SCR reactant injection grid
OwnerDavid K. Anderson, Michael J. Riniinventors
Life of this patent
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Abstract
A system and method of injecting an ammonia or urea reactant into a flue gas stream in a steam generating power plant that utilizes Selective Catalytic Reduction (SCR) to lower NO.sub.x emissions and more specifically the injection of the reactant in such a manner that a more uniform mixing of the reactant with the flue gas stream is achieved more rapidly thereby increasing the efficiency of the catalytic reduction process and further a method of increasing the amount of reaction that takes place between the reactant/flue gas mixture and the catalytic material.
Claims16
In a fuel-fired steam generator having a furnace volume for the combustion of fuel and air therein and the generation of flue gases thereby and a flue gas flow path for the flow of flue gas therealong between the furnace volume and a downstream release location, a method for mixing a reactant with the flue gas comprising the steps of:
- a. effecting rotational motion of the flue gas along a predetermined portion of the flue gas flow path;
- and
- b. introducing the flue gas and the reactant into contact with one another during the flow of the rotating flue gas along the predetermined portion of the flue gas flow path.
In a fuel-fired steam generator having a furnace volume for the combustion of fuel and air therein and the generation of flue gases thereby, a backpass volume, a horizontal pass for conducting the flue gases from the furnace volume to the backpass volume, a Selective Catalytic Reduction chamber, and a gas duct for further conducting the flue gases from the backpass volume to the Selective Catalytic Reduction chamber at a flue gas pressure and a flue gas temperature, a system for mixing a reactant with the flue gases flowing in the gas duct, the system comprising:
- a. means for effecting rotational motion of the flue gas along a predetermined portion of the flue gas flow path;
- and
- b. means for introducing the flue gas and the reactant into contact with one another during the flow of the rotating flue gas along the predetermined portion of the flue gas flow path.
Dependencies are inferred from the claim text.