US613614A - Downdraft boiler-furnace - Google Patents

Description

Patented Nov. I, I898. G. H. WAT-SON.

' DOWNDRAFT BOILER FURNACE.

(Application filed Feb. 28, 1898.

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Patented Nov. I, I898. G. H. WATSON.

DOWNDBAFT BOILER-FURNACE.-

(Apialication filed Feb. 28, 1898.)

3 Sheets-Sheet 2.

(No Model.)

, 1w 45 M R QQQVQ IIIIIHII Ii No. 6I3,6l4. Patented Nov. l, I898.

G. H.-WATSON.

DOWNDBAFT BOILER FURNACE.

(Application filed Feb. 28. 1698.) (N0 Model.) 3 Sheets-Shoat 3.

UNITED STATES PATENT OF ICE.

GEORGE H. WVATSON, OF CHICAGO, ILLINOIS.

DOWNDRAFT BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 613,614, dated November 1, 1898.

Application filed February 28, 1898. Serial No. 672,019. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE H. WATSON, a citizen of the United States, residing at Ohicago, Illinois, have invented certain new and useful Improvements in Downdraft Boiler- Furnaces, of which the following is a specification.

This invention relates to downdraft steam boiler-furnaces; and it consists in an improved arrangement of the pipes constituting the water-grate and in a novel combination of the water-grate and circulating-pipes with a sediment-collector located outside the boiler-setting.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a vertical longitudinal section of one form of my improved downdraft boilerfurnace. Fig. 2 is a similar view of the in-' vention, showing a modified arrangement of the water-grate. Fig. 3 is a transverse sectional elevation of that form of the invention shown in Fig. 1 wherein the pipes composing the water-grate are turned upward at their rear ends and connected with a header that communicates with the boiler. Fig. 4 is a transverse sectional elevation of the furnace shown in Fig. 2 wherein the pipes of the water-grate are turned downward at their rear ends and connected with a header that communicates with the circulating pipes. Fig. 5 is a rear elevation of the furnace arrangement shown in Fig. 1. Fig. 6 is a rear elevation of the furnace shown in Fig. 2.

In the drawings, A designates a horizontal fire-tube boiler, B the furnace, and O a sediment collector or receptacle located outside and preferably at the rear of the boiler-setting.

The water-grate consists of a number of pipes or tubes 1, that connect with a header 2 at their front ends and with a header 3 at their rear ends. As shown in Figs. 1 and 3, the rear header 3 may connect with the sides of the boiler through pipes 4 and 5 for delivering into the boiler hot water from the water-grate. The ends of the headers 2 and'3 are preferably provided with caps or manhole-covers 6 to give access for cleaning.

In the construction shown in Fig. 1 the front header 2 connects by tubes 7 with cir culating-pipes 8, that are extended rearward through the bridge-wall D and through the combustion-chamber of the furnace and rear furnace-setting and beyond this communi cate with the sediment-collector O, that receives cooled water through pipe 9, leading from the lower rear part of the boiler. The sediment collector or receptacle 0 is provided with suitable blow-off devices or connections of any well-known character, and its location outside the boiler-settin g makes it readily accessible at all times.

From the receptacle or collector O the circulation is through the pipes 8 to the header 2, Figs. 1 and 3, thence through the tubes 1 of the water-grate to the header 3, and thence through the pipes 4 and 5 into the boiler, returning again to the receptacle 0 by way of the pipe 9, that leads from the rear lower part of the boiler.

It will be observed that in the construction shown in Fig. 1 the rear ends of the watergrate pipes 1 are turned upward to connect with the header 3, which in this case is close to the boiler-bottom. In front of these upturned rear ends of the pipes 1 there is placed a screen or baffle 10, of tile or suitable refractory material, to prevent the passage of flame and products of combustion directly rearward between the said upturned rear pipe ends and to force the flame downward toward the subgrate of the bridge-wall. The tile screen 10 maybe supported on rear portions of the pipes or tubes 1 and should be in close proximity to or in front of the header 3.

Instead of turning the rear ends of the water-grate pipes 1 upward they may be turned downward, as shown in Figs. 2 and 4, and in this case the circulating pipes 8 will connect with the rear header 3 instead of the forward header. The rear header 3 is now lowered onto the bridge-wall at about the level of the subgrate 12 or somewhat below the same, if desired. The front header 2 will now connect with the boiler through pipes 13 14, that may enter the boiler-bottom, as shown in Figs. 2 and 4, or, as shown by dotted lines in Fig. 4, the pipes from the header 2 may connect with the boiler near its top. When the rear ends of the watergrate pipes 1 are thus turned downward, a tile screen 15, Fig. 2, will be ar ranged between the boiler-bottom and the rear portion of the water-grate 1 to divert the flame and products of combustion downward onto the subgrate 12 and thence between the downward turned rear ends of the pipes or tubes 1 and so rearward over the bridge-wall. Tile 16 is supported above the forward portion of the water-grate between the boiler and the furnace-front.

By either described arrangement of watergrate and its headers the circulation is greatly promoted and there is a rapid and economical generation of steam, resulting also in a large saving of fuel. Besides this, all the parts of the steam-generator are readily accessible for cleaning and repairs.

That I claim is- 1. In a downdraft-furnace, the combination with a boiler, of a water-grate composed of pipes or tubes having downward-turned rear ends, a header connected with the said downward-turned rear ends of said pipes, circulating-pipes communicating with said header, a refractory screen or wall between the boiler and the rear portion of the watergrate to divert the draft downward and rearward between the downturned rear ends of the pipes composing the grate, and a header through which the water-grate communicates with the boiler, substantially as described.

2. In a downdraft-furnace, the combination with a boiler, of a water-grate composed of pipes or tubes having downward turned rear ends, a header connected with the said downward-turned rear ends of said pipes, circulating-pipes communicating with said header, a refractory screen or wall between the boiler and the rear portion of the Watergrate to divert the draft downward and rear- Ward between the downturned rear ends of the pipes composing the grate, a header through which the water-grate communicates with the boiler, a sediment-collector in rear of the boiler-setting, circulating-pipes extended through the furnace and connecting with the water-grate and sediment-collector, and a pipe connecting with the sediment-collector and boiler, substantially as described.

I In testimony whereof I affix my signature in presence of two witnesses.

GEORGE II. WATSON.

Witnesses:

HENRY E. COOPER, WALTER DONALDSON.

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