EP0513159A1 - A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied. - Google Patents
A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied.Info
- Publication number
- EP0513159A1 EP0513159A1 EP91903931A EP91903931A EP0513159A1 EP 0513159 A1 EP0513159 A1 EP 0513159A1 EP 91903931 A EP91903931 A EP 91903931A EP 91903931 A EP91903931 A EP 91903931A EP 0513159 A1 EP0513159 A1 EP 0513159A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coal
- fraction
- combustor
- paste
- transport
- 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
- 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
- F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/02—Mixing solid fuel with a liquid, e.g. preparing slurries
Definitions
- the invention relates to a method of supplying coal and sulphur absorbent to a combustor with combustion in a fluidized bed of particulate material. It is primarily intended for a plant with combustion of the coal at a pressure considerably above the atmospheric pressure, i.e. in a PFBC plant. PFBC are the initial letters of the expression Pressurized Fluidized Bed Combustion. The invention also relates to a power plant for application of the method.
- Coal and absorbent are crushed and mixed.
- a paste is prepared by the addition of water and possibly some emulsifying agent or oil which improves the transport properties of the paste. The past is pumped into the bed via nozzles .
- This method is used for coal with a high ash content and/or a high sulphur content . No addition of water, which reduces the efficiency, is necessary. However, energy-demanding drying of the crushed material is required to prevent moist fine-grained material to clog lock hopper and transport systems . Dry fine-grained pulverized coal also entails an explosion hazard which may require inert gas in the lock hopper system, which greatly increases both the investment and the operating costs .
- Coal is crushed and fed as a paste.
- Absorbent is crushed and fed in dry state.
- coal is crushed into a maximum grain size suitable for feeding into and combustion in a fluidized bed.
- This crushed coal is divided into a coarser and a finer fraction.
- the finer fraction suitably contains coal particles smaller than about 0.5-1.0 mm and the coarser fraction contains coal particles between about 0.5-1.0 mm and about 7 mm.
- This coarser coal fraction is supplied pneumatically to the combustor via a lock hopper system and nozzles, either separately or together with crushed sulphur absorbent . Because fine coal particles have been separated, the explosion hazard is eliminated in case of storage in pressurized containers and the risk of clogging of the transport devices is reduced in case of pneumatic transpor .
- a device described in Swedish patent application 8502301-8 may also be used.
- a paste is prepared by the addition of wate and possibly ah emulsifier or oil. Since paste is prepared only from a smaller amount of fuel, the addition of water in relation to the total fuel quantity, and hence the efficiency losses, are insignificant. Since paste is prepared only from fine ⁇ grained material, good pumpability of the paste may be obtained with a low water content since the paste is free from coarse particles which tend to sediment and cause clogging of conveying pipes .
- the need to achieve a well-balaced size distribution of the crushed material during the crushing is in all essentials eliminated, the crushing is simplified and the energy consumption for the crushing of the coal is reduced, the explosion hazard is reduced and the water supply to the combustor is insignificant and hence the efficiency losses by the water supply.
- the containers in the lock hopper system may be pressurized with air, and inert gas (which is very expensive) does not have to be used.
- Fuel nozzles may be placed relatively sparsely and within a limited region vertically near the air nozzles of the combustor bottom.
- 10 designates a combustor which is placed inside a pressure vessel 12.
- the space 13 is supplied with compressed combustion air from a compressor (not shown) via a conduit 14.
- the combustor 10 contains a fluidizable bed of particulate material 16, in which a fuel is burnt.
- the combustor 10 further accomodates tubes 18 for generation of steam for a steam turbine (not shown) and for cooling of the bed 16.
- Combustion gases leaving the bed 16 are collected in the freeboard 20, are conducted in the conduit 22 to a cleaning plant 24, symbolized by a cyclone 24, in which dust is separated, and from the cyclone the gases are forwarded in a conduit 26 to a gas turbine (not shown) .
- Fuel paste is pumped to the combustor via the conduit 30 and the nozzles 32.
- a coarser fuel fraction and sulphur absorbent are supplied to the combustor 10 via the conduit
- the combustor 10 is supplied with air from the space 13 via nozzles 38 for fluidization of the material in the bed 16 and combustion of the supplied fuel.
- Coal from a fuel storage 40 is crushed in a mill 42 and divided into a finer fraction 44 and a coarser fraction 46 in a screening plant 48.
- Sulphur absorbent from an absorbent storage 50 is crushed in a crusher 52.
- the coarse coal fraction 46 and the sulphur absorbent are transported pneumatically via the conduit 54 to a storage container 56 by means of transport gas from the compressor 58.
- Via a lock hopper system with the containers 62 and 64 and the valves 66 and 68 and a rotary vane feeder 70 coal and absorbent are fed to the conveying pipe 34 and further via the nozzles 36 into the bed.
- the transport gas consists of air which is taken from the pressure vessel 12 via the conduit 72. In the booster compressor 74 the pressure is increased.
- the container 62 in the lock hopper system 60 must be capable of being pressurized and pressure-relieved.
- the container 62 is connected to a pressure medium source (not shown) via a conduit 61 with a valve 63. Because of the absence of fine coal particles there is no explosion hazard and the container 62 need not be pressurized with inert gas but may be pressurized with air. This means a considerable advantage and simplification of the plant.
- the container 62 is connected to a conduit 65 with a valve 67.
- the conduit 65 leads to a space with atmospheric pressure.
- What should be considered larger and smaller particles is dependent on the type of coal and the shape the particles receive during the crushing operation.
- the boundary between large and small particles is set higher if the particles in the crushed material have the shape of flakes and are rich in gas than if they are more ball-shaped and poor in gas .
- the boundary between what should be regarded as small and large particles normally lies within the range 0.5-1.0 mm.
