Catalyst arrangement for industrial emissions control and method of assembling same

Abstract

A catalyst arrangement for use with a selective catalytic reduction system includes a frame and a plurality of catalyst elements coupled to the frame. The plurality of catalyst elements is arranged vertically among a plurality of vertical stations. The plurality of vertical stations is successively defined along a height of the catalyst arrangement. The catalyst elements of at least one of the vertical stations are arranged at a plurality of axial positions with respect to an axial direction of a flow of exhaust gases through the selective catalytic reduction system.

Description

BACKGROUND[0001]The embodiments described herein relate generally to industrial emissions control systems and, more particularly, to an arrangement for a catalyst in an industrial emissions control system.[0002]At least some know industrial systems that combust hydrocarbon fuels, such as gas turbines, industrial boilers and furnaces, and reciprocating engines, generate pollutants such as, but not limited to, carbon monoxide (CO), unburned hydrocarbons (UHC), and oxides of nitrogen (NOx). Emissions of such pollutants into an ambient atmosphere must be limited for safe operation.[0003]One known technology for use in controlling stack emissions is Selective Catalytic Reduction. Selective Catalytic Reduction (SCR) is a method of reducing an amount of NOx and CO in the exhaust gas of fossil fuel-fired industrial and electric utility equipment. In at least some known SCR systems, anhydrous ammonia is mixed with the exhaust gas, and the mixture is channeled over a suitable reduction cataly...

AI Technical Summary

Benefits of technology

The patent describes a selective catalytic reduction system for industrial plants that reduces harmful emissions in exhaust gases. The system includes a frame and a plurality of catalyst elements positioned in a vertical arrangement that can be tailored to the specific needs of each industrial plant. The catalyst elements are positioned at different axial positions within the reaction duct, enhancing the efficiency of the system. The method of assembly involves placing the frame within the reaction duct and coupling the catalyst elements to the frame. The technical effects include high efficiency in reducing harmful emissions and customization for different industrial plants.

Problems solved by technology

Emissions of such pollutants into an ambient atmosphere must be limited for safe operation.

Moreover, space in industrial systems is typically limited and / or expensive, necessitating as small of a footprint as possible for the SCR system.

However, the rapid change in cross-sectional area of the inlet duct may result in flow separation and / or recirculation zones, which in turn increases pressure drop and / or non-uniformity of gas flow temperature and velocity over the catalyst.

As a result, performance of the catalyst may vary across the wall, and a useful lifetime of some catalyst elements may be reduced.

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