This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1885 Excerpt: ...feet. As, further, the fixed carbon, or the coke
which remains after the volatile portions of the fuel are driven
off, averages 60 per cent, or 60 lbs. per 100 lbs. of coal, the
proportional quantities of air chemically required for the volatile
and fixed portions respectively may be simply ascertained. Sixty
pounds of carbon require 160 x 60 = 9,600 cubic feet of air--say
10,000 cubic feet, and the proportions are therefore as follows:
--Volatile elements 6,000 cubic feet. Fixed element, or coke....
10,000 Total air per 100 lbs.... 16,000 cubic feet. Or 160 cubic
feet of air per pound of coal. Of this supply, three-eighths are
consumed by the volatile elements and five-eighths by the fixed
element. It is easily conceivable, therefore, in view of so large a
demand in behalf of the volatile or smoke-making elements, that the
complete combustion of these elements is a matter involving some
care to effect the ultimate mixture of the gases and air, which is
necessary to effect the complete combustion of the gases. In order
to prevent the formation and discharge of smoke, it is necessary to
admit a greater quantity of air to the furnace than is chemically
consumed, so that each particle of gaseous combustible matter may
be supplied with its due equivalent of oxygen. The proportion of
such surplus air may, in ordinary furnaces, amount to as much as
the air chemically consumed, and thus upwards of 30,000 cubic feet
of air may be needed for the combustion of 100 lbs. of coal, or 300
cubic feet for one pound. Temperature of Combustion. The
temperature of the products of combustion at the instant of their
formation varies, of course, with the quantity of air in dilution.
Professor Bankine estimates the temperature to be as follows:
--Carbon. TM Fuel, undiluted ...
|Country of origin:
Daniel Kinnear Clark
||246 x 189 x 4mm (L x W x T)
||Paperback - Trade
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