Abstract
A technical analysis has been completed for a commercial-scale two-stage gasification-combustion system. The CLEERGAS (Covanta Low Emissions Energy Recovery GASification) process consists of partial combustion and gasification of as-received municipal solid waste (MSW) on a moving grate producing syngas followed by full combustion of the generated syngas in an adjoining chamber and boiler. This process has been in operation since 2009 on a modified 330-tonne day-1 waste-to-energy (WTE) line in Tulsa, Oklahoma. Material balances determined that the syngas composition is 12.8% H2 and 11.4% CO, the heating value of the gas in the gasifier section is 4098 kJ Nm-3, and an aggregate molecular formula for the waste is C6H14.5O5. The analysis of gas measurements sampled from the Tulsa unit showed that the gasification-combustion mode fully processed the MSW at an excess air input of only 20% as compared to the 80-100% typically found in conventional WTE moving grate plants. Other important attributes of the CLEERGAS gasification-combustion process are that it has operated on a commercial scale for a period of over two years with 93% availability and utilizes a moving grate technology that is currently used in hundreds of WTE plants around the world.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 772-781 |
| Number of pages | 10 |
| Journal | Waste Management and Research |
| Volume | 32 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2014 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Waste Management and Disposal
- Pollution
Keywords
- Gasification
- large-scale
- moving grate
- municipal solid waste
- NOx reduction
- syngas
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