EP0087339B1 - Wanderroste welche den Herd eines Ofens oder eines Wirbelbettreaktors bilden - Google Patents

Wanderroste welche den Herd eines Ofens oder eines Wirbelbettreaktors bilden Download PDF

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Publication number
EP0087339B1
EP0087339B1 EP83400241A EP83400241A EP0087339B1 EP 0087339 B1 EP0087339 B1 EP 0087339B1 EP 83400241 A EP83400241 A EP 83400241A EP 83400241 A EP83400241 A EP 83400241A EP 0087339 B1 EP0087339 B1 EP 0087339B1
Authority
EP
European Patent Office
Prior art keywords
links
caps
bars
filling
grate
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
Application number
EP83400241A
Other languages
English (en)
French (fr)
Other versions
EP0087339A3 (en
EP0087339A2 (de
Inventor
Jacques Fourey
Gustave Logez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Cail Babcock SA
Original Assignee
Fives Cail Babcock SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fives Cail Babcock SA filed Critical Fives Cail Babcock SA
Priority to AT83400241T priority Critical patent/ATE32256T1/de
Publication of EP0087339A2 publication Critical patent/EP0087339A2/de
Publication of EP0087339A3 publication Critical patent/EP0087339A3/fr
Application granted granted Critical
Publication of EP0087339B1 publication Critical patent/EP0087339B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H11/00—Travelling-grates
    • F23H11/18—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H11/00—Travelling-grates
    • F23H11/02—Travelling-grates with the bars disposed on transverse bearers

