JPH101715A - Structure for removing dust in exhaust duct of vacuum degassing equipment and method therefor - Google Patents
Structure for removing dust in exhaust duct of vacuum degassing equipment and method thereforInfo
- Publication number
- JPH101715A JPH101715A JP14704296A JP14704296A JPH101715A JP H101715 A JPH101715 A JP H101715A JP 14704296 A JP14704296 A JP 14704296A JP 14704296 A JP14704296 A JP 14704296A JP H101715 A JPH101715 A JP H101715A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- exhaust duct
- exhaust
- ejector
- dust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、真空精錬装置の排
気ダクト内に堆積したダスト除去構造及び方法に関す
る。The present invention relates to a structure and a method for removing dust accumulated in an exhaust duct of a vacuum refining apparatus.
【０００２】[0002]
【従来の技術】従来、溶鋼中の水素、酸素、窒素等のガ
ス成分や溶鋼中の炭素を除去する方法として、減圧下で
溶鋼を処理する真空精錬法が用いられている。また、そ
の真空精錬時に、溶鋼の成分調整のための合金添加処理
が行われるのが一般的である。例えば環流式真空脱ガス
法又は循環脱ガス法と呼ばれるＲＨ真空精錬法では２本
の浸漬管を備えた真空槽を用い、この真空槽の２本の浸
漬管を取鍋内の溶鋼に浸漬する。そして、真空槽の内部
を真空排気し、浸漬管を介して真空槽内を循環する溶鋼
の脱ガスを行う。真空槽と排気装置との間に通常ガスク
ーラと復圧用ガスの遮断弁が設けられており、ガスクー
ラは排ガスを冷却し体積を減少させることにより排気装
置の吸引効率を高めるものである。また、復圧用ガス遮
断弁は、排ガス処理後真空槽を復圧する際にガスが排気
装置に行かないようにするものである。2. Description of the Related Art Conventionally, as a method for removing gas components such as hydrogen, oxygen and nitrogen in molten steel and carbon in molten steel, a vacuum refining method for treating molten steel under reduced pressure has been used. In addition, at the time of the vacuum refining, an alloy addition treatment for adjusting the composition of molten steel is generally performed. For example, in an RH vacuum refining method called a circulating vacuum degassing method or a circulating degassing method, a vacuum tank equipped with two dip tubes is used, and the two dip tubes of the vacuum tank are dipped in molten steel in a ladle. . Then, the inside of the vacuum chamber is evacuated to vacuum, and the molten steel circulating in the vacuum chamber via a dip tube is degassed. A gas cooler and a shut-off valve for gas for returning pressure are usually provided between the vacuum chamber and the exhaust device, and the gas cooler increases the suction efficiency of the exhaust device by cooling the exhaust gas and reducing the volume. Further, the pressure-recovery gas shut-off valve prevents gas from going to the exhaust device when the pressure in the vacuum chamber is recovered after exhaust gas treatment.
【０００３】以上に説明したのはＲＨ真空精錬法の場合
であるが、真空精錬法にはこの他に１本の浸漬管を備え
た真空槽を上下させながら真空精錬を行うＤＨ真空精錬
法や、取鍋全体を真空槽の中に入れて真空精錬を行う取
鍋真空精錬法が良く知られている。これらの真空精錬法
でも、排気装置は上述した例とほぼ同様の構成である。The RH vacuum refining method has been described above. In addition to the RH vacuum refining method, there is a DH vacuum refining method for performing vacuum refining while raising and lowering a vacuum tank having one dipping tube. A ladle vacuum refining method in which the entire ladle is placed in a vacuum chamber to perform vacuum refining is well known. Also in these vacuum refining methods, the exhaust device has substantially the same configuration as the above-described example.
【０００４】以上に説明したような従来の真空精錬法で
は、ダストが排気装置に流入するためにダクトの摩耗破
断やエゼクタノズルの詰まりという現象が発生してい
た。また、ダストが排気ダクトや排気装置内に堆積する
という問題があった。[0004] In the conventional vacuum refining method as described above, since dust flows into the exhaust device, phenomena such as wear and tear of the duct and clogging of the ejector nozzle have occurred. Further, there is a problem that dust accumulates in the exhaust duct and the exhaust device.
