Low nox gas burner with cooled flue gas recycle
AssigneeHoneywell International Inc.
InventorsKurt E. Kraus, Dusty Ray Richmond, Mohammad Reza Mostofi-Ashtiani, Zhili Qin
Life of this patent
Estimating the term…
Abstract
A burner and methods of using the burner. The burner produces a flame from combustion air and fuel gas. Flue gas, also produced, can be withdrawn and recycled to the burner. A cooling or condition gas, such as ambient air, may be mixed with the flue gas to reduce its temperature. The burner may also utilize a stage injection so that a portion of the produced flue gas is recycled internally.
Claims20
A burner configured to receive a fuel gas and a combustion air which react and produce a flame and a flue gas in a combustion zone, the burner comprising:
- a duct configured to remove a portion of the flue gas from the combustion zone as a recycled flue gas, wherein the recycled flue gas is mixed, upstream of the combustion zone, with the fuel gas and the combustion air.
A process for reducing production of NOx gases at a burner, the process comprising:
- injecting a fuel gas into a combustion zone;
- injecting a combustion air into the combustion zone, wherein the combustion air and the fuel gas react and produce a flame and a flue gas in the combustion zone;
- recovering a portion of the flue gas from the combustion zone as a recycled flue gas to be mixed, upstream of the combustion zone, with the fuel gas, the combustion air, or both.
Dependencies are inferred from the claim text.