US1373776A - Coal-dust furnace - Google Patents

Description

J.- TAYLOR.

COAL DUST FURNACE.

APPLICATION FILED JLTNE e. 1919.

Patented Apr. 5, 1921'.

2 SHEETSSH EET 1.

I INVENTOR ATTORNEY J. TAYLOR.

C'OAL DUST FURNACE- APPLICATION FILED JUNE 6. 1919.

L573,;"?76 Patented Apr.5,1921.

2 SHEETS-SHEET 2.

INVENTdR ATTORNEY JOHN TA-YIiOR, OF SALT LAKE CITY, UTAH.

' COAL-DUST FURNACE.

To all whom it may concern Be it known that I, J OHN TAYLoR, a citizen of the United States of America, residing at Salt Lake City, in the county of Salt Lake and State-of Utah, have invented certain new and useful Improvements in Coal-Dust Furnaces, of which the following is a specification.

This invention relates to coal dust furnaces adapted to burn fine fuel in suspension and it has for its object the provision of improved means for bringing about an intimate mixing of the fine fuel, such. as coal dust with the necessary amount of air to produce substantially perfect combus-.

tion, together with a combustion chamber of such shape and designed in such manner as to secure a highly efiicient burning of the fuel.

Another object of the invention is to rovide an improved feeding means for 4 eeding powdered coal dust or the like to a combustion chamber wherein means are provided for permitting the passage of larger particles of the fuel past a fan without hitting the blades thereof.

It is intended that the air and coal dust discharged into the combustion chamber shall be ignited by the heat existing therein and by the incandescent condition of bricks constituting the walls thereof.

Further objects and advantages of the invention will be set forth in the detailed description which now follows. 7

In the accompanying drawings 1 Figure 1 is a sectional view through the combustion chamber upon line 11 of Fig. 4, showing a stove or range to which the same is applied, in endelevation;

Fig.2 is a side view of the blowing or feeding apparatus;

Flg. 3 is a sectional view upon line 33 of Fig. 2;

Fig. 4 is a horizontal sectional view through the combustion chamber upon line H of Fig. 1';

Fig. 5 is a vertical sectional view upon line 5-5 of Fig. 1;

Fig. 6 is a plan view of the feeding apparatus; and

Fig. 7 is a side.elevation of the feeding ap aratus with one of the plates removed.

ike numerals designate corresponding parts in all of the figures of the drawings.

Specification of Letters Patent.

'18, 18 and 18".

Patented Apr. 5-, 1921.

Application filed June 6, 1919. Serial No. 302,330.

formed of fire brick 7. The combustionchamber is preferably water-jacketed as indicated at 8. A port 9 leads through the rear wall of the combustion chamber and communicates with a flue 9, through which the products of combustion from the 60mbust1on chamber are discharged into and through the. stove indicated at 10. 11 designates an oil tank from which oil may be fed through a pipe 12 to the interior of the combustion chamber for initially setting the device in operation. The lower part of the v flue 9 is provided with a plug-like closure 13 that is carried by a counter weighted lever 14, the latter being pivoted at 15 and this structure provides means for cleaning out the ashes and clinker that may be pushed from the combustion chamber into the flue 9.

After the combustion chamber has been initiallyheated by oil introduced through the pipe- 12 combustion therein is afterward maintained by a supply of air and fine fuel, such as coal dust, fed into the combustion chamber tangentially through apipe 16. This pipe is preferably waterjacketed as indicated at 17, both the waterjackets receiving their supply through ipes An outlet pipe 18 eads from water jacket 8.

19' designates a coal bin adapted to receive coal dust or other powdered or fine fuel. A slidable gate 20 is movable upon a pipe 21 which projects into the coal bin and has an opening 22 formed in its side. The

- gate 20 is movable with respect to thisopening in such manner as to control the amount of fuel passing therethrough. A worm con- Veyer 23 is disposed within the pipe 21 and feeds the fuel longitudinally therethrough and discharges the fuel through a nozzle'or spout 24 into a fan casing 25. The air inlet opening-for supplying air to the fan is indicated at 21*. The worm 23 receives its motion from a shaft 26 that is driven from a motor 27 by means of pulleys 28 and 29, belt 30, shaft 31, worm 32, and worm gear 33 the latterbeing fast upon the shaft 26. The pulley 28 is mounted upon the shaft 3 1 of the motor and this shaft likewise carries the fan 35 that is disposed within the fan casing 25. A discharge pipe 36 leading from this fan casing forms an extension of the pipe 16.

A funnel like member 37 is carried by a pipe 38 which projects at an angle from the pipe 36 in such manner as to cause air to be drawn thereinto by the force of the blast through the pipe 36. By the plan view of Fig. 6 it will-be seen that the fan casing is provided with a lateral extension 39 in which a channel is formed that lies in alinement with the nozzle 24,and to one side of the fan 35 which permits the larger particles of the fuel to pass the fan without actually contacting with the fan blades. A washer 40 upon the shaft of the fan acts as a'baflie to prevent the fuel from coming in direct contact with the fan.

It is to be noted that when the fuel first enters the combustion chamber it enters at the forward part of said combustion chamber and is discharged into a lateral extension 41 of said combustion chamber which renders said combustion chamber of larger diameter at the forward portion thereof than at the rear portion thereof. The result is that a whirling in a spiral path is set up, and the intimately mixed coal dust and air are brought into contact with heat and light radiated from the incandescent Walls of the combustion chamber and are ignited and burned As the coal dust is heavier than air most of it would crowd against the lower side of pipe 16. To prevent such action I have placed a dent 16 in pipe 16 near its mouth, thus throwing the coal dust in the direction indicated by dots Fig. 1, the air going in the course indicated by arrows as but little of it would strike this dent.

The coal dust being heavier it would not turn and run tangent so quickly as the air but continues straight up and crosses into the path of heated air nearer the center of combustion chamber where it ignites.

The structure herein shown and described a substantially circular combustion cham ber the axis of which is horizontally disposed, a conductor for the products of combustion leading from the rear of said chamber and materially smaller in diameter than said combustion chamber, a flue disposed at right angles to said conduit and a pipe adapted to carry air and powdered fuel, said pipe leading through the side wall of the combustion chamber adjacent the front Tend thereof and discharging tangentially thereinto.

2. In a device of the character described a substantially circular combustion chamber, the axis of which is horizontally disposed, a conduit for the products of combustion leading from the rear of said chamber and materially smaller in diameter than said combustion chamber, a flue disposed at right angles to said conduit a pipe of such size as to carry air and powdered fuel leading through the side walls of the combustion chamber adjacent the front end thereof and discharging tangentially thereinto, and a raised element in said pipe adjacent its point of discharge and disposed at the bottom thereof to deflect the heavier part of the current upwardly at the moment of discharge.

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

JOHN TAYLOR. Witnesses:

ROBERT L. J UDD, I. M. FYFE.

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