CN206001451U - A kind of air-distribution device of fluidized-bed combustion boiler and CFBB - Google Patents
A kind of air-distribution device of fluidized-bed combustion boiler and CFBB Download PDFInfo
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- CN206001451U CN206001451U CN201621041010.0U CN201621041010U CN206001451U CN 206001451 U CN206001451 U CN 206001451U CN 201621041010 U CN201621041010 U CN 201621041010U CN 206001451 U CN206001451 U CN 206001451U
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- choke zone
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 23
- 239000004744 fabric Substances 0.000 claims abstract description 66
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 31
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 12
- 239000000446 fuel Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
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- 239000003500 flue dust Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
This utility model provides a kind of air-distribution device of fluidized-bed combustion boiler and CFBB, have on described air-distribution device peripheral wind region (6) and by this peripheral wind region (6) around middle wind region, described periphery wind region (6) above and is each provided with least one cloth wind passage (2) on described middle wind region, is respectively provided with the throttling arrangement of configuration cloth wind air quantity in each described cloth wind passage of described middle wind region.Described air-distribution device is divided into different regions the air distribution plate above water cooled wind chamber, realizes the regulation of diverse location air quantity through different throttling process, thus reaching the purpose controlling bed temperature.
Description
Technical field
This utility model is related to boiler, in particular it relates to a kind of air-distribution device of fluidized-bed combustion boiler and recirculating fluidized bed pot
Stove.
Background technology
CFBB (CFB boiler) combustion technology is because its fuel tolerance is wide, direct desulfurization denitration, section in stove
The series of advantages the such as about energy, high combustion efficiency, load regulation rate be big and Load Regulation is fast and increasingly attracted attention by thermal technology circle.20
Since the eighties in century, Combustion technology of circulating fluidized is increasingly being used to electricity generation boiler with its high efficiency, oligosaprobic advantage.From
In the long run, CFB boiler meets coal resources in China, steam coal feature and the particularly thorny reality of coal-burning boiler environmental pollution
Border situation, is therefore increasingly paid attention in China is using the power plant of coal power generation inferior.
The fuel that is mainly characterized by that CFBB runs repeatedly circulates in stove with bed, and this provides for fuel
Enough tail-off times, unburned carbon in flue dust can be made to be greatly reduced, for the recirculating fluidized bed using exotic fuels, operational excellence
For boiler, efficiency of combustion, up to 98%~99%, is equivalent to the efficiency of combustion of pulverized coal firing boiler.CFBB is same
When also have the advantages that other forms boiler does not have and technical characterstic:(1) burning in CFBB belongs to low temperature combustion
Burn, therefore nitrogen oxide emission is far below coal-powder boiler, about 200ppm about;(2) fuel and desulfurizing agent circulate instead through multiple
Carry out low-temperature burning and desulphurization reaction again, can achieve direct desulfurization in combustion, desulfuration efficiency height and technical equipment economy
Simply, there is the good feature of environmental protection and economy;(3) fuel tolerance is wide and high combustion efficiency, and general combustion system is difficult to
The bone coal of normal combustion, coal grind the inferior fuels such as stone, mud coal, oil shale, low combustion value anthracite and various industrial refuse all may be used
With active combustion in CFBB;(4) the lime-ash activity discharged is good, it is easy to accomplish comprehensive utilization, no secondary lime-ash
Pollution;(5) load regulation range is big, and underload can drop to fully loaded 30% about.Therefore require increasingly tight in Environmental Protection in China
Lattice, power plant load range of accommodation is larger, coal is changeable, the direct combusted proportion of raw coal high, national economic development level is uneven, combustion
In the case of the contradiction of coal and environmental protection, development with Technology of Circulating Fluidized Bed Boiler and perfect, people will be become
The New combustion technique of first-selected high-efficiency and low-pollution.