【０００５】上記問題を解決するための試みとして、特
開昭６２−２０７８２０「吸上式真空精錬設備の排気
系」に記載されるような３段ダストセパレータ方法が提
案されている。As an attempt to solve the above problem, a three-stage dust separator method has been proposed as described in Japanese Patent Application Laid-Open No. 62-207820, "Exhaust System of Suction Type Vacuum Refining Equipment".
【０００６】この方法はＲＨ真空槽に接続された煙道に
先ずガス流速を低下させてダストを分離する第１ダスト
セパレータを設け、この第１のダストセパレータの後に
ガスクーラを備えた第２ダストセパレータを設け、この
第２ダストセパレータの後に第３ダストセパレータ及び
復圧用ガス遮断弁を設け、最後に排ガス装置を設け、排
ガス中のダスト及び地金をダストセパレータで除去する
ことでガスクーラと遮断弁へのダスト付着防止と排気装
置へのダスト流入防止を図るものである。In this method, a flue connected to an RH vacuum chamber is provided with a first dust separator for separating dust by lowering a gas flow velocity, and a second dust separator provided with a gas cooler after the first dust separator. Is provided after the second dust separator, a third dust separator and a gas shut-off valve for pressure recovery are provided, and finally, an exhaust gas device is provided, and dust and metal in the exhaust gas are removed by the dust separator, so that a gas cooler and a shut-off valve are provided. To prevent dust from adhering and prevent dust from flowing into the exhaust device.
【０００７】[0007]
【発明が解決しようとする課題】上記公報に記載された
方法では、真空槽と排気装置の間にダストセパレータを
直列に３段設ける必要があり装置が大規模になる。ま
た、遮断弁以降の排気ダクト内に堆積したダストを除去
するための作業が必要である等の問題点がある。In the method described in the above publication, it is necessary to provide three stages of dust separators in series between the vacuum chamber and the exhaust device, so that the device becomes large-scale. In addition, there is a problem that an operation for removing dust accumulated in the exhaust duct after the shutoff valve is required.
【０００８】本発明は、排気装置のコンパクト化を実現
すると共に遮断弁以降の排気ダクト内に堆積したダスト
を効率的に除去することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to realize a compact exhaust device and to efficiently remove dust accumulated in an exhaust duct after a shutoff valve.
【０００９】[0009]
【課題を解決するための手段】本発明は上記課題を解決
するためのものでありその要旨は、 （１）真空槽と、多段エゼクタを備えた排気ポンプと、
前記排気ポンプを前記真空槽に連結する排気ダクトと前
記排気ポンプの所定のエゼクタと前記真空槽との間に設
けられた遮断弁と、前記遮断弁と前記所定のエゼクタと
の間に設けられた洗浄弁とを有する。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is as follows: (1) a vacuum tank, an exhaust pump having a multistage ejector,
An exhaust duct connecting the exhaust pump to the vacuum tank, a shutoff valve provided between a predetermined ejector of the exhaust pump and the vacuum tank, and a shutoff valve provided between the shutoff valve and the predetermined ejector. A washing valve.
【００１０】（２）あるいは、上記（１）の排気ダクト
内ダスト除去構造において、ダスト除去をする排気ダク
トの排気ポンプの前記所定のエゼクタ側に第２の遮断弁
を有する。(2) Alternatively, in the dust removing structure in the exhaust duct of the above (1), a second shutoff valve is provided on the predetermined ejector side of the exhaust pump of the exhaust duct for removing dust.
【００１１】（３）また、本発明の運転方法は、上記
（１）の真空脱ガス装置の排気ダクト除去構造を用い
て、前記真空槽側に設けられた前記遮断弁を閉め、前記
排気ダクトにつながる排気ポンプの前記所定のエゼクタ
を作動し洗浄弁を開にし、あるいは前記洗浄弁が弁が複
数の場合は、前記真空槽側から順次開閉する。(3) In the operation method of the present invention, the shutoff valve provided on the vacuum tank side is closed by using the exhaust duct removing structure of the vacuum degassing apparatus of (1), and the exhaust duct is provided. The predetermined ejector of the exhaust pump connected to is operated to open the cleaning valve, or when there are a plurality of cleaning valves, they are sequentially opened and closed from the vacuum tank side.
