transfers geothermal heat more efficiently than water. While power can be produced more efficiently using this technology, there is an additional benefit for carbon capture and sequestration (CCS) for reducing GHG emissions. Using CO2 as the working fluid in geothermal power systems may permit utiliza‐ tion of lower-temperature geologic formations than those that are currently deemed eco‐

© 2013 Ismail; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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