JPH0881682A - On-board dust collector for coke oven coal car - Google Patents
On-board dust collector for coke oven coal carInfo
- Publication number
- JPH0881682A JPH0881682A JP21842494A JP21842494A JPH0881682A JP H0881682 A JPH0881682 A JP H0881682A JP 21842494 A JP21842494 A JP 21842494A JP 21842494 A JP21842494 A JP 21842494A JP H0881682 A JPH0881682 A JP H0881682A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- gas
- valve
- duct
- vehicle
- 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
- Separation Of Particles Using Liquids (AREA)
- Coke Industry (AREA)
Abstract
(57)【要約】
【目的】 コークス装炭車に搭載された車上集塵装置の
異常による可燃性集塵ガスの爆発を未然に防止する。
【構成】 装炭車上に搭載した車上集塵装置に異常が発
生した場合に、可燃性集塵ガスの爆発を未然に防止する
ため、放散ダクト23の放散弁18を開放して集塵ガスを大
気中に放散すると共に、遮断弁17を閉じて湿式除塵器12
に集塵ガスが流入するのを遮断する。それと共に、希釈
弁24を開いて希釈ダクト24から湿式除塵器12より下流側
に空気を導入して集塵ガスを希釈することにより集塵ガ
スの爆発を防止する。
(57) [Summary] [Purpose] To prevent the explosion of flammable dust-collecting gas due to an abnormality in the on-vehicle dust collector installed in the coke-fueled coal vehicle. [Constitution] To prevent explosion of combustible dust collection gas when an abnormality occurs in the on-board dust collection device mounted on the coal-loaded vehicle, open the diffusion valve 18 of the diffusion duct 23 to collect dust collection gas. Of the wet type dust remover 12
Block the inflow of dust collecting gas. At the same time, the dilution valve 24 is opened and air is introduced from the dilution duct 24 to the downstream side of the wet dust remover 12 to dilute the dust collecting gas, thereby preventing the dust collecting gas from exploding.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コークス炉の炭化室に
石炭を装入する際、装入口から大気に噴出するガスを装
炭車に設けられた集塵フードで集塵して処理するコーク
ス炉装炭車の車上集塵装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke which, when charging coal into a carbonization chamber of a coke oven, collects gas from a charging port into the atmosphere by a dust collecting hood provided in a coal car to process the coke. The present invention relates to an on-vehicle dust collector for a coal-fired car.
【０００２】[0002]
【従来の技術】一般に、コークス炉に配列された炭化室
に石炭を装入する場合、図２に示すように炭化室１の長
手方向頂部に設けた複数の装入口22に対応して装炭車20
に搭載された装炭ホッパ５内に貯めてある石炭をフィー
ダ21を用いて切り出し、テレスコープ式に伸縮する装入
シュート２を装入口22に当接して炭化室１内に装入す
る。2. Description of the Related Art Generally, when coal is charged into a carbonization chamber arranged in a coke oven, as shown in FIG. 2, a coal car is provided corresponding to a plurality of charging ports 22 provided at the top in the longitudinal direction of the carbonization chamber 1. 20
The coal stored in the coal charging hopper 5 mounted on is cut out using the feeder 21, and the charging chute 2 which telescopically expands and contracts is brought into contact with the charging port 22 and charged into the carbonization chamber 1.
【０００３】炭化室１内は高温に加熱されているため、
炭化室１内に装入された石炭は急激に加熱されて可燃性
ガスを発生し、装入口22から大気中にガスおよび粉塵が
放出される。このような装入口22への装炭時に噴出する
ガスおよび粉塵を集塵するため、装炭車20に昇降自在な
集塵フード３を、装入口22に当接した装入シュート２の
周囲に降下して噴出ガスを捕集するようになっている。Since the inside of the carbonization chamber 1 is heated to a high temperature,
The coal charged in the carbonization chamber 1 is rapidly heated to generate a combustible gas, and the gas and dust are discharged from the charging port 22 into the atmosphere. In order to collect the gas and dust ejected at the time of coal charging to the charging port 22, the dust collecting hood 3 that can move up and down on the coal charging car 20 is lowered around the charging chute 2 that is in contact with the charging port 22. Then, the spouted gas is collected.
