F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
F27B 1/08 (2006.01) F27B 1/10 (2006.01) F27B 1/16 (2006.01)
Patent
CA 2088438
91B108/MW ABSTRACT OPERATION OF VERTICAL SHAFT FURNACES A hot coke bed 32 is established at the bottom of a vertical shaft furnace, e.g. an iron melting cupola 2. The cupola 2 is then charged with alternate layers 34 and 36 of ferrous metal and coke respectively. Burners 18 burn hydrocarbon fuel in the presence of a stoichiometric excess of oxygen-enriched air and thus form a hot gas mixture including oxygen. The hot gas mixture passes upwards through the shaft 4 of the cupola 2 thereby providing sufficient heat to melt the ferrous metal. Molten ferrous metal flows downwards under gravity into and through the coke bed 32 and may be removed through a tap hole 28. At least one jet of oxygen is injected into the hot coke bed 32 so as to maintain it at a temperature sufficient to superheat the molten metal. Preferably a fan 11 is operated to dilute with air the combustion gases above the level of the charge in the shaft 4 and thereby create secondary flames. No air blast is supplied to the cupola. A significant degree of superheating can be achieved while keeping down the proportion of environmentally undesirable components (i.e. particulates and carbon monoxide) in the gas exhausted from the cupola.
Gowling Lafleur Henderson Llp
The Boc Group Plc
Westley David R.
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