JPS596890B2 - hot air stove equipment - Google Patents
hot air stove equipmentInfo
- Publication number
- JPS596890B2 JPS596890B2 JP7450476A JP7450476A JPS596890B2 JP S596890 B2 JPS596890 B2 JP S596890B2 JP 7450476 A JP7450476 A JP 7450476A JP 7450476 A JP7450476 A JP 7450476A JP S596890 B2 JPS596890 B2 JP S596890B2
- Authority
- JP
- Japan
- Prior art keywords
- hot
- blast furnace
- hot air
- blast
- air
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 description 9
- 238000007664 blowing Methods 0.000 description 8
- 238000005338 heat storage Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011017 operating method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Description
【発明の詳細な説明】
本発明は、高炉の附帯設備である熱風炉装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot blast furnace device which is ancillary equipment of a blast furnace.
従来、高炉用熱風炉としては、蓄熱交換炉が採用され、
一般に高炉１基に対して３〜４基の熱風炉が設置されて
いる。Conventionally, heat storage exchange furnaces have been used as hot blast furnaces for blast furnaces.
Generally, three to four hot blast furnaces are installed for one blast furnace.
そして、この熱風炉による高炉への送風は、例えば、１
基の高炉に対して熱風炉が３基設置されている。The air blown to the blast furnace by this hot blast furnace is, for example, 1
Three hot blast furnaces are installed for each blast furnace.
そして、この熱風炉による高炉への送風は、例えば、１
基の高炉に対して熱風炉が３基設置されている場合には
、添附図面の第１図に示すように、熱風炉をＡ１〜Ａ３
とする時、ある時隔においては、１１６． １の１基が
送風（図においては、実線によって示してある）、１６
． ２及び３０２基が加熱（図においては、点線によっ
て示してある）というように、一定時間間隔ごとに順次
熱風炉を、例えば、煮１→Ａ２→煮３と替えて、高炉へ
熱風が送られるようにしている。The air blown to the blast furnace by this hot blast furnace is, for example, 1
If three hot blast furnaces are installed for one blast furnace, as shown in Figure 1 of the attached drawings, the hot blast furnaces are installed in A1 to A3.
When, at a certain time interval, 116. One unit of 1 is a fan (indicated by a solid line in the figure), 16
．． 2 and 302 are heated (indicated by dotted lines in the figure), hot air is sent to the blast furnace by changing the hot blast furnaces sequentially at fixed time intervals, for example, Boiling 1 → A2 → Boiling 3. That's what I do.
この方法によると、送風初期においては、蓄熱室は十分
に加熱されているので、蓄熱室を通って高炉に送られる
空気は、比較的高温の熱風が得られるが、送風末期にな
るに従って蓄熱室は、蓄熱室を通る空気により冷却され
て行くので、それだけ高炉に送られる熱風の温度は低下
する（同図の曲線Ｔ参照）。According to this method, at the beginning of the blast, the heat storage chamber is sufficiently heated, so the air sent to the blast furnace through the heat storage chamber becomes relatively high-temperature hot air. is cooled by the air passing through the heat storage chamber, so the temperature of the hot air sent to the blast furnace decreases accordingly (see curve T in the figure).
従って、上記方法においては、高温の熱風を安定して高
炉へ送ることは困難であり、それだけ、高炉操業は不安
定となるので、高炉は十分な生産を上げることはできな
い。Therefore, in the above method, it is difficult to stably send high-temperature hot air to the blast furnace, and the blast furnace operation becomes unstable accordingly, so that the blast furnace cannot achieve sufficient production.
また、近年における高炉操業法の進歩は著しく、高炉の
大形化、高圧操業が一般化されている。In addition, blast furnace operating methods have made remarkable progress in recent years, with larger blast furnaces and higher pressure operations becoming commonplace.
このために、このような高炉操業における高炉への送風
は、送風量及び送風圧力の増加、１２００゜Ｃ以上の送
風温度が要求されている。For this reason, when blowing air into the blast furnace in such a blast furnace operation, an increase in the amount and pressure of air blowing, and a blowing temperature of 1200° C. or higher are required.