【０００４】このようにして捕集したガスは、可燃分を
含有しているので集塵フード３の箇所に配設した点火バ
ーナ４に空気ファン７から燃焼用空気を供給すると共
に、LPG ボンベ８からLPG ガスを供給して点火し、該ガ
ス中の可燃分を燃焼して不活性な状態にすることによっ
て下流側で可燃性ガスが爆発するのを防止している。各
集塵フード３内で燃焼したガスは集塵ダクト６を経由し
てまず湿式除塵器12に導かれる。湿式除塵器12内には散
水ノズル11が設置してあり、湿式除塵器12内に導かれた
ガスは、散水タンク９から散水ポンプ10を介して供給さ
れる水を散水ノズル11から散水することによってガス中
の粉塵が取り除かれる。Since the gas thus collected contains combustible components, the combustion air is supplied from the air fan 7 to the ignition burner 4 arranged at the dust collecting hood 3, and the LPG cylinder 8 is also provided. The LPG gas is supplied from the above to ignite it, and combustible components in the gas are burned to make it inactive, thereby preventing the flammable gas from exploding on the downstream side. The gas burned in each dust collecting hood 3 is first guided to the wet dust remover 12 via the dust collecting duct 6. A water spray nozzle 11 is installed in the wet dust remover 12, and the gas introduced into the wet dust remover 12 is to spray the water supplied from the water spray tank 9 through the water spray pump 10 from the water spray nozzle 11. The dust in the gas is removed by.
【０００５】湿式除塵器12で除塵されたガスは、次に遠
心分離器13に導かれ、ここでガス中の水滴などが遠心分
離された後、ガス昇圧ファン14を経由し、装炭車20に配
設してある接続・離脱自在な連結管15を介して固定して
設置してある集合集塵ダクト16に導かれる。この集合集
塵ダクト16から地上に設置した大型集塵装置（図示せ
ず）に導かれ、ここでさらに細かい粉塵が集塵処理され
る（たとえば特開平４−346810号公報参照）。The gas dedusted by the wet type dust remover 12 is then guided to a centrifugal separator 13, where water droplets in the gas are centrifuged, and then passed through a gas booster fan 14 to a coal car 20. It is guided to a collective dust collecting duct 16 which is fixedly installed via a connecting / disconnecting connecting pipe 15 provided. From this collective dust collecting duct 16, it is guided to a large-scale dust collecting device (not shown) installed on the ground, and finer dust is collected there (see, for example, JP-A-4-346810).
【０００６】[0006]
【発明が解決しようとする課題】前記図２に示す従来技
術においては、装炭車20に搭載した車上集塵装置25内で
集塵ガスの可燃成分（Ｈ2 、CO、CH4 ）および粉塵によ
る爆発の危険性がある。なぜならば集塵フード３で捕集
した集塵ガスに点火バーナ４を用いて該ガスを点火させ
てもすべての可燃分を燃焼できないこともあって、下記
の異常があった場合には、爆発の確率が上がることにな
る。万一大規模な爆発が発生すると装置を破壊するため
被害が大きくなるばかりでなく、その復旧工事の増加な
らびにその間は集塵できないため、公害問題が顕在化す
るという問題があった。In the prior art shown in FIG. 2, the combustible components (H 2 , CO, CH 4 ) and dust in the dust collecting gas are collected in the on-vehicle dust collecting device 25 mounted on the coal charging vehicle 20. There is a risk of explosion due to. Because all the combustible components cannot be burned even if the dust collecting gas collected by the dust collecting hood 3 is ignited by using the ignition burner 4, and if the following abnormality occurs, an explosion occurs. The probability of will increase. In the unlikely event that a large-scale explosion occurs, the equipment will be destroyed and the damage will increase. In addition, there will be an increase in the amount of restoration work and dust cannot be collected during that time, which causes a problem of pollution.
