E/MJ : engineering and mining journal . g a dense mixture of coal and air intothe furnace independent of the main air supply. Thiswas found to be a clean method, and a test was madeover a period of eight days. During this time thecoke was reduced from 12 to about 6 per cent, withpromising results; the most important and necessaryconditions still being that of keeping the tuyeres was observed that the small openings (IV-in. pipe)through which the coal was introduced into the furnacerequired little punching, the main trouble being withthe large tuyeres; and by observation through theDibl
E/MJ : engineering and mining journal . g a dense mixture of coal and air intothe furnace independent of the main air supply. Thiswas found to be a clean method, and a test was madeover a period of eight days. During this time thecoke was reduced from 12 to about 6 per cent, withpromising results; the most important and necessaryconditions still being that of keeping the tuyeres was observed that the small openings (IV-in. pipe)through which the coal was introduced into the furnacerequired little punching, the main trouble being withthe large tuyeres; and by observation through theDibley valve, the combustion and the smelting of theore in the furnace could be seen. It was then decidedto use specially designed furnace jackets at the tuyerelevel of the furnace. The design finally adopted isshovra in Fig. 3. The jackets, it will be seen, provide means for a moreeven distribution of the blast, and it was thought thatthey would give better opportunity for combustion atthe entrance to the charge. It was also believed that. B Sec+ion B-B FIG. 3. ONE TYPE OF SPECTIAL JACKETS USED furnace jackets designed on this principle would notbe more expensive than those of regular design, as twotuyere castings, with their joints and machine work,would be dispensed with. The furnace is now equippedwith some of these jackets, but it is too early to state,definitely, the degree to which they are advantageous. Experiments With Narrowed Tuyere Zone Experiments have been made with a standard blastfurnace reduced in width from 52 in. to 36 in. at thetuyere level, with the air blast at various pressures,and melting a variety of furnace charges. Considerablestudy has also been given to modifying the design offurnaces to obtain ideal conditions in smelting. Fig. 4illustrates one of these modifications, and jackets of thisdesign are now being tested on the experimentalfurnace. To summarize the results of the experiments atCopper Cliff and Copperhill, it can be said that underdifficult co
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
