US1102959A - Steam-generator. - Google Patents

Description

F. P. RUDDER.

STEAM GENERATOR.

APPLICATION FILED JUNE 1, 1912.

1,102,959. Patented July 7, 1914 W ITNESSES INVENTOR "unite:

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FRANK 3953C?" RUEWFJEFV, GF DERBY, ENGLAND, ASGIGNOR T GEORGE FLETCHER AND QGM'E'LNY LIMITED, OF LITGHURCH, DERBY, ENGLAND.

STEAIiI GENEBATOR.

Specification of Letters Patent.

Application filed Eune l. 1512. serial No. 709,996.'

To all whom it may (Gi li/(7171,,

Be it known that 11, FRANK Pnucr Runoicn. u rllilllsli subject, residing at Derby, county of Derby, gland, have invented certain n w and usetol lrnprovenient in Stenni-Uenerutoro, of which the following is a .c,

This invention rel-sites to steam gomwM-nrc mom articularly adapted for use in cane 1 sugar factories Where large reserves of steam are required and the situations of which enerally present exceptional trunsport di culties. 111 such factories, the fuel is principally the refuse fiber from the cane contuining a high percentage of moisture,

and generally of achnrncter that necessitates its being gasified and burnt in a fun none at some distance from the boiler; the products of combustion being led from a 29 combustion chamber and passed over the heating surface of the boiler the transfer offbeat to the Water being almost entirely by means of conduotion. Therefore it will be readily appreciated that the type of stear'n $5 generator most suitable to these conditions,

will be one wherein the gases/are divided and broken up into runny streams of flow, and Eli ibuted evenly over the heating surfuoe, no pl l 89 water,

water tube boilers on the market, embody fully, such advantages, but it is generally admitted, that their thermal reserve, 2'. e.,

their water and steam carrying capacity is' very lirnieelencl such n reserve is of the utmost importance H1 a sugar rectory where the quality of the fuel varies from hour to hour and even the supply may be checked choked with. the line and light ash, carriedin suspension, with the uses from the fiber to fuel; and also the ems or the tubes fare.

with rapid circulation ofthe fiievmel. oi the well known types of burnt away at the firing end of the boiler.

If fired under the shell, the eflic'ienc'y is relatively poor, and the shell is subjected to serious local strains which almost always result in grooving at the seams nearest the combustion chamber, especially where effieientfurnaces and consequent. high temperatlrcs in present.

(b). Large units (for which there is a natural demand with large factories) for 66 high working pressures (which is also now universally specified), become ver heavy and difiicult of transport. In fact, with this type of boiler the heating Surface of single units is practically limited to from 10 2500 to 3000 square 'feet, whereas units having twice this amount of surface are reguv larly desirable.

For these and other reasons; the water tube type of boiler has been used in ma-nyfib factories of recent years, but with these the insufficiency of thermal reserve has a-t,once been felt, and to compensate for this it is often necessar to carry-lend have under steam, more boiler bower than isjictually re quired, to avoid serious preesure fluctuations in ordinary orking. Thi is a disadv'nntuge of considerable importance, the then not only are the capital charges increacedfbut the active heating Surface generally is beingas used inefiiciently. Steam generators have also been proposed in which a scree of water tubes forming part of the maincircubiting symcm are placed between the-futnace and the fire tubes of boiler; 5 1

My invention consists essentially of a com"- posite steam generator comprising Mi external furnace, a fire tube Holler-and d wit-- ter tube boiler the tubes of which latter are interposed between the furnace and'the five tubes so as to form a screen, the Water tube boiler beluga separate unit with water and steam drums formin an independent circulation and being a so connected by pipes to the fire tube boiler. A superlreatur may also be placed between the water tube boiler and the fire tube boiler.

