The heat efficiency of steam boilers; land marine and locomotive. With tests and experiments of different types, heating value of fuels, analyses of ... and suggestions for testing boilers

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. 1898 Excerpt: ...bad or how good his combustion is. When testing a boiler for smoke, care must be taken that all the smoke goes into the same chimney. TV. Smoke Commission reports.--The last point to be considered, with regard to the question of smoke and its abatement, is the report of the different commissions and committees, who have made trials to determine the conditions under which smokeless combustion can be procured. Two commissions have been appointed in England; an important commission was formed i in Berlin in 1894; and the subject was also care fully studied by Professor Lewicki in his exhaustive report to the Saxon Engineering Association in 1896. In France and America the abatement of smoke is receiving much attention, although no formal committee has been appointed. From whatever side the subject is approached, there are two points to be considered--(1) How far the mechanical appliances tested for diminishing smoke answer that purpose? and (2) To what extent, when there is no smoke, combustion is complete 1 Perfect combustion, that is, the approximation of the actual to the theoretical heat efficiency of the coal, is estimated in two ways. It may either be determined from analysis of the gases of combustion, showing the excess of air, and the percentage of oxygen supplied to that actually combining with the carbon. This may be called the chemical test, and its value has already been pointed out. The other way is by measuring the work done by a given quantity of coal in evaporating water, or the evaporative test. The economy is determined by taking the temperature of the gases out, of water into the boiler, the fuel burnt and water evaporated per lb. of carbon value. These data are necessary to know whether the prevention of smoke may not be purchased at the e...