JPH0510566B2 - - Google Patents
Info
- Publication number
- JPH0510566B2 JPH0510566B2 JP60186628A JP18662885A JPH0510566B2 JP H0510566 B2 JPH0510566 B2 JP H0510566B2 JP 60186628 A JP60186628 A JP 60186628A JP 18662885 A JP18662885 A JP 18662885A JP H0510566 B2 JPH0510566 B2 JP H0510566B2
- Authority
- JP
- Japan
- Prior art keywords
- air preheater
- air
- temperature
- preheater
- primary
- 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 - Lifetime
Links
- 239000000567 combustion gas Substances 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 6
- 239000003245 coal Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000295 fuel oil Substances 0.000 description 4
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010344 co-firing Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、原動機製品のボイラに適用される空
気予熱システム、殊に１次及び２次の空気予熱器
が組込まれるシステムに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air preheating system applied to a boiler of a motor product, in particular to a system in which primary and secondary air preheaters are incorporated.
従来の技術
従来、石炭−重油焚きボイラ等においては、ユ
ングストローム式又は鋼管式の空気予熱器が一般
的に使用されている。そして、よく知られている
ように、ユングストローム式空気予熱器は波形の
薄鋼板を組み合せて円筒内におさめて伝熱体と
し、これを回転させて燃焼ガスと空気とに交互に
接触させるようにした構造であり、また鋼管式空
気予熱器は鋼管の壁を介して燃焼ガスと空気との
間に熱交換を行わせるようにした構造である。BACKGROUND ART Conventionally, a Ljungström type or steel pipe type air preheater has been generally used in coal-heavy oil fired boilers and the like. As is well known, the Ljungström air preheater is a heat transfer body made by combining corrugated thin steel plates and placing them in a cylinder, which is then rotated to bring it into alternate contact with combustion gas and air. The steel pipe air preheater has a structure in which heat exchange occurs between the combustion gas and the air through the wall of the steel pipe.
また、最近は、内部流体循環式の空気予熱器が
開発されている。この形式の空気予熱器は、例え
ば第２ａ〜２ｃ図に示すように、燃焼ガス側セク
シヨン３１、２次エアセクシヨン３２、１次エア
セクシヨン３３の３個の伝熱セクシヨンより構成
され、下側に燃焼ガス側セクシヨン３１、上側に
２次エアセクシヨン３２及び１次エアセクシヨン
３３を配置し、各々の伝熱セクシヨンには、フイ
ン付鋼管または裸鋼管が配置され、各鋼管１０
は、加熱側、冷却側毎に上下に配置されたヘツダ
ー３６，３７，３８，３９と連結されている。さ
らに、各ヘツダーは、第２ｃ図に示すように、加
熱側セクシヨン下部ヘツダー３６は、冷却側セク
シヨン下部ヘツダー３８と降水管３４で連絡され
ており、また、加熱側セクシヨン上部ヘツダー３
７と冷却側セクシヨン上部ヘツダー３９は、上昇
管３５で連絡されている。 Also, recently, an internal fluid circulation type air preheater has been developed. This type of air preheater is composed of three heat transfer sections: a combustion gas side section 31, a secondary air section 32, and a primary air section 33, as shown in FIGS. 2a to 2c, for example. A side section 31, a secondary air section 32 and a primary air section 33 are arranged on the upper side, and a finned steel pipe or a bare steel pipe is arranged in each heat transfer section.
are connected to headers 36, 37, 38, and 39 arranged above and below for each heating side and cooling side. Furthermore, as shown in FIG. 2c, the heating side section lower header 36 is connected to the cooling side section lower header 38 by a downcomer pipe 34, and the heating side section upper header 3
7 and the cooling side section upper header 39 are connected by a riser pipe 35.
各降水管３４には、水面計４４が設置されてお
り、降水管下部には、給水ライン４１、及びドレ
ンライン４５が設置される。一方、上昇管３５の
上部には、ベントライン４２及び安全弁４３が設
置されている。通常、内部流体としては、水が使
用されるが、高温領域では、水以外の熱媒体も使
用される。 A water level gauge 44 is installed in each downdown pipe 34, and a water supply line 41 and a drain line 45 are installed at the bottom of the downdown pipe. On the other hand, a vent line 42 and a safety valve 43 are installed at the upper part of the riser pipe 35. Usually, water is used as the internal fluid, but in high-temperature regions, heat carriers other than water are also used.
