WO1991006807A1 - Method and apparatus for introducing solid material into a combustion or gasification reactor - Google Patents

Method and apparatus for introducing solid material into a combustion or gasification reactor Download PDF

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Publication number
WO1991006807A1
WO1991006807A1 PCT/FI1990/000246 FI9000246W WO9106807A1 WO 1991006807 A1 WO1991006807 A1 WO 1991006807A1 FI 9000246 W FI9000246 W FI 9000246W WO 9106807 A1 WO9106807 A1 WO 9106807A1
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WO
WIPO (PCT)
Prior art keywords
fuel
reactor
water
blowdown
solid material
Prior art date
Application number
PCT/FI1990/000246
Other languages
French (fr)
Inventor
Juhani Isaksson
Harry Ollila
Original Assignee
A. Ahlstrom Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by A. Ahlstrom Corporation filed Critical A. Ahlstrom Corporation
Publication of WO1991006807A1 publication Critical patent/WO1991006807A1/en

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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
    • 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
    • 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
    • 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
    • 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
    • F23C2206/10—Circulating fluidised bed
    • F23C2206/101—Entrained or fast fluidised bed

Definitions

  • the present invention relates to a method of introducing solid material, such as fuel or some other feed material of the process, into a combustion or gasification reactor in such a manner that either hot water or vaporizing water, serving as a medium, is mixed with the solid material in order to moisten said solid material prior to feeding thereof into the combustion chamber of the reactor and/or the solid material is dispersed and fed into the combustion chamber by means of said hot water or vaporizing water, serving as the medium.
  • solid material such as fuel or some other feed material of the process
  • the invention also relates to a reactor for combusting or gasifying solid material, the combustion chamber of the reactor being provided with means for supplying combustion air and means for feeding fuel.
  • the reactor is also provided with heat transfer surfaces for vaporizing of water, and the upper section of the reactor is provided with a steam drum having a blowdown line.
  • the invention is especially suitable for pressurized fluidized bed reactors in which solid fuel is combusted or gasified.
  • the solids required for gasification and combustion processes have to be fed undisturbed into the combustion chamber and in such a manner that the various substances are distributed as evenly as possible over the cross sectional area of the entire combustion chamber.
  • Feeding of dry, fine material, for example, into a pressurized combustion chamber calls for rather complicated equipment. Conveyance of dry material in the tubes prior to feeding it into the combustion chamber is both energy-consuming and difficult. For example, transfer of fine coal causes dusting and the fine coal itself is clearly explosive.
  • Finnish patent application 865217 discloses a method of mixing water with crushed coal. Water is mixed with crushed coal to such an extent as to form a pumpable mass. This coal paste may be pumped with a pump without any additional treatment directly to the combustion stage.
  • US patent 4,424,766 further discloses a method according to which, part of the steam generated on the heat transfer surfaces of the fluidized bed is conducted past the steam turbine and is utilized by the fuel feed pump when introducing fuel into the fluidized bed reactor.
  • An essential part of the boiler is a drum, which is in communication with the heat transfer surfaces. It is called a steam drum or a boiler drum and its task is steam separation.
  • the volume of the steam drum is divided almost equally among steam and boiler water.
  • Relatively unclean water or sludge is collected in the lowermost section of the steam drum. This unclean water or sludge contains, for example, rust from tubes and salt and humus which have entred the tubes with the feed water and then, little by little, accumulated in the boiler water.
  • this unclean water has to be discharged or blown down from the drum either continuously or intermittently.
  • Blowdown removes the sludge accumulated in the steam drum and regulates the salt and humus content of the boiler water.
  • the removed water is saturated water at the pressure of the boiler water.
  • the pressure of the boiler water ranges from 5 to 200 bar, whereby the temperature correspondinlgy ranges from 150 to 360°C.
  • blowdown boiler water Treatment of blowdown boiler water is problematic. Utilization of the relatively unclean removed water has usually not been possible because it should be cleaned prior to use. Therefore, the removed boiler water has simply been conducted to the sewer or exhausted directly to the atmosphere in the form of steam, which has been disadvantageous in terms of heat economy because the energy contained in the hot and pressurized boiler water has not been recovered. Furthermore, direct exhaust to the atmosphere makes noise which is harmful to the environment.
  • the Finnish patent application 875495 teaches the use of blowdown boiler water in cleaning of the heat transfer surfaces of the boiler. This takes place by directing a jet of boiler water on the heat transfer surfaces so as to clean them with sweepers.
