EP0981018A1 - Fluidized bed combustion boiler - Google Patents
Fluidized bed combustion boiler Download PDFInfo
- Publication number
- EP0981018A1 EP0981018A1 EP98202767A EP98202767A EP0981018A1 EP 0981018 A1 EP0981018 A1 EP 0981018A1 EP 98202767 A EP98202767 A EP 98202767A EP 98202767 A EP98202767 A EP 98202767A EP 0981018 A1 EP0981018 A1 EP 0981018A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bottom plate
- combustion
- fluidized bed
- cooling element
- boiler
- 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.)
- Withdrawn
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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
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/26—Biowaste
- F23G2209/261—Woodwaste
Definitions
- the present invention relates to a fluidized bed combustion boiler comprising a combustion chamber with in its lower part a bottom plate with openings, which bottom plate is destined for carrying a fluid bed, such a sand bed, thereon, a burner for providing combustion air, a combustion air pipe for transporting the combustion air, which combustion air pipe comprises whirl pipes, which extend through the openings in the bottom plate, a cooling element placed at a distance over the bottom plate, which cooling element comprises a number of cooling pipes for the bottom plate of a cooling agent, a dosage system for dosing the fuel to the combustion chamber.
- Such a fluidized bed combustion boiler has been used for quite some time for combusting coals for for instance supplying steam or hot water.
- Such a boiler can also be used as pre-heater or as main boiler.
- a combustion boiler is highly suitable from an environmental point of view.
- a broader use of a combustion boiler, for instance by also combusting wood, however, has not been possible up until now.
- the small weight of wood in relation to coal plays a part here, because of which the combustion of the wood mainly takes place in the upper part of the fluid bed and even above it, and the fact that wood supplied to the boiler may have strongly varying humidity contents.
- a constant and protracted combustion of wood in a known fluidized bed appeared not to be possible.
- a combustion boiler of the kind described above according to the present invention is characterized in that the fluidized bed combustion boiler is provided with temperature measuring means for measuring the temperature of the fluid bed and for providing measuring signals, with movement means for changing the distance between the cooling element and the bottom plate by moving the cooling element, and with control means for receiving the measuring signals and for controlling the movement means in reaction to the measuring signals.
- the invention is based on the insight that as a result of the small weight and the inconstant degree of humidity of wood, the temperature of the fluid bed, for instance a sand bed, is not constant enough to have the known fluidized bed combustion boiler function well.
- FIG 1 a known fluidized bed combustion boiler for combusting coal is schematically shown. As such a coal boiler is generally known, it will only be discussed in short hereafter.
- the combustion of coal in the known fluidized bed combustion boiler 1 takes place in a combustion chamber 2.
- a bottom plate 3 has been arranged, which has been provided with openings.
- a burner 5, for instance a natural gas or light oil burner, possibly provided with a ventilator 6, provides combustion air, which is transported to the combustion chamber 2 through a combustion air pipe.
- the combustion air pipe 7 comprises whirl pipes 8, which extend through the openings in the bottom plate 3.
- a cooling element 9 is placed at a distance over the bottom plate 3, and contains a number of cooling pipes for containing a cooling agent, such as for instance water.
- a dosage system 10 doses coal to the combustion chamber 3.
- the hot flue gasses are blown through the pipes 8, so that the sand is brought in whirling turbulence and heated.
- the sand here reaches beyond the cooling element.
- coal is introduced in doses into the sand bed 4.
- the coal reach ignition so that the temperature rises further.
- the burner 5 is switched off and cold air is blown through the sand bed 4. Because of the combustion of the coal the temperature further rises up to about 850°C and this temperature is maintained in the sand bed 4. This is obtained by directly discharging heat via the cooling pipes, of which the heat transfer from the hot sand to the boiler water is very efficient.
- this known fluidized bed combustion boiler for coal is improved such that it is also suitable for combusting wood, in particular waste wood.
- Other fuels can also be combusted in the inventive fluidized bed combustion boiler.
