EP2028418A2 - Dispositif de décendrage pour installations de combustion - Google Patents
Dispositif de décendrage pour installations de combustion Download PDFInfo
- Publication number
- EP2028418A2 EP2028418A2 EP08162405A EP08162405A EP2028418A2 EP 2028418 A2 EP2028418 A2 EP 2028418A2 EP 08162405 A EP08162405 A EP 08162405A EP 08162405 A EP08162405 A EP 08162405A EP 2028418 A2 EP2028418 A2 EP 2028418A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- slag
- opening
- housing
- purification device
- slag container
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title abstract description 4
- 239000002893 slag Substances 0.000 claims abstract description 108
- 238000000746 purification Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims 3
- 238000007599 discharging Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 239000000498 cooling water Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000010791 domestic waste Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
Definitions
- the invention relates to a purification device for the discharge of slag from incinerators.
- Incineration plants are subject to various residues, including about 250 kg of slag per tonne of incinerated waste. In addition to a considerable heavy metal load, this slag also contains valuable materials such as metals.
- FIG. 1 shows such a Wet Entschlackungssystem according to the prior art.
- a slag roller 11 From the end of a slag roller 11, the unburned solids, in particular the incineration slag, fall through a shaft 12 into a water tank 14.
- the water tank 14 acts as a lock to prevent the entry of cold outside air into the furnace chamber, where this has a negative influence can have the combustion efficiency of the furnace.
- the waterline 15 in the water tank 14 is selected so that it is above the lower end of the shaft 12, so that no cold air passes from the outer space 19 into the inner space 18.
- the use of such a water lock has the advantage that the slag is cooled. At regular intervals an ejection element is moved from a first position 13 'next to the shaft to a second position 13 below the shaft 12, whereby the wet slag accumulated in the water tank 14 is pushed out of the water tank 14 and further onto a conveyor belt 16 via a ramp 17 , The resulting wet slag is difficult to recycle. In particular, it is not efficiently possible to separate residual metal components. As a consequence of this, virtually all of the slag has to be processed in a costly manner due to the heavy metal load and disposed of separately.
- a rotary valve is used.
- Such rotary valves or cell locks as they are known above all as metering devices for solids, have several comparatively small chambers, and must therefore be operated continuously. There is also the risk of jamming of larger metal parts in the import opening, which blocks the system. If the dimension of the cell lock chosen larger, the total mass of the system are excessively large. The high thermal load due to the hot slag also limits the lifetime of a cell sluice.
- Another variant of a purification plant is off EP 072277 in which a conventional Najiaustragsvorraum is modified by prior to the introduction of the slag in the water tank, a fine fraction screened out and dry discharged via screw conveyor.
- the screw conveyors also serve as an air seal.
- the remaining coarse fraction falls as usual in the water tank.
- the upstream screening stage can optionally be bypassed by a bypass in the form of a pivoting sheet, so that the entire slag is discharged wet.
- this form of purifying plant which uses a combined dry / wet discharge, only a fine fraction can be excreted dry.
- the object of the invention is to provide a purification device of the type mentioned above, which does not have the above-mentioned and other disadvantages.
- the purifying apparatus according to the invention is intended in particular to permit dry discharge of the entire slag and to be reliable in operation, for example against jamming and thermal and mechanical wear.
- the system should be easy to maintain, and be as simple and space-saving as possible.
- the purifying device has a slag container, which is arranged below the shaft, wherein the falling slag passes through an opening in the slag tank.
- the slag container is preferably designed drum-shaped, and is rotatably mounted about a horizontal longitudinal axis. After reaching a desired degree of filling and / or at other chosen regular intervals of the slag container is rotated from the filling position to substantially 180 ° about its longitudinal axis in a discharge position, so that the opening facing downward, and the slag falls from the container into a processing plant , To ensure the most efficient filling and emptying of the slag tank, the opening should be as large as possible.
- the opening therefore extends over as large an angle as possible over the circumference of the drum-shaped container, which also has the advantage that in the emptying position, the curved walls of the slag container adjoining the opening are as steep as possible, so that no slag can remain thereon.
- the drum-shaped slag container is arranged in a housing which essentially has the shape of the slag container, and is designed such that there is as small a distance as possible between the slag container and the housing wall, so that an air seal which is as dense as possible is ensured. It should of course be noted that the slag container must still be able to be rotated without friction.
- the housing wall has a first opening on, which corresponds to the opening of the slag tank. Opposite the upper opening, the housing wall has a lower, second opening through which the slag can fall out in the emptying position. The second opening also substantially corresponds to the opening of the slag tank.
- the lower opening of the housing is equipped with flaps, so that during the rotation of the slag container, the tightness is ensured, and during emptying, nevertheless, the entire opening of the slag tank can be used.
- the slag tank advantageously has a water cooling, which on the one hand increases the service life of the purifying apparatus according to the invention, and on the other hand makes it possible to precool the still hot slag.
- FIG. 1 shows a wet slagging device according to the prior art, in a vertical sectional view.
- FIG. 2 shows a possible embodiment of an inventive slagging device, (a) in a section perpendicular to the longitudinal axis of the slag tank, and (b) along the longitudinal axis.
- FIG. 3 shows a filling and emptying cycle of a purification device according to the invention.
- FIG. 2 (a) An advantageous embodiment of an inventive slagging device 20 is shown in FIG. 2 (a) , in a section perpendicular to the longitudinal axis 24 of the slag tank 21st
- FIG. 2 (b) shows the same inventive Entschlackungsvorraum, in a section along the longitudinal axis 24 of the slag tank.
