Process and plant for lowering the residual carbon content of ash
AssigneeOutotec Oyj
InventorsNikola Anastasijevic, Guenter Schneider
Life of this patent
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Abstract
A process for lowering the carbon content in ash includes introducing the ash having a carbon content of 1 to 20 wt.-% into a reactor where the ash is burnt at a temperature between 700 and 1100° C. Fuel is also introduced into the reactor. During combustion, microwave radiation is fed into the reactor. At least part of the energy released during the combustion is recovered.
Claims11
1-10. (canceled)
A process for lowering the carbon content in ash, comprising:
- introducing the ash having a carbon content of 1 to 20 wt-% into a reactor where the ash is burnt at a temperature between 700 and 1100° C.;
- introducing fuel into the reactor;
- feeding, during combustion, microwave radiation into the reactor;
- and
- at least partially recovering energy released during the combustion.
The process according to claim Ii, further comprising at least partially utilizing the energy released in the reactor for steam generation.
A plant for lowering the carbon content in ash, comprising:
- a reactor including a gas supply system configured to entrain the ash from a stationary annular fluidized bed, which at least partly surrounds the gas supply system, into a mixing chamber using gas flowing through the gas supply system;
- a solids conduit configured to feed the ash into the reactor;
- a microwave source configured to feed microwave radiation into the reactor through the gas supply system;
- a fuel conduit configured to feed fuel into he reactor;
- and
- a unit configured to recover energy disposed downstream of the reactor.
Dependencies are inferred from the claim text.