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Waste-gasification efficiency of a two-stage fluidized-bed gasification system
Zhen-Shu Liu1, Chiou-Liang Lin2, Tsung-Jen Chang2
1Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City, Taiwan.
Waste Management (New York, N.Y.)
|December 25, 2015
Summary
This study explored waste gasification using a two-stage fluidized-bed gasifier. Higher temperatures and additives like CaO or activated carbon improved syngas (synthesis gas) quality and yield.
Area of Science:
- Chemical Engineering
- Environmental Science
- Energy
Background:
- Waste gasification is a promising technology for energy recovery.
- Optimizing syngas production requires understanding the impact of operating parameters and bed materials.
Purpose of the Study:
- To investigate the effect of operating temperature and additives (CaO, activated carbon) on syngas composition, yield, and heating value in a two-stage fluidized-bed gasifier.
- To compare the performance of CaO and activated carbon as Stage-II bed materials.
Main Methods:
- Utilized a two-stage fluidized-bed gasifier with simulated waste.
- Varied operating temperatures between 700°C, 800°C, and 900°C.
- Incorporated calcium oxide (CaO) and activated carbon as Stage-II bed materials.
Main Results:
- Increasing temperature from 700°C to 900°C boosted hydrogen (H2) content from 19.4 to 29.7 mol%, alongside increased total gas yield and heating value.
- CaO addition reduced carbon dioxide (CO2) and increased H2 in syngas.
- Activated carbon addition increased methane (CH4) content, total gas yield, and heating value.
Conclusions:
- Higher operating temperatures enhance syngas production in two-stage gasification.
- CaO is effective for increasing H2 production.
- Activated carbon excels at improving total gas yield and heating value.
