JP2004150744A - Method and device for preventing retention at fluidized bed input pipe outlet part - Google Patents
Method and device for preventing retention at fluidized bed input pipe outlet part Download PDFInfo
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、底部から吹き込まれる流動ガスによって、燃料となる石炭の粉体等を流動させながら反応させる流動層反応炉において、流動層内に粉体等を投入する投入管の出口部の滞留を防止する方法及び装置に関する。
【０００２】
【従来の技術】
図２は従来の流動層反応炉の概要を示す説明図である。
【０００３】
図中１は、流動層反応炉で、その下部に設けられた風室２内には、酸素を含有した空気等の流動ガス３が流動ガス管４を介して供給されている。
５は風室２を区画する床で、その床５には多数のノズル６が設けられ、風室２内に供給された流動ガス３は、ノズル６によって流動層反応炉１の流動層７に噴出されるようになっている。８は燃料となる石炭の粉体９等を流動層反応炉１の流動層７内に投入する投入管で、その途中には開閉弁１０が設けられている。
【０００４】
投入管８を介して流動層反応炉１の流動層７内に粉体９等が投入されると、投入された粉体９等は、ノズル６から噴射される流動ガス３によって流動層７内で流動させられながら反応し、反応によって生成した反応ガス１１は流動層反応炉１の上端より抽出され、後段のガスタービン等に供給されるようになっている。但し、流動層内への粉体等の投入装置はごく一般的な構成であるため、参考となる先行技術文献情報は特にない。
【０００５】
【発明が解決しようとする課題】
上記従来の流動層反応炉１においては、炉内の高温を維持した状態で流動層７内に粉体９等を投入する場合、特に投入管８が上流側で気密にされ、バッチ式で粉体９等が投入されることが多いため、投入管８の出口部に滞留部１２を生じやすく、炉内の温度によっては滞留部１２の温度が粉体９等の溶融点である１３００℃〜１５００℃以上に上昇し、滞留部１２に滞留した粉体９等が溶融してクリンカ発生を生じる恐れがあった。
【０００６】
そのため従来は、投入管８の内面に対する粉体９等の溶着性を考慮して、投入管８の内面を円滑にすることができ、粉体９等が溶着しにくいメタルとして、例えば１０００℃近辺でも十分に耐える耐食性のあるステンレス（ＳＵＳ３１０Ｓ）やインコネル等の高価な材料よりなる投入管８を使用するか、ステンレスやインコネル等のメタルを内貼りした投入管８を使用する対策がとられていた。
【０００７】
また、他の方法としては、投入管８の内面を面冷却する方法もあるが、その場合には、投入管８を二重管とし、その内管と外管の間に空気や不活性ガス等の冷却ガスを流して、投入管８の出口部の温度を８００℃程度以下まで下げて滞留を防止する対策がとられていた。
【０００８】
しかしながら、従来の対策においては、投入管８として使用する材料の許容温度による耐久性の問題や、投入管８の内面の面冷却に必要な冷却ガスを多量に必要とするため、流動層７内に流入する冷却ガスの増加により、反応効率が低下すると言う問題点があった。
【０００９】
本発明は上記問題点を解決することを課題とするもので、クリンカ発生が流動層内の滞留部に生じていることに着目し、投入管の出口部に生じやすい滞留を防止して、耐久性にすぐれ、冷却ガスの増加による反応効率の低下もない、実用上きわめて有効な流動層投入管出口部の滞留防止方法及び装置を提供するものである。
【００１０】
【課題を解決するための手段】
上記課題を解決するために、請求項１の発明は、底部から吹き込まれる流動ガスによって、燃料となる石炭の粉体等を流動させながら反応させる流動層反応炉において、流動層内に粉体等を投入する投入管の出口部に、滞留防止用ガスを連続的又は間欠的に噴射させるようにしたことを特徴とする流動層投入管出口部の滞留防止方法とした。
【００１１】
これにより、投入管の出口部に生じやすい滞留の発生は効果的に防止され、耐久性がよく、滞留防止用ガスの使用量も少くてすみ、長期間安定した良好な反応効率を維持することができ、運転コストも安価となる。
【００１２】
また、請求項２の発明は、上記の滞留防止用ガスとして、流動ガスを利用したことを特徴とする、請求項１に記載の流動層投入管出口部の滞留防止方法とした。
【００１３】
これにより、滞留防止用ガスとして専用のガスを使用しなくても、流動ガスを利用して、請求項１の方法よりもさらに経済的に滞留の発生を防止することができる。
