FR2628185A1 - Rotating hearth incinerator - has under hearth ash hoppers and water-sealed ash outlets as well as annular water seal below chamber wall - Google Patents

Abstract

The enclosed incinerator has a base (27), a roof (2) with cylindrical sidewall (3). The hearth comprises a rotating grille (4) below which are integral ash hoppers (5) with surrounding hopper (6) to collect ash which falls over the edge (25) of the grille. The outlets (8,9) of the ash hoppers are submerged in a water trough (10) with an outwardly-inclined base (11). A scraper (21) sweeps the ash into the ash box (20). An annular trough (17) fixed to the outer ash hoppers receives an extension seal (18) from the cylindrical wall (3). ADVANTAGE - Incinerator is pref. sealed and ingress of excess air is prevented even during ash evacuation.

Description

Q9 FRENCH REPUBLIC Publication no .: 2,628,185 (use only

  for NATIONAL INSTITUTE. reproduction orders) FROM THE PROPERTY (= TI INDUSTRIELLE.cu DE LA PROPRIÉTÉ INDUSTRIELLE N national registration: 88 02543 PARIS

  - Int CI ': F23G 5/26, 5/44; F23J 1/00; F23L 1/02.

@ A1 PATENT APPLICATION

  Filing date: March 1, 1988. Q Applicant (s): T.E.S. S.A. - FR.

() Priority:

Q Inventor (s): Claude Maille.

  Date of public availability of the

  application: BOPI "Patents" n 36 of September 8, 1989.

  _ References to other national documents appearing

rentés: rn Holder (s)

  Q Agent (s): Novapat-Cabinet Chereau.

(Rotating hearth incinerator.

  The present invention relates to a rotary hearth incinerator comprising an automatic discharge system for the portion of ash falling through the hearth, which system is sealed to eliminate any infiltration of parasitic air thereby allowing controlled combustion. l The ash release system falling through 4

  of the sole 4 has two annular rows of hoppers 5 and ...

  6 arranged below the hearth 4, hoppers whose lower parts 8 and 9 are submerged in water contained 'i in an annular trough 10 arranged coaxially in-', "below the rows of hoppers 5 and 6. In this way the 1 5

  ash falling through the hearth 4 is brought directly-

  ment in this annular trough which includes an automatic ash clearance system 27. The outer edge 30 of the hopper system is connected to the cylindrical part 3 of the upper building of the incinerator in a sealed manner

o by means of a hydraulic seal 17.

  The advantages of the incinerator according to the present invention are the automatic release of the part of ash which falls through the hearth 4 and the perfect sealing of the lower structure of the incinerator which makes it possible to eliminate

  any infiltration of parasitic air.

  Sale of flyers at IMPRIMERIE NATIONALE, 27, rue de l Convention 75732 PARIS CEDEX 15 L D Sale of flyers at rl'MPRIMERiE NATiONALE. 27, rue de la Convention-- 75732 PARIS CEDEX 15 1. The present invention relates to an incinerator

  having a combustion chamber limited to its end

  lower part by a rotating floor consisting of a

  that rotary on which objects are incinerated-

  rer, this disc being perforated by a plurality of openings used for the supply of combustion air and at least one hopper located below and integral with the rotating hearth and extending substantially over the entire surface rotating floor to receive the ashes or

  other objects falling below said sole.

  Are known such incinerators commonly de-

  called rotary hearth incinerators in which hoppers have been arranged below the hearth to receive a part of the ash falling through the openings of the hearth, openings which serve to supply

  the air in the combustion chamber. These hoppers consist of

  normally try at their lower end of drawers 2.

  ash which must be emptied manually to degas

  manage this part of the ash which, until now, has

cannot be removed otherwise.

  There is another disadvantage of this information system.

  that the entire ash release system falling through the hearth, consisting of the above-mentioned hoppers, is not sealed and therefore the supply of air into the combustion chamber cannot be exactly controlled, and it is common that the volume of air entering the combustion chamber through leaks from the hopper system is in the same order of magnitude as the volume of air introduced by the supply system d combustion air. In this way

  the total volume of air entering the combustion chamber

  tion is almost twice as big. This excess

  combustion air decreases the temperature

  combustion which increases the risk of leaving

  part of the gases generated during combustion are burned,

  unburnt gases producing environmental pollution

  is lying. It is therefore an object of the present invention to

  provide an incinerator in which the release of the

  tie of ash falling through the openings of the hearth are automatically released to make such

  independent system of frequent human intervention.