  • An object of the present invention is to provide a new method and apparatus for utilizing the blowdown water of the boiler in combustion and gasification processes without the drawbacks described above.
  • Another object of the invention is to provide an improved method and apparatus for treating the feed material of the combustion or gasification process prior to feeding such feed material to a combustion or gasification reactor.
  • a still further object of the invention is to provide an improved method of introducing solid material into a combustion or gasification reactor.
  • the method according to the invention is characterized in that the blowdown water/exhaust steam from the steam drum of the reactor is used as the medium for moistening the solid material to be introduced into the combustion or gasification reactor and/or that the blowdown water/exhaust steam is used as the medium for dispersing solid material and distributing it to the combustion chamber.
  • the method according to the invention enables the utilization of relatively unclean, but still hot and pressurized blowdown water.
  • the blowdown water introduced into the combustion chamber need not be cleaned.
  • the salts or other contaminants contained in the blowdown water do not cause any problems in the process.
  • the method and apparatus according to the invention provide advantageous means for introducing, for example, coal into coal combustion reactors.
  • Blowdown water is mixed with crushed coal so as to make a suitable coal paste to be introduced into the combustion chamber.
  • Blowdown water may also be mixed with other solid material to be fed into the combustion chamber such as, for example, lime which is introduced into the process in order to bind sulphur from the flue gases.
  • water or steam received from elsewhere may additionally be mixed with the solid material if there is not enough blowdown water for provision of a suitable composition.
  • Blowdown water which vaporizes when pressure is reduced, may also be used advantageously for dispersing solid feed material, such as coal paste, in a feed nozzle.
  • solid feed material such as coal paste
  • the aqueous steam thus produced disperses the solid material and distributes it evenly to the combustion vessel.
  • the water or steam introduced into the combustion chamber together with solid material adds to the amount of gas to be conducted to the gas turbine in a pressurized process, thereby increasing the power generation of the gas turbine.
  • Fig. 1 is a schematic illustration of an embodiment of the invention.
  • Fig. 2 is a schematic enlargement of the steam drum shown in Fig. 1.
  • the present invention is applied to a pressurized, circulating fluidized bed reactor
  • the reactor comprises a pressure vessel 2, in which a combustion chamber 3 and a particle separator 4 are disposed.
  • the walls of the combustion chamber are tubular water walls or membrane walls 5, which serve as heat transfer surfaces recovering heat from the combustion chamber.
  • the heat transfer surfaces communicate with a steam drum 6 which is disposed in the upper section of the combustion chamber and in which steam drum the steam generated in a heat exchanger is separated from water.
  • a steam conduit 7 leads from the steam drum to a steam turbine, not shown in the figure.
  • an air box 8 is disposed, wherefrom the combustion air is supplied through a grid 9 into the lower section of the combustion chamber.
  • means 10 for dispersing solid material It is connected to the feed nozzle and introduces fuel and possibly some other feed material of the process into the combustion chamber.
  • a water/steam discharge pipe or blowdown line 11 leads from the steam drum to a mixing chamber 12, which is also provided with a fuel inlet pipe 13.
  • a mixing chamber 12 which is also provided with a fuel inlet pipe 13.
  • vaporizing water exhausted from the steam drum is mixed with the fuel in the mixing chamber.
  • a by-pass pipe 14 from the blowdown line 11 leads past the mixing chamber directly to the means 10 disposed in the fuel feed nozzle. Vaporizing water is led through the by- pass pipe into the means 10 to contribute to the dispersion of the fuel and distribution thereof into the combustion chamber.
  • the blowdown water may be led through pressure regulation means 17 into the mixing chamber and/or fuel dispersing means in the feed nozzle.
  • the blowdown water is also led through a heat exchanger 18, serving as the means for regulating temperature, into the mixing chamber for maintaining the paste at a suitable temperature.
  • a corresponding mixing chamber may be disposed in connection with the reactor, for moistening some other feed material of the process in order to produce a suitable composition for the feed.
  • Fig. 2 is an enlargement of the steam drum 6.
  • Water and steam each fills about half of the volume of the steam drum.
  • Unclean sludge is accumulated in the lowest section 19 of the steam drum.
  • the unclean sludge is formed by salts and other materials accumulating in the boiler water.
  • An end 20 of the blowdown line 11 is disposed in the lowermost spot of the steam drum. Thus, the unclean water is discharged from the steam drum through said blowdown line during the blowdown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

