JPH07125795A - Gas replacement device - Google Patents
Gas replacement deviceInfo
- Publication number
- JPH07125795A JPH07125795A JP5263516A JP26351693A JPH07125795A JP H07125795 A JPH07125795 A JP H07125795A JP 5263516 A JP5263516 A JP 5263516A JP 26351693 A JP26351693 A JP 26351693A JP H07125795 A JPH07125795 A JP H07125795A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- tank
- supply
- exhaust port
- exhaust
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】例えばＬＰＧ、アンモニア、メタ
ン、アセチレンなどの可燃性ガスや液化ガスが貯蔵され
ているタンクなどを定期的に検査・補修した後、再スタ
ートアップさせるに際し、タンク内の空気を窒素ガスな
どのイナートガスで効率良く置換する装置に関する。[Industrial application] For example, after periodically inspecting and repairing a tank that stores liquefied gas or flammable gas such as LPG, ammonia, methane, and acetylene, when re-starting up the air in the tank, The present invention relates to a device that efficiently replaces an inert gas such as nitrogen gas.
【０００２】[0002]
【従来の技術】可燃性ガスや液化ガスなどあるいは特定
の化学物質に所定量の空気や酸素などが混入すると爆発
を起こしたり悪戯な化学反応が進行するので、それを防
止するために不活性ガスを添加することによって混合気
体・液体中の酸素濃度を燃焼・爆発あるいは化学変化が
進行・継続するに必要な酸素濃度以下に低下させる必要
がある。とりわけＬＰＧ、アンモニア、メタン、アセチ
レンなどの可燃性ガスや液化ガスの爆発限界酸素濃度は
既に知られているので、これらの可燃性ガスや液化ガス
が貯蔵されているタンクなどを法規により定期的に開放
検査を行う場合、細心の注意を払ってまずタンク内のガ
ス（以下タンク内残存ガスと略称する）を完全に排出し
た後空気と置換せしめ、開放検査が終了したら今度はタ
ンク内の空気を完全に排出してタンク内に可燃性ガスな
どを導入する。そしてこのようなタンク内残存ガスの置
換に使われる不活性ガスとして窒素ガス、アルゴゴン、
炭酸ガスなどがあるが、通常は主として窒素ガスが使わ
れている。しかしながら、窒素ガスは空気やタンク内残
存ガスとの比重差が小さいので、窒素ガスで大型のタン
ク内を置換するとなると、窒素ガスのみが先に排気され
てしまって、タンク内が窒素ガスで完全に置換されるま
でにはかなりの時間を必要とし、またタンクの隅部など
に空気やタンク内残存ガスが滞留するようなケースが生
じて必要以上の窒素ガスを注入しなければならないとい
った問題が生じる。したがって窒素ガスと空気やタンク
内残存ガスとを極力混合させないようにして空気やタン
ク内残存ガスを排気口から効率よく排気させるようなガ
ス置換方法が以前から検討されてきた。例えば特開昭５
７−１０４５８２号公報には、上下に長い筒状のタンク
の最上端と最下端に給、排口を開口し、該開口部に邪魔
板を付設した熱媒体の置換タンクが提案されている。ま
た、特開昭６２−２３９０８９号公報にはチェンバ側壁
に軸線が中心よりずれたガスの吹出口と排気口を設け、
該吹出口にのみ邪魔板を設置した窒素置換装置の技術が
記載されている。一方、特開平４−１６５２９４号公報
には、チャンバー内に供給する不活性ガスであるアルゴ
ンと空気との比重差を利用した雰囲気ガスの置換方法が
提案されている。2. Description of the Related Art If a certain amount of air or oxygen is mixed with flammable gas or liquefied gas or a specific chemical substance, an explosion or a mischievous chemical reaction will proceed. It is necessary to reduce the oxygen concentration in the mixed gas / liquid to below the oxygen concentration required for combustion / explosion or chemical change to proceed / continue. Especially, since the explosive limit oxygen concentration of flammable gas such as LPG, ammonia, methane, and acetylene is already known, the tanks where these flammable gas and liquefied gas are stored are regularly required by law. When performing an open inspection, pay close attention to the gas in the tank (hereinafter, abbreviated as residual gas in the tank) and completely replace it with air. After the open inspection, remove the air in the tank. Completely discharge and introduce flammable gas into the tank. And as such an inert gas used to replace the residual gas in the tank, nitrogen gas, Argogon,