従って、この要求を満たすだめに、高炉への送風は、例
えば、４基の熱風炉を設置し、スタツガードパラレル制
御により、送風量及び送風圧力の増加を図り、高温熱風
を高炉へ送風している。Therefore, in order to meet this requirement, high-temperature hot air is blown to the blast furnace by installing, for example, four hot blast furnaces and using staggered parallel control to increase the amount and pressure of the blast. ing.
すなわち、第２図に示すように、常時、２基の熱風炉（
例えば、ある時隔において、扁１及びＡ２）の送風炉は
加熱され、次ぎの時隔においては、Ａ１及びＡ３の熱風
炉により送風され、Ａ２及びＡ４の熱風炉は加熱されて
いるように操炉されている。In other words, as shown in Figure 2, two hot air stoves (
For example, in one interval, the blast furnaces of planes 1 and A2) are heated, and in the next interval, air is blown by the hot blast stoves of A1 and A3, and the hot blast stoves of A2 and A4 are operated as if they were heated. It has been heated.
また、このような熱風炉の操炉において、設置されてい
る熱風炉の内、１基が設備的な事故、あるいは、巻き替
え等の事情により、短期又は長期間休止することがある
が、この場合には、熱風炉の能力は低下するので、送風
量及び、送風温度の低下を余儀なくされる。In addition, in the operation of such hot-blast stoves, one of the installed hot-blast stoves may be out of service for a short or long period due to an equipment accident or due to circumstances such as rewinding. In this case, the capacity of the hot air stove decreases, forcing a reduction in the amount of air blown and the temperature at which the air is blown.
例えば、熱風炉３基設置の内、１基が休止すると、１基
送風、１基加熱の操業となるので、熱風炉の能力は著し
く低下し、高炉への送風量及び送風温度は著しく低下す
るので、高炉の出銑量は大巾に減じることになる。For example, if one of three hot-blast furnaces is out of service, one will be operating to blow air and one to heat, so the capacity of the hot-blast stove will drop significantly, and the amount of air blown to the blast furnace and the temperature of the air blown will drop significantly. Therefore, the amount of pig iron produced by the blast furnace will be significantly reduced.
また、熱風炉４基設置の内１基が休止すると、第１図の
場合と同様に、１基送風、２基加熱の操炉方法を行なう
が、高炉の高能率化操業を行なうには、送風量及び熱風
温度が共に不十分なものとなり、また、高炉操業を不安
定とするので、減産を余儀なくされるようになる。In addition, if one of the four hot blast furnaces installed is out of service, the furnace operation method is to blow air from one and heat from two, similar to the case in Figure 1, but in order to operate the blast furnace with high efficiency, Both the amount of air blown and the temperature of the hot air become insufficient, and the blast furnace operation becomes unstable, forcing a reduction in production.
しかしながら、熱風炉が３基操業の時、これが２基にな
るのと、４基操業が３基操業になるのとを比較すると、
後者（４基→３基）の場合の送風温度の低下による被害
は非常に少ない。However, if you compare when three hot blast stoves are operated, it becomes two, and when four hot blast furnaces are operated, it becomes three.
In the latter case (4 units → 3 units), the damage caused by the drop in air temperature is very small.
実例によると、４基操業の時に送風温度が１２７０℃で
あったものが、３基操業になった時には１１７０℃、す
なわち、１００゜Ｃの低下で送風量を維持することがで
きたのに対し、他の時期に、３基操業時に１２５０℃の
送風温度であったものが、２基操業に切替えた時には、
送風温度が７００℃、すなわち、５５０゜Ｃも低下した
。According to an actual example, when four units were operated, the air temperature was 1270°C, but when three units were operated, the temperature was 1170°C, that is, the air flow rate could be maintained with a decrease of 100°C. , At other times, when operating three units, the air temperature was 1250°C, but when switching to operating two units,
The blowing temperature decreased by 700°C, that is, by 550°C.