【０００７】（１）点火バーナ４に燃焼用空気を供給す
る空気ファン７が装炭中に故障し、捕集したガスが点火
バーナ４で点火されなかった場合、大量の可燃性ガスが
下流に流れて爆発する。 （２）湿式除塵器12に水を供給する散水ポンプ10が装炭
中に故障し、散水ノズル11から散水されなかった場合、
ガスの温度が上昇し、火の粉を消化できないので湿式除
塵器12や遠心分離器13等内で爆発する。(1) When the air fan 7 for supplying the combustion air to the ignition burner 4 fails during carbonization and the collected gas is not ignited by the ignition burner 4, a large amount of combustible gas flows downstream. It flows and explodes. (2) When the water spray pump 10 that supplies water to the wet dust remover 12 fails during carbonization and water is not sprayed from the water spray nozzle 11,
Since the temperature of the gas rises and the powder of fire cannot be digested, it explodes in the wet dust remover 12, the centrifugal separator 13 and the like.
【０００８】（３）ガス昇圧ファン14が装炭中に故障に
より停止した場合、可燃性ガスが湿式除塵器12等の内部
に滞留して爆発する。 本発明は、前述のような装炭車20に搭載された車上集塵
装置25の異常による爆発の危険を防止することができる
コークス炉装炭車20の車上集塵装置を提供することを目
的とするものである。(3) When the gas booster fan 14 stops due to a failure during carbonization, flammable gas accumulates inside the wet dust remover 12 and explodes. An object of the present invention is to provide an on-vehicle dust collector for a coke oven coal-fired vehicle 20 that can prevent the risk of explosion due to an abnormality in the on-vehicle dust collector 25 mounted on the above-described coal-fired vehicle 20. It is what
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するため
の本発明は、コークス炉への装炭中に装入口から噴出す
るガスを捕集するため昇降可能に設けた集塵フードに点
火バーナを備え、前記集塵フードに連通する集塵ダクト
に湿式除塵器およびガス昇圧ファンを備えたコークス炉
装炭車の車上集塵装置において、前記湿式除塵器の入側
における集塵ダクトに遮断弁を配設すると共に、この遮
断弁の上流側における集塵ダクトから分岐された放散ダ
クトに放散弁を配設する一方、前記湿式除塵器に大気を
導入する希釈ダクトに希釈弁を配設し、集塵ガスの異常
時に前記遮断弁を閉に作動させると共に、放散弁および
希釈弁を開に作動して集塵ガスの爆発を未然に防止する
ように構成したことを特徴とするコークス炉装炭車の車
上集塵装置である。SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to an ignition burner provided on a dust collecting hood which is vertically movable to collect gas ejected from a charging port during charging of a coke oven. And a dust collecting duct communicating with the dust collecting hood with a wet dust remover and a gas booster fan on-vehicle dust collector of a coke oven coal-fired vehicle, wherein a shut-off valve is provided in the dust collecting duct on the inlet side of the wet dust remover. While arranging, while disposing the diffusion valve in the diffusion duct branched from the dust collection duct on the upstream side of the shutoff valve, the dilution valve is disposed in the dilution duct for introducing the atmosphere into the wet dust remover, A coke oven coal car, characterized in that when the dust collecting gas is abnormal, the shutoff valve is closed and the diffusion valve and the dilution valve are opened to prevent the dust collecting gas from exploding. This is the on-vehicle dust collector
【００１０】[0010]
【作用】本発明では、装炭車に搭載した車上集塵装置が
正常な場合には、遮断弁−全開、放散弁−全閉、希釈弁
−全閉として前述従来装置と同様のガス流れによって集
塵が達成できる。一方、車上集塵装置が異常停止した場
合、その異常停止信号を受け、これによって放散弁を閉
から開に作動し爆発性ガスを放散ダクトから大気中に逃
し、遮断弁を開から閉に作動して温式集塵器への爆発性
ガスを遮断すると共に、希釈弁を閉から開にして、それ
まで湿式除塵器以降に滞留していた爆発性ガスを希釈ダ
クトから導入される空気によって希釈することによって
湿式除塵器以降での爆発を防止するものである。According to the present invention, when the on-vehicle dust collector mounted on the coal-coated vehicle is normal, the shutoff valve-fully opened, the diffusion valve-fully closed, and the dilution valve-fully closed by the same gas flow as the above-mentioned conventional device. Dust collection can be achieved. On the other hand, when the on-vehicle dust collector stops abnormally, the abnormal stop signal is received, which causes the diffusion valve to operate from closed to open, explosive gas to escape from the diffusion duct to the atmosphere, and the shutoff valve to open. It operates to shut off the explosive gas to the hot dust collector, closes and opens the dilution valve, and expels the explosive gas accumulated after the wet dust remover by the air introduced from the dilution duct. Dilution prevents explosion after the wet dust remover.