【００１４】
また、請求項３の発明は、底部から吹き込まれる流動ガスによって、燃料となる石炭の粉体等を流動させながら反応させる流動層反応炉において、流動層内に粉体等を投入する投入管の出口部に、滞留防止用ガスを噴射させる噴射ガス管を接続し、その噴射ガス管の途中に開閉制御弁を設けたことを特徴とする流動層投入管出口部の滞留防止装置とした。
【００１５】
これにより、噴射ガス管の途中に設けた開閉制御弁を制御するだけで、投入管の出口部に生じやすい滞留の発生は、噴射される滞留防止用ガスによって効果的に防止され、耐久性がよく、長期間安定した良好な反応効率を維持することができ、運転コストも安価となり、構造もきわめて簡単で安価に製作することができる。
【００１６】
また、請求項４の発明は、上記噴射ガス管に、流動ガス管の分岐管を接続したことを特徴とする請求項３に記載の流動層投入管出口部の滞留防止装置とした。
【００１７】
これにより、滞留防止用ガスとして専用のガスを使用しなくても、流動ガスを利用して、請求項３の装置よりもさらに経済的に滞留の発生を防止することができる。
【００１８】
【発明の実施の形態】
本発明の流動層投入管出口部の滞留防止方法及び装置の１実施形態について、図１により説明する。
【００１９】
図１は本発明の１実施形態に係る流動層投入管出口部の滞留防止方法及び装置を適用した流動層反応炉の概要を示す説明図である。
【００２０】
図中、図２に示す従来の流動層反応炉の概要を示す説明図に対応して、同一部分には同一符号を付し、重複した説明は省略する。
【００２１】
図１に示す１実施形態においては、流動層７内に粉体９等を投入する投入管８の出口部に、滞留防止用ガス１３を噴射させる噴射ガス管１４が、その先端を投入管８の出口部に生じやすい滞留部１２に臨むように接続されており、その噴射ガス管１４の途中には、手動又は制御機器等によって開閉される開閉制御弁１５が設けられている。
【００２２】
なお、投入管８はステンレスやインコネル等の材料よりなるものを使用したり、ステンレスやインコネル等のメタルを内貼りした投入管を使用する必要はなく、また、投入管８を二重にしてその内管と外管の間に空気や不活性ガス等の冷却ガスを流して投入管８の内面を面冷却したりする必要もなく、投入管８の内面は安価な耐火材が使用されている。
【００２３】
上記のように構成された本発明の１実施形態においては、開閉制御弁１５を開にして滞留防止用ガス１３を噴射ガス管１４から連続的又は間欠的に噴射させると、滞留防止用ガス１３は滞留部１２の生じやすい投入管８の出口部に噴射され、滞留が効果的に防止されることになる。
【００２４】
この時、噴射ガス管１４から噴射される滞留防止用ガス１３を連続的に噴射させる流量や、間欠的に噴射させるタイミング等は、運転状況や滞留の生じやすさ等に応じて任意に設定することができ、場合によっては、連続噴射と間欠噴射を組み合せることも可能であり、使用する滞留防止用ガス１３の使用量は、従来、投入管８の内面の面冷却に必要な冷却用ガスの使用の約１／２〜１／１０程度の量で充分である。
【００２５】
また、開閉制御弁１５の開閉は、手動でも自動でも行うことができるが、滞留部１２にクリンカが発生すると、流動層反応炉１の操業に重大な支障をきたすので、クリンカが発生する原因となる滞留はできるだけ早期に防止するよう最適に制御することが望ましいことは言うまでもない。
【００２６】
なお、図中点線で示したライン１６は流動ガス管４の分岐管であり、分岐管１６の先端は図示のように噴射ガス管１４に接続されている。
【００２７】
このように、流動ガス管４の分岐管１６を噴射ガス管１４に接続しておけば、滞留防止用ガス１３として流動ガス３を有効に利用することができ、別途専用の滞留防止用ガス１３を使用しなくてもよいので、きわめて経済的である。
【００２８】
但し、場合によっては、流動ガス３と滞留防止用ガス１３とを混合させて、噴射ガス管１４から噴射させてもよく、必要に応じて分岐管１６の途中にも開閉制御弁１５を設けてもよい。
【００２９】
【発明の効果】
請求項１の発明に係る流動層投入管出口部の滞留防止方法は、底部から吹き込まれる流動ガスによって、燃料となる石炭の粉体等を流動させながら反応させる流動層反応炉において、流動層内に粉体等を投入する投入管の出口部に、滞留防止用ガスを連続的又は間欠的に噴射させるようにしたので、投入管の出口部に生じやすい滞留の発生は効果的に防止され、耐久性がよく、滞留防止用ガスの使用量も少くてすみ、長期間安定して良好な反応効率を維持することができ、運転コストも安価となる。
【００３０】