【００１２】（４）あるいは、上記（２）の真空脱ガス
装置の排気ダクト内ダスト除去構造を用いて、前記真空
槽側に設けられた前記第１遮断弁を閉め、排気ポンプの
前記所定エゼクタ側に設けられた前記第２遮断弁は開
け、前記排気ダクトにつながる前記所定エゼクタを作動
し前記洗浄弁を弁が複数の場合は、前記真空槽側から順
次開閉する。(4) Alternatively, by using the dust removal structure in the exhaust duct of the vacuum degassing apparatus of (2), the first shut-off valve provided on the vacuum tank side is closed, and the predetermined ejector of the exhaust pump is closed. The second shut-off valve provided on the side is opened, and the predetermined ejector connected to the exhaust duct is operated to open and close the cleaning valve sequentially from the vacuum tank side when there are a plurality of valves.
【００１３】[0013]
【発明の実施の形態】以下、図によって説明する。図１
は真空脱ガス装置概略図を示したものである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
1 shows a schematic view of a vacuum degassing apparatus.
【００１４】ＲＨ真空法を実施するためのＲＨ真空槽１
に、排ガス煙道２が接続されている。この煙道２に槽内
復圧弁３と、ガスクーラ４と、ダストセパレータ５が設
けられている。ダストセパレータ５の中には排気遮断弁
６が設けられている。ダストセパレータ５とスターティ
ングエゼクタ７とをつなぐ排気ダクト８に第１ＳＥ遮断
弁９と、第２ＳＥ遮断弁１０と、排気ダクト８内に堆積
したダストを除去するための洗浄弁１１が設けられてい
る。第１ＳＥ遮断弁９によりＲＨ真空槽１と排気ダクト
８とを分離している。また、第２ＳＥ遮断弁１０により
スターティングエゼクタと排気ダクト８とを分離してい
る。RH vacuum chamber 1 for performing the RH vacuum method
Is connected to an exhaust gas flue 2. The flue 2 is provided with an in-tank repressurizing valve 3, a gas cooler 4, and a dust separator 5. An exhaust shutoff valve 6 is provided in the dust separator 5. An exhaust duct 8 connecting the dust separator 5 and the starting ejector 7 is provided with a first SE shut-off valve 9, a second SE shut-off valve 10, and a cleaning valve 11 for removing dust accumulated in the exhaust duct 8. . The RH vacuum chamber 1 and the exhaust duct 8 are separated by the first SE shut-off valve 9. Further, the starting ejector and the exhaust duct 8 are separated by the second SE shut-off valve 10.
【００１５】同様に、ダストセパレータ５と６ＥＡ１
２、６ＥＢ１３、スターティングエゼクタ７とをつなぐ
主排気ダクト１４に主排気ダクト１４内に堆積したダス
トを除去するための洗浄弁１５が設けられている。ま
た、ＩＣ１６の後にＳＥ吸入弁１７と４Ｅ遮断弁１８が
設けられている。ＳＥ吸入弁１７により排気ダクト８と
主排気ダクト１４とを分離すると同時にスターティング
エゼクタ７と主排気ダクト１４とを分離している。ま
た、４Ｅ遮断弁１８により６ＥＡ１２、６ＥＢ１３と主
排気ダクト１４とを分離している。Similarly, the dust separators 5 and 6EA1
The main exhaust duct 14 connecting the 2, 6EB 13 and the starting ejector 7 is provided with a cleaning valve 15 for removing dust accumulated in the main exhaust duct 14. Further, an SE suction valve 17 and a 4E shutoff valve 18 are provided after the IC 16. The SE intake valve 17 separates the exhaust duct 8 from the main exhaust duct 14 and at the same time separates the starting ejector 7 from the main exhaust duct 14. The 4E shut-off valve 18 separates the 6EA 12 and 6EB 13 from the main exhaust duct 14.
【００１６】次に、本発明による排気ダクト８内に堆積
したダストを除去するための方法を説明する。Next, a method for removing dust accumulated in the exhaust duct 8 according to the present invention will be described.
