US1135842A - Smoke-consuming furnace. - Google Patents

Description

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H. L. PRICE & G. L CARTWRIGHT.

SMOKE CONSUMING FURNACE.

APPLICATION FILED 05011, 1913.

Patented Apr. 13, 1915.

2 SHEETS-SHEET 1.

H. L.'PR|CE & G. J. CARTWRIGHT. SMOKE CONSUMING FURNACE. APELICATION FILED DEC. 1|. I913.

Patented Apn 13, 1915.

2 SHEETSSHEET 2.

INF. NORRIS PETERS CO ,PHOTD LITHO WASHINGTON, D C

nnrrnn s rarns rarnnr @FFTQFL HARRY LOWELL PRICE AND GEQRGE JOSEPH CARTVVRIGHT, OF SYDNEY, NEVT SOUTH WALES, AUSTRALIA.

SMOKE-CONSUMING FURNACE.

aisaaaa Application filed. December 11, 1913.

To all whom it may concern Be it known that we, HARRY LOWELL Pinon and Gnonen Josnrn CARTWRIGHT, citizens of the Commonwealth of Australia, residing at Sydney, New South Wales, Australia, have invented a new and useful Smoke-Consuming Furnace, of which the following is a specification.

This invention relates to improvements in the means employed for perfecting the combustion of fuel in boiler and other furnaces, and for preventing the emission of smoke from said furnaces, by means of perforated air admission pipes and passages adapted to be regulated exteriorly to the furnace, the said pipes and passages being suitably proportioned to the grate area of the furnace, and by means of other air admission pipes provided with regulator valves located exteriorly to the furnace but communicating with an air passage formed in the bridge and having vents open to the combustion chamber, and, further, by the use of a flame tube having its inlet in the furnace and its outlet in the form of a perforated ignition tube arranged Within the combustion chamber relatively near to the air vents formed in the bridge and communicating with the combustion chamber. The said vents, communicating both with the air admission passages and the perforations in the ignition tube, are graduated in dimension from small to the largest, in the terminal direction of the pipe or passage with which they are associated. The aggregate area of these vents or perforations will in all cases bear the same proportion as the pipes or passages with which they are associated. The piercings of the air regulator valves are likewise proportioned relatively to the area of the pipes with which they are associated. By means of these regulator valves a careful adjustment of the air supply may be obtained. That admitted over the furnace front, while insuring the satisfactory combustion of fuel, also tends to keep the furnace door cool, and that admitted through the bridge to the combustion chamber, passing both over the bridge from the furnace and through the flame tube to the ignition tube, insures a commingling of heated air with the resultant gases, thereby preventing the accumulation of smoke.

Specification of Letters ?atent.

Patented Apr. 13, 1915..

Serial No. 805,959.

The invention is applicable to the many and varied forms of furnaces, such as the Babcock & VVilcoX type of boiler, and other forms of multitubular, locomotive, Cornish, Colonial, and jackass type of boiler furnaces, and may be cheaply applied thereto without the necessity for extensive alterations.

Referring to the accompanying drawings: Figure 1 is a central vertical sectional elevation of a Babcock & Wilcox type of boiler, showing application of the invention thereto. Fig. 2 is a vertical sectional elevation on line aa of Fig. 1, showing air regulating pipe and vents over furnace door. Fig. 3 is a horizontal sectional plan on line b?) of Fig. 1, showing general arrangement of air regulated admission pipes, passages, vents, and flame and ignition tubes. Fig. 4: is a plan of the flame and ignition tubes as in Fig. 3, showing detail of construction. Fig. 5 is a central vertical sectional elevation of air regulator valve as used with air pipe over furnace door and air pipe in bridge. Fig. 6 is an end elevation of air regulator valve. Fig. 7 is a sectional elevation on line 00 of Fig. 1, enlarged, looking toward furnace door, and ash pit door, showing air regulating pipe with vents above furnace door. elevation on line cZcZ of Fig. 1, enlarged, showing vents in furnace bridge and flame and ignition tubes, with air regulator passage shown dotted. Fig. 9 is a side elevation of part of Fig. 1, enlarged, showing air regulator valves for admitting air above the furnace door and into bridge, also arrangement of connections from flame pipe in furnace to ignition tube in combustion chamber.

The aforesaid figures of the drawing illustrate the application of the invention to a Babcock & Wilcox type of boiler, in which the heat generated in the furnace A is caused to pass through the first nest of tubes and over the director plate B through the second nest of tubes, its downward direction being controlled by the baffle plate G and director plate D, entering the combustion chamber E and passing upward through the third nest of tubes and downward to the outlet flue F, as indicated by the arrows (Fig. 1), a form of construction involving a more tortuous travel of the heat than in other types of Fig. 8 is a sectional boilers where the heat simply passes over the bridge and quickly enters the combustion chamber.

