EP0968389A1 - Grate with means for discharging of ash - Google Patents
Grate with means for discharging of ashInfo
- Publication number
- EP0968389A1 EP0968389A1 EP98906964A EP98906964A EP0968389A1 EP 0968389 A1 EP0968389 A1 EP 0968389A1 EP 98906964 A EP98906964 A EP 98906964A EP 98906964 A EP98906964 A EP 98906964A EP 0968389 A1 EP0968389 A1 EP 0968389A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grate
- ring
- units
- stationary
- peripheral ring
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/10—Under-feed arrangements
- F23K3/14—Under-feed arrangements feeding by screw
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B1/00—Combustion apparatus using only lump fuel
- F23B1/16—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H13/00—Grates not covered by any of groups F23H1/00-F23H11/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/26—Biowaste
- F23G2209/261—Woodwaste
Definitions
- Grate with means for discharging of ash.
- the present invention relates to a grate, which comprises essentially concentrically arranged stationary and rotating grate rings, which alternate from the centre outwards to the peripheral ring and in which each grate ring is lower than the next one inwards and has a greater diameter than it, so that fuel fed from underneath in the centre flows while it burns towards the peripheral ring, where the ash drops through openings arranged in it into an ashbox.
- a grate of the type referred to above is described in Finnish patent No. 95964.
- the rotating grate rings are set slightly eccentrically, when they also move the downwards flowing mass radially.
- the grate rings rotate in opposite directions, which improves the transport of the ash over the grate rings.
- An opening has been left between the peripheral ring of a grate of this kind and the wall, from which the ash drops into an ashbox beneath it. The opening must be quite wide, because the ash contains some large clinkers.
- the proportion of unburnt material in the ash increases. This limits the available output of the grate, though the grate could otherwise burn a much larger amount of fuel .
- the purpose of the invention is to create an improvement over the case referred to above.
- the characteristic features of the invention are described in the accompanying Claims.
- the intermediate space that was previously a free opening is covered with a grid construction, in which openings can be formed if necessary.
- the grate can then be loaded much more than previously, particularly for short periods, with no fear of considerable quantities of unburned material flowing with the ash.
- Even large lumps of clinker can be removed through the openings formed at regular intervals between the units, though otherwise the elements form a grid structure, on top of which combustion continues, with the fine ash nevertheless dropping through.
- Figure 1 shows a vertical cross-section of a combustion chamber, to which a grate according to the invention has been adapted.
- Figure 2 shows a partial enlargement of the cross-section in Figure 1 in the area of the peripheral ring, in which there is the new arrangement for removing ash.
- Figure 3 shows an adaption arranged on the peripheral ring, comprising stationary and moving units with the ash openings closed; the Figure includes a partial en- largement .
- Figure 4 shows the arrangement in Figure 3 with the units overlapped and forming ash openings; the Figure includes a partial enlargement.
- Figure 5 shows the vertical bracket in figure 2, seen from in front.
- a grate 1 according to the invention is adapted to a combustion chamber with a circular horizontal cross-section, which in this adaptation acts as the front chamber of a boiler.
- Grate 1 conforms to the patent publication referred to above, except for the arrangement of the periphery.
- the lower part of combustion chamber 2 is cylindrical, while the upper part is conical.
- the conical upper part is connected to flue 3, which is connected to the after combustion chamber and to a boiler (not shown) for recovering heat from the flue gases.
- the jacket arranged in the lower part of combustion chamber 2.
- An annular ashbox surrounds grate 1.
- Grate 1 according to the invention includes stationary and rotating grate sections.
- the stationary grate componens are grate rings 6a, 6b, 6c, and 6d, while the rotating grate sections are correspondingly grate rings 7a, 7b, and 7c. These are mutually arranged so that every other grate ring is stationary, while the others rotate.
- the inner and outermost grate rings 6a and 6d are stationary grate rings.
- the fuel feed channel 8 is arranged to run horizontally beneath grate 1 from the outside of the combustion chamber 2 to its centre.
- Fuel e.g. woodchips, conveyed by feed screw 9 travels along the feed channel 8 to the centre of the grate and rises through the feed cone to the top of grate 1.
- the fuel ignites and while burning flows over the grate rings 6a-d, 7a- c. Ash and possible burning residue move to the peripheral ring, in which there is an arrangement according to this invention.
- FIG. 2 shows the new arrangement according to the invention in detail.
- the ash openings 30 are formed between stationary grate ring 6d and the wall of the combustion chamber, but the openings can be closed by stationary and moving units 15 and 16.
- the moving units are installed on arm 19, which is in turn attached to support ring 14. This is supported vertically on five bearings 13 from the support structure of the grate.
- Figure 2 shows one bearing 13 in cross-section, while Figure 5 shows it seen from the front.
- Units 15 and 16 comprise circumferentially oriented bars 15.1 and 16.1. According to Figure 2, bars 15.1 and 16.1 interlap, so that the bars 16.1 of moving unit 16 push between the stationary bars 15.1.
- Figure 3 shows the general arrangement of the units 15 and 16 that cover the entire ring, with the ash openings closed.
