JPS6082781A - Dry and wet type cooling tower - Google Patents
Dry and wet type cooling towerInfo
- Publication number
- JPS6082781A JPS6082781A JP58189348A JP18934883A JPS6082781A JP S6082781 A JPS6082781 A JP S6082781A JP 58189348 A JP58189348 A JP 58189348A JP 18934883 A JP18934883 A JP 18934883A JP S6082781 A JPS6082781 A JP S6082781A
- Authority
- JP
- Japan
- Prior art keywords
- dry
- air
- cooling section
- sections
- type cooling
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/14—Direct-contact trickle coolers, e.g. cooling towers comprising also a non-direct contact heat exchange
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Chimneys And Flues (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、外部空気と温水とを直接熱交換する湿式冷却
部と、外部空気と温水とを間接熱交換言る乾式冷却部と
よりなり、湿式冷却部上に乾式冷却部を設けて湿式冷却
部で生じた湿り空気を乾式冷却部の乾き空気で混合して
排気の白煙化を防止する乾・湿式冷水塔に関するもので
ある。Detailed Description of the Invention The present invention consists of a wet cooling section that directly exchanges heat between external air and hot water, and a dry cooling section that indirectly exchanges heat between external air and hot water. This invention relates to a dry/wet cooling water tower that is provided with a cooling section and mixes humid air generated in the wet cooling section with dry air from the dry cooling section to prevent white smoke from forming in the exhaust gas.
乾・湿式冷水塔は、湿式冷却部で発生する可視プルーム
を低減する有効な手段として開発されたものであり、湿
式冷却部上に乾式冷却部を設置し、被処理温水を乾式冷
却部を通した後、湿式冷却部へ通し、またファンスタッ
クにより乾式及び湿式冷却部に外部空気を導入させ、乾
式冷却部で被処理渇水と外部空気とを間接熱交換させた
のち、その渇水を湿式冷却部で外部空気と直接熱交換さ
せて被処理温水を冷却し、一方湿式冷却部で生じた湿り
空気を乾式冷却部の乾き空気と混合させて排気の白煙化
を防止させるものである。Dry/wet cooling towers were developed as an effective means of reducing visible plumes generated in wet cooling sections.A dry cooling section is installed above the wet cooling section, and the hot water to be treated is passed through the dry cooling section. After that, the dry water is passed through the wet cooling section, and the outside air is introduced into the dry and wet cooling sections using a fan stack, and the dry cooling section performs indirect heat exchange between the dry water to be treated and the outside air. The heated water to be treated is cooled by direct heat exchange with external air, while the humid air generated in the wet cooling section is mixed with dry air in the dry cooling section to prevent the exhaust from turning into white smoke.
この白煙化防止の原理を第４図により説明する。The principle of preventing white smoke formation will be explained with reference to FIG.
第４図において、ｐは飽和温度曲線を示しており、今、
外部空気の乾球温度と絶対湿度とが点ａであるとし、湿
式冷却部を通過した湿り空気が点すにあるとする。この
湿り空気をそのまま排気した場合の排出空気の冷却・拡
散過程は線ａ、ｂで示したように飽和曲線ｐの上方の過
飽和域を通るため冷却と共に涙り空気が凝縮して白煙化
する。この白煙化を防止するために乾式冷却部で点Ｃに
示した乾き空気と、点すの湿り空気とを混合する。これ
により塔内の気流は線ｂｃ上の、例えば点ｄの空気どな
ったどする。この点ｄと外部空気の点ａとを結ぶ線ａｄ
が飽和曲線ｐの下方を通れば大気（外部空気）中に点ｄ
の混合空気を排出しても冷却・拡散過程で白煙化は生じ
ないこととなり、白煙化が防止されることどなる。In Fig. 4, p indicates the saturation temperature curve, and now,
Assume that the dry bulb temperature and absolute humidity of the outside air are at point a, and that the humid air that has passed through the wet cooling section is at point a. When this humid air is exhausted as it is, the cooling and diffusion process of the exhaust air passes through the supersaturation region above the saturation curve p, as shown by lines a and b, so as it cools, the tearing air condenses and becomes white smoke. . In order to prevent this white smoke formation, the dry air shown at point C is mixed with the moist air at point C in the dry cooling section. As a result, the air flow in the tower is caused to become sluggish at point d, for example, on line bc. A line ad connecting this point d and a point a in the external air
If passes below the saturation curve p, then the point d in the atmosphere (external air)
Even if this mixed air is discharged, white smoke will not form during the cooling and diffusion process, and white smoke will be prevented.