Bed temperature is the important parameter of CFBC state, directly complicated combustion position affect to circulate in reflection stove
The heat transfer of material, can directly affect boiler safe and continuous runs.Bed temperature general control, in the range of 850~950 DEG C, selects
Main cause with this temperature is as follows:1. ash will not be melted at such a temperature, thus reducing the danger of slagging scorification;2. this bed
Temperature is the optimal reaction temperature of conventional limestone desulfurizer, can play the desulfurized effect of desulfurizing agent to greatest extent, effectively remove
Remove SO2, there is higher desulfuration efficiency;3. burn at such a temperature, in burning gases, nitride gas are less;4. in this temperature
Alkali metal in lower coal will not distil, and can reduce Boiler Heating Surfaces.Bed temperature is too high exceed grey deformation temperature can lead to high in stove
Warm coking, material cannot ciculation fluidized burn, and desulfurizing agent desulfurized effect declines;Bed temperature is too low coal grain is caught fire and burn unfavorable,
Efficiency of combustion declines, and boiler output declines, and boiler operatiopn is unstable, easily causes flame-out:Too high or too low bed temperature is also
Impact desulfuration efficiency and limestone consumption, so bed temperature has influence on the safety of whole boiler, economical operation, have influence on pot simultaneously again
The environmental effect that stove runs.
However, in bed temperature uphill process, the bed temperature of middle part is consistently higher than the bed temperature at both sides position, this is recycle stream
Change the significant characteristic of bed big breadth depth ratio list burner hearth.The reason produce this phenomenon is as follows:Slag-drip opening returns near returning charge mouth, returning charge mouth
Return is all fine ash, thus slag cooler discharge be also this region fine grained, big slag basic row do not go out, and occurs in bed
Bed particle diameter distribution uneven phenomenon, leads to bed fluidisation uneven, so that deviation in bed temperature;Additionally, upper boiler water cooled wind chamber
Using both sides air inlet, mid portion static pressure highest, blast cap flow velocity is maximum, leads to the especially thick material of intermediate material to flow to both sides,
So that middle bed thickness is reduced, temperature raises, and big slag all stays to both sides.Big slag stockpiles the bed voidage excessively making both sides
Increase, fluidisation are bad, thus reducing both sides bed temperature.Therefore it provides suitable bed temperature regulative mode is to CFBB
Most important.
Utility model content
The purpose of this utility model is to provide a kind of air-distribution device of fluidized-bed combustion boiler, and described air-distribution device is capable of not
With the regulation of position air quantity, thus efficiently controlling bed temperature.
To achieve these goals, this utility model provides a kind of air-distribution device of fluidized-bed combustion boiler, described cloth wind dress
Put have peripheral wind region and by this peripheral wind region around middle wind region, described periphery wind region on and described centre
At least one cloth wind passage is each provided with wind region, in each described cloth wind passage of described middle wind region, is respectively equipped with use
Throttling arrangement in configuration cloth wind air quantity.
According to an embodiment, described middle wind region is divided into middle weight choke zone and is located at this centre weight choke zone
The light choke zone of both sides, described middle weight choke zone and light choke zone are each disposed with described cloth wind passage, and described middle weight
The respective described throttling arrangement in choke zone and light choke zone is configured so that the cloth wind of the cloth wind passage of weight choke zone in the middle of described
Air quantity is less than the cloth wind air quantity of the cloth wind passage of described light choke zone.
According to an embodiment, described air-distribution device includes air distribution plate, this air distribution plate have with described periphery wind region,
Each described light choke zone and middle weight choke zone respectively corresponding outer cloth wind installation portion, light throttling cloth wind installation portion and in
Between throttle part installation portion again, described outer cloth wind installation portion, light throttling cloth wind installation portion and centre throttle part installation portion again
It is respectively arranged with the airduct of the thickness running through this air distribution plate, one end end of each described airduct is separately installed with blast cap, described
Blast cap has the wind distributing hole connecting with each self-corresponding described airduct, the pore of described airduct, the middle cavity of described blast cap and institute
State wind distributing hole and form described cloth wind passage.
According to an embodiment, it is provided with as described in the airduct of described middle weight choke zone and described light choke zone
In the throttle of throttling arrangement, and the airduct of described middle weight choke zone, the internal diameter of the throttle of setting is less than described light throttling
The internal diameter of the throttle of setting in the airduct in area;Described centre throttles cloth wind installation position in the middle part of described air distribution plate again, its face
Amass and account for the 25%~35% of the described air distribution plate gross area;The gross area of described light throttling cloth wind installation portion accounts for the total face of described air distribution plate
Long-pending 30%~40%;The gross area of described outer cloth wind installation portion accounts for the 25%~35% of the described air distribution plate gross area.
According to an embodiment, the throttle internal diameter of described middle weight choke zone be described airduct internal diameter 70%~
80%;The throttle internal diameter of described light choke zone is the 80%~90% of described airduct internal diameter.
