EP1066486B1 - Method of incinerating waste material, and incinerator for carrying out the method - Google Patents
Method of incinerating waste material, and incinerator for carrying out the method Download PDFInfo
- Publication number
- EP1066486B1 EP1066486B1 EP98914835A EP98914835A EP1066486B1 EP 1066486 B1 EP1066486 B1 EP 1066486B1 EP 98914835 A EP98914835 A EP 98914835A EP 98914835 A EP98914835 A EP 98914835A EP 1066486 B1 EP1066486 B1 EP 1066486B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion zone
- combustion
- fluidized
- furnace
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
Definitions
- the present invention relates to an incinerator, said incinerator being of the kind set forth in the preamble of claim 1, and a method of incinerating waste material, said method being of the kind set forth in the preamble of claim 7.
- the first combustion zone is used to carry out an amount of incineration work per unit time below and up to a maximum determined by its capacity
- the second zone is used to deal with peak loads beyond the capacity of the first zone
- rotary kilns are rather costly and require considerable space as well as means to support them for rotation, and cannot quickly be adjusted to adapt to changes in the load, i.e. the amount per unit time and nature of the material to be treated after the initial processing in the first combustion zone.
- An ash-burning vibratory conveyor is probably considerably less costly and more adaptable than a rotary kiln, but - like the latter - it suffers from the disadvantage of having moving mechanical parts subjected to high temperatures.
- the European patent specification No. 280,091 discloses a method of incinerating waste material, said method being of the kind comprising the following steps:
- the fluidizing gas may be used as a vehicle for effecting adjustments of the combustion process taking place in the second combustion zone. It is e.g. possible to vary the intensity of combustion by varying the volume per unit time of the fluidizing gas and /or its composition by varying the percentage of e.g. oxygen, carbon dioxide or nitrogen.
- Another advantage of a fluidized-bed furnace is that - at least in principle - it comprises no moving parts with the exception of the particles of the fluidized bed itself, and it can also be constructed at a relatively low cost as compared to a vibratory ash-burning conveyor and - not least - a rotary kiln.
- the present invention also relates to a method of incinerating waste material.
- This method is of the kind set forth in the preamble of claim 7, and according to the invention it also comprises the features set forth in the characterizing clause of this claim 7.
- the incinerator shown in Figures 1 and 2 comprises the following well-known components:
- the boiler 4 and the flue-gas cleaner 5 are shown in "block-diagram" form, as they can be constructed in any suitable manner, known or unknown, to fulfil their functions.
- the problem referred to above is solved by, in addition to the first combustion zone represented by the space above the grate 3, providing a second combustion zone.
- previous incinerators have comprised rotary kilns or ash-burning vibratory conveyors as active parts of the second combustion zone.
- the active component of this second zone is constituted by a fluidized-bed furnace 6, preferably of the type comprising a body of sand or similar refractory particulate material constantly agitated by suitable means (not shown), such as jets of gas that may be heated or combustible to produce heat within the furnace 6.
- the sand in the fluidized-bed furnace 6 is not only being constantly agitated by fluidizing gas, that may be air, through a plenum 17 and the perforated bottom of the furnace 6, but is also preferably kept in constant circulation by e.g. a lifting conveyor 18, partly through the fluidized bed itself, partly through a separator 7 having an outlet 8 for ashes and/or slag, the sand being returned to the bed.
- fluidizing gas that may be air
- a lifting conveyor 18 partly through the fluidized bed itself, partly through a separator 7 having an outlet 8 for ashes and/or slag, the sand being returned to the bed.
- the sand in the fluidized bed itself moves in an upstream direction, i.e. towards the place, where material from the grate 3 falls onto the bed.
- the grate droppings are conveyed in a downstream direction to the fluidized-bed furnace 6 by means of a conveyor, in the exemplary embodiment shown as a worm conveyor 10, but other types of conveyors could, of course, be used, such as grate-belt conveyors, scraper conveyors, of the dry or wet type, or simply an inclined chute or skid.
- a conveyor in the exemplary embodiment shown as a worm conveyor 10, but other types of conveyors could, of course, be used, such as grate-belt conveyors, scraper conveyors, of the dry or wet type, or simply an inclined chute or skid.
- the incinerator shown in Figure 1 comprises a number of auxiliary inlets, i.e.
- the first, second and third auxiliary inlets 11, 12 and 13, respectively, are mainly intended for the introduction of sludge, such as sewage sludge, into the incinerator.
- sludge such as sewage sludge
- Which of these three auxiliary inlets to choose for this purpose will in each case depend on the operating conditions, such as the quality and quantity of the "normal" waste material being introduced to the inlet chute, as well as on the quality, such as combustibility and water content, and quantity of the sludge to be incinerated. If, for instance, the temperature on the grate 3 is very high, the heat present here can be exploited to evaporate water from sludge being introduced through the second auxiliary inlet 12, at the same time lowering the temperature to an acceptable operating level. The same applies to the third auxiliary inlet 13 in relation to the fluidized-bed furnace 6.