しかしながら、乾式冷却部は湿式冷却部に比べて熱効率
が悪く、かつコスト的にも高くなるため小容量のものが
望ましいが、容量が少なくなると白煙化防止が充分に行
なわれなくなる問題がある。However, the dry cooling section has lower thermal efficiency and higher cost than the wet cooling section, so it is desirable to have a small capacity, but if the capacity is small, there is a problem that white smoke cannot be prevented sufficiently.
本発明の目的は、乾式冷却部の容量が少なくとも充分に
白煙化防止が行なえる乾・湿式冷水塔を提供するもので
ある。An object of the present invention is to provide a dry/wet type cooling water tower in which the capacity of the dry type cooling section can at least sufficiently prevent white smoke formation.
本発明は、外部空気と直接熱交換する湿式冷却部上に、
外部空気と間接熱交換する第１の乾式冷却部を設置′Ｊ
る共にその後流側に第２の乾式冷却部を並設し、かつ第
１及び第２の乾式冷却部の高さを相違させて下方で第１
及び第２の乾式冷却部を通過するよう、また上方で第１
及び第２の乾式冷却部の一方を通過するようにしたこと
を特徴とするもので、これにより湿式冷却部からの湿り
空気を第１及び第２の乾式冷却部を通った高温の乾き空
気と混合したのち第１又は第２の乾式冷却部の一方を通
った低温の乾き空気と混合させることにより、少ない乾
き空気で湿り空気の白煙化を防止できるようにしたもの
である。The present invention provides a wet cooling section that directly exchanges heat with external air.
Installed the first dry cooling section that exchanges indirect heat with outside air'J
A second dry cooling section is installed in parallel on the downstream side of the cooling section, and the heights of the first and second dry cooling sections are different, so that the first dry cooling section is installed below.
and the second dry cooling section and the first
and a second dry cooling section, whereby the humid air from the wet cooling section is mixed with the high temperature dry air that has passed through the first and second dry cooling sections. By mixing it with low-temperature dry air that has passed through either the first or second dry cooling section, it is possible to prevent the humid air from turning into white smoke with a small amount of dry air.
以下本発明に係る乾・湿式冷水塔の好適一実施例を添付
図面に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a dry/wet cooling tower according to the present invention will be described below with reference to the accompanying drawings.
第１図において、１は塩化ビニール製のフィルム、或い
は材木を積み重ねて形成した湿式冷却部であり、この湿
式冷却部１を円形、多角形成いは平行に配置する。この
湿式冷却部１の上部には被処理温水を供給する給水槽２
が、下部には冷水の溜る冷水槽３が設けられる。In FIG. 1, reference numeral 1 denotes a wet cooling section formed by stacking vinyl chloride films or lumber, and the wet cooling section 1 is arranged in a circular, polygonal, or parallel arrangement. At the top of this wet cooling unit 1 is a water tank 2 that supplies hot water to be treated.
However, a cold water tank 3 in which cold water is stored is provided at the bottom.
湿式冷却部１の上部には、多数のフィン付き伝熱管より
なる第１の乾式冷却部４と第２の乾式冷却部５とが内外
２段になるよう設置される。外側の第１の乾式冷却部４
と内側の第２の乾式冷却部５の高さは、例えば図示のよ
うに内側の第２の乾式冷却部５の方が第１の乾式冷却部
４より低く形成される。In the upper part of the wet cooling section 1, a first dry cooling section 4 and a second dry cooling section 5, each consisting of a large number of finned heat exchanger tubes, are installed in two stages, inside and outside. First outer dry cooling section 4
The height of the inner second dry cooling section 5 is formed to be lower than the first dry cooling section 4, for example, as shown in the figure.
第１の乾式冷ＮＩ部４上にはファンデツキ６が設けられ
、その中央には外部空気を塔内に導入し、排気づるため
のファンスタック７が設けられる。A fan deck 6 is provided on the first dry cold NI section 4, and a fan stack 7 is provided in the center of the deck for introducing outside air into the tower and exhausting it.
彼処ｕ！渇水は、ヘッダー８より供給管９を通じて第２
の乾式冷却部５へ送られたのち管１０を通じて第１の乾
式冷却部４へ送られ、第２の乾式冷却部５より湿式冷却
部１の給水槽２に供給される。Him place u! In case of drought, the second
After being sent to the dry cooling section 5 of the dry cooling section 5, it is sent to the first dry cooling section 4 through the pipe 10, and is supplied from the second dry cooling section 5 to the water tank 2 of the wet cooling section 1.