- the fluidized bed combustion boiler 1' (see figure 2) of the present invention is provided with temperature measuring means 11, for instance a thermistor, for measuring the temperature of the sand bed 4' carried by the bottom plate 3'.
- the temperature measuring means 11 provide measuring signals that are representative of the temperature, and transfer these measuring signals to the control means 13 via a line 12.
- Movement means 14 and 15 are present for changing the distance between the cooling element 9' and the bottom plate 3', by moving the cooling element 9'.
- the control means 13 are connected to the movement means 14 and 15, respectively.
- the control means 13 receive the measuring signals from the temperature measuring means 11 and control the movement means 14 and 15 in reaction to the measuring signals.
- the movement means 14, 15 are controlled such that the cooling element 9' is moved upwards step by step until the wanted temperature value is reached again.
- This flexible connection can be realized by tubes, and is schematically shown in figure 2 by the lines 18 and 19.
- the movement means 14, 15 preferably each contain a piston rod 20 (see figure 3) which is connected with one end to the cooling element and with the other end to the so-called solid world of the boiler 1'.
- the piston rods 20 may be driven hydraulically, pneumatically or electrically, for instance by means of spindle engines.
Abstract
Fluidized bed combustion boiler comprising a combustion chamber (2)
with in its lower part a bottom plate (3) with openings. The bottom
plate is destined for carrying a fluid bed, such a sand bed (4),
thereon. A burner (5) is present for providing combustion air, which is
transported through a combustion air pipe (7). The combustion air pipe
comprises whirl pipes (8), which extend through the openings in the
bottom plate. A cooling element (9) is placed at a distance over the
bottom plate and comprises a number of cooling pipes for containing a
cooling agent, such as water. A dosage system (10) doses the fuel,
preferably wood, to the combustion chamber. The fluidized bed combustion
boiler is further provided with temperature measuring means for
measuring the temperature of the fluid bed and for providing measuring
signals. Movement means change the distance between the cooling element
and the bottom plate by moving the cooling element. Control means
receive the measuring signals and control the movement means in reaction
to the measuring signals.
Description
- The present invention relates to a fluidized bed combustion boiler comprising a combustion chamber with in its lower part a bottom plate with openings, which bottom plate is destined for carrying a fluid bed, such a sand bed, thereon, a burner for providing combustion air, a combustion air pipe for transporting the combustion air, which combustion air pipe comprises whirl pipes, which extend through the openings in the bottom plate, a cooling element placed at a distance over the bottom plate, which cooling element comprises a number of cooling pipes for the bottom plate of a cooling agent, a dosage system for dosing the fuel to the combustion chamber.
- Such a fluidized bed combustion boiler has been used for quite some time for combusting coals for for instance supplying steam or hot water. Such a boiler can also be used as pre-heater or as main boiler. Exactly because of the small emissions of furnace gasses such as NOx and SO2 a combustion boiler is highly suitable from an environmental point of view. A broader use of a combustion boiler, for instance by also combusting wood, however, has not been possible up until now. In particular the small weight of wood in relation to coal plays a part here, because of which the combustion of the wood mainly takes place in the upper part of the fluid bed and even above it, and the fact that wood supplied to the boiler may have strongly varying humidity contents. As a result of this a constant and protracted combustion of wood in a known fluidized bed appeared not to be possible.
- It is an object of the present invention to provide a fluidized bed combustion boiler with which it is possible among others to combust wood in a correct manner.
- For that purpose a combustion boiler of the kind described above according to the present invention is characterized in that the fluidized bed combustion boiler is provided with temperature measuring means for measuring the temperature of the fluid bed and for providing measuring signals, with movement means for changing the distance between the cooling element and the bottom plate by moving the cooling element, and with control means for receiving the measuring signals and for controlling the movement means in reaction to the measuring signals. The invention is based on the insight that as a result of the small weight and the inconstant degree of humidity of wood, the temperature of the fluid bed, for instance a sand bed, is not constant enough to have the known fluidized bed combustion boiler function well. By changing the place of the cooling element, which is located in the sand bed during use of the boiler, in reaction to the temperature of the sand bed, according to the invention a sufficiently constant temperature of the sand bed can be obtained for efficiently and correctly combusting wood, in particular waste wood, and other fuels.