  Another object of the present invention is to construct an incinerator whose release system

  ash falling through the hearth is perfectly watertight

  che to avoid the introduction of excess air into the

  combustion chamber due to the lack of tightness of the components

  sants arranged below the sole.

  The first of these objects is reached with an in-

  aerator as described above which is characterized in that the hoppers have open lower ends, an annular trough, comprising an automatic ash release system, being arranged 3.

  below these open ends so as to receive

  see ash or other objects falling through and

  around the sole during combustion.

  According to a preferred embodiment of the present invention, the annular trough is filled with water into which the ash falls. The hoppers have strangled lower parts which are submerged

  in the water of the annular trough, such as the opening

  of these hoppers are made perfectly sealed

  against introducing air to this part of the inci-

  nerator. To facilitate the release of ash fallen into the annular trough, through the rotating hearth and the hoppers, the annular trough has a bottom inclined towards

  the outside so as to allow the sliding of the cen-

  radially outward from this annular trough.

  To assist the sliding of this ash outwards

  laughing, and also to push the ash accumulated in an ash pan arranged at any position on

  the periphery of the annular trough, one or more doctor blades

  your are fixed on the lower parts of the hoppers

  in an orientation parallel to the inclined bottom surface

  born of the annular trough. In this way, during the rota-

  tion of the rotary hearth, the ash disposed on the inclined bottom of the annular trough is pushed into the bin

to ash.

  According to a particular embodiment of the

  present invention, the hopper system arranged below

  under the rotating floor comprises a first series of

  central hoppers arranged concentrically

  tower of a support column, sole, central hoppers

  guiding the ash falling through openings in the hearth in the annular trough. A second series of peripheral hoppers is arranged below the outer edge of the sole to receive any ash or 4. other objects which fall between the edge of the sole and

  a cylindrical wall which limits the combustion chamber.

  The combustion chamber is limited by a

  girdle comprising a canopy, a cylindrical wall and the rotating floor, this enclosure constituting a cylindrical chamber whose ceiling is formed by said voGte

  the bottom being constituted by the rotating floor.

  To make the peripheral part of the system

  hoppers sealed against parasitic air infiltration

  re, the cylindrical wall has a lower edge which is hermetically linked with the outer edge of the series of peripheral hopper by a hydraulic seal, this seal

  hydraulic consisting of a solid annular channel

  to seal the exterior parts of the enclosure

  seems of peripheral hoppers. This annular channel is filled with water in which the lower edge is submerged

of the cylindrical wall.

  Conventionally, the combustion chamber comprises

  carries a stationary blade which is oriented parallel to the surface of the rotary hearth, in an oblique direction with respect to the radial direction of the hearth, so as to cause the release of the ash disposed on the

  sole when the latter is rotated.

  Also, conventionally, the vault of the combustion chamber includes a loading hopper and

  a sliding door having a sealing system.

  We will now describe the present in-

  vention in more detail with reference to the drawings whose

  Figure 1: shows a vertical section through

  to an incinerator according to the present

the invention; the

  Figure 2: is a horizontal section of the incinerated

  rator according to Figure 1, the parts arranged below the rotating hearth are illustrated in 5. lines and dotted lines; and the

  Figure 3: shows schematically the release -

  of ash from the rotating hearth.

