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.

    5/22 (page 3)
    Hall's Improvements in Boilers, Furnaces, Flues, streams or sheets of air, as shewn by arrows, into the fronts of the furnaces to effect the consumption of smoke and inflammable gases as they arise from the fuel. This mode of supplying the air is attended with two advantages, videlicet, it preserves the plates in front of the furnaces from becoming (as 5 they otherwise would do) too hot, and in doing so the air acquires a considerable increase of temperature which predisposes it the more rapidly to combine with and the more accurately to consume such smoke and gases. The minimum quantity of air required for that process is obtained by the regulating plates a and ax, which must be so much opened as to admit precisely as much air as 10 is necessary to prevent the slightest appearance of smoke from the top of the chimney and no more. The air may be heated to a considerable extend pre¬ viously to its passing between these three plates by means of a number of pipes placed in the chimney or in a chamber in the flue leading thereto from the furnace. A, Figure 4, is a portion of a boiler; B is the chimney; c, c, c, 15 a flue to convey the heated gases to the chimney after having passed from the furnace under and around the boiler; d, d, are cast iron or other pipes fixed in the flue c, c9 on the outsides of which pipes the heated gases pass on their way to the chimney; e is a passage for atmospheric air to pass through the insides of the pipes; and /, /, is a channel to convey the air which is heated 20 by passing through them to the front of the fire-place to enter through or between the plates above mentioned into the furnace; II and Hx are plates to form the fronts of the hoppers fixed on axles b and b*9 which may be raised or lowered at pleasure, and kept in any desired position by a pin put underneath them in one of the holes /, /, /, /, and /x, /x, /x, /x, in the hopper sides. 25 I and Ix are two series of as many fire-bars as the widths of the furnaces will admit; they are to be moved to and fro, as hereafter explained, by eccentrics (two of which are shewn by J and Jx) placed on the revolving shafts K and K*. The ends or necks of the shafts, which are round, are supported by carriages placed on brackets, two of the latter being shewn by d and dx. The excentries 30 revolve within the forks e and e* of the fire-bars, and thereby effect the above- mentioned backward and forward movements of such bars, c, c, and cx, cx, are projections on these bars in the form of inclined planes rising from them, and cut in front at right angles with them, g, #,•g, and gx, g*, g*, are pro¬ jections on the sides of the fire-bars to keep them at proper distances asunder. 35 L, L, and Lx, Lx, are bearers put across the ash pit for carrying them. M and Mx are moveable shelves covered with fire brick, the widths of the furnaces respectively, and the ash pits extend underneath these shelves to receive the clinkers or scoria, and any other matters which may be discharged • from the furnaces, h and hx are levers attached to the shelves; and i and ix