US2150481A - Furnace - Google Patents

Description

R. L. BEERS March 14, 1939.

FURNACE Filed May 4, 1956 2 She'ets-Sheet l R. L. BEERs 2,150,481

FURNACE Filed may 4, 193e `2 sheets-sheet 2 March 14, 1939.

INVENTOR I ROYCE L-BEERS BY l TTORNEYS Patented Mar. 14, 1939 2,150,481 rivaliser:

Royce L. Beers, Birmingham, Mich., assigner to Detroit Stoker Company, Monroe, Mich., a corporation of Michigan Application May 4, 1936, Serial No. 77,8

3 Claims. (Cl. 110 115) The invention relates to furnaces of that type provided with the so-called sprinkler fuel feed. With such constructions, the fuel is periodically delivered to a rotary impeller by which it is hurled into the furnace and is distributed over the grate. Adjustment is made to obtain as uniform a distribution of fuel as is possiblefbut it has been found that there is a tendency for the fuel to accumulate adjacent to the rear or bridge wall of the furnace. 'I'his ls due to the momentum of the particles of coal that strike the fuel bed on the grate which causes them to roll, slide or glance along the fuel bed and form a triangular shaped pile adjacent to the bridge wall. It has been found with this type of Stoker that if the fuel bed is of a uniform depth over the entire grate there is practically no tendency for smoke to form nor for an accumulation of clinkers. However, if the fuel bed thickness does vary there is a tendency for both smoke and clinkers.

It is the object of the present invention to avoid this diiculty and to this 'end the invention consists in the construction as hereinafter set forth.

In the drawings:

Figure 1 is a vertical longitudinal section through a furnace to which my improved construction is applied;

Figure 2 is a cross-section showing the grates and the inclined tuyre at the rear thereof;

Figure 3 is a diagrammatic view similar to Fig' ure 1 showing a modied construction;

Figures 4 and 5 are respectively a front elevation and a side elevation of one of the tuyre units.

As illustrated in Figure 1, A is the furnace front having mounted thereon a rotary impeller B periodically receiving fuel from a hopper C through the operation of a pusher D. The fuel delivered to the impeller is thrown through an opening E so as to be distributed over the grate. This grate comprises stationary horizontal tuyre plates F and G respectively at front and rear, and a series of rocker grates I-I in between the same. These rocker grates are actuated through the medium or rock arms I connected thereto, a connecting bar J, a pivotal link K and a uid operated motor comprising a cylinder M and piston having a rod N connected with the link K. Thus, the grates are periodically rocked to remove the ash accumulating above the same.

As previously stated, there is a tendency with this type of furnace for the fuel to accumulate in a pile -adjacent to the bridge wall which increases the thickness of the fuel bed at this point and has a tendency to form smoke and produce clinkers. I have, however, avoided this result by placing adjacent to the rear wall O an inclined tuyre P, the lower end of which is on the level of the tuyre plate G. The tuyre P is preferably formed of a series of units each being of a substantially triangular shape with an inclined side P having a series of horizontal channels P2 along one edge thereof. Upon the opposite edge is a series of projecting lugs P3 which hook under portions between the channels of the adjacent unit. Thus, in the series there are Openings between adjacent units for the horizontal discharge of air. Each unit also has a web portion P4 forming the bottom of the triangle and resting upon a suitable support, such as the channel bars Q and Q. There is also a hook Pli on this web which engages one of the flanges of the channel bar Q' thereby holding the tuyre unit in position. The forward end of the unit also abuts against the side G' of the tuyre plate G, while the rear edge abuts against the wall O. Thus, these units can be easily installed and replaced, and when in position will be securely held.

With the construction as described, the fuel which accumulates in a pile adjacent to the rear or bridge wall will be over the inclined tuyre P, so that by reason of this inclination the thickness of the bed is no greater at this point than over other portions ofv the grate. Furthermore, air passing through the channels P2 will blow horizontally through the fuel resting upon the tuyre and facilitate its combustion. As a result, the fuel at the rear end of the furnace will be consumed as rapidly as that which falls upon the grates and without smoking or the formation of clinker. The avoidance of forming clinker is due to the fact that where the thickness of the fuel bed is not excessive the temperature within the bed will not be high enough to form clinker.

The construction shown in Figure 3 is similar to that in Figure 1 with the exception that a stationary grate is used in place of the rockable grate bars. With this construction, also, the inclined tuyre is arranged between the horizontal grate and the rear or bridge wall which serves the purpose previously described. With both constructions there is very little tendency for clinkering and no tendency for the ash in the fuel bed to adhere to the brick wall.

`What I claim as my invention is:

1. In a furnace, the combination with a horizontally extending grate and a sprinkler type fuel feed including a rotary impeller arranged at the front of the furnace to distribute fuel longitudinally over said grate a wall extending across saidfurnaceattherearofsaldgrateanda series of tuvres inclining upward from the grate and extending across the furnace adjacent said wall the inclination of said twres being such in relation to the angle of friction that fuel dropping thereon will not greatly exceed in depth that upon the horizontal grate.

2. In a furnace, the combination of a sprinkler type fuel feed including a rotary impeller arranged at the front of the furnace to distribute fuel longitudinally thereof, a horizontally extendinggrate,awallattherearofsaidgrateon which the fuel is deposited, a beam adjacent to said wall and a series of inclined tuyre units extending across the furnace supported on said beam and located between said rear wall and grateeachof saidunitshavlngchannels onone edge thereof providing air passages between the same and the adjacent unit the inclination of saidtuyresbeingsuchinrelationtotheangle of friction that fuel dropping thereon will not greatly exceed in depth that upon the horizontal grate.

3. In a furnace, the combination of a sprinkler type fuel feed including a rotary impeller ar; ranged at the front of the furnace to distribute fuel longitudinally thereof; a horizontally extending grate, a wall at the rear of said grate on which the fuel is deposited. a beam adjacent to said wall, a series of inclined tuyre units extending across the furnace supported on said beam and located between said grate and wall each ofsaidunitshavingchannelsononeedgethereof providing air y es between the same and the adJacen't unit, said units being further provided with hooks for ensuing a flange of said beam by which they are held in position the inclination of said tuyres being such in relation to the angle of friction that fuel dropping thereon will not greatly exceed in depth that upon the horizontal grate.

" ROYCE L. BEERB.

Images