本発明は、以上のような従来の熱風炉における問題点を
解消した改良された熱風炉装置を得ることを、その目的
とするもので、このだめに、本発明においては、隣設さ
れた２基の高炉において、その内の１基に３基の熱風炉
を附帯させ、他の１基の高炉に４基の熱風炉を附帯させ
、４基中の１基を切替え可能として他の高炉に附帯する
熱風炉群の熱風本管と送風本管とに両面シール弁を介し
て接続するようにしたことを特徴とするものである。An object of the present invention is to obtain an improved hot-blast stove device that solves the problems of the conventional hot-blast stoves as described above. In the first blast furnace, one of the blast furnaces is attached with three hot blast furnaces, the other blast furnace is attached with four hot blast furnaces, and one of the four blast furnaces is switchable so that it can be connected to the other blast furnace. It is characterized in that it is connected to the hot air main pipe of the attached hot air stove group and the blast main pipe via a double-sided seal valve.
また、本発明においては、切替え熱風炉と各高炉の熱風
本管とを、両面シール熱風弁を配置された熱風支管によ
って連接することにより、他の高炉へ自在に切替え送風
することができると共に各高炉への熱風炉の切替えを、
休風することなしに行なうことができる。Furthermore, in the present invention, by connecting the switching hot blast furnace and the hot blast main pipe of each blast furnace through hot blast branch pipes equipped with double-sided sealed hot air valves, it is possible to freely switch and blow air to other blast furnaces. Switching hot air stove to blast furnace,
It can be done without taking a break.
以下、本発明をその実施要領を示す添附図の第３図に基
づいて詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to FIG. 3 of the accompanying drawings showing the implementation procedure thereof.
第３図において、隣設した２基の高炉Ａ，Ｂに、それぞ
れ附帯する熱風炉群ａ−１〜ａ〜３、ｂ−１〜ｂ−３を
並設する。In FIG. 3, two adjacent blast furnaces A and B are provided with associated hot blast furnace groups a-1 to a-3 and b-1 to b-3, respectively.
更に、これらの熱風炉群に隣接して切替え可能な熱風炉
ｈを設置する。Furthermore, a switchable hot air stove h is installed adjacent to these hot air stove groups.
この切替え可能な熱風炉ｈは、両面シール熱風弁１ない
し２を配置された熱風支管３及び４によって、各熱風本
管５及び６に連接されている。This switchable hot air stove h is connected to each hot air main 5 and 6 by a hot air branch 3 and 4 in which a double-sided sealed hot air valve 1 or 2 is arranged.
また、切替冷風弁１３及び１５は、それぞれの高炉の送
風本管１４ａ、１４ｂに接続されるが、これも両面シー
ル弁となっている。Further, the switching cold air valves 13 and 15 are connected to the blast main pipes 14a and 14b of the respective blast furnaces, and these are also double-sided sealed valves.
本発明は以上のような構成を有するが、本発明は切替え
可能な熱風炉ｈを設けたことに特徴があるもので、次ぎ
に第３図について、本発明による熱風炉装置の操業を説
明する。The present invention has the above configuration, but the present invention is characterized by providing a switchable hot air stove h.Next, referring to FIG. 3, the operation of the hot air stove device according to the present invention will be explained. .
１．通常の操業
通常の操業は、第３図においては、切替え可能な熱風炉
ｈから分岐した熱風本管６に通じる熱風支管４に配置さ
れた熱風弁２を閉じ、他方の熱風支管３に配置された熱
風弁１を開き、また、冷風弁もＢ高炉用の１３を閉じ、
Ａ高炉用の１５を開くことにより、高炉Ａ用の熱風炉ａ
−１〜ａ−３に組み込まれる。1. Normal operation In normal operation, in FIG. 3, the hot air valve 2 disposed in the hot air branch pipe 4 leading to the hot air main pipe 6 branched from the switchable hot air stove h is closed, and the hot air valve 2 disposed in the other hot air branch pipe 3 is closed. Open the hot air valve 1, and also close the cold air valve 13 for B blast furnace.