【００１７】先ず、第１のステップとして第１ＳＥ遮断
弁９およびＳＥ吸入弁１７を閉め、スターティングエゼ
クタ７を作動させる。次に第２のステップとして第２Ｓ
Ｅ遮断弁１０を開にし排気ダクト８内を真空排気する。
そして第３のステップとして洗浄弁１１を開閉すること
で排気ダクト８内に気体を吸い込むことでダストを吹き
飛ばし除去する。洗浄弁が複数の場合は真空槽１に近い
側から順次開閉する。最後に第４のステップとして第２
ＳＥ遮断弁１０を閉にした後スターティングエゼクタ７
を止める。First, as a first step, the first SE shut-off valve 9 and the SE suction valve 17 are closed, and the starting ejector 7 is operated. Next, as a second step, the second S
The E shutoff valve 10 is opened to evacuate the exhaust duct 8.
As a third step, the cleaning valve 11 is opened and closed to suck gas into the exhaust duct 8 to blow off and remove dust. When there are a plurality of cleaning valves, they are sequentially opened and closed from the side close to the vacuum chamber 1. Finally, as the fourth step, the second
After closing the SE shut-off valve 10, the starting ejector 7
Stop.
【００１８】ここで第２ＳＥ遮断弁１０を設けない場合
でも排気ダクト８内のダストを除去することは可能であ
るが、一般にＲＨ真空精錬装置の排気装置としてスチー
ムエゼクタを使用することが多いため、第２ＳＥ遮断弁
を設けてその閉を確認後にスターティングエゼクタを止
める方が排気ダクト８内への上記の逆流を防ぎダスト付
着を低減でき、より効率的にダストを除去できる。Although the dust in the exhaust duct 8 can be removed even when the second SE shut-off valve 10 is not provided, a steam ejector is generally used as an exhaust device of the RH vacuum refining device in many cases. Providing the second SE shut-off valve and stopping the starting ejector after confirming the closing thereof can prevent the above-mentioned backflow into the exhaust duct 8 and reduce dust adhesion and can remove dust more efficiently.
【００１９】また、ダストは排気ダクト８と主排気ダク
ト１４内の底面に堆積するため、洗浄弁１１と洗浄弁１
５は排気ダクトの底面に設置する方がより効果的であ
る。Since dust accumulates on the exhaust duct 8 and the bottom of the main exhaust duct 14, the cleaning valve 11 and the cleaning valve 1
It is more effective to install 5 at the bottom of the exhaust duct.
【００２０】[0020]
【実施例】本発明の実施例を説明する。An embodiment of the present invention will be described.
【００２１】スターティングエゼクタ７につながる内径
４５０Ａの排気ダクト８の下面に８０Ａの洗浄弁１１を
５ｍ間隔で設置し、７ｃｈに１回の頻度で真空精錬処理
完了後に第１ＳＥ遮断弁９とＳＥ吸入弁１７を閉め、ス
ターティングエゼクタ７を作動させることで排気ダクト
８内を１８０ｔｏｒｒまで真空排気した状態で真空槽に
近い洗浄弁１１から順次５秒間づつ開けた。洗浄弁１１
を開けることで空気が排気ダクト内に吸引させ排気ダク
ト８内底面に堆積したダストはスターティングエゼクタ
７側に吸い込まれ排気ダクト８内から除去する。第２Ｓ
Ｅ遮断弁１０を閉にし、その閉を確認後にスターティン
グエゼクタ７を停止する。本発明を３か月間（約１８０
０ｃｈ）実施した結果、第１ＳＥ遮断弁９以降の排気ダ
クト８内のダスト除去効率を大幅に向上できた。Washing valves 11 of 80A are installed at intervals of 5 m on the lower surface of the exhaust duct 8 having an inner diameter of 450A connected to the starting ejector 7, and once the vacuum refining process is completed once every 7ch, the first SE shut-off valve 9 and the SE suction are introduced. By closing the valve 17 and activating the starting ejector 7, the inside of the exhaust duct 8 was evacuated to 180 torr and opened sequentially from the cleaning valve 11 near the vacuum tank for 5 seconds. Cleaning valve 11
By opening the opening, air is sucked into the exhaust duct and dust accumulated on the bottom surface of the exhaust duct 8 is sucked into the starting ejector 7 side and removed from the exhaust duct 8. 2nd S
The E shutoff valve 10 is closed, and after confirming the closing, the starting ejector 7 is stopped. The present invention is applied for three months (about 180
0ch) As a result, the dust removal efficiency in the exhaust duct 8 after the first SE shut-off valve 9 was significantly improved.
