Product Overview | Hot Dog ™ Burners
Bulletin 6855 Page 2
Hot Dog Burner Car Thawing Assemblies provide a fast and economical means of heating hopper cars for easier dumping of frozen loads of coal, ore, and other bulk materials. The car hoppers and sides are heated both by convection, from a stream of hot air mixed with the products of combustion which flow through the perforations in the Hot Dog covers, and by radiation from the flame and the red hot alloy covers. This combination of convection and radiation heating promotes rapid thawing without subjecting the journal boxes to excessive temperatures. Furthermore, fuel costs are reduced when compared to thawing pits or electric heating, which depend on radiation alone. 6855-4 Hot Dog Burners combine the 6422 Nozzle-Mix Burner with the time-proven 6856 firing trough. This combination results in a reliable, low maintenance unit that can be supplied with automatic lighting, electronic flame supervision, and the ability to control the burner input from a remote locati on . OPERATING CHARACTERISTICS The burner fires the length of the firing trough, on which two covers rest end to end. A baffle plate at the far end of the trough forces the hot flue gases to escape through perforated holes in these covers. When the weather resistant refractory lining of the trough becomes hot, it directs radiant energy toward the car. The 6855 Burner will operate equally well on either excess air or stoichiometric air/fuel ratio. It is ruggedly constructed to withstand the elements and contains provisions for flame supervision and either a gas pilot or direct spark ignition. For this reason, car thawing sheds can be equipped with remote pushbut- ton start up, thereby eliminating the need for the operator to light each burner manually. NO THAWING PITS REQUIRED Hot Dog Burners do not require pits, thereby avoiding not only drainage problems, but the possible hazard of someone acciden- tally stepping into one. SPECIFICATIONS Nominal Input: Approximately 600,000 Btu/h HHV, when operat- ing on stoichiometric ratio. The burner may also be operated with up to 10% excess fuel which, along with induced secondary air, increases the input to 660,000 Btu/h HHV. Main Air Capacity: 5400 scfh at 16 osi.
Typical Hot Dog installation. Ignition: A 4055-M Direct Spark Igniter is recommended for gas only. Otherwise, a 4011-12 pilot set is recommended for indi- vidual burner ignition. When multiple burners share a single pilot pre-mix header, a 4021-12 pilot tip per burner with an appropri- ately sized air/gas mixer is recommended. Flame Supervision: A flame rod or UV cell may be used when firing gas only. A UV cell may be used when firing dual fuel or oil only.
A weather shield is provided with the burner, which protects the igniter and flame detector from the elements.
Hot Dog Burner covers are constructed of a corrosion resistant, high temperature alloy. Retainers have been installed to hold the covers in place even if the burner is mounted at a 45 degree angle. In addition, the trough is sloped to provide for natural drainage of rain water or melted snow. INSTALLATION & SELECTION Hot Dog™ Burners are normally installed four-across; two between the rails and one on either side, 5½' from the tracks centerline. The outer burners should be mounted on 6856-R ris- ers, (2 required per burner). The number of burners required for an installation depends on the number and length of cars to be thawed at one time. When plan- ning the burner layout, allow a 5½' length for each burner and a 4' space between burner rows (four burners across).
Atomizing Air Capacity: 430 scfh at 4 osi for burning gas. Atomizing Air Capacity: 800 scfh at 14 osi for burning oil.
Fuels: Natural gas, propane, coke oven gas and distillate fuel oils. Required gas pressure at the burner is less than 2 osi. Required oil pressure at the burner is less than 4 osi.
Burner with weather shield removed. Shown with optional (recommended) Sensitrol ™ Oil Valve.
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