- the maximum size for large particles should usually not exceed about 7 mm.
- the finer coal fraction 44 is transported to a container 76, is mixed with water and possiby other additives and is prepared while being stirred with a stirrer 78 into a pumpable fuel paste 80.
- This paste 80 is pumped with a paste pump 82 via the conduit 30 and the nozzles 32 to the combustor 10.
- the finer coal fraction 44 may be transported to the container 76 by a mechanical transport device or, as shown in the figure, by a pneumatic transport device. In the latter case, one part of the screening plant is connected to the conveying pipe 8 .
- Propellent gas is obtained from the compressor 58. Coal and transport gas are separated in the cyclone 86 above the container 76 and fall down into this .
- the transport gas may be washed with water in a scrubber 88 so that dust remaining in the transport gas is removed.
- Transport gas for the coarse coal fraction 46 and for the absorbent may be conducted from the container 56 through the conduit 90 to the cyclone 86 and the scrubber 88 and be cleaned there.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
L'invention concerne un procédé permettant de fournir un produit absorbant le charbon et le soufre à un brûleur (10) avec combustion dans un lit fluidisé (16). Le charbon est broyé et séparé en morceaux fins et en morceaux gros. Les fins sont transformés en pâte en les mélangeant avec de l'eau, ou éventuellement de l'huile et/ou un émulsifiant. Ce mélange est injecté dans le lit (16) du brûleur (10) par l'intermédiaire de plusieurs premières buses (32). Les gros morceaux sont acheminés à l'état sec dans le brûleur par un moyen pneumatique soit directement, soit par l'intermédiaire d'un ou plusieurs systèmes de trémie verrouillable (60) et par plusieurs autres buses (36). Est également décrite une centrale électrique faisant appel à ce procédé.A method of supplying a carbon and sulfur absorbent to a burner (10) with combustion in a fluidized bed (16) is provided. The coal is crushed and separated into fine pieces and coarse pieces. The ends are made into a paste by mixing them with water, or possibly oil and/or an emulsifier. This mixture is injected into the bed (16) of the burner (10) via several first nozzles (32). The chunks are conveyed dry into the burner by pneumatic means either directly or through one or more lockable hopper systems (60) and several other nozzles (36). Also described is a power plant using this method.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9000354 | 1990-02-01 | ||
SE9000354A SE465536B (en) | 1990-02-01 | 1990-02-01 | SEAT AND DEVICE FOR SUPPLY OF COAL AND SULFUR ABSORBENT TO A FLUIDIZED BED |
PCT/SE1991/000063 WO1991011659A1 (en) | 1990-02-01 | 1991-01-29 | A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0513159A1 true EP0513159A1 (en) | 1992-11-19 |
EP0513159B1 EP0513159B1 (en) | 1995-04-26 |
Family
ID=20378423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91903931A Expired - Lifetime EP0513159B1 (en) | 1990-02-01 | 1991-01-29 | A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0513159B1 (en) |
JP (1) | JPH05504615A (en) |
AU (1) | AU7235591A (en) |
DE (1) | DE69109269T2 (en) |
DK (1) | DK0513159T3 (en) |
ES (1) | ES2074704T3 (en) |
FI (1) | FI101825B1 (en) |
SE (1) | SE465536B (en) |
WO (1) | WO1991011659A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9403568A0 (en) * | 1994-10-19 | 1996-04-20 | Abb Carbon Ab | Method and apparatus for feeding absorbent into a fluidized bed |
AT502048B1 (en) * | 2005-09-28 | 2007-01-15 | Himmelfreundpointner Kurt | Processing plant e.g. combustion furnace, charging method, involves introducing flowing process material into processing plant via conveyor line under pressure, and mixing flowing process material before its pressurization |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4259911A (en) * | 1979-06-21 | 1981-04-07 | Combustion Engineering, Inc. | Fluidized bed boiler feed system |
US4434726A (en) * | 1982-12-27 | 1984-03-06 | Combustion Engineering, Inc. | Fine particulate feed system for fluidized bed furnace |
-
1990
- 1990-02-01 SE SE9000354A patent/SE465536B/en not_active IP Right Cessation
-
1991
- 1991-01-29 DK DK91903931T patent/DK0513159T3/en active
- 1991-01-29 WO PCT/SE1991/000063 patent/WO1991011659A1/en active IP Right Grant
- 1991-01-29 ES ES91903931T patent/ES2074704T3/en not_active Expired - Lifetime
- 1991-01-29 DE DE69109269T patent/DE69109269T2/en not_active Expired - Fee Related
- 1991-01-29 AU AU72355/91A patent/AU7235591A/en not_active Abandoned
- 1991-01-29 EP EP91903931A patent/EP0513159B1/en not_active Expired - Lifetime
- 1991-01-29 JP JP50402991A patent/JPH05504615A/en active Pending
-
1992
- 1992-07-28 FI FI923409A patent/FI101825B1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO9111659A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69109269T2 (en) | 1996-01-11 |
AU7235591A (en) | 1991-08-21 |
JPH05504615A (en) | 1993-07-15 |
SE465536B (en) | 1991-09-23 |
FI923409A0 (en) | 1992-07-28 |
SE9000354D0 (en) | 1990-02-01 |
DE69109269D1 (en) | 1995-06-01 |
DK0513159T3 (en) | 1995-10-02 |
FI923409A (en) | 1992-07-28 |
EP0513159B1 (en) | 1995-04-26 |
FI101825B (en) | 1998-08-31 |
WO1991011659A1 (en) | 1991-08-08 |
FI101825B1 (en) | 1998-08-31 |
SE9000354L (en) | 1991-08-02 |
ES2074704T3 (en) | 1995-09-16 |
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