【００１１】[0011]
【実施例】以下、本発明の実施例を図１の基いて説明す
る。図１において図２に示す従来装置と同じものは、同
一符号を示して説明が重複するのを省略する。図１に示
すように本発明では、装炭車20に搭載された湿式除塵器
12の入側における集塵ダクト６に遮断弁17を配設すると
共に、この遮断弁17の上流側における集塵ダクト６から
分岐させた放散ダクト23に放散弁18を配設する。また湿
式除塵器12に大気を導入する希釈ダクト24に希釈弁19を
配設するものである。EXAMPLE An example of the present invention will be described below with reference to FIG. In FIG. 1, the same parts as those of the conventional device shown in FIG. 2 are designated by the same reference numerals and duplicate explanations are omitted. As shown in FIG. 1, according to the present invention, a wet dust remover mounted on a coal charging vehicle 20.
A cutoff valve 17 is arranged in the dust collecting duct 6 on the inlet side of the 12 and a diffusion valve 18 is arranged in the diffusion duct 23 branched from the dust collecting duct 6 on the upstream side of the cutoff valve 17. Further, the dilution valve 19 is arranged in the dilution duct 24 for introducing the atmosphere into the wet dust remover 12.
【００１２】装炭車20に搭載した車上集塵装置25が正常
な場合には、装炭ホッパ５から装入口22を介して炭化室
１に石炭を装入中には、遮断弁17は開、放散弁18および
希釈弁19は閉となっている。したがって装入口22から噴
出する可燃性ガスは、集塵フード３で捕集された後、点
火バーナ４により点火され燃焼したガスは、従来と同様
に湿式除塵器12、遠心分離器13、ガス昇圧ファン14およ
び連結管15を介して地上側の集合集塵ダクト16に導かれ
る。When the on-board dust collector 25 mounted on the coal car 20 is normal, the shut-off valve 17 is opened while coal is being charged from the coal hopper 5 into the carbonization chamber 1 through the charging port 22. The diffusion valve 18 and the dilution valve 19 are closed. Therefore, the combustible gas ejected from the charging port 22 is collected by the dust collecting hood 3 and then ignited by the ignition burner 4 and burned. The gas is the wet dust remover 12, the centrifugal separator 13, and the gas pressure booster as in the conventional case. It is guided to the collective dust collecting duct 16 on the ground side through the fan 14 and the connecting pipe 15.
【００１３】本発明では、たとえば下記の場合に車上集
塵装置25が異常であると判定し、これに基いて遮断弁1
7、放散弁18および希釈弁19を安全サイド側に作動する
のである。 （１）空気ファン７の異常停止 空気ファン７から点火バーナ４に燃焼用空気が供給され
ないため点火されず、LPG のみが噴射されると共に捕集
したガスが燃焼しないため大量の可燃性ガスが下流側に
流れ、湿式除塵器12等で爆発する確率が大。In the present invention, for example, the on-vehicle dust collector 25 is determined to be abnormal in the following cases, and the shutoff valve 1
7. The diffusion valve 18 and the dilution valve 19 are operated on the safe side. (1) Abnormal stop of the air fan 7 Since the combustion air is not supplied from the air fan 7 to the ignition burner 4, it is not ignited, and only LPG is injected and the collected gas does not burn, so a large amount of combustible gas flows downstream. There is a high probability that it will flow to the side and explode with a wet dust remover 12.
