US782472A - Furnace. - Google Patents

Description

No. 782,472.. A g PATENTED FEB. A14:,A 1905!` E. W. TUCKER & G. L. GRUNDBLL.

FURNAGB. APPLICATION FILED MA1/2.30. 1903. RENBWED JUNE 20,1904.

Patented February 14, 1905.

PATENT OFFICE..

EDWIN W. TUCKER AND CHARLES L. GRUNDELL, OF SAN FRANCISCO, CALIFORNIA.

FURNACE.

SPECIFICATION forming' part of Letters Patent No. 782,472, dated February 14, 1905. Application led March 30, 1903. Renewed June 20, 1904,. Serial No. 213,413.

To ad whom, it may concern:

Be itknown that we, EDWIN W. TUCKER, residing at 818 Page street, and CHARLES L. GRUNDELL, residing at 1638 Hyde street, in the city of San Francisco, county of San Francisco, and State of California, citizens of the useful Improvements in Furnaces;

hcrebydeclare the following to be a full, clear,

and exact description of said invention, such as will enable others skilled in the art to whichl it most nearly appertains to make, use, and practice the same.

This invention relates to improvements in furnaces, and particularly to the adaptation of the furnaces of Water-tube and all externally-fired boilers -to the use of liquid fuel.

Because of the circulation of water around and about the furnaces of most water-tube boilers the furnace heat is rapidly absorbed,

. rendering the boiler very sensitive to thermal iiuctuations. The principal source of trouble tion and reaction of heat with anl intensity capable in a measure of withstanding the cold drafts, whereas injected oil, giving a sublimated fiame of high velocity and suction, must be protected against inrushes of cold walls and surface of the furnace and mixing with the flame reduce the absorbent power of the former and weaken the latter.

The objects of this invention are to overcome the objections above set forth by controlling the inlet of cold air and warming it before admission to the combustion-chamber and to accomplish heating of the air by refraction of heat within the combustion-chamber.

In carrying out our invention We provide hollow superheating-chambers fixed Within the front of the furnace in place of the usual Va solid flooring of rushing into the furnace-space` thereto.

Stoke-doors and extend.

through .which the burners The usual grate-bars are replaced by lire-brick having a narrow opening constituting the dead-rise across the front under the burners. Dampers are arranged whereby the inlet of air through the dead-rise is controlled from the outside. A defiecting-diaphragm is disposed across the width of the furnace between the lioor of the combustion-chamber and the floor. of the ashpit. The inlet of air through the lower dam- 'per-opening is controlled by la door horizontally hinged at its bottom, whereby the ingress of air is directed against the deliectingdiaphragm when the door is partially open. When the said door is wide open, the draft is controlled 'by a series of horizontally-pivoted slats or defiectors operated in unison, wherebythe current of air may be deflected at any desired angle. In internally fired boilers (marine type) the deflectors can be fixed in the opening at a definite angle.

In the drawings, Figure l is a vertical crosssection on the line X X, Fig. 2, of a watertube boiler having this invention adapted Fig. 2 is a front elevation of furnace-fronts thereof.

In detail the construction consists ofthe hollow superheaters A, around and through which the vehicle of atomization' (compressed passing to the burners B. The superheaters A, situated in the front of the furnace, absorb the heat radiating therefrom and return it through the flame issuing from the burners. The combustiou-chamber is formed by the shell or tubes of the boiler (according to the type) above, bridge-wall rc at the rear, the usual brick or tubular sides x2, the superheatingfronts A, and the Hoor. The fioor consists of the sheet-iron base C, suitably supported and having a layer of fire-brick C laid thereon, with a thickness of asbestos millboard C2 between to protect the iron from the intense heat of the combustion-chamber. The airthe floor near the furnace-fron t. the dead-rise is controlled by the 1 2 Y 5 1ated at D to receive a pin engaging the 1 0 the demand of the stack-suction.

f' `gof this invention. Therefore the space'below l5 This is accomplished by closing the rear of 2O above the damper-door downward to near the ter, consisting of a series of horizontal deor close in unison with the action of the rod quadrant F5.

the current of air curls around the air passes directly into the flame of the air are eliminated and a certain amount of re- 'the boiler-surface as it passes.

the shutters F. It will also be observed that the angle at which the air enters is controlled by the shutters independent of the angle of the doors G.

