EP1875133A1 - Cooling system for a combustion grate in an incineration plant - Google Patents

Cooling system for a combustion grate in an incineration plant

Info

Publication number
EP1875133A1
EP1875133A1 EP06711018A EP06711018A EP1875133A1 EP 1875133 A1 EP1875133 A1 EP 1875133A1 EP 06711018 A EP06711018 A EP 06711018A EP 06711018 A EP06711018 A EP 06711018A EP 1875133 A1 EP1875133 A1 EP 1875133A1
Authority
EP
European Patent Office
Prior art keywords
grate
cooling fluid
beams
fluid circulation
circulation system
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.)
Granted
Application number
EP06711018A
Other languages
German (de)
French (fr)
Other versions
EP1875133B1 (en
Inventor
John Kenneth Olsen
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.)
Babcock and Wilcox Volund AS
Original Assignee
Babcock and Wilcox Volund AS
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 Babcock and Wilcox Volund AS filed Critical Babcock and Wilcox Volund AS
Publication of EP1875133A1 publication Critical patent/EP1875133A1/en
Application granted granted Critical
Publication of EP1875133B1 publication Critical patent/EP1875133B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H3/00—Grates with hollow bars
    • F23H3/02—Grates with hollow bars internally cooled
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H2900/00—Special features of combustion grates
    • F23H2900/03021—Liquid cooled grates

Definitions

  • the present invention relates to a cooling fluid circulation system of the kind set forth in the preamble of claim 1
  • cooling fluid circulation systems of this kind it is known to have the grate beams arranged to be movable for providing a movement of the fuel on top of the grate and blowing primary air through the grate from a primary air chamber below the grate Connections for circulating cooling fluid through the grate beams are normally positioned at the bottom side of the grate beams in order not to influence the movement of the fuel on top of the grate.
  • Fig. 1 is a diagrammatic side view partly in longitudinal section of a combustion grate in which the invention can be implemented
  • Fig, 2 schematically shows the tubing connected to a movable grate beam according to the invention
  • Fig. 3 schematically shows the lead-in of the rigid movable tubes through the primary air chamber wall and the externally positioned flexible bellow connecting the movable rigid tubing to the wall of the primary air chamber.
  • Fig 4 schematically shows a lyre-formed tube for providing a series connection between inlets and outlets of serially connected grate beams
  • Fig. 5 schematically shows a spiral-formed tube for providing the connection between inlets and outlets of serially connected grate beams.
  • the waste incineration plant shown in Fig 1 comprises a number of grate sections I- IV, each comprising downwardly stepped grate beams 1 extending in the moving direction of the fuel on top of the grate sections and arranged to be alternating movable and stationary grate beams in the crosswise direction.
  • each grate section comprises a number of grate beams 1 positioned above a primary air chamber P for introducing primary air through primary air openings in the grate
  • a movable grate beam 1 is provided with a moving mechanism 2 at one end and a support roNer 3 at the opposite end, whereby the movable grate beam 1 can be moved in the longitudinal direction thereof.
  • the grate beam 1 is provided with a cooling fluid channel (not shown in detail) which is supplied with cooling fluid through a rigid tube 4 and the cooling fluid leaves the grate beam through the rigid tube 5,
  • the tubing 4, 5 is connected to an inlet header 6 and an outlet header 7, respectively, positioned at a suitable distance below the grate beam 1 , although being rigid, the tubing 4, 5 allows a certain minimum movement of the grate beam relative to the headers 6, 7 and thus a minor relative movement of the individual movable grate beams 1.
  • the corresponding stationary grate beams positioned between the movable grate beams are correspondingly provided with similar inlet and outlet tubing and inlet and outlet headers or conventional tubing and headers, which, however, are not part of the present invention and will thus not be described in detail in the following.
  • said stationary grate beams are also connected to inlet and outlet headers and these stationary inlet and outlet headers are connected out through the wall of the primary air chamber in a traditional way.
  • the above-mentioned distance between the grate beam and the inlet header 6 and outlet header 7 respectively can be reduced by using lyre-formed, spiral-formed or coil-formed tubing 4, 5.
  • the headers 6, 7 are directed to a box 8 positioned on the side of the primary air chamber P, and as shown in Fig, 3 the iead-ins for the headers 6, 7 extend out through openings 1 1 , 12 in the box 8, said openings 1 1 , 12 being provided with studs for connecting the bellows 9, 10 in a airtight manner to the box 8.
  • the opposite ends of the bellows 9, 10 are connected in an airtight manner to the tubing 6, 7 for the inlet and outlet of cooling fluid, the airtight connections schematically indicated by the clamps 13- 16.
  • the headers 6, 7 move mainly in the longitudinal direction of the bellows 9, 10 without interference with the openings 1 1 , 12 and in this way the rigid tubing 4, 5, 6, 7 is connected to the ambient outside the primary air chamber P in a movable manner without risk of leakage of primary air out of the primary air chamber.
  • a flexible tubing is provided for connecting the inlet and outlet for cooling fluid to the stationary part of the cooling fluid circulation system.
  • the serial connection between inlets and outlets of serially connected grate beams can be provided in the form of lyre-formed, spiral- formed, or coil-formed tubes in order to provide a certain freedom of relative movement between the serially connected grate beams.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Furnace Details (AREA)
  • Fertilizers (AREA)