尚、図中１１は乾式冷却部４，５の出口側ルーバー、１
２は冷水槽３に接続した冷水管である。In addition, 11 in the figure is the outlet side louver of the dry cooling units 4 and 5;
2 is a cold water pipe connected to the cold water tank 3.
以上において、ファンスタック７により外部空気が湿式
冷却部１を通り、また第１及び第２の乾式冷却部４．５
を通って塔内に導入され、また被処理渇水は、第１の乾
式冷却部５から第２の乾式冷却部４を通り、湿式冷却部
１に供給される。この場合、第１及び第２の乾式冷却部
４，５においてはその高さが相違しており、内側の第２
の乾式冷却部５が外側の第１の乾式冷却部４より低く形
成されるため、矢印１３の如く乾式冷却部の下方５−
を通る外部空気は、第１の乾式冷却部４とイの後流側の
第２の乾式冷却部５の２段を通過し、また、矢印１４の
如く上方を通る外部空気は第１の乾式冷却部４の１段の
みを通過して被処ｉｍ水と間接熱交換することとなる。In the above, the fan stack 7 allows external air to pass through the wet cooling section 1 and the first and second dry cooling sections 4.5.
The dry water to be treated is introduced into the tower through the first dry cooling section 5, passes through the second dry cooling section 4, and is supplied to the wet cooling section 1. In this case, the heights of the first and second dry cooling sections 4 and 5 are different, and the inner second dry cooling section 4 and 5 have different heights.
Since the dry cooling section 5 is formed lower than the first dry cooling section 4 on the outside, the outside air passing through the lower part 5- of the dry cooling section as shown by the arrow 13 flows between the first dry cooling section 4 and the External air passes through two stages of the second dry cooling section 5 on the flow side, and also passes upward as shown by arrow 14, passing through only one stage of the first dry cooling section 4 and indirectly contacting the water to be treated. This will result in heat exchange.
従って乾式冷却部の下方を矢印１５の如く通った外部空
気は矢印１６の外部空気に比べて高温の乾き空気が得ら
れる。Therefore, the outside air passing under the dry cooling section as shown by arrow 15 has a higher temperature than the outside air shown by arrow 16.
湿式冷却部１を矢印１７の如く通る外部空気は、被処理
渇水と直接熱交換して湿り空気となって矢印１８の如く
塔内に入るが、その際に先ず矢印１５の如く流入する高
温の乾き空気と混合されたのちその上方の矢印１．６の
如く流入する低温の乾き空気と混合され、その白煙化が
効果的に防止されファンスタック７より排気される。External air passing through the wet cooling section 1 as shown by the arrow 17 directly exchanges heat with the dry water to be treated, becomes moist air, and enters the tower as shown by the arrow 18. After being mixed with dry air, it is mixed with low-temperature dry air that flows in as shown by the arrow 1.6 above, effectively preventing it from becoming white smoke, and exhausting it from the fan stack 7.
この本発明の白煙化防止の原理を第３図により詳しく説
明する。The principle of preventing white smoke according to the present invention will be explained in detail with reference to FIG.
図において、ｐは飽和曲線で、点ａは矢印１３゜１４．
１７の如く塔内に入る外部空気を、点すは湿式冷却部１
を通った湿り空気を示している。In the figure, p is the saturation curve, and point a is the arrow 13°14.
As shown in 17, the external air entering the tower is heated to the wet cooling section 1.
It shows the humid air passing through.