The type of superheater furnace-front and also the type of burners constitute separate applications for patent and are not herein claimed.

It is obvious that this invention relates to other types of boilers, and applicants do not wish to be confined to the exact type illustrated in its interpretation.

Having thus described this invention, what is claimed, and desired to secure by Letters Patent, is-

1. lIn combination with a steam-generating boiler, a furnace adapted to the use of fueloil, having hollow superheating chambers through which the vehicle of atomization circulates before admission to the burners, a solid iioor having a draft-opening at its front, dampers arranged to control the volume of air passing through said opening, a closed air-space being formed beneath' said floor, a diaphragm dividing said space horizontally, openings being formed in the front below said diaphragm, hinged doors arranged to regulate the volume of air entering said opening, and a series of shutters or defiectors arranged in said openings and adapted to regulate the angle at which the air enters.

2. In combination with a steam-generating boiler, a furnace adapted to the use of fueloil having a solid floor provided with draftopenings across its front, dampers arranged to close said openings, means for adjusting said dampers with relation to said openings and holding them in their adjusted position, a closed air-space being formed beneath said floor, a diaphragm dividing said space horizontally, openings beingalso formed in the front below said diaphragm, hinged doors arranged to regulate the volume of air entering said openings, and a series of shutters or deectors mounted in said opening and adapted to regulate the angle at which the air enters, and means for holding said shutters or deiiectors in any adjusted position. l

3. Afm-nace adapted to the use of fuel-oil having a draft-opening, a swinging door adapted to regulate the volume of air entering said opening, a series of shutters or deiiectors mounted in said opening and adjustable to regulate the angle at which the air enters said opening, and means for holding said shutters or deflectors in any adjusted position.

In testimony whereof we have hereunto set our hands this 23d day of March, 1903.

EDWIN W. TUCKER. CHARLES L. GRUNDELL. Witnesses:

BALDWIN VALE, Gno. F. HA'rToN.

pivoted adjacent to the edge of the opening and controlled by the handle D, projecting through the face-plate of the furnace.- To control the said damper, the handle is perfoquadrant D3, provided with perforationsinto which the pin may be inserted to fix the damper at the desired angle. As described, the dead-rise is the only inlet for air to supply To admit cold air at this point would defeat the objects the oor of the combustionchamber 1s utilized as a heating zone for the incoming draft.

this space with the vertical wall E under the bridge wall. The heating chamber thus formed is divided horizontally by the sheetiron diaphram E', extending from the front.

center and terminating short of the rear wall E to leave a rise for the draft.

The volume of incoming air is controlled and directed by the doors G and divided shutflectors or shutters pivoted at each end on the sides of the damper-opening. The shutters F are connected by thevertical rod F in such a manner that the shutters are caused to open which is controlled by the lever F2, hinged at F3 and fulcrumed to the rod at Ff. rlhe position of the lever F2 is fixed by apin extending through the same and the perforated The incoming air receives its preliminary heating by being directed by the shutters F and doors G against the diaphragm E', which is heated by the heat radiated beneath the floor C. Following the diaphragm the lower end into the intense heat existing between the oor C and the diaphragm and enters the combustion-chamber through the opening C3 at ahigh temperature. From the opening C burners, mixing therewith, to be carried forward and distributed lto the heating-surface of the boiler. By thus making a pocket of the combustionchamber disturbing-currents of generative action created thereby, whereas where open grate-bars and direct ventilation exists the excess of cold air, which is beyond control, rushes up the smoke-stack, chilling By this ar-v rangement of dampers a reserve of hot air can be bankedin the space below the oor C by opening the shutters F and doors G and restricting the openings C3 by the dampers It will be noted that when the doors G are partly open they serve to direct the air against the diaphragm; but when said doors are open to their fullest extent the -air is deflected by IOO IOS

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