Definitions

  • the present invention relates to improvements to the grids of the type forming an endless belt stretched between two rotary drums and the upper strand of which constitutes the hearth of a hearth or of a fluidized bed reactor supplied with air or reaction gas with across said strand.
  • These grids are formed by bars articulated on axes in the manner of the links of a chain.
  • the known grids include bars of different types: edge bars on the two sides of the grid, drive bars framing the rollers mounted on the articulation axes and by which the grid receives its movement from the drum motor, and bars of filling. All these bars have a blade-shaped body, arranged vertically and a cap whose width is greater than the thickness of the body and which extends either on one side, for the edge and drive bars, or symmetrically of on either side of the body, for the filling bars.
  • the edge, drive and filling bars have different transverse dimensions, which complicates the manufacture of the grid and obviously makes it more expensive.
  • the dimensions of the edge and drive bars are in fact imposed by their function, namely: ensuring sealing with the side walls of the hearth or of the reactor and protecting the ends of the axes of articulation, for the former, and protecting the drive rollers for the latter.
  • the dimensions of the filling bars are chosen to allow the passage of a predetermined gas flow through the grid with an acceptable pressure drop and to prevent the fall of small particles of the product constituting the fluidized bed between the bars.
  • the spacing between the bars is fixed by bosses formed on the bars around the bores receiving the hinge pins and which are in abutment against each other, the support plane of each of these bosses being away from the corresponding edge of the cap, which complicates the machining of the bars.
  • the object of the present invention is to simplify the manufacture of the bars and the grid and to reduce the cost of the latter without reducing its performance.
  • the grid object of the present invention is characterized in that the width of the caps of the filling bars is substantially equal to that of the edge and driving bars and in that the top of the caps is rounded or bevelled to allow a setting complete suspension of the products constituting the fluidized bed and their edges are thinned to reduce the pressure drop of the gas stream when passing through the grid.
  • the aim sought is quite different: it is a question of satisfying the conditions imposed on any fluidized bed support grid, that is to say of avoiding the fall of particles between the bars in retaining acceptable pressure drops, despite the larger width of the caps than on conventional grids.
  • the top of the caps can be formed by convex curved surfaces and / or inclined planes having a sufficient slope for the particles which fall on the bars to slide to the edges of the caps where they meet the current of fluidizing gas circulating between the bars and are entrained by it in the fluidized bed.
  • the top of the hats may have horizontal or gently sloping surfaces, but they must be sufficiently narrow so that the particles cannot be kept there in stable equilibrium.
  • the top of the caps consists of two symmetrical inclined planes arranged in the manner of two inclinations of a roof, the top of which can be at a sharp angle, rounded or truncated.
  • the caps of the bars have raised parts forming slots or saw teeth to allow better entrainment of the ash and bottom ash, especially when the upper strand of the grid is inclined.
  • the grid partially shown in Figures 1 and 2 is formed of bars assembled in the manner of the links of a chain by means of horizontal axes 10, the successive rows of bars being offset longitudinally by a half-bar.
  • edge bars 12 on each of its sides, drive bars 14 framing the rollers 16 mounted on the axes 10 and by means of which the grid receives its movement from a drum or from motor cakes, and filling bars 18.
  • All bars have the same length. They comprise a body 20, in the form of a blade, arranged vertically and pierced with two holes 22 for the passage of the axes 10 and a cap 24 surmounting said body.
  • the width of the cap is greater than the thickness of the body and is substantially the same for all the bars.
  • the cap is placed asymmetrically, on one side of the body, in the edge and drive bars ( Figures 4 and 6) and symmetrically with respect to the body in the filling bars ( Figure 8).
  • Each cap 24 has, above the hinge pins 10, two raised parts 24 ', forming slots.
  • the top of the bars could be profiled as a sawtooth, as shown in FIG. 9.
  • the top of the bars can also be straight, without teeth or teeth.
  • each part of the hat is constituted by a narrow central band 26 and two lateral bands 28, wider and inclined in the manner of the inclinations of a roof.
  • top of the bars hat could, for example, give it the shape of a roof with a sharp angle apex (figure 10) or a rounded shape (figure 11).
  • one of the edges of the cap is in the plane of the adjacent face of the body of the bar.
  • the other face of the body is provided with two stiffening ribs 30.
  • this other face is provided, around the bores 22 for the passage of the axes 10, with bosses 32 whose faces perpendicular to these axes serve as lateral support for the rollers 16.
  • the filling bars comprise, around the bores 22 for the passage of the axes 10, circular bosses 34 whose faces perpendicular to these axes are located in planes resting on the respective edges of the caps.
  • the spacing between the bars is fixed by washers 36 mounted on the axes 10. It is adjusted to allow the passage through the grid of the air flow or of another gas necessary for fluidization and possibly for maintenance. of the reaction and avoid the fall between the bars of small particles of the fluidized product.
  • These conditions can be respected, by keeping the pressure losses at the crossing of the grid at acceptable values, thanks to the particular shape of the bars, in particular because the thickness of the edges of the caps which define between them the slots where circulates the gas flow is relatively small, as can be seen in FIG. 2. This thickness is of the order of 20% of the width of the cap and may even be less.
  • the width of the bars caps can vary from 10 mm to 40 mm and the ratio of the spacing between bars, at the edges of the caps, to the width of the latter is between 5/100 and 15/100.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (7)