しかして、このような閉ループにおいて、水
（又は熱媒）は、加熱側、冷却側で、蒸発、凝縮
を繰返し、自然循環系統を形成することにより、
加熱側で吸収された熱量は、冷却側で放出され、
燃焼ガスと空気が全く接触することなく、熱伝達
が可能となる。 In such a closed loop, water (or heat medium) repeats evaporation and condensation on the heating side and cooling side, forming a natural circulation system.
The amount of heat absorbed on the heating side is released on the cooling side,
Heat transfer is possible without any contact between combustion gas and air.
発明が解決しようとする問題点
以上述べた従来の空気予熱器においては、しか
し、次に述べるような問題があつた。Problems to be Solved by the Invention The conventional air preheater described above, however, had the following problems.
ユングストローム式及び鋼管式の空気予熱器の
場合には、低温部のメタル温度Tmが入口空気温
度（大気温度）Taと排ガス温度Tgとの平均値、
すなわちTm＝１／２（Tg−Ta）で決まるので、例
えばTa＝20℃、石炭焚き時の目標Tmを低温腐
食防止のために70℃とすれば、Tg＝120℃とな
り、Tgをこれ以下に下げられず、これがボイラ
効率のアツプ化の妨げとなつている。 In the case of Jungstrom type and steel pipe type air preheaters, the metal temperature Tm of the low temperature section is the average value of the inlet air temperature (atmospheric temperature) Ta and the exhaust gas temperature Tg,
In other words, it is determined by Tm = 1/2 (Tg - Ta), so for example, if Ta = 20℃ and the target Tm for coal firing is 70℃ to prevent low-temperature corrosion, then Tg = 120℃, and Tg must be lower than this. This is an impediment to increasing boiler efficiency.
一方、内部流体循環式の空気予熱器において
は、低温部の伝熱管をホウ硅酸ガラス等の耐蝕性
ガラス又はポリテトラフルオロエチレン等の耐蝕
性プラスチツクの材料で形成して、低温部の材質
温度を酸露点以下に下げることはできるが、しか
し、この場合にはガラス等の熱伝導率の悪さ、材
質的もろさ等の欠点がある。 On the other hand, in an internal fluid circulation type air preheater, the heat exchanger tube in the low temperature section is made of a corrosion-resistant glass such as borosilicate glass or a corrosion-resistant plastic material such as polytetrafluoroethylene, so that the material temperature of the low temperature section is It is possible to lower the temperature below the acid dew point, but in this case, there are disadvantages such as poor thermal conductivity of glass etc. and fragility of the material.
そこで、本発明は、このような従来の問題点を
解決するためになされたもので、空気予熱器低温
部での酸腐蝕及び空気予熱器の後流に続く電気集
塵器等の付属機器の酸腐蝕の防止を計りながら、
ボイラプラントとして石炭−重油の混焼条件に応
じて最高効率の運用を可能とすることを目的とす
る。 Therefore, the present invention was made to solve these conventional problems, and it prevents acid corrosion in the low-temperature section of the air preheater and the damage to attached equipment such as an electrostatic precipitator downstream of the air preheater. While trying to prevent acid corrosion,
The purpose is to enable maximum efficiency operation as a boiler plant depending on the co-firing conditions of coal and heavy oil.
問題点を解決するための手段
本発明は、空気予熱システムにおいて、燃焼ガ
ス流れの高温側に２次空気予熱器を配置するとと
もに、この２次空気予熱器の下流側に内部流体循
環式の１次空気予熱器を配置し、空気通路を空気
が１次空気予熱器及び２次空気予熱器の順に流れ
るように連結するとともに、１次空気予熱器の空
気入口部の上流側で分岐して、２次空気予熱器の
下流側に連通するバイパス通路を設け、このバイ
パス通路に１次空気予熱器の内部流体の温度と１
次空気予熱器から出る燃焼ガスの温度とに基づい
て作動する流量調整手段を配置したものである。Means for Solving the Problems The present invention provides an air preheating system in which a secondary air preheater is disposed on the high temperature side of the combustion gas flow, and an internal fluid circulation type air preheater is disposed downstream of the secondary air preheater. A secondary air preheater is arranged, the air passage is connected so that air flows through the primary air preheater and the secondary air preheater in that order, and is branched on the upstream side of the air inlet of the primary air preheater, A bypass passage communicating with the downstream side of the secondary air preheater is provided, and the temperature of the internal fluid of the primary air preheater and the
A flow rate adjusting means is provided that operates based on the temperature of the combustion gas coming out of the secondary air preheater.