A method and apparatus for introducing fuel or some other solid material into a combustion or gasification boiler. The blowdown water from the steam drum of the boiler is used as the medium for moistening the solid material to be fed into the boiler prior to the feed and/or as the medium, in the feed nozzles, for dispersing and distributing the material into the boiler.

Description

Method and apparatus for introducing solid material into a combustion or gasification reactor
The present invention relates to a method of introducing solid material, such as fuel or some other feed material of the process, into a combustion or gasification reactor in such a manner that either hot water or vaporizing water, serving as a medium, is mixed with the solid material in order to moisten said solid material prior to feeding thereof into the combustion chamber of the reactor and/or the solid material is dispersed and fed into the combustion chamber by means of said hot water or vaporizing water, serving as the medium.
The invention also relates to a reactor for combusting or gasifying solid material, the combustion chamber of the reactor being provided with means for supplying combustion air and means for feeding fuel. The reactor is also provided with heat transfer surfaces for vaporizing of water, and the upper section of the reactor is provided with a steam drum having a blowdown line.
The invention is especially suitable for pressurized fluidized bed reactors in which solid fuel is combusted or gasified.
The solids required for gasification and combustion processes have to be fed undisturbed into the combustion chamber and in such a manner that the various substances are distributed as evenly as possible over the cross sectional area of the entire combustion chamber. Feeding of dry, fine material, for example, into a pressurized combustion chamber calls for rather complicated equipment. Conveyance of dry material in the tubes prior to feeding it into the combustion chamber is both energy-consuming and difficult. For example, transfer of fine coal causes dusting and the fine coal itself is clearly explosive.
To avoid the above-mentioned drawbacks, moistening of coal prior to feeding thereof into the combustion chamber has been suggested. Finnish patent application 865217 discloses a method of mixing water with crushed coal. Water is mixed with crushed coal to such an extent as to form a pumpable mass. This coal paste may be pumped with a pump without any additional treatment directly to the combustion stage.
US patent 4,424,766 further discloses a method according to which, part of the steam generated on the heat transfer surfaces of the fluidized bed is conducted past the steam turbine and is utilized by the fuel feed pump when introducing fuel into the fluidized bed reactor.
An essential part of the boiler is a drum, which is in communication with the heat transfer surfaces. It is called a steam drum or a boiler drum and its task is steam separation. The volume of the steam drum is divided almost equally among steam and boiler water. Relatively unclean water or sludge is collected in the lowermost section of the steam drum. This unclean water or sludge contains, for example, rust from tubes and salt and humus which have entred the tubes with the feed water and then, little by little, accumulated in the boiler water.
To avoid clogging of the tubes, this unclean water has to be discharged or blown down from the drum either continuously or intermittently. Blowdown removes the sludge accumulated in the steam drum and regulates the salt and humus content of the boiler water. Usually about 1 to 5 % of the feed water of the boiler has to be removed. The removed water is saturated water at the pressure of the boiler water. The pressure of the boiler water ranges from 5 to 200 bar, whereby the temperature correspondinlgy ranges from 150 to 360°C.
