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US 11,008,704 B2Granted
Deposit control for a black liquor recovery boiler
OwnerChrstopher R. Smyrniotis, Ian Saratovsky +2inventors
InventorsChrstopher R. Smyrniotis, Ian Saratovsky, Edward G. Schaub, Scott Bohlen
Life of this patent
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Abstract
Disclosed is a process for reducing slag in a black liquor recovery boiler, the process comprising: injecting and burning black liquor in a boiler by contacting it with primary air and secondary air; introducing a slag-reducing chemical into the gases above the injection locations through interlaced, tangential or concentric secondary, tertiary, and/or quarternary air ports.
Claims9
A process for reducing deposits in a black liquor recovery boiler, the process comprising:
- injecting and burning black liquor in a boiler by injecting it into the boiler and into contact with primary air and secondary air before collecting on a char bed in the boiler near the bottom;
- introducing sprays of deposit-reducing chemicals as droplets from a nozzle positioned within a duct into the gases above the injection locations for the black liquor through interlaced, tangential or concentric secondary, tertiary, and/or quarternary air ports to increase the momentum of the droplets, and adjusting the flow from at least half of the ducts to achieve plug flow and thereby help shield the injected chemical from dispersion before sufficient penetration and permits the air to carry the chemical from 60 to 95% of a distance across the boiler from the point of introduction of the sprays, whereby the flow from at least half of the ducts within the air ports is plug flow.
Dependencies are inferred from the claim text.