According to an embodiment, the internal diameter of shown airduct is 53~55 millimeters, the throttle of described middle weight choke zone
Internal diameter be 39~41 millimeters, 44~47 millimeters of the internal diameter of throttle in described light choke zone.
Preferably, the internal diameter of described shown airduct is 54 millimeters, and the internal diameter of the throttle of described middle weight choke zone is 40
Millimeter, 45 millimeters of the internal diameter of throttle in described light choke zone.
According to an embodiment, described throttle is welded on the inner circumferential side of the other end of described airduct.
According to an embodiment, described outer cloth wind installation portion has in the mounted state with boiler after wall returning charge
The corresponding region of mouth, this outer cloth wind installation portion is formed with inverted triangle region with the corresponding region of wall returning charge mouth after described boiler.
This utility model additionally provides a kind of CFBB, including above-mentioned air-distribution device.
Air-distribution device of the present utility model passes through to be respectively equipped with each described cloth wind passage of described middle wind region
For configuring the throttling arrangement of cloth wind air quantity, have adjusted air quantity in burner hearth, so that two ends air quantity is increased, middle air quantity reduces, from
And fluid bed boiler furnace central temperature can be effectively reduced, improve bed temperature deviation.
The further feature of present embodiment and advantage will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide and present embodiment is further understood, and constitutes a part for description, and following
Specific embodiment be used for explaining present embodiment together, but do not constitute the restriction to present embodiment.In the accompanying drawings:
Fig. 1 is the schematic diagram of the air-distribution device according to this utility model specific embodiment.
Fig. 2 is that the broken section of the middle wind region of the air-distribution device according to this utility model specific embodiment is illustrated
Figure.
Fig. 3 is that the broken section of the peripheral wind region of the air-distribution device according to this utility model specific embodiment is illustrated
Figure.
Description of reference numerals
1:Air distribution plate 2:Cloth wind passage
3:Air-distribution device 4:Middle weight choke zone
5:Light choke zone 6:Peripheral wind region
7:Inverted triangle region 8:Throttle
9:Blast cap 10:Airduct
11:Wind distributing hole
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of present embodiment is described in detail.It should be appreciated that herein
Described specific embodiment is merely to illustrate and explains present embodiment, is not limited to present embodiment.
This utility model is low for recirculating fluidized bed big breadth depth ratio list burner hearth bed temperature two ends temperature, the high spy of medium temperature
Point is it is proposed that a kind of cloth wind of scalable fluid bed bed air volume adjustment is arranged.
Fig. 1 describes the air-distribution device according to this utility model specific embodiment, as shown in figure 1, described air-distribution device
On have peripheral wind region 6 and by this peripheral wind region 6 around middle wind region, described periphery wind region 6 on and described in
Between be each provided with least one cloth wind passage 2 on wind region, set respectively in each described cloth wind passage of described middle wind region
There is the throttling arrangement for configuring cloth wind air quantity.
By setting different choke zone, the average air quantity reducing weight choke zone blast cap is it is suppressed that center high temperature, same
When effectively increase both sides bed temperature, solve and bed particle diameter distribution uneven phenomenon occur in bed, and thus lead to bed fluidize
Inequality, big slag stockpiles excessively, bed voidage increase, fluidisation bad the problems such as.
As shown in figure 1, described middle wind region can be divided into middle weight choke zone 4 and be located at 4 liang of this middle weight choke zone
The light choke zone 5 of side, described middle weight choke zone 4 and light choke zone 5 are each disposed with described cloth wind passage 2, and described centre
The respective described throttling arrangement in weight choke zone 4 and light choke zone 5 is configured so that the cloth wind passage of described middle weight choke zone 4
Cloth wind air quantity is less than the cloth wind air quantity of the cloth wind passage of described light choke zone 5.
Described air-distribution device includes air distribution plate 1, and this air distribution plate 1 has with wind region 6 peripheral each described, each is described light
Corresponding outer cloth wind installation portion, light throttling cloth wind installation portion and centre throttle again respectively for choke zone 5 and middle weight choke zone 4
Part installation portion.
Described centre throttles cloth wind installation position in the middle part of described air distribution plate again, and its area accounts for the described air distribution plate gross area
25%~35%;The gross area of described light throttling cloth wind installation portion accounts for the 30%~40% of the described air distribution plate gross area;Described outer
The gross area of cloth wind installation portion accounts for the 25%~35% of the described air distribution plate gross area.
