WO2009093122A2 - Fluidised-bed combustion chamber with an anti-agglomerating system - Google Patents
Fluidised-bed combustion chamber with an anti-agglomerating system Download PDFInfo
- Publication number
- WO2009093122A2 WO2009093122A2 PCT/IB2009/000096 IB2009000096W WO2009093122A2 WO 2009093122 A2 WO2009093122 A2 WO 2009093122A2 IB 2009000096 W IB2009000096 W IB 2009000096W WO 2009093122 A2 WO2009093122 A2 WO 2009093122A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weight
- combustion chamber
- fluidised
- bed combustion
- bed
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/10001—Use of special materials for the fluidized bed
Definitions
- the present invention relates to a fluidised-bed combustion chamber with an anti-agglomerating system.
- a fluidised-bed combustion chamber substantially consists of a combustion chamber which contains a certain amount of inert material, normally sand, held in suspension by an ascending air current that also serves as info and is fed through a distribution grid placed on the bottom.
- the sand which is used for this purpose is usually of the river siliceous type, non- triturated and dry, and has an average granule size of 0.32 mm.
- the motion of the sand bed ensures an appropriate comburent-combustible contact, as well as ensuring a considerable temperature and mixing uniformity which contribute ⁇ to- ensure- a—constant—and—compl-ete-combusti-on-.--
- the material used as a combustible contains a high amount of alkaline metals (Na, K) , for instance vegetal combustibles. It has experimentally- been shown that the sand commonly used with this kind of combustibles tends to agglomerate, thus compromising the benefits deriving from the fluid bed.
- Na, K alkaline metals
- the siliceous sand comprises from 5 to 15% by weight of Fe 2 O 3 , from 2 to 5% by weight of CaO.
- the siliceous sand has the following composition in weight %: 58.7% SiO 2 , 27.9% Al 2 O 3 , 9.6% Fe 2 O 3 , 2.8% CaO.
- the following example is given by way of non- limitative illustration for a better understanding of the invention.
- siliceous sand which is the object of the present invention and, by comparison, a currently used siliceous sand have been tested for their tendency to agglomerate in the presence of vegetal combustibles.
- Table I respectively shows the compositions in weight % of the siliceous sand which is the object of the present invention (sand A) and of the compared siliceous sand (sand B) .
- Sand A object of the invention
- sand B comparative
- Table II shows the experimental results obtained as a function of the combustible used.
- the sand which is the object of the present invention when used with vegetal combustibles, ensures higher agglomeration starting temperatures and higher agglomeration times than those obtained with the known art sand.
- This behaviour of the sand which is the object of the present invention ensures that no agglomeration phenomena typical of the known art occur during normal operation of the fluidised-bed combustion chamber with vegetal combustibles .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
A f luidised-bed combustion chamber comprising a bed, the features of which avoid the phenomenon of agglomeration in the presence of combustibles with a high amount of alkaline metals. The bed is made with siliceous sand held in suspension by an ascending air current and comprising from 20 to 35 weight % of A12O3 and from 50 to 60 weight % of SiO2.
Description
FLUIDISED-BED COMBUSTION CHAMBER WITH AN ANTI- AGGLOMERATING SYSTEM
TECHNICAL FIELD The present invention relates to a fluidised-bed combustion chamber with an anti-agglomerating system.
BACKGROUND ART
A fluidised-bed combustion chamber substantially consists of a combustion chamber which contains a certain amount of inert material, normally sand, held in suspension by an ascending air current that also serves as carburant and is fed through a distribution grid placed on the bottom. The sand which is used for this purpose is usually of the river siliceous type, non- triturated and dry, and has an average granule size of 0.32 mm.
The motion of the sand bed ensures an appropriate comburent-combustible contact, as well as ensuring a considerable temperature and mixing uniformity which contribute~ to- ensure- a—constant—and—compl-ete-combusti-on-.--
Furthermore, in the fluidised-bed combustion chamber, an optimal combustion of the effluents is ensured by the free space above the bed in which the combustion of gases generated during the process takes place. These combustion features ensure low emissions and thus a low environmental impact. For these reasons, the use of the fluidised-bed combustion chamber has aroused a considerable interest both for waste disposal and for
cutting down pollutants in the exhaust fumes of other machineries .
Very often the material used as a combustible contains a high amount of alkaline metals (Na, K) , for instance vegetal combustibles. It has experimentally- been shown that the sand commonly used with this kind of combustibles tends to agglomerate, thus compromising the benefits deriving from the fluid bed.
DISCLOSURE OF INVENTION It is an object of the present invention to provide a fluidised-bed combustion chamber the technical features of which are such as to avoid the drawbacks of the known art .
It is an object of the present invention to provide a fluidised-bed combustion chamber comprising siliceous sand held in suspension by an ascending air current as a bed; said fluidised-bed combustion chamber being characterised in that said siliceous sand comprises from
20 to 35% by weight of Al2O3 and from 50 to 60% by weight of SiO2.