また、請求項２に係る流動層投入管出口部の滞留防止方法は、請求項１のものにおいて、上記の滞留防止用ガスとして、作動ガスを利用したので、滞留防止用ガスとして専用のガスを使用しなくても、流動性ガスを利用して、請求項１の方法よりもさらに経済的に滞留の発生を防止することができる。
【００３１】
また、請求項３に係る流動層投入管出口部の滞留防止装置は、底部から吹き込まれる流動ガスによって、燃料となる石炭の粉体等を流動させながら反応させる流動層反応炉において、流動層内に粉体等を投入する投入管の出口部に、滞留防止用ガスを噴射させる噴射ガス管を接続し、その噴射ガス管の途中に開閉制御弁を設けて構成したので、噴射ガス管の途中に設けた開閉制御弁を制御するだけで、投入管の出口部に生じやすい滞留の発生は、噴射される滞留防止ガスによって効果的に防止され、耐久性がよく、長期間安定した良好な反応効率を維持することができ、運転コストも安価となり、構造もきわめて簡単で安価に製作することができる。
【００３２】
また、請求項４に係る流動層投入管出口部の滞留防止装置は、請求項３に記載のものにおいて、上記噴射ガス管に、流動ガス管の分岐管を接続して構成したので、滞留防止用ガスとして専用のガスを使用しなくても、流動ガスを利用して、請求項３の装置よりもさらに経済的に滞留の発生を防止することができる。
【図面の簡単な説明】
【図１】本発明の１実施形態に係る流動層投入管出口部の滞留防止方法及び装置を適用した流動層反応炉の概要を示す説明図である。
【図２】従来の流動層反応炉の概要を示す説明図である。
【符号の説明】
１ 流動層反応炉
２ 風室
３ 流動ガス
４ 流動ガス管
５ 床
６ ノズル
７ 流動層
８ 投入管
９ 粉体
１０ 開閉弁
１１ 反応ガス
１２ 滞留部
１３ 滞留防止用ガス
１４ 噴射ガス管
１５ 開閉制御弁
１６ 分岐管[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is directed to a fluidized bed reactor in which a fluid gas blown from the bottom is used to cause coal powder or the like serving as a fuel to react while flowing the fluid. The present invention relates to a method and an apparatus for preventing the same.
[0002]
[Prior art]
FIG. 2 is an explanatory view showing an outline of a conventional fluidized bed reactor.
[0003]
In the figure, reference numeral 1 denotes a fluidized bed reactor, in which a flowing gas 3 such as air containing oxygen is supplied via a flowing gas pipe 4 into an air chamber 2 provided at a lower portion thereof.
[0004]
When the powder 9 and the like are charged into the fluidized bed 7 of the fluidized bed reactor 1 through the charging pipe 8, the charged powder 9 and the like are dispersed in the fluidized bed 7 by the flowing gas 3 injected from the nozzle 6. The reaction gas 11 generated by the reaction while being fluidized is extracted from the upper end of the fluidized bed reactor 1 and supplied to a gas turbine or the like at the subsequent stage. However, since the device for feeding the powder or the like into the fluidized bed has a very general configuration, there is no particular prior art document information to be referred to.
