Control of syngas temperature using a booster burner
AssigneeNexterra Systems Corp.
InventorsHendrick Vandergriendt, Duncan Meade, Yan Li, Nebojsa Plavsic
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Abstract
A method and system for fueling of a burner in a direct-fired device using syngas. A gasifier produces syngas from a carbonaceous feedstock such as biomass. The syngas is fed to a syngas burner. A booster burner disposed between the gasifier and the syngas burner increases the temperature of the syngas. The booster burner may be provided with an approximately stoichiometric or sub-stoichiometric amount of oxidant. Operation of the booster burner may be regulated based on the temperature of the syngas. The syngas burner may be used to direct-fire a device requiring a relatively high flame temperature, such as, for example, a lime kiln.
Claims43
A system in which syngas is supplied as fuel for a burner used to direct-fire a device, the system comprising:
- a gasifier for producing syngas comprising tars;
- a syngas burner for receiving syngas from the gasifier by way of a fluid path;
- a booster burner disposed along the fluid path between the gasifier and the syngas burner for increasing the temperature of the syngas;
- one or more temperature sensors for measuring the temperature of the syngas in the fluid path;
- and
- a controller configured to regulate the operation of the booster burner based on input from the one or more temperature sensors;
- wherein the controller is configured to regulate operation of the booster burner to maintain temperatures of syngas being carried along the fluid path above a first threshold temperature that is higher than a temperature at which the tars condense and to prevent the temperatures of syngas being carried along the fluid path from exceeding a second threshold temperature that is lower than a cracking temperature of the tars.
A method for using syngas as fuel in a burner used to direct-fire a device, the method comprising:
- producing syngas comprising tars in a gasifier;
- carrying the syngas from the gasifier to a syngas burner along a fluid path;
- while carrying the syngas along the fluid path, increasing the temperature of the syngas using a booster burner and regulating operation of the booster burner to maintain temperatures of the syngas being carried along the fluid path above a first threshold temperature that is higher than a temperature at which the tars condense and to prevent the temperatures of the syngas being carried along the fluid path from exceeding a second threshold temperature that is lower than a cracking temperature of the tars;
- and
- burning the heated syngas in the syngas burner.
Dependencies are inferred from the claim text.