US2978997A - Method and apparatus for the continuous combustion of refuse and the like - Google Patents

Description

April 11, 1961 E. M. PIERCE METHOD AND APPARATUS FORTHE CONTINUOUS COMBUSTION OF REFUSE AND THE LIKE 5' Sheets-Sheet 1 Filed NOV- 13, 1957 INVENTOR.

Edgar M. Pierce HIS April 11, 1961 E. M. PIERCE 2,978,997

METHOD AND APPARATUS FOR THE CONTINUOUS COMBUSTION 0F REFUSE AND THE LIKE Filed NOV. 13, 1957 5 Sheets-Sheet 2 INVENTOR. Edgar M Pierce HIS ATTORNE Y5 April 11, 1961 E. M. PIERCE 2,978,997

METHOD AND APPARATUS FOR THE CONTINUOUS COMBUSTION OF REFUSE AND THE LIKE Filed NOV. 15, 1957 5 Sheets-Sheet 5 INVENTOR. Edgar M. Pierce M fwlw EEWQM I0 H/S ATTORNEYS Aprll 11, 1961 E. M. PIERCE 2,978,997

METHOD AND APPARATUS FOR THE CONTINUOUS COMBUSTION OF REFUSE AND THE LIKE Filed Nov. 13, 1957 5 Sheets-Sheet 4 INVENTOR. E gar M. Pierce col adegvguzpfxml H/S ATTORNE' YS Aprll 1961 E. M. PIERCE 2,978,997

METHOD AND APPARATUS FOR THE CONTINUOUS COMBUSTION OF REFUSE AND THE LIKE Flled Nov. 13, 1957 5 Sheets-Sheet 5 OOOOOOOOOOOOOO00000000000 Fig. 5

INVENTOR. Edgar M. Pierce HIS ATTORNEYS METHOD AND APPARATUS FOR THE CONTINU- OUS CQMBUSTION F REFUSE AND THE LIKE Edgar M. Pierce, Starlight Drive, Morristown, NJ. Filed Nov. 13, 1957, Ser. No. 696,166

3 Claims. (Cl. 110-48) This application relates to method and apparatus for the continuous combustion of refuse and the like. More particularly, it relates to an incinerator and the operation thereof for the disposal of municipal and industrial refuse. Such refuse may include discarded paper, cardboard, wood, rags, plastic containers, garbage, sewage sludge, and other combustible material. Non-combustible materials are also present, such as bottles, metal containers, etc. In accordance with my inventions, such refuse is burned continuously in a furnace. Ash from the furnace is disposed of in a conventional way and the gaseous products of combustion are passed through water scrubbers for removal of fly ash and other impurities before they pass into the atmosphere.

A semi-continuous disposal of industrial and municipal refuse has heretofore been proposed. The apparatus and processes used, however, have not been satisfactory because of certain problems inherent in the disposal of refuse. One difiiculty has been that trucks bringing refuse to the incinerator all deliver their loads within a period of an hour twice daily, once in the morning and once in the afternoon. Obviously, all of the refuse cannot be burned as it is delivered and some arrangement must be made for storage of the refuse before it is burned during the time intervals between delivery of the refuse. Also, the refuse must be continuously fed to a furnace and in a rather loose condition so that a relatively large proportion of the surface of the refuse will be exposed for burning. At the same time that the refuse is continuously fed to the furnace, there must be some provision for sealing the furnace so that the proportion of refuse and air in the furnace can be closely controlled for complete combustion at the proper temperature. Added to these diificulties is the nature of the refuse itself, in that it can include a wide variety of materials in a variety of sizes and shapes, varying from soft garbage to tin cans, bottles, logs, bulky paper boxes, old newspapers, etc.

The method and apparatus which comprise my inventions solve these problems of refuse disposal, as will now be explained.

In the accompanying drawings, I have illustrated certain presently preferred embodiments of my inventions, in which:

Figures 1A and 1B comprise a side view (partially in section) of my apparatus;

Figure 2 is a partial plan view of Figure 13 along the lines 11-11 of Figure 1B;

Figure 3 is a vertical section along the lines III-J11 of Figure 2;

Figure '4 is a view similar to Figure 2 but on an enlarged scale;

Figure 5 is a vertical section along the lines VV of Figure 3; and

Figure 6 is a section along the lines VI-VI of Figure 3.