Treatment of blowdown boiler water is problematic. Utilization of the relatively unclean removed water has usually not been possible because it should be cleaned prior to use. Therefore, the removed boiler water has simply been conducted to the sewer or exhausted directly to the atmosphere in the form of steam, which has been disadvantageous in terms of heat economy because the energy contained in the hot and pressurized boiler water has not been recovered. Furthermore, direct exhaust to the atmosphere makes noise which is harmful to the environment.
The Finnish patent application 875495 teaches the use of blowdown boiler water in cleaning of the heat transfer surfaces of the boiler. This takes place by directing a jet of boiler water on the heat transfer surfaces so as to clean them with sweepers.
An object of the present invention is to provide a new method and apparatus for utilizing the blowdown water of the boiler in combustion and gasification processes without the drawbacks described above.
Another object of the invention is to provide an improved method and apparatus for treating the feed material of the combustion or gasification process prior to feeding such feed material to a combustion or gasification reactor.
A still further object of the invention is to provide an improved method of introducing solid material into a combustion or gasification reactor.
To meet the objects described above, the method according to the invention is characterized in that the blowdown water/exhaust steam from the steam drum of the reactor is used as the medium for moistening the solid material to be introduced into the combustion or gasification reactor and/or that the blowdown water/exhaust steam is used as the medium for dispersing solid material and distributing it to the combustion chamber.
The reactor according to the invention is characterized in that the blowdown line from the steam drum is in communication
- with means in which the fuel and/or other solid material to be introduced into the reactor is moistened and/or
- with means for dispersing and feeding the fuel and/or other solid material into the reactor.
The method according to the invention enables the utilization of relatively unclean, but still hot and pressurized blowdown water. The blowdown water introduced into the combustion chamber need not be cleaned. The salts or other contaminants contained in the blowdown water do not cause any problems in the process.
The method and apparatus according to the invention provide advantageous means for introducing, for example, coal into coal combustion reactors. Blowdown water is mixed with crushed coal so as to make a suitable coal paste to be introduced into the combustion chamber. Blowdown water may also be mixed with other solid material to be fed into the combustion chamber such as, for example, lime which is introduced into the process in order to bind sulphur from the flue gases. To produce a suitable sludge or paste of solid material, water or steam received from elsewhere may additionally be mixed with the solid material if there is not enough blowdown water for provision of a suitable composition. When the present invention is applied in respect of gasifiers or boilers in which coal is gasified or combusted, water or steam is mixed with coal, preferably to such an extent as to produce a coal paste which is easy to treat and handle. Increasing the moisture of coal to 15 - 20 % facilitates its transportation by pumping even longer distances and enables simple feeding thereof even into a pressurized combustion chamber. Feeding of coal may be effected by fairly simple means. Raising the moisture content prevents dusting of coal and considerably reduces its susceptibility to explode.
