US1758790A - Gas-burning device - Google Patents

Description

May 13, 1930.

J.P.Fl SHERE-'I'AL GA'S BURNING DEVICE Original Filed Jan. 10, 1924 KJIUUL JUL Patented Ma.y 13, 1930 um rso STATES; PATENT- OFFICE JAMES P. FISHER, or nanrbnsvnnn, 'oxLAnoma, BENJAMIN ennmwmw, or

- burner is that the gas and-air JACKSON smears, new YORK,

ASSIGNORS TO DOHEBTY BESEARCH COMPANY,

TION OF DELAWARE AND NOBLE u. nu'rcnmson,

or on. HILL, KANSAS, or new. YORK, n. Y., a comma- GAS-BURNING nnvren Original application filed January 10,1924, Serial No. 685,819. Divided 'and this application fled.

September 11, 1928.

This application is a division ofour coo. 685,319, and the invention herein disclosed relates to improvements in gas burning devices.

function efiiciently at relatively low sure and which will produce a soft rolling flame under normal conditions of operation. One of the prime requisites of an efficient gas be intimately mixed in correct proportions for complete combustion,a requisite that has not been easy of attainment with gas at low pressure. The apparatus of the present invention, however, enables a proper air-gas mixture to be obtained with gas at low pressure and additionally gives a soft rolling flame which completely fills the firebox as contrasted with the blast-like flame of poorly designed burners which if allowed to impinge on the inside of the firebox will cause buckling of the walls, loosening of the stay bolts, and other boiler troubles.

i The burner arrangement according to the present invention comprises a relatively large number of gas nozzles or jets above each 0 which is a short mixing tube. The flow of gas produces an aspirating action which draws primary air into the mixing tubes where the air and gas are formed into a combustile mixture. Secondary air for complete combustion is drawn into the combustion space above the mixing tubes by way of openings between the mixing tubes.

For a more complete understanding of the invention reference is made tothe following detail description in connection with the accompanying drawing wherein the'preferred form of the invention is shown.

Referring to the drawing,

Fig. 1 is a plan view of the improved burner construction showing the burner as arranged within a boiler firebox which latteris shown in horizontal cross section, and also showing an air box or conduit through which air passes on its way to the burner.

Fig. 2 is a vertical section on line 2-2 of Fig. 1 showing among other things the rela- One of the objects of the inven tion is to provide a gas burner which willv gas pres Serial No.- 184,806.

tive relation between the mixing tubes and gas nozzles. y

Fig. 3 is a plan view of one of the castings which go to make up the mixing tube set.

Fig. 4 is aside elevation of-the casting 5 shown in Fig. 3.

The improved burner is positioned in any suitable manner at the bottom opening of a boilerfirebox generally indicated at 10 or in the manner hereinafter more fully described. The mixing tubes forming part of the burner are generally indicated at 12 and the as nozzles at 14, the latter being positioned elow the former and in axial alinement therewith. The mixing tubes 12'are preferably arranged in parallel rows there being provided betwen adjacent rows a slot or opening 16 through which secondary air for combustion may enter the combustion space above the mixing tubes as will presently more fully :0

ap ear.

ach row of mixin tubes is preferably formed as part of a cast ar or plate 18 having end lugs as at 20 for securing the casting to a frame 22 which is positioned within the bottom opening of the boiler firebox in any suitf able manner. The castings,18 are arranged side by side in spaced relation, the spaces etween the casting constituting the slots or openings 16 for secondary air as previously 30 mentioned. Figs. 3 and 4 show theactual details of constructionsof the mixing tube castings 18.

The gas nozzles 14 extend from a header 24 which is supplied with gas by a pipe 25. The tips of the gas nozzles are ositionedsomewhat below the bottom openings of the mixing tubes 12 which latter are of relatively large diameter and of short length. A pilot burner 26 is positioned at any suitable point the gas pipe therefor being arranged in any suitable manner or as indicated at 28.

