Fremont, California - Nationwide Boiler Inc. recently completed the retrofit of two 55,000 lb/hr natural gas fired boilers with a common Ammonia-Free CataStak™ selective catalytic reduction (SCR) system at the NRG Energy Center San Francisco. The SCR system utilizes Combustion Components Associates, Inc. (CCA) patented TRIM-NOX® urea injection system and is an urea based solution offered as an alternative to anhydrous ammonia. This system eliminates the need for end-users to store or ...This story is related to the following:HVACSearch for suppliers of: Low Nitrogen Oxide (NOx) Emission Boilers | Fire Tube Boilers