Electrochemical and metallurgical industry . 11. I. r-iiiK srnvK. quite, always run with hot top, and the heat wasted in a hottop is usually enough to run the whole furnace if applied inthe right place—the tuyere zone. With the air blast heatedto 800° or 900° F. all sulphur is burned at and near the tuyeres,and thus the smelting is done by the aid. chiefly, of burningsulphur instead of coke, as is the case in the cold-blast furnace In iron smelting the air blast is heated by the waste carbon monoxide. Little or no such gases escapefrom furnaces smelting the ores
Electrochemical and metallurgical industry . 11. I. r-iiiK srnvK. quite, always run with hot top, and the heat wasted in a hottop is usually enough to run the whole furnace if applied inthe right place—the tuyere zone. With the air blast heatedto 800° or 900° F. all sulphur is burned at and near the tuyeres,and thus the smelting is done by the aid. chiefly, of burningsulphur instead of coke, as is the case in the cold-blast furnace In iron smelting the air blast is heated by the waste carbon monoxide. Little or no such gases escapefrom furnaces smelting the ores of copper, lead, silver andg(jld. In the latter case the Siemens regenerative or brickchecker-work stove cannot, therefore, be used as it is in ironsmelting. In its place, the U-type stove is very largely I shows the exterior and Fig. 2 a longitudinal verticalsection of a hot-blast U-pipe stove, as made by the ColoradoIron Works Co. The I-pipes are made of cast iron, and are so constructcfl. II J VKkTICAI. SECTION OF that they will stand month after month at a low red heat with-out distortion or other damage. In order to provide am|>lcheating surfaces the pipes are cast with longitudinal ribs on theinside. The heating surface necessary for heating an air blast to600° F. may be taken of as and to 800° F. as 0 5 sfjuarefoot for each cubic foot of air to be heated per minute Theextreme ultimate velocity of heated air on leaving the stoveand in the pipes to the furnace should not exceed 5000 iVet perminute. Air expands ^ of its volume for each Fahrenheitdegree added; then fore, w hen heated to 600° F. from 60°normal atmosphere, its volume has become times its original Milimic. .111(1 hence all pipes and tuyeres must have more thandouble the area reijuired for cold air of given amount in\\ eight. The Colorado Iron Works also have devised an oil stoveliot-blast system for copper matting and pyritic furnaces. I
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