There are carbon dioxide, etc., but usually nitrogen gas is mainly used. However, nitrogen gas has a small difference in specific gravity between air and the residual gas in the tank, so when replacing the inside of a large tank with nitrogen gas, only the nitrogen gas is exhausted first, and the inside of the tank is completely filled with nitrogen gas. It takes a considerable amount of time to be replaced with, and there is a problem that air and residual gas in the tank may accumulate in the corners of the tank and more nitrogen gas must be injected than necessary. Occurs. Therefore, a gas replacement method for efficiently exhausting the air or the residual gas in the tank from the exhaust port by preventing the nitrogen gas from mixing with the air or the residual gas in the tank has been studied. For example, JP-A-5
Japanese Patent Laid-Open No. 7-104582 proposes a heat medium replacement tank in which a cylindrical tank that is long in the up and down direction is provided with an inlet and outlet at the upper and lower ends and a baffle plate is attached to the opening. Further, in JP-A-62-239089, there are provided a gas outlet and an exhaust outlet on the side wall of the chamber, the axis of which is offset from the center.
The technology of a nitrogen replacement device in which a baffle plate is installed only at the air outlet is described. On the other hand, Japanese Unexamined Patent Publication No. 4-165294 proposes a method of replacing an atmospheric gas by utilizing a difference in specific gravity between argon, which is an inert gas supplied into the chamber, and air.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記した
従来技術はその目的、利用分野が異なるので、ＬＰＧ、
アンモニア、メタン、アセチレンなどの可燃性ガスや液
化ガスなどが貯蔵されている大型タンク内のガス置換に
は安全性あるいは置換効率の面から採用することは難し
い。本発明は以上のような従来技術の問題点を解消して
可燃性ガスや液化ガスなどが貯蔵されているタンク内の
ガス置換を安全に行うことのできる置換効率のよいガス
置換装置をうることを目的とするものである。However, since the above-mentioned prior arts have different purposes and fields of use, the LPG,
From the viewpoint of safety or replacement efficiency, it is difficult to replace gas in a large tank that stores flammable gas such as ammonia, methane, and acetylene, or liquefied gas. The present invention solves the problems of the prior art as described above and provides a gas replacement device with good replacement efficiency that can safely perform gas replacement in a tank that stores flammable gas, liquefied gas, or the like. The purpose is.
【０００４】[0004]
【課題を解決するための手段】本発明は以上のような目
的を達成するために次のようなガス置換装置を提供する
ものである。すなわち横型タンクの頂部と底部の所定の
複数個所に給、排気管に接続する給排気口を穿設し、該
給、排気口の内径より若干大きい分散板を該給排気口に
対向する位置においてタンク内壁から所定の距離をおい
てサポートでタンク本体に支持し、上記給、排気口より
所定の不活性ガスをタンク内に給、排気してタンク内残
存ガスをガス置換することを特徴とするガス置換装置で
ある。SUMMARY OF THE INVENTION The present invention provides the following gas replacement device to achieve the above object. That is, the top and bottom of the horizontal tank are provided with a plurality of supply / exhaust ports connected to the supply / exhaust pipes at predetermined locations, and a dispersion plate slightly larger than the inner diameter of the supply / exhaust ports is provided at a position facing the supply / exhaust port. Characterized by supporting the tank main body with a support at a predetermined distance from the inner wall of the tank, supplying a predetermined inert gas into the tank through the supply / exhaust port and exhausting the gas to replace the residual gas in the tank. It is a gas replacement device.
