JP2002231493A5 - - Google Patents

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Publication number
JP2002231493A5
JP2002231493A5 JP2001030349A JP2001030349A JP2002231493A5 JP 2002231493 A5 JP2002231493 A5 JP 2002231493A5 JP 2001030349 A JP2001030349 A JP 2001030349A JP 2001030349 A JP2001030349 A JP 2001030349A JP 2002231493 A5 JP2002231493 A5 JP 2002231493A5
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JP
Japan
Prior art keywords
liquid
electrically insulating
explosion
container
floating
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
Application number
JP2001030349A
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Japanese (ja)
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JP2002231493A (en
JP3656109B2 (en
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Priority to JP2001030349A priority Critical patent/JP3656109B2/en
Priority claimed from JP2001030349A external-priority patent/JP3656109B2/en
Publication of JP2002231493A publication Critical patent/JP2002231493A/en
Publication of JP2002231493A5 publication Critical patent/JP2002231493A5/ja
Application granted granted Critical
Publication of JP3656109B2 publication Critical patent/JP3656109B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【0004】
また、図6に示すように、容器2aが地震等により振動する場合や容器が移動式の大型タンカーやタンクローリ車のような場合には移動中にタンク並びに、その中の油面が動揺する。これによっても流動帯電による液面電界が増大する。更にまた、これらの摩擦により、火花が生じ、油面に着火して爆発が起こり、災害となる。そこで、この爆発を防止するための従来技術の1例としては、アースに接続した剛式板状の電気導体を油面に設ける浮き屋根もしくは浮きぶた方式のものもあった。尤も、これらの浮きぶた等には、油類の蒸発を抑制する作用が主目的でその機能は電気的なものではない。
[0004]
Further, as shown in FIG. 6, the tank and the moving when the container 2a is as large tankers and tank lorry vehicle or when the container is movable to vibrate by an earthquake or the like, the oil level therein upset. These liquid surface electric field due to the flow charge is increased by. Furthermore, due to these frictions, sparks are generated, and the oil surface is ignited to cause an explosion, resulting in a disaster. Therefore, as an example of the prior art for preventing this explosion, there is also a floating roof or floating type in which a rigid plate-like electric conductor connected to the ground is provided on the oil surface. However, these floats and the like have the main purpose of suppressing the evaporation of oils, and their functions are not electrical.

【0006】
この防止方法としては、例えば、
(1)供給パイプ内液体の流速を制限し流動帯電電荷量を減らす。
(2)取り扱う液体の導電率を増やし帯電電荷の緩和時間を減らすため、高価な帯電防止剤を混合する。
(3)液面の検尺、サンプリング等の作業は、積荷終了後、長時間放置し電荷が減衰した後で行う。
(4)タンク内で放電が発生しても着火が起こらぬようにタンク内気相の酸素濃度を下げる対策をとる。このため気相を不活性ガスに置換する設備を設ける。
(5)油面に、剛式板状の電気導体の浮き屋根を設ける、等が挙げられる。
然し乍ら、(1)項の対策では液体の供給速度が遅く、タンク内の積込み作業効率が低下する。また、(2)の場合は帯電防止剤が多量に必要になり、コスト高になると共に液体の性質に悪影響を与える恐れがある。また(3)は迅速な作業ができない。また、(4)は特別の気体の置換設備が必要となり設備費が高価なものとなる。
更に、(5)の剛式の浮き屋根ないし浮きぶた方式では、地震等により浮き屋根等が傾くと油面との間に縦断面三角状の空間ができ、ここが高電界となり、放電着火の危険を生ずる。なおまた、油タンク及び該浮き屋根が変形することにより、浮きぶた等の端がタンク内面に当たり、衝撃や摩擦が起こり、熱を発生して発火災害に到るという問題点もある。
[0006]
As this prevention method, for example,
(1) Limit the flow velocity of the liquid in the supply pipe to reduce the amount of flowing charge.
(2) In order to increase the conductivity of the liquid to be handled and reduce the relaxation time of the charge, an expensive antistatic agent is mixed.
(3) The measurement of the liquid level, sampling, etc. are performed after leaving the load for a long time after the charge has been attenuated.
(4) Take measures to reduce the oxygen concentration in the gas phase in the tank so that ignition does not occur even if discharge occurs in the tank. For this purpose, equipment is provided to replace the gas phase with an inert gas.
(5) An oil surface may be provided with a floating roof of a rigid plate-like electric conductor.
However, in the measure of (1), the liquid supply rate is slow, and the loading operation efficiency in the tank decreases. In the case of (2), a large amount of antistatic agent is required, which increases the cost and may adversely affect the properties of the liquid. In addition (3) can not work quickly. In addition, (4) requires special gas substitution equipment, which makes the equipment cost expensive.
Furthermore, in the case of the floating roof or floating system of the rigid type (5), when the floating roof etc. is tilted due to an earthquake etc. , a space with a vertical cross section is formed between the oil surface and this. It creates a danger. Furthermore, the deformation of the oil tank and the floating roof causes the end of the float to hit the inner surface of the tank, causing impact and friction, generating heat and causing a fire hazard.

