Transactions, Issues 44-461888 Includes its Constitution, by-laws and list of members. |
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212 degrees anthracite coal Area of grate Area of heating Area through tubes Ashworth bars in grates bituminous coal Boiler pressure brick setting bridge wall cent Coal per hour cotton Cumberland coal cylinder escaping gases evaporation per pound fibres flats foot of grate George's Creek grate surface heater heating surface Horse-power developed hour per square inches outside diameter Kind of boiler Kind of brick Kind of coal kind of run live steam Manuf Mass mill motor Number of tubes Ordinary Percentage of ash pound of coal pound of combustible rate of combustion Ratio of grate Ratio of heating Results of Tests shaft spaces and metal spindles square foot steam steam-heating surface stop and kind superheat superheating surface to grate Temperature of escaping Temperature of feed-water tube area vertical boiler Water evaporated Water per hour Water per pound water-heating surface water-tube boiler Width of air wire
Popular passages
Page 71 - No. 60, using Cumberland coal, corroborates this view in the most positive manner. The result obtained in this one case, when reduced to the basis of horizontal boilers giving steam containing one per cent. of moisture, in the manner pointed out for superheating boilers, is an equivalent evaporation of 12.75 pounds of water from and at 212 degrees per pound of combustible. We have a result here which surpasses any given in the paper by horizontal tubular boilers. Vertical boiler No. 58, though of...
Page 76 - Anthracite broken coal is used as a standard, and the comparison is made by determining the percentage of increase or decrease in each case above or below the evaporation with that coal. Table No. 7 gives a summary of the results of those tests which can be treated in this manner. TABLE No. 7. * Increase. If we assume an evaporation of 11.00 pounds of water from and at 212 degrees per pound of combustible for the performance of anthracite broken coal, which seems to be a result within easy reach...
Page 139 - ... derived principally from its generation in the boiler. This opinion seems to have been formed from the observed fact, that the pressure increases in a rapidly-accelerating progression — in other words, the higher the pressure, the more rapid the increase. But it has been satisfactorily proved, that the quantity of fuel required to evaporate a given quantity of water increase...
Page 66 - ... to 1. The ratio of heating surface to grate here is 42 to 1. and the average evaporation per pound of combustible from and at 212 degrees is 11.16 pounds. The best results obtained with anthracite coal in the common horizontal boiler are in cases where the ratio is larger than 9 to 1. From these facts the conclusion is drawn that the highest efficiency with anthracite coal is obtained when the tube opening is from one-ninth to one-tenth of the grate surface. When bituminous coal is burned the...
Page 39 - If there is no further discussion, we will proceed to the next paper, which is "Flood Prevention,
Page 76 - ... for an average percentage of ash in such coal, the above comparison will be applied to an evaporation of 9.79 pounds of water from and at 212 degrees per pound of coal. The performance of the various fuels, expressed in pounds of water evaporated per pound of dry coal, will then be as follows : — NUHBEK DESIGNATING TEST.
Page 88 - Cumberland coal gave about 6 per cent. advantage. The conclusion drawn from these examples is that a considerable advantage attends the admission of air above the fuel when bituminous coal is employed, the amount of gain depending somewhat upon the method employed. There is no advantage in the system when mixtures of anthracite screenings and bituminous coal are used, if earned out according to either the first or fourth methods ; and, finally, little or no benefit is derived when anthracite coal...
Page 74 - A comparison of results obtained from different types of boilers leads to the general conclusion that the economy with which different types of boilers operate depends much more upon their proportions and the conditions under which they work, than upon their type ; and, moreover, that when these proportions are suitably carried out, and when the conditions are favorable, the various types of boilers give substantially the same economic result.
Page 64 - Barrus concludes that a ratio of 36 to 1 provides a sufficient quantity of heating surface to secure the full efficiency of anthracite coal where the rate of combustion is not more than 12 Ibs. per sq. ft. of grate per hour, and a ratio of 45 to 50 to 1 for bituminous coal.
Page 70 - A well-set return tubular boiler should give an evaporative efficiency of nine to ten pounds of water from and at 212 degrees per pound of combustible.