作 用
このような手段によれば、１次空気予熱器とし
て内部流体循環式のものを用いているので、その
伝熱管を形成する金属管の低温部メタル温度を酸
露点以上に保ちながら、燃焼ガス温度を最小限ま
で下げ、その分ボイラ効率の上昇が可能となる。
また、かかる金属管として一般に鋼管を使用でき
るので、熱伝導率の悪い等の欠点があるガラス等
の特殊材質からなる管の使用を避けることができ
る。Effect According to this method, since an internal fluid circulation type is used as the primary air preheater, the temperature of the low-temperature part of the metal tube forming the heat transfer tube is maintained above the acid dew point while combustion is being carried out. It is possible to lower the gas temperature to the minimum and increase boiler efficiency accordingly.
Furthermore, since steel pipes can generally be used as such metal pipes, it is possible to avoid the use of pipes made of special materials such as glass, which have drawbacks such as poor thermal conductivity.
実施例
以下図面を参照して本発明の一実施例について
記述する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明による空気予熱システムを組
み込んだボイラの一例を示す。 FIG. 1 shows an example of a boiler incorporating an air preheating system according to the invention.
この図において、押込通風機１より供給された
空気は、１次空気予熱器入口エア系統２を通して
内部流体循環式の１次空気予熱器３に供給され、
この部分で後述する燃焼ガスと熱交換を行い、加
熱される。この１次空気予熱器３は、燃焼ガス流
れの高温側に配置されているユングストローム式
又は鋼管式の２次空気予熱器４の下流側に配置さ
れている。 In this figure, air supplied from a forced draft fan 1 is supplied to an internal fluid circulation type primary air preheater 3 through a primary air preheater inlet air system 2.
This part exchanges heat with combustion gas, which will be described later, and is heated. This primary air preheater 3 is arranged downstream of a secondary air preheater 4 of the Ljungström or steel tube type, which is arranged on the high temperature side of the combustion gas flow.
１次空気予熱器３で加熱されて高温となつた空
気は、それから、２次空気予熱器４とミルテンパ
リングエア系統５とに分けられる。そして、２次
空気予熱器４で更に加熱された高温空気はホツト
エア系統６を通して流れ、その一部は２次エア供
給系統７を通して火炉８内に導入され、またその
残りはミル用の１次エアとしてミルテンパリング
エア系統５及びその流量調整ダンパ９を通して流
れてきた空気と混合した後１次エアフアン１０に
よりミル１１に供給される。 The air heated to a high temperature by the primary air preheater 3 is then divided into a secondary air preheater 4 and a mill tempering air system 5. The high-temperature air further heated by the secondary air preheater 4 flows through the hot air system 6, a part of which is introduced into the furnace 8 through the secondary air supply system 7, and the rest is used as the primary air for the mill. After being mixed with the air flowing through the mill tempering air system 5 and its flow rate adjusting damper 9, it is supplied to the mill 11 by the primary air fan 10.
また、１次空気予熱器３の空気入口部の上流側
すなわち入口エア系統２から分岐されたバイパス
通路１２が２次空気予熱器４の下流側すなわちホ
ツトエア系統６に連通して設けられ、押込通風機
１からの供給空気の一部がこのバイパス通路１２
及びバイパスエア流量調整ダンパ１３を通してホ
ツトエア系統６内の高温空気と合流できるように
なつている。 Further, a bypass passage 12 branched from the air inlet section of the primary air preheater 3, that is, the inlet air system 2, is provided to communicate with the downstream side of the secondary air preheater 4, that is, the hot air system 6. A portion of the air supplied from the machine 1 flows through this bypass passage 12.
The high temperature air in the hot air system 6 can be merged with the high temperature air through the bypass air flow rate adjusting damper 13.
