End Fired Furnaces
From Galvanizing Furnaces
End fired furnaces have been in use for many years. They are excellent choices for specific plant applications with moderate production rates, and they are easy to run and maintain. They are also less expensive to build. However, end fired furnaces must be carefully designed and the kettle wall must be protected with insulation for the first few feet from the burner or rapid erosion of the kettle inner wall will occur. The major portion of heat transfer through the kettle wall occurs in the next several feet (where the flame is radiant). This can easily be seen during meltdown of longer end fired furnaces when the zinc in this region of the kettle is the first to melt.
Even though there has been a lot of conversation about the higher efficiency of the burner itself, it is the overall furnace efficiency that we are interested in. There is also a current myth about the amount of heat transferred to the kettle by the circulating hot gases. All that is needed to expose this myth is a reading of any basic thermodynamics text. It is particularly important that this type of furnace not be over fired, as several of our clients have found at some expense. GTI is careful to choose the proper size burner so that the furnace can not be damaged by increasing the heat output from the burner as has been the case with some designs.