US2336226A - Attachable boiler furnace - Google Patents

Description

D. 7, 1943. J. COOK 2,336,226

, ATTACHABLE BOILER FURNACE I Filed Sept. 2, 1942 5 Sheets-Sheet 1 5 Sheets-Sheet 2-" J. cooK ATTACHABLE BOILER FURNACE Filed Sept. 2, 1942 Dec. 7, 1943.

Dec. 7, 1943. J. cooK ATTACHABLE BOILER FURNACE Filed Sept. 2, 1942 3 Sheets-Sheet 3 6o 88-; u 77a, .25

Patented Dec. 7, 1943 UNITED STATES PATENT -OFFICE ""2, 336,226

ATTACHABLE BOILER FURNACE John o onnurra q nv. v 1 Application September '2, 1942 Serial No. 457,101 (01. 122 4) 13 Claims.

This invention relates to an improved smokeless boiler-furnace, andjmore particularly to an attachment for any conventional type of furnace whereby the latter is convertedinto a smokeless boiler-furnace and caused to function more eniciently than in its normal condition.

Present day boilersare wasteful, since they do not consume all the gases and therefore waste heat, a good proportion of the unconsumed gas escaping through the smoke-stack.

One of the objects of my invention is to provide an attachment for boiler-furnaces of the conventional type with a view of increasing the efiiciency of the latter and at the same time consume all gases and soot escaping from the burning fuel.

Another object of my invention is to provide a smokeless boiler-furnace in the form'of an attachment and place the combustion chamber thereof in communication withthe combustion chamber of any conventional type of boiler-furnace and thus heat the water within the attachment and within the boiler of the conventional boiler-furnace with the fuel consumed in the attachment.

Another object of my invention is to provide what may be termed an auxiliaryboiler-furnace and connect the water space or spaces thereof- With the boiler or water space or spaces of a conventional type of boiler-furnace and the combustion chamber of the auxiliary furnace with the combustion chamber of the conventional type of boiler furnace; utilizing the smoke-stack of the latter as a means of creating the necessary draft;

within the two combustion chambers.

A further object of my invention is to provide a boiler-furnace designed for connection with the smoke-stack of a conventional type of boilerfurnace through the medium of the combustion A further object of my invention is to provide an auxiliary boiler-furnace designed to be placed in front of a conventional type of boiler-furnace and to so attach the same to the'la-tte'r that the fire pots of both are in communication and so that the heated water of the auxiliary boilerfurnace will be led to a high point or points; of-

the boiler in the conventionalboiler-furnace and receive water at a low point or points returned from a low point'or points of the boiler of the conventional boilerfurnace and thus assure rapid circulation and increased steam generation in the boiler of the conventional boiler-furnace over what could possibly be generated therein if fire were "maintained in the fire-box of the conventional boilerfurnace in the usual way.

A still further object of my invention is to provide an auxiliary boiler-furnaceor attachment for a'conventional type of boiler-furnace having a water-jacketed horn projecting into the fuelfeed opening 01" the conventional boiler-furnace so as to serve as a bridge-wall for the auxiliary boiler-furnace or attachment and as part of a connection leading to the smoke-stack of the conventionalboiler-furnace.

Other objects of my invention will be apparent from the following description.

' In the drawings Fig. -1 is a front view of my improved auxiliary boiler-furnace or attachment as applied to a conventional type of boiler-furnace, which latter may hereinafter also be referred to as a main boiler-furnace. l

Fig. 2 is a rear view of my improved auxiliary boiler-furnace or attachment.

Fig. 3'is a sectional elevation of my improved auxiliary boiler-furnace and a conventional type of horizontal boiler-furnace connected together; my improved auxiliary boiler-furnace being shown in elevationand the conventional or main boiler-furnace in I longitudinal -section.

Fig. 4 is a transverse sectiontaken on line 44, Fig. 3, on an enlarged scale. i

' Fig; 5 is a longitudinal section taken on line 5-'5, Fig. l, looking in the direction of the arrow crossing said line, the front wall of a conventional boiler-furnace being also shown in section in connection therewith to illustrate the waterjacketed horn of the auxiliary boiler-furnace or attachment enteredin the fuel-feed opening of the conventional or main boiler-furnace.