【0008】
【課題を解決するための手段】
本発明は、以上の目的を達成するために、第1の特徴として、該容器内の電気絶縁性可燃液体の放電着火爆発防止方法として、容器内に収納されている電気絶縁性可燃液体の表面に接地された導電性フロートとそれらをフレキシブルな導電性ロープによって、粗ないしは細の格子状ないし網目に連結して浮遊させ前記電気絶縁性可燃液体の液面蓄積電荷並びに液面上部気相電界を零に近づけることにより、前記電気絶縁性可燃液体の放電着火爆発を防止することである。
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has, as a first feature, the surface of the electrically insulating combustible liquid contained in the container as a method for preventing discharge ignition and explosion of the electrically insulating combustible liquid in the container. Floating floats by connecting them to a coarse or fine grid or network by means of flexible conductive ropes grounded to the ground, and floating charges of the electrically insulating combustible liquid as well as upper surface gas phase electric field By approaching to zero, it is to prevent the discharge ignition explosion of the electrically insulating combustible liquid.

【0015】
かつ、望ましくは容器内の電気絶縁性可燃液体の放電着火爆発防止装置は、前記可撓性の、ないしはフレキシブルな導電性フロートが適宜メッシュを有する粗ないしは細の網体もしくは格子体からなることを含むものとする。これにより、安価で取り扱い性のよい導電性フロートを得ることができる。
[0015]
And preferably, the apparatus for preventing discharge ignition and explosion of the electrically insulating combustible liquid in the container, said flexible or flexible conductive float is made of a coarse or fine mesh or grid body having a mesh as appropriate. Shall be included. This makes it possible to obtain a conductive float that is inexpensive and easy to handle.

【0019】
本発明の容器内の電気絶縁性可燃液体4の放電着火爆発防止装置は以下にその詳細構造の例を示す導電性フロート1を用いたものからなり、前記導電性フロート1は粗ないし細の格子状ないし網目状のものからなり電気絶縁性可燃液体4の液表面8の上面の形状に常に沿って、浮遊状態でフレキシブルに配置される。また、この導電性フロート1は地面7側にアースされる。
[0019]
The apparatus for preventing discharge ignition and explosion of the electrically insulating combustible liquid 4 in the container according to the present invention comprises an electrically conductive float 1 shown below as an example of its detailed structure, said electrically conductive float 1 having a coarse to fine lattice It has a shape like a mesh or a mesh and is flexibly arranged in a floating state along the shape of the upper surface of the liquid surface 8 of the electrically insulating combustible liquid 4. Also, the conductive float 1 is grounded to the ground 7 side.

【0025】
本発明の容器内の電気絶縁性可燃液体の放電着火爆発防止方法並びに装置によれば、容器内に発生する蓄積電荷を、液上面の形状に常に沿うフレキシブル導電フロロートにより、常時除電し、放電着火爆発防止を行うことができると共に電気絶縁性可燃液体の荷役作業のスピードを早くでき、作業効率を向上することができ更に検尺やサンプリング作業も任意の時期に可能とし、かつ比較的安価に実施できるという効果をあげることができる。更にまた、本発明の導電性フロートは、粗ないし細目の格子状ないし網目状のもので、フレキシブルであって、地震等による油面の波の形状の変化に常に沿える形状のものであるから、大地震の場合も発生した電荷を常にアースに安全に導くことができるので、静電気は発生せず、静電気放電着火、災害のおそれは全くないという絶大な効果を有するものである。
[0025]
According to the method and device for preventing discharge ignition and explosion of the electrically insulating combustible liquid in the container of the present invention, the accumulated charge generated in the container is constantly removed by the flexible conductive fluorocarbon which always conforms to the shape of the liquid top surface, and discharge ignition Explosion prevention can be performed, the loading speed of electrically insulating combustible liquid can be increased, work efficiency can be improved, and measurement and sampling can be performed at any time, and implemented relatively inexpensively. You can get the effect that you can. Furthermore, since the conductive float of the present invention is a coarse to fine grid-like or mesh-like one, it is flexible and has a shape that always follows the change in the wave shape of the oil surface due to an earthquake or the like. Since the generated charges can always be safely led to the ground even in the case of a large earthquake, static electricity is not generated, and there is a great effect that there is no risk of electrostatic discharge ignition or disaster.

JP2001030349A 2001-02-07 2001-02-07 Method and apparatus for preventing discharge ignition and explosion of electrically insulating combustible liquid in container Expired - Fee Related JP3656109B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001030349A JP3656109B2 (en) 2001-02-07 2001-02-07 Method and apparatus for preventing discharge ignition and explosion of electrically insulating combustible liquid in container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001030349A JP3656109B2 (en) 2001-02-07 2001-02-07 Method and apparatus for preventing discharge ignition and explosion of electrically insulating combustible liquid in container

Publications (3)

Publication Number Publication Date
JP2002231493A JP2002231493A (en) 2002-08-16
JP2002231493A5 true JP2002231493A5 (en) 2004-12-16
JP3656109B2 JP3656109B2 (en) 2005-06-08

Family

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Family Applications (1)

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Country Status (1)

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JP (1) JP3656109B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100415066C (en) * 2005-11-11 2008-08-27 中国石油化工股份有限公司 Lightning protection anti electrostatic grounding device for crude oil floating top pot floating dish
CN102991895B (en) * 2012-10-30 2017-05-24 河北珠峰仪器仪表设备有限公司 Retractable hatch container and floating element equipotential connection system
CN102946682B (en) * 2012-10-30 2017-05-24 河北珠峰仪器仪表设备有限公司 Static electricity eliminating method for floating element of telescopic hatch container
CN104875985B (en) * 2015-04-13 2017-08-25 江苏飞锦达科技有限公司 A kind of Equipotential connection device and floating roof tank

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