US519787A - Boiler-furnace - Google Patents

Description

(No Model.)v y A W. BRAND.

BOILBB PURNAGB. No. 519,787. .Patented May 15, 1894.

UNITED STATES PATENT OFFICE.

WILLIAM BRAND, OF PITTSBURG, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 519,787, dated May 15, 1894. Application filed March 3, 1894. SerialNo.' 502,160. (No model.)

To @ZZ whom it may concern..-

Be it known that I, WILLIAM BRAND, a resident of Pittsburg,in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Boiler-Furnaces; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to steam boiler furn aces, its object being to provide a means for distrlbuting the heat from the fire chamber along the lower surface of the boiler, and, at the same time, to protect the boiler from too hlgh heat at any one point.

It consists, essentially, in combining with the ordinary cylindrical boiler, a iire or coal .chamber under the forward end thereof having a bridge wall at the rear end of said chamber, a combustion chamber beyond the bridge wall and confined between the bridge wall and a Wall back of the same, and a depending wall between said two walls and above the combustion chamber to forcethe flame and gases down into the combustion chamber and having an arch or roof extending from said depending wall backwardly over the rear wall of the combustion chamber, so that after the ignition of the fire the products of combustion, together with Vthe unconsumed gases and air, will pass over from the bridge wall, strike against the depending wall, and through the heating and intermingling of the unconsumedgases and air they will be brought into condition for proper combustion-` of the gases, which will take place within the combustion chamber back of the fuel chamber, and the flame will then pass backwardly along the boiler furnace, direct contact of the ame and highly heated gases with the boiler above the combustion chamber being prevented by the arch leading backwardly from the depending wall; it being found that bya boiler furnace of this construction the fuel is practically all consumed so that no smoke escapes from the furnace, and that the amount of fuel necessary for heating is materially reduced.

To enable others skilled in the art to make and use my invention, I will describe the `same more fully, referring to the accompanying drawings, in which- Figure l 1s a longitudinal section of a furnace embodying my invention. Fig. 2 is a cross section ou the line :i3- looking toward the front end of the furnace; and Fig. 3 is a cross-section on the line :zz-.fr looking toward the rear end of the furnace.

Like letters of reference indicate like parts in each of the figures.

In the drawings a is the boiler, which is a cylindrical boiler and is illustrated as a tubular boiler having a series of tubes extending longitudinally through the same, though my invention may of course be employed with any suitable form of boiler to which it is applicable. The boiler is supported in the ordinary way within the walls b, and has at the forward end thereof the chimney flue c, and it is not necessary to describe these parts more fully. At the forward end of the boiler is the fuel chamber d, which is formed by the front wall e and bridge wall f between which the grate bars g extend, the fuel chamber having the feeding door h, though the chamber may be fedlin any suitable way, such as by mechanical stokers, if desired. The bridge wall f extends upwardly toward the lower surface of the boiler and beyond the same is the rear bridge Wall 71:, the space between the two walls f and la forming the combustion chamber m. Depending within such combustion chamber is the walln. which is supported on a suitable arch p and extends up along the sides of the boiler between the side walls b b so that the iiame, unconsumed gases, dsc., pass downwardly between the walls f and n into the combustion chamber m. It will be noticed that the depending wall n is formed closer to the bridge wall f than to the wall k, the space between the walls f and n simply froming a down-take iiueleading into the combustion chamber m. Above the rear part of the combustion chamberm and extending backwardly from the dependingwali n is the arched roof or top wall r, which extends from the depending wall n backwardly over the combustion chamber m and preferably to the rear edge of the wall k. Vtfhen the boiler furnace is in use the coal is ignited upon the grate bars g within the fuel chamber d in the ordinary way, air being admitted through the ash pits and through the door h, and the flame and heated products rise and strike the lower surface of the boiler a., traveling along the same. With the iiame IOO and heated products, the unconsumed gases, the carbon held in suspension or smoke, and the air pass over the bridge `wall f and strike against the depending Wall n, being deflected by the same through the flue Z into the combustion chamber m, and the gases and air becoming intermingled in such passage andhighly heated by contact with the heated surfaces both of the fire bridgef anddepending wall fn, as Well as the side wa1ls,`so"th'a"ti as or after they enter the combustion chamber m they unite iwith each other, forming a very high heat within the combustion chamber m, and the highly heated products and iiame therefrom rise from such chamber, striking against the roof r and bridge wall fr in the passage t, traveling thence along the lower surface of the boiler and passing forward through the tubes or iiues to the smoke stack. In this course the highest heat generated is within the combustion chamber m, which is directly below the wall n, and the heated products in passing upwardly from the combustion chamber raise this wall nto a high heat, which is communicated to the incoming gases and air passing downwardly on the other side thereof through the flue Z, and in this way heating the incoming gases and air and materially assisting in the combustion thereof,

it being found that the walls are hield at a high heat and that practically perfect combustion is obtained in the combustion cham. ber, so that the gases passing from the same are simply products of combustion, there being practically no smoke when ythe furnace is operating in normal condition, and a very protects this part of the boiler from too highheat and directs the dame backwardly along the `lwer surface of the boiler.

It is found that in the operation of the boiler a very high and even heat is generated, and that practically no smoke escapes from the furnace except when coal is being fed thereto and the air enters and chills the same, though this can be overcome by the use of theo'rdin nary Stoker.

` What I claim as my invention, and desire to secure by Letters Patent, is

In a boiler furnace, the combination with the boiler, of a fuel chamber at the forward end thereof having a bridge wall, a combustion chamber back of vsaid bridge wall and having a rear bridge Wall, a depending wall between said bridge walls within the combustion chamber, and an arch or roof extending rearwardly from the depending wall over the combustion chamber, substantially as set forth.

In testimony whereof I, the said VILLIAM BRAND, have hereunto set my hand.

-WILLIAM ERAN D.

Witnesses:

Ron'r. D. TOTTEN, J. N. COOKE.

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