Fig. 6 is atransverse section through one-half of the width of the auxiliary boiler-furnace, taken on line 6-6, Fig. 5 and looking in the direction of the arrow crossing said line.

Although my improved auxiliary boiler-furnace orattachment is adapted for use in conjunction with any conventional type ofboilerfurnace, or for use in connection with hot-water heaters, I have in the accompanying drawings illustrated a horizontal boiler-furnace in which thenumeral "l designates the front wall'." This wall'may'be unjacketed, as shown in Fig. 3, or

it may be water-jacketed as shown in Fig. 5. In the particular boiler-furnace illustrated, the boiler, designated by the numeral 8, is of the type designed to project through the front wall I and its rear end is spaced from the rear wall (not shown) of the boiler-furnace in the usual manner so as to provide the riser 9 from the rear end of a passage l leading from the fire-box H to the rear end of the boiler, so that the products of combustion, either created in or drawn through the fire-box, will pass over the bridge Wall l2 into the passage Ill and through the latter and its riser 9. .From the latter the products of combustion pass through the fiues of the boiler and escape into the smoke pipe I3, which is led to a chimney in the usual way. The front wall I of a conventional or main boiler-furnace has the usual fuel-feed opening M, the door of which (not shown) will be opened or removed when connecting my auxiliary boiler-furnace attachment thereto.

I5 designates the fire-grate beneath which the ash-pit I6 is located. The latter is provided with the usual door opening I! closed by a door l8 and to guard against draft through the fire-box II and the passage Ill from the ash-pit l6, fire brick l9 are placed upon the fire grate and cemented at the seams. These fire brick provide a solid Wall on the fire grate which may, however, be created in any other approved manner so long as it guards against the passage of air currents through the fire grate.

There are many other types of horizontal boiler-furnaces and there are many types of vertical boiler-furnaces, but in all instances a firebox and a combustion chamber above or adjacent the fire-box is provided, and a smoke-pipe or stack is connected with a chimney; the pipe or stack being, of course, in communication with the fire-box and combustion chamber through direct or indirect passages, conduits, fines, or ways for properly establishing the necessary draft and providing for the escape of the products of combustion while heating the water within the boiler; and from the following description it will be apparent that my improved boilerfurnace or attachment is adapted to be applied to any of these various types of boiler-furnaces,

or to water-heaters, particularly since the fuelfeed opening of such boiler-furnace or waterheater, as the case may be, is utilized as the means of connection between such furnace or heater and my auxiliary or supplemental boilerfurnace or attachment.

Where, however, no such fuel-feed opening is provided because of designing the boiler-furnace for the use of gas, oil, or similar fuel; or where such last-mentioned fuels are employed in boilerfurnaces originally designed for burning coal or other bulk fuel and the fuel-feed opening has been closed, any other opening may be formed in the conventional boiler-furnace so as to open directly into the fire-box, the combustion chamber, or the passage leading to and through the main boiler-furnace between the fire-box and the smoke-stack, and into this opening the specially designed horn of my improved auxiliary boiler-furnace or attachment, to be hereinafter more specifically defined, may be entered.

My improved auxiliary boiler-furnace or attachment is small compared to the conventional or main boiler-furnace with which it is designed to be connected, since its water-capacity is limited and thus will quickly be heated and conveyed to the boiler of the main boiler-furnace. While the water capacity of my auxiliary boiler-furnace or attachment is comparatively small; the water chambers, jackets, and spaces thereof are separated from each other and so disposed with reference to the fire-box, the combustion chamber, and the burning fuel in the fire-box that all gases and soot are completely consumed by converting them into flames; the flames and extreme heat resulting therefrom escaping from the auxilary boiler-furnace and entering the main boiler-furnace for contact with the boiler thereof so that the efficiency of the latter is measurably increased over what could possibly take place were fuel consumed in the ordinary manner within the fire-box of the main boiler-furnace.

Provision is also made for'supplying oxygen to the-fuel so as to cause the unconsumed gases to be forced out of the coal into the combustion chamber, where they are consumed. Moreover the various chambers, jackets, and spaces containing water in the auxiliary boiler-furnace or attachment become highly heated and the heated water or steam, into which the water is mostly converted underthe extreme heat provided, is taken off high points of said chambers, jackets and spaces and led to a high point or points of the boiler within the main boilerfurnace; provision being made for returning Water from a low point or points of the latter to low points of the chambers, jackets, and spaces of the auxiliary boiler-furnace, thereby providing a rapid circulation of Water and increasing the steam capacity of the main boiler over what could take place if the fuel were consumed directly under the main boiler or in any usual relation to the main boiler.

