US 298534 A
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( N0 Model.) 2Sheets-Sheet 1.
Patented May 13. 1884.
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ODELL IVILSON, OF CLEVELAND, OHIO.
SPECIFICATION forming part of Letters Patent No. 298,534, dated May 13, 1884:.
Application filed October 29, 1 883.
To aZZ whom it may concern.-
Be it known that I, OnnLL WrLsoN, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.
These improvements relate to furnaces for steam-boiler, smelting, or other purposes; and they consist in the construction and arrangement of air-flues, in combination with the smoke-fines and fire-walls, whereby air is admitted from without and becomes heated and is discharged at the point of combustion where the gases and smoke from the fire are consumed, the object being to provide a means of enhancing combustion and to avoid waste of fuel by consuming all the combustible material contained in fuel, as hereinafter described and claimed.
In the accompanying drawings, Figure 1 is a perspective view of asmelting-furnace, having portions of the outer walls broken out to show the interior construction of fiues. Fig. 2 is a longitudinal section of the same. Fig.
3 is a horizontal section of the same; Fig. 4, a longitudinal and vertical section of a steamboiler, showing arrangement of air-flues as adapted to that purpose. Fig. 5 is ahorizontal section through the flues, showing their arrangement for conducting and discharging heated air at the connection of the fire-fines with the fire-box.
A is a firebox of the usual construction, provided with ash-pit and grate.
Instead of the usual bridge-wall, I construct a series of smoke or fire fines and airducts, which occupy, in a smelting-furnace, a suitable proportion of space between the firebox and the smelting-oven, as seen in Figs. 1, 2, and 3; but in a boiler-furnace they occupy the full distance under the boiler from the fire-box to the rear end of the boiler. The said fiues may be constructed in the masonry, and preferably so in case of all statio'nary furnaces, but may be constructed of iron in the case of movable or portable furnaces, as locomotives and the like. These flucs are arranged in two coursesone above the otherand the fire flues arranged alternately with the air-fines, whereby the air shall be- (No model.)
come heated in its course through said airfines.
As shown in all the figures, the smoke-fines lead straight through from the fire-box into the oven, or to the back space at rear of boiler, so that the fire has a direct and unobstructed passage. The air-fines are arranged and so connected as to lead the air back and forth from the outer into a central flue and discharge heated air through gratings or openings in a transverse fines at the point where the fire enters the oven, or at the point where the fire first enters the smoke-flues, directly from the fire-box, as in the boiler-furnace. This discharges hot air at the points of combustion, supplying oxygen for completing the consumption of the gases.
In Figs. 1, 2, and 3 the air is admitted from without through an opening, B, in the two side walls, which leads into the side flues, G O. The air passes along in the direction indicated by the arrows. It passes thence into flue D, backward and into flue E, thence into the central flue, F, thence into the transverse flue G, the upper side of which is provided with openings through which the air escapes or discharges. In Figs. 4 and 5 the course of the air is reversed for discharging the air in front. In the walls at the sides of the fire-box are also provided perpendicular air flues, in which air is also conveyed to the same point of combustion, as auxiliaries to the beforedescribed fiues for the supply of heated air.
A steam-jet may be injected at the air-inlets for the purpose of giving greater force to the draft of air.
It has been customary to heat the air-supply of furnaces by means of fines located above the fire-box, also by lines beneath the working chamber or bed of furnaces. My construction and arrangement of fines, however, is novel. My air-fines are constructed to receive at a point between the fire-box and the smokestack and conduct it forward to or near to the fire-box, and then back through shallow return-fines. Said return air-fines are located beneath the smoke-exit fines. They may communicate with other deep fiues leading toward the fire-box, and at that point dis charge into other shallow return-flues. Thus 2. The combination, in a furnace, of the large air-inlet flues, the intermediate shallow return air-fines, and the smoke-fines located above the return air-flues and between the large lines, and a series of flues constructed in the side walls of the fire-box, conveying the heated air to the point of combustion, 20
substantially as described.
E. WV. LAIRD, GEO. W. TIBBITTS.