US601487A - Island - Google Patents

Description

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D. M. THOMPSON. STEAM GENERATOR.

No. 601,487. PatentedMar. 29,1898.

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D. M. THOMPSON.

STEAM GENERATOR. No. 601,487. Patented Mar. 29,1898.

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DAVID M. THOMPSON, OF PROVIDENCE, RHODE ISLAND.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 601,487, dated March 29, 1898.

Application filed July 23, 1897. Serial No. 645,711. (No model.)

To all whom it may concern.-

Be it known that 1 DAVID M. THOMPSON, of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvementin Steam-Generators and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

The invention has reference to an improvement in steam-boilers and furnaces therefor.

The invention consists in the peculiar and novel construction of the steam-boiler, the Water-tube circulating attachment, and the furnace, whereby the more perfect combustion of the fuel in the furnace is secured, the circulation of the water increased, the separation of the steam facilitated,and better economic results secured, as will be more fully set forth hereinafter.

One object of the invention is to secure the more perfect combustion of the fuel and prevent the discharge of black smoke;

Another object of the invention is to separate impurities contained in the water and collect the same below the parts exposed to the action of the fire.

Another object of the invention is to secure the rapid circulation of the water and facilitate the separation of the steam from the water.

Another object of the invention is to facilitate the separation of soot and ashes from the products of combustion to prevent the clogging of the vertical tubes; and a further object of the invention is to reduce the height of the vertical tubular boiler Without impairing its efficiency.

In steam generators as heretofore constructed, and particularly in the type known in the arts as vertical tubular boilers, the furnace was placed below the vertical tubular boiler and the products of combustion i'mpinged on the boiler and passed from the fire upward through the vertical tubes, the volatile gases, with the unconsumed carbon, soot, ashes, and vapor, coming in contact with the surface of the boiler, and the tubes were chilled by the comparative low temperature of the boiler and adhered to the interior surthat the products of combustion from one furnace will pass over the fire of the other furnace and then into a large combustion-chamber, from which they pass down under the ver tical tubular boiler and upward through the tubes of the same to the uptake, or they may surround the lower part of the vertical tubular boiler and, descending, enter the tubes, to be carried to the uptake and chimney. To utilize the radiated heat in these furnaces, I extend a series of water-tubes through the same.

Figure 1 is a vertical section showing the relations of the furnaces, the water-tubes, and the vertical steam-boiler to each other. Fig. 2 is a vertical transverse section on the line X X of Fig. 1, looking toward the front of the steam generator. Fig. 3 is a vertical transverse sectional view showing the two f urnaces, the combustion-chamber, and the water-tubes.

Similar marks of reference indicate corresponding parts in all the figures.

In the drawings, A indicates the furnace on the left-hand side of the steam generator, which, as shown in the drawings, is the furnace to which the fuel has been last supplied; A,t-he furnace on the right-hand side,in which the fire has given up its volatile gases, so that a bright fire burns on the grate; A an arched opening connecting the rear ends of the furnaces; A a swing-gate controlling the front connections between the furnaces A and A 5 an ash-pit door A and a firing-door A The furnaces and the combustion-chamber may be inclosed, and in the preferred form to connect the adjoining cells.

are inclosed, by the cellular casing A consisting of a series of hollow sections divided by vertical partitions pierced with openings The several sections are connected by the pipes A A, and water is supplied to the cellular casing, to be heated and conducted from the casing to a tank or pump, to be delivered to the boiler. The vertical tubular boiler B has its lower tube-sheet at or nearly at a level with the grate-surface of the furnaces, and the combustion-chamberA connects with the flamechamber A under the tubular boiler, by the drop-flue A The transverse wall, supported on the arch A and the wall A prevents direct access to the shell of the vertical tubular boiler in the form shown in the drawings; but this construction may be modified so as to leave an open space around the lower part of the vertical boiler B, closed in at a point below the water-level in the boiler, a method well known and generally practiced in steamboiler construction.