As shown in figure 1, having corresponding with the returning charge mouth of wall after boiler in the mounted state on described outer cloth wind installation portion
Region, this outer cloth wind installation portion is formed with inverted triangle region 7 with the corresponding region of wall returning charge mouth after described boiler.Using this
Plant the design that front wall throttling is slightly light, rear wall throttling is slightly heavy, the scalable front-back wall temperature difference.
Fig. 2 is that the broken section of the middle wind region of the air-distribution device according to this utility model specific embodiment is illustrated
Figure.As shown in Fig. 2 gently throttling cloth wind installation portion and the middle part mounting portion that throttles are not provided through this air distribution plate 1 again
The airduct 10 of thickness, one end end of each described airduct 10 is separately installed with blast cap 9, described blast cap 9 have with each corresponding
Described airduct 10 connection wind distributing hole 11, the pore of described airduct 10, the middle cavity of described blast cap 9 and described wind distributing hole 11 shape
Become described cloth wind passage.
It is provided with the throttling as described throttling arrangement in the airduct 10 of described middle weight choke zone and described light choke zone
In circle 8, and the airduct 10 of described middle weight choke zone 4, the internal diameter of the throttle 8 of setting is less than the airduct of described light choke zone 5
The internal diameter of the throttle 8 of setting in 10.The throttle internal diameter of described middle weight choke zone be described airduct internal diameter 70%~
80%;The throttle internal diameter of described light choke zone is the 80%~90% of described airduct internal diameter.
The internal diameter of shown airduct is 53~55 millimeters, and the internal diameter of the throttle of described middle weight choke zone is 39~41 millis
Rice, 44~47 millimeters of the internal diameter of throttle in described light choke zone.Preferably, the internal diameter of described shown airduct is 54 millis
Rice, the internal diameter of the throttle of described middle weight choke zone is 40 millimeters, 45 millis of the internal diameter of throttle in described light choke zone
Rice.
The inner circumferential side of the solderable other end in described airduct of described throttle.
Fig. 3 is that the broken section of the peripheral wind region of the air-distribution device according to this utility model specific embodiment is illustrated
Figure.As shown in figure 3, outer cloth wind installation portion is provided through the airduct 10 of the thickness of this air distribution plate 1, each described airduct 10
One end end is separately installed with blast cap 9, and described blast cap 9 has the wind distributing hole 11 connecting with each self-corresponding described airduct 10, institute
State the pore of airduct 10, the middle cavity of described blast cap 9 and described wind distributing hole 11 and form described cloth wind passage.
This utility model additionally provides a kind of CFBB, and it includes above-mentioned air-distribution device.
This invention is applied to China's in-service 300MW CFBB, its blast cap core pipe caliber is 54 millimeters of Φ.Its
In, middle weight choke zone and light choke zone are respectively adopted the throttles that bore is 40 millimeters and 45 millimeters of Φ of Φ.Research shows, adopts
With this utility model so that the average air quantity of peripheral wind region blast cap rises about 4.07%, effectively improve both sides bed temperature;In
Between the average air quantity of weight choke zone blast cap decline about 6.62%, thus effectively suppression center high temperature;Gently choke zone blast cap is flat
All air quantity declines about 0.75%, and by adding different degrees of throttle to zones of different, burner hearth endogenous wind has measured regulation, and two
End air quantity increases, and middle air quantity reduces, thus fluid bed boiler furnace central temperature can be effectively reduced, improves bed temperature deviation
Purpose be achieved.
Describe the preferred implementation of present embodiment above in association with accompanying drawing in detail, but, present embodiment does not limit
Detail in above-mentioned embodiment, in the range of the technology design of present embodiment, can be to the skill of present embodiment
Art scheme carries out multiple simple variant, and these simple variant belong to the protection domain of present embodiment.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, present embodiment is to each
Plant possible compound mode no longer separately to illustrate.
Additionally, combination in any can also be carried out between the various different embodiment of present embodiment, as long as it is not disobeyed
The thought of back of the body present embodiment, it equally should be considered as present embodiment disclosure of that.
Claims (10)
1. a kind of air-distribution device of fluidized-bed combustion boiler, described air-distribution device has peripheral wind region (6) and by this outer cloth wind
Area (6) around middle wind region, described periphery wind region (6) is upper and described middle wind region on be each provided with least one cloth
Wind passage (2) is it is characterised in that be respectively provided with configuration cloth wind wind in each described cloth wind passage of described middle wind region
The throttling arrangement of amount.