【０００５】[0005]
【作用】本発明に係わるタンク内のガス置換装置は、Ｌ
ＰＧ、アンモニア、メタン、アセチレンなどの可燃性ガ
スや液化ガスが貯蔵された横型の大型タンクの頂部と底
部にガス給、排気管に接続する複数のガス給、排気口を
所定の位置にそれぞれ穿設し、それぞれの給、排気口に
は該給、排気口の内径より大きい分散板が給、排気口か
ら所定の距離を隔てて該給、排気口に対向するように固
設されているので、例えば、不活性ガスである窒素ガス
を給、排気口からアンモニアが残存するタンク内に給気
すると、窒素ガスは分散板に衝突して水平方向に均一に
分散してタンク内残存ガスと混合することなく、層状に
分離されて窒素ガスとアンモニアガスとの二層に分離さ
れ、上層のタンク内に残存するアンモニアガスは下層の
窒素ガスに押し上げられて層状態を保持しながら上昇移
動していく。一方、タンク頂部にも同様な給、排気口と
分散板が穿設・付設しているので、層状になって一様に
押し上げられた上層のタンク内残存ガスは、層状を維持
しながらタンクの頂部内壁に沿って水平移動して分散板
の周囲から給、排気口に吸い込まれ排気されていくの
で、タンク内に残存するアンモニアガスは短時間で効率
よく窒素ガスで完全に置換することができる。The gas replacement device in the tank according to the present invention is L
Gas supply to the top and bottom of a large horizontal tank that stores flammable gases such as PG, ammonia, methane, and acetylene, and liquefied gas, multiple gas supplies connected to an exhaust pipe, and an exhaust port at each prescribed position. Since a dispersion plate larger than the inner diameter of the supply / exhaust port is provided at each of the supply / exhaust ports, and is fixed so as to face the supply / exhaust port at a predetermined distance from the exhaust port. For example, when nitrogen gas that is an inert gas is supplied and the gas is supplied from the exhaust port into the tank where ammonia remains, the nitrogen gas collides with the dispersion plate and is uniformly dispersed in the horizontal direction and mixed with the residual gas in the tank. Without being separated, it is separated into two layers of nitrogen gas and ammonia gas, and the ammonia gas remaining in the upper tank is pushed up by the lower nitrogen gas and moves upward while maintaining the layer state. Go. On the other hand, since the same air supply / exhaust port and dispersion plate are also drilled / attached to the top of the tank, the residual gas in the upper tank, which has been layered and pushed up evenly, maintains the layered state of the tank. The ammonia gas remaining in the tank can be completely replaced with nitrogen gas in a short time because it moves horizontally along the inner wall of the top part, is supplied from around the dispersion plate, is sucked into the exhaust port, and is exhausted. .
【０００６】[0006]
【実施例】本発明の実施例を図面に基づいて説明する。
図１は容量が２０００ｍ3 の円筒型の横型アンモニアタ
ンクであって、２、３は該タンク１の頂部、底部の所定
の位置に穿設して給、排気管４・５に連通する複数のガ
ス給、排気口である。給、排気口２・３はそれぞれ同一
軸線上に相対面して位置している。６は略円板状の分散
板で、該分散板６は給、排気口２・３に対向するように
給、排気口から所定の距離を隔てて複数のサポート７で
支持されてタンク内壁にそれぞれ垂設し、立設してい
る。図２は給、排気管４・５、分散板６、サポート７の
位置関係を示すものであって、給、排気管４・５の頭部
はタンク内壁に開口している。そして給、排気口２・３
はそれぞれ同一軸線上に穿設し、該給、排気口２・３の
内径よりやや大きい略円板状の分散板６が給、排気口２
・３の真上にしかもタンク壁と平行に給、排気口２・３
に対向するようにして所定の高さの位置に３本のサポー
ト７で支持されている。分散板６、サポート７はタンク
内壁と同一の材質で製作され、それぞれ溶接して固定さ
れている。８・９は給、排気管４・５と給、排気口２・
３を接続するバルブであり、１０はガスの給、排気流量
を調節するためのオリフィスである。Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a cylindrical horizontal ammonia tank having a capacity of 2000 m 3 , and a plurality of tanks 2 and 3 are provided at predetermined positions on the top and bottom of the tank 1 to supply and communicate with exhaust pipes 4 and 5. Gas supply and exhaust port. The supply and exhaust ports 2 and 3 are located on the same axis and face each other. Reference numeral 6 denotes a substantially disc-shaped dispersion plate, which is supplied so as to face the supply / exhaust ports 2 and 3 and is supported by a plurality of supports 7 at a predetermined distance from the exhaust port and is supported on the inner wall of the tank. They are erected vertically. FIG. 2 shows the positional relationship between the supply / exhaust pipes 4, 5, the dispersion plate 6, and the support 7. The heads of the supply / exhaust pipes 4, 5 are open to the inner wall of the tank. And supply, exhaust port 2.3
Are respectively provided on the same axis, and a substantially disk-shaped dispersion plate 6 slightly larger than the inner diameter of the supply / exhaust ports 2 and 3 is supplied / exhausted.