The intense heat applied to the water chambers, jackets, and spaces of the auxiliary boilerfurnace causes steam to be generated within the latter and practically little or no Water is in reality driven from the auxiliary boiler-furnace into the boiler of the regular or main boilerfurnace.

These and other distinguishing features, taken with constructive details and relative arrangement of parts will be apparent from the detailed description of the auxiliary boiler-furnace now to follow.

20 designates the auxiliary boiler-furnace or attachment considered as a whole. It has a front wall 2|, a rear wall 22, side walls 23 and 24 and a dome or top wall 25. The auxiliary boilerfurnace or attachment is divided transversely at its lower end into three parts by vertical walls 26 and 21 which extend from the floor or base upwardly a pre-determined distance. Between the upper ends of these Walls the main grate 28 of the furnace is arranged. This main grate is rockable on a center 29 and it has a depending portion 30 to which a shaker bar 3! is pivotally secured. Said shaker bar extends through the front wall 2i and is pivotally secured at its outer end to the lower end of a shaker lever 32, which in turn is pivotally secured to a bracket 33 extending outward from said furnace wall. This lever has a short horn extending upwardly beyond the bracket for attachment thereto of a socketed handle, such as usually provided with boiler-furnaces, so that the necessary leverage will be provided for easily shaking the grate without providing permanently afiixed and long projecting parts liable to cause injury to an attendant.

The main grate 28 is supported by the vertical walls 26 and 21 and extending outwardly from each wall is a shelf 34 to support the ends of auxiliary grates 35, one above each space35 between a vertical wall 26 or 27 and the side wall 23 or 24 spaced therefrom. The space between the vertical walls 26 and 27 serves as an ash pit 31 for the fuel on the main grate 28, while the spaces 36 outsideof said vertical walls serve as ash pits for the fuel on the auxiliary grates.

The bars of the auxiliary grates are angular, as best shown in Figs. 4 and 6, the outer portions 38 being inclined downwardly and inwardly, while the inner portions 39 are horizontally disposed and their upper edges preferably alined with the upper face of the main grate; said inner portions receiving support from the shelves 34, while the outer ends are pivotally secured, as at 40 to the front and rear walls 2| and 22. The bars of each of the auxiliary grates are, of course, separated from each other, as is common in fuel-supporting grates, and they may be connected together between their ends b connector members 4|.

The front wall 2| is provided with a door opening 42 leading to the combustion chamber, designated 43, and this opening is closed by a door 44 suitably hinged so that when open, a complete view of the burning fuel may be had. The front wall also has a door opening 45 leading to the space above the horizontal inner portion of each auxiliary grate 35 and these are closed by doors 46. The ash pits 35 and 31 are provided with door openings 4! closed by doors 6. Thus it will be apparent that access may be gained to all portions of the interior of this auxiliary boilerfurnace through the front wall. Each side wall comprises a lower vertical portion 53 and an upwardly and outwardly inclined upper portion 54 suitably connected to the lower portion by welding or otherwise.

Each of the auxiliary grates 35 has a shaker bar 55 pivotally connected thereto, as at 56. These shaker bars extend outwardly through the side walls and their outer ends are pivotally attached to a shaker lever '1 pivotally secured to a bracket 58 extending outward from the side wall. Each shaker lever 51 has an upwardly and outwardly extending short horn 59 to which a manipulating handle, such as previously referred to, may be applied for conveniently shaking the grates.

The upper portion 55 of each of the side walls is in the form of a water-jacket 60 through which a horizontal series of tubes 6| are passed which serve as air ducts, and slidably arranged against the outer sides of these water-jackets are damper-plates 62 which have openings 63 formed therein adapted to be moved into or out of registration with the air ducts 6|. These damperplates are slidable between guide ways 64 fastened to the outer sides of the water-jackets. Each damper-plate may have a handle 65 by means of which it may be easily adjusted. Upon opening the air ducts 6|, free air is admitted to the spaces above the auxiliary grates, which spaces serve as fuel chambers, as will appear hereinafter.