- each unit 15 and 16 comprises three bars 15.1 and correspondingly 16.1 set at a distance to one another. Bars 15.1 are attached to arm 18 and correspondingly bars 16.1 are attached to arm 19.
- each unit 15, 16 comprises 2 - 4 bars 15.1, 16.1, at a radial distance of 2 - 4 cm.
- Support ring 14 is not only supported vertically, but also horizontally on five rollers 20, which roll along the cylindrical support structure.
- the support ring is driven by operating device 21, for example, a pneumatic cylinder, which is installed in air intake duct 22. In this way the operating device remains cool.
- the ash openings 30 are formed according to Figure 4 by using operating device 21, by means of which support ring 14 is turned slightly, so that the attached units 16 interlap with the stationary units. Even large lumps of clinker will fit through the ash openings 30 that are formed.
- the rolling surface of the support ring incorporates a step 17, which raises the units 16 when they are moved. This improves the cleaning of the units and reduces the risk of them j amming .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gasification And Melting Of Waste (AREA)
- Incineration Of Waste (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Frying-Pans Or Fryers (AREA)
- Baking, Grill, Roasting (AREA)
- Storage Of Fruits Or Vegetables (AREA)
- Soil Working Implements (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI970905A FI970905A0 (en) | 1997-03-03 | 1997-03-03 | Askrost |
FI970905 | 1997-03-03 | ||
FI974021 | 1997-10-22 | ||
FI974021A FI103832B (en) | 1997-03-03 | 1997-10-22 | Grate |
PCT/FI1998/000185 WO1998039601A1 (en) | 1997-03-03 | 1998-03-02 | Grate with means for discharging of ash |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0968389A1 true EP0968389A1 (en) | 2000-01-05 |
EP0968389B1 EP0968389B1 (en) | 2003-05-28 |
Family
ID=26160344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98906964A Expired - Lifetime EP0968389B1 (en) | 1997-03-03 | 1998-03-02 | Grate with means for discharging of ash |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0968389B1 (en) |
AT (1) | ATE241781T1 (en) |
AU (1) | AU6297598A (en) |
CA (1) | CA2282271C (en) |
DE (1) | DE69815079T2 (en) |
EE (1) | EE03575B1 (en) |
ES (1) | ES2201447T3 (en) |
FI (1) | FI103832B (en) |
PL (1) | PL191437B1 (en) |
PT (1) | PT968389E (en) |
WO (1) | WO1998039601A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO311747B1 (en) * | 1999-05-31 | 2002-01-21 | Laerdal Medical As | Method for determining whether a lifeless person has a pulse, based on impedance measurement between electrodes placed on patient skin, where the electrodes are connected to an external defibrillator sitting impedance measurement system, and |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE8003537L (en) * | 1980-05-12 | 1981-11-13 | Sjunne Johansson | FIREPLACE |
SE443638B (en) * | 1982-07-26 | 1986-03-03 | Goetaverken Energy Syst Ab | A furnace, and a procedure for the removal of ash and slag from same. |
FI95964C (en) * | 1994-05-20 | 1996-04-10 | Sermet Oy | Grate |
-
1997
- 1997-10-22 FI FI974021A patent/FI103832B/en not_active IP Right Cessation
-
1998
- 1998-03-02 AU AU62975/98A patent/AU6297598A/en not_active Abandoned
- 1998-03-02 EP EP98906964A patent/EP0968389B1/en not_active Expired - Lifetime
- 1998-03-02 PL PL335479A patent/PL191437B1/en unknown
- 1998-03-02 PT PT98906964T patent/PT968389E/en unknown
- 1998-03-02 CA CA002282271A patent/CA2282271C/en not_active Expired - Fee Related
- 1998-03-02 AT AT98906964T patent/ATE241781T1/en active
- 1998-03-02 DE DE69815079T patent/DE69815079T2/en not_active Expired - Lifetime
- 1998-03-02 WO PCT/FI1998/000185 patent/WO1998039601A1/en active IP Right Grant
- 1998-03-02 EE EEP199900389A patent/EE03575B1/en not_active IP Right Cessation
- 1998-03-02 ES ES98906964T patent/ES2201447T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9839601A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69815079D1 (en) | 2003-07-03 |
EE03575B1 (en) | 2001-12-17 |
WO1998039601A1 (en) | 1998-09-11 |
FI974021A (en) | 1998-09-04 |
PL335479A1 (en) | 2000-04-25 |
PL191437B1 (en) | 2006-05-31 |
FI974021A0 (en) | 1997-10-22 |
CA2282271A1 (en) | 1998-09-11 |
FI103832B1 (en) | 1999-09-30 |
AU6297598A (en) | 1998-09-22 |
FI103832B (en) | 1999-09-30 |
EP0968389B1 (en) | 2003-05-28 |
CA2282271C (en) | 2009-05-05 |
ATE241781T1 (en) | 2003-06-15 |
EE9900389A (en) | 2000-04-17 |
ES2201447T3 (en) | 2004-03-16 |
PT968389E (en) | 2003-09-30 |
DE69815079T2 (en) | 2004-04-15 |
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