The vertical tubular boiler B is provided with the horizontal cylinder 13, extending through the combustion-chamber A to the front. The pipe 13 extends from the cylinder B downward through the drop-flue A to the mud-drum B and within the pipe 13* is placed a pipe surmounted with the scumcollector B The front end of the cylinder B is provided with the head-fitting B and is connected by the pipe 13, extending diagonally on each side, with the manifolds B B and these manifolds are connected by the pipes B B with the manifolds B B The water-tubes 13 13 extend from the manifolds B B to the manifolds B 13 and from these the water-tubes B B extend downward to the manifolds B B each connected with a mud-trap B From the manifolds B B extend the watertubes B B through the length of the furnaces A and A. The portions of these water-tubes beyond the bridge-wall are bent and connect, by means of the tubes B B with the manifolds B B ,connected each by means of a suitable connecting-pipe with the manifolds B B and these manifolds B 13 are connected by the pipes B with the mud-drum B secured to the lower end of the cylinder 13 extending downward from the central portion of the lower tube-sheet of the vertical tubular boiler B. The feed-water is supplied to the steam-generator through the pipe 13 which extends through the central portion of the vertical tubular boiler B and through the circulating-tube B in the cylindrical projection 13 and ends in a conical nozzle or other suitable distributer within the muddrum B sions as will enable a person to enter and make any required inspection or repairs. The manifolds B B maybe conveniently reached by removing the section G which is disconnected from the cellular casing A The manifolds B and B are reached by opening the door C over the fire-doors A A in the front of the generator. The manifolds are provided with the usual hand-hole covers opposite each of the water-tubes.

To enable others skilled in the art to use my invention, I will describe the operation of the same more fully.

Before lighting the fire in the improved steam-generator the boiler is to be filled with water until the horizontal cylinder B is at least half full, and the water-line is maintained above the horizontal center of the cylinder B. The fire is first lighted in one of the two furnaces A or A, and the products of combustion are passed through the other fur- -nace into the combustion-chamber and from this through the drop-flue and the tubes of the vertical boiler to the chimney. As soon as the fire burns brightly the firing and ashpit doors of this furnace are closed, the other furnace is lighted, and the smoke and gases of this furnace are made to pass by the adjustment of the gate A through the opening A and over the fire of the first furnace. This alternate firing of one furnace after the other and the passing of the products of com bustion of one furnace over the incandescent fire in the other furnace is continued. WVhen the brickwork has been thoroughly-heated, the arches over the furnace that is being supplied with fuel greatly facilitate the combustion of the fuel and the combustion of the volatile gases disengaged by the combustion of the fuel. These gases pass from the furnacein which they are generated through the arched opening A into the other furnace, in which a bright incandescent fire is burning and the arch of which is highly heated. The gases are by this passage from one furnace to the other thoroughly mixed, while they are maintained at the high temperature required for combustion. In this condition the gases pass upward into the combustion-chamber A", the cross-sectional area of which is about three times the cross-sectional area of the furnace. The gases expand and, being surrounded by the heated brickwork, are thoroughly consumed. The heated products of combustion descend to the flame-chamber A and pass upward through the tubes of the vertical tubular boiler to the uptake and chimney. Neither soot nor smoke enters the tubes of the boiler, and the fine ashes usually carried into the tubes are precipitated in the combustion-chamber and flame-chamber, owing to their great cross-sectional area and slower movement ofthe gases.