BEST MODE FOR CARRYING OUT THE INVENTION According to a preferred embodiment of the present invention the siliceous sand comprises from 5 to 15% by weight of Fe2O3, from 2 to 5% by weight of CaO. According to still another preferred embodiment of the present invention the siliceous sand has the following composition in weight %: 58.7% SiO2, 27.9% Al2O3, 9.6% Fe2O3, 2.8% CaO.
The following example is given by way of non- limitative illustration for a better understanding of the invention.
The siliceous sand which is the object of the present invention and, by comparison, a currently used siliceous sand have been tested for their tendency to agglomerate in the presence of vegetal combustibles.
Table I respectively shows the compositions in weight % of the siliceous sand which is the object of the present invention (sand A) and of the compared siliceous sand (sand B) .
Table I
Sand A (object of the invention) and sand B (comparison) have been tested for their tendency to agglomerate when used with combustibles. In particular, the tendency to agglomerate has been evaluated as a function of the measurements of the agglomeration starting temperature and of the agglomeration time.
Table II shows the experimental results obtained as a function of the combustible used. Table II
As is apparent from the results of Table II, the sand which is the object of the present invention, when used with vegetal combustibles, ensures higher agglomeration starting temperatures and higher agglomeration times than those obtained with the known art sand.
This behaviour of the sand which is the object of the present invention ensures that no agglomeration phenomena typical of the known art occur during normal operation of the fluidised-bed combustion chamber with vegetal combustibles .
Claims
1. A fluidised-bed combustion chamber comprising siliceous sand held in suspension by an ascending air current as a bed; said fluidised-bed combustion chamber being characterised in that said siliceous sand comprises from 20 to 35 weight % of AI2O3 and from 50 to 60 weight % of SiO2-
2. The fluidised-bed combustion chamber according to claim 1, characterised in that the siliceous sand comprises from 5 to 15 weight % of Fe2O3, from 2 to 5 weight % of CaO.
3. The fluidised-bed combustion chamber according to claim 2, characterised in that the siliceous sand has the following composition in weight percentages: 58.7% SiO2, 27.9% Al2O3, 9.6% Fe2O3, 2.8% CaO.
4. A siliceous sand to be used in a fluidised-bed combustion chamber characterised in that it comprises from 20 to 35 weight % of Al2O3 and from 50 to 60 weight % of SiO2.
5. The siliceous sand to be used in a fluidised-bed combustion chamber according to claim 4, characterised in that it comprises from 5 to 15 weight % of Fe2O3, from 2 to 5 weight % of CaO.
6. The siliceous sand to be used in a fluidised-bed combustion chamber according to claim 5, characterised in that it comprises from 58.7 weight % of SiO2, 27.9 weight % of Al2O3, 9.6 weight % of Fe2O3, 2.8 weight % of CaO.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO2008A000038 | 2008-01-22 | ||
ITBO20080038 ITBO20080038A1 (en) | 2008-01-22 | 2008-01-22 | FLUID BED COMBUSTOR WITH AN ANTI-GLUTING SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009093122A2 true WO2009093122A2 (en) | 2009-07-30 |
WO2009093122A3 WO2009093122A3 (en) | 2009-11-19 |
Family
ID=40289924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2009/000096 WO2009093122A2 (en) | 2008-01-22 | 2009-01-21 | Fluidised-bed combustion chamber with an anti-agglomerating system |
Country Status (2)
Country | Link |
---|---|
IT (1) | ITBO20080038A1 (en) |
WO (1) | WO2009093122A2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1456563A (en) * | 1974-06-20 | 1976-11-24 | Gvnii Str Materialov I Konstru | Fluidized-bed kiln for calcining mineral stock |
AU517419B2 (en) * | 1977-11-09 | 1981-07-30 | Energy Products Of Idaho | Fluidised bed incinerator |
US4771712A (en) * | 1987-06-24 | 1988-09-20 | A. Ahlstrom Corporation | Combustion of fuel containing alkalines |
WO2000023745A1 (en) * | 1998-10-16 | 2000-04-27 | Putkimaa Oy | Bed material for use in a combustion process |
-
2008
- 2008-01-22 IT ITBO20080038 patent/ITBO20080038A1/en unknown
-
2009
- 2009-01-21 WO PCT/IB2009/000096 patent/WO2009093122A2/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1456563A (en) * | 1974-06-20 | 1976-11-24 | Gvnii Str Materialov I Konstru | Fluidized-bed kiln for calcining mineral stock |
AU517419B2 (en) * | 1977-11-09 | 1981-07-30 | Energy Products Of Idaho | Fluidised bed incinerator |
US4771712A (en) * | 1987-06-24 | 1988-09-20 | A. Ahlstrom Corporation | Combustion of fuel containing alkalines |
WO2000023745A1 (en) * | 1998-10-16 | 2000-04-27 | Putkimaa Oy | Bed material for use in a combustion process |
Also Published As
Publication number | Publication date |
---|---|
WO2009093122A3 (en) | 2009-11-19 |
ITBO20080038A1 (en) | 2009-07-23 |
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