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional fluidized bed reactor 1, when the powder 9 or the like is charged into the fluidized bed 7 while maintaining the high temperature in the furnace, the charging pipe 8 is made airtight especially on the upstream side, and the powder is batchwise processed. Since the body 9 and the like are often charged, a stagnant portion 12 is likely to be generated at the outlet of the charging tube 8, and depending on the temperature in the furnace, the temperature of the stagnant portion 12 is 1300 ° C. There is a possibility that the temperature of the powder 9 or the like which has risen to 1500 ° C. or more and stayed in the staying portion 12 may be melted to generate clinker.
[0006]
Therefore, conventionally, the inner surface of the charging tube 8 can be made smooth in consideration of the weldability of the powder 9 and the like to the inner surface of the charging tube 8, and as a metal to which the powder 9 and the like are not easily welded, for example, around 1000 ° C. However, measures have been taken to use the input pipe 8 made of an expensive material such as stainless steel (SUS310S) or Inconel which has sufficient corrosion resistance, or to use the input pipe 8 in which a metal such as stainless steel or Inconel is bonded. .
[0007]
As another method, there is a method of surface cooling the inner surface of the charging pipe 8, but in this case, the charging pipe 8 is formed as a double pipe, and air or inert gas is provided between the inner pipe and the outer pipe. For example, a countermeasure has been taken to prevent the stagnation by flowing a cooling gas such as the above to lower the temperature of the outlet portion of the charging pipe 8 to about 800 ° C. or less.
[0008]
However, in the conventional measures, there is a problem of durability due to the allowable temperature of the material used as the charging pipe 8 and a large amount of cooling gas required for cooling the inner surface of the charging pipe 8 is required. However, there is a problem that the reaction efficiency is reduced due to an increase in the amount of cooling gas flowing into the reactor.
[0009]
The present invention has been made to solve the above problems, and focuses on clinker generation occurring in a stagnant portion in a fluidized bed. An object of the present invention is to provide a method and apparatus for preventing stagnation at the outlet of a fluidized bed charging pipe which is excellent in practicality and practically extremely effective without reducing the reaction efficiency due to an increase in cooling gas.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, the invention of claim 1 is directed to a fluidized bed reactor in which a coal gas or the like serving as a fuel is caused to react while flowing by a flowing gas blown from a bottom portion. The method for preventing stagnation at the outlet of a fluidized bed input pipe is characterized in that a stagnation preventing gas is continuously or intermittently injected into an outlet of a charging pipe into which slag is injected.
[0011]
This effectively prevents the occurrence of stagnation that is likely to occur at the outlet of the charging pipe, improves durability, requires less use of stagnation prevention gas, and maintains stable and good reaction efficiency for a long time. And the operating cost is reduced.
[0012]
The invention according to claim 2 is the method for preventing stagnation at the outlet of a fluidized-bed input pipe according to claim 1, wherein a fluent gas is used as the stagnation-preventing gas.
[0013]
Thus, even if a dedicated gas is not used as the stagnation preventing gas, the stagnation can be more economically prevented by using the flowing gas than in the method of the first aspect.
[0014]
The invention according to claim 3 is a fluidized bed reactor for reacting while flowing coal powder or the like as a fuel by a fluidized gas blown from the bottom, in a charging pipe for charging powder or the like into the fluidized bed. An injection gas pipe for injecting the gas for preventing retention is connected to the outlet, and an opening / closing control valve is provided in the middle of the injection gas pipe.
[0015]
Thus, by simply controlling the on-off control valve provided in the middle of the injection gas pipe, the generation of stagnation that is likely to occur at the outlet of the injection pipe is effectively prevented by the injected stagnation prevention gas, and the durability is improved. Good and stable reaction efficiency can be maintained for a long period of time, the operating cost can be reduced, and the structure can be made extremely simple and inexpensive.
[0016]
According to a fourth aspect of the present invention, there is provided the apparatus for preventing stagnation at the outlet of a fluidized bed charging pipe according to the third aspect, wherein a branch pipe of a fluidized gas pipe is connected to the injection gas pipe.