The air for combustion purposes flows to the burner through a flue or air duct generally indicated at 30. This flueopens onto the botwith the maximum amount of gas. Damper 34 on the other hand is operated to regulate the air supply in accordance with variations in gas feed in a manner disclosed in the copending application above referred to.

The frame 22 within which the mixing tubes are located is preferably surrounded by a refractory member 36 to protect that edge of the frame which is exposed to the heat of the burner. Fire-clay or the like 38 may be inserted between the sides of the firebox opening and the refractory member 36 and frame 22 to make an air tight joint therebetween.

As previously indicated, the gas issuing from the gas nozzles 14 is directed into the center of the mixing tubes and draws air into the tubes to form a combustible mixture, which issues from the upper ends or discharge ports of tubes 12. Secondary air is induced to flow through the passages or ports 16 between the rows of mlxing tubes and into the combustion space above the mixing tubes to complete combustion, the air flow for the burner being regulated b dampers placed in the air flue through which air flows to the burner. lhe amount of secondary air flowing into the combustion space is of course determined by the size of the openings or slots between the mixing nozzle rows. It has been found that when the area of the secondary air passages is less than the cross-sectional area of the mixing nozzles, the best results are obtained. A burner constructed and arranged as specified enables gas at low pressures to be properly mixed with air for combustion purposes and enables a soft rolling flame to be obtained within the firebox.

Although the burner of this invention has been illustrated and described as applied to a steam boiler, it is to be understood that it is applicable with equal facility to a hot-water, hot air or other furnace or heating device.

What is claimed is:

1. In a gas burner, the combination of a plurality of uniformly shaped narrow bars each having a plurality of holes formed therein constituting open ended primary air-gas mixing tubes extending therethrough, said bus being arranged in spaced parallel relation to form relatively narrow passages therebetween for the passage of secondary air from adjacent the inlet to the outlet ends of said tubes, and gas jet members' spaced from the bars and co-axial with the holes therein for directing'the' gas and inducing primary air into said tubes.v v

2. A burner unit for gas heating apparatus comprising a gasburner having a plurality of spaced orifices in, its combustion face, each of said orifices comprising an outlet from a primary air-gas mixing device, secondary air passages formed in the burner having an outlet located in the combustion face of the burner closely adjacent to each of the air-gas orifices, and a damper controlled duct arranged to supply air to said mixing damper controlled duct-arranged to supply airat a controlled rate to said mixing tubes and air passages.

4. A burner unit for gas-heating apparatus comprising a multi-apertured gas burner adapted for setting in a furnace fire-box opening, some but not all of the burner apertures being arranged for the delivery of a primary air-gas mixture to the combustion face of the burner, an air supply duct open at its inlet end to the outer air, said burner forming a perforate closure for the outlet end of the duct, and means for supplying gaseous fuel to the air-gas apertures, the remainder of said burner apertures being arranged for delivery of secondary air from said air duct to the burner face adjacent each of the air-gas apertures.

5. A burner unit for gas heating apparatus comprising a gas burner formed with a plurality of closely spaced air-gas delivery ports and air discharge openings in its combustion face, an air supply duct, said burner forming a perforate closure for the outlet end of said duct, a gas and air mixing'device communicating with each of same air-gas ports, passages in the'burner connecting said air duct and said discharge openings, and a damper arranged to control the supply of air to said discharge openings and to said mixing device.

d. In a gas burner, in combination, a plurality of gas-air mixing tubes, said tubes being spaced to provide secondai air passages therebetween, a gas jet space from and axially centered in the inlet end of each mixing tube, said tubes and passages terminating respectively in closely spaced fiame'ports and airdischarge openings in the combustion face of the burner, and a damper controlled duct "arranged to" supplyair to the inlet ends of signatures.

' JAMES P. FISHER.

BENJAMIN GREENFIELD. NOBLE M. HUTCHINSON.

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