US498284A - Tme nohbis peters co - Google Patents

Description

3 Sheets-Sheet 1.

(No Model.)

` RMOHLER.

SMOKE GONSUMING FURNAGE.

Patented May 30, 1893.

lill

(No Model.) v 8 Sheets-Sheet 2.

` 41 Y.MOHLBR. SMOKE CONSUMING IEURNAGB.v

No. 498,284. PatentedMay 30, 1893.

' UNITED STATES PAT'EAVFv FFICE.

PAUL MHLER, oF soHwBIsorr GMND, GERMANY.

SMOKE-c oNSiUMlNG FURNACE.

SPECIFICATION forming part of Letters Patent NO. 498,284, (lated May 30, 1893. Application filed August Y24, 1892. Serial No. 443,985. (No model.)

. ing Furnaces,of which the following is a specification.

This invention consists of a smoke-consuming furnace for. steam-boilers provided with' feed-water heaters. i

The invention is shown in the accompanying drawings.

Figure 1 is a longitudinal section, Fig. 2 a cross section and Fig. 3 a plan View of the smoke-consuming furnace, while Figs. 4 and 5 are a side view and plan view respectively in section of a modified construction of the grate.

There is provided'on the front side of the boiler a boiler a of smaller size, preferably pear-shaped, connected by tubes both with the upper or main boiler and with the feedwater heaters. The Water-chamber of thisboiler is intersected or divided by the flue b .leading to the heating tubes ofthe boiler.

Its lower part is surrounded by a basketshaped grate c (see Figs. 1, 2 and 3), whileits upper part is surrounded by a casing or jacket d, terminating at the top in a tube through which the admission of air is controlled by suitable devices. This casing cl surrounds the coal reservoir or magazine from which fuel is automatically supplied to the fire by simply sliding down on to the grate. Suitable peep-holes such as shown in Fig. 4 mayV be provided in this coal-box. The grate in the shape of a basket or cage is erected on uprights or feet upon the masonry and traversed at its lower end by a preferably cylindrical tube e of fire-brick or iron, the orifice ot' which is surmounted by a double cone f. If preferred the inclination of the grate may be steep and its bars so arranged on a curved line as to surround the lower portion of the boiler (see Figs. 4 and 5), its bottom being formed by a slightlyinclined grate sufficiently distant from the upper part to allow of the ready removal of clinkers, ashes and the like.

Atmospheric air is conveyed to the fire through the cylindrical tube e and for this purpose the said tube is connected by a pipe g with an air-channel h. By means of a piston g operated by a horizontal spindle or if preferred bya suitable valve or damper operated from outside (see Fig. 4), the extent to which the orifice connecting the tube with the air channel is opened or closed, may be suitably adjusted. The air-channel h may be arranged within the heating tube or flue of a superheater (Fig. 2) and may be covered with iron plates, whereby the atmospheric air is subjected to a preliminary heating operation. The air then passes into the cylindrical tube surroundedon all sides by incandescent fuel and itself heated to incandescence so that the air is here brought to a Very high temperature. In order still further to raise the telnperature-of the air, metal plates g2 (Figs. 4 and 5) may be inserted into the tube at predetermined intervals apart, and in a position parallel to the longitudinal axis of the tube. In this highly heated conditionthe air through the medium of the double cone-shaped dome surmounting the tube is uniformly diffused in all directions as it issues from the latter, and passing into the furnace it there thoroughly mixes with the products of combustion rising from the grate so that the smoke from the fuel iscompletely consumed or burned, along with the fuel itself. This effect may all the more securely be relied upon, as the products of the distillation of coal are compelled constantly to flow over and in contact with the incandescent surface of the fuel upon the grate, so that their heat is considerably added to by that of the air with'which they are thus caused to mix. The full benefit is therefore derived from the fuel employed, since only just sufficient air is admitted to assist combustion and such air does not arrive in a cold condition; condensation from cooling is therefore entirely avoided, as is also any esca-pe of unburned particles.

Owing to the connection of the grate with a secondary or smaller boiler a connected with the main boilers, the heating of the boiler-water and consequently the production of steam are accelerated, as the volume of water in the boiler directly overlying the furnace rapidly becomes heated to a high temperature and imparts this heat to the feed water in the IOO boiler and superheater. It will also be seen that in this arrangement of furnace full advantage is taken of the radiating heat.

I claim- 1. In combination in a furnace, the main boiler, the drum a, or supplemental boiler arranged below the same, the flue b, extending through the said drum and intersecting the same and the grate surrounding the drum,`

substantially as described.

2. In combination in a furnace, the main boiler, the supplemental boiler or drum a, below the same, the iue b, extending through the said drum, the basket shaped grate about the drum, the air tube e, projecting up to the mouth of the iue Z9, and the air channel 7L,

leading to the said tube, substantially as de-A

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