Blowdown water, which vaporizes when pressure is reduced, may also be used advantageously for dispersing solid feed material, such as coal paste, in a feed nozzle. The aqueous steam thus produced disperses the solid material and distributes it evenly to the combustion vessel.
The water or steam introduced into the combustion chamber together with solid material adds to the amount of gas to be conducted to the gas turbine in a pressurized process, thereby increasing the power generation of the gas turbine.
The invention is furhter described in more detail in the following, by way of example, with reference to the accompanying drawings, in which
Fig. 1 is a schematic illustration of an embodiment of the invention, and
Fig. 2 is a schematic enlargement of the steam drum shown in Fig. 1.
In the embodiment of Fig. 1, the present invention is applied to a pressurized, circulating fluidized bed reactor
1. The reactor comprises a pressure vessel 2, in which a combustion chamber 3 and a particle separator 4 are disposed. The walls of the combustion chamber are tubular water walls or membrane walls 5, which serve as heat transfer surfaces recovering heat from the combustion chamber. The heat transfer surfaces communicate with a steam drum 6 which is disposed in the upper section of the combustion chamber and in which steam drum the steam generated in a heat exchanger is separated from water. A steam conduit 7 leads from the steam drum to a steam turbine, not shown in the figure.
In the lower section of the combustion chamber an air box 8 is disposed, wherefrom the combustion air is supplied through a grid 9 into the lower section of the combustion chamber. In the lower section of the combustion chamber is also disposed means 10 for dispersing solid material. It is connected to the feed nozzle and introduces fuel and possibly some other feed material of the process into the combustion chamber.
A water/steam discharge pipe or blowdown line 11 leads from the steam drum to a mixing chamber 12, which is also provided with a fuel inlet pipe 13. In order to produce fuel paste, vaporizing water exhausted from the steam drum is mixed with the fuel in the mixing chamber.
A by-pass pipe 14 from the blowdown line 11 leads past the mixing chamber directly to the means 10 disposed in the fuel feed nozzle. Vaporizing water is led through the by- pass pipe into the means 10 to contribute to the dispersion of the fuel and distribution thereof into the combustion chamber.
Either water or steam from elsewhere than the steam drum, whichever is needed, may be led through conduit 15 into the mixing chamber for producing a suitable fuel paste. Blowdown water may also be led through conduit 16 directly to the combustion chamber in case there is more water than needed for the fuel feed.
If necessary, the blowdown water may be led through pressure regulation means 17 into the mixing chamber and/or fuel dispersing means in the feed nozzle. Preferably the blowdown water is also led through a heat exchanger 18, serving as the means for regulating temperature, into the mixing chamber for maintaining the paste at a suitable temperature.
Besides the mixing chamber for the fuel paste, a corresponding mixing chamber may be disposed in connection with the reactor, for moistening some other feed material of the process in order to produce a suitable composition for the feed.
Fig. 2 is an enlargement of the steam drum 6. Water and steam each fills about half of the volume of the steam drum. Unclean sludge is accumulated in the lowest section 19 of the steam drum. The unclean sludge is formed by salts and other materials accumulating in the boiler water. An end 20 of the blowdown line 11 is disposed in the lowermost spot of the steam drum. Thus, the unclean water is discharged from the steam drum through said blowdown line during the blowdown.
The invention is not intended to be limited to the embodiment of the example, but it can be modified and applied within the scope defined in the accompanying claims.

