Performance Analysis of an Intermediate-Temperature-SOFC/Gas Turbine Hybrid System Using Gasified Biomass Fuel in Different Operating Modes

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Xiaojing Lv ◽  
Xiaoyi Ding ◽  
Yiwu Weng
Keyword(s):  
Fuel Cell ◽  
Gas Turbine ◽  
Hybrid System ◽  
Wood Chip ◽  
Intermediate Temperature ◽  
Maximum Temperature ◽  
Operating Modes ◽  
Operation Modes ◽  
Safety Characteristic ◽  
Load Conditions

This work used the established mathematic models of an intermediate-temperature solid oxide fuel cell (IT-SOFC) and gas turbine (GT) hybrid system fueled with wood chip gas to investigate the load performance and safe characteristic under off-design conditions. Three different operating modes (mode A: regulating the fuel proportionally, and the air is passively regulated. Mode B: regulating the fuel only. Mode C: simultaneously regulating the fuel and air) were chosen, and the component safety factors (such as fuel cell maximum temperature, compressor surge margin, carbon deposition in reformer) were considered. Results show that when the operation modes A and C are executed, the hybrid system output power can be safely changed from 41% to 104%, and 45% to 103%, respectively. When mode B is executed, the load adjustment range of hybrid system is from 20% to 134%, which is wider than that of two above operation modes. However, the safety characteristic in this case is very complicated. The system will suffer from two potential malfunctions caused by too lower temperature entering turbine and CH4/CO cracking in reforming reactor when it operates in low load conditions. When the system operates in the high load conditions exceeding 130% of relative power, the potential thermal cracking of fuel cell will be occurred.

scholarly journals Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Energies ◽  
2012 ◽  
Vol 5 (11) ◽  
pp. 4268-4287 ◽  
Author(s):  
Anastassios Stamatis ◽  
Christina Vinni ◽  
Diamantis Bakalis ◽  
Fotini Tzorbatzoglou ◽  
Panagiotis Tsiakaras
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
Hybrid System ◽  
Exergy Analysis ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel

Performance Study on Intermediate Temperature Solid Oxide Fuel Cell and Gas Turbine Hybrid System Fueled With Biomass Gas

2017 ◽  
Author(s):  
Xiaoyi Ding ◽  
Xiaojing Lv ◽  
Yiwu Weng
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
Output Power ◽  
Hybrid System ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Detailed Model ◽  
Gas Fuel

In this work, the detailed model of intermediate temperature solid oxide fuel cell (IT-SOFC) and gas turbine (GT) hybrid system with biomass gas (wood chip gas) as fuel was built, with the consideration of fuel cell potential loss such as polarization loss and heat loss. Detailed performance of key component such as reformer, fuel cell and gas turbine of the hybrid system was studied under different biomass gas fuel compositions and steam/carbon ([S]/[C]) ratios. The results show that the hybrid system can reach the efficiency of 59.24% under the designed working condition. The biomass gas from different sources and processes usually have varied fuel concentrations, especially for methane (CH4), hydrogen (H2), carbon monoxide (CO) and water (H2O), which could significantly affect the performance of hybrid system. Results show that the change of H2 proportion has the most significant influence to system output power, CO and CH4 have similar influence trend. System electrical efficiency increases slightly with the change of H2 proportion while decreasing significantly with the increase of CO and CH4 proportion. The increasing composition of CH4, H2 and CO in biomass gas fuel benefits the output power of hybrid system, but results in the higher risk of overheat as well, which might cause safety problems. The composition of water in biomass gas affects the [S]/[C] ratio of system, and results show that maintaining the [S]/[C] ratio at a certain level can guarantee the temperature of key components in the hybrid system below the limits, which can satisfy the safety standards. The results show this technology has a good application prospect. (CSPE)

Fuel-Adaptability Analysis of Intermediate-Temperature-SOFC/Gas Turbine Hybrid System With Biomass Gas

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Xiaoyi Ding ◽  
Xiaojing Lv ◽  
Yiwu Weng
Keyword(s):  
Gas Turbine ◽  
Hybrid System ◽  
Wood Chip ◽  
Intermediate Temperature ◽  
Detailed Model ◽  
Fluctuation Range ◽  
Different Types ◽  
Safety Consideration ◽  
Power Scale ◽  
Composition Fluctuations

Abstract The tolerance and adaptability to various kinds of fuels make intermediate-temperature solid oxide fuel cell (IT-SOFC) and gas turbine (GT) hybrid system one of the most attractive technologies in the future energy market. In this paper, based on a detailed model established on matlab/simulink, a thermodynamic analysis of IT-SOFC/GT hybrid system fueled with different types of biomass gases is presented. During the process of this research, the composition fluctuations of CH4, H2, CO, CO2, N2, and H2O are considered to simulate the practical situation. Operating states of IT-SOFC/GT hybrid system fueled with wood chip gasified gas and farm biogas are compared under the same power scale of 180 kW. Performance and safety evaluations of hybrid system in response to composition fluctuations of wood chip gas and farm biogas are carried out. Results show that the hybrid system can reach an efficiency of 60.78% with wood chip gas and 59.09% with farm biogas. Meanwhile, with each composition of wood chip gas varying from 80% to 120%, the IT-SOFC/GT hybrid system could maintain the electrical efficiency higher than 59%. However, in the case of farm biogas, the efficiency of system drops to as low as 55%. It is also found that composition fluctuations of H2 in wood chip gas and CH4 in farm biogas leave the most significant effects on system performance. For safety consideration, fluctuation range of CH4 in farm biogas should be controlled between 86% and 116%; otherwise, failure of gas turbine would occur due to unsafe operating temperatures. Compared with wood chip gas, operation of IT-SOFC/GT hybrid system with farm biogas requires more water vapor available to prevent failure of the reformer due to carbon deposition.

Performance evaluation of intermediate temperature solid oxide fuel cell-gas turbine hybrid power system

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sushanth Bavirisetti ◽  
Mithilesh Kumar Sahu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
Hybrid System ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Operating Parameters ◽  
Oxide Fuel ◽  
Content Type ◽  
Performance Behavior

Purpose The purpose of this paper is to analyze the performance of the gas turbine cycle integrated with solid oxide fuel cell technology. In the present work, intermediate temperature solid oxide fuel cell has been considered, as it is economical, can attain an activation temperature in a quick time, and also have a longer life compared to a high-temperature solid oxide fuel cell, which helps in the commercialization and can generate two ways of electricity as a hybrid configuration. Design/methodology/approach The conceptualized cycle has been analyzed with the help of computer code developed in MATLAB with the help of governing equations. In this work, the focus is on the performance investigation of a Gas turbine intermediate temperature solid oxide fuel cell hybrid cycle. The work also analyzes the performance behavior of the proposed cycle with various design and operating parameters. Findings It is found that the power generation efficiency of the IT-SOFC-GT hybrid system reaches up to 60% (LHV) for specific design and operating conditions. The cycle calculations of an IT-SOFC-GT hybrid system and its conceptual design have been presented in this work. Originality/value The unique feature of this work is that IT-SOFC has been adopted for integration instead of HT-SOFC, and this work also provides the performance behavior of the hybrid system with varying design and operating parameters, which is the novelty of this work. This work has significant scientific merit, as the cost involved for the commercialization of IT-SOFC is comparatively lower than HT-SOFC and provides a good option to energy manufacturers for generating clean energy at a low cost.

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