Comparative study of combined solid oxide fuel cell-gas turbine-Organic Rankine cycle for different working fluid in bottoming cycle

Abstract Worldwide efforts are being made for evolving viable electricity generation alternative to the traditional fossil fuel based power generation systems and also to enhance the efficiency of existing power generation systems. Studies have been made for integrating fuel cell with gas turbine cycle and Organic Rankine cycle, but there exist possibility of further investigation by incorporating the measures to increase effective energy utilization in the cycle along with consideration of different working fluids in Organic Rankine cycle. In the present paper, a combined cycle system consisting of technologies namely solid oxide fuel cell, gas turbine and Organic Rankine cycle is studied. The considered combined cycle system employs Heat Recovery Steam Generator followed by Organic Rankine cycle as bottoming cycle for recovering the waste heat coming out from hybrid SOFC-GT system through a Heat Recovery Vapour Generator. The considered SOFC-GT system has methane gas being used as fuel which is reformed by both external and internal reformers with anode gas recycling. Here three different working fluids namely R141b, R245fa and R236fa are used in bottoming Organic Rankine cycle for comparing their effects on the cycle performance of proposed SOFC-GT-ORC combined cycle system based on first law of the thermodynamics. Results have been obtained from the computer simulation based on thermodynamic modeling of SOFC-GT-ORC combined cycle and the effects of gas turbine inlet temperature, cycle pressure ratio, fuel utilization factor and ORC turbine inlet temperature are investigated on the cycle performance. The study indicates that the efficiency is increased about 8%-12% by recovering SOFC-GT waste heat through ORC and R236fa is found to be the best in terms of power generation capacity and efficiency of SOFC-GT-ORC system. Outcome from this paper gives insight to the power sector professionals and research community working for evolving efficient and robust power generation alternatives based on the combination of direct energy conversion system and indirect energy conversion system.

[1]  Werner Lehnert,et al.  Modelling of gas transport phenomena in SOFC anodes , 2000 .

[2]  Yunting Ge,et al.  Experimental analysis and comparison between CO2 transcritical power cycles and R245fa organic Rankine cycles for low-grade heat power generations , 2018 .

[3]  Mohammed A. Al-Weshahi,et al.  Working fluid selection of low grade heat geothermal Organic Rankine Cycle (ORC) , 2011 .

[4]  Ali Volkan Akkaya,et al.  A study on performance of solid oxide fuel cell‐organic Rankine cycle combined system , 2009 .

[5]  D. Schneider,et al.  Thermodynamic efficiency improvement of combined cycle power plant's bottom cycle based on organic working fluids , 2018 .

[6]  Maria Navasa,et al.  HEAT TRANSFER IN SOLID OXIDE FUEL CELL ELECTRODES: FROM HEAT SOURCES TO INTERSTITIAL HEAT TRANSFER COEFFICIENT , 2012 .

[7]  E. Stefanakos,et al.  A REVIEW OF THERMODYNAMIC CYCLES AND WORKING FLUIDS FOR THE CONVERSION OF LOW-GRADE HEAT , 2010 .

[8]  S.M.S. Mahmoudi,et al.  Thermodynamic and exergoeconomic assessments of a new solid oxide fuel cell-gas turbine cogeneration system , 2016 .

[9]  Ning Li,et al.  An efficient integration strategy for a SOFC-GT-SORC combined system with performance simulation and parametric optimization , 2017 .

[10]  K. Friedrich,et al.  Analysis of the influence of heat transfer on the stationary operation and performance of a solid oxide fuel cell/gas turbine hybrid power plant , 2018 .

[11]  Javad Hosseinpour,et al.  Effect of recycling on the thermodynamic and thermoeconomic performances of SOFC based on trigeneration systems; A comparative study , 2017 .

[12]  Dengji Zhou,et al.  Control strategy design for a SOFC-GT hybrid system equipped with anode and cathode recirculation ejectors , 2018 .

[13]  H. Ho,et al.  Multi-level modeling of SOFC–gas turbine hybrid system , 2003 .

[14]  Mehdi Mehrpooya,et al.  Optimal design of solid oxide fuel cell, ammonia-water single effect absorption cycle and Rankine steam cycle hybrid system , 2016 .

[15]  Lijun Wu,et al.  Comparative study of waste heat steam SRC, ORC and S-ORC power generation systems in medium-low temperature , 2016 .

[16]  Dariusz Mikielewicz,et al.  Utilisation of waste heat from the power plant by use of the ORC aided with bleed steam and extra source of heat , 2016 .

[17]  S. Shaaban,et al.  Analysis of an integrated solar combined cycle with steam and organic Rankine cycles as bottoming cycles , 2016 .

[18]  G. Naterer,et al.  Thermodynamic modeling of a gas turbine cycle combined with a solid oxide fuel cell , 2008 .

[19]  P. Rodgers,et al.  Energy, exergy and economic analysis of an integrated solid oxide fuel cell – gas turbine – organic Rankine power generation system , 2016 .

[20]  Pranjal Sarmah,et al.  Performance comparison of SOFC integrated combined power systems with three different bottoming steam turbine cycles , 2017 .

[21]  Meihong Wang,et al.  Closed-cycle gas turbine for power generation: A state-of-the-art review , 2016 .

[22]  V. Zare,et al.  A comparative thermodynamic investigation with environmental analysis of SOFC waste heat to power conversion employing Kalina and Organic Rankine Cycles , 2016 .

[23]  Francesco Calise,et al.  Hybrid solid oxide fuel cells–gas turbine systems for combined heat and power: A review , 2015 .

[24]  Masood Ebrahimi,et al.  Combined solid oxide fuel cell, micro-gas turbine and organic Rankine cycle for power generation (SOFC–MGT–ORC) , 2016 .

[25]  Faramarz Ranjbar,et al.  Thermo-environmental and economic comparison of three different arrangements of solid oxide fuel cell-gas turbine (SOFC-GT) hybrid systems , 2018, Energy Conversion and Management.

[26]  Jun Li,et al.  Cycle analysis of an integrated solid oxide fuel cell and recuperative gas turbine with an air reheating system , 2007 .

[27]  Suthida Authayanun,et al.  Design of SOFC based oxyfuel combustion systems with anode recycling and steam recycling options , 2017 .

[28]  Dariusz Mikielewicz,et al.  A thermodynamic criterion for selection of working fluid for subcritical and supercritical domestic micro CHP , 2010 .

[29]  Jamasb Pirkandi,et al.  Thermo-economic performance analysis of a gas turbine generator equipped with a pressurized and an atmospheric solid oxide fuel cell , 2017 .

[30]  George Papadakis,et al.  Low­grade heat conversion into power using organic Rankine cycles - A review of various applications , 2011 .

[31]  S. Tassou,et al.  An experimental investigation on a recuperative Organic Rankine Cycle (ORC) system for electric power generation with low-grade thermal energy , 2017 .

[32]  Tahar Khir,et al.  Energetic and exergetic parametric study of a SOFC-GT hybrid power plant , 2017 .

[33]  A. H. Mosaffa,et al.  Thermoeconomic assessment of a novel integrated biomass based power generation system including gas turbine cycle, solid oxide fuel cell and Rankine cycle , 2018 .