US330147A - Furnace for steam-boilers - Google Patents

Description

(No Model.) s sheets-sheet 1.

S. T. OWENS.

PURNAGB POR STEAM BML-ERS. No. 330,147. Patented Nov. 10, 1885.

3 Sheets Sheet 2.,

(No Model.)

S. T. OWENS.

PURNAGB FOR STEAM BOILERS.

Inventor.

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3 Sheets-Sheet 3.

(No Model.)

S. T. OWENS.

FURNAGB PoR STEAM BOILBRS.

Patented Nov. 10, 188.5

Inventar.

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FURNACE FOR STEAM-BOILERS.

PEGl-ICATEON forming part of Letters Patent No. 330.147, dated November 10,1885. Application filed November 19, 1884. Serial No. 148,310. (No model.)

To (LZZ whom it may concern:

Be it known that I, SAMUEL T. OwnNs, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new `2 is a longitudinal vertical section through .one of the boilers onthe linear fr, Fig. 3. Figs. 3 and 4 are vertical cross-sections of the batg/ y and a z ofFig. 2, respect- Like letters of reference indicate like parts in each.. 1 v

y The battery consists of Y four cylindrical boilers, a, which are built in and sustained by suitable brick end and side walls, "and are provided with the usualfiues, a; Between the boilers are metallic beams a2, instead of the usual brick-work, and the covering a3 is built up from these beams over the tops of the boilers, said covering being supported at its edges by the beams, which are preferably provided with supporting-anges for thatpurpose. The beams c2 separate the boilers and brace the inner sides of the outer boilers and both sides of the two inner ones. The boilers are further supported by metallic crossbraces a4 placed at intervals along their length. The front ends of the flues a communicate with the skirts a5 of the stacks a6 in the usual way. The combustion-chamber b extends under the entire length of the boilers and up between them to the beams a2, and at the rear end it communicates by openings b in the end wall with a transverse chamber or vertical passage, b2, which in turn communicates with the rear ends of the fines a, so that the flame and products of combustion from the chamber b pass through the openings b and passage b2 to the drawings,

boiler-fines a', and thence through such dues to the stacks. Near the rear end of the furnace is a cave or opening, c, which extends transversely, and in this cave the mud-drum a? of the boilers is situated. In the forward wall of the cave cis a large opening, d, froml which one, two, or more rows of pipes or tubes, @,of refractory material extend forward and open into a vertical chamber or passage, bat the front end of the combustion-chamber. The tubes e are composed of sections d, and are supported at the joints by brick piers e, so that except where the piers occur there are open spaces around them,constituting part of the combustion-chamber, the flame and heat of which circulate freely through such spaces.

These tubes admit air to support the combus tion of the gas in the furnace, and are arranged, as described, in the combustion-chamber so that therair which enters cold through the opening d is delivered into the passage b3 in a highly heated condition. Extending horizontally along the front of the furnace is a gas-pipe, f, which receives its supply of gas from the pipe f', and distributes it properly to the furnace by means of branch pipes f2,

which extend through front wall and discharge into the combustion chamber at suitable intervals 'at or near the upper end of the passage b3. The supply of gas is controlled by a valve, g, in the pipe f.' Extending along the inner side of the front wall, below the mouths of the pipes f 2, is a small perforated pipe, h, which is connected by a small pipe, h', with the gas-supply pipe f above the valve g, so as to'be unaffected by the said valve. It is provided with an independent regulatingvalve, h.

The purpose of the perforated pipe h is to keep a small flame constantly burning in the furnace, so that when the gas is turned on in the main pipe f it shall be instantly ignited, and the danger of explosions by reason of the collection of avolume of gas in the chamberb be greatly lessened. A further purpose is to keep sufficient heat under the boilers at all times to obviate all danger of their freezing in cold weather.

If desired, aburner, i', Fig. 1, supplied with IOO gas from the mainf by a pipe, t', may beprovided for lighting the boiler-room.

tion of my improved furnace is as follows, Viz: The gas is turned on and ignited as it enters the chamber b. The air which supports the combustion enters from the cavecthrough the opening dand tubes c. At rst, the tubes l e being cold, the air is at the natural temperature, but the tubes c, being exposed to the heat of the furnace, soon become very hot, and the air is highly heated in its passage 1o through them, and meeting the gas from the pipes f2 in that condition effects its perfect combustion. v

Practical experience has demonstrated that the best results with natural gas are obtained by supplying it cold, andthe air in a highly tor superheated condition. The higher the temperature of the air the better. This conydition has been best attained by the use of checker-work regenerators, or hotblast stoves;

but these, structures are of too expensive a character to be applied to ordinary boiler-furnaces. lAttempts have been made to accomplish the same result wit-hout such expense `by bringing the air in through passages formedv in the walls or bottoms of furnaces of various forms; but such attempts have been attended with indifferent success, not one of them approaching in any eiiicient degree the results obtained by the use ofy regenerators. On the other hand, my improved furnace not only gives a temperature to the air which for all practical purposes is as efficient as that produced bya regenerator, but also brings the gas to the point of combustion in a cold state.

The back wall of the combustion chamber b, with its openings b', constitutes an important feature, as it acts as a break to the flame and intercepts and throws back into the chamber a large quantity ofthe heat. It also affords a vmeans of regulating or adjusting the draft of the furnace.

c No two furnaces are exactly alike, and betqter results may inmany cases be obtained by changing the size of the throat. This can be accomplished with ease in my furnace by simisting furnaces. It is applicable to other uses.

I amaware that it is not new to pass air for supporting combustion through tubes or pipes heated by a furnace for the purpose of heating 6o the air before it is lead to the combustionchamber. I am also aware that perforated bridge-walls and checker-work are not new in furnaces.

What I claim as my invention, and desire to secure by Letters Patent, is'- 1. Ina boiler or similar furnace, the combination of the transverse cave or opening c,

refractory pipes or tubes e, situate in the combustion-chamber b and communicatingl with 7o the cave c and extending forward and opening into the vertical passage b3, the upper end of which opens into the combu'stionchamber b, substantially as and for the purpose specified.

2. The combination of air-heating refractory pipes situate in the combustion-chamber and communicating at one end with a transverse open air-passage, and at the other end with a vertical passage which leads up into thevcombustion-chamber,with gas-distributing pipes which enter through the front wall and discharge at or near the upper end of the said vertical passage, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 17th day of November, A. D. 1884. v

Witnesses: SAMUEL T. OWENS.

W. B. GoRwIN, JNO. K. SMITH.

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