WO1995033958A1 - Grate for a furnace, particularly an infeed grate for a refuse incinerator - Google Patents
Grate for a furnace, particularly an infeed grate for a refuse incinerator Download PDFInfo
- Publication number
- WO1995033958A1 WO1995033958A1 PCT/DK1995/000231 DK9500231W WO9533958A1 WO 1995033958 A1 WO1995033958 A1 WO 1995033958A1 DK 9500231 W DK9500231 W DK 9500231W WO 9533958 A1 WO9533958 A1 WO 9533958A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grate
- beams
- shaft
- grate beams
- infeed
- Prior art date
Links
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
- F23H7/06—Inclined or stepped grates with movable bars disposed parallel to direction of fuel feeding
- F23H7/08—Inclined or stepped grates with movable bars disposed parallel to direction of fuel feeding reciprocating along their axes
Definitions
- the present invention relates to a grate for a furnace, particularly an infeed grate for a refuse incinerator, said grate being of the kind referred to in the pre-char- acterizing part of claim 1.
- the motive mechanism consists of a single shaft disposed beneath the grate beams and transversely to their longitudinal direction, said shaft being restric ⁇ tedly rotatable back and forth by means of a rack-and- pinion mechanism, the rack of which is reciprocated by a fluid-operated piston-cylinder mechanism and the pinion of which is secured to the shaft.
- pinions are provided engaging with superjacent racks secured to the lower side of each of these grate beams, and below each of the second set of grate beams the shaft has pinions engaging with subjacent racks disposed in a box-like structure secured to the lower side of each of these grate beams.
- Rack-and-pinion mechanisms are expensive to manufacture and moreover, in the use herein referred to, extremely subject to malfunctions. As there must, necessarily, be a clearance between the sides of the grate surfaces in mutual opposite reciprocation on the adjacent grate beams, ash and slag or unburned particles, e.g.
- refuse parts will unavoidably fall down through such clearances and may be deposited on the motive mechanism beneath the grate, especially on the subjacent racks, and thereby impede its functioning and cause wear on it or perhaps even destroy it, this being the more disadvantageous, since this motive mechanism of the known grate is not easily accessible for cleaning, replacement of worn parts or more extensive repairs.
- Applicants' US-A-4,494,469 discloses another grate of the kind referred to for an incinerator, in which only one set of grate beams are reciprocated in their longitudinal direction, whereas the second set of grate beams are stationary.
- the motive mechanism consists of a single shaft disposed below the grate beams transversely to their longitudinal direction, said shaft via a crank arm being restrictedly rotatable back and forth by a hydraulic piston-cylinder unit.
- the shaft has radially protruding drivers engaging with recesses in the lower side of these grate beams and on rotation back and forth of the shaft, said drivers implying a reciprocating move ⁇ ment to the beams.
- This motive mechanism is simple and insensitive to solid combustion products or fuel particles falling down through the clearances between the grate blocks on the stationary and movable grate beams, since the region of engagement between the latter and the dri ⁇ vers lies well protected against such falling through of residues in the lower sides of the grate beams.
- the motive mechanism of the grate is also constructed as stated in claim 2, making it possible to control the guantity conveyed on an infeed grate as well as the disintegration of refuse on such grate.
- the grate is constructed as stated in claim 3, thereby a- chieving a more reliable removal of fuel and a stronger disintegration and spreading of the refuse, respectively, when the grate blocks on adjacent grate beams in the uppermost area of the grate at the same time rise during their movement towards and away from each other, respec ⁇ tively.
- the grate according to the invention is placed as stated in claim 4.
- Figure 1 is a side view, partly in section, of a grate beam of the first set of grate beams with a number of grate blocks supported on the beams,
- Figure 2 in perspective shows a grate block disposed at the end of a grate beam
- Figure 3 in broken sections A and B shows the mechanism for reciprocating movement of a grate beam of the first set and of the second set, respectively, in the longitu ⁇ dinal direction
- Figure 4 is an elevation of the mechanism for restricted rotation back and forth of the first and the second shaft, respectively.
- Figure 5 is a vertical sectional view substantially along the line V-V in Figure 3 through the infeed grate accord ⁇ ing to the invention between the first and second shaft and showing the drivers secured to the latter engaging in recesses in the lower side of the second set of grate beams.
- Figure 1 shows five grate blocks 1 secured to cross mem- bers 12 of a grate beam 2 of the first set of grate beams.
- the grate beam 2 comprises in its lower side a recess 15 adapted to engage with a driver, as will be explained later.
