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US 4,789,531 AGranted
Method of removing nitrogen oxides (NO.sub.x) from gases, especially flue gases
AssigneeSteag Aktiengesellschaft
InventorsAndreas Eichholtz, Helmut Weiler
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Abstract
NO.sub.x is removed from flue gases by contacting same in the presence of active coke/active carbon and a reducing agent, e.g. NH.sub.3, CO or H.sub.2. According to the invention, the adsorbent is precharged with the reducing agent, thereby increasing the surface area over which the adsorbent can react with the flue gas and decreasing the levels of gas-reducing agent which must be used and which may appear in the cleaned gas.
Claims12
A method of removing NO.sub.x from a flue gas, comprising the steps of:
- forming a traveling bed of solid, carbon-containing adsorbent in an adsorption reactor;
- feeding said NO.sub.x containing gas into said adsorption reactor and treating the gas in said reactor with a reducing agent so as to remove NO.sub.x from said gas;
- passing a stream of said carbon-containing adsorbent through a precharging unit and precharging said stream with the reducing agent such that the reducing agent permeates substantially throughout the adsorbent;
- feeding said adsorbent precharged with reducing agent into said adsorption reactor so that 50% to 100% of the reducing agent required for the removal of NO.sub.x in the gas is precharged in the adsorbent;
- and
- contacting and reacting the gas in the reactor with the reducing agent of the traveling bed of precharged adsorbent so as to catalytically extract NO.sub.x from the gas.
3 more elements
Dependencies are inferred from the claim text.