・ Supply just above 3 and parallel to the tank wall, exhaust port 2.3
Are supported by three supports 7 at a predetermined height position so as to face each other. The dispersion plate 6 and the support 7 are made of the same material as the inner wall of the tank, and are fixed by welding. 8 and 9 are supply, exhaust pipes 4 and 5 are supply, exhaust port 2 and
A valve connecting 3 is provided, and 10 is an orifice for adjusting gas supply and exhaust flow rates.
【０００７】分散板６と給、排気口２・３は以上のよう
なタンク内壁に穿設し、付設しているので、アンモニア
タンクの法的な開放検査をする際のガス置換方法につい
て以下に説明する。まず複数のバルブ８を閉、バルブ９
を開にしてタンク内に貯蔵されているアンモニアを複数
の給、排気管４から系外に設置されている別のタンクに
抜き取る。その後、複数のバルブ８を開にして給、排気
管５を経て複数の給、排気口３から窒素ガスを給気する
が、このとき複数のオリフィス１０を作動して窒素ガス
は各給、排気口３から同一流量で給気される。窒素ガス
は図３に示すように分散板６に衝突して水平方向に均一
に分散し、タンク内アンモニアガスと混合せずにアンモ
ニアガスと窒素ガスとは二層に分離され、上層のアンモ
ニアガスは下層の窒素ガスに押し上げられて層状態を維
持しながら一様に上昇移動していく。一方、給、排気口
３の真上には給、排気口２が穿設されており、給、排気
口２にも分散板６が付設されているので、層状態を維持
しながら一様に上昇移動してきた上層のアンモニアガス
は、タンク頂部内壁に沿って水平移動して分散板６の周
囲から層流状態で給、排気口２に吸い取られて排気され
ていく。そして所定量の窒素ガスを給気してタンク内は
完全に窒素ガスで置換される。抜き取られたアンモニア
ガスには窒素ガスが含まれているので、前記した系外の
タンクとは別のタンクに送られる。ガス置換が完了した
ことを検知・確認した後、今度は給、排気管５を経て空
気をタンク内に給気するが、複数の給、排気口３から給
気された空気は分散板６に衝突して水平方向に均一に分
散し、空気は窒素ガスと混合することなく二層に分散さ
れる。そして、空気を各給、排気口３から同一流量で給
気して上層の窒素ガスを層状態を保ちながら一様に押し
上げていく。層状態で上昇移動した窒素ガスはタンク頂
部内壁に沿って水平移動して分散板６に案内されて給排
気口２に吸い込まれて排気されていくものである。そし
て窒素ガスと空気の混合ガスは大気に放出される。タン
ク内が完全に空気で置換されたことが検知・確認される
と、バルブ８・９を閉止してタンクの開放検査作業に入
る。開放検査の作業が終了すると、上記と同一の方法で
まずバルブ８・９を開にして給、排気管４、給、排気口
２を経て窒素ガスをタンク内に給気してタンク内から空
気を排気し、完全に空気が窒素ガスで置換されたことを
検知・確認した後、給、排気管４、給、排気口２を経て
アンモニアガスをタンク内に給気する。そして、タンク
内の窒素ガスがアンモニアガスで完全に置換されたこと
を確認した後、バルブ８・９を閉止する。Since the dispersion plate 6 and the supply / exhaust ports 2 and 3 are bored and attached to the inner wall of the tank as described above, the gas replacement method for the legal opening inspection of the ammonia tank will be described below. explain. First, close the valves 8 and 9
Is opened and the ammonia stored in the tank is extracted from a plurality of supply / exhaust pipes 4 into another tank installed outside the system. After that, a plurality of valves 8 are opened to supply, a plurality of supplies via the exhaust pipe 5, and a nitrogen gas is supplied from the exhaust port 3. At this time, a plurality of orifices 10 are operated to supply and exhaust the nitrogen gas. Air is supplied from the mouth 3 at the same flow rate. As shown in FIG. 3, the nitrogen gas collides with the dispersion plate 6 and is uniformly dispersed in the horizontal direction. The ammonia gas and the nitrogen gas are separated into two layers without mixing with