US3580195A - Grate for industrial furnaces - Google Patents

Grate for industrial furnaces Download PDF

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Publication number
US3580195A
US3580195A US811765A US3580195DA US3580195A US 3580195 A US3580195 A US 3580195A US 811765 A US811765 A US 811765A US 3580195D A US3580195D A US 3580195DA US 3580195 A US3580195 A US 3580195A
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United States
Prior art keywords
grate
axis
grate member
drum
gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US811765A
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English (en)
Inventor
Johannes Josef Martin
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Individual
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Individual
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Publication date
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Publication of US3580195A publication Critical patent/US3580195A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H7/00—Inclined or stepped grates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H11/00—Travelling-grates

Definitions

  • the present invention relates to grates, more particularly to improvements in grates used for the removal of waste material from large industrial furnaces. Still more particularly, the invention relates to improvements in grates which employ a combination of grate components at least one of which is movable to effect such removal.
  • a presently known construction embodies a fixed grate element and a movable final discharge or conveying element, there being an aperture between the two ele ments to allow clearance for the discharge element to move.
  • a disadvantage inherent in this type of grate construction is that some waste material often falls into the aperture in front of the discharge element, rather than onto the discharge element.
  • Another object of this invention is to eliminate the drawbacks of presently known grates used to remove waste material from large industrial furnaces through the use of a continuous grate of improved design and construction.
  • Another object of this invention is to provide a grate which efficiently controls the transport of waste material in large industrial furnaces.
  • the improved grate comprises a first grate member, a driven second grate member which defines a gap with the first member and a third grate member which bridges the gap between the first and second members.
  • the third grate member is movable with reference to the first and second members and abuts the second member.
  • FIGURE is a schematic sectional view of a preferred embodiment of the present invention.
  • FIG. 1 there is shown a first grate member, grate bar 1, a second grate member, discharge drum 2, which defines a gap with the first member, and a third grate member, intermediate grate bar 5 which bridges the thus formed gap.
  • Furnace frame 9 includes as a part thereof a support means for bar 5 shown by pivot 3.
  • One end of bar 5 is articulately connected to the pivot 3, which has a horizontal axis, in such a manner that bar 5 is movable in a vertical direction which is substantially normal to the axis of pivot 3.
  • the other end of bar 5 is in the form of a rounded portion 4 which abuts against the external surface of drum 2.
  • Drum 2 is driven to rotate about an axis which is substantially parallel to the axis of pivot 3 in a direction indicated by the arrow by means of shaft 10 which is coupled to a not shown prime mover.
  • the external surface of drum 2 comprises a series of projections or ripples 8.
  • end portion 4 of bar 5 bears against the surface of drum 2 at a point above the axis of drum 2 by reason of the weight of bar 5.
  • Bar 5 follows the contour formed by ripples 8 in a manner analogous to that of the movement of a cam and follower.
  • ripples 8 on drum 2 impart periodic motion to bar 5 causing it to move in an oscillatory manner about pivot 3 while it remains in constant sliding contact with the surface of drum 2 in the region where such surface travels upwardly.
  • This arrangement of intermediate bar 5 between grate bar 1 and drum 2 forms a continuous path for the transfer of waste material practically without apertures or spaces between these components.
  • a significant advantage of this construction is that by eliminating the gaps between the components, the waste material such as ashes, cinders, slag or scale can be transferred in a more efficient manner than has been possible with presently known grate constructions. This is because whatever clearances may still exist between the individual components do not allow an appreciable amount of waste material to passthrough. It is possible to further reduce the likelihood of material loss between the grate members 1 and 2 by adding a biasing means to control the contact pressure of bar 5 against the peripheral surface of drum 2. For example,
  • the biasing means can include a connecting member 6 which is pivotally connected to bar 5 as shown at 60, while the other end is resiliently .mounted to frame 9 by means of an adjustable spring means 7.
  • the tension of member 7 acting upon bar can be increased or decreased, thereby varying the contact pressure of bar 5 against drum 2 in addition to or detraction from the already existing contact pressure which results from the weight of bar 5.
  • the waste material is efficiently transported to a predetermined location to the right of drum 2 in the FIGURE.
  • the novel intermediate grate bar 5 does not interfere with the rotation of drum 2, despite the fact that bar 5 bridges the gap between grate members 1 and 2.
  • Rotation of drum 2 can be utilized to impart periodic motion to bar 5 and thereby aid in the efficient transfer of material from bar 1 to drum 2.
  • a grate particularly for use in large industrial furnaces, comprising a first grate member; a driven second grate member having an axis and a surface about said axis and being rotatable in one direction about said axis, said second grate member defining a gap with said first grate member; a third grate member bridging the gap between said first and second members, said third grate member being movable with reference to said first and second members and abutting said surface of said second member during rotation of the latter about its axis.
  • a grate as defined in claim 1, wherein said rotatable second grate member comprises a drum rotatable about a substantially horizontal axis, said third grate member abutting with one end thereof against the peripheral surface of said drum and being mounted at the other end thereof for pivotal movement about an axis substantially parallel to said drum axis.
  • a grate as defined in claim 2 further comprising support means for said third grate member.
  • a grate as defined in claim 2 further comprising means for imparting periodic motion to said third grate member.
  • a grate as defined in claim 8, wherein said means for imparting periodic motion to said third grate member comprises projections on the external surface of said second grate member.
  • a grate particularly for use in large industrial furnaces, comprising a first grate member; a driven second grate member defining 'a gap with said first member; a third grate member bridging the gap between said first and second members, said third grate member being movable with reference to said first and second members and abutting against said second member; and biassing means for urging said third grate member against said second grate member.
  • a grate as defined in claim 10, wherein said biasing means comprises a-connecting member secured to said third grate member, a frame, and resilient means operating between said frame and said connecting member to urge said third member against said second member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Incineration Of Waste (AREA)
US811765A 1968-04-06 1969-04-01 Grate for industrial furnaces Expired - Lifetime US3580195A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681751126 DE1751126A1 (de) 1968-04-06 1968-04-06 Rost fuer Grossfeuerungen

Publications (1)

Publication Number Publication Date
US3580195A true US3580195A (en) 1971-05-25

Family

ID=5692140

Family Applications (1)

Application Number Title Priority Date Filing Date
US811765A Expired - Lifetime US3580195A (en) 1968-04-06 1969-04-01 Grate for industrial furnaces

Country Status (5)

Country Link
US (1) US3580195A (de)
AT (1) AT293587B (de)
DE (1) DE1751126A1 (de)
FR (1) FR2005682A1 (de)
GB (1) GB1189290A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2930406A1 (de) * 1979-07-26 1981-02-12 Krupp Polysius Ag Schubrost
DE3263556D1 (en) * 1981-10-16 1985-06-20 Coal Industry Patents Ltd Grate assembly in solid fuel combustion equipments

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1804638A (en) * 1925-05-22 1931-05-12 Westinghouse Electric & Mfg Co Actuating means for fuel agitators
US3469544A (en) * 1967-05-23 1969-09-30 Ver Kesselwerke Ag Incinerator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1804638A (en) * 1925-05-22 1931-05-12 Westinghouse Electric & Mfg Co Actuating means for fuel agitators
US3469544A (en) * 1967-05-23 1969-09-30 Ver Kesselwerke Ag Incinerator

Also Published As

Publication number Publication date
FR2005682A1 (de) 1969-12-12
GB1189290A (en) 1970-04-22
AT293587B (de) 1971-10-11
DE1751126A1 (de) 1971-05-06

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