Referring to Figures 1A and 1B, my apparatus comprises a long vibrating conveyor 8 which, as shown in 78,997 Patented Apr. 11, 1961 Figures 1A and 2, is in the form of an elongated hopper having a bottom 9 and sides 10. The hopper is mounted on bases 11 which in turn support links 12 which are pivotally connected to pedestals 13 on the bases and to the bottom 9 adjacent its sides. The pedestals 13 also support pneumatic springs 14 which press against seats 15 also secured to the bottom 9 of the conveyor. The conveyor is vibrated longitudinally by a conventional off-center weight 16 driven by a motor 18 through a chain sprocket drive 19 and gearing 20 and 21. Such a conveyor is conventional and, as is well known, when the conveyor is longitudinally vibrated by the off-center weight 16, material deposited at one end of the conveyor (in this case, the left-hand end, viewing Figure 1A) will be moved along the conveyor towards the other end of the conveyor.

In accordance with my invention, the size of the conveyor is determined by the quantity of refuse which is delivered to an incinerator embodying my apparatus. As material is dumped from the trucks at one end, it is moved across the conveyor over to a feeder, which will later be described. Refuse can be dumped at any time at one end of the conveyor and it will be moved across the conveyor so as to continuously supply refuse to the feeder. At the same time, the conveyor will have sufficient capacity to store all of the refuse received by an incinerator before it is passed to the feeder and by the feeder into a furnace for consumption.

Referring to Figure 1B, refuse is delivered from the right-hand end (viewing Figures 1A and 1B) of the conveyor to a feeder, designated generally by the reference number 22. The feeder then passes the refuse into a furnace, designated generally by the reference number 23, where it is burned on a pulsating grate 24 which continuously moves the refuse along its length while the refuse is burned. The resulting ashes are delivered from the end of the grate 24- onto a conveyor 25 which delivers them to trucks or to storage. Gaseous products of combustion pass out through a flue 26 to a gas scrubber Where they are cleaned before passing to atmosphere. The gas scrubber used is conventional and, therefore, is not shown or described.

Figures 3 and 4 show the feeder for delivering refuse from the conveyor to the furnace. The feeder comprises an elongated passageway, designated generally by the reference number 27, having a refuse receiving opening 28 adjacent the delivery end of the conveyor 8 and a refuse discharging opening 29 which leads to an opening 30 in an end wall 31 of the furnace 23.

The feeder also has mechanism for pushing refuse eceived from the conveyor 8 at the opening 28 through the passageway 27 and out the discharge opening 29, through the opening 30 in the furnace wall, and thence onto the grate 24. This mechanism comprises a plurality of arms 32 which, as shown in Figure 3, extend outwardly from a horizontally extending shaft 33 which extends from side to side across and above the passageway 27 and is journaled outside the passageway in suitably supported bearings 34. The shaft is rotated by mechanism hereinafter described so that the arms 32 turn with the shaft and engage refuse in the receiving opening 2:; and force it through the passageway 27.

The passageway 27 is formed by a casing having a bottom wall 35 of metal plates suitably supported and reinforced by channels 36 and angles 37. Referring to Figure 3, it will be seen that the bottom wall 35 extends in substantially a straight line from the bottom of the discharge opening 29 to a point approximately beneath the shaft 33, whereupon it curves upwardly and terminates at the point 38 beneath the end of the bottom 9 of the conveyor.

The top of the casing is also formed for a portion of asides? its length extending from the furnace of metal plate 39 which is suitably supported by a channel and the furnace wall .31.- As shown in Figure 3,.the plate .30 curves slightly. at its endnext to thefu'r'nace wall 31 and'is securedto the furnace wall31'at the top of the opening 3B. The plate 39 terminates at the ch'annel ltl -which, as appears from Figure 3; is at a point on the furnace sideof the shaft 33 just beyond the outermost reach which, as shown in Figure'3, extendfromthe-channel 49 in a straight line for a portion oftheir length and are then curved-upwardly around the shaft 33, but spaced therefrom, untilth'ey reach a point 4 2 at approximately the same elevation as the shaft 33, whereupon they are again straight and extend vertically, to a supporting angle 43 which is beyond the reach of the arms 32. The curved portions of the-channels 41 between the shaft 'frfi and the end.38of the bottom of the casing form the refuse receiving opening 28. The remainingportions of the channels 41 which extend upwardly. between the shaft 33 and the conveyor 8 form a wall or barrier so that refuse delivered by the conveyor 3 will fall into the opening 28.

As is shown in Figure 4, the channels 41 are spaced from each other across the passageway 27 so as to form slots 44 through which the arms 32 extend and through which the arms may pass as they rotate on the shaft 33.