1. Wanderrost, welches den Herd eines Wirbelbettofens oder -reaktors bildet, bestehend aus Stäben, die Kettengliedartig gelenkig auf horizontalen Achsen (10) befestigt sind und Randstäbe (12), Mitnehmerstäbe (14) und Füllstäbe (18) umfassen, wobei jeder Stab aus einem vertikal angeordneten blattförmigen Körper (20) und einer Kappe (24) besteht, deren Breite grösser ist als die Dicke des Körpers, dadurch gekennzeichnet, dass die Breite der Kappen (24) der Füllstäbe (18) etwa gleich derjenigen der Randstäbe (12) und der Mitnehmerstäbe (14) ist, und dass die Oberseite der Kappen (24) abgerundet oder abgeschrägt ist, um eine korrekte Suspendierung der das Wirbelbett bildenden Stoffe zu erlauben, und dass sich ihre Kanten verjüngen, um die von einem durch das Rost strömenden Gasstrom erlittenen Druckverluste zu verringern.
2. Rost gemäss Anspruch 1, dadurch gekennzeichnet, dass die Oberseite der Kappen (24) von konvex gewölten Flächen und/oder schrägen Ebenen mit genügend grosser Neigung gebildet wird, damit die auf die Stäbe fallenden Teilchen bis zum Rand der Kappen gleiten.
3. Rost gemäss Anspruch 1 oder 2, dadurch gekennzeichnet, dass die obere Fläche der Kappen (24) von einem schmalen mittleren Streifen (26) und zwei breiteren, dachschrägenartig geneigten Seitenstreifen (28) gebildet ist.
4. Rost gemäss Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass eine der Kanten der Kappen (24) der Randstäbe (12) und der Mitnehmerstäbe (14) in der Ebene der angrenzenden Seite des Körpers (20) der Stäbe liegt.
5. Rost gemäss Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, dass die Füllstäbe (18) auf den gegenüberliegenden Seiten ihres Körpers (20) mit Vorsprüngen (34) versehen sind, deren senkrecht zu den Gelenkachsen (10) liegende Seite in einer sich an er entsprechenden Kante der Kappen (24) der Stäbe anlehnenden Ebene angeordnet ist.
6. Rost gemäss Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Abstand zwischen den Stäben durch auf die Gelenkachsen (10) montierte Scheiben bestimmt wird.
7. Rost gemäss irgendeinem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Kappen (24) der Stäbe zacken- oder sägezahnförmige überhöhte Abschnitte (24') aufweisen.
EP83400241A 1982-02-24 1983-02-04 Wanderroste welche den Herd eines Ofens oder eines Wirbelbettreaktors bilden Expired EP0087339B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400241T ATE32256T1 (de) 1982-02-24 1983-02-04 Wanderroste welche den herd eines ofens oder eines wirbelbettreaktors bilden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8203003 1982-02-24
FR8203003A FR2522116B1 (fr) 1982-02-24 1982-02-24 Perfectionnements aux grilles sans fin constituant la sole d'un foyer ou d'un reacteur a lit fluidise

Publications (3)

Publication Number Publication Date
EP0087339A2 EP0087339A2 (de) 1983-08-31
EP0087339A3 EP0087339A3 (en) 1985-08-28
EP0087339B1 true EP0087339B1 (de) 1988-01-27

Family

ID=9271282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400241A Expired EP0087339B1 (de) 1982-02-24 1983-02-04 Wanderroste welche den Herd eines Ofens oder eines Wirbelbettreaktors bilden

Country Status (5)

Country Link
EP (1) EP0087339B1 (de)
AT (1) ATE32256T1 (de)
DE (1) DE3375504D1 (de)
FR (1) FR2522116B1 (de)
IN (1) IN156320B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10030870B2 (en) * 2012-09-05 2018-07-24 Zeki Arikan Pellet boiler with removable grate

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1573816A (en) * 1921-08-18 1926-02-23 William M Duncan Chain grate
US1714577A (en) * 1925-01-28 1929-05-28 Combustion Eng Corp Chain grate
US1613316A (en) * 1925-05-16 1927-01-04 William M Duncan Chain grate
US1756020A (en) * 1928-04-02 1930-04-29 William M Duncan Chain grate
FR759504A (fr) * 1932-10-28 1934-02-05 Soc Fr Constr Babcock & Wilcox Grille de foyer
FR782476A (fr) * 1934-02-27 1935-06-05 Babcock & Wilcox France Grille mécanique à chaîne sans fin et ses éléments constitutifs
FR803097A (fr) * 1934-03-31 1936-09-22 Babcock & Wilcox France Foyer à grille mécanique à chaîne sans fin et ses éléments constitutifs
FR1092540A (fr) * 1953-10-29 1955-04-22 Cie Ind De Procedes Et D Appli Perfectionnements aux procédés de réalisation de réactions chimiques en phase fluidisée et dispositif pour leur mise en oeuvre
FR1263415A (fr) * 1960-04-30 1961-06-09 Babcock & Wilcox France Perfectionnements aux grilles mécaniques de combustion à chaîne sans fin

Also Published As

Publication number Publication date
IN156320B (de) 1985-06-22
EP0087339A3 (en) 1985-08-28
DE3375504D1 (en) 1988-03-03
FR2522116B1 (fr) 1987-04-30
FR2522116A1 (fr) 1983-08-26
ATE32256T1 (de) 1988-02-15
EP0087339A2 (de) 1983-08-31

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