In the brickwork above the furnace door frame G, a tubular passage H is provided, having the air regulator valve I externally connected thereto, and perforations H H H and H, the latter communicating with the furnace A and arranged for directing the air currents in a lengthwise direction within thefurnace. The proportional area of the passage H is approximately one-three hundred and fiftieth (l/850) or thereabout of the grate area. The vents leading into the furnace, while in their aggregate totaling the area of the passage H, are graduated, vent H being the smallest and H the largest; This construction insures an even distribution of the air across the furnace. By making the aggregate area of these openings equal to the cross-sectional area of the passage we prevent or very greatly lessen obstruction to the flow of air through the latter. If they were all at one point, the discharge would be practically as free as if both ends of the pipe were left quite open, one end being the inlet, the other the outlet, and though the holes at first are reached by the air successively and begin discharging one after the other all will discharge simultaneously when the current is once established, so that there can be very little eddying or delay.

The flame tube J provides communication for some portion of the flame to pass from the furnace and through the connecting pipe K to the ignition tube L located within the combustion chamber E. This ignition tube L has the vertical perforations L L L L L L L, which, while in their aggregate totaling the area of the tube L, are graduated, L being the smallest and L the largest. The advantage of the equality of the total area of perforations L to L inclusive with that of the cross section of tube L is Tubstantially the same as that of the air inets.

The location for the ignition tube L is at a sufficient distance in rear of the bridge M, and sufficiently below the perforations formed therein, to insure contact of the flame issuing from the ignition tube with the unburnt gases emanating from the furnace, thus insuring the practical obliteration of smoke.

The bridge is provided with the air passage N, proportioned approximately to one five hundredth (l/500) or thereabout of the grate area, and externally fitted with an air regulator valve I similar in its construction to that upon the tubular passage H, and vents N N N N N N N, for discharging the air into the combustion chamber, and graduated to give an even distribution of the air across the said combustion chamber.

Any desired number of vents may be used in connection with the tubes over furnace door, the ignition tube, or the bridge, according to the size and type of furnace to which they may be adapted.

A simple form of construction is employed in the make up of the flame and ignition tubes by using ordinary screw threaded pipe and standard fittings. The tube J, inserted through the wall M is attached to the T piece J blocked at one of its openings with a screw threaded plug J The connecting pipe K unites that T piece to a similar T piece J which also has its other opening blocked with a screw threaded plug J The ignition tube is then connected with the second T piece, and passed through the wall M into the combustion chamber. The plugs J provide means for inspecting and cleans ing the tube K.

The air regulator valves I are formed by using an ordinary standard screw threaded cap having holes I therein, and provided with a boss 1 pierced to receive a spindle I secured to the circular disk I" which is similarly pierced with holes 1 adapted to coordinate with the holes P. A screw threaded handle I attached to said spindle, is the means for rotating the disk. The holes I in the screw threaded cap and I in the circular disk, are proportioned more or less to three and one-third of the pipe area.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is 1. A steam-boiler furnace having a combustion chamber and provided with a flame tube extending from the furnace proper to the said combustion chamber and a trans- "erse ignition tube supplied by said flame tube within said combustion chamber, this ignition tube being provided with a longitudinal series of discharge holes increasing successively in area in the direction of flow and equaling in total area that of a cross section of said ignition tube substantially as set forth.

2. A steamboiler furnace having a combustion chamber and a bridge wall and provided with a flame tube extending from the furnace proper to the said combustion chamber, and a transverse ignition tube within said chamber having a series of discharge holes increasing in area in the direction of flow and equaling in total area that of a cross-section of said ignition tube, the said bridge wall being provided with a longitudinal air flue and with a series of discharge outlets feeding air to the combustion chamber adjacent to the ignition tube.

3. A steam boiler furnace having a combustion chamber and a bridge wall and provided With a flame tube extending from the furnace proper to the said combustion chamber, and a transverse ignition tube Within said chamber having a series of discharge holes, the said bridge Wall being provided with a longitudinal air flue and with a series of discharge outlets feeding air to the combufition chamber adjacent to the ignition tu e.

In testimony whereof We have signed our 10 names to this specification in the presence of tWo subscribing Witnesses.

HARRY LOWELL PRICE, GEORGE JOSEPH CARTWRIGHT.

Witnesses:

JOHN J. STONE, HARRY A. SMEDLEY.

(Topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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