Techno-economic analysis of solid oxide fuel cell-based combined heat and power systems for biogas utilization at wastewater treatment facilities

Abstract This paper presents a techno-economic analysis of biogas-fueled solid oxide fuel cell (SOFC) systems for combined heat and power (CHP) applications in wastewater treatment facilities (WWTFs). SOFC-CHP systems ranging from 300 kWe to 6 MWe in electric power capacity are explored in terms of their performance and life cycle costs. Representative biogas feedstock is established from compositional data for a large wastewater reclamation facility in Denver, Colorado. A steady-state SOFC-CHP system model is developed with Aspen Plus for the integration with small (640 kW LHV ), medium (2.97 MW LHV ) and large (11.92 MW LHV ) biogas sources. The proposed SOFC system concept includes anode gas recirculation, a biogas pretreatment system, and a waste heat recovery unit. The system offers a net electrical efficiency of 51.6% LHV and a net CHP efficiency of 87.5% LHV. The effect of operating parameters on system efficiency is investigated with a parametric study. The economic performance is evaluated with the levelized costs of electricity (COE) and heat (COH). The results are compared with the COE from reciprocating engine, gas turbine, microturbine, molten carbonate fuel cell technologies, and grid electricity prices. The influence of economic parameters and stack operating parameters on the levelized COE is also presented.

[1]  Robert J. Braun,et al.  Techno-Economic Optimal Design of Solid Oxide Fuel Cell Systems for Micro-Combined Heat and Power Applications in the U.S. , 2010 .

[2]  François Maréchal,et al.  Energy balance model of a SOFC cogenerator operated with biogas , 2003 .

[3]  J. Jechura,et al.  Biomass to Hydrogen Production Detailed Design and Economics Utilizing the Battelle Columbus Laboratory Indirectly-Heated Gasifier , 2005 .

[4]  A. T. Holen,et al.  A Norwegian case study on the production of hydrogen from wind power , 2007 .

[5]  S. Barnett,et al.  Direct operation of solid oxide fuel cells with methane fuel , 2005 .

[6]  Feridun Hamdullahpur,et al.  Effects of Fuel Processing Methods on Industrial Scale Biogas-Fuelled Solid Oxide Fuel Cell System for Operating in Wastewater Treatment Plants , 2010 .

[7]  Y. Sung,et al.  Tungsten oxide bilayer electrodes for photoelectrochemical cells , 2010 .

[8]  R. O’Hayre,et al.  Fuel Cell Fundamentals , 2005 .

[9]  Y. Bultel,et al.  Direct methane solid oxide fuel cell working by gradual internal steam reforming: Analysis of operation , 2009 .

[10]  Marc Melaina,et al.  Design and technoeconomic performance analysis of a 1MW solid oxide fuel cell polygeneration system for combined production of heat, hydrogen, and power , 2012 .

[11]  K. Sasaki,et al.  Feasibility of direct-biogas SOFC , 2008 .

[12]  B. Ahn,et al.  Biogas Purifying for Application of MCFC , 2007 .

[13]  Klaus D. Timmerhaus,et al.  Plant design and economics for chemical engineers , 1958 .

[14]  Roberto Bove,et al.  Analysis of a solid oxide fuel cell system for combined heat and power applications under non-nominal conditions , 2007 .

[15]  Andrea Lanzini,et al.  Experimental investigation of direct internal reforming of biogas in solid oxide fuel cells , 2010 .

[16]  R. Remick,et al.  Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis , 2010 .

[17]  I. Celik,et al.  Tolerance tests of H2S-laden biogas fuel on solid oxide fuel cells , 2010 .

[18]  K. Sasaki,et al.  Internal reforming SOFC running on biogas , 2010 .

[19]  Qingxi Fu,et al.  Syngas production via high-temperature steam/CO2 co-electrolysis: an economic assessment , 2010 .

[20]  R. J. Spiegel,et al.  Test results for fuel cell operation on anaerobic digester gas , 2000 .

[21]  José Luz Silveira,et al.  Thermoeconomic analysis applied in cold water production system using biogas combustion , 2005 .

[22]  M. J. Hutzler,et al.  Emissions of greenhouse gases in the United States , 1995 .

[23]  I. Yentekakis,et al.  Catalytic and electrocatalytic behavior of Ni-based cermet anodes under internal dry reforming of CH4 + CO2 mixtures in SOFCs , 2006 .