By opening 15 for blast furnace A, hot blast furnace a for blast furnace A can be opened.
-1 to a-3.
従って、高炉Ａの操業は、２基送風、２基加熱の操炉法
により送風されるので、従来設備の操炉法に比べて、切
替え可能な熱風炉ｈを組み込んだだけ余力を持って送風
を行なうことができ、高炉操業を安足させることができ
る。Therefore, in the operation of blast furnace A, air is blown by a two-unit blowing, two-unit heating furnace operation method, so compared to the furnace operation method of conventional equipment, the air is blown with extra power by incorporating the switchable hot blast furnace h. This allows blast furnace operation to be carried out with ease.
他方、高炉Ｂの操業は、従来設備を使用して１基送風、
２基加熱の操炉法によるものである。On the other hand, blast furnace B is operated using conventional equipment, with one blower and
This is based on a two-furnace heating method.
２．休止時の操業方法
第３図において、例えば、高炉Ｂ用の熱風炉ｂ−ｉ〜ｂ
−３の内のいずれか１基が休止したも．のと仮定すると
、切替え可能な熱風炉ｈから分岐した熱風支管３及び４
にそれぞれ配置された熱風弁１及び２を、また、切替冷
風弁１３と１５とをそれぞれ、閉開することにより、高
炉Ｂ用の熱風炉に組み込むことができる。2. In FIG. 3, the operating method during suspension, for example, the hot blast furnaces b-i to b for blast furnace B
- Any one of the three units is out of service. Assuming that, the hot air branch pipes 3 and 4 branched from the switchable hot air stove h
By closing and opening the hot air valves 1 and 2 arranged respectively in the hot air valves 1 and 2 and the switching cold air valves 13 and 15, respectively, it can be incorporated into the hot air furnace for the blast furnace B.
従って、高炉操業は減産することなしに、従来どおりの
操業を続けることができる。Therefore, blast furnace operations can continue as usual without reducing production.
他方、高炉Ａぱ、熱風炉ａ−１〜ａ−３により、１基送
風、２基加熱の操炉により送風されるので、送風能力は
余力がなくなり、高炉Ａの操業は若干低下するが、その
程度は、高炉Ｂの減産を考慮すると、非常に軽微なもの
であることが分かる。On the other hand, since blast furnace A and hot blast furnaces a-1 to a-3 blow air by operating one blowing furnace and two heating furnaces, there is no surplus air blowing capacity, and the operation of blast furnace A is slightly reduced. It can be seen that the extent of this is very small considering the production reduction of blast furnace B.
このように、本発明における切替え可能な熱風炉ｈは、
通常操業においては高炉Ａ用の熱風炉ａ−１〜ａ−３の
増強を計り、送風能力に余力を持って高炉Ａへ送風する
。In this way, the switchable hot air stove h in the present invention is
During normal operation, the hot blast furnaces a-1 to a-3 for blast furnace A are reinforced and air is blown to blast furnace A with surplus air blowing capacity.
なお、切替え可能な熱風炉ｈは、熱風本管５へ．切替え
熱風炉ｈの熱風弁７を配置された熱風支管８から分岐し
た、両面シール熱風弁１を配置された熱風支管３により
連接されている。Note that the switchable hot air stove h is connected to the hot air main pipe 5. The hot air branch pipe 8 in which the hot air valve 7 of the switching hot air stove h is disposed is branched from the hot air branch pipe 8 in which the hot air valve 7 with double-sided sealing is disposed, and is connected by a hot air branch pipe 3 in which the double-sided sealed hot air valve 1 is disposed.
また、切替え可能な熱風炉ｈは、他の熱風炉と同様なも
のであり、燃焼ガス及び空気の送管から成る燃焼装置９
によって炉内は加熱（蓄熱）され，この時に発生する排
ガスは、煙道弁１０及び排風弁１１を経由して高炉Ａ用
の熱風炉ａ−１〜ａ一３の煙道本管１２に導かれる。In addition, the switchable hot air stove h is similar to other hot air stoves, and has a combustion device 9 consisting of a flue pipe for combustion gas and air.
