1957 Volume 43 Issue 6 Pages 628-632
The furnace chamber of the open-hearth furnace is the place where combustion and heat transfer is performed. The flow in that portion determines the performance of combustion and heat transfer. The burner jet induces vortices which enclose and squeeze the air flow into it.
In the entrance of the chamber, vortex A takes place between the jet and bath, vortices B occupy the spaces both the front and back sides of the jet, and vortex C comes of the return flow under the ceiling and occupies the space between the ceiling and the jet. The burner jet splashes on the bath and runs up the walls towards the roof, in this way vortices D come into being and they link with the vortex C by way of the return fiow.
Model studies on the furnace chamber to get the rational chamber flow explained the following points:
(1) The chamber spaces should be balanced in front and back of the burner line, therefore the distances of the walls from the burner line should be nearly equal.
(2) The shoulder angle (θ) should be 40-60°, and its standard is 53°.
(3) The height of the main roof should be 37-55% of the chamber width. Its standard is 46%, and the smaller ratio will be applied to the larger furnace.
(4) The length of the chamber is not greater than 3 chamber widths, the bath length is about 2.6 chamber widths and about 3 bath widths.