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Full text of "Metallurgy Of Cast Iron"

METHODS   FOR   WORKING   HOT   BLAST   STOVES.          87
work in the stove. This is the plan followed in all modern brick stoves. The gas in leaving the 4C down-comer" is carried through gas mains to V, where it passes the gas valve at X and enters the furnace at H. Before the gas is turned on, the cap K, which closes the gas inlet while the blast is passing through the stove to be heated, is removed and the gas valve slid up so that the end of the pipe at X is about even with the face of the gas inlet. The pipe X, being smaller in diameter than the hole of the gas inlet at H, permits air to unite with the gas as it enters the stove, thereby causing combustion or ignition of the gas at the entrance before it passes to the combustion chamber, where it receives more air by means of the air inlet T, which is opened when the gas is turned on. At T, W and D are seen points at which valves are arranged for opening or closing the passage of air or gas, as the case may be. When the gas is being turned on, the valve I) is opened. As now shown, it is closed so as to prevent any gas escaping up the chimney P. Before the gas is turned on, the valve I) is opened so as to create draft and permit the dead gas and flames to escape through the chimney. The valves T and W are closed when the gas is on, as will be evident to any making a study of the plans shown. In a general way the blast is on a stove for one hour and the gas for three. Three stoves are generally on gas while one is in blast, \inless one is being cleaned of the caked flue dust which rapidly gathers on the combustion chambers for a distance of about twenty feet in height, and on the bottom of the stoves, which have openings as at K and H for getting at or cleaning out the stove, or, if shut off, for repairs.d checkered brickres, etc. It may also beency                :|,