先ず、矢印１５の如く第１及び第２の乾式冷部６一
部４，５を通った外部空気は点ａから点ｅに昇温されて
高温の乾き空気となり、また矢印１６の如く第１の乾式
冷却部４を通った外部空気は、点ｅより低温の点ｔのご
とき乾き空気が得られる。湿式冷却部１を通過した湿り
空気は先ず点ｅに示す高温の乾き空気と混合される。こ
の場合の混合空気は線ｂｅ上の例えば０点に示し／、：
ｎ合空気となる。次にこの９点の混合空気は点ｆの低温
の乾き空気と混合され、例えば線ｆｌｆ上の点りの混合
空気が得られる。この点１）の混合空気をファンスタッ
ク７より排気するとｗＡａｈに沿って冷却拡散されるこ
ととなる。この各点０．ｈを飽和曲線ｐの下でかつ飽和
曲線ｐよりあまり下がらず飽和曲線ｐに沿うように点ｅ
の高温の乾き空気と、点ｆの低温の乾き空気の温度と容
量を設定すれば、乾き空気の用が従来に化べて少なくと
も湿り空気の白煙化が防止できることとなり、全体の乾
式冷却部の容量が少なくとも白煙化を効果的に防止でき
ることが可能となる。First, as shown by arrow 15, the outside air passing through parts 4 and 5 of the first and second dry cooling sections 6 is heated from point a to point e to become high-temperature dry air, and as shown by arrow 16, The outside air that has passed through the dry cooling section 4 at point t, which has a lower temperature than point e, is obtained as dry air. The humid air that has passed through the wet cooling section 1 is first mixed with high temperature dry air shown at point e. The mixed air in this case is shown for example at the 0 point on the line be/,:
It becomes a joint air. Next, the mixed air at these nine points is mixed with the low-temperature dry air at point f to obtain, for example, mixed air at points on line flf. When the mixed air in point 1) is exhausted from the fan stack 7, it will be cooled and diffused along wAah. Each point is 0. Point e so that h is below the saturation curve p and along the saturation curve p without falling much below the saturation curve p.
By setting the temperature and capacity of the high-temperature dry air at point f and the low-temperature dry air at point f, the use of dry air can be changed to the conventional one, and at least the white smoke of humid air can be prevented, and the entire dry cooling section can be capacity can at least effectively prevent white smoke formation.
上述の実施例では被処理渇水を第２の乾式冷Ｗ部５を通
したのち第１の乾式冷却部４に直列に流す例で説明した
が、本発明はこれに限定されるものでなく、第２図に示
すようにヘッダ８から第１及び第２の乾式冷却部４，５
に夫々管１９．２０を通じて並列に流すように構成して
もよい。また更に第１の乾式冷却部４の方を第２の乾式
冷却部５より高くし、上方の外部空気を第１の乾式冷却
部４のみを通過する例を示したが、外側の第１の乾式冷
却部４を低くし、内側の第２の乾式冷却部５を高くし、
上方が第２の乾式冷却部５のみを通過するように構成し
ても本発明に含まれる。In the above-mentioned embodiment, an example was explained in which the dry water to be treated passes through the second dry cooling section 5 and then flows in series to the first dry cooling section 4, but the present invention is not limited to this. As shown in FIG.
may be configured to flow in parallel through tubes 19 and 20, respectively. Furthermore, an example has been shown in which the first dry cooling section 4 is made higher than the second dry cooling section 5 and the upper external air passes only through the first dry cooling section 4. The dry cooling section 4 is lowered, the inner second dry cooling section 5 is raised,
A configuration in which the upper portion passes only through the second dry cooling section 5 is also included in the present invention.
また、第１、第２の乾式冷却部を通る外部空気を例えば
仕切板により、上下に仕切るようにしても、また、その
上下に流入する外部空気をルーパー１１にて夫々別個に
制御し、その高温の乾き空気と低温の乾き空気の比率を
調節するように構成してもよいことは勿論である。Furthermore, even if the external air passing through the first and second dry cooling sections is partitioned into upper and lower sections using, for example, a partition plate, it is also possible to separately control the external air flowing into the upper and lower sections using the looper 11. Of course, the configuration may be such that the ratio of high-temperature dry air and low-temperature dry air is adjusted.
以上詳）１１シてきたことから明らかなように本発明に
よれば次のごとき優れた効果を発揮する。As is clear from the above (details) 11, the present invention exhibits the following excellent effects.
（１） 乾式冷却部を第１及び第２の２段とし、かつそ
の第１及び第２の乾式冷却部の高さを相違さけて、外部
空気を下方で２段に、上方で１段のみ通過させ、下方で
高温の乾き空気とし、上方で低温の乾き空気とすること
により、湿り空気を先ず高温の乾き空気と混合させたの
ち、低温の乾き空気と混合させることができ、飽和曲線
に沿って効果的な白煙化防止が行なえる。(1) The dry cooling section has two stages, the first and second, and the heights of the first and second dry cooling sections are different, so that the external air is distributed in two stages at the bottom and only one stage at the top. By passing the air through the air, making it hot dry air below and making it cool dry air above, the humid air can first be mixed with the hot dry air and then mixed with the low temperature dry air, and the saturation curve will be reached. Accordingly, effective prevention of white smoke formation can be carried out.