Air openings or ducts 66 are also formed through the upper ends of the lower portions of said side walls 23 and 24 and these openings or ducts have damper-plates 61 arranged to close them or to open them to any extent desired. For this purpose, these damper plates are provided with openings 68 which may be brought completely or partly into registration with the air openings or ducts 66, and ifdesired these latter openings or ducts may be entirely closed by said damper plates. The damper-plates 51 are also slidable in guide ways 59. riveted or otherwise secured to the outer sides of said walls and they have handles Til by means of which they can be conveniently manipulated. The upper portion of the front wall 2!. may be waterjacketed, as shown at 'l I, while the lower portion, not subjected to the heat of the fuel within the boiler-furnace, may be unjacketed.

The dome or top wall 25 receives support from the rear and front walls and is preferably formed of fire brick. It may have an outer layer 12 of sheet or cast iron. The side edges of this dome or top wall terminate short of the side walls, or more particularly, short of the inner surfaces of the water-jackets 60 to provide openings l3 used as fuel-supply openings, as will be more definitely set out hereinafter.

Extending downwardly and, inwardly from the side edges of the dom or top wall 25 are waterchambers 74. They are spaced apart to form the combustion chamber 43 and they are also spaced from the water-jackets 60 to form fuel chambers 16. It is to be noted that these fuel chambers gradually widen downwardly transversely, because of the fact that the water-chambers it are at a somewhat greater angle to the vertical than the water-jackets 6!).

The lower ends of these water-chambers are spaced from the lower or inner ends of the auxiliary grates 35 and are so disposed with reference to the main grate 28 that the two supplies of fuel within the fuel chambers at opposite sides of the boiler-furnace remain separated, as clearly shown in Fig. 4. Each supply or body of fuel inclines downwardly and inwardly from the lower ends of the water-chambers M and thus the flames from the inclined surfaces of the fuel come in contact with each other and mix with air or oxygen rising upwardly through the thin layer of fuel on the main grate and with the air or oxygen passing through the auxiliary grates and upwardly through the burning fuel; also with air admitted through the air ducts i3! and passing through the fuel.

The fuel may be kept at the level indicated in Fig. 4, but this is not necessary. Preferably, covers l1 hinged at W partially close the upper ends of the fuel chambers 75. When the fuel supply is at maximum, these covers may rest upon the fuel, but as the level of the fuel lowers, the covers are held in horizontal position by stop lugs Itiwhich bear against said water chambers. These covers may clos the upper ends of the fuel chambers, or may be dispensed with if desired.

The upper ends of the water-jackets 69 and water chambers F4 are connected by hot water or steam pipes l9 and 59, respectively, with manifolds SI connected with the boiler 8 of the conventional or main boilerrfurnace at a high point or points thereof, preferably at the level of the water within the boiler. The lower ends of said water-jackets and water-chambers are connected by return or cold water pipes 82 and 3-3, respectively, with a manifold 84, which may be disposed transversely underneath the boiler 8 and which is connected by a pipe 85 with the boiler 8 at a low point thereof.

The rear wall of the auxiliary boiler-furnace or attachment has its upper portion water-jacketed so that the products of combustion from the fuel impinge against this water-jacketed portion and materially aid in the heating of the water or generation of steam. Extending outwardly from this water-jacketed portion is a projecting horn 86, preferably tapered outwardly with a parallelsided terminal 87 adapted to be entered in the fuel door in the front wall of the conventional or main boiler-furnace, which wall may be waterjacketed, as shown in Fig. 5, or be unjacketed as shown in Fig. 3. In each instance, however, this horn serves as a connector between the auxiliary boiler-furnace and the conventional or main boiler-furnace, regardless of what type the latter may be. This horn opens directly into the firebox or combustion chamber of the main boilerfurnace and since the grate of the main boilerfurnace is covered, as described, so as to prevent the passage of air upwardly therethrough, this fire-box or combustion chamber serves merely as a continuation of the passage It in the main boiler-furnace and its riser 9 and the horn serves as a bridge wall for the combination boiler-furnace shown and described.

It is to be noted that this horn is also waterjacketed and that the interior thereof opens directly into the water-jacketed upper-portion of the rear wall of the auxiliary boiler-furnace or attachment. The lower portion of said rear wall is unjacketed because it is not subjected to the heat of the burning fuel within the auxiliary boiler-furnace or attachment.