2. air-distribution device according to claim 1 is it is characterised in that described middle wind region is divided into middle weight choke zone
(4) the light choke zone (5) with positioned at this centre weight choke zone (4) both sides, described middle weight choke zone (4) and light choke zone (5)
Each it is disposed with described cloth wind passage (2), and the respective described throttling dress of described middle weight choke zone (4) and light choke zone (5)
Put and be configured so that the cloth wind air quantity of the cloth wind passage of weight choke zone (4) in the middle of described is less than the cloth wind of described light choke zone (5)
The cloth wind air quantity of passage.
3. air-distribution device according to claim 2 is it is characterised in that described air-distribution device includes air distribution plate (1), this cloth wind
It is right respectively with described periphery wind region (6), each described light choke zone (5) and described middle weight choke zone (4) that plate (1) has
The outer cloth wind installation portion answered, light throttling cloth wind installation portion and centre throttle part installation portion again, described outer cloth wind installation portion,
Light throttling cloth wind installation portion and centre throttle again part mounting portion be not provided through this air distribution plate (1) thickness airduct
(10), one end end of each described airduct (10) is separately installed with blast cap (9), and described blast cap (9) has self-corresponding with each
The wind distributing hole (11) that described airduct (10) connects, the pore of described airduct (10), the middle cavity of described blast cap (9) and described cloth wind
Hole (11) forms described cloth wind passage.
4. air-distribution device according to claim 3 is it is characterised in that described centre weighs choke zone (4) and described light throttling
It is provided with the throttle (8) as described throttling arrangement in the airduct (10) in area (5), and described centre weighs choke zone (4)
In airduct (10), the internal diameter of the throttle (8) of setting is less than the throttle (8) of setting in the airduct (10) of described light choke zone (5)
Internal diameter;Described centre throttles cloth wind installation position in the middle part of described air distribution plate again, and its area accounts for the described air distribution plate gross area
25%~35%;The gross area of described light throttling cloth wind installation portion accounts for the 30%~40% of the described air distribution plate gross area;Described outer
The gross area of cloth wind installation portion accounts for the 25%~35% of the described air distribution plate gross area.
5. air-distribution device according to claim 4 is it is characterised in that the throttle (8) of described middle weight choke zone (4) is interior
Footpath is the 70%~80% of described airduct (10) internal diameter;Throttle (8) internal diameter of described light choke zone (5) is described airduct (10)
The 80%~90% of internal diameter.
6. air-distribution device according to claim 5 it is characterised in that shown airduct (10) internal diameter be 53~55 millimeters,
In the middle of described, the internal diameter of the throttle of weight choke zone (4) is 39~41 millimeters, the internal diameter of the throttle in described light choke zone (5)
44~47 millimeters.
7. air-distribution device according to claim 5 is it is characterised in that the internal diameter of shown airduct (10) is 54 millimeters, described
The internal diameter of the throttle of middle weight choke zone (4) is 40 millimeters, 45 millis of the internal diameter of throttle in described light choke zone (5)
Rice.
8. air-distribution device according to claim 4 is it is characterised in that described throttle (8) is welded on described airduct (10)
The other end inner circumferential side.
9. the air-distribution device according to any one of claim 3~8 is it is characterised in that described outer cloth wind installation portion
On there is region corresponding with the returning charge mouth of wall after boiler in the mounted state, wall after this outer cloth wind installation portion and described boiler
The corresponding region of returning charge mouth is formed with inverted triangle region (7).
10. a kind of CFBB is it is characterised in that include the air-distribution device described in any one of claim 1 to 9.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021250305A1 (en) * | 2020-06-09 | 2021-12-16 | Outotec (Finland) Oy | Fludizing nozzle and fluidized bed reactor |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021250305A1 (en) * | 2020-06-09 | 2021-12-16 | Outotec (Finland) Oy | Fludizing nozzle and fluidized bed reactor |
US11806683B2 (en) | 2020-06-09 | 2023-11-07 | Metso Outotec Finland Oy | Fluidizing nozzle and fluidized bed reactor |
EP4162203A4 (en) * | 2020-06-09 | 2024-02-28 | Metso Metals Oy | Fludizing nozzle and fluidized bed reactor |
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