  In FIG. 1, the assembly of an incinerator according to the present invention has been illustrated, including a lower part 27, including any operational component of the incinerator and an upper part constituted by the vessel 2 and the cylindrical wall 3. The voate 2 includes

  a loading hopper 22 which can be closed by a door

  sliding door 23, provided with a sealing system not shown. Below the roof 2 is the combustion chamber 1, closed at its lower end by the rotating hearth 4, formed by a perforated disc. This rotary hearth is supported by a support column 12, which is driven in continuous or intermittent rotation by a motor 15 comprising a shaft 16 and a pinion 14 which engage a rack 13 surrounding the column 12. A

  its lower end, column 12 is supported in

  tation by any system 28 allowing free

  rotation of the column 12. Below the sole 4, a double

  the hopper system 5 and 6 is arranged as follows:

  te: a first series of central hoppers 5 is arranged

  circularly around column 12, extending

  substantially on the entire perforated part

  of sole 4, and a second series of peripheral hoppers

  ques 6 being arranged concentrically around the central hoppers 5 so as to extend below and

  outwards from the outer edge 25 of the sole 4. The

  seems hoppers 5 and 6 constitutes a closed construction with the exception of the openings in the lower parts 8

  and 9 of said hoppers and of the peripheral edge 30 of the

  external ties 19 of the peripheral hoppers 6 as well as of the combustion air pipes 7, leaving the support column 12, pipes which are connected in a manner not shown with a combustion air supply system.

  The lower parts 8 and 9 of the central hoppers

  trales and peripherals are submerged in con-

  held in an annular trough 10, so as to make it watertight

  ches the openings of these parts of the hoppers. The outer part 19 of the peripheral hoppers 6 are provided with a

  circular channel 17 filled with water in which is submerged-

  manages the lower edge 18 of the cylindrical wall 3, so that

  sealing the outer edge 30 of all of the

peripheral mass 6.

  The annular trough 10 has a bottom 11 inclined outwards as well as an ash pan 20 arranged at

  anywhere on the periphery of this annular trough

  laire. The lower parts 8 and 9 of the hoppers 5 and 6 carry a squeegee 21, arranged parallel to the

inclined bottom surface 11.

  We will describe in the following the function-

  the incinerator illustrated. A load of waste is introduced into the combustion chamber after opening the sliding door 23, which door is closed after the end of the loading. The waste falls on the rotating floor 4, where it is burned. When burning this waste gas and ash are produced, the

  gases being released from the combustion chamber by a system

  chimney flue 3 'or a heat recovery unit not shown

  smelled. As illustrated later in FIG. 3, the ash is released from the combustion chamber 1. The rotary hearth 4 has openings 24 through which air enters the combustion chamber, air supplied

  by a combustion air supply system not shown

  smelled. Not inevitably, a certain part of the ash disposed above the rotary hearth 4 falls to

  through the openings 24 as it is necessary to re-

  pick this part of the ash and remove it to avoid

  ter its accumulation in the lower parts of 7.

  the incinerator. The release system for this par-

  ash tie is constituted by the hoppers 5 and 6, which

  are attached to sole 4 and which guide the ash as-

  bant through the openings 24 or the slot 26 between the outer edge 25 of the hearth 4 and the cylindrical wall 3, in the annular bucket 10 filled with water. The ash falling on the bottom

  inclined 11 of this annular trough 10 is scraped by the squeegee-

  te 21, so as to be driven towards the outside of this annular trough, as it falls in the ash pan 20 when the scraper moves to the angular position

  from this bin. The hydraulic seal formed by the annular channel

  area 17 as well as the submersion of the lower parts 8 and 9 of the hoppers 5 and 6 in the water of the annular trough 10 make it possible to maintain the complete sealing of the system of the hoppers below the hearth 4 during the rotation of the latter. FIG. 2 is a horizontal section view through the cylindrical wall 3 releasing the view on the floor 4,

  the outer edge 25 of which is separated from the inner surface

  re of the wall 3 by a slot 26. The sole 4 is provided with

  openings 24 over a large part of its surface, open-

  res which are not fully illustrated in two sets

  rights only. The set of hoppers 5 and 6 arranged in

  below sole 4 is illustrated in dotted lines, also

  incomplete, it being understood that each sector of the hearth 4 delimited by the radial lines 35 comprises a pair of central hopper 5 and peripheral hopper 6, the set of hoppers 5 being separated from the set of hoppers 6 by the line 29, concentric with the hearth 4. The lower parts 8 and 9 of the hoppers are arranged on the concentric circle so as to cooperate with the annular trough not shown during the rotation of the hearth 4,

as described above.