Abstract

In a cooling fluid circulation system for an incineration or combustion grate in an incineration or combustion plant, the grate comprises a number of grate beams, at least some of which are movable for providing a movement of the fuel on top of said grate, primary air being blown through the grate from a primary air chamber below the grate Connections for circulating cooling fluid through said grate beams are positioned at the bottom side of said grate beams, inside said primary air chamber, and connected to rigid tubing, possible headers and flexible tubing, preferably in the form of bellow tubes, for providing a connection between moving tubing and stationary tubing in the cooling fluid circulation system. The flexible tubing is positioned outside the primary air chamber and the iead-in for the moving, rigid tubing through the wall of said primary air chamber is provided with a flexible bellow in order to avoid leakage of primary air along the tube. Hereby the flexible tubing is not subjected to the grate screenings falling down from the grate and the high temperatures thereof.

Description

COOLING FLUID CiRCULATiON SYSTEM FOR AN INCINERATION QR COMBUSTION GRATE IN AN INCINERATION OR COMBUSTION PLANT
TECHNICAL FiELD
The present invention relates to a cooling fluid circulation system of the kind set forth in the preamble of claim 1
BACKGROUND ART
In cooling fluid circulation systems of this kind it is known to have the grate beams arranged to be movable for providing a movement of the fuel on top of the grate and blowing primary air through the grate from a primary air chamber below the grate Connections for circulating cooling fluid through the grate beams are normally positioned at the bottom side of the grate beams in order not to influence the movement of the fuel on top of the grate. In order to allow the movement of movable grate beams, flexible tubing has normally been provided underneath the grate inside the primary air chamber before the rigid tubing exiting this primary air chamber, whereby a fixed connection between the tubing and the side walls of the primary air chamber has been established A cooling fluid circulation system of this type, which however does not specifically mention the flexible tubing, is e,g. known from EP 0 804 706.
DiSCLOSURE OF THE INVENTION
It is the object of the present invention to provide a cooling fluid circulation system of the kind referred to above, with which it is possible to avoid the positioning of flexible tubing underneath the grate, and this object is achieved with a cooling fluid circulation system of said kind, which according to the present invention also comprises the features set forth in the characterising clause of claim 1 With this arrangement, the flexible tubing is positioned outside the primary air chamber and is thus not subjected to the grate screenings falling down from the grate and the possible high temperatures thereof, and the lead-in for the moving rigid tubing through the wail of the primary air chamber is provided with a flexible bellow in order to avoid leakage of primary air along the tube from inside the primary air chamber to the surroundings Preferred embodiments of the cooSing fluid circulation system, the advantages of which will be evident for a man skilled in the art after reading the following detailed description, are indicated in the subordinate claims.
BRIEF DESCRIPTiON QF THE DRAWINGS
In the following detailed part of the present description, the invention wii) be explained in more detail with reference to the exemplary embodiments of a cooling fluid circulation system according to the invention shown in the drawings, in which
Fig. 1 is a diagrammatic side view partly in longitudinal section of a combustion grate in which the invention can be implemented,
Fig, 2 schematically shows the tubing connected to a movable grate beam according to the invention,
Fig. 3 schematically shows the lead-in of the rigid movable tubes through the primary air chamber wall and the externally positioned flexible bellow connecting the movable rigid tubing to the wall of the primary air chamber.
Fig 4 schematically shows a lyre-formed tube for providing a series connection between inlets and outlets of serially connected grate beams, and
Fig. 5 schematically shows a spiral-formed tube for providing the connection between inlets and outlets of serially connected grate beams.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The waste incineration plant shown in Fig 1 comprises a number of grate sections I- IV, each comprising downwardly stepped grate beams 1 extending in the moving direction of the fuel on top of the grate sections and arranged to be alternating movable and stationary grate beams in the crosswise direction. Thus, each grate section comprises a number of grate beams 1 positioned above a primary air chamber P for introducing primary air through primary air openings in the grate As shown in Fig, 2 a movable grate beam 1 is provided with a moving mechanism 2 at one end and a support roNer 3 at the opposite end, whereby the movable grate beam 1 can be moved in the longitudinal direction thereof. The grate beam 1 is provided with a cooling fluid channel (not shown in detail) which is supplied with cooling fluid through a rigid tube 4 and the cooling fluid leaves the grate beam through the rigid tube 5, The tubing 4, 5 is connected to an inlet header 6 and an outlet header 7, respectively, positioned at a suitable distance below the grate beam 1 , Although being rigid, the tubing 4, 5 allows a certain minimum movement of the grate beam relative to the headers 6, 7 and thus a minor relative movement of the individual movable grate beams 1. The corresponding stationary grate beams positioned between the movable grate beams are correspondingly provided with similar inlet and outlet tubing and inlet and outlet headers or conventional tubing and headers, which, however, are not part of the present invention and will thus not be described in detail in the following. However, said stationary grate beams are also connected to inlet and outlet headers and these stationary inlet and outlet headers are connected out through the wall of the primary air chamber in a traditional way.
The above-mentioned distance between the grate beam and the inlet header 6 and outlet header 7 respectively can be reduced by using lyre-formed, spiral-formed or coil-formed tubing 4, 5.
The headers 6, 7 are directed to a box 8 positioned on the side of the primary air chamber P, and as shown in Fig, 3 the iead-ins for the headers 6, 7 extend out through openings 1 1 , 12 in the box 8, said openings 1 1 , 12 being provided with studs for connecting the bellows 9, 10 in a airtight manner to the box 8. The opposite ends of the bellows 9, 10 are connected in an airtight manner to the tubing 6, 7 for the inlet and outlet of cooling fluid, the airtight connections schematically indicated by the clamps 13- 16.
When the movable grate beams 1 are moving, the headers 6, 7 move mainly in the longitudinal direction of the bellows 9, 10 without interference with the openings 1 1 , 12 and in this way the rigid tubing 4, 5, 6, 7 is connected to the ambient outside the primary air chamber P in a movable manner without risk of leakage of primary air out of the primary air chamber. At a position after the clamps 15, 16, a flexible tubing is provided for connecting the inlet and outlet for cooling fluid to the stationary part of the cooling fluid circulation system.
In a situation where it is convenient that the cooling fluid circulates in series in at least some of the grate beams, the serial connection between inlets and outlets of serially connected grate beams can be provided in the form of lyre-formed, spiral- formed, or coil-formed tubes in order to provide a certain freedom of relative movement between the serially connected grate beams.
Above the invention has been described in connection with a specific embodiment thereof, as indicated in the drawings, however, many modifications may be envisaged by a man skilled in the art without departing from the following claims Such modifications include the use of the cooling fluid circulation system in connection with other types of movable incineration grate beams, such as individually movable grate beamss which however would require separate lead-in systems for the separately movable grate beams and separate headers therefor

