US2275492A - Ash discharge means for stokers - Google Patents

Description

March 10, 1942. BEERs 2,275,492

ASH DISCHARGE MEANS FOR STOKERS Filed Nov. l, 1940 INVENTOR.

i BY ROYGE L.BEERS ATTORNEYS Patented Mar. 10, 1942 V UNITED STATES PATENT- OFFICE ASH DISCHARGE MEANSFOR STOKERS Royce L. Beers, Birminghan, Mich., ass ignor to Detroit Stoker Company, Monroe, Mich., a cor-` poration of Michigan i Application November 1, 1940, SerialnNoBGSfifl (Ci. 1lO--l65) 4 Claims.

The invention relates to automatic stokers and forms a continuation in part of my application for patent, Serial No. 281301, filed June 26, 1939, now Patent No. 2,232,507, February 18, 1941. The type of stoker forming the subject matter of the parent application comprises a central underfeed retort and grate bars inclining downward from this retort towards a side wall of the urnace chamber. These grate bars are longitudinally reciprocated to eifect feeding of the uel downward thereon and at the lower end of the grate bars are ash discharge grate bars also oscillated to effect the dropping of the ash into a pit therebeneath. The instant invention relates to the ash discharge means and has for its object the overcoming of a defect in constructions that have heretofore been used. It has been found that the hot ash, together with certain portions of unconsumed fuel, if permitted to contact with the reiractory wall of the furnace, will form clinker adhering to the wall and thus obstructing the operation. The invention, therefore, consists in the means for overcomng this defeat as here. inafter set forth.

In the drawing: y i

Figure 1 is a Vertical section through a portion of\ a urnace provided with my improved ash discharge means;

Figura 2 is a plan View thereof;

Figure 3 is an enlarged elevation of one of the tuyre members;

Figure 4 is an end elevation thereof.

As shown in Figure 1, A is the retort, B are grate bars inclining downward from the side i wall of the retort and supported on rocker memv bers C and D through which a reciprocatory movement is imparted thereto. E are ash discharge grate bars having their upper ends supported on the rocker member D and their lower ends connected to a rocker member F for imparting a substantially vertical movement thereto. With constructions heretofore used, these ash discharge grate bars` extend into proximity to the furnace wall G and the ash is discharged through the restricted space between the bars and wall. However, as above described, such Construction results in the accumulation of clinker and its adherence to the side wall so as to choke the ash discharge passage.

With my improved construction, the lower ends of the bars E are spaced from the wall G and cooperate with metallic members H which project outward from the wall. These members are cooled by air currents passing therearound ,se` that clinker will not adhere thereto. Furthermore, they form a ledge projecting from the furnace wall which will support an ash lining protecting the wall from contact with clinker.

More in detail, the furnace wall G is formed with a horizontally extending recess therein in which is located a metallic channel member I. The members H are formed with a hood portion I-I' which extends outward and downward from the urnace wall and a web portion H which extends inward into the channel member I. The upper edge of the web is formed with a hook H which is adapted to engage a rib I' dependent from the upper fiange of the channel member I. There are also lugs 1 welded or otherwise secured to the lower fiange of the channel member and arranged adjacent to the web portions I-I of the members H. These lugs and also the web portions are formed with registering apertures through which a rod J is inserted to lock all of the members H to the channel member 1. The members H may be formed of unmachined castings having recesses H in the upper surface of the hood 'portion and there will be sufficient space between adjacent ends of the members for the passage of a cooling air current. Thus the mem bers are, in effect, tuyres permitting passage of air therebetween upward into the furnace chamber and thereby being cooled to a temperature too low for clinker to adhere thereto. They furthey form a supporting ledge for ash held thereon by engagement in the recesses H and constituting heat insulation both for the members and a portion of the wall extendng upward therefrom.

In operation, the fuel raised upward in the retort A travels downward on the inclined reciprocatory grate bars B and then onto the ash discharge bars E. The oscillation of the latter bars carries the ash downward between the same and v the members H but leaving a sufficient portion of ash supported on these members to form the insulation previously referred to. consequently, clinker will not adhere either to the members H or to the furnace wall adjacent thereto.

What I claim as my invention is:

1. In a furnace, the combinationwith a wall and ash discharge rocker grate bars inclining downward towards said. wall, of a metallic member projecting outward from the said Wall and inclining downward therefrom into proximity to said grate bars leaving an ash discharge passage therebetween, said member forming an abutment against which ash and clinker are ground, also a ledge -adapted to support ash which will prevent the adherence of clinker to the wall and serve to deflect the same toward the discharge opening,

and permitting rocking movement of the grate bars relative thereto.

2. In a furnace, the combination with a wall and ash discharge grate bars inclining downward towards said wall, of a series of metallic members projecting outward from said wall into proximity to said grate bars leaving an ash discharge passage therebetween and also air spaces between and around said members, the latter being cooled by the passage of air through said spaces to prevent adherence of clinker thereto, said members constituting a ledge adapted to support an ash lining for theportion of the wall above the same.

3. In a urnace, the combination with a Wall and ash discharge grate bars inclining downward towards said wall, of a metallic channel member located in a recess in said wall, a series of metallic members secured within said channel member and projecting outward therefrom into proximity to said grate bars leaving an ash discharge passage therebetween, said members constituting a ledge adapted to support an ash lining for a portion of the wall above the same which prevents adherence of clinker thereto.

4. In a furnace, the combination with a wall and ash discharge grate bars inclining down- Ward towards said wall, of a metallic channel member located, in a horizontal recess in said wall and provided with a rib depending from the upper flange thereof, a series of metallic members each having a hood portion and a web portion, said hood portion projectng outward from said channel member into proximty to said grate bars leaving an ash discharge passage therebetween, said web portion extending into the channel of said member and being provided with a hook for engaging said depending rib, lugs secured to the lower flange of said channel member located to be adjacent to the Web portions of the respective members in the series, and a rod insertable through registering apertures in said lugs and web portions for looking all of said members to said bar.

ROYCE L. BEERS.

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