Analysis of Operation Parameters in a Dual Fluidized Bed Biomass Gasifier Integrated with a Biomass Rotary Dryer: Development and Application of a System Model
Abstract
:1. Introduction
2. Model Development
2.1. Woody Biomass Characteristics
Proximate Analysis wt% (od) | Ultimate Analysis, wt% (od) | ||
---|---|---|---|
H2O | 0 | C | 51.2 |
Volatile | 84 | H | 6.1 |
Fixed carbon | 15.6 | O | 42.3 |
Ash | 0.4 | N | 0.2 |
- | - | S | 0.02 |
2.2. Process Configuration
2.3. Modelling of the Rotary Drying
- The exhaust gas temperature is assumed to be always higher than wet-bulb temperature (70 °C).
- The heat of vaporization of water is kept constant during the drying using the average temperature between inlet and outlet temperatures.
- The heat loss of the dryer is assumed to be 15% based on the experimental results with a semi industrial rotary dryer [25]. It does not include the heat loss by the exhaust gas.
- The heat transfer coefficient between the drying medium and the biomass is calculated using the correlation proposed by Saeman and Mitchell [26].
2.3.1. Mass Balance of Water
2.3.2. Energy Balance
2.4. Modelling of the Gasification System
2.4.1. Modeling of the Pyrolysis Step
2.4.2. Modeling of the Char-gas Reactions and Reactions among Gases
- Boudouard: C+CO2→2CO
- Primary steam-gas reaction: C+H2O→CO+H2
- Secondary steam-gas reaction: C+2H2O→CO2+2H2
- Steam-gas shift reaction: CO+H2O→CO2+H2
2.5. Energy and Exergy Efficiencies of an Integrated System
Item | Eẋa | Eẋu |
---|---|---|
Biomass Drying | Eẋfg,in − Eẋfg,out | 0 |
Air Preheating | Eẋfg,in − Eẋfg,out | Eẋair,out − Eẋair,in |
Steam Generation | (Eẋfg,in + Eẋpg,in) − (Eẋfg,out + Eẋfg,out) | Eẋsteam,gen |
DFB Gasification | Eẋbiom + Eẋfuel | (Eẋpg + Eẋfg) − (Eẋair + Eẋsteam,con) |
Blower | Elpower | Eẋair,out − Eẋair,in |
Fan | Elpower | Eẋfg,out − Eẋfg,in |
3. Results and Discussion
3.1. The Simulation and Model Validation of DFB Biomass Gasification
3.2. Effect of Gasification Conditions on Gasification Performance
3.3. Effect of Excessive Fuel and Air Supply
3.4. The Effect of Feed Biomass Moisture Content on System Performance
3.5. The Energy and Exergy Analysis of the System
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Puadian, N.; Li, J.; Pang, S. Analysis of Operation Parameters in a Dual Fluidized Bed Biomass Gasifier Integrated with a Biomass Rotary Dryer: Development and Application of a System Model. Energies 2014, 7, 4342-4363. https://doi.org/10.3390/en7074342
Puadian N, Li J, Pang S. Analysis of Operation Parameters in a Dual Fluidized Bed Biomass Gasifier Integrated with a Biomass Rotary Dryer: Development and Application of a System Model. Energies. 2014; 7(7):4342-4363. https://doi.org/10.3390/en7074342
Chicago/Turabian StylePuadian, Nargess, Jingge Li, and Shusheng Pang. 2014. "Analysis of Operation Parameters in a Dual Fluidized Bed Biomass Gasifier Integrated with a Biomass Rotary Dryer: Development and Application of a System Model" Energies 7, no. 7: 4342-4363. https://doi.org/10.3390/en7074342