. Florists' review [microform]. Floriculture. 22 The Florists^ Review Dbcbmbee 16. 1920 coal consumed, from one-third to one- half of the heat it contains is stolen by the products of combustion and dissi- pated into the atmosphere. The other loss up the chimney, namely that due to unconsumed fuel in the products of combustion, is usually not so serious. The old idea that a smoky stack is a sign of tremendous waste is not always true; in fact, whether the gases leaving a chimney are smoky or smokeless is no indication at all as to the efficiency with which the fuel is Steam boilers,
. Florists' review [microform]. Floriculture. 22 The Florists^ Review Dbcbmbee 16. 1920 coal consumed, from one-third to one- half of the heat it contains is stolen by the products of combustion and dissi- pated into the atmosphere. The other loss up the chimney, namely that due to unconsumed fuel in the products of combustion, is usually not so serious. The old idea that a smoky stack is a sign of tremendous waste is not always true; in fact, whether the gases leaving a chimney are smoky or smokeless is no indication at all as to the efficiency with which the fuel is Steam boilers, for example, connected with a stack that does not show the slightest trace of smoke may burn twice as much coal pfer pound of water evaporated as when smoke is in great prominence. Black smoke is, of course, unburned carbon, but the amount of carbon in this light and finely divided form that is necessary to give the products of combustion a dark or even a black appearance is generally only a small fraction of one per cent of the actual fuel burned. The additional un- consumed fuel that is apt to be present in the products of combustion is carbon monoxide and hydrocarbons, both of which are caused by an insufficient air supply or the improper mixture of the air with the fuel before it is ignited. Although it is possible for the loss due this way be determined at once, and the best efficiency under the working con- ditions of any plant can generally be obtained and maintained without the necessity of lengthy and elaborate tests. / Ideal Combustion. With ideal combustion the rate of burning and consequently the amount of heat energy developed in a unit of time would- be in proportion to the amount of air supplied. Unfortunately, how- ever, conditions under which fuel is burned are far from ideal. In everyday practice air is supplied to the fuel in such excessive quantities that only from one-third to one-half of it combines with the combustible to liberate the heat which it conta
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Keywords: ., bookcentury1900, bookdecad, booksubjectfloriculture, bookyear1912
