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Abstract
The present study aims to analyze a combined heat and power (CHP) system with an approach towards exergy analysis and employing biomass gasification. The cycle modeling was carried out using Cycle-Tempo and the main purpose was to achieve parametric analysis of the model. The system’s function was studied by categorizing alternative biomass fuels, also qualitative and quantitative analyses of the biomass fuel samples were presented and considering the trade-off points, most appropriate biomass fuel with respect to exergy efficiency and delivered power were determined. The results indicated that the bagasse and wood chips had the total exergy efficiency of 54.5 and 57.1% in trade-off point, respectively.
NOMENCLATURE
Parameters
| LHV | = | lower heating value, kJ/kg |
| TIT | = | turbine inlet temperature, K |
| E | = | power, kW |
| Ex | = | exergy, kW |
| wt% | = | weight fraction |
| mol% | = | mole fraction |
Acronyms
| SOFC | = | solid oxide fuel cell |
| PSOFC | = | pressurized solid oxide fuel cell |
| ER-PSOFC | = | external reforming SOFC |
| GT | = | gas turbine |
| FB | = | fluidized bed |
| SR | = | steam reformer |
| HP | = | combined heat and power |
| HRSG | = | heat recovery steam generator |
| Bio. | = | biomass |
| NG | = | natural gas |
| HP | = | high pressure |
| LP | = | low pressure |
Subscripts
| Ex | = | exergy |
| in | = | inlet |
| out | = | outlet |
| el | = | electrical |
| p | = | primary flow |
| s | = | secondary flow |
| tm | = | thermo-mechanical |
| ch | = | chemical |
| f | = | functional |
| tot | = | total |
| shaft | = | shaft power |
| ox | = | oxidant |
Greek Letters
| η | = | efficiency |