【００２２】[0022]
【発明の効果】本発明によって排ガス装置をコンパクト
化を実現すると共に排ガス装置の圧力損失を低減する。
更に遮断弁以降の排気ダクト内に堆積したダストの除去
効率を向上する。According to the present invention, the exhaust gas device can be made compact and the pressure loss of the exhaust gas device can be reduced.
Further, the efficiency of removing dust accumulated in the exhaust duct after the shutoff valve is improved.
【図１】真空脱ガス装置概略図。FIG. 1 is a schematic view of a vacuum degassing apparatus.
１…ＲＨ真空槽 ２…排ガス煙道 ３…槽内復圧弁 ４…ガスクーラ ５…ダストセパレータ ６…排気遮断弁 ７…スターティングエゼクタ ８…排気ダクト ９…第１ＳＥ遮断弁 １０…第２ＳＥ遮断
弁 １１…洗浄弁 １２…６ＥＡ １３…６ＥＢ １４…主排気ダクト １５…洗浄弁 １６…ＩＣ １７…ＳＥ吸入弁 １８…４Ｅ遮断弁DESCRIPTION OF SYMBOLS 1 ... RH vacuum tank 2 ... Exhaust gas flue 3 ... Tank inside pressure recovery valve 4 ... Gas cooler 5 ... Dust separator 6 ... Exhaust shutoff valve 7 ... Starting ejector 8 ... Exhaust duct 9 ... 1st SE shutoff valve 10 ... 2nd SE shutoff valve 11 ... Cleaning valve 12 ... 6EA 13 ... 6EB 14 ... Main exhaust duct 15 ... Cleaning valve 16 ... IC 17 ... SE suction valve 18 ... 4E shut-off valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 新沼 茂 君津市君津１番地 新日本製鐵株式会社君 津製鐵所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Niinuma 1 Kimitsu, Kimitsu-shi Nippon Steel Corporation Kimitsu Works
Claims (4)
ンプと、前記排気ポンプを前記真空槽に連結する排気ダ
クトと前記排気ポンプの所定のエゼクタと前記真空槽と
の間に設けられた遮断弁と、前記遮断弁と前記所定のエ
ゼクタとの間に設けられた洗浄弁とを有することを特徴
とする真空脱ガス装置の排気タクト内ダスト除去構造。1. A vacuum tank, an exhaust pump having a multistage ejector, an exhaust duct connecting the exhaust pump to the vacuum tank, and a shutoff provided between a predetermined ejector of the exhaust pump and the vacuum tank. A dust removal structure in an exhaust tact of a vacuum degassing device, comprising: a valve; and a cleaning valve provided between the shutoff valve and the predetermined ejector.
構造において、ダスト除去をする排気ダクトの排気ポン
プの前記所定のエゼクタ側に第２の遮断弁を有すること
を特徴とする真空脱ガス装置の排気ダクト内ダスト除去
構造。2. A vacuum degassing apparatus according to claim 1, further comprising a second shut-off valve provided on a side of said predetermined ejector of an exhaust pump of an exhaust duct for removing dust. Dust removal structure in the exhaust duct.
クト内ダスト除去構造を用いて、前記真空槽側に設けら
れた前記遮断弁を閉め、前記排気ダクトにつながる排気
ポンプの前記所定のエゼクタを作動し洗浄弁を開にし、
あるいは前記洗浄弁が複数の場合は、前記真空槽側から
順次開閉していくことを特徴とする真空脱ガス装置の排
気ダクト内ダスト除去方法。3. The predetermined structure of an exhaust pump connected to the exhaust duct by closing the shut-off valve provided on the vacuum tank side using the dust removing structure in the exhaust duct of the vacuum degassing apparatus according to claim 1. Activate the ejector and open the cleaning valve,
Alternatively, when there are a plurality of cleaning valves, a method for removing dust in an exhaust duct of a vacuum degassing apparatus, wherein the cleaning valves are sequentially opened and closed from the vacuum tank side.