- the grate blocks 1 overlap each other, the front part of an upper grate block 1 protruding over the rear part of the succeeding grate block 1 in the row.
- Each of the grate blocks 1 comprises two substantially horizontal surfaces 4 disposed at a distance from each other and two downwardly inclined surfaces 5, so that the upper side of the row of grate blocks 1 extends like a regular flight of stairs.
- the surfaces 5 could extend at right angles to the surfaces 4, i.e.
- the uppermost grate block 1 comprises a hook-like projection 6 protruding upwardly from the rear part of the upper surface 4, and serving as air seal (cf. Figure 3) .
- the grate beams 3 of the second set of grate beams are constructed in the same manner as the grate beam 2 shown, and the grate blocks 1 are located thereon in the same manner, but the grate beams 3 differ from the grate beam 2 shown in that the engagement recess 18 ( Figure 3) in their lower sides are located a distance from the upper end of the grate beams 3, as will be explained later.
- FIG. 2 is a perspective view of a grate block 1 placed at the lower end of a grate beam 2 or 3.
- the grate block 1 consists of two mutually spaced, parallel side members 7 interconnected by means of tie rods 8 on which a number of grate bars 9 are supported, the latter mutually de- fining passages 10 for air.
- continuous grate surfaces may be supported on the tie rods, this being particu- larly preferred as regards grate blocks in infeed grates in refuse incinerators that are located close to the upper ends of the grate beams 2 and 3, whereas the lower grate blocks 1 on the grate beams are constructed as shown in Figure 2 with a view to supplying primary co - bustion air to the ignited refuse on these grate blocks.
- the grate beams 2 and 3 likewise consist of two parallel, vertical and mutually spaced side stringers 11 rigidly interconnected by means of e.g. welded-on cross members 12 also serving to secure the grate blocks 1.
- the broken section A shows the motive mecha ⁇ nism making a grate beam 2 of the first set of grate beams reciprocate in its longitudinal direction
- the broken section B shows the motive mechanism causing a corresponding reciprocation of a grate beam 3 of the second set of grate beams.
- the grate beams 2 and 3 respectively, are shown in the same phase of their movements, viz. in their uppermost positions, but it will be understood that when the grate beam 2 is in the uppermost position shown, the grate beam 3 will be in its opposite, lowermost position.
- the motive mechanism comprises a shaft 13 capable of limited back-and-forth rotation, on which an outwardly protruding driver 14 is fastened, said driver engaging the recess 15 in the lower side of the grate beam 2 and, when the shaft 13 rotates back and forth, makes the grate beam 2 reciprocate in its longi ⁇ tudinal direction.
- the motive mechanism shown in the broken section B comprises a shaft 16 capable of limited back-and-forth rotation, on which an outwardly protruding driver 17 is fastened, said driver engaging the recess 18 in the lower side of the grate beam 3 and, when the shaft 16 rotates back and forth, reciprocates the grate beam 3 in its longitudinal direction.
- the shafts 13 and 16 rotate back and forth in opposite phase. This does not appear from Figure 3, in which the grate beams 2 and 3, as mentioned, are shown in the same phase of their movement.
- FIG 4 shows the motive mechanism for limited back- and-forth rotation of the shafts 13 and 16.
- This motive mechanism comprises a fluid-driven, preferably hydrauli- cally driven, piston-cylinder unit 19, the cylinder of which as shown at 20 is pivotably secured to a bracket 21 mounted on the lower structure of the infeed grate, and the piston rod of which, as shown at 22, is linked at its end to one arm of a two-armed lever 23 being secured to a protruding end of the shaft 13.
- the other arm of the two-armed lever 23 is as shown at 24 linked to one end of a link rod 25.
- the other end of the link rod 25 is, as shown at 26, linked to a one-armed lever 27 secured to a protruding end of the shaft 16.
- Figure 5 is a vertical sectional view, mainly along the line V-V in Figure 3, through the infeed grate according to the invention and showing grate blocks 1 secured to the grate beams 2 and 3 and the shaft 16 being rotated back and forth by the one-armed lever 27 and being equipped with the upwardly protruding drivers 17 engaging the recesses in the lower sides of the grate beams 3.
- Reference numeral 28 designates walls in the combustion furnace (not shown) of the incinerator, while 29 indicates the lower structure (not shown) of the infeed grate according to the invention.