Claims

1. Cooling fluid circulation system for an incineration or combustion grate in an incineration or combustion plant, said grate comprising a number of grate beams, at least some of which are movable for providing a movement of the fuel on top of said grate, primary air being blown through the grate from a primary air chamber below the grate, connections for circulating cooling fluid through said grate beams being positioned at the bottom side of said grate beams, inside said primary air chamber, and connected to rigid tubing, possible headers and flexible tubing, preferably in the form of bellow tubes, for providing a connection between moving tubing and stationary tubing in the cooling fluid circulation system, c h a r a c t e r i s e d by said flexible tubing being positioned outside the primary air chamber and the lead-in for the moving, rigid tubing through the wall of said primary air chamber being provided with a flexible bellow in order to avoid leakage of primary air along the tube.
2. Cooling fluid circulation system in accordance with claim 1 , c h a r a c t e ri s e d by the direction of the rigid tube in the lead-in being mainly in the moving direction thereof at this point
3. Cooling fluid circulation system in accordance with claim 1 or 2, c h a r a ct e r i s e d by the cooling fluid being circulated in parallel in the grate beams and the inlet and outlet for cooling fluid circulation through the stationary beams being connected to at least one set of headers positioned in such a distance below the grate beams that the vertical rigid tubes allow a certain freedom of relative movement between the stationary grate beams, and the inlet and outlet for the cooling fluid for the moving grate beams being connected via at least one other set of headers, the headers being positioned in such a distance below the grate beams that the vertical rigid tubes allow a certain freedom of relative movement between the moving grate beams
4 Cooling fluid circulation system in accordance with claim 1 or 2, c h a r a ct e r i s e d by the cooling fluid being circulating in parallel in the grate beams and the inlet and outlet for cooling fluid circulation through the stationary beams being connected to at least one set of headers positioned below the grate beams and connected to the inlets and outiets of the grate beams through lyre-formed, spiral-formed, or coil-formed tubes in order to ailow a certain freedom of relative movement between the stationary grate beams, and the inlet and outlet for the cooling fluid for the moving grate beams being connected via at least one other set of headers, the connection between the headers and the inlets and outlets of the grate beams being provided in the form of lyre-formed, spiral-formed or coil-formed tubes in order to allow a certain freedom of relative movement between the moving grate beams.
5. Cooling fluid circulation system in accordance with claim 1 or 2, characte ri sed by the cooling fluid circulating in series in at least some of the grate beams and the serial connection between inlets and outlets of serially connected grate beams being provided in the form of lyre-formed, spiral-formed or coil-formed tubes, thus providing a certain freedom of relative movement between serially connected grate beams.
6., Cooling fluid circulation system in accordance with any of the preceding claims, characterised by the movable grate beams being movable mainly linearly and mainly in the direction of transport of the fuel on top of the grate.
7. Cooling fluid circulation system in accordance with claim 6, cha racterised by the grate beams of the grate being positioned side by side and alternately movable and stationary.
8. Cooling fluid circulation system in accordance with claim 6 or 7, characterised by the grate beams extending longitudinally in the direction of transport of the fuel on top of the grate.
9. Cooling fluid circulation system in accordance with any of the claims 6-8, characterised by the grate being subdivided in successive grate sections in said transport direction.
10. Cooling fluid circulation system in accordance with any of the claims 6-9, characterised by said grate beams having a grate top stepped downwardly in said transport direction. 11 Cooling fluid circulation system in accordance with any of the preceding claims, characterised by the cooling fluid being water.
EP06711018A 2005-04-13 2006-03-03 Cooling system for a combustion grate in an incineration plant Active EP1875133B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200500528 2005-04-13
PCT/IB2006/050671 WO2006109199A1 (en) 2005-04-13 2006-03-03 Cooling system for a combustion grate in an incineration plant