The upper end of the upper water-jacketed portion of the rear wall 22 has a hot water pipe 88 connected thereto which may be led to one of the manifolds 81, or as shown in Fig. 1, directly to a high point of the main boiler 8, and the lower end of said rear wall portion has a cold water or return pipe 89 connected thereto which is led to the manifold 84. Therefore, all waterjacketed portions of the casing of the auxiliary boiler-furnace or attachment are or may be connected by hot water or steam pipes with a high point or points of the boiler of the main boilerfurnace and by cold water or return pipes with a low point or points of said boiler. This is also true of the water jackets 6|] and water chambers 14. The water-jacketed horn 86 protects the wall of the main boiler-furnace into which it is fitted and as stated serves as a bridge wall and also as a means of connection between the two boilerfurnaces.

From the foregoing it will be apparent that my improved auxiliary boiler-furnace is usable with or without conventional boilers, although it may not itself have a water capacity sufficient to generate steam in large quantities. However, when utilized in conjunction with a conventional type of boiler of comparatively large size, the tremendous heat created in the auxiliary boiler or attachment so heats up the water in the water chambers, water jackets, and water spaces, that practically steam only is driven from the auxiliary boiler-furnace or attachment to the boiler in the main boiler-furnace. The products of combustion pass out of the projecting horn 85 into the fire box and combustion chamber and travel rearwardly underneath and in contact with the main boiler-furnace so as to additionally supply the water within the latter with heat, especially when these products of combustion pass through the fines of said boiler.

The construction of the auxiliary boiler-furnace or attachment is such that the unconsumed gases and soot become ignited and the products of combustion travel in contact with the waterchambers I4 and thence are directed rearwardly through a projecting horn Be in the form'of' flames, which enter the fire-box and combustion chamber of the main boiler-furnace and, after utilizing a portion of the heat in the auxiliary boiler-furnace, impinge against the underside of the boiler with substantially as much effect as though'fuel were utilized for heating in the com bustion chamber of the main boiler-furnace, especially since the'prodllcts of combustion escaping from the fire-box of a conventional boiler, constructed as shown or as otherwise commonly constructed, would contain a large percentage of unconsumed matter which would escape through the smoke-stack or chimney without transference of heat to the boiler. The auxiliary boiler-furnace shown and described is therefore smokeless and practically nothing but flame, due to complete consumption of the gases and soot, comes in contact with the heating surfaces or parts of the auxiliary boiler-furnace or attachment and the parts of the main boiler-furnace which contain water to be heated.

Present day boilers are wasteful because they do not consume all the gases and this results in the escape of the gases and smoke through the smoke-stack or chimney. Consequently, a large percentage of fuel is wasted. By using this invention in conjunction with a conventional type of boiler, the latter is converted into a smokeless boiler-furnace and the efficiency of the latter and inwardly so that when shaking the grates,

the fuel gradually moves toward the center of the furnace, as clearly shown in Fig. i. Practically only such portions of the fuel that extend inwardly beyond the lower ends of the waterchambers it become ignited and air passing-upwardly through the thin layer of fuel on the main grate assures complete combustion of the gases and soot escaping from the fuel.

Air is also supplied to the fuel through the air ducts in! and 66, and in passing through the fuel, acts to draw out gases from the burning ortions of the fuel and consume them -by converting them into flame and high heat. By taking the heated water or steam off the tops of the waterjackets $9 and water-chambers i i, and the top of the projecting horn 86 and leading such water or steam to a high point of a regular boiler and then returning water from a low point of the latter to the water-jackets, water-chambers and projecting horn, or to the chambered rear wall beneath the projecting horn, a rapid circulation of water is assured, thus generating a greater quantity of steam in the main boiler than could possibly take place if the latter were used with- When, however, the latter is shaken, the

clinkers are moved into the hottest part of the fuel and completely consumed. In the particular construction of auxiliary or supplemental boiler-furnace shown and described only a slow fire is required; therefore, clinkers are reduced to the minimum and the same heat is established as when crowding the furnace, especially if the main boiler is too small for the demands upon the same.