the ammonia gas in the tank, and the ammonia gas in the upper layer is separated. Is pushed up by the nitrogen gas in the lower layer and uniformly moves upward while maintaining the layer state. On the other hand, since the supply / exhaust port 2 is formed right above the supply / exhaust port 3, and the dispersion plate 6 is also attached to the supply / exhaust port 2, it is possible to uniformly maintain the layered state. The upper layer ammonia gas that has moved upward is horizontally moved along the inner wall of the tank top, is supplied from the periphery of the dispersion plate 6 in a laminar flow state, is sucked by the exhaust port 2, and is exhausted. Then, a predetermined amount of nitrogen gas is supplied to completely replace the inside of the tank with nitrogen gas. Since the extracted ammonia gas contains nitrogen gas, it is sent to a tank different from the tank outside the system described above. After detecting and confirming that the gas replacement is completed, this time, air is supplied to the tank through the supply / exhaust pipe 5, but the air supplied from a plurality of supply / exhaust ports 3 is distributed to the dispersion plate 6. After collision, the air is uniformly dispersed in the horizontal direction, and the air is dispersed in two layers without being mixed with nitrogen gas. Then, air is supplied at the same flow rate from each supply and exhaust port 3, and the upper layer nitrogen gas is uniformly pushed up while maintaining the layered state. The nitrogen gas ascendingly moved in a layered state moves horizontally along the inner wall of the tank top, is guided by the dispersion plate 6 and is sucked into the air supply / exhaust port 2 and exhausted. Then, the mixed gas of nitrogen gas and air is released to the atmosphere. When it is detected and confirmed that the inside of the tank is completely replaced with air, the valves 8 and 9 are closed and the opening inspection work of the tank is started. When the open inspection work is completed, first open the valves 8 and 9 by the same method as above, and supply nitrogen gas into the tank through the exhaust pipe 4, the supply and the exhaust port 2 to supply air from the inside of the tank. After detecting and confirming that the air has been completely replaced with nitrogen gas, ammonia gas is supplied into the tank through the supply, the exhaust pipe 4, the supply and the exhaust port 2. Then, after confirming that the nitrogen gas in the tank has been completely replaced by the ammonia gas, the valves 8 and 9 are closed.