【００１４】（２）散水ポンプ10の異常停止 散水ポンプ10から水が供給されないため散水ノズル11か
ら散水されず、湿式除塵器12内のガス温度が上昇し、火
の粉が消火されないので湿式除塵器12内で爆発する確率
が大。 （３）ガス昇圧ファン14の異常停止 ガス昇圧ファン14によりガスが排出されないので、湿式
除塵器12内に可燃性ガスが滞留するため爆発する確率が
大。(2) Abnormal stop of the water spray pump 10 Since water is not supplied from the water spray pump 10, water is not sprayed from the water spray nozzle 11, the gas temperature inside the wet dust remover 12 rises, and the sparks are not extinguished, so the wet dust remover 12 There is a high probability that it will explode inside. (3) Abnormal stop of the gas booster fan 14 Since gas is not discharged by the gas booster fan 14, flammable gas stays in the wet dust remover 12, so there is a high probability of explosion.
【００１５】なお、本発明では必要に応じ前記以外にも
異常に判定基準を新たに追加することも可能である。前
記のように空気ファン７、散水ポンプ10またはガス昇圧
ファン14が異常停止したら、その停止信号により直ちに
放散弁18を閉から開に作動して、爆発の危険がある可燃
性ガスを放散ダクト23から大気中に放散する。そして遮
断弁17を開から閉に作動して、湿式除塵器12に可燃性ガ
スが流入するのを遮断する。それと同時に希釈弁19を閉
から開に作動し、希釈ダクト24から空気を導入すること
によって、それまでに湿式除塵器12以降に滞留していた
可燃性ガスを希釈してその爆発を防止する。In the present invention, it is also possible to newly add an abnormal judgment criterion other than the above, if necessary. When the air fan 7, the water spray pump 10 or the gas booster fan 14 abnormally stops as described above, the stop signal immediately activates the diffusion valve 18 from the closed state to the open state to dissipate the combustible gas having a risk of explosion in the duct 23. Diffuses into the atmosphere. Then, the shutoff valve 17 is operated from open to closed to shut off the inflow of combustible gas into the wet dust remover 12. At the same time, the dilution valve 19 is operated from closed to open, and air is introduced from the dilution duct 24, thereby diluting the flammable gas accumulated in the wet dust remover 12 and thereafter to prevent its explosion.
【００１６】[0016]
【発明の効果】以上説明したように本発明によれば、装
炭車上に搭載した車上集塵装置に異常が発生したら、放
散弁を開放して可燃性ガスを大気中に放出すると共に、
遮断弁を閉止して可燃性ガスが湿式除塵器に流入するの
を遮断する。それと共に希釈弁を開いて空気を湿式除塵
器に導入して滞留している可燃性ガスを希釈するので、
車上集塵装置内で可燃性の集塵ガスが爆発するのを確実
に防止することができ、その効果は多大である。As described above, according to the present invention, when an abnormality occurs in the on-vehicle dust collector mounted on the coal-coated vehicle, the diffusion valve is opened to release the combustible gas into the atmosphere, and
The shutoff valve is closed to shut off the combustible gas from flowing into the wet dust remover. At the same time, open the dilution valve to introduce air into the wet dust remover to dilute the remaining flammable gas,
It is possible to reliably prevent the flammable dust collecting gas from exploding in the on-vehicle dust collecting device, and the effect is great.
【図１】本発明に係る装入車に搭載された車上集塵装置
を示す機略配置図である。FIG. 1 is a schematic layout diagram showing an on-vehicle dust collector mounted on a charging vehicle according to the present invention.
【図２】従来例に係る装入車に搭載された車上集塵装置
を示す機略配置図である。FIG. 2 is a schematic layout diagram showing an on-vehicle dust collector mounted on a charging vehicle according to a conventional example.