The inside of the furnace is heated (heat stored), and the exhaust gas generated at this time passes through the flue valve 10 and the exhaust valve 11 to the flue main pipes 12 of the hot blast furnaces a-1 to a-3 for blast furnace A. be guided.
また、高炉Ａへの送風は、まず、切替え冷風弁１３を閉
じた後に加熱された蓄熱室へ高炉Ａ用冷風本管１４ａか
ら分岐した、切替え冷風弁１５と送風弁１６及び充風弁
１７を配置された冷風支管１８とを経由して空気を通じ
、蓄熱室において加熱された熱風は、前記のように、熱
風弁１を経由し、更に高炉Ａ用の熱風本管５を経由して
高炉Ａに送られる。In order to blow air to the blast furnace A, first, after closing the switching cold air valve 13, the switching cold air valve 15, the blower valve 16, and the air filling valve 17, which are branched from the cold air main pipe 14a for the blast furnace A, to the heated heat storage chamber. The hot air heated in the heat storage chamber passes through the cold air branch pipe 18 arranged therein, and as described above, the hot air passes through the hot air valve 1 and further via the hot air main pipe 5 for the blast furnace A to the blast furnace A. sent to.
この場合、熱風の温度は混冷弁１９を経由した冷風によ
り調整される。In this case, the temperature of the hot air is adjusted by the cold air that passes through the mixed cooling valve 19.
なお、本発明における熱風弁１ないし２及び切替冷風弁
１３、１５は、両面シールの弁を使用するものとする。Note that the hot air valves 1 and 2 and the switching cold air valves 13 and 15 in the present invention are double-sided sealed valves.
すなわち、従来の片面シール弁では、例えば、熱風弁に
おいては、熱風支管４に配置された熱風弁２を閉め、高
炉Ａ用の熱風本管５と、高炉Ｂ用の熱風本管６とをしゃ
断するが、この場合、熱風本管５と熱風本管６とにおい
ては管内圧力が異なり、しかも、変化するので、逆に圧
力が加わることもある。That is, in a conventional single-sided seal valve, for example, in a hot air valve, the hot air valve 2 disposed in the hot air branch pipe 4 is closed, and the hot air main pipe 5 for blast furnace A and the hot air main pipe 6 for blast furnace B are shut off. However, in this case, the pressure inside the hot air main pipe 5 and the hot air main pipe 6 is different and changes, so pressure may be applied on the contrary.
このために両面シール弁でないと十分にしゃ断をするこ
とはできない。For this reason, sufficient shutoff cannot be achieved without a double-sided seal valve.
このことは、切替冷風弁１３、１５の場合も同様である
。This also applies to the switching cold air valves 13 and 15.
従って、本発明においては、両面シール弁を使用するこ
とにより、十分にしゃ断することができるようにし、こ
れによって、本発明の目的を達成することができるよう
にし、また、両面シール弁の使用によって、高炉を休風
することなしに、容易に熱風炉の切替えができるように
する。Therefore, in the present invention, by using a double-sided seal valve, it is possible to achieve sufficient shutoff, thereby achieving the object of the present invention, and by using a double-sided seal valve, To easily switch between hot blast furnaces without shutting down the blast furnace.
なお、第４図に示すように、第３図の熱風弁７、送風弁
１６を除き、両面シールの熱風弁１、２と冷風弁１３、
１５及び充風弁１３′、１５′を設ける方法もある。In addition, as shown in FIG. 4, except for the hot air valve 7 and the blower valve 16 shown in FIG.
There is also a method of providing the air supply valve 15 and the air supply valves 13' and 15'.
また、混冷弁１９も図示のように、Ａ， Ｂ各高炉の熱
風炉群に対し、それぞれ１個とすることもできる。Furthermore, as shown in the figure, one mixed cooling valve 19 may be provided for each of the blast furnace groups A and B.