The invention will be fully described with reference to the "accompanying drawing which shows a longitudinal section of the steam generator. The composite steam generator IBEMB 'in two sections a water tube section 'and a tubular shell-section B. The tubes a of the water tube-soctionform a i screen for, the tubular shelliwh ieh receives lbs the gases after they have passed over the said tubes at. The water tube section comprises a steam drum C and a water drum D connected b the afore-mentioned water tubes a, which latter are arranged in-inclined or upright position, an independent circulation takin place through these tubes. The tubular sheli section comprises a unit of a tubular generator B of ordinary construction without a fire box or grate. The water tubes (1 take up the highest heat from the gases and protect the shell of the tubular generator B from the action of the very hottest gases. The tubular unit B is connected with the drums C and D by water circulating tubes 0 and d and with the steam s ace of. the drum, C by a steam pipe 0 the steam bein preferably drawn off from the unit B by t e steam pipe I).

' Baflie plates E of metal or refractory material are placed behind the lower portion of the water tube screen to direct the flow of gases upward so as to traverse the water tubes a and give up a considerable portion of their heat thereto before passing to the ire tubes of the shell section B. A steam superheater G when employed is placed at or near the top of the water tube screen A between the drum C and the shell B so that the ases. impinge thereon before entering the re tubes. The superheater tubes may ,bearranged as shown or in any other suit able manner. For large installations in order to reduce the weight and size for trans fer of heat results and the temperature of the gases is reduced to a moderate temperature before'being passed to the tubular. shell section of the holler, In passing through the screen any ash carried in suspension is separated from the gases and deposited in the ash pit or in ash pockets provided for the purpose.

(5). 'An improved lengthwise circulation will be set up in the shell section due to the rush of water that will take place from tho drum C of the water tubesection to the shell section, through the circulating tubes 0.

(a). A steam and water reserve almost double that of any type of water tube boiler is obtained.

(d). Large installations for the highestpressures may be arranged, without any dif ficulty of transport arising from great Weight of any part. In the largest installa tion the shell sections or units B need not be more than (3 ft. diameter by 10 ft. long, and therefore, the use of very heavy plates for shells and ends would be avoided,

(c). The water tube heating surface section may be added to existing cylindrical boilers, thus forming them into larger and more eflicient installations at relativcly'sniull cost.

What I claim as my invention and desire to protect by Letters Patent is 1. In a steam generator, the combination with a furnace having a flue leading from the combustion cl'ianiber thereof, of a fire tube boiler unit having its tubes connected to receive the heated from said flue, a water tube boiler unit interposed between the fire tube boiler unit and said combustion chamber, the tubes of the water tube boiler unit extending transversely across said flue, and means for causing the heated gases in the flue to How along the tubes of the water tube boiler unit and thence transversely between such tubes and for protecting thc'shcll of the the tube boiler unit.

52. In a steam generator, the combination with a furnace having a flue leading from the combustion chamber thereof, of a fire tubc boiler unit having; its tubes communicating with said flue, an upright water tube boiler unit interposed between the fire tube boiler unit and said combustion chamber and having its tubes extending transversely across said flue, water circulating connections between the lower and upper portions of the water tube boiler unit and the fire tubc boiler unit, and means for dir, g the gases along the tubes of the water tube boiler unit and thence transversely between said tubes and into the tubes of the lire tube boiler unit and for protecting the shell of the latter unit.

3. In a steam generator, the combination with a furnace having a fine leading from the combustion chamber thereof, 0i. a tire tube boiler unit having its tubes communi eating with said flue, an upright Water tube boiler unit interposed between the fire tube boiler unit and said combustion chamber and having its tubes cxtending transversely across said flue, the water tube boiler unit having upper and lower water circulating drums, .water circulating connections between the upper and lower drums of the Water tube boiler unit and the water space of the fire tubc boiler, a steam connection between the upper drum and the steam space of the fire tube boiler unit. and a steam outlet pipe leading from the fire tube boiler unit.

4. A steam generator comprising in its construction, three separate units: an extcr nu] furnace, a water tube unit with inde- 5 and the steam space thereo and a steam superheater placed between the water tube unit and the fire tube unit.

In testimony whereof I have hereunto set my hand in presence of two subscribing wxtnesses this 18th day of May 1912.

FRANK PERCY RUDDER.

Witnesses:

- C. K. Eonowne,

W. H. Bmcxemm.

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