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The CataStak™ SCR System is the choice for ultra low NOx emissions compliance. With emission limits continuing a downward trend, a more economical, reliable, easy-to-operate and efficient solution was sought for low NOx performance. After several years of field testing on numerous rental projects, selective catalytic reduction was recognized as the one solution that met all of these objectives: It was reasonably priced, operated unattended with virtually no field failures and reduced emissions to single digit NOx levels. |
The enormous success of the company-developed modular SCR system on Nationwide Boiler's rental fleet suggested to company management that a market existed for a field-retrofit system for package boilers, and thus the CataStak™ SCR System was born.
200,000 PPH CataStak™ SCR System Package Watertube Boiler Installation
Compliance Assurance
The table below highlights a sample of typical performance indicators for package watertube boilers at varying temperatures and NOx requirements. The CataStak™ SCR System resulted in total compliance for each unit, even exceeding current emission limits required by local air quality districts at the time.
CataStak™ SCR System |
Test |
#1 |
#2 |
#3 |
Firing Rate |
100% |
100% |
100% |
Steam Flow (Note #1) |
61,131 lb/hr |
73,050 lb/hr |
65,500 lb/hr |
Boiler Gas Outlet Temp. (Min) |
379 °F |
385 °F |
368 °F |
Boiler Gas Outlet Temp. (Max.) |
550 °F |
614 °F |
570 °F |
Boiler NOx (corrected to 3%) |
25 PPM |
20 PPM |
25 PPM |
Stack NOx (corrected to 3%) |
4 PPM |
2 PPM |
7 PPM * |
Ammonia Slip |
<5 PPM |
<5 PPM |
<5 PPM |
NOx Permitted Limit 5 ppm unless otherwise noted
Note 1 - Steam Flow is based on feedwater flow
*NOx Limit 9 ppm
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