The Blast Furnace And the Manufacture of Pig Iron An Elementary Treatise for Th
The Blast Furnace And the Manufacture of Pig Iron An Elementary Treatise for Th
Robert Forsythe
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The top of the furnace was formerly left open, and the escaping gases burned with a constant flame. When it was discovered that these gases could be used to heat the blast and to generate power, the bell-and-hopper device was adopted to prevent their escape. A single bell accomplishes this object, except when it is lowered to dump a charge. Of late year? . A double bell system has been widely adopted to prevent all waste of gas. Outlet for the gas is provided at one or several points beneath th...e bell. These out- lets lead into a large tube several feet in diameter, known as the " down comer " or " downtake, " which conducts the gases to the boilers and stoves. In some furnaces there are distributed about the top weighted doors, known as " explosion doors, " which are designed to relieve the pressure, caused by occasional explosions in the top of the furnace. Bell and Hopper. The bell and hopper together form an annular V-shaped depression into which the stock may be dumped. When the bell is lowered the whole charge slides into the fur- nace.
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