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Show DESCRIPTION OF ULTRALOW NOx MODELS ULB = ULTRALOW NOx BURNER (Without steam) Advanced raw gas, staged fuel burner which utilizes natural flue gas recirculation. The ULB will, in many cases, fit in the hole of existing burners. It does not require any additional fuel gas pressure or steam. ULW = ULTRALOW NOx BURNER (With steam) The UL W will normally require a larger burner hole. The UL W does not require any additional fuel gas pressure, but will require low pressure steam (25-60 psig depending on the particular NOx requirements and process variables). ULS = ULTRALOW NOx SYSTEM (With steam and gathering system) The ULS will normally require a larger burner hole. The ULS will not require any additional fuel gas pressure, but will require low pressure steam (25-60 psig depending on the particular NOx requirements and process variables). The ULS includes a gathering system for additional tempering and distribution of the naturally recirculated flue gas. The system can provide the lowest possible NOxnumbers and may be required in certain high temperature applications. The ULS will require a new heater floor or side wall (if side fired). |