- the infeed grate according to the invention is solely mentioned in connection with infeed of refuse in an incinerator, but as will be evi ⁇ dent, it can equally well be used for infeeding other fuels, such as e.g. solid fossil fuels or a mixture of refuse and solid fossil fuel in the incinerator, if the latter's operating conditions make this desirable or necessary. Also other types of fuel, e.g. wood chippings, can be feed into the incinerator, either alone or together with refuse by means of the infeed grate according to the invention.
- fuels such as e.g. solid fossil fuels or a mixture of refuse and solid fossil fuel in the incinerator, if the latter's operating conditions make this desirable or necessary.
- other types of fuel e.g. wood chippings, can be feed into the incinerator, either alone or together with refuse by means of the infeed grate according to the invention.
- grates according to the invention can be used as downstream grate sections in an incinerator of the type, in which only advancing and rear ⁇ ranging of the fuel on the grates take place.
Landscapes
- Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50019596A JP3609418B2 (en) | 1994-06-08 | 1995-06-08 | Furnace grate, especially feed grate for waste incinerator |
DE69504503T DE69504503T2 (en) | 1994-06-08 | 1995-06-08 | OVEN GRATE, IN PARTICULAR FEED RATE FOR A WASTE COMBUSTION PLANT |
AU26699/95A AU2669995A (en) | 1994-06-08 | 1995-06-08 | Grate for a furnace, particularly an infeed grate for a refuse incinerator |
EP95921732A EP0763180B1 (en) | 1994-06-08 | 1995-06-08 | Grate for a furnace, particularly an infeed grate for a refuse incinerator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK064794A DK170493B1 (en) | 1994-06-08 | 1994-06-08 | Grate for an incinerator, in particular a grate for a waste incinerator |
DK0647/94 | 1994-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995033958A1 true WO1995033958A1 (en) | 1995-12-14 |
Family
ID=8095964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1995/000231 WO1995033958A1 (en) | 1994-06-08 | 1995-06-08 | Grate for a furnace, particularly an infeed grate for a refuse incinerator |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0763180B1 (en) |
JP (1) | JP3609418B2 (en) |
AT (1) | ATE170611T1 (en) |
AU (1) | AU2669995A (en) |
DE (1) | DE69504503T2 (en) |
DK (1) | DK170493B1 (en) |
WO (1) | WO1995033958A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US795388A (en) * | 1904-07-27 | 1905-07-25 | Charles Edgar Googins | Reciprocating terraced furnace-grate. |
US2695575A (en) * | 1952-07-28 | 1954-11-30 | Leslie F Gough | Reciprocal grate for boilers and other heating units |
US4471704A (en) * | 1982-06-21 | 1984-09-18 | Clear Air, Inc. | Reciprocating grate systems for furnaces and incinerators |
US4494469A (en) * | 1982-05-13 | 1985-01-22 | Volund Miljoteknik A/S | Stepped grate for an incinerator plant |
-
1994
- 1994-06-08 DK DK064794A patent/DK170493B1/en not_active IP Right Cessation
-
1995
- 1995-06-08 AU AU26699/95A patent/AU2669995A/en not_active Abandoned
- 1995-06-08 AT AT95921732T patent/ATE170611T1/en not_active IP Right Cessation
- 1995-06-08 WO PCT/DK1995/000231 patent/WO1995033958A1/en active IP Right Grant
- 1995-06-08 DE DE69504503T patent/DE69504503T2/en not_active Expired - Fee Related
- 1995-06-08 EP EP95921732A patent/EP0763180B1/en not_active Expired - Lifetime
- 1995-06-08 JP JP50019596A patent/JP3609418B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US795388A (en) * | 1904-07-27 | 1905-07-25 | Charles Edgar Googins | Reciprocating terraced furnace-grate. |
US2695575A (en) * | 1952-07-28 | 1954-11-30 | Leslie F Gough | Reciprocal grate for boilers and other heating units |
US4494469A (en) * | 1982-05-13 | 1985-01-22 | Volund Miljoteknik A/S | Stepped grate for an incinerator plant |
US4471704A (en) * | 1982-06-21 | 1984-09-18 | Clear Air, Inc. | Reciprocating grate systems for furnaces and incinerators |
Also Published As
Publication number | Publication date |
---|---|
DK170493B1 (en) | 1995-09-25 |
EP0763180B1 (en) | 1998-09-02 |
DE69504503D1 (en) | 1998-10-08 |
JP3609418B2 (en) | 2005-01-12 |
AU2669995A (en) | 1996-01-04 |
JPH10501054A (en) | 1998-01-27 |
EP0763180A1 (en) | 1997-03-19 |
ATE170611T1 (en) | 1998-09-15 |
DE69504503T2 (en) | 1999-01-28 |
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