US1620659A - Clinker grinder - Google Patents

Description

March 15 1927. I 0,659

' F. HODGKINSON CLINKER GRINDER Filed April 12. 1921 [AHA FR (was Hovcmmsou INVENT R- AITORNEY I Patented Mar. 15,1927. f

UNITED STATES worse more nonexmson, or swnnrnmonn, PENNSYLVANIA, ASSIGNOR 'ro wns'rmei HOUSE nnncrnre Ann MANUFACTURING COMPANY, A conrona'rron or PENN- srnvnm.

, cnnvxnn. GRINDER.-

npplieation filednpril 12.11921. Serial No. 460,789. 4

My invention relates to clinker grinders for mechanical stokers and more particularly to clinker grinders located at the" end of a progressive feed grate, and it has for its 010- 6 ject to produce an apparatus of the character designated which shall be simple in operation, and rugged in construction and which shall effectively break up clinker and ash,

before they are discharged into the ash pit.

In the accompanying drawing, the single figure is a diagrammatic view, partially in section, showing an apparatus constructed in accordance wlth my invention as applied to a stoker furnace.

The efliciency of a mechanical stoker is measured to a large degree by the amount of heat which can be extracted from the fuel supplied to the boiler furnace. The difficulties usually encountered in fuel'combustion' by mechanical operations are to obtain a complete fuel combustion and a ready disposal of the clinker and ash. Owing to the high 'ash content of many fuels now on the market, much difliculty has been experienced from the chokin up of the ash discharge means, commo y known as bridgmg over. Brid g over occurs when mol-.

ten clinker ash c oses over the space'between the active grate and the bridge wall. I have discovered that by placing a device constructed in accordance with my invention beneath the discharge end of a mechanical stoke}? 1flurnatce Idreduce to a lalinlimum any possi 1 'ty 0 bri ging over an c ogging up of the ash disposal apparatus. I further ditional air supply means whereby all of the fuelisconsumed and only ash and clinker are discharged into the ash pit.

Referring to the drawing for a more de- 1 tailed description of my invention, I indicate a fuel hopper 10 from which fuel is fed into a furnace 11 by a fuel feeding ram 12 .operated by a convenient mechanical drive means 13. a

During the course of combustion fuel travels over the inclined grate surfaces of the furnace 11 and upon reaching the lower end v should be entirely consumed and the ash discharged into a pit 14. 4 s The pit 14 is formed by two convergingdiverging side-wall members 15 and 16 which are pivoted at their lower ends at points 17 and 18. The upper portions of the members 15 and 16 are provided with lugs 19 and 20, respectively, to which'operating lmksare secured, as hereinafter more fully described. Located beneath the convergingdiverging members 15 and 16 are two toothed rollers 21 and 22 mounted on shafts 23 and 24. The rollers 21 and 22 are spaced relatively closer together than the converging diverglng members 15 and 16 at their posltion of closest proximity.

The side members 15 and 16 are given relative movement by the stoker drive mechanism 13. A variable throw device 25 of any suitable construction is pivoted to the drive mechanism at 13. A rod'27 is connected to the variable throw device 25 the two forming 28, the latter being oscillatory about a fulerum member 29 secured to the furnace set- In link 26 which connects one arm of-the bell crank lever 28 and the lug 19' of the sidewall member 15 is a yieldable device 30 provided with a yieldable'means 31 of any well known and suitable construction. A similar yieldable means is placed in link 32.

The lower arm of the bell crank lever 28 is connected to the lug 20 of the side wall member 16 by. any suitable arrangement of levers. 1 As shown, a link 32 extends between the 1 lower arm of the bell crank 28 to the lower end of a lever 33 which is fulcrumed at its upper end 'to the furnace setting as at 34. A link 36 connects the lever 33 to the lug 20.

The arrangement of the operating mechanism above described is preferably such that the side-wall members ,15 and 16 are when at their inner positions, in alinement with the furnace side-walls'37 and 38 of the ash discharge parts of the furnace.

During the working down of the clinker and ash through the pit 14, I secure the combustion of any unburned portions of the fuel by providing air ducts 39 in the side wall members 15 and 16 to allow admission of air from suitably arranged air chambers 40 and 100 41 located at each slde of the ash discharge apparatus. 1 r

The operation of my invention is as follows:

Fuel is fed into the furnace 11 by means 105 of the feeder mechanism located in the front of the furnace The fuel travels along the grate surface where the combustible portions are largely consumed. The non-combustible portions of the fuel, especially of fuel hav- 0 tween the sides.

ing high ash content, leaves the rear of the grate in large sheets or masses of fused 15 and 16. It should be noted that the convergingwdiverging wall members in their inward and outward movement crush any clinker and ash that is too large to pass be The rollers 21 and 22 beneath the side members are arranged to grind to a requisite fineness all clinker and ash that passes between the side members. The diverging portion of the side members freely admit all material to the grinders and this eliminates all troubles heretofore experienced from clogging up of the clinker grinding apparatus.