- the second auxiliary inlet 12 may be used for introducing waste material that for some reason or other is considered unsuitable for feeding through the chute 1.
- waste material could comprise waste material from hospitals etc., as well as sludge of various types.
- the exemplary embodiment shown in Figure 3 uses a rotary kiln 14 as the active part of the first combustion zone.
- a rotary kiln 14 instead of the furnace chamber 2 of Figure 1 with the grate 3 and the space 9 with the conveyor 10 makes these latter components superfluous, and an auxiliary inlet corresponding to the second auxiliary inlet 12 is simply not possible.
- the exemplary embodiment of Figure 3 corresponds to that of Figure 1, and its way of functioning should need no further explanation.
- this problem can be avoided by providing the flue-gas cleaner 5 with an exhaust fan 15 adapted to keep the pressure in the spaces upstream of it below atmospheric.
- the cleaner 5 also comprises an outlet 16 for dust separated from the flue gas.
- the first and second combustion systems in combination can be fed with a full variety of municipal and industrial waste types, e.g. completely filled waste bags, solid waste of similar bulk size, shredded waste, sludges, hospital waste, waste oil and bio-fuels, and at the same time it can be ensured that the slag and/or ashes discharged from the incinerator after combustion will have a content of unbumt matter typically below 0.5%.
- Municipal and industrial waste types e.g. completely filled waste bags, solid waste of similar bulk size, shredded waste, sludges, hospital waste, waste oil and bio-fuels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Gasification And Melting Of Waste (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Processing Of Solid Wastes (AREA)
- Fertilizers (AREA)
- Incineration Of Waste (AREA)
Abstract
Description
- an inlet chute 1, through which waste material to be incinerated (not shown) is introduced, and the lower end of which, possibily through infeed means (not shown), opens into
- a
furnace chamber 2, the bottom of which is constituted by - a grate 3 for supporting the waste material being incinerated during the
combustion process, said
furnace chamber 2 opening into - a
boiler 4 for extracting heat from the flue gas received from thefurnace chamber 2, and finally - a flue-
gas cleaner 5 for removing dust, noxious gases and other components from the flue gas received from theboiler 4.
- a first auxiliary inlet 11 leading into the side of the inlet chute 1 at some distance below its top,
- a second auxiliary inlet 12 leading into the
furnace chamber 2 in the roof or in the side wall above the grate 3, and - a third
auxiliary inlet 13 leading into the space above and placed vertically above the fluidized-bed furnace 6.
- 1
- inlet chute
- 2
- furnace chamber
- 3
- grate
- 4
- boiler
- 5
- flue-gas cleaner
- 6
- fluidized-bed furnace
- 7
- separator
- 8
- outlet (for ashes/slag)
- 9
- space
- 10
- worm conveyor
- 11
- first auxiliary inlet
- 12
- second auxiliary inlet
- 13
- third auxiliary inlet
- 14
- rotary kiln
- 15
- exhaust fan
- 16
- dust outlet
- 17
- plenum
- 18
- lifting conveyor
Claims (12)
- Incinerator comprisinga) an inlet chute (1) or equivalent means for introducing waste material to be incinerated, said inlet chute (1) feedingb) a first combustion zone (2,3; 14) with means for supporting the material being incinerated and means (4), such as a boiler, for extracting the heat of combustion in the gases produced by the combustion, andc) a second combustion zone (6) adapted to receive solid residue from said first combustion zone (2,3; 14) and to incinerate same,
characterized ind) that said second combustion zone comprises a fluidized-bed furnace (6),e) that said fluidized-bed furnace (6) is of the kind containing a filling of refractory particulate material, such as sand, and is provided with means for agitating said particulate material and circulating it through a circuit comprising the furnace (6) itself and a separator (7) for separating other material, such as ashes and/or slag and/or other incombustible matter, from said particulate material, and removing (8) said other material from said circuit (6,7), andf) that said fluidized-bed furnace (6) is arranged in such a way, that said particulate material in the furnace itself moves in a direction towards said first combustion zone and towards the place where the material from the first combustion zone falls onto the bed such that large objects can be removed immediately after falling onto the bed. - Incinerator according to claim 1, characterized in that said first combustion zone comprises a rotary kiln (14) adapted to allow or cause the material being incinerated to move towards said fluidized-bed furnace (6).
- Incinerator according to claim 1, characterized in that said first combustion zone comprises a furnace chamber (2) with a grate (3) that is inclined downwards in the downstream direction or otherwise adapted to cause or allow the material being incinerated to move towards said fluidized-bed furnace (6).
- Incinerator according to claim 3, characterized by means (10) in the space (9) below said grate (3) to convey or allow movement of material having fallen through openings in said grate towards said fluidized-bed furnace (6).