Also, as shown in Figure 4, the channels &1 are U- shaped and are secured to the channels 40 and 43 so that their flanges extend toward the interior of the passageway 27, thus providing rails along which the garbage may move through and up the passageway 27.

The mounting and operation of the arms 32 will now be described with particular reference to Figures 3, 4, and 5. Spiders 45 mounted at each end and in the center of the shaft 33 support on the shaft a cylindrical drum 46 which rotates with the shaft 33. The arms 32 are secured to web plates 47 and these plates are welded to the periphery of the drum 46. Referring to Figures 3 and 4, it will be seen that the arms 32 are spaced from each other along the shaft 33 so that they are in line with the slots 44 and can pass through the slots upon rotation of the shaft 33. From Figure 4, it will also be noted that the arms 32 are spaced angularly from each other about the drum 33 so that they do not all pass through the refuse delivered by the conveyor 8 at the same time. This arrangement of the arms has several advantages. It provides space through which'large solid gear 50 on a gear reducer 51 driven by a motor 52. The

motor 52 thereby turns the shaft .33iand drum 46 and causes the arms 32' to rotate in the'direction-of thearrows shown in Figures 1B and 3.

Preferably, the arms 32 have the shape of an involute curve, as shown in-Figure 3, so that, as they; passthrough the slots 44 between the channels 41 to the rear (in the direction of refuse movement) of the axle 33, thereis a wiping action betweenthe flanges of the channels and the arms 32," which thereby cleans the .blades of refuse.

Preferably'also, the arms. 32 aremadeof spring steel so,-

that, if theystrike any obstruction'in-therefuse, theywar deflect and pass over the obstruction rather-than createexcessive pressure against thegcasingg Instead of being made of resilient spring steel, the arms may be 4 pivotallymbiififd on thedrum 46 and held in position by springs.

Again referring to Figure 3, it will be seen that the arms 32 pass through the vertical wall formed by the channels 41 in advance of the axle 33 and then pass downwardly through refuse delivered by the conveyor 8 and through the refuse receiving opening 28. At this point, the arms extend substantially across the opening 23'; Upon further rotation, the arms pass close to (but do not touch) the bottom plate 35 at a point beneath the axle 33 and thus extend substantially across the passageway 27-:

The passageway 27 is completed by side plates 53 which forms the sides of the'casing defining the passageway 27. As shown in Figure 3, the side plates 53 overlap the sides of the conveyor so as to insure delivery of all refuse into the opening 28. At the discharge opening 29, .a refractory-faced gate 54 is provided to close the passageway 27when desired. The gate 54 is secured at its-top to a shaft 55 which rests in bearings outside the side plates '53. A' curved plate 56 extends from the bottom of the gate '54 to a point approximately level with the shaft 55 and prevents refuse from being forcedup against the gate 54 when it is closed so that the gate can be readily opened without forcing refuse back through the passageway 27. The plate 56 carriees a rack 57 which meshes with a pinion 58 carried on a second-shaft S9. The shaft 59 and the pinion are driven by a motor 60, gear reducer 61, and chain drive 62. The motor 60 can therefore be energized to open and closethe gate 54.

Referring to Figure 1B,'it will be seen that refuse fed 7 through the passageway 27 passes out the refuse discharging opening 29' into the furnace 23. From there, it falls onto a pulsating grate 24. As illustrated in Figure 1B, the refuse will extend outwardly from the opening 30 before it falls onto the grate 24. At that point, it is ignited so that, when it falls down upon the grate 24,'it will already have been ignited and the ignited surfaces fall 'fa'ce downupon the grate 24, thus improving combustion on the grate.

The grate 24 is a stepped grate sloping downwardly from the end which receives the refuse to the end which delivers the ashes. There is an air opeing 63 in each riser of the stepped grate. so that air can be blown from beneath the grate out through the openings in the risers and into the refuse which is burning-oaths grate.

- Referring to Figure 6, it will be seen that the grate is enclosed on each side by refractory walls 64-supported by'steel plates 65 which extend vertically upwardly above the sides of the grate and then extend vertically and outwardly to the sidewalls of the furnace. Outer wall 66- which support'the roof 67 of the furnace form with the walls 64 plenum chambers '68 into which air-can be blown by. a blower 69 (see Figure 1B). The airthen passes through dampers 70 in the walls 64 beneath the V grate and out through the openings 63 The grate 24 is supported ina frame of crossbeams 71 and longitudinal beams 72 The frame, inturn, is supported on a series of leaf springs 73 anchored-at their lower ends to a base 74. A conventional vibrating mechanism 75 is mounted on the frame and causes the frame and grate tovibrate longitudinally on the springs.

