The steam-engine; being a popular description of the construction and action of that engine; with a sketch of its history, and of the laws of heat and pneumatics .. by Reid Hugo 1809-1872

Author:Reid, Hugo, 1809-1872
Language: eng
Format: epub
Tags: Steam-engines
Publisher: Edinburgh
Published: 1840-03-25T05:00:00+00:00

contain one-fifth of its bulk of carbonic acid. HOIKT, a large quantity of the air which enters a furnace, beino-mixed with this gas before it reaches the part where it should be of service, is thereby rendered unfit for combustion, carbonic acid gas being produced by the previously burned coal. And not only is the air thus contaminated of no use, but it is positively detrimental, carrying off a considerable quantity of heat. Also, it is found that air does not support combustion until it be heated up to a certain point; and that if the air be cold, a quantity of heat is consumed in raising its temperature up to the necessary point; which heat, when it has to be taken from the fuel, may in some cases check the combustion altogether. From these two circumstances, it follows that many combustible bodies which are not in a state to burn in impure air at a low temperature —might burn freely, if the air supplied to them were pure, and heated lefore it comes in contact with them. It appears to be upon these principles that the success of Mr Parkes' scheme, which is detailed in the following extract from the Mining Review, is founded:—

" At a recent meeting of the Institution of Civil Engineers, a paper was read «On the Evaporation of Water in Steam Boilers,' by Josiah Parkes. In the course of a series of experiments, undertaken with the view of diminishing as much as possible the, loss and the nuisance arising from the volumes of unconsumed smoke and soot which are emitted from the chimney, the author discovered that, for effecting this purpose, the air necessary to render the smoke combustible must be given to the uninflamed gas, and not allowed to become vitiated by passing over inflamed fuel; and also that it must be administered at the point of the greatest heat, the temperature of incan-descence, at least, being necessary for its inflammation. Under these circumstances the furnaces were reconstructed and the air admitted at the bridge ; and this alteration was attended with great success. The effect of different modes of firing

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