（２１第１及び第２の乾式冷却部の全体の容量を小型化
でき、かつ湿り空気と乾き空気の比率を従来に比べて少
なくすることができるため、冷水塔のコストや通風動力
費共に低くでき経済性が高められる。(21) The overall capacity of the first and second dry cooling sections can be downsized, and the ratio of moist air to dry air can be lowered compared to conventional methods, so the cost of the cooling tower and the ventilation power cost are both low. The economical efficiency can be improved.
第１図は本発明に係る乾・湿式冷水塔の一実施例を示す
正面断面図、第２図は本発明に係る乾・湿式冷水塔の他
の実施例を示す正面断面図、第３図は本発明に係る乾・
湿式冷水塔で白煙化を防止づ−るための原理を説明リ−
るだめのグラフ、第４図は従来の白煙化防止の原理を示
すグラフ９−
である。
図中、１は湿式冷却部、４は第１の乾式冷却部、５は第
２の乾式冷却部である。
特許出願人 石川島播磨重工業株式会社代理人弁理士
絹 谷 信 雄
１０−
第１め
第２図
弔−５図
単２３コと三り臣Ｊ宗−
卓乞球温戻FIG. 1 is a front sectional view showing one embodiment of the dry/wet cooling tower according to the present invention, FIG. 2 is a front sectional view showing another embodiment of the dry/wet cooling tower according to the invention, and FIG. is the drying method according to the present invention.
A guide explaining the principle of preventing white smoke from forming in a wet cooling tower.
Figure 4 is a graph 9 showing the principle of conventional white smoke prevention. In the figure, 1 is a wet cooling section, 4 is a first dry cooling section, and 5 is a second dry cooling section. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinutani 10 - Figure 1, figure 2, condolence - figure 5, 23 singles and three retainers, J-so, table tennis ball warm return
Claims (1)
間接熱交換する第１の乾式冷却部を設けると共にその後
流側に第２の乾式冷却部を並設し、かつ第１及び第２の
乾式冷却部の高さを相違させて外部空気が下方で第１及
び第２の乾式冷却部を通過するよう、また上方で第１及
び第２の乾式冷却部の一方を通過するようにしたことを
特徴とする乾・湿式冷水塔。A first dry cooling section that exchanges heat indirectly with the external air is provided on the wet cooling section that directly exchanges heat with the external air, and a second dry cooling section is arranged in parallel on the downstream side thereof, and the first and second dry cooling sections are arranged in parallel. The heights of the dry cooling sections are different so that the external air passes through the first and second dry cooling sections below, and passes through one of the first and second dry cooling sections above. A dry/wet type cooling water tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58189348A JPS6082781A (en) | 1983-10-12 | 1983-10-12 | Dry and wet type cooling tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58189348A JPS6082781A (en) | 1983-10-12 | 1983-10-12 | Dry and wet type cooling tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6082781A true JPS6082781A (en) | 1985-05-10 |
| JPH0524431B2 JPH0524431B2 (en) | 1993-04-07 |
Family
ID=16239822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58189348A Granted JPS6082781A (en) | 1983-10-12 | 1983-10-12 | Dry and wet type cooling tower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6082781A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7815173B2 (en) * | 2008-04-24 | 2010-10-19 | Yi-Hsiung Lin | Cooler |
| TWI408328B (en) * | 2009-04-16 | 2013-09-11 | Yi Hsiung Lin | Cooler |
| KR101583520B1 (en) | 2015-02-10 | 2016-01-11 | (주)풍천엔지니어링 | plume and power reduction cross flow cooling tower and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5632553A (en) * | 1979-08-28 | 1981-04-02 | Dainippon Toryo Co Ltd | Primary rust preventing coating composition for metal |
| JPS58129176A (en) * | 1982-01-28 | 1983-08-02 | 三菱電機株式会社 | Outdoor unit of air conditioner |
-
1983
- 1983-10-12 JP JP58189348A patent/JPS6082781A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5632553A (en) * | 1979-08-28 | 1981-04-02 | Dainippon Toryo Co Ltd | Primary rust preventing coating composition for metal |
| JPS58129176A (en) * | 1982-01-28 | 1983-08-02 | 三菱電機株式会社 | Outdoor unit of air conditioner |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7815173B2 (en) * | 2008-04-24 | 2010-10-19 | Yi-Hsiung Lin | Cooler |
| TWI408328B (en) * | 2009-04-16 | 2013-09-11 | Yi Hsiung Lin | Cooler |
| KR101583520B1 (en) | 2015-02-10 | 2016-01-11 | (주)풍천엔지니어링 | plume and power reduction cross flow cooling tower and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0524431B2 (en) | 1993-04-07 |
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