【０００８】次に上記したガス置換方法で横が３０ｍ、
外径が１０ｍ、容量が２０００ｍ3の円筒型・横型のア
ンモニアタンクに下記の置換装置を付設してタンク内の
空気を窒素ガスで置換した。 １ タンク頂部に４ヵ所、タンク底部に４ヵ所それぞれ
同一間隔で、内径８０ミリの給、排気口を穿設した。上
下の給、排気口は同一軸線上に位置している。 ２ 分散板は内径２００ミリの円板状で、給、排気口か
ら１００ミリの高さに３本のサポートで支持されてい
る。 ３ 窒素ガスの流入速度は約１０ｍ／Ｓとした。その結
果、完全に置換が完了したことを検知し、確認する時間
も含めて約６時間でガス置換は完了した。従来方法では
窒素ガス置換に約２４時間かかっていたので、窒素ガス
置換所要時間は従来比１／４に短縮された。また、バル
ブの開閉、アンモニア・窒素ガス・空気の給気・排気、
各計測器などはすべて中央制御室のコンピュータに接続
し、各種のガスの給気・排気はすべて自動化されている
ので、生産性・作業性の向上に大いに寄与した。上記し
たように、給気ガスが分散板に衝突して効果的に水平方
向へ分散、拡散し、給気ガスはタンク内ガスと混合する
ことなくそれぞれ分離して二層を形成しタンク内ガスが
層状を維持しながら上昇あるいは下降移動していくため
には、タンクの大きさ・容量と付設する給、排気口・分
散板の数ならびに給、排気口の内径・分散板の外径・分
散板の高さ、ならびに置換ガスの種類とその流入速度が
関係してくる。安全性とガス置換効率ならびに分散板を
付設するコストの両面を考慮して、コンピュータで計算
し、確認した結果、５００ｍ3 以上１０００ｍ3 以下の
横型で円筒型タンクではタンクの頂部と底部に３ヵ所そ
れぞれ給、排気口・分散板を付設するのが好ましく、１
０００ｍ3 以上のタンクならば頂部と底部のそれぞれに
少なくとも４ヵ所給、排気口・分散板を穿設し、付設す
るのが好ましい。また、実施例では給、排気口はタンク
の頂部と底部にそれぞれ同一軸線上に穿設している。こ
れはガスが均一に分散して層状を維持しながら上昇下降
移動して排気するのに効果があるからで別に給、排気口
が同一軸線上に穿設していなくても構わない。またタン
ク容量が１０００ｍ3 以上の給、排気口の内径・分散板
の高さについては、分散板の外径は給、排気口の内径の
１．５倍程度、分散板の高さは給排気口の内径の１．５
倍程度、給、排気口の内径は３０〜１１０ミリ程度が好
ましく、その時の置換ガス流速は３〜２５ｍ／Ｓ程度が
好ましい。Next, by the gas replacement method described above, the width is 30 m,
A cylindrical / horizontal type ammonia tank having an outer diameter of 10 m and a capacity of 2000 m 3 was attached with the following replacement device to replace the air in the tank with nitrogen gas. 1 Four holes were provided at the top of the tank and four holes were provided at the bottom of the tank at the same intervals. The upper and lower air supply and exhaust ports are located on the same axis. 2 The dispersion plate is in the shape of a disc having an inner diameter of 200 mm and is supported by three supports at a height of 100 mm from the air supply / exhaust ports. 3 The inflow velocity of nitrogen gas was set to about 10 m / S. As a result, it was detected that the replacement was completely completed, and the gas replacement was completed in about 6 hours including the confirmation time. In the conventional method, it took about 24 hours to replace the nitrogen gas, so the time required to replace the nitrogen gas was shortened to 1/4 that of the conventional method. Also, open and close valves, supply / exhaust ammonia / nitrogen gas / air,
All measuring instruments were connected to a computer in the central control room, and the supply and exhaust of various gases were all automated, which greatly contributed to the improvement of productivity and workability. As described above, the supply gas collides with the dispersion plate and is effectively dispersed and diffused in the horizontal direction.The supply gas is separated into two layers without mixing with the gas in the tank to form the gas in the tank. In order to move upwards or downwards while maintaining a layered structure, the size and capacity of the tank and the number of auxiliary feeds, the number of exhaust ports and dispersion plates, and the supply, the inner diameter of the exhaust port, the outer diameter of the dispersion plate, and the dispersion The height of the plate, the type of the replacement gas and the inflow rate of the replacement gas are related. In consideration of both safety and gas replacement efficiency and the cost of installing a dispersion plate, the result was calculated and checked by a computer, and as a result, in a horizontal cylindrical tank of 500 m 3 or more and 1000 m 3 or less, there are 3 locations on the top and bottom of the tank. It is preferable to attach a supply / exhaust port / dispersion plate respectively.