以上のように、本発明の熱風炉装置によると、従来の熱
風炉の休止時における高炉操業の不安定、減産などをな
くし、高炉の生産性を常時最高に保持することができる
という著しい効果が得られる。As described above, the hot blast furnace apparatus of the present invention has the remarkable effect of eliminating the instability of blast furnace operation and production reduction that occur when a conventional hot blast furnace is shut down, and that the productivity of the blast furnace can always be maintained at its highest. can get.
第１図は従来の熱風炉３基による高炉の操炉方法の説明
図、第２図は従来の熱風炉４基による高炉の操炉方法の
説明図、第３図は本発明による熱風炉装置の操業の要領
を示す説明図、第４図は第３図に示す本発明による熱風
炉の操炉方法の実施の要領を示す他の実施例の説明図で
ある。
１、２・・・熱風弁、３、４・・・熱風支管、５、６・
・・熱風本管、７・・・従来の熱風弁、８・・・従来の
熱風支管、９・・・加熱装置、１０・・・煙道弁、１１
・・・排風弁、１２・・・煙道本管、１３、１５・・・
切替え冷風弁、１４・・・冷風本管、１３′、１５′・
・・両面シールの充風弁、１６・・・送風弁、１７・・
・充風弁、１８・・・冷風支管、１９・・・混冷弁、Ａ
， Ｂ・・・高炉、ｈ・・・切替え可能な熱風炉、ａ，
ｂ・・・高炉に附帯する熱風炉。Figure 1 is an explanatory diagram of a conventional blast furnace operating method using three hot blast furnaces, Figure 2 is an explanatory diagram of a conventional blast furnace operating method using four hot blast furnaces, and Figure 3 is a hot blast furnace apparatus according to the present invention. FIG. 4 is an explanatory diagram showing another embodiment of the method of operating a hot blast furnace according to the present invention shown in FIG. 3. 1, 2... Hot air valve, 3, 4... Hot air branch pipe, 5, 6...
...Hot air main pipe, 7.. Conventional hot air valve, 8.. Conventional hot air branch pipe, 9.. Heating device, 10.. Flue valve, 11.
...Exhaust valve, 12...Fue main pipe, 13, 15...
Switching cold air valve, 14... Cold air main, 13', 15'.
・Double-sided sealed air valve, 16...Blower valve, 17...
・Air filling valve, 18... Cold air branch pipe, 19... Mixed cooling valve, A
, B...Blast furnace, h...Switchable hot blast furnace, a,
b...Hot stove attached to the blast furnace.
Claims (1)
帯させ、他の１基の高炉に４基の熱風炉を附帯させ、こ
れらの４基の内の１基を切替え可能として他の高炉に附
帯する熱風炉群の熱風本管と送風本管とに熱風弁を介し
て接続可能であるようにしたことを特徴とする熱風炉装
置。 ２ 熱風弁が、両面シール熱風弁である特許請求の範囲
第１項記載の熱風炉装置。[Scope of Claims] 1. Three hot blast furnaces are attached to one of two adjacent blast furnaces, four hot blast furnaces are attached to the other blast furnace, and one of these four blast furnaces is attached to the other blast furnace. A hot blast furnace apparatus characterized in that one of the blast furnaces is switchable so that it can be connected to a hot air main pipe and a blast main pipe of a hot blast furnace group attached to another blast furnace via a hot air valve. 2. The hot air stove device according to claim 1, wherein the hot air valve is a double-sided sealed hot air valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7450476A JPS596890B2 (en) | 1976-06-25 | 1976-06-25 | hot air stove equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7450476A JPS596890B2 (en) | 1976-06-25 | 1976-06-25 | hot air stove equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS531107A JPS531107A (en) | 1978-01-07 |
| JPS596890B2 true JPS596890B2 (en) | 1984-02-15 |
Family
ID=13549205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7450476A Expired JPS596890B2 (en) | 1976-06-25 | 1976-06-25 | hot air stove equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596890B2 (en) |
-
1976
- 1976-06-25 JP JP7450476A patent/JPS596890B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS531107A (en) | 1978-01-07 |
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