Sustainable ultra-low nitrogen oxide boilersProblem: Pratt Industries, a corrugated box and container manufacturer in Lathrop, California, sought to update its boilers to meet the air district’s limits of 2.5 ppm NOx and 10 ppm ammonia. Solution: Hurst Boiler’s Ultra Low NOx boiler produces steam that consistently produces 2 ppm NOx or less. The project involved a Series 500, four-pass wetback scotch steam boiler with 250 psig design steam pressure operating at 200 psig. The boiler is rated at 24,000 pounds of steam per hour. The natural-gas-fired low NOx burners need no flue gas recirculation. The manufacturer partnered with Boiler & Steam Performance, Weishaupt
