The CataStak™ is a portable, low-temperature Selective Catalytic Reduction (SCR) system, capable of reducing NOx emissions by over 90% to less than 5 PPM for gas-fired boiler applications, as low as 2.5 ppm NOx for gas turbine applications, and by over 99% for nitric acid applications.
The CataStak™is available as an add-on for existing and new package watertube boiler, firetube boilers, gas turbines, steam generators, heaters, furnaces and nitric acid plants. The CataStaak SCR system can be installed either vertically or horizontally and has been successfully installed in boiler applications ranging from 800 HP to 200,000 PPH and on gas turbines starting at a size of 0.5 MW. With over sixty successful applications, it is is the most reliable and proven solution the industry has to offer.
75,000 PPH Boiler Installation
CataStakTM SCR System Overview
The CataStak™ SCR System consists of a single-reactor housing with NOx reducing catalyst and a standard ammonia delivery system (pure anhydrous ammonia, aqueous ammonia or urea), Nationwide's patent pending NOx Reduction control system for ammonia control flow and an ammonia injection grid. Ammonia can also be supplied by a vaporizer unit.
Catalyst Features
Nationwide offers either honeycomb or pelletized catalyst, based on the specific application and equipment type. The unique design of the catalyst provides high NOx removal activity, low pressure drop, low SO2 oxidation rate and excellent durability. The catalyst features are key to:
- A high NOx removal level with minimum ammonia slip
- A low activity towards SO2 oxidation, minimizing the risk of fouling downstream equipment
- A high poison resistance ensuring a long and stable service life
Ammonia Delivery System
Nationwide's standard ammonia delivery system consists of the anhydrous ammonia storage, Nationwide's patent pending NOx reduction control system with a mass ammonia control valve and the ammonia injection grid.
Anhydrous ammonia is typically stored in standard 150 lb. gas cylinders. The cylinders connect to a manifold which accommodates up to three cylinders, allowing each cylinder to be isolated and switched over on-line. Anhydrous ammonia gas cylinders are the most cost-effective and practical storage method for most systems, however alternate delivery systems can also be supplied. Contact Nationwide for details.
Ammonia Control Flow Unit
Ammonia flow control components are skid mounted in a compact space-saving arrangement where all operating devices are within close proximity of each other and within easy access for the operator. The patent pending NOx reduction control system includes a vapor ammonia header with a pressure regulator, and a “smart” flow control valve. A dilution air blower is also provided. The flow rate of the ammonia is controlled based on the fuel flow measurements and pre-determined NOx emissions.
Ammonia Injection Grid
The Ammonia Injection Grid (AIG) consists of a header feeding a group of injection lances distributed across the flue gas duct. The AIG provides uniform injection of the ammonia/air mixture over the duct cross section.
The CataStak™ SCR System is designed as a cost-effective answer to reducing stack emissions and has been proven in many types of demanding applications, easily meeting or exceeded NOx emission guarantees. It is designed for stand-alone operation with minimum operator intervention. benefits include:
- Lower GHG - Dramatic reduction in stack emissions
- Easy field retrofit - no burner or fan changes required
- Simple controls - minimum operator intervention
- Low operating costs with stand-alone operation
Read out latest literature about the CataStak™ SCR System and learn how the CataStak™ provides immediate emission reductions.
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