US1366779A - Means for feeding fuel to furnaces - Google Patents

Description

A. G. FUX. MEANS FOR FEEDING FUEL TO-FURNACES.

APPLICATION FILED JULY 26, I917.

Patented 25, 1921,

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UNITED STATES PATENT oFFIcE.

ALFRED GEORGE FOX, OF NEW CROSS, ENGLAND.

MEANS FOR FEEDING FUEL TO FURNACES.

Application filed July 2 Relating .to Means for Feeding Fuel to Furnaces, of which the following is a specification.

This invention relates to means for feeding fuel to furnaces of the type in which the fuel is fed from the front to the rear of the grate by the movement of the grate itself. These grates are usually'supplied with fuel by gravity through a conical hopper and the thickness of the layer of fuel passing on to the grate is regulated by means of a guillotine type of door which is adjustable in a vertical direction. In order to consume fuel efficiently it is essential that the whole of the grate area from the front to the (lumping bars be kept uniformly covered and we have found that with many classes of fuel the rate of burning at different areas across the grate varies considerably, owing probably to variations in the draft, or in the brick-work radiation or to other causes. The result of this is that although a uniform layer of fuel may be led on to the grate through the guillotine door, combustion at some points is completed much sooner than at other points so that before the grate reaches the dumping bars some parts of it may be bare of fuel while atother points the fuel is incompletely burned and falls into the ash hopper in this state. We have also found that both the rate of combustion and the areas over which the varying combustion takes place may vary considerably with differentclasses of fuel. Whatever thecause of the varying rate of combustion, it is Very ruulesirable, as the efficiency of the boiler may be lowered very considerably thereby.

fine object of this invention is to overcome this objection and to this end it com sists in providing a door, the lower or strickling portion of which is divided into a number of easily, relatively adjustable sections so that by raising and lowering these sections the thickness of the layer of fuel led on to the grate may be varied at different points. l

In carrying this invention into effect according to one modification, we provlde in front of the furnace across girder from which all the sections of the door with their Specification of Letters Patent.

cal furnace front or lintel.

Patented Jan. 25, 1921.

1917. Serial No. 182,865.

adjusting apparatus are suppoited. The ad usting mechanism may consist of a screw and nut, rack and pinion or any other suitable device The cross girder may also be provlded with adjusting means so that the whole of the sections may be adjusted simultaneously before or after being adjusted individually. The individual sections of the door may be of any suitable shape but We prefer to make them substantially rectangular and hollow for a portion of their length, the interior space being filled with some heat insulating material so as to prevent radiation from the furnace through the door to the unburned fuel in the hopper. It.

is also desirable to provide the lower ends witheasily renewable points so that should the lower ends become burned or otherwise destroyed they can be renewed. This is a great advantage over the bresent guillotine type of door as in case of burning the whole door has often to be rebuilt and renewed whereas with the present invention only the sections which are damaged require to be renewed'or fitted with new end pieces, which can readily be done without putting the boiler out of action.

The existing types of-door usually consist of brick inclosed in a metal framing, and the inside face, which is next to the fire, travels up and down in proximity to the fixed verti- As in everyday use considerable distortion, and displacement of bricks usually takes place in the furnace door, the necessary clearance between these faces to prevent jamming is often such that considerable air leakage takes place into the furnace,the result often seriously lowering the temperature of the combustion arch.

A further object of our invention is to construct a sectionalized door so that it overcomes this disadvantage also, and consists in providing the upper part of the door with lean-to sections which normally make rubbing contact with the vertical furnace front or lintel. These sections may be separate and independent of the sections which control the thickness of the layer of fuel and supported from the cross girder or they may be integral therewith; in either case, for the purpose of sealing, the sections may be provided with substantially horizontal projections or noses which are held by gravity against the lintel.

As the sections are independent of each through contact with the burnin other each of these projections will make rubbing contact with the lintel plate so that an effective air seal isobtained. The accompanying drawings will serve to illustrate our invention, .igure 1 being a front elevation partly in section of a furnace door Fig. 2 a sectional side elevation on line 2- 2, of Fig. 1.

in the drawings, a represents a cross girder forming part of the frame of the door adapted to be raised and lowered by any suitable mechanism, as pulleys 1, cable 2, and counterweight 8. The door consists of a number of separate sections Z) which are secured to the cross girder a by means of bolts 0 which pass through bosses formed on the girder and are provided with nuts 0 at their upper ends so arranged that as the nuts are rotated the section to which its bolt is attached will be raised or lowered Thi allows or" the thickness of the layer of fuel admitted under any section being regulated to the desired thickness and after each of the sections has been adjusted the thickness of the layer passing on to the grate under all the sections can be varied simultaneously by the same amount by raising or lowering the cross girder through suitablemechanisni,

such as the pulley and weight arrangement shown in 1. The individual sectionsoi": the door each consists ota main portion of substantially rectangular shape the interior of which is filled. with some heat resisting material to prevent radiation from the fun nace through the door to the unburned fuel in the hopper 9. As the lower ends of gui lotine doors are subjected to eat he coal t. rapidly become burned or otherwise ('1. stroyed in places and one of the main advantages of making the door in sections is that one or more sections can be removed and renewedwithout having to replace the whole door. To still further improve the construction we provide each section with renewable nose-piece 7t clamped to the lower end'by means of a c bolt l: and containing heat insulating material such lire brick m which may be held in place by means of dowel pins a cast on'the main portion 6 of the section. arranged that the fire brick is not only firmly clamped the lower end of the main portion, but the bolt 1: being located on the outside of the furnace door it is .tully protected from the deleterious action of the heat from the furnace. The sections pivoted. to their adjusting bolts by pivots or pins 5 which'lie in avertical plane passing oetween the lintel and the center of gravity of every section. The projecting heads 0 of the The bolt 7': is so meagre jections 0 on the individual sections will accommodate themselves to the lintel and continue to be held in close contact with it and prevent alr from leaking into the furnace.

fit the same time amming or stilt working of the door is avoided.

Guides extending from the cross girder are provided for each section as indicated at 6, Fig. 1 to prevent any undue move ment.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. The combination with a'furnace of a door therefor composed of a number of separate sections, a girder from Which'said sections are supported, means for adjusting each section independently with respect to the girder and means for adjusting the girder with respect to the furnace.

2. In combination, a furnace, a plate or lintel forming part of the frame thereof, a

door comprising a girder and a plurality of separate sections, pivot means fastening each of said sections to said girder, each of said pivot means lying in a-ve'rtical plane between the lintel and the center of gravity of its section, the sections bein individually held by gravity in contact wit 1 the lintel to form a seal therewith.

The combination with a furnace of a door therefor comprising a number of sepa- 1" .e individually adjustable sections, a

.girder from which'said sections are suspended, a projection secured to the rear side oi": each of the sections, a plate or lintel forming part of the framework of the fur.

nace, pivot means securing each of the sections to the girder, each of said pivot means lyingin a vertical plane between the lintel and the center of grat ity of its section, said projections being held by gravity in contact with the lintel to form a seal therewith.

l. In combination, a furnace, a fuel feeding device therefor, a door adjustable as whole to regulate the feed thereof, comprising a' cross girder and a plurality of separate sections supported by saidgirder, said girder having guides for said sections, and means carried by the girder for adjusting the sections independently.

In witness whereof, I have hereunto set my hand this 6th day of July 1917.

ALFRED ononon FOX.

Witnesses J OHN GRAY, CHARLES H. Bonenss.

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