  Figure 3 also shows a horizontal section

  the upper part of the incinerator according to the 8. present invention similar to FIG. 2, the direction of rotation of the hearth 4, inside the cylindrical wall 3, is indicated by arrow 34. The cylindrical wall 3 has a protruding part 33 which produces a hole 32 enlarging the slot 26 on a part of the periphery of the sole 4. A stationary blade 31 is arranged in an inclined manner by

  relation to the radial direction such as any object or cent

  dre deposited on the revolving floor is driven out-

  laughing when the sole rotates in the direction of the arrow

  che 34, in order to fall into the hole 32. The geometry of the hole 32 is such that the ash falls on a ramp 36 which directs it into a peripheral hopper located below the hearth 4. In this way, the main clearance of ash from the combustion chamber also ends up in the trough

  annular and then in the ash pan.

  It is understood that this main release of cent

  dres illustrated in figure 3 is only a particular embodiment and does not constitute a limitation

  of the scope of the present invention.

  The present invention has been described by means of an exemplary embodiment without being limited to this particular form, and numerous modifications which will appear to those skilled in the art are considered.

  as included in the scope of the following claims.

9.

Claims (9)

  1 - Incinerator with a combustion chamber   bustion (1) limited at its lower end by a rotating sole (4) consisting of a rotary disc on which objects to be incinerated are deposited, this disc being perfo-   re by a plurality of openings (24) for supplying   ture of combustion air, and at least one hopper (5, 6) located below and integral with the rotary hearth (4) and extending substantially over the entire surface of the rotary hearth (4) to receive ash or   other objects falling below said sole, character-   laughed in that the hoppers (5, 6) have extremi   open lower tees (8, 9) an annular trough (10), comprising an automatic ash release system being arranged below these open ends (8, 9) so as to receive the ash or other objects falling in   through the bottom (4) during combustion.   2 - Incinerator according to claim 1, charac-   terized in that the annular trough (10) comprises water into which the ash falls.   3 - Incinerator according to claim 2, charac-   terized in that the hopper (s) (5, 6) have constricted lower parts (8, 9) which are submerged   in the water contained in the annular trough (10).   4 - Incinerator according to claims 2 or 3,   characterized in that the annular trough (10) has a   bottom (11) inclined outwards.   - Incinerator according to claim 4, characterized in that the hopper (s) (5,6) include a scraper (21) oriented parallel to the inclined bottom (11) of the annular trough (10) and capable of push the ash deposited at the inclined bottom (11) towards an ash pan (20) during the rotation of the sole (4).   6 - Incinerator according to any of the   vendications 1 to 5, characterized in that a first 10. series of central hoppers (5) is arranged below a perforated part of the rotary hearth (4) concentrically around a support column (12 ) to guide the ash falling through the openings (24) in the annular trough (10), and a second series of trè   peripheral peripheries (6) is arranged below the outer edge   laughing (25) from the sole (4) to receive any ash or   very objects falling between the edge (25) of the sole (4)   and a cylindrical wall (3). limiting the combustion chamber- tion (1).   7 - Incinerator according to any one of   claims 1 to 6, characterized in that the enclosure   of the combustion chamber comprises a vault (2), a cylindrical wall (3) and the rotating hearth (4) formed of a perforated disc.   8 - Incinerator according to claim 7, charac-   characterized in that the cylindrical wall (3) has an indented edge   lower (18) which is hermetically linked with the outer edge (30) of the series of peripheral hoppers (6) by a hydraulic seal.   9 - Incinerator according to claim 8, charac-   characterized in that the hydraulic seal has a channel   annular (17) tightly secured to the ex-   of the peripheral hoppers (6), said channel being filled with water in which is submerged   the lower edge (18) of the cylindrical wall (3).   - Incinerator according to claim 8,   characterized in that the combustion chamber (1) comprises   te a stationary blade (31) which is oriented parallel to the surface of the hearth (4) in an oblique direction relative to the radial direction of the hearth (4) so as to cause the release of ash from the hearth during the rotation of the latter.   11 - Incinerator according to claim 7, 11. characterized in that the vo te (2) comprises a loading hopper (22) and a sliding door (23) having a sealing system. I / z /,.22 ô: 7-- 2/2 jc36- 3 32'26 33 3 \ ,,, I