Damper system for heater stack
OwnerAshutosh Garginventor
Life of this patent
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Abstract
In a stack leading from a fired heater, a plurality of damper blades are positioned at a longitudinal location, each blade being at least partly rotatable around its longitudinal axis to regulate flow through the stack. A plurality of controllers is operatively associated with the plurality of parallel blades to effect rotation of the blades. At least one of the controllers is decoupled from the rest of the plurality of controllers and used to independently control at least one but not all of the plurality of damper blades. The damper blades can be parallel or opposed.
Claims15
Apparatus comprising
- a stack, and
- a damper assembly operatively associated with the stack to control draft in the stack, said damper assembly comprising
- a plurality of damper blades extending across a gas flow path for the stack at a longitudinal location, each blade being at least partly rotatable around its longitudinal axis to regulate flow through the stack, and
- a plurality of operators operatively associated with the plurality of damper blades to effect positioning of the blades, wherein the plurality of operators can be the same or different in number from the plurality of blades,
- at least one of said operators being decoupled from the rest of the plurality of operators and independently positioning at least one but not all of the plurality of damper blades.
A method of controlling draft up a stack leading from a fired heater, said method comprising
- providing a damper assembly comprising a plurality of damper blades in a position to regulate flow through the stack, each blade being at least partly rotatable around its longitudinal axis,
- setting a first portion of the plurality of blades in a first flow regulating rotational position which permits little gas flow past the first plurality of blades,
- and setting a second portion of the plurality of blades in the second flow regulating rotational position which permits moderate to high gas flow past the second plurality of blades.
Dependencies are inferred from the claim text.