US1339859A - Furnace - Google Patents

Description

W. H. NIELD.

FURNACE.

APPLICATION FILED MAY 7. 1917.

1 ,339,859, Patented May 11, 1920.

Wxljsses SW ET: y W. HJweLa UNITED STATES PATENT OFFICE.

WILLIAM HERBERT NIELD, OF, STOCKPORT, ENGLAND, ASSIGNOR 0F ONE-HALF TO WILLIAM MELLAND, OF MANCHESTER, ENGLAND.

FURNACE.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed May 7, 1917. Serial No. 167,095.

To all whom it may concern Be it known that I, WILLIAM HERBERT NLELD, subject of the King of Great Britain, residing at Stockport,in the county of Chester, in the Kingdom of England, have invented certain new and useful Improvements in and Relating to Furnaces, of which the following is a specification.

This invention relates to improvements in furnaces of the type in which fuel is subjected to a partial distillation by being passed to the back of the furnace in a tube or retort prior to falling upon the furnace grate proper.

According to the present invention the fuel is continuously and automatically conveyed to the back of the furnace in the upper part of a flue and is'dropped on to the furnace grate in a wholly or partially coked condition, to be then fed continuously and automatically by means of a moving grate.

The invention will be more particularly described with reference to a fire tube boiler taken by way of example, but it is to be understood that it is generally applicable and is adaptable to the present existing boilers.

The present invention is more particularly described with reference to the accompanying diagrammatic drawings, in which Figure 1 is a section through a Lancashire or fire tube boiler with the arrangements of the present invention.

Figs. 2 and 3 are details of modifications.

Fuel is fed to a hopper 1 and from thence it passes to a tube 2 extending into a tube of any desired cross-section 3 running into the fire tube or flue and which may be suspended from the top of the flue. By means of the tube 3, the fuel is carried the length "of the fire and deposited at the back of the same, consequently being subjected to the heat of the furnace before reaching the 'grate proper. The means of conveying the fuel to the back of the grate may be in the form of a plate cutting off part of the flue partially or wholly, or as shown in the form of a complete tube. The extension 2 is provided with an opening 4 past which a piston 5 reciprocates to pick up a charge of fuel and force it into the'tube 3.

As a further means of insuring travel of the fuel in the tube 3 conical plates 6 may be arranged on a rod 7 running centrally of the tube 3, or again pairs of pivoted plates 18 (Fig. 3) which will swing back on the outstroke but will catch an accumulated charge of fuel and push it over as the piston 5 moves inward.

The inneriend of the tube may taper outward as shown at 8 to compensate for the "increased volume of the fuel due to partial or complete coking. The tube 3 or its equivalent may be of metal, such as cast iron, or may be of other refractory material such as fire clay, silica, or the like substance, or again of metal covered with fire clay or the like. Or again, it may be held at the front end of the furnace by means of a clamping band 9 or a flange to allow of it being turned from time to time to present a different under surface to the fire on the grate beneath.

The fuel falls from the inner end of the tube 3 on to a grate 10 which is adapted to feed the fuel back again in the reverse direction toward the front end of the furnace. The grate 10 may be a chain grate or may consist of reciprocating bars as shown diagrammatically, in which case it is preferred to have stepped bars, the steps 11, 12, 13 of which preferably increase in length toward the front of the boiler. As therefore the bar. moves under the firebridge 14, fuel will be moved from one step 10 on to the next step 11 and so on.

The bars 10 are supported at the back by a furnace bridge 14 which latter may support a baffle plate 19 preferably perforated which will act as a radiating surface and particularly as an igniting surface for the gases evolved by the partial distillation of the fuel in the tube 8. The tube 3 may be suitably perforated if so desired to allow of release of gases otherwise than through its inner end. a

In a modified form of tube asshown in Fig. 2, the fuel may be fed along the tube by a rotating screw conveyer 15 supported by the walls of the tube 3. The conveyer 15 is mounted preferably on a hollow shaft 16 through the perforation 17 of which a poking bar may be inserted to break up any agglomeration occurring at the inner end of the tube, or again this perforation may be used for cooling the shaft or for the introduction of steam to the furnace.

I declare that what I claim is In combination, a furnace, a coking chamber exposed on all sides to the heat there- In Witness whereof I have hereunto from and arranged to deliver fuel to the signed my name this 14th day of March, 10 rear of the furnace, means for feeding fuel 1917 in the presence. of vtwo subscribing through said chamber, a rate formed to Witnesses.

feed the fuel to the forwar end of the fur- WILLIAM HERBERT NIELD. nace and means for simultaneously operat- Witnesses: ing the fuel feeding means Within the cok ERNALD SIMPSON MosELEY,

ing chamber and for moving the grate. MARION E. CLOUD.

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