- Incinerator according to any one or any of the claims 1-4, characterized by at least one auxiliary inlet (11,12,13) adapted to introduce flowable material, such as sludge, either (11) into said chute (1) and/or (12) above said first combustion zone (2,3) and/or (13) above said fluidized-bed furnace (6).
- Incinerator according to any one or any of the claims 1-5, characterized by means (15) to keep the pressure within said first and second combustion zones and in spaces communicating directly therewith below the pressure in the surrounding atmosphere.
- Method of incinerating waste material, said method comprising the following steps :a) introducing the waste material into and subjecting it to combustion in a first combustion zone (2,3;14),b) from said first combustion zone (2,3;14) conducting gaseous combustion products through heat-exchange means (4), and removing remaining solids from said first combustion zone (2,3;14)c) transferring said remaining solids to a second combustion zone (6),d) in said second combustion zone (6) subjecting said remaining solids received from said first combustion zone (2,3;14) to further combustion, ande) from said second combustion zone (6)e1) conducting gaseous combustion products through said heat-exchange means (4), ande2) removing solids remaining after said further combustion,f) for said second combustion zone using a fluidized-bed furnace (6) of the kind containing particles of refractory material, e.g. sand,g) continuously moving said particles together with any ashes and/or slag out from said fluidized-bed furnace through means (7) for separating said ashes and/or slag from said particles and returning the latter to said fluidized-bed furnace (6), andh) moving said particulate in said fluidized-bed furnace (6) in such a way that said particulate material in the furnace itself moves in a direction towards said first combustion zone (2,3;14) and towards the place where the material from the first combustion zone falls onto the bed such that large objects can be removed immediately after falling onto the bed.
- Method according to claim 7, characterized bya) for said first combustion zone using a furnace with a grate (3), andb) using means below said grate (3) for receiving material falling through the openings in said grate and transferring it to said second combustion zone (6).
- Method according to claim 7, characterized by for said first combustion zone using a rotary kiln (14).
- Method according to any one or any of the claims 7-9, characterized by introducing material not suitable for combustion in said first combustion zone (2,3;14) directly into said second combustion zone (6).
- Method according to any one or any of the claims 7-10 and comprising the incineration of flowable water-containing material, such as sludge from sewage or industrial processes, characterized by introducing said flowable material in a mannera) facilitating the inflow of solids to said first combustion zone (2,3;14), and/orb) reducing the temperature on said grate (3), and/orc) reducing the temperature in said fluidized-bed furnace (6).
- Method according to any one or any of the claims 7-11, characterized in that the pressure within the first and second combustion zones and spaces communicating directly therewith is kept below the pressure of the surrounding atmosphere.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DK1998/000112 WO1999049265A1 (en) | 1998-03-23 | 1998-03-23 | Method of incinerating waste material, and incinerator for carrying out the method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1066486A1 EP1066486A1 (en) | 2001-01-10 |
EP1066486B1 true EP1066486B1 (en) | 2002-06-26 |
Family
ID=8156461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98914835A Expired - Lifetime EP1066486B1 (en) | 1998-03-23 | 1998-03-23 | Method of incinerating waste material, and incinerator for carrying out the method |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1066486B1 (en) |
AT (1) | ATE219829T1 (en) |
AU (1) | AU6918098A (en) |
DE (1) | DE69806273T2 (en) |
DK (1) | DK1066486T3 (en) |
WO (1) | WO1999049265A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT410287B (en) * | 2001-05-25 | 2003-03-25 | Tribovent Verfahrensentwicklg | DEVICE FOR THE PYROMETALLURGICAL PROCESSING OF WASTE MATERIALS |
RU2481528C2 (en) * | 2011-02-10 | 2013-05-10 | Общество с ограниченной ответственностью "Научно-технический центр Альтернативная энергетика" (ООО "НТЦ АЭ") | High-temperature plant for heat treatment of solid medical waste |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63194115A (en) * | 1987-02-04 | 1988-08-11 | Ishikawajima Harima Heavy Ind Co Ltd | Incinerator |
-
1998
- 1998-03-23 WO PCT/DK1998/000112 patent/WO1999049265A1/en active IP Right Grant
- 1998-03-23 DE DE69806273T patent/DE69806273T2/en not_active Expired - Lifetime
- 1998-03-23 AT AT98914835T patent/ATE219829T1/en not_active IP Right Cessation
- 1998-03-23 AU AU69180/98A patent/AU6918098A/en not_active Abandoned
- 1998-03-23 DK DK98914835T patent/DK1066486T3/en active
- 1998-03-23 EP EP98914835A patent/EP1066486B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DK1066486T3 (en) | 2002-10-14 |
DE69806273T2 (en) | 2003-02-06 |
ATE219829T1 (en) | 2002-07-15 |
AU6918098A (en) | 1999-10-18 |
DE69806273D1 (en) | 2002-08-01 |
WO1999049265A1 (en) | 1999-09-30 |
EP1066486A1 (en) | 2001-01-10 |
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