このバイパスエア流量調整ダンパ１３は、１次
空気予熱器３の内部流体の温度を検出する温度計
１４と１次空気予熱器３から出る燃焼ガスの温度
を検出する温度計１５とからの各検出信号を受け
る制御器１６によつて制御される。これにより、
１次空気予熱器３の低温部メタル温度又は燃焼ガ
スの温度が石炭−重油混焼比に応じて要求される
値となるように、エアバイパス量を制御すること
ができる。 This bypass air flow rate adjustment damper 13 receives each detection from a thermometer 14 that detects the temperature of the internal fluid of the primary air preheater 3 and a thermometer 15 that detects the temperature of the combustion gas coming out of the primary air preheater 3. It is controlled by a controller 16 which receives the signal. This results in
The amount of air bypass can be controlled so that the low-temperature part metal temperature of the primary air preheater 3 or the temperature of the combustion gas becomes a value required according to the coal-heavy oil co-combustion ratio.
一方、コールバンカ１７からミル１１に供給さ
れた石炭は、１次エアフアン１０によりミル内に
導入された空気によつて粉砕、乾燥され、それか
ら微粉炭供給系統１８を通してバーナより火炉８
内に投入され、燃焼される。その燃焼ガスは、対
流伝熱セクシヨン１９を通過した後、節炭器出口
排ガス系統２０を通して２次空気予熱器４、１次
空気予熱器３、電気集じん器２１及び誘引通風機
２２を通過して煙突２３から大気に排出される。 On the other hand, the coal supplied from the coal bunker 17 to the mill 11 is pulverized and dried by air introduced into the mill by the primary air fan 10, and then passed through the pulverized coal supply system 18 to the burner to the furnace 8.
is thrown into the interior and burned. After passing through the convection heat transfer section 19, the combustion gas passes through the economizer outlet exhaust gas system 20, the secondary air preheater 4, the primary air preheater 3, the electrostatic precipitator 21 and the induced draft fan 22. and is discharged into the atmosphere from the chimney 23.
しかして、１次空気予熱器３として使用した内
部流体循環式の空気予熱器は、２次空気予熱器４
として使用したユングストローム式又は鋼管式の
空気予熱器に比較して、第３図（内部流体循環
式）及び第４図（ユングストローム式）に示すよ
うに、メタル温度の点で有利な点がある。すなわ
ち、内部流体循環式の空気予熱器では、その入口
空気温度Taとは直接関係なく、低温部の平均メ
タル温度Tm（内部流体温度＋２〜３℃）を燃焼
ガスTg側に近づけて設計可能であるし、また運
転も可能なものである。 Therefore, the internal fluid circulation type air preheater used as the primary air preheater 3 is different from the secondary air preheater 4.
Compared to the Jungström type or steel pipe type air preheater used as be. In other words, with an internal fluid circulation type air preheater, it is possible to design the average metal temperature Tm (internal fluid temperature + 2 to 3°C) of the low temperature part to be closer to the combustion gas Tg side, regardless of the inlet air temperature Ta. Yes, it is possible to drive.
発明の効果
以上詳述したように、本発明によれば、１次空
気予熱器として伝熱管を金属管通常は鋼管で形成
し得る内部流体循環式のものを使用しているの
で、ガラス等の特殊材質の伝熱管を使用すること
なく、例えば石炭専焼時には酸露点50〜80℃に対
して、１次空気予熱器の低温部メタル温度を約90
℃にキープしながら、燃焼ガス温度を約100℃程
度まで下げることができる。したがつて、これに
より、１次及び２次の空気予熱器の両方をユング
ストローム式として燃焼ガス温度を120〜130℃と
した場合に比べ、ボウラ効率を約1.3〜1.5％上昇
することができる。Effects of the Invention As detailed above, according to the present invention, since the heat exchanger tube as the primary air preheater is of an internal fluid circulation type that can be formed of a metal tube, usually a steel tube, Without using heat exchanger tubes made of special materials, for example, when burning coal exclusively, the temperature of the low temperature metal part of the primary air preheater can be kept at about 90℃, compared to the acid dew point of 50 to 80℃.
It is possible to lower the combustion gas temperature to approximately 100℃ while maintaining the temperature at ℃. Therefore, this makes it possible to increase the bowler efficiency by approximately 1.3 to 1.5% compared to when both the primary and secondary air preheaters are of the Jungström type and the combustion gas temperature is set at 120 to 130°C. .
