US668463A - Steam-generator and furnace therefor. - Google Patents

Description

No. 668,463. Patented Feb. I9. I901. R. SCOTT.

STEAM GENERATOR AND FURNACE THEREFOR. (Application filed Feb. 19, 1900. (No Model.)

2 Sheets-Sheet I.

No. 668,463. 7 Patented Feb. l9, I9OI. R. SCOTT. STEAM GENERATOR AND FURNACE THEREFOR.

[Application filed Fab. 19 1900.) (No Model.) 2 Sheets-Sheet 2.

UNTTFD STATES PATENT @rrrcn.

ROBERT SCOTT, OF LONDON, ENGLAND.

STEAlVi GENERATOR AND FURNACE THEREFOR.

SPECIFICATION forming part of Letters Patent N 0. 668,463, dated February 19, 1901.

Application filed February 19, 1900. $eria1N0. 5,802. (No model.)

T at], whom, zit may concern:

Be it known that 1, ROBERT Soon, a subject of Her Majesty the Queen of Great Britain, residing at London, in the county of Middle sex, England, have invented certain new and useful Improvements in and Connected with Steam-Generators and Furnaces Therefor, of which the following is a specification.

My invention relates to that class of steamgenerators wherein the fuel is placed upon a plate (instead of, as is usual, upon fire-bars) and combustion supported by the introduction of a forced draft through suitably formed and placed twyers.

My principal object is to provide an arrangement for the above purpose and whereby the economies and improvements hereinafter indicated are effected. In particular 1 provide an arrangement that is capable of being inserted within and as easily removed from the furnace of a water-tube boiler, a refusedestructor furnace, or the fine of a Cornish, Lancashire, Scottish, marine, or other similar boiler in lieu or after the removal of the usual fire bars or grate;

By my invention 1 am enabled to use cheaper classes of fuel (for example, small coal or coal-dust) in the furnaces and to render the combustion much more complete, and the arrangementis such that the fuel is consumed in intimate contact with the water to be heated. V

The characteristic features of my invention are that the fuel is placed upon a watercontaining supporting plate through which extend twyers with closed tops and lateral or deflected discharge-orifices that form the only communication between the combustionchamber and a chamber beneath the watercontaining fuel-supporting plate into which air is forced under pressure. The particular construction of twyers avoids the possibility of their becoming clogged or of the small particles of fuel falling through them into the air-chamber beneath, and at the same time the air issuing from them is directed laterally supporting plate.

ter and the series of twyers which pass Vertically up through the fuel-supporting plate and are closed at the top, but have lateral or deflected dischargeorifices through which air is fed to the fuel. These twye s may be made of separate pieces of metal removably secured to the fuel-supporting plate, and the chamber passage or passages in the plate may be connected with the feed-water system or direct with the boiler. The said twyers may also serve to brace the upper and lower parts of the fuel-supporting plate together, and they are fed with air under pressure from the comnon chamber b low the fuel-supporting plate.

In the accompanying drawings,which illustrate my invention, Figure 1 is a front elevation, partly in section; and Fig. 2 is a sectional elevation taken on the line A B, Fig. 1, of a marine boiler with my invention applied thereto. Fig. 3 is a plan of the fuel- Fig. at is a detail, hereinafter referred to, drawn to an enlarged scale; and Fig. 5 is a transverse section throughthe fuel-supporting plate, illustratinga modified mode of construction thereof.

Referringfirst particularly to Figs. 1, 2, and 3, a is the air-chamber, and b is the Waterchamber. The walls of the air-chamber a consist of the lower plate of the water-chamber b and a shell 0. Through the water-chamber 12 pass the twyers d, preferably in the form shown in Fig. 4. These twyers d are closed at their tops and are provided with laterally-directed nozzles 6 immediately beneath, by means of which communication is established with the air-chamber a through the Water-chamber b. If the twyers are screwthreaded, as shown at fand g in Fig. 4, and are screwed into the walls of the Water-chamber 12 up to their shoulders h and then secured in position by nuts t', the said twyers will form a series of stays, thereby materially adding to the strength of the Water-chamber. The twyers are each preferably provided with two diametrically opposite nozzles or discharge- 7 orifices, and the said twyers are preferably arranged in lines and alternate in position, as shown in Fig. 3. Their number is regulated The fuel-supporting plate,with its adjuncts,

. are the side plates.

be held therein by any suitable means, such as attachment to the furnace-front j.

The furnace-front is provided with a gratedoor 19 of ordinary or convenient construction, but is otherwise closed except for the pipe g, by which forced draft derived from a fan or equivalent means (not shown in the drawings) gains admission to the chamber a.

The fuel is fed onto the upper surface of the supporting-plate, where combustion is supported by the forced draft issuing through the twyers d. The water in the water-chamber 19 being in close proximity with the burning fuel is intensely heated. If such waterchamber is intended to form part of the feedwater system, the water will enter by the pipe 1 and beled therefrom to the hot-well by the pipe 3, or it might be fed direct into the boiler by means of an injector, donkey-pump, or other suitable means. Alternatively, if the said water-chamber is to form part of the boiler system, thereby increasing its heatingsurface and producing a rapid circulation, there are provided pipe connections tu (shown in broken lines in Fig. 2) between the waterchamber and the boiler proper.

Fig. 5 illustrates a simple and practical mode of constructing the water-chamber in such a way that the bottom plate can be removed without disturbing the twyers and ready access gained to the interior of the chamber for cleaning or other purposes. 8 is the top plate, 9 the bottom plate, and 10 10 The top plate 8 is secured by rivets 11 or otherwise to the side plates 10, and the bottom plate is secured by bolts 12 or otherwise. The twyers cl arc first screwed into the top plate 8. A nut l3 may next be added. Then a nut or collar 14 is passed up the screwed stems of the twyers to the point shown in the drawings. The bottom plate 9 is fastened to the side plates 10, and finally the nuts 15 are placed in position. It will be obvious that by simply removing the nuts 15 and the bolts 12 the bottom plate can be removed for the purpose of cleaning the chamber bor otherwise.

It will be apparent that material advantain water, because in that case overheating and rapid destruction of the plate occurs, clinker rapidly forms and adheres thereto, and the fuel during consumption on the fuelplate is not in intimate contact with the water to be heated.

In my invention the life of the fuel-supporting plate is prolonged by reason of the water circulation. The water is rapidly heated owing to the close proximity of the burning fuel. Small and cheap fuel can be employed and the same cannot percolate into the air-chamber beneath, because of the imperforate character of the plate and the closed tops of the twyers, while the air reaching the combustion-chamber being deflected laterally is compelled to percolate the fuel and to aid complete combustion.

I claim as my invention- The combination in a steam-generator of a combustion-chamber, a chamber into which air is forced, a fuel-supporting plate interposed between the combustion-chamber and the air-cham ber and consisting of two horizontal parts arranged a suitable distance apart to provide a water-chamber between them, twyers secured to said upper and lower parts of the fuel-supporting plate and serving to brace them, said twyers being closed at the top but having openings in their sides above the fuel-supporting plate, and opening also into the air-chamber below the fuel-support ing plate.

In testimony whereof I have hereunto subscribed my name.

ROBERT SCOTT.

Witnesses:

A. F. SPOONER, J. S.- WITHERS.

Images