In the case of a tank of 000 m 3 or more, it is preferable that at least four places are provided at each of the top and bottom, and an exhaust port / dispersion plate is provided and attached. Further, in the embodiment, the supply and exhaust ports are provided on the top and bottom of the tank on the same axis. Since this is effective in that the gas is uniformly dispersed and moves upward and downward while maintaining a layered state and is exhausted, it is not necessary to separately provide the supply port and the exhaust port on the same axis. Regarding the supply of tank capacity of 1000 m 3 or more, the inner diameter of the exhaust port and the height of the dispersion plate are the outer diameter of the dispersion plate, about 1.5 times the inner diameter of the exhaust port, and the height of the dispersion plate is the supply and exhaust. Mouth inner diameter 1.5
It is preferable that the inner diameter of the supply / exhaust port is about 30 to 110 mm, and the replacement gas flow rate at that time is about 3 to 25 m / S.
【０００９】実施例では分散板の形状は略円板状と説明
したが、その形状は別に限定するものではなく、また横
型の円筒型アンモニアタンクのガス置換について説明し
たが当然ながらアンモニア以外の可燃性ガスや液化ガス
が貯蔵された大型タンク内のガス置換にも本発明になる
ガス置換装置を採用すると著しい効果が期待される。ま
たガスの給、排気は、タンク頂部の給、排気口からか、
あるいはタンク底部の給、排気口からかは当然ながらタ
ンク内に残存するガスと置換ガスの種類によって決めら
れるものである。小形タンク、あるいは縦型タンク内の
ガス置換にも本ガス置換装置を採用することはできる
が、小形タンク・縦型タンクには置換装置を付設するの
が難しく、また付設できたとしても複数基は付設できな
いし、その上ガス置換に要する時間は著しくは短縮され
ないので、それほど大きな効果は期待できない。何れに
しても本案は、大型タンク内壁の頂部、底部に開口する
複数の給、排気口にそれぞれ分散板を付設し、例えば窒
素ガスと空気やタンク内残存ガスとを混合させずにそれ
ぞれ分離して二層状態にし、二層状態を維持しながら上
層のガスを下降移動せしめたり、あるいは下層のガスを
上昇移動せしめて短時間で効率よく、また安全にタンク
内のガスを置換する装置を提供することを特徴とするも
のである。In the embodiment, the shape of the dispersion plate is described as a substantially disk shape, but the shape is not limited to this, and the gas replacement in the horizontal cylindrical ammonia tank has been described. Of course, flammable materials other than ammonia are combustible. When a gas replacement device according to the present invention is used for gas replacement in a large tank that stores a volatile gas or a liquefied gas, a remarkable effect is expected. Also, for gas supply and exhaust, from the supply at the top of the tank, the exhaust port,
Alternatively, it is of course determined from the supply and exhaust ports at the bottom of the tank depending on the types of gas and replacement gas remaining in the tank. This gas replacement device can be used for gas replacement in small tanks or vertical tanks, but it is difficult to install replacement devices for small tanks / vertical tanks, and even if they are installed, multiple units can be installed. Can not be attached, and the time required for gas replacement is not significantly shortened, so a great effect cannot be expected. In any case, the plan is to attach a dispersion plate to each of a plurality of supply and exhaust ports that open at the top and bottom of the inner wall of a large tank, and separate, for example, nitrogen gas and air or residual gas in the tank without mixing them. A device that replaces the gas in the tank safely in a short time by moving the gas in the upper layer downward while maintaining the two-layer state or moving the gas in the lower layer upward while maintaining the two-layer state It is characterized by doing.