The furnace is also supplied with air abovethe refuse on the grate by a blower, not shown. This air, plus-the air supplied from beneath the refuse through the risers on the stepped grate, provides substantially complete combustion of the refuse. While'the refuse is burning on the grate, vibration of the grate causes it to move along the grate continuously so that burningrefuse is received at one end and ashes are discharged at the other end The operation of my method and apparatus for con tinuously burning refuse is as follows. Refuse is de posited at: one end of the conveyor 8 It is continuously moved across the" conveyor to theZfee'der' ZZi- The'con veyor has sufficient size so that a large quantity of refuse can be dumped on it in a short period of time and the conveyor can store the refuse while moving it towards the feeder so that refuse will be continuously supplied to the feeder. Heretofore, the refuse has been received in storage pits and moved to the furnace in batches by a hoist and bucket.

The feeder receives the refuse in the refuse receiving opening 28. Rotation of the arms 32 advances the refuse through the opening 28 and through the passageway 27 to the discharge opening 39. The arms strike the refuse delivered by the conveyor 8 in" succession and thereby continuously move refuse through the opening 28 and the passageway 27. While in Figure 3 I have shown the arms 32 as preferably extending the full depth of the passageway 27 in a portion of their path of travel, I have found that it is necessary only that the arms extend a substantial distance into the passageway even though some of the refuse may be of extremely small size. That is to say, there may be a clearance of several inches between the ends of the arms and the bottom 35 of the casing. Refuse of larger size which is engaged by the arms will push before it through the passageway the small-sized refuse and wipe the sides of the passageway clean. They also fill up the passageway 27 with refuse so that the opening 30 is sealed and the correct proportion of fuel and air may be maintained in the furnace. At the same time, the refuse is not compacted to such an extent that it will be difiicult to burn when it reaches the furnace. From the passageway 27 and the discharge opening 30, the refuse falls onto the grate 24. It is, however, ignited before it strikes the grate, thus improving combustion. As has heretofore been described, the grate continuously moves refuse while burning along its length. Since it is pulsating, it continuously agitates the fuel bed and accelerates combustion.

While I have described certain presently preferred embodiments of my inventions, it is to be understood that they may be otherwise variously embodiedwithin the scope of the appended claims.

I claim:

1. Apparatus for the continuous combustion of refuse and the like comprising an elongated trough-like receptacle having its longitudinal axis extending in a generally 7 horizontal plane and means for oscillating said receptacle to move refuse stored therein towards one end of the trough, a furnace having an elongated grate for burning refuse, a feeder for delivering refuse from the end of 6 the trough towards which the refuse moves to one end of the furnace grate, said feeder comprising an elongated passageway having a refuse-receiving opening and a refuse-discharging opening and extending from the trough to a point above the grate and a plurality of arms which extend substantially the full distance between the top and bottom of the passageway and means for moving the arms through a portion of the passageway to engage refuse at the entrance of the passageway and force the refuse through the passageway through said discharging opening and onto said furnace grate and means for activating the grate to move refuse while burning towards the other end of the grate.

2. Apparatus for the continuous combustion of refuse and the like as described in claim 1, in which the discharging opening of said elongated passageway is higher than the refuse-receiving opening and above said furnace grate and in which said arms move the refuse upwardly through the passageway and out through said refusedischarging opening.

3. A method for the continuous combustion of municipal and industrial refuse and the like comprising storing the refuse and compacting the stored refuse by contin uously moving it upwardly through a passageway towards a furnace having a grate for burning refuse and a refuse discharging opening above one end of the grate, delivering said refuse through said opening to a position in the furnace above said end of said grate, temporarily maintaining the refuse in compacted form in a position above the grate and extending from said opening to expose said refuse while at said position above the grate to heat from the furnace, igniting the refuse at said position, dropping the burning refuse onto the grate, and moving the refuse while burning along the grate and towards the other end of the grate.

References Cited in the file of this patent UNITED STATES PATENTS 1,478,875 Ludwig Dec. 25, 1923 1,772,285 Knittel Aug. 5, 1930 1,782,996 Moody Nov. 25, 1930 1,840,374 Thatcher Ian. 12, 1932 2,014,796 Blumenthal et a1. Sept. 17, 1935 2,386,336 Mosshart Oct. 9, 1945 2,684,754 Bankauf et al. July 27, 1954 2,763,220 Becker et a1. Sept. 18, 1956

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