また、この１次空気予熱器の低温部メタル温度
又は燃焼ガス温度は１次及び２次の空気予熱器を
バイパスする空気の量を変えることにより制御す
ることができる。しかがつて、例えば重油専焼時
には電気集じん器の酸腐蝕等をさけるために燃焼
ガス温度を石炭専焼時等に比べて大幅に上昇させ
る必要があるが、このようなことも該空気バイパ
ス方式によつて最も効果的にかつ簡単に行うこと
ができる。 Also, the low temperature metal temperature or combustion gas temperature of the primary air preheater can be controlled by changing the amount of air that bypasses the primary and secondary air preheaters. However, for example, when burning only heavy oil, it is necessary to raise the combustion gas temperature significantly compared to when burning only coal to avoid acid corrosion of the electrostatic precipitator, but this also applies to the air bypass method. Therefore, it can be done most effectively and easily.
第１図は本発明による空気予熱システムを組み
込んだボイラの一例を示す系統図、第２ａ図は本
発明にしたがつて１次空気予熱器として使用され
る内部流体循環式の空気予熱器の一例を示す正面
図、第２ｂ図はその側面図、第２ｃ図はその内部
流体流れ系統図、第３図及び第４図はそれぞれ内
部流体循環式及びユングストローム式の空気予熱
器における低温部の平均メタル温度と空気温度及
び燃焼ガス温度との関係を示す図である。
３……１次空気予熱器、４……２次空気予熱
器、８……火炉、１１……ミル、１２……バイパ
ス通路、１３……バイパスエア流量調整ダンパ、
１４，１５……温度計、１６……制御器。
FIG. 1 is a system diagram showing an example of a boiler incorporating an air preheating system according to the present invention, and FIG. 2a is an example of an internal fluid circulation type air preheater used as a primary air preheater according to the present invention. Figure 2b is a side view, Figure 2c is an internal fluid flow diagram, and Figures 3 and 4 are averages of low-temperature parts in internal fluid circulation type and Jungstrom type air preheaters, respectively. It is a figure showing the relationship between metal temperature, air temperature, and combustion gas temperature. 3...Primary air preheater, 4...Secondary air preheater, 8...Furnace, 11...Mill, 12...Bypass passage, 13...Bypass air flow rate adjustment damper,
14, 15...Thermometer, 16...Controller.
Claims (1)
置するとともに、この２次空気予熱器の下流側に
内部流体循環式の１次空気予熱器を配置し、空気
通路を空気が１次空気予熱器及び２次空気予熱器
の順に流れるように連結するとともに、１次空気
予熱器の空気入口部の上流側で分岐して、２次空
気予熱器の下流側に連通するバイパス通路を設
け、このバイパス通路に１次空気予熱器の内部流
体の温度と１次空気予熱器から出る燃焼ガスの温
度とに基づいて作動する流量調整手段を配置して
なる空気予熱システム。1. A secondary air preheater is placed on the high temperature side of the combustion gas flow, and an internal fluid circulation type primary air preheater is placed downstream of this secondary air preheater, so that the air passes through the air passage and is connected to the primary air. A bypass passage is provided that connects the preheater and the secondary air preheater in order to flow, and branches on the upstream side of the air inlet portion of the primary air preheater and communicates with the downstream side of the secondary air preheater, An air preheating system in which a flow rate adjusting means that operates based on the temperature of the internal fluid of the primary air preheater and the temperature of the combustion gas exiting from the primary air preheater is disposed in the bypass passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60186628A JPS6249118A (en) | 1985-08-27 | 1985-08-27 | Air preheating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60186628A JPS6249118A (en) | 1985-08-27 | 1985-08-27 | Air preheating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6249118A JPS6249118A (en) | 1987-03-03 |
| JPH0510566B2 true JPH0510566B2 (en) | 1993-02-10 |
Family
ID=16191905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60186628A Granted JPS6249118A (en) | 1985-08-27 | 1985-08-27 | Air preheating system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6249118A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4959156B2 (en) | 2004-11-29 | 2012-06-20 | 三菱重工業株式会社 | Heat recovery equipment |
| CN105090929B (en) * | 2015-08-28 | 2017-04-19 | 山东英电环保科技有限公司 | Hot primary air waste-heat utilization device used by being coupled with low-pressure economizer |
| CN110986077A (en) * | 2019-12-26 | 2020-04-10 | 润电能源科学技术有限公司 | Coal-fired unit heat utilizes system |
-
1985
- 1985-08-27 JP JP60186628A patent/JPS6249118A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6249118A (en) | 1987-03-03 |
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