クト内ダスト除去構造を用いて、前記真空槽側に設けら
れた前記第１遮断弁を閉め、排気ポンプの前記所定エゼ
クタ側に設けられた前記第２遮断弁は開け、前記排気ダ
クトにつながる前記所定エゼクタを作動し前記洗浄弁を
弁が複数の場合は、前記真空槽側から順次開閉し、最後
に前記第２遮断弁を閉めた後に前記所定エゼクタを停止
することを特徴とする真空脱ガス装置の排気ダクト内ダ
スト除去方法。4. The first shut-off valve provided on the vacuum tank side is closed using the dust removal structure in the exhaust duct of the vacuum degassing apparatus according to claim 2, and provided on the predetermined ejector side of the exhaust pump. The opened second shutoff valve is opened, the predetermined ejector connected to the exhaust duct is operated, and the washing valve is sequentially opened and closed from the vacuum tank side when there are a plurality of valves, and finally the second shutoff valve is closed. A method for removing dust in an exhaust duct of a vacuum degassing apparatus, wherein the predetermined ejector is stopped after the discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14704296A JP3415994B2 (en) | 1996-06-10 | 1996-06-10 | Structure and method for removing dust in exhaust duct of vacuum degassing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14704296A JP3415994B2 (en) | 1996-06-10 | 1996-06-10 | Structure and method for removing dust in exhaust duct of vacuum degassing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH101715A true JPH101715A (en) | 1998-01-06 |
| JP3415994B2 JP3415994B2 (en) | 2003-06-09 |
Family
ID=15421206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14704296A Expired - Fee Related JP3415994B2 (en) | 1996-06-10 | 1996-06-10 | Structure and method for removing dust in exhaust duct of vacuum degassing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3415994B2 (en) |
-
1996
- 1996-06-10 JP JP14704296A patent/JP3415994B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3415994B2 (en) | 2003-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5155315B2 (en) | Cleaning device and method for cleaning a workpiece | |
| RU2099156C1 (en) | Method of and system for washing of tank and extraction and processing of liquid remnants | |
| US4629407A (en) | Apparatus for the manufacture of metal powder by atomization from a nozzle with noble gas or nitrogen | |
| KR20180039647A (en) | Apparatus and method for vacuum degassing of molten steel | |
| JPH101715A (en) | Structure for removing dust in exhaust duct of vacuum degassing equipment and method therefor | |
| WO1998029575A1 (en) | Method for vacuum/reduced-pressure refining and facility for vacuum/reduced-pressure refining | |
| CA2192865A1 (en) | Exhaust gas processing system | |
| JP4796688B2 (en) | Rare gas recovery method and rare gas recovery device | |
| JPH08283827A (en) | Vacuum, evacuating device for refining furnace with low degree of vacuum | |
| JP5071962B2 (en) | Negative pressure forming apparatus and drain discharging method thereof | |
| JP3376185B2 (en) | Vacuum refining apparatus and operation method thereof | |
| JP4261807B2 (en) | Cleaning method in decompression equipment and decompression equipment | |
| JP2000257750A (en) | Exhaust gas vacuum valve for vacuum degassing equipment | |
| JP3376196B2 (en) | Vacuum refining apparatus and operation method thereof | |
| JPH07216440A (en) | Method for preventing sticking to exhaust dust of vacuum degassing treatment device and device therefor | |
| CN218392794U (en) | Device for filtering dust in vacuum pipeline during smelting of titanium sponge in vacuum state | |
| JP3231577B2 (en) | Vacuum processing equipment for molten metal and its operation method | |
| JP3015840B2 (en) | Pressure swing adsorption method for separating and recovering carbon monoxide from a mixed gas containing carbon monoxide | |
| JPH03247719A (en) | Vacuum degassing device | |
| EP1297191A1 (en) | Vacuum installation for a steel treatment vessel and its operation | |
| JPH08311533A (en) | Method for removing dust in exhaust line of vacuum degasifier and device therefor | |
| JPS62174318A (en) | Vacuum degassing and refining device | |
| RU2001124C1 (en) | Method of cut-of-furnace vacuum treatment of molten metal and device to implement it | |
| JPH01151918A (en) | Fine particle collecting apparatus for vacuum gas exhaust system | |
| JP2001335828A (en) | Method for collecting dust in vacuum reduced-pressure treating apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20030304 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080404 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090404 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090404 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100404 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110404 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120404 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130404 Year of fee payment: 10 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130404 Year of fee payment: 10 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130404 Year of fee payment: 10 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130404 Year of fee payment: 10 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140404 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |