EP0828970A1 - Separation process and device - Google Patents
Separation process and deviceInfo
- Publication number
- EP0828970A1 EP0828970A1 EP96914005A EP96914005A EP0828970A1 EP 0828970 A1 EP0828970 A1 EP 0828970A1 EP 96914005 A EP96914005 A EP 96914005A EP 96914005 A EP96914005 A EP 96914005A EP 0828970 A1 EP0828970 A1 EP 0828970A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion chamber
- wall
- incinerator according
- chamber
- separating
- 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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0084—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed with recirculation of separated solids or with cooling of the bed particles outside the combustion bed
-
- 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
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
-
- 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
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the 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
- F23G5/30—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
- F23G2203/00—Furnace arrangements
- F23G2203/50—Fluidised bed furnace
- F23G2203/501—Fluidised bed furnace with external recirculation of entrained bed material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/20—Intercepting solids by baffles
Definitions
- the invention relates to a method for separating the bed material and to increasing the heat transfer in an incinerator based on the principle of a circulating fluidized bed and an incinerator for carrying out the method in fin tube construction based on the principle of a circulating fluidized bed with a separating and recycling device arranged in parallel to the combustion chamber for separation and returning the bed material to the combustion chamber, in particular in a self-supporting construction.
- cyclones such as partly uncooled, tapped cyclones
- the heat-storing particles which are carried by the flue gas stream, are largely separated out and therefore no longer contribute to the heat exchange in the downstream heating surfaces.
- This cyclone construction is also heavy, space-consuming and, despite the costly insulation of the sheet metal construction, exhibits considerable heat loss due to radiation. This design requires considerable start-up times.
- the object of the invention is to overcome the disadvantages mentioned, to reduce the space requirement and to integrate the separation system into the cooled part of the steam boiler construction.
- the size and the heat loss are reduced partly by reducing the surface area and partly by integrating the separator into the cooling circuit of the steam generator, so that the efficiency is also improved.
- the simple structure of the separator makes it easy to manufacture it from fin tube walls.
- the construction according to the invention enables the start-up times to be shortened due to the steel construction and the reduced mass, in particular the insulation.
- the design according to the invention enables the cooled design of the separation chamber and the bed return in an economical and simple manner.
- the integration of the separator, or its wall, in the boiler construction thus also increases the strength of the boiler body and thus the overall construction.
- the method is characterized in that the flue gas stream with the bed material and dust carried along is led into a shaft in the direction of gravity after the combustion chamber and at the end of the shaft there is a deflection against the direction of gravity with an expanding shaft cross section, whereby the entraining force of the flue gas is reduced and the coarse material falls down and gets back into the combustion chamber, while the flue gas with the remaining fine bed material is led to the downstream heating surfaces and there releases heat to the heating surfaces, in particular by radiation and / or convection.
- the incinerator for carrying out the method is characterized in that, in addition to the upper part of the combustion chamber, a separating device with low separation efficiency is provided in the form of a flue gas deflection, to which the return for the coarse bed material is connected.
- Embodiments of the invention are specified in subclaims 3 to 16.
- the combustion chamber 1 shows the upper part of a combustion chamber 1 of a steam generator with a deflection wall 14.
- the combustion chamber 1 with the intermediate wall 3, rear wall 4, the side walls 5 and 6 and the rear wall 7 form the boiler body as a static unit.
- the angled deflection wall 14 forms part of the combustion chamber ceiling and divides the separation chamber 2 into two parts, through which the exhaust gas from the combustion chamber 1 flows in succession.
- the front wall 3 or the two side walls 5 and 6 can also be formed as an intermediate wall with a connected deflection wall 14, as a result of which the Wi ⁇ el layer properties improve still further.
- the deflection wall 14 and its lower header 12 are equipped at least on the upstream side with a wear layer 15, while the rear of the deflection wall 14 and all other boundary walls of the separation chamber 2 are covered with a thin wear layer or left blank for better heat absorption.
- the separation chamber 2 is formed by the rear wall 7, parts of the side walls 5 and 6 and the intermediate wall 4.
- the weakly heated rear wall 7 is designed as part of the downpipe system and is used to supply cooling water to the riser system, which is essentially formed by the walls of the combustion chamber 1, the deflection wall 14 also being integrated into the riser system.
- the fin tubes of the deflection wall 14 are fed by separate collectors 12, which are connected to the steam drum 16 by the downpipe system. Masonry partitions are thus avoided.
- the combustion is carried out according to the principle of the circulating fluidized bed, in which the flue gas produced discharges bed material, such as ash, sand and fuel, upwards from the combustion chamber 1.
- bed material such as ash, sand and fuel
- the coarser solids content is separated from the flue gas with the arrangement according to the invention of a deflection wall 14 and again the Combustion chamber 1 supplied.
- the path of the bed material is indicated by dashed arrows and the path of the flue gas by solid line arrows.
- the solid content is due to its much higher density compared to the flue gas in the deflection over the upper edge 13 of the intermediate wall 4 by the centrifugal force to the outside and in the second deflection in the region of the lower end of the deflection wall 14 down towards the return device 9 and thus separated from the flue gas flow.
- the mainly larger solid particles braked or deflected on the deflection wall 14 fall in the separation chamber 2 due to the upward deflected flue gas flow and are thereby deflected in part by the flow velocity onto the rear wall 7 which is bent in the direction of the return device 9 and the collecting shaft 11 or also fed to a storage space 10 and the feedback device 9.
- the separating chamber 2 is designed so that the larger solid parts cannot take part in the sharp 180 ° deflection of the flue gas flow and the reduction in the flue gas speed due to the higher inertia forces.
- Finer particles which are redirected and discharged by the flue gas into the second draft, contribute to the heat exchange in the heating surfaces. Due to the small grain diameter of the finer material, there is no erosion in the heating surfaces downstream.
- the separated material is returned via a siphon-like return device 9, as shown in FIG. 1, or via an L valve or an overflow weir.
- the return device 9 expediently opens into the combustion chamber 1 at about half the height of the combustion chamber, as indicated in the two figures, the bed material being returned to the actual fluidized bed by the downward wall flow.
- the separated material slips freely into the combustion chamber 1 and falls along the intermediate wall 4 into the lower part of the combustion chamber.
- the return device 9 can, however, also be arranged only in the vicinity of the combustion chamber where the bed material is returned from the combustion chamber 1 through the separation chamber 2 into the combustion chamber 1 via a suitable sealing member to prevent bypass flows.
- An essential feature of the invention is that both the combustion chamber 1 and the separation chamber 2 are rectangular or square.
- the incorporation of the deflection wall 14 in the boiler construction thus also increases the strength of the overall unit. Due to the simple construction of the deflecting wall 14 and the square or rectangular design of the separation chamber 2, these components can be manufactured using the same methods as all other walls and can also be easily integrated into the boiler body. This design enables the cooled design of the separator and the bed material return in an economical and simple manner.
- the boiler can be stretched in height and width and, on the other hand, a symmetrical design with two separating chambers 2 is possible, in that the deflecting wall 14 is divided in two and a part as shown on the rear wall 4 and the other part on the intermediate wall 3, which like that Rear wall 4 is formed, is arranged.
- the flue gas extraction, or the arrangement of the secondary heating surfaces, then takes place transversely to the drawing plane, possibly symmetrically back and forth.
- This symmetrical design gives the building greater stability, so that the maximum output can be increased.
Landscapes
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Physical Vapour Deposition (AREA)
- External Artificial Organs (AREA)
- Compounds Of Unknown Constitution (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT9439/55 | 1995-06-02 | ||
AT94395 | 1995-06-02 | ||
AT943955 | 1995-06-02 | ||
PCT/AT1996/000100 WO1996038689A1 (en) | 1995-06-02 | 1996-05-31 | Separation process and device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0828970A1 true EP0828970A1 (en) | 1998-03-18 |
EP0828970B1 EP0828970B1 (en) | 2000-04-26 |
Family
ID=3503410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96914005A Expired - Lifetime EP0828970B1 (en) | 1995-06-02 | 1996-05-31 | Separation process and device |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0828970B1 (en) |
AT (1) | ATE192223T1 (en) |
AU (1) | AU5755096A (en) |
CZ (1) | CZ292939B6 (en) |
DE (1) | DE59605060D1 (en) |
DK (1) | DK0828970T3 (en) |
PL (1) | PL179911B1 (en) |
SK (1) | SK282507B6 (en) |
WO (1) | WO1996038689A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19604565A1 (en) * | 1996-02-08 | 1997-08-14 | Abb Patent Gmbh | Separating device for separating solid particles from the gas stream of a fluidized bed |
FR2880102B1 (en) * | 2004-12-28 | 2007-05-04 | Thel Etb Sarl | BIOMASS COMBUSTION DEVICE WITH FLUIDIZED BED |
CN103574591B (en) * | 2013-11-27 | 2016-03-30 | 陈洁 | A kind of Dual-furnace-body type rotary combustion furnace |
FI130171B (en) * | 2020-12-09 | 2023-03-27 | Sumitomo SHI FW Energia Oy | A circulating fluidized bed boiler |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3440583A1 (en) * | 1984-11-07 | 1986-05-07 | Buderus Ag, 6330 Wetzlar | Steam or hot-water generator |
JPH01184301A (en) * | 1988-01-19 | 1989-07-24 | Mitsubishi Heavy Ind Ltd | Circulating fluidized bed type boiler |
DK633488D0 (en) * | 1988-11-11 | 1988-11-11 | Risoe Forskningscenter | REACTOR |
JP2835895B2 (en) * | 1992-04-17 | 1998-12-14 | 株式会社荏原製作所 | Split-type fluidized-bed water tube boiler |
-
1996
- 1996-05-31 WO PCT/AT1996/000100 patent/WO1996038689A1/en active IP Right Grant
- 1996-05-31 DK DK96914005T patent/DK0828970T3/en not_active Application Discontinuation
- 1996-05-31 EP EP96914005A patent/EP0828970B1/en not_active Expired - Lifetime
- 1996-05-31 PL PL96323670A patent/PL179911B1/en unknown
- 1996-05-31 AU AU57550/96A patent/AU5755096A/en not_active Abandoned
- 1996-05-31 DE DE59605060T patent/DE59605060D1/en not_active Expired - Lifetime
- 1996-05-31 SK SK1624-97A patent/SK282507B6/en not_active IP Right Cessation
- 1996-05-31 AT AT96914005T patent/ATE192223T1/en active
- 1996-05-31 CZ CZ19973740A patent/CZ292939B6/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9638689A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0828970B1 (en) | 2000-04-26 |
CZ9703740A3 (en) | 2001-10-17 |
ATE192223T1 (en) | 2000-05-15 |
DK0828970T3 (en) | 2000-09-25 |
DE59605060D1 (en) | 2000-05-31 |
SK282507B6 (en) | 2002-10-08 |
WO1996038689A1 (en) | 1996-12-05 |
AU5755096A (en) | 1996-12-18 |
PL179911B1 (en) | 2000-11-30 |
CZ292939B6 (en) | 2004-01-14 |
PL323670A1 (en) | 1998-04-14 |
SK162497A3 (en) | 1998-05-06 |
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