The water heated in the cellular casing under atmospheric pressure by the heat carried through the brickwork into the casing is IIO heated through the manifolds B 3 B B an d the connecting-pipes into the front end of the horizontal cylinder B, where the liberation B and carried to the mud-drum B of the steam is facilitated by the extended I water-surface, the level of which is maintained by the connection of the horizontal cylinder with the vertical steam-boiler B and the pipe B through which the surplus water is conveyed to the mud-drum B the lower end of which is connected by a large pipe with the mud-drum B under the vertical steam-boiler B, thereby securing the rapid circulation of the water through the watertubes, the liberation of the steam, and the maintenance of a reliable Water-level. The impurities are gathered by the scum-collector A portion of the water ascends from the manifolds B B through the vertical water-tubes B B to the manifolds B and thence through V the water-tubes 13 to the manifolds B and enters the front end of the horizontal cylinder B, where the steam is separated from the water, the water-level maintained, and the rapid circulation of the water secured in the manner above described with reference to the water-tubes B Circulation of the water is maintained in the vertical tubular steamboiler B by means of the circulating-tube H, the annular space forming ascending curren ts,while the descending currents pass down the tube 13 to the mud-drum. The horizontal cylinder B has large steam and water connections with the boiler B. The steam generated passes freely to the boiler and the large body of water in the boiler maintains the normal water-level in the horizontal cylinder, although the same is exposed to the first action of the heat.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a steam-generator, the combination with the vertical tubular steam-boiler, of two furnaces placed side by side, said furnaces extending above the lower end of the tubular boiler, brickwork inclosing the furnaces,

ed so as to be alternately fired, a combustion-- chamber above the furnaces, a cylinder connected with the tubular boiler at the waterline and extending through the combustionchamber, and a flue connecting the combustion-chamber with the space under the tubular boiler; whereby the fuel is consumed in brick-inclosed furnaces, soot and ashes are retained and the heat is made to enter the tubes of the vertical boiler, as described.

3. In a steam-generator, the combination with the vertical tubular steam-boiler, the horizontal cylindrical extension and the furnaces, of the series of water-tubes B B and B connected with the boiler below the furnaces and with the horizontal cylinder, whereby the circulation of the water in the boiler, the water-tubes and the horizontal cylinder and the separation of the steam are facilitated.

4. 111 a steam-generator, the combination with two furnaces placed side by side andconnected, as described, so that they may be alternately fired, a combustion-chamber above the furnaces, said furnaces and combustion-chamber inclosed in brickwork, a vertical tubular boiler located in the rear of the furnaces, the tube-sheet of which is below the normal level of the fuel in the furnaces, a flame-chamber below the vertical tubular boiler, a drop-flue connecting the combustion-chamber with the flame-chamber, and a cellular casing, inclosing the furnace portion of the steam-generator, provided with watersupply and connecting pipes, whereby the part of the heat held back in the combustionchamber and transmitted through the brickwork is utilized to heat the feed-water, as described.

5. In a steam-generator, the combination with the vertical tubular boiler B, the Vertical cylindrical extension B the circulatingtube B and the mud-drum B of the horizontal cylinder B connected with the vertical boiler at the normal water-line, the tube B the mud-drum B connections between the mud-drums B and B furnaces located on one side of the vertical boiler having the IIO grate practically on a level with the lower end of the vertical boiler, and fines for conveying the products of combustion downward under the vertical tubular boiler, whereby the circulation of the water and the liberation of the steam are facilitated, as described.

6. In a steam-generator, the combination with the vertical tubular boiler 13, the horizontal extension B, the vertical cylindrical extension B the circulating-tube B, the mud-drum B, the vertical tube B the muddrum B and connection between the muddrums B and B of the manifolds B and B connected with the mud-drum B, the

manifolds 13 B and B the water-tubes B connecting the manifolds B through the pipes B with the manifolds B, the water-tubes B and B connecting the manifolds B", B

and B ,'connections between the manifolds B and the fitting B at the front end of the I In Witness whereof I have hereunto set my cylinder B, the furnaces A and A, the comhand.

bastion-chamber A the drop-flue A conr necting the combustion-chamber with the THOMPSON 5 flame-chamber A and the souterrain O, Witnesses:

whereby access is had to the connections be- JOSEPH A. MILLER,

low the floor-level, as described. l JOSEPH A. MILLER, Jr.

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