- the slag tank 21 is in the filling position, d. H. the opening 25 of the drum-shaped slag container 21 points upwards, and the slag container 21 is opened upwards against the shaft 12 or the interior 18 of the oven.
- the slag container 21 is arranged in a housing 39, with two curved lateral housing walls 35 and two terminal housing walls 36.
- the curvature of the lateral housing walls 35 substantially corresponds to the outer wall 28a of the slag container, so that the smallest possible distance between them remains, and the invention Purification device is substantially air and gas tight.
- the purification device In the region of the lower, second opening of the housing 39, the purification device has two pivotally mounted side flaps 22, 22 ', which can be pivoted in the example shown by hydraulic actuators. During filling of the slag tank 21, the side flaps 22, 22 'are closed, and the jaws of the side flaps are sealed over the entire length on the outer wall 28a of the slag tank.
- the water-cooled slag container is rotatably mounted via two hollow shafts 23, 23 ', wherein a shaft 23' is coupled to a drive unit 37.
- the slag tank 21 comprises an inner wall 28b and an outer wall 28a, which are spaced apart by webs 28c, and form a cooling water chamber 26. The flow 27 and the return 28 of the cooling water through the hollow shafts 23, 23 '.
- baffles 31, 31 ', 31 are mounted, which guide the slag 30 into the opening 25 of the slag tank 21.
- FIG. 2 (a) shows an enlargement of the corresponding detail in the region of the right edge 29 '.
- Step (I) corresponds to the filling position.
- the slag tank 21 is partially filled with slag 30.
- the slag roll is now stopped and the slag container is rotated about its longitudinal axis.
- the slag container is still open towards the interior 18.
- the emptying cycle can be gradual, or continuous.
- the two side flaps 22, 22 ' can be operated simultaneously, as in FIG. 3 shown, or separately.
- the activation or actuation of the actuator elements of the side flaps can take place electronically, or else mechanically, for example via a cam control on the shaft 23. It is also possible not to switch off the slag roller during a discharge cycle. The falling during the discharge cycle through the shaft 12 slag would then temporarily accumulate in the shaft 12 lying on the outer wall 28a of the slag tank 21 to then fall during the reverse rotation of the slag tank in the filling position in the slag tank.
- the vibrating channel 32 is arranged under a hood 33, which sealingly adjoins the cover of the purification device 20 according to the invention. Via a suction device 34, a negative pressure is generated within the hood 33. At the end of the vibrating channel 32, the slag 30 reaches a conveyor belt 16 and is sent for further processing. The prevailing in the hood 33 negative pressure generates an air flow from the cover of the conveyor belt, which entrains the fluidized particulate matter in the suction, where then the fine dust is deposited, for example, by a cyclone dust collector, to be disposed of separately.
- the drive 37, the bearings 23 a, and the shaft seals are placed outside the hood 33 so that they are always accessible for maintenance and repairs.
- the lower air pressure within the hood 33 has the additional advantage that the pressure difference between the interior 18 and outer space 19, which in this case corresponds to the hood 33, is lowered, which further reduces air currents through possibly not completely tight points of the purification device.
- a plurality of purification devices according to the invention can also be arranged side by side. This may be advantageous over longer slag containers, as longer slag containers, which are only supported by their shafts, could sag. Alternatively, however, additional support means may be provided along the slag container, such as rollers.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH13072007 | 2007-08-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2028418A2 true EP2028418A2 (fr) | 2009-02-25 |
| EP2028418A3 EP2028418A3 (fr) | 2012-05-30 |
Family
ID=39790244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08162405A Withdrawn EP2028418A3 (fr) | 2007-08-20 | 2008-08-14 | Dispositif de décendrage pour installations de combustion |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP2028418A3 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072277A1 (fr) | 1981-08-06 | 1983-02-16 | Regie Nationale Des Usines Renault | Dispositif de pose automatique d'un élément de vitrage d'une garniture de pavillon ou analogue |
| EP0372039A1 (fr) | 1988-06-16 | 1990-06-13 | Schwyter Leo Ag | Procede et dispositif de traitement de scories de fours d'incineration de dechets. |
| CH687441A5 (de) | 1988-10-13 | 1996-12-13 | Abb Management Ag | Verfahren und Vorrichtung zum Aufbereiten von Schlacke aus Abfallverbrennungsanlagen |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE707742C (de) * | 1937-11-24 | 1941-07-02 | Babcock & Wilcox Dampfkessel W | Schlackenaustragvorrichtung mit Zellenrad |
| GB2014284B (en) * | 1978-01-24 | 1982-07-21 | British Gas Corp | Removing slag |
| FR2546086A1 (fr) * | 1982-07-22 | 1984-11-23 | Albouy Marcel | Perfectionnement aux procedes d'extinction des cendres contenant de la chaux vive par des dispositions techniques et technologiques assurant leur extinction totale en cycle continu |
-
2008
- 2008-08-14 EP EP08162405A patent/EP2028418A3/fr not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072277A1 (fr) | 1981-08-06 | 1983-02-16 | Regie Nationale Des Usines Renault | Dispositif de pose automatique d'un élément de vitrage d'une garniture de pavillon ou analogue |
| EP0372039A1 (fr) | 1988-06-16 | 1990-06-13 | Schwyter Leo Ag | Procede et dispositif de traitement de scories de fours d'incineration de dechets. |
| CH687441A5 (de) | 1988-10-13 | 1996-12-13 | Abb Management Ag | Verfahren und Vorrichtung zum Aufbereiten von Schlacke aus Abfallverbrennungsanlagen |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2028418A3 (fr) | 2012-05-30 |
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