Method for renewed activation of honeycomb-shaped catalyst elements for denitrating flue gases
AssigneeSaarEnergie GmbH
InventorsHeinz-Kurt Dörr, Georg Koch, Walter Bastuck
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Abstract
The invention relates to a method for renewed activation of honeycomb-shaped catalyst elements for denitrating flue gases from fossil fuel-fired boiler plants, specially coal-fired boiler plants in large power stations. According to the invention, each catalyst element if mechanically cleaned using oil and water-free compressed air before mounting. Subsequently, each element is subjected to wet chemical cleaning using fully desalinated water and dried with oil and water-free compressed air. The inventive method enables the activity of used catalyst elements to be increased from less than 50% to more than 83% of original activity.
Claims4
Method for renewed activation of honeycomb-shaped catalyst elements for denitration of flue gases from boiler installations heated with fossil materials comprising subjecting the catalyst elements initially to a mechanical cleaning, followed by a two-step wet chemical cleaning by means of water and a drying process by means of air, wherein each catalyst element is disassembled and treated individually, and where the mechanical cleaning is done with oil-free and water-free compressed air and the wet chemical cleaning is done with completely desalted water, and wherein the wet chemical cleaning consists of a first step when each catalyst element is jetsprayed with completely desalted water and a second step in which the catalyst element is subsequently rinsed with completely desalted water wherein a temporal duration of at least the first wet chemical cleaning step is adjusted via, a pH-value of the produced eluate.
Dependencies are inferred from the claim text.