US2499814A - Combustion gas recirculating steam and air injector means for furnaces - Google Patents

Description

March 7, 1950 J R BUTLER R 2,499,814

COMBUSTION GAS RECIRCULATING STEAM AND AIR INJECTOR MEANS FOR FURNACES Filed May 23, 19.45

JNWWWM MV Patented Mar. 7, 1950 COMBUSTION GAS RECIRCULATING STEAM AND AIR INJECTOR MEANS FOR FUR- NACES Joseph R. Butler, Chicago, 111.

Application May 23, 1945, Serial No. 595,311

2 Claims.

My invention relates to smokeless combustion of fuel in furnaces in connection with steam boilers. It has for its object the means for breaking up stratification of combustion gases by induced recirculation of these gases through a conduit or conduits located in furnace walls and the reintroduction of these gases without further dilution with excess air at a point where the temperature of the incandescent fuel bed will insure their proper combination for efficient combustion.

Also it provides the means for metering the amount of air over fire where the hydrocarbons are being distilled off rapidly such as when green coal is being added to fuel bed.

My invention relates to the provision of an injection device for injecting a circulating medium, or media, such as high velocity steam or air, or both, or a varied mixture and velocity, into the furnace to circulate or re-circulate lean or rich gases, etc.

Another advantage of my invention resides in the provision of metering means for controlling said injection device.

Another advantage, among others, is the provision of such a device in such a manner as to provide simple access for inspection and repair, and at relatively low cost of manufacture.

Further advantages and objects of my invention will appear and be brought out more fully in the accompanying drawings, in which:

Fig. 1 is a vertical sectional view of a standard boiler furnace showing my invention applied thereto.

Fig. 2 is a detailed sectional view on the line 22 in Fig. 1.

Fig. 3 is a detailed sectional view on the line 3-3 of Fig. 1.

Fig. 4 is a detailed sectional view on the line 4-4 of Fig. 1.

Referring to the drawings, I have shown a furnace for a standard steam boiler [0, having grate H, and a front fuel door l2.

Also provided is an ash pit I3 in the front wall 14.

Also shown is the fire brick wall [5, in which are mounted the water tubes 16.

I have also shown a smoke chamber ll leading to the chimney.

In the front wall I have provided an anchor plate 18, secured to the wall by bolts [9, or other suitable means.

The anchor plate I8 is adapted to secure in a bore |8a in the front wall 14, a gas circulating device, 20.

The gas circulating or re-circulating device 20 in the form shown has a steam injection pipe 2|, clearly illustrated in Fig. 2, located in an airsupply tube 22.

The circulating device 20 is also provided with an interior metering inlet opening 23 in the airsupply tube 22.

Also provided in the air-supply tube 22 is an exterior metering inlet valve 24.

The afore-mentioned pipe 2i and supply tube 22 are mounted in a casing 25, mounted in tm'n in the bore [8a of the furnace.

Also provided is a metering gage 26 and a handle 21; and, in addition, a steam surface valve 28, admitting steam to the steam injection pipe 2|.

Mounted in refractory blocks 29 is a duct 30 leading into the furnace to permit injection of the steam and air.

There are also provided circulating ducts 3| leading to the metering opening 23.

It is believed that the operation will be manifest without detailed description, but, in short, such a device may be mounted in a standard furnace, and air or steam may be admitted into the fur--' nace, and may be metered to suit.

When the steam is injected into the furnace, rich or lean gases may be drawn into the ducts 3 I and through the opening 23 to be again injected into the furnace and be circulated and re-circulated over and over as desired.

By this means the stratification of combustion gases will be broken up and insure substantially efiicient and smokeless combustion.

It will be manifest also that by the means provided, the amount of air over a fire where the hydrocarbons are being distilled off rapidly, such as when green coal is being added to the fuel, may be metered.

Also, by the means that I have provided, there is easy access for inspection and repair.

The air-supply tube 22 and the casing 25 may be provided with cut-outs 32 and 33 respectively, which may amount to as much as of the circumference of the tube or casing.

Around these cut-outs, a space 35 may be formed by removing some of the tile or brick.

This may be filled with acoustical packing such as asbestos or spun glass, or other suitable material 36, for reducing or eliminating any undesirable sound, if such should be found to exist.

In order to keep the packing in place there may be provided a cage 37 of lathing, or other suitable material, about the casing 25.

It will be apparent that the circulating device may be placed at practically anywhere in the furnace.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variation and modifications as come within the scope of the appended claims.

Having thus described my invention, whatI claim as new and desire to secure by Letters Patent is:

1. In a furnace having walls and a fire box, the combination, which comprises an injector positioned in a wall of the furnace and directed'toward the combustion area of the fire box, a housing for said injector having air inlet means positionedon the outside of the furnace wall, adjustable closures for said air inlet means, said housing also having openings positioned-within the furnace wall communicating with the interior of the furnace and adapted for drawing hot gases of the fire into said injector for reinjection into the furnace, adjustable closures for the reinjection openings, a single manually operable means adjusting the adjustable closures of the reinjection openings and also the openings of the air inlet means from the exterior of the furnace, and sound vibration absorbing meansencircling a portion of the injector and within said wall and combustion area of the fire box.

2. In a furnace'having walls and a fire box, in combination, an injector assembly arranged in a Wall of the furnace and operably communicating with the combustion area of the-said fire 4 box, said injector including a housing, a steam injecting pipe located within the housing, an air supply pipe concentric with the steam injecting pipe, valve means arranged exteriorly of the combustion chamber and efiective to admit air into the said air supply pipe, other valve means for admitting products of combustion from the combustion chamber into the pipe, and sound deadening means encircling and concentric with a portion of the injector assembly, said sound deadening means being located within a portion of the. said furnace wall,

JOSEPH R. BUTLER.

REFERENCES CITED Thefollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 400,709 Piggott Apr. 2, 1889 479,771 Walters July 26, 1892 609,225 Briney Aug. 16, 1898 618,011 Macy Jan. 17, 1899 747,007 Smith Dec. 15, 1903 783,998 Doyle Feb. 28, 1905 906,967 Triggs Dec. 15, 1908 1,066,041 Parsons July 1, 1913 1,310,173 Callery July 15, 1919 1,671,448 Plassmann May 29, 1928 1,729,763 De Florez. Oct. 1, 1929 1,766,534 Prat June 24, 1930 1,860,366 Lucke May 31, 1932 FOREIGN PATENTS Number Country Date 17,302 Great Britain July 9, 1902

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