Having thus described my invention what I claim isi 1. In combination with a main boiler-furnace having a boiler containing water to be heated for heating the boiler, a supplemental boilerfurnace constructed to consume fuel and provide heat and having a projecting portion adapted to enter said opening in said main boiler-furnace to direct the heat created in the auxiliary boiler-furnace into contact with the boiler of the main boiler-furnace, andmeans whereby circulation of water between both boiler-furnaces is effected.

2. In combination with a main boiler-furnace having a boiler containing water to be heated and having a door-opening leading to its fire-box, an auxiliary boiler-furnace provided with means to consume fuel and with a projecting horn adapted to be entered into the door-opening of the main boiler-furnace to direct heat from the auxiliary boiler-furnace into the fire-box of the main boiler-furnace and against the boiler of the latter, and water-circulating means between said boiler-furnaces whereby increased generation of steam is assured.

3. In combination with a main boiler-furnace having a boiler containing water to be heated and space intended for the passage of the products of combustion of burning fuel within said main boiler-furnace, an auxiliary boiler-furnace adapted to be placed adjacent said main boilerfurnace and having its combustion chamber in connection with the space for the passage of the products of combustion provided in said main boiler-furnace, and water-circulating means between said boiler-furnaces whereby heated water from said auxiliary boiler-furnace is delivered to a high point of said main boiler-furnace and Water is returned to said auxiliary boiler-furnace from a low point of said main boiler-furnace.

4. The combination with a main boiler-furnace having a boiler containing water, a smokestack, a fire-box provided with a fire-grate and connection between said fire-box and said smoke-stack for the purpose of passing the products of combustion from said fire-box in contact with said boiler to said smoke-stack, of means for sealing said fire-grate to prevent the passage of air therethrough into said fire-box, and an auxiliary boiler-furnace adapted to be situated in close proximity to said main boiler-furnace and having a combustion chamber, a bridge wall between said combustion chamber and said firebox and connection with the water space of said main boiler-furnace to establish and maintain circulation of water between both boiler-furnaces.

5. The combination with a main boiler-furnace having a boiler containing water, a smoke-stack, a fire-box provided with a fire-grate, an opening in one of its walls leading to said fire-box, and connection between said fire-box and said smokestack for the purpose of passing the products of combustion from burning fuel to said smokestack and heating said boiler, of means for seal- I ing said fire-grate to prevent the passage of air and having an opening leading to space utilized therethrough into said fire-box, and an auxiliary boiler-furnace containing water and having a A projecting portion, means for consuming fuel to create heat, connection with the water space of said main boiler-furnace to cause a circulation of water between both boiler-furnaces, and a combustion chamber in connection with said fire-box through the mediumof said projecting portion.

6. In'combination with a main boiler-furnace having a boiler containing water, a smoke-stack, a fire-box, a door-opening leading to said firebox, and conduit connection between said firebox and said smoke-stack for the purpose of passing the products of combustion from said fire-box in contact with said boiler to said smokestack, an auxiliary boiler-furnace having a combustion chamber, means to consume fuel; and a projecting horn entered in said door-opening and having a passage leading from said combustion chamber to said fire-box, means for sealing said fire-box in a plane beneath said door-opening so that the draft created through the smokestack and said connection and fire-box is effective only on said combustion chamber and the passage in said projecting horn leading from the latter to said fire-box, and means whereby circulation of water between both boiler-furnaces is effected.

7. In combination with a main boiler-furnace having a boiler containing water to be heated and space intended for the passage of the products of combustion of burning fuel within said main boiler-furnace, an auxiliary boiler-furnace adapted to be placed adjacent said main boilerfurnace and having a water-space containing water to be heated, a combustion chamber in connection with said space within said main boiler-furnace, a pipe connecting a high point of said water space with a high point of said boiler, and a pipe connecting a low point of said water space with a low point of said boiler.

8. In combination with a main boiler-furnace having a boiler containing water to be heated and space intended for the passage of the products of combustion of burning fuel within said main boiler-furnace, an auxiliary boiler-furnace adapted to be placed adjacent said main boilerfurnace and having water-containing elements at opposite sides thereof to be heated, a combustion chamber in connection with the space within said main boiler-furnace, pipes connecting high points of said water-containing elements with a high point of said boiler to convey heated water and steam from said water-containing elements to said boiler, and pipes leading from low points of said water-containing elements to a low point of said boiler through which water is returned from the boiler to said water-containing elements.