Claims

Claims
1. A method of introducing solid material, such as fuel or some other feed material of the process, into a combustion or gasification reactor in such a manner that either hot water or vaporizing water, serving as a medium, is mixed with the solid material in order to moisten said solid material prior to feeding thereof into the combustion chamber of the reactor, and/or the solid material is dispersed and fed into the combustion chamber by means of said hot water or vaporizing water, serving as the medium, characterized in that the medium is blowdown water/blowdown steam discharged from the steam drum of the reactor.
2. A method as claimed in claim 1, characterized in that the blowdown water from the steam drum is used as the medium for the production of the fuel paste to be introduced into a fluidized bed reactor.
3. A method as claimed in claim 2, characterized in that the blowdown water from the steam drum is used as the medium for production of the fuel paste to be introduced into a pressurized fluidized bed reactor.
4. A method as claimed in claim 2 or 3, characterized in that the temperature of the blowdown water is regulated by a heat exchanger to a level suitable for production of the fuel paste prior to mixing said blowdown water with the fuel.
5. A method as claimed in claim 1, characterized in that fuel to be introduced into the fluidized bed reactor is dispersed by means of blowdown water/blowdown steam.
6. A method as claimed in claim 5, characterized in that fuel is introduced into a pressurized fluidized bed reactor by means of blowdown water.
7. A method as claimed in claim 5 or 6, characterized in that the pressure of the blowdown steam is regulated by pressure regulating means to a level suitable for dispersing fuel.
8. A reactor for combusting or gasifying solid material, which reactor comprises a combustion chamber (3) provided with means (8) for supplying combustion air, means (10) for feeding fuel, and heat transfer surfaces (5) for vaporizing water, the upper section of said combustion chamber being provided with a steam drum having a blowdown line (11), characterized in that the blowdown line from the steam drum is in communication - with means in which the fuel and/or some other solid material to be introduced into the reactor is moistened and/or - with means for dispersing and feeding the fuel and/or other solid material into the reactor.
9. A reactor as claimed in claim 8, characterized in that the means (10) for feeding fuel is connected to the mixing chamber (12) in which blowdown water is mixed with fuel.
10. A reactor as claimed in claim 8, characterized in that the means (10) for dispersing fuel comprises a nozzle for dispersing the fuel to be fed into the combustion chamber by means of blowdown water.
11. A reactor as claimed in claim 8, characterized in that pressure regulating means (17) is disposed between the steam drum (6) and the means (10) for dispersing fuel.
12. A reactor as claimed in claim 8, characterized in that temperature regulating means (18) is disposed between the steam drum (6) and the means (10) for dispersing fuel.
PCT/FI1990/000246 1989-10-25 1990-10-19 Method and apparatus for introducing solid material into a combustion or gasification reactor WO1991006807A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI895055A FI83816C (en) 1989-10-25 1989-10-25 Method and apparatus for feeding solid material into a combustion or gasification reactor
FI895055 1989-10-25

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WO1991006807A1 true WO1991006807A1 (en) 1991-05-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009321A1 (en) * 1992-10-08 1994-04-28 Imatran Voima Oy Method and configuration for facilitating the fuel feed into a pressurized space
EP2175105A4 (en) * 2007-06-11 2015-05-20 Shanghai Waigaoqiao No 3 Power Generation Co Ltd A controlling method of a generator set provided with a bypass system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4424766A (en) * 1982-09-09 1984-01-10 Boyle Bede Alfred Hydro/pressurized fluidized bed combustor
US4714032A (en) * 1985-12-26 1987-12-22 Dipac Associates Pollution-free pressurized combustion utilizing a controlled concentration of water vapor
WO1990012253A1 (en) * 1989-04-13 1990-10-18 A. Ahlstrom Corporation Method and apparatus for recovering heat from solid material separated from gasification or combustion processes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4424766A (en) * 1982-09-09 1984-01-10 Boyle Bede Alfred Hydro/pressurized fluidized bed combustor
US4714032A (en) * 1985-12-26 1987-12-22 Dipac Associates Pollution-free pressurized combustion utilizing a controlled concentration of water vapor
WO1990012253A1 (en) * 1989-04-13 1990-10-18 A. Ahlstrom Corporation Method and apparatus for recovering heat from solid material separated from gasification or combustion processes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009321A1 (en) * 1992-10-08 1994-04-28 Imatran Voima Oy Method and configuration for facilitating the fuel feed into a pressurized space
GR930100388A (en) * 1992-10-08 1994-06-30 Imatran Voima Oy Method and configuration for facilitating the fuel feed into a pressurized space.
US5655466A (en) * 1992-10-08 1997-08-12 Imatran Voima Oy Method and configuration for facilitating the fuel feed into a pressurized space
EP2175105A4 (en) * 2007-06-11 2015-05-20 Shanghai Waigaoqiao No 3 Power Generation Co Ltd A controlling method of a generator set provided with a bypass system

Also Published As

Publication number Publication date
FI895055A0 (en) 1989-10-25
FI83816B (en) 1991-05-15
FI83816C (en) 1991-08-26

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