INNOVA Global's Balanced Design Approach to Hot Catalyst Systems

 

Abstract

Few equipment suppliers for gas turbine power generators can claim experience with hot catalyst systems for emissions controls. While there are companies in similar applications, critical differences exist between a simple cycle gas turbine catalyst system and other systems for combined cycle or reciprocating engines.  INNOVA Global has operational experience with catalyst systems for all three power generator types and can help guide the end client in the areas of importance to ensure emissions and noise control is achieved.

Simple cycle (SC) catalyst systems on gas turbines pose a significantly different design challenge from combined cycle (CC) gas turbine catalyst systems. The SC catalyst system must operate in the high exhaust temperature of the gas turbine, typically running in the 875°F to 1050°F range which is above the maximum operating temperature of most conventional NOx reduction catalysts, and therefore, requires cooling tempering air.  SC catalyst systems for high 90+% NOx removal levels require very uniform flows of NOx in the flue gas and highly uniform ammonia reactant distribution, along with precise temperature and velocity profiles. In contrast, the CC catalyst system is usually embedded in the rows of boiler tubes of an HRSG allowing the system designer to place the catalyst system in a lower temperature zone not requiring a tempering air system.

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