Specification of Samuel Hall : boilers, furnaces and flues.

  • Hall, Samuel.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Samuel Hall : boilers, furnaces and flues. Source: Wellcome Collection.

    7/22 (page 5)
    Hall's Improvements in Boilers, Furnaces, Flues, $c. possible when the furnaces are at rest. This is done by the rods l and Zx, and levers m'and m , which are attached to them, n and nx are plates placed over the fronts of the ash pits. U, Figures 2 and 3, is an internal longitudinal flue (of which there may be more than one) to receive the flame or heated gases 5 after they have passed underneath the boiler from the furnace; and U1 is a cross flue branching from it right and left near the front of the boiler to convey such flame or heated gases to two external side flues extending from the front of the boiler to the chimney. The operations of these furnaces are as follows:—When the excentrics are 10 put in motion by the revolving of the shafts, the fire-bars are made to move backward and forward as before stated, and the fuel which is put into the hoppers is supplied to and distributed over the whole length of the furnaces by the bars, the right-angled ends of the projections upon them pushing the fuel into the furnaces when moving in the direction towards the fire bridges, 15 and their inclined planes sliding under it on their return without moving it in a backward direction. The quantity of coal required to be supplied is regu¬ lated by the speed of the excentrics, one revolution of them, and of course one stroke of the fire-bars, in about three minutes being in most cases found to supply sufficient. The coal, or the coke into which it is converted, is burnt in 20 its passage over the fire-bars, and the incombustible matters are dropped into the ash pits by occasionally moving the shelves from the horizontal to the vertical position. Figure 2, Sheet 1, shews also an apparatus which is fixed on the boiler A*, for regulating the generation of steam, and preventing the waste of fuel. 25 0 is a box, furnished with two valves P and Q, which is attached by the branch pipe R to such boiler. This box has a short pipe S on one side of it, having a cock T attached to it, to which another pipe S1 is applied to connect the box 0 with the ash pit. The valve P should be weighted according to the pressure at which the boiler is required to work, and the valve Q, should 30 only have a little weight upon it, viz*, as much as is sufficient to cause the steam to descend into the ash pit when the cock T is open. The usual method of checking the generation of steam when it is too high and escaping at the safety valves is to open the fire doors, thereby producing two bad effects, viz*, the cooling of the furnaces, boilers, and flues, by the admission of 35 cold air, thereby injuring them, particularly the boilers, and causing a great waste of fuel as the furnaces, boilers, and flues, must be again heated when the steam is becoming too low and requires increasing. This is not the case with the use of my above-mentioned improved apparatus, the action ’of which is as follows:—When the steam is so high that it would escape into the atmo-