- Some embodiments of a fluidized bed combustion boiler according to the present invention will, by way of example, be described on the basis of the drawing, in which:
- Figure 1 schematically shows a known fluidized bed combustion boiler for combusting coal;
- Figure 2 schematically shows a fluidized bed combustion boiler according to the invention for combusting in particular waste wood;
- Figure 3 schematically shows a part of a movement means of the fluidized bed combustion boiler of figure 2.
-
- In figure 1 a known fluidized bed combustion boiler for combusting coal is schematically shown. As such a coal boiler is generally known, it will only be discussed in short hereafter.
- The combustion of coal in the known fluidized
bed combustion boiler 1 takes place in acombustion chamber 2. In the lower part of this combustion chamber 2 abottom plate 3 has been arranged, which has been provided with openings. At the start of the combustion process a fluid bed, such as asand bed 4 lies on thebottom plate 3. Aburner 5, for instance a natural gas or light oil burner, possibly provided with aventilator 6, provides combustion air, which is transported to thecombustion chamber 2 through a combustion air pipe. Thecombustion air pipe 7 compriseswhirl pipes 8, which extend through the openings in thebottom plate 3. Acooling element 9 is placed at a distance over thebottom plate 3, and contains a number of cooling pipes for containing a cooling agent, such as for instance water. Adosage system 10 doses coal to thecombustion chamber 3. - During use of the coal boiler the hot flue gasses are blown through the
pipes 8, so that the sand is brought in whirling turbulence and heated. The sand here reaches beyond the cooling element. At a temperature of about 550°C coal is introduced in doses into thesand bed 4. The coal reach ignition so that the temperature rises further. When thesand bed 4 has reached a temperature of about 750°C theburner 5 is switched off and cold air is blown through thesand bed 4. Because of the combustion of the coal the temperature further rises up to about 850°C and this temperature is maintained in thesand bed 4. This is obtained by directly discharging heat via the cooling pipes, of which the heat transfer from the hot sand to the boiler water is very efficient. - According to the present invention this known fluidized bed combustion boiler for coal is improved such that it is also suitable for combusting wood, in particular waste wood. Other fuels can also be combusted in the inventive fluidized bed combustion boiler.
- For that purpose the fluidized bed combustion boiler 1' (see figure 2) of the present invention is provided with temperature measuring means 11, for instance a thermistor, for measuring the temperature of the sand bed 4' carried by the bottom plate 3'. The temperature measuring means 11 provide measuring signals that are representative of the temperature, and transfer these measuring signals to the control means 13 via a
line 12. Movement means 14 and 15 are present for changing the distance between the cooling element 9' and the bottom plate 3', by moving the cooling element 9'. By means oflines lines - The movement means 14, 15 preferably each contain a piston rod 20 (see figure 3) which is connected with one end to the cooling element and with the other end to the so-called solid world of the boiler 1'. The
piston rods 20 may be driven hydraulically, pneumatically or electrically, for instance by means of spindle engines.
Claims (2)
- Fluidized bed combustion boiler comprising a combustion chamber with in its lower part a bottom plate with openings, which bottom plate is destined for carrying a fluid bed, such a sand bed, thereon, a burner for providing combustion air, a combustion air pipe for transporting the combustion air, which combustion air pipe comprises whirl pipes, which extend through the openings in the bottom plate, a cooling element placed at a distance over the bottom plate, which cooling element comprises a number of cooling pipes for containing a cooling agent, a dosage system for dosing the fuel to the combustion chamber, characterized in that, the fluidized bed combustion boiler is provided with temperature measuring means for measuring the temperature of the fluid bed and for providing measuring signals, with movement means for changing the distance between the cooling element and the bottom plate by moving the cooling element, and with control means for receiving the measuring signals and for controlling the movement means in reaction to the measuring signals.
