平炉の空気力学的構成(V)

Abstract

The air-uptake not only connects the lower furnace with the upper furnace but also determines, in concert with the furnace head, the combustion in the furnace chamber by composing the type of air flow for the burner jet. The furnace head must be arranged from this point of view.The uptake flow is apt to be stronger in the pit-side than in the charging-side. Generally, the double air-uptake causes the unbalanced air flow and the deformed mixing situations. The single air-uptake is preferable for oil-fired open-hearth furnaces as it promotes air mixing under the burner jet.Model studies on the dimensions of the air-uptake in a single air-uptake design explained followings:(1) The uptake width shall be 50-60% of the chamber width, and it is securer to adopt 50%.(2) The uptake length shall be one-third of the chamber width.(3) The uptake width of the central uptake design shall be four-sevenths of the head width, while they are equal in the spread uptake design.