[0017]
Thus, even if a dedicated gas is not used as the stagnation preventing gas, the stagnation can be more economically prevented by using the flowing gas than in the apparatus of the third aspect.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a method and an apparatus for preventing stagnation at the outlet of a fluidized bed charging pipe according to the present invention will be described with reference to FIG.
[0019]
FIG. 1 is an explanatory view showing an outline of a fluidized bed reactor to which a method and an apparatus for preventing stagnation at an outlet of a fluidized bed charging pipe according to an embodiment of the present invention are applied.
[0020]
In the figure, the same reference numerals are given to the same parts corresponding to the explanatory view showing the outline of the conventional fluidized bed reactor shown in FIG. 2, and duplicate description is omitted.
[0021]
In one embodiment shown in FIG. 1, an injection gas pipe 14 for injecting a stagnation-preventing gas 13 is provided at an outlet of a charging pipe 8 for charging the powder 9 or the like into the fluidized bed 7. An opening / closing control valve 15 that is opened / closed manually or by a control device or the like is provided in the middle of the injection gas pipe 14.
[0022]
It is not necessary to use a material made of a material such as stainless steel or Inconel, or to use a material having a metal such as stainless steel or Inconel. There is no need to flow a cooling gas such as air or an inert gas between the inner pipe and the outer pipe to cool the inner surface of the input pipe 8, and an inexpensive refractory material is used for the inner surface of the input pipe 8. .
[0023]
In the embodiment of the present invention configured as described above, when the opening / closing control valve 15 is opened and the stagnation preventing gas 13 is continuously or intermittently injected from the injection gas pipe 14, the stagnation preventing gas 13 Is injected into the outlet portion of the charging pipe 8 where the stagnation portion 12 is likely to be generated, and the stagnation is effectively prevented.
[0024]
At this time, the flow rate at which the retention preventing gas 13 injected from the injection gas pipe 14 is continuously injected, the timing at which the gas is intermittently injected, and the like are arbitrarily set in accordance with the operating conditions and the likelihood of the occurrence of stagnation. In some cases, continuous injection and intermittent injection can be combined, and the amount of the stagnation preventing gas 13 used is conventionally limited to the cooling gas required for cooling the inner surface of the charging pipe 8. About 1/2 to 1/10 of the amount used is sufficient.
[0025]
The opening and closing of the opening and closing control valve 15 can be performed either manually or automatically. However, if clinker is generated in the stagnant portion 12, the operation of the fluidized bed reactor 1 is seriously hindered. It is needless to say that it is desirable to optimally control such stagnation as early as possible.
[0026]
Note that a line 16 indicated by a dotted line in the figure is a branch pipe of the flowing gas pipe 4, and a tip of the branch pipe 16 is connected to the injection gas pipe 14 as shown.
[0027]
In this way, if the branch pipe 16 of the flowing gas pipe 4 is connected to the injection gas pipe 14, the flowing gas 3 can be effectively used as the stagnation preventing gas 13, and the dedicated stagnation preventing gas 13 can be used separately. It is very economical because it is not necessary to use.
[0028]
However, depending on the case, the flowing gas 3 and the stagnation preventing gas 13 may be mixed and injected from the injection gas pipe 14, and an opening / closing control valve 15 may be provided in the middle of the branch pipe 16 as necessary. Is also good.
[0029]
【The invention's effect】
The method for preventing stagnation at the outlet of a fluidized-bed input pipe according to the invention of claim 1 is characterized in that in a fluidized-bed reactor, a coal gas or the like serving as a fuel is reacted while flowing by a flowing gas blown from the bottom. Since the stagnation preventing gas is continuously or intermittently sprayed to the outlet of the charging pipe for charging powder or the like, the occurrence of stagnation which is likely to occur at the outlet of the charging pipe is effectively prevented, The durability is good, the use amount of the gas for preventing stagnation is small, the good reaction efficiency can be stably maintained for a long time, and the operation cost is low.