9. In combination with a main boiler-furnace having a boiler containing water to be heated and space intended for the passage of the products of combustion of burning fuel within said main boiler-furnace, an auxiliary boiler-furnace adapted to be placed adjacent said main boilerfurnace and having a fire-grate centrally therein, downwardly-and-inwardly inclined waterc-hambers separated by space utilized as a combustion chamber, fuel-chambers outside of said water-chambers directing fuel to said fire-grate, auxiliary grates serving as bottoms for said fuelchambers, and means for moving said auxiliary grates to shake fuel from said fuel-chambers onto said fire-grate, pipes connecting high points of said water-chambers with a high point of said boiler, and pipes connecting low points .of said water-chambers with a low point of said boiler. 1 0. In combination with a main boiler-furnace having a boiler containing waterto be heated and space intended for the passage of the products of combustion of burning fuel within said main boiler-furnace, an auxiliary boiler-furnace adapted to be placed adjacent said main boilerfurnace and provided with means for consuming fuel, water chambers spaced apart, a combustion-chamber between said water chambers for the products of combustion from said fuel, a horn extending from, said auxiliary boiler-furmace and having a passage lea-ding from said combustion-chamber to said space within the main boiler-furnace, said horn having a waterchamber surrounding it, pipes leadingfrom high points of said water-chambers to a high point of said boiler, and a'pipe leading from a low point of said boiler to low points of said water-chambers.

11. A boiler-furnace, comprising a housing having side walls, a front wall, a rear Wall, and a top wall, water-jackets forming the upper portions of said side wall, said rear wall being provided with a water-space at its upper portion and a rearwardly projecting horn having waterspace surrounding it and in communication with the water-space of said rear wall, water-chambers between said side walls and extending downwardly and inwardly from saidtop wall, said water-chambers being spaced from each other to form a combustion chamber therebetween and being also spaced from said water-jackets to form downwardly and inwardly inclined fuel chambers, a main fire-grate beneath said combustion chamber, pivotally mounted auxiliary grates serving'as the bottoms of said fuel chambers and having horizontal inner portions and upwardly and outwardly inclined outer portions serving in conjunc-tion'with said water-jackets as the outer walls of said fuel chambers; the lower endsof said water-chambers being spaced from said main grate and from the lower or inner ends of said auxiliary grates, means for shaking said auxiliary grates, a hot water pipe connected to a high point of the water-space in said rear wall,

a cold water pipe connected to a low point of said last-mentioned water-space, a hot water pipe connected to a high point of each of said Waterjackets, a cold water pipe connected to a low point of each of said water-jackets, a hot water pipe connected to high points of said waterchambers, ,anda cold water pipe connected to a low pointof each of said water-chambers.

12. A boiler-furnace, comprising a housing having a front wall, side walls, a rear wall, and a top Wall, a main fire-grate centrally between said side-walls, auxiliary grates at each side of said main grate, water-jackets serving as upper portions of said side walls and inclined inwardly and downwardly, said auxiliary grates having upwardly and outwardly inclined portions, the outer terminals of which are pivotally secured and are disposed adjacent the lower ends of said water-jackets to form lower walls for fuel chambers leading fuel to said main fire-grate, each water-jacket having a plurality of air tubes therein, means applied to said water-jackets to close said air tubes or open the same to any extent desired, downwardly-and-inwardly inclined elements extending from said top wall in spaced relation to said water-jackets and serving as the inner walls of said fuel chambers, air tubes in the upper ortions of said side walls opening into spaces directly beneathsaid auxiliary grates, and means to close said air tubes or open the same to any extent desired, a hot water pipe leading from a high point of each said water-jackets, and acold water pipe leading from a low point of each of said water-jackets. 1

13. A boiler-furnace adapted for use in connection with a conventional boiler-furnace having a fire-box, comprising a combustion chamber, a fire-box for use as a substitute for the fire-box of aconventional furnace, a water space serving as the confines for said combustion chamber, a horn projecting from its rear end and waterjacketed with the water space therein in communication with said first-mentioned water space, said horn being adapted to have its outer endentered into or through an opening leading to the combustion chamber of the conventional boiler-furnace, and circulation water pipes designed for connection with the water space of the conventional boiler-furnace.

JOHN COOK.

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