Overgas Inc.

Sofia, Bulgaria

Overgas Inc.

Sofia, Bulgaria
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Sheng Y.,University of Leeds | Benderev A.,Bulgarian Academy of Science | Bukolska D.,Overgas Inc. | Eshiet K.I.-I.,University of Leeds | And 15 more authors.
Mitigation and Adaptation Strategies for Global Change | Year: 2015

This paper presents the outcome of a feasibility study on underground coal gasification (UCG) combined with direct carbon dioxide (CO2) capture and storage (CCS) at a selected site in Bulgaria with deep coal seams (>1,200 m). A series of state-of-the-art geological, geo-mechanical, hydrogeological and computational models supported by experimental tests and techno-economical assessments have been developed for the evaluation of UCG-CCS schemes. Research efforts have been focused on the development of site selection requirements for UCG-CCS, estimation of CO2 storage volumes, review of the practical engineering requirements for developing a commercial UCG-CCS storage site, consideration of drilling and completion issues, and assessments of economic feasibility and environmental impacts of the scheme. In addition, the risks of subsidence and groundwater contamination have been assessed in order to pave the way for a full-scale trial and commercial applications. The current research confirms that cleaner and cheaper energy with reduced emissions can be achieved and the economics are competitive in the future European energy market. However the current research has established that rigorous design and monitor schemes are essential for productivity and safety and the minimisation of the potential environmental impacts. A platform has been established serving to inform policy-makers and aiding strategies devised to alleviate local and global impacts on climate change, while ensuring that energy resources are optimally harnessed. © 2014 Springer Science+Business Media Dordrecht


Sheng Y.,University of Leeds | Green M.,UCG Engineering Ltd | Hristov N.,Overgas Inc.
Proceedings of Institution of Civil Engineers: Energy | Year: 2012

Coal-fired power plants still have a sizeable 'carbon footprint', despite advances in technology that have made them 'greener'. On the other hand, many of the world's coal reserves are also lying unused because the seams are simply too deep to dig out. Researchers at the University of Leeds, together with leading Institutions from Bulgaria, Germany, Greece and Portugal, hope to solve these problems by exploring a greener, safer and cheaper way of using coal from deep underground seams as an energy source in a E3 million project funded by the Research Fund for Coal and Steel of the European Commission. Under the proposed underground coal gasification scheme, coal would be gasified underground to generate combustible gases, offering a new lease of life to coal seams that are too expensive to mine. The depth is sufficient for underground coal gasification to be combined with carbon dioxide capture and geological storage in the dense phase to fulfil the objectives of 'low-carbon' energy supply and energy security envisaged in the 2007 UK Energy white paper, Meeting the Energy Challenge.


Sheng Y.,University of Leeds | Hristov N.,Overgas Inc. | Green M.,UCG Engineering Ltd.
Proceedings of Institution of Civil Engineers: Energy | Year: 2012

Researchers at the University of Leeds, together with Institutions from Bulgaria, Germany, Greece, and Portugal, are exploring a greener, safer and cheaper way of using coal from deep underground seams as an energy source in a project funded by the Research Fund for Coal and Steel of the European Commission. Under the proposed underground coal gasification scheme, coal would be gasified underground to generate combustible gases, offering a new lease of life to coal seams that are too expensive to mine. The depth is sufficient for underground coal gasification (UCG) to be combined with CO2 capture and geological storage in the dense phase to fulfill the goals of low-carbon energy supply and energy security envisaged in the 2007 UK Energy white paper, "Meeting the Energy Challenge." The current project will ensure that the process can be performed in a controllable, reliable, and environmentally sustainable manner, and that production cost can be kept below that of traditional fossil fuel conversion techniques so that UCG could be a feasible technique for industrial and commercial applications.

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