RANE Vapor Burner Equipment

and Design Details

RAN Eng Vapor Burners are designed to NFPA safety and equipment standards. Each burner system is designed and sized for the specific application. RAN Eng systems utilize variable speed drives for commercial Combustion Air and AMCA B Vapor Blowers. UL certified, Fireye Flame Safeguards manage our systems and verify safe conditions prior to each pilot trial for ignition. A Fireye verifies that no flame is present prior to activating the blowers, and then ensures positive vapor blower burner and stack air purge. On burner piping and stack air purge verification, the pilot is lit and the Maxon Guillotine fuel valve is opened and the vent valve closed cycling fuel to the burner. Thirty seconds after the main burner is lit the pilot is shut down. Dwyer pressure controls match rack and vapor blower flow and proportion airflow. As temperature is attained, airflow is proportioned to burner temperature. Dwyer pressure and Love temperature controllers ensure safe operating conditions always exist. On loss of rack pressure and/or removal of a truck rack switch (skully), the main burner fuel valve is closed and the air vent valve opened, initiating a 60 second post purge of fuel piping, burner and stack. The air and vapor blowers turn off after the post-purge. For additional safety, Selas firechecks redundantly check for burner flashback and a Varec Flame arrestor is provided on the inlet of each unit.

RAN Eng electrical systems are Class I Division II under 18”, the burner may be installed adjacent to hazardous locations. Unlike natural draft enclosed flares, our burners utilize forced combustion air. We additionally use special control schemes and our variable speed blowers to insure steady air/fuel ratios during rapid vapor flow changes. For additional safety, the combustion air blower inlet is elevated to prevent ground vapors from being pulled into the burner, and the burner’s piping and stack are purged before and after every burn.

Our commercial burners are designed for reliability and maintainability. System controls for the Burner and the Equalizer, including the first out annunciator touchscreen are part of every burner. Instrumentation logic is provided via a PLC. Stainless steel, NEMA 4X cabinets, piping, skid and stacks look nice and lower maintenance costs. Bracing and compressible gaskets are added to deaden sound.

Our systems use a RAN Eng Equalizer, to average saturated vapor returned from Stage I gasoline delivery, with the nearly pure air returned from diesel on diesel refueling. However, continued high return vapor concentrations, can still limit burner capacity to burner combustion air-cooling capacity. The variable speed drives allow us to calculate the vapor concentration being burned. When high inlet vapor concentrations are detected, the burner controls automatically operate to reduce Equalizer fuel vapor concentration. This allows increased burner inlet flow and/or vapor capacity.

RAN Eng commercial, air heating line burners are not enclosed flares. Flares usually have large flame arrestor fuel ports with surrounding primary air flow. The edge of the fuel/air stream burns by thermal decomposition to carbon and hydrogen. The carbon burning produces yellow highly luminescent flames and/or a carbon black, sooty, flame with insufficient oxygen. Maxon line burners nozzle mix air prior to combustion; the fuel breaks down by hydroxylation, burning with a bluer less luminous flame. RAN Eng, Maxon line burners have excess air and are so efficient, they are not required to run, time at temperature. Our vapor burners use only a small, self-piloting, intermittent pilot. If our burner does not maintain a flame, the system alarms. Enclosed flares lite from and monitor a separate pilot, a main burner flame may not be maintained. at the burner face. Only with assist gas and time at temperature are enclosed flare burner face flames assured and 10 mg/l expected.