- Fluidized bed combustion boiler according to claim 1,
characterized in that, the dosage system for dosing the fuel to the combustion chamber is a dosage system for dosing wood, in particular waste wood.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98202767A EP0981018A1 (en) | 1998-08-19 | 1998-08-19 | Fluidized bed combustion boiler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98202767A EP0981018A1 (en) | 1998-08-19 | 1998-08-19 | Fluidized bed combustion boiler |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0981018A1 true EP0981018A1 (en) | 2000-02-23 |
Family
ID=8234045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98202767A Withdrawn EP0981018A1 (en) | 1998-08-19 | 1998-08-19 | Fluidized bed combustion boiler |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0981018A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101861101A (en) * | 2007-03-22 | 2010-10-13 | 玛丽·B·克拉夫特 | Tofu prepper |
EP2378854A1 (en) | 2008-11-20 | 2011-10-26 | Biomass Heating Solutions Limited | A mushroom production process |
WO2013041764A3 (en) * | 2011-09-23 | 2013-08-08 | Metso Power Oy | A system for supporting a combustion boiler plant |
DE102012203080A1 (en) * | 2012-02-29 | 2013-08-29 | Siemens Aktiengesellschaft | Fluidized bed reactor |
WO2016122322A1 (en) | 2015-01-28 | 2016-08-04 | Drynovations B.V. | Energy generation plant as well as method for generating energy from wet biomass |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2025014A (en) * | 1978-05-10 | 1980-01-16 | Stal Laval Turbin Ab | Fluidisable Bed Combustion Chamber |
EP0081619A1 (en) * | 1981-12-10 | 1983-06-22 | GebràDer Sulzer Aktiengesellschaft | Apparatus for fluidised-bed heat transfer |
US4628833A (en) * | 1983-04-11 | 1986-12-16 | The Garrett Corporation | Fluid bed hog fuel dryer |
DE3833616A1 (en) * | 1987-10-01 | 1989-04-13 | Reinhard Ing Goeschl | Fluidised-bed furnace |
JPH03286908A (en) * | 1990-03-30 | 1991-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Fluidized bed boiler |
-
1998
- 1998-08-19 EP EP98202767A patent/EP0981018A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2025014A (en) * | 1978-05-10 | 1980-01-16 | Stal Laval Turbin Ab | Fluidisable Bed Combustion Chamber |
EP0081619A1 (en) * | 1981-12-10 | 1983-06-22 | GebràDer Sulzer Aktiengesellschaft | Apparatus for fluidised-bed heat transfer |
US4628833A (en) * | 1983-04-11 | 1986-12-16 | The Garrett Corporation | Fluid bed hog fuel dryer |
DE3833616A1 (en) * | 1987-10-01 | 1989-04-13 | Reinhard Ing Goeschl | Fluidised-bed furnace |
JPH03286908A (en) * | 1990-03-30 | 1991-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Fluidized bed boiler |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 016, no. 119 (M - 1225) 25 March 1992 (1992-03-25) * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101861101A (en) * | 2007-03-22 | 2010-10-13 | 玛丽·B·克拉夫特 | Tofu prepper |
EP2378854A1 (en) | 2008-11-20 | 2011-10-26 | Biomass Heating Solutions Limited | A mushroom production process |
CN102291985A (en) * | 2008-11-20 | 2011-12-21 | 拜奥马斯加热技术有限公司 | A poultry rearing process |
CN102291981A (en) * | 2008-11-20 | 2011-12-21 | 拜奥马斯加热技术有限公司 | A mushroom production process |
WO2013041764A3 (en) * | 2011-09-23 | 2013-08-08 | Metso Power Oy | A system for supporting a combustion boiler plant |
DE102012203080A1 (en) * | 2012-02-29 | 2013-08-29 | Siemens Aktiengesellschaft | Fluidized bed reactor |
US9480961B2 (en) | 2012-02-29 | 2016-11-01 | Siemens Aktiengesellschaft | Fluidized bed reactor |
WO2016122322A1 (en) | 2015-01-28 | 2016-08-04 | Drynovations B.V. | Energy generation plant as well as method for generating energy from wet biomass |
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