[0030]
In the method for preventing stagnation at the outlet of a fluidized-bed input pipe according to claim 2, since the working gas is used as the stagnation gas in the method of claim 1, a dedicated gas is used as the stagnation prevention gas. Even if it is not used, the generation of stagnation can be prevented more economically than the method of claim 1 by utilizing the fluid gas.
[0031]
The apparatus for preventing stagnation at the outlet of a fluidized-bed input pipe according to claim 3 is a fluidized-bed reactor in which coal gas or the like serving as fuel is caused to react by flowing gas blown from the bottom portion. An injection gas pipe for injecting a gas for preventing stagnation is connected to an outlet of a charging pipe for charging powder or the like into the pipe, and an opening / closing control valve is provided in the middle of the injection gas pipe. By simply controlling the on-off control valve provided at the outlet, the occurrence of stagnation which is likely to occur at the outlet of the charging pipe is effectively prevented by the injected stagnation prevention gas, has good durability, and is stable over a long period of time. Efficiency can be maintained, operating costs can be reduced, and the structure can be made extremely simple and inexpensive.
[0032]
According to a fourth aspect of the present invention, there is provided a device for preventing stagnation at an outlet portion of a fluidized-bed input pipe, wherein the blast gas pipe is connected to a branch pipe of a fluidized gas pipe. Even if a dedicated gas is not used as a service gas, the occurrence of stagnation can be prevented more economically than the device according to the third aspect by using a flowing gas.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a fluidized bed reactor to which a method and an apparatus for preventing stagnation of an outlet portion of a fluidized bed charging pipe according to an embodiment of the present invention are applied.
FIG. 2 is an explanatory view showing an outline of a conventional fluidized bed reactor.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 fluidized bed reactor 2 air chamber 3 flowing gas 4 flowing
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002317986A JP2004150744A (en) | 2002-10-31 | 2002-10-31 | Method and device for preventing retention at fluidized bed input pipe outlet part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002317986A JP2004150744A (en) | 2002-10-31 | 2002-10-31 | Method and device for preventing retention at fluidized bed input pipe outlet part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2004150744A true JP2004150744A (en) | 2004-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002317986A Pending JP2004150744A (en) | 2002-10-31 | 2002-10-31 | Method and device for preventing retention at fluidized bed input pipe outlet part |
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| Country | Link |
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| JP (1) | JP2004150744A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1974060A1 (en) * | 2005-12-26 | 2008-10-01 | Posco | Apparatus for manufacturing molten irons |
| CN102563631A (en) * | 2012-02-16 | 2012-07-11 | 广东电网公司电力科学研究院 | Blanking port integrated blanking device for biomass fuel circulating fluidized bed boiler |
| CN106356289A (en) * | 2015-07-17 | 2017-01-25 | 株式会社日立国际电气 | A gas supply nozzle, a substrate processing apparatus, and a method of manufacturing the semiconductor device |
| JP2020139715A (en) * | 2019-03-01 | 2020-09-03 | 日本製鉄株式会社 | Fluidized dryer |
-
2002
- 2002-10-31 JP JP2002317986A patent/JP2004150744A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1974060A1 (en) * | 2005-12-26 | 2008-10-01 | Posco | Apparatus for manufacturing molten irons |
| EP1974060A4 (en) * | 2005-12-26 | 2010-05-26 | Posco | Apparatus for manufacturing molten irons |
| US8119059B2 (en) | 2005-12-26 | 2012-02-21 | Posco | Apparatus for manufacturing molten irons |
| CN102563631A (en) * | 2012-02-16 | 2012-07-11 | 广东电网公司电力科学研究院 | Blanking port integrated blanking device for biomass fuel circulating fluidized bed boiler |
| CN106356289A (en) * | 2015-07-17 | 2017-01-25 | 株式会社日立国际电气 | A gas supply nozzle, a substrate processing apparatus, and a method of manufacturing the semiconductor device |
| JP2020139715A (en) * | 2019-03-01 | 2020-09-03 | 日本製鉄株式会社 | Fluidized dryer |
| JP7260751B2 (en) | 2019-03-01 | 2023-04-19 | 日本製鉄株式会社 | Fluidized dryer |
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