Publications (2)

Publication Number Publication Date
EP1875133A1 true EP1875133A1 (en) 2008-01-09
EP1875133B1 EP1875133B1 (en) 2008-09-10

Family

ID=36588690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06711018A Active EP1875133B1 (en) 2005-04-13 2006-03-03 Cooling system for a combustion grate in an incineration plant

Country Status (9)

Country Link
EP (1) EP1875133B1 (en)
JP (1) JP4948527B2 (en)
KR (1) KR101289560B1 (en)
CN (1) CN101180499B (en)
AT (1) ATE408096T1 (en)
DE (1) DE602006002742D1 (en)
DK (1) DK1875133T3 (en)
HK (1) HK1115764A1 (en)
WO (1) WO2006109199A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1975507A1 (en) * 2007-03-29 2008-10-01 ThyssenKrupp Xervon Energy GmbH Grate for combustion plants
EP1983261B1 (en) * 2007-04-20 2015-04-08 Ernst Schenkel Combustion plant with a moving grate and a device to supply cooling liquid
KR101913063B1 (en) * 2018-03-07 2018-10-29 남창호 Cooling method of Water-cooled stocker with cooling path

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2240590A (en) 1938-05-02 1941-05-06 George W Wallace Automatic fluid cooled grate
US4026247A (en) * 1975-12-15 1977-05-31 S. J. Agnew Fluid cooled dump grate
JPH02106613A (en) * 1988-10-13 1990-04-18 Hitachi Zosen Corp Fire grate structure of incinerator
DK169828B1 (en) * 1992-11-27 1995-03-06 Smidth & Co As F L Flexible air supply connection in grate cooler
DK171048B1 (en) 1995-01-24 1996-04-29 Voelund Ecology Systems As Fuel transport incinerator for incinerators, in particular waste incinerators
DE19749227C2 (en) 1997-11-07 1999-12-02 Krc Umwelttechnik Gmbh Water-cooled grate
EP0924464A1 (en) * 1997-12-19 1999-06-23 KOCH, Theodor Grate for a combustion plant and method for its cooling
JP2000146141A (en) * 1998-11-06 2000-05-26 Hitachi Zosen Corp Cooling structure for fire grate in stoker type refuse incinerator
US6220190B1 (en) * 1999-01-15 2001-04-24 George David Dumbaugh Water-cooled oscillating grate system
JP2002349833A (en) * 2001-05-25 2002-12-04 Kubota Corp Fire grate cooling mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006109199A1 *

Also Published As

Publication number Publication date
ATE408096T1 (en) 2008-09-15
CN101180499A (en) 2008-05-14
CN101180499B (en) 2012-07-04
DE602006002742D1 (en) 2008-10-23
DK1875133T3 (en) 2008-12-01
KR20080024112A (en) 2008-03-17
KR101289560B1 (en) 2013-07-24
EP1875133B1 (en) 2008-09-10
WO2006109199A1 (en) 2006-10-19
HK1115764A1 (en) 2008-12-05
JP4948527B2 (en) 2012-06-06
JP2008536087A (en) 2008-09-04

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