High temperature furnace
AssigneeIndugas, Inc.
InventorKlaus H. Hemsath
Life of this patent
Estimating the term…
Abstract
A high temperature, low NO.sub.x industrial furnace coal-fired burners placed in an arcuate heat track conduit which heats an arcuately configured wall member extending through an opening in the heat track conduit. The heated portion of the wall member rotates out of the heat track conduit to indirectly heat a bundle or bank of heat exchange tubes while an unheated wall portion moves into the opening vacated by the heated wall portion. The regenerative heated wall member thus permits the heat exchange tube bundle to be heated to high temperature without exposure to the burner products of combustion. The coal-fired burners are operated substoichiometrically to produce combustibles and a free-standing, jet entrainment arrangement is utilized to achieve staged combustion to avoid NO.sub.x formation.
Claims12
A method for effecting high temperature heat transfer in an industrial furnace system having a heat track conduit with an opening in its inner wall;
- a heat transfer cylinder positioned relative to said heat track conduit so that a portion of its cylindrical surface extends through said opening;
- a cylindrical furnace casing wall extending about that portion of said heat transfer cylinder which does not extend into said opening to define an annular heat transfer space between said casing wall and said heat transfer cylinder, a plurality of heat exchange tubes in said annular space;
- said method comprising the steps of:
- a) providing industrial burners in said heat track conduit and firing said burners to produce products of combustion at high temperature;
- b) heating that portion of the cylindrical surface of said heat transfer cylinder which extends into said opening from said burner's products of combustion;
- c) rotating said heat transfer cylinder so that the heated cylindrical surface portion resulting from step (b) is rotated into said heat transfer space;
- d) heating said heat exchange tubes in said annular space by said heated cylindrical surface portion of said heat transfer cylinder while simultaneously cooling said cylindrical portion when heat is transferred to said heat exchange tubes;
- and
- e) rotating said cylindrical surface portion when cooled by heat transfer to said heat exchange tubes back into said opening for reheating by said burner products of combustion whereby a continuous, regenerative furnace system is provided for indirectly heating fluid in said heat exchange tubes.
Dependencies are inferred from the claim text.