１ 炭化室 ２ 装入シュート ３ 集塵フード ４ 点火バーナ ５ 装炭ホッパ ６ 集塵ダクト ７ 空気ファン ８ LPG ボンベ ９ 散水タンク 10 散水ポンプ 11 散水ノズル 12 湿式除塵器 13 遠心分離器 14 ガス昇圧ファン 15 連結管 16 集合集塵ダクト 17 遮断弁 18 放散弁 19 希釈弁 20 装炭車 21 フィーダ 22 装入口 23 放散ダクト 24 希釈ダクト 25 車上集塵装置 1 Charging chamber 2 Charging chute 3 Dust collecting hood 4 Ignition burner 5 Charging hopper 6 Dust collecting duct 7 Air fan 8 LPG cylinder 9 Sprinkling tank 10 Sprinkling pump 11 Sprinkling nozzle 12 Wet dust remover 13 Centrifugal separator 14 Gas boosting fan 15 Connection pipe 16 Collecting dust collection duct 17 Shutoff valve 18 Dissipation valve 19 Dilution valve 20 Coal car 21 Feeder 22 Loading port 23 Dispersion duct 24 Dilution duct 25 Dust collection system on board
Claims (1)
するガスを捕集するため昇降可能に設けた集塵フードに
点火バーナを備え、前記集塵フードに連通する集塵ダク
トに湿式除塵器およびガス昇圧ファンを備えたコークス
炉装炭車の車上集塵装置において、前記湿式除塵器の入
側における集塵ダクトに遮断弁を配設すると共に、この
遮断弁の上流側における集塵ダクトから分岐された放散
ダクトに放散弁を配設する一方、前記湿式除塵器に大気
を導入する希釈ダクトに希釈弁を配設し、集塵ガスの異
常時に前記遮断弁を作動させると共に、放散弁および希
釈弁を開に作動して集塵ガスの爆発を未然に防止するよ
うに構成したことを特徴とするコークス炉装炭車の車上
集塵装置。1. A dust collecting hood that is vertically movable to collect gas ejected from a charging port during charging of a coke oven is equipped with an ignition burner, and a dust collecting duct communicating with the dust collecting hood is wetted. In an on-vehicle dust collector of a coke oven coal car equipped with a dust remover and a gas booster fan, a shutoff valve is provided in a dust collection duct on the inlet side of the wet dust remover, and dust is collected on the upstream side of the shutoff valve. A diffusion valve is installed in a diffusion duct branched from the duct, while a dilution valve is installed in a dilution duct that introduces the atmosphere into the wet dust remover, and the shutoff valve is activated when dust collecting gas is abnormal, and the diffusion is performed. An on-vehicle dust collector for a coke-fired coal-fired vehicle, characterized in that the valve and the dilution valve are opened to prevent explosion of dust-collecting gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21842494A JP3551486B2 (en) | 1994-09-13 | 1994-09-13 | On-board dust collector for coke oven charcoal truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21842494A JP3551486B2 (en) | 1994-09-13 | 1994-09-13 | On-board dust collector for coke oven charcoal truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0881682A true JPH0881682A (en) | 1996-03-26 |
| JP3551486B2 JP3551486B2 (en) | 2004-08-04 |
Family
ID=16719703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21842494A Expired - Fee Related JP3551486B2 (en) | 1994-09-13 | 1994-09-13 | On-board dust collector for coke oven charcoal truck |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3551486B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100760575B1 (en) * | 2001-09-27 | 2007-10-04 | 주식회사 포스코 | Flame outbreak prevention device for coke oven youtube |
| KR101028802B1 (en) * | 2008-08-04 | 2011-04-12 | 주식회사 포스코 | Coal Charging Device of Coke Oven |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101453655B1 (en) * | 2013-02-22 | 2014-10-22 | 주식회사 포스코 | Cokes oven |
-
1994
- 1994-09-13 JP JP21842494A patent/JP3551486B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100760575B1 (en) * | 2001-09-27 | 2007-10-04 | 주식회사 포스코 | Flame outbreak prevention device for coke oven youtube |
| KR101028802B1 (en) * | 2008-08-04 | 2011-04-12 | 주식회사 포스코 | Coal Charging Device of Coke Oven |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3551486B2 (en) | 2004-08-04 |
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