Clean Coal Utilization Based on Underground Coal Gasification Integrated Solid Oxide Fuel Cells and Carbon dioxide Sequestration

V. Prabu
Indian Institute of Technology Madras, Chennai, India

S. Jayanti
Indian Institute of Technology Madras, Chennai, India

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp11057697

Ingår i: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Linköping Electronic Conference Proceedings 57:17, s. 697-704

Visa mer +

Publicerad: 2011-11-03

ISBN: 978-91-7393-070-3

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


Underground coal gasification (UCG) is a clean coal technology which converts coal into a combustible gas in situ without mining and without bringing up the ash contained in the coal. Thus; the attendant problems of coal washing; ash handling and disposal can be avoided. The combustible gas mixture; consisting primarily of hydrogen; methane; carbon monoxide--all of which are fuels for an solid oxide fuel cell (SOFC) system-- and carbon dioxide; can be fed to a battery of SOFC after gas cleaning to remove hydrogen sulphide and other impurities. A large portion; typically 50%; of the chemical energy contained in the product gas can be converted into electrical energy by the SOFC. The exhaust gases from the SOFC are typically at a temperature of the order of 600 to 800 deg C. Heat energy from these will be extracted to produce steam; part of which will be used for UCG and the rest will be sent for SOFC internal reforming and shifting reactions. The exhaust gases; consisting primarily of carbon dioxide and steam; will be finally fed through a condenser and will then be sent for compression and sequestration. Thus; the overall system envisaged makes use of oxygen-fed UCG and SOFC to generate electrical energy and an exhaust gas consisting primarily of carbon dioxide and the easily condensable steam which enables CO2 sequestration. The overall integrated system can be divided into five units namely underground coal gasification; UCG product gas purification; electrical power generation from SOFC; heat recovery system and carbon sequestration unit. An energy analysis with heat integration of all the systems for a nominal 500 MWt will be discussed.


Underground coal gasification; Solid oxide fuel cell; Carbon sequestration; Heat integration


[1] W.R.Aiman; W.T.Fisher; Lawrence Livermore National Laboratory Insitu coal gasification Program Quarterly Progress Report. January through March 1978; UCRL 50026-78-1

[2] C.B.Thorsness; J R Creighton. Review of underground coal gasification field experiments at HOE creek. Report No.UCRL-87662-Rev.1. U.S.DOE. Livermore; CA: Lawrence Livermore National Laboratory; 1983

[3] P.N.Thompson; Gasifying coal underground. Endeavour 1978;2: 93 -97 doi: 10.1016/0160-9327(78)90062-5.

[4] A.M.Winslow; Numerical Model of coal gasification in a packed bed. Symbosium on combustion (international) 1977:16:503 – 513.

[5] C B Thorsness; E A Grens; A Sherwood; A one dimensional Model for Insitu coal gasification. Report No.UCRL-52523; U.S.DOE.Livermore; CA: Lawrence Livermore National Laboratory; 1978.

[6] M.S.Blinderman; D.N.Saulov; A.Y.Klimenko. Forward and reverse combustion linking in underground coal Gasification. Energy 2008; 33: 446-454. doi: 10.1016/j.energy.2007.10.004.

[7] L Yang; J Liang; L Yu; Clean coal technology – Study on the pilot project experiment of underground coal gasification. Energy 2003;28:1445 – 1460 doi: 10.1016/S0360-5442(03)00125-7.

[8] L Yang; X Zhang; S Liu; W. Zhang; Field test of large-scale hydrogen manufacturing from underground coal gasification. International journal of Hydrogen Energy 2008; 33:1275 – 1285. doi: 10.1016/j.ijhydene.2007.12.055.

[9] G.Perkins; V.Sahajwalla. A Mathematical Model for the chemical reaction of a semi-infinite block of coal in underground coal Gasification. Energy and fuels 2005;19:1679 – 1692 doi: 10.1021/ef0496808.

[10] S.Daggupati; N.Ramesh. R.N.Manadapati; S.M.Mahajani; A.Ganesh; D.K Mathur; R.K Sharma; P.Aghalayam; Laboratory studies on combustion cavity growth in lignite coal blocks in the context of underground coal Gasification. Energy 2010;35: 2374-2386. doi: 10.1016/j.energy.2010.02.015.

[11] W.R.Aiman; M L Donohue; LLL insitu coal gasification project; Quarterly progress Report; Lawrence Livermore laboratory; Report No. UCRL 50026 -79 -3; 1979.

[12] T.Kivisaari; P Bjornbom; C Sylwan; B Jacquinot; D Jansen; A Groot; The feasibility of a coal gasifier combined with a high temperature fuel cell; Chemical Engineering Journal 100; 2004; pp 167 -180. doi: 10.1016/j.cej.2003.12.005.

[13] A.O.Omosun; A.Bauen; N.P.Brandon; C.S.Adijman; D.Hart; Modelling system efficiencies and costs of two biomass-fuelled SOFC systems; Journal of power sources 131; 2004; pp 96 – 106. doi: 10.1016/j.jpowsour.2004.01.004.

[14] S.Ghosh; S.De; Thermodynamic performance study of an integrated fuel cell combined Cycle- an energy analysis; Journal of Power and Energy 217; 2002; pp 137 -147. doi: 10.1243/09576500360611164.

[15] S.Ghosh; S.De; Energy analysis of a cogeneration using coal gasification and solid oxide fuel cell; Energy 31; 2006; pp 345 – 363. doi: 10.1016/j.energy.2005.01.011.

Citeringar i Crossref