During the process of fuel combustion it is obvious that some unconsumed fuel is carried into the ash pit 14 and in many of the installations now in use this unconsumed fuel is passed on into the ash pit as waste.

I'p'rovide for, complete combustion by providing the series of air inlet ports 39 to which air under ressure is supplied by forced draft where y, during the agitation of the unconsumed fuel and ash in the ash discharge means by movement of the side members, the fuel is entirely consumed thereby obtaining the greatest heat content of the fuel consumed. Again, in using a fuel with a high-ash content, large masses of molten clinker ofttimes bridge over the entrance. to the ash discharge means and cannot be crushed by the rollers usually provided in such installations, and all clinker and ash iswithheld from the crusher. By employing an apparatus constructed in accordance with my invention the sides of which are pivoted at their lower ends and oscillated by links at their top portions such that a relative squeezing motion is imparted to the sides,

the clinker and 'ash coming in contact withthe sides are crushed and worked down to the throat of the ash discharge means and any clinker or ash passing the throat will be readily received and crushed to the requisite degree of fineness by the rollers 21 and 22 located below. I further provide for a yieldable means in the operation of the ap aratus whereby should any unbreakable su stance enter'into the pit 14 said means will'yield and thereby prevent any serious dama e to the primary crushing apparatus. 33y constructing t e apparatus in the form of a converging-diverging pit, the ash and clinker are more readily worked through and all possibilities of clo ging heretofore experienced in clinker grin er constructions are avoided While I have shown my invention in but one form, it will be-obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire,therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or'as are specifically set forth in the appended claims.

What I claim is: I

1. In combination with a mechanical stoker having a drive mechanism and a progressive feed grate, an ash discharge apparatus located beneath one endgthereof comprising two oppositely-disposed side walls, the walls shaped to form an ash receptacle having a converging-diverging vertical section, and means cooperatively associated with the drive mechanism to impart a relative movement to the side walls of the apparatus.

2. In combination in a progressive feed furnace, a driving mechanism for the progressive feed, an ash discharge apparatus associated with the furnace comprising opposedly disposed converging-diverging walls pivoted at their lower ends, link means operatively connecting with the drive mechanism and the upper portions of said walls, crushing rollers located beneath the movable walls in such a manner that material passing between the walls will fall freely into the apparatus at the end of the grate comprising two convergin -diverging wall members pivoted at their ower ends, means'operatively connecting the up er portion of the wall members and the drive mechanism, including a variable throw mechanism and a yieldable connection, and crushing rollers arranged beneath the o ning between the wall members, formed t; the convergingdiverging sides to ind any material passing between the si e wall members during their oscillatory movement.

4. In combination with a progressive fuel feed stoker, an ash discharge ap aratus comprising a pair of oscillatory si e walls, pivotally mounted at their lower ends in opposed, cooperative relation, means actuated, by. the fuel feed mechanism to oscillate the side walls toward and from each other I tal section intermediate the top and bottom,

pivotal supporting means for said walls associated with their lower portions, and means to oscillate the walls to and from each other about said supporting means.

7. An ash discharge apparatus for stokers comprising oscillatory side walls forming an ash receptacle having a throat portion between its top and bottom, means oscillating the walls to and from'each other to efiect a minimum distance between the walls.

9. In combination with ,a stoker, an ash receptacle having a restricted section between the top and bottom thereof comprising pivotally mounted converging-diverging oscillatory side walls adapted to receive ash from the stoker, air supplying means in the converging portion of the receptacle,

and means for oscillating the walls at a fre quency in proportion to the stoker speed.

10. In combination with a stoker, an ash receptacle of converging-diverging sectionforming a restricted area intermediate the to and bottom thereof having oscillatory si e walls ivotally supported in spaced relation to orm a crusher, crushing rollers beneath the diverging portion of the receptacle to receive ash therefrom, air supplying means in the converging portion of the receptacle, and means oscillating said walls toward and from each other at a frequency in proportion to the stoker speed.

11. In combination with a stoker having a progressive feed grate, an ash receptacle of converging-diverging section forming a restricted area intermediate the top and bottom thereof having oscillatory side walls adapted to receive ash from the grate in the converging portion thereof, crushing rollers beneath the diverging port-ion adapted to receive ash therefrom, and means oscillating thewalls to and from each other at a frequency in proportion to the stoker speed.

In testimony whereof, I have hereunto subscribed my name this 31st day of March, 1921. s

' FRANCIS HODGKINSON.

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