【００１０】[0010]
【発明の効果】本発明に係わるタンク内のガス置換装置
は、横型タンクの頂部と底部の所定の複数カ所にそれぞ
れガス給、排気管に接続する給、排気口を穿設し、該
給、排気口に対向するように給、排気口より所定の高さ
に給、排気口の内径より若干大きい分散板をサポートで
それぞれ支持し、例えば、給、排気口より窒素ガスなど
の置換ガスをタンク内に給気すると、置換ガスは分散板
に衝突して水平方向へ均一に分散してタンク内に残存す
るアンモニアガスとは混合することなく置換ガスとタン
ク内残存ガスは分離して二層を形成し、タンク内アンモ
ニアガスは下層の置換ガスに押し上げられて層状態を維
持しながら上昇移動していく。一方、上記給、排気口に
対応して給、排気口がタンクの頂部にそれぞれ複数基付
設し、該給、排気口にも同一構造の分散板６が付設して
いるので、層状態を維持しながら上昇移動したタンク内
アンモニアガスは、タンク頂部内壁に沿って水平移動し
て分散板の周囲から給、排気口に吸い込まれて排気され
ていくので、従来方法に比して置換にかかる時間は大幅
に短縮され、また複数の分散板は簡単な加工でタンク内
壁に付設することができるので、本発明になるガス置換
装置を可燃性ガスや液化ガスが貯蔵されている地上タン
クは勿論、タンカーなどの輸送船に設置されているタン
クなどのガス置換に採用することにより安全性は確保さ
れ、置換効率は著しく向上し、タンク容量が大きい程著
しい効果が期待されるものである。The gas replacement device for a tank according to the present invention is provided with a gas supply port, a gas supply port connected to an exhaust pipe, and an exhaust port, which are provided at predetermined positions on the top and bottom of a horizontal tank. Supply so as to face the exhaust port, supply at a predetermined height from the exhaust port, and support dispersion plates slightly larger than the inner diameter of the exhaust port with supports, for example, a replacement gas such as nitrogen gas from the supply port and the exhaust port in a tank. When the gas is supplied into the tank, the replacement gas collides with the dispersion plate and is uniformly dispersed in the horizontal direction, and the replacement gas and the residual gas in the tank are separated without mixing with the ammonia gas remaining in the tank to form two layers. After being formed, the ammonia gas in the tank is pushed up by the replacement gas in the lower layer and moves upward while maintaining the layer state. On the other hand, a plurality of supply / exhaust ports are provided at the top of the tank corresponding to the supply / exhaust ports, and the dispersion plate 6 having the same structure is also attached to the supply / exhaust ports, so that the layer state is maintained. However, the ammonia gas in the tank that has moved upward moves horizontally along the inner wall of the tank top, is supplied from around the dispersion plate, and is sucked into the exhaust port and exhausted. Is greatly shortened, and since a plurality of dispersion plates can be attached to the inner wall of the tank by simple processing, the gas replacement device according to the present invention is not limited to the above-ground tank in which flammable gas or liquefied gas is stored, By adopting gas replacement for tanks installed in tankers and other transportation vessels, safety is ensured, replacement efficiency is significantly improved, and significant effects are expected as the tank capacity increases.
【図１】本発明にかかる円筒型の横型アンモニアタンク
の説明図FIG. 1 is an explanatory view of a cylindrical horizontal ammonia tank according to the present invention.
【図２】本発明にかかる分散板の構造を示す説明図FIG. 2 is an explanatory view showing a structure of a dispersion plate according to the present invention.
【図３】ガス置換の作動状態を示す説明図FIG. 3 is an explanatory diagram showing an operating state of gas replacement.
１ タンク ２ 給、排気口 ３ 給、排気口 ４ 給、排気管 ５ 給、排気管 ６ 分散板 ７ サポート ８ バルブ ９ バルブ 10 オリフィス 1 tank 2 supply, exhaust port 3 supply, exhaust port 4 supply, exhaust pipe 5 supply, exhaust pipe 6 dispersion plate 7 support 8 valve 9 valve 10 orifice
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中川 一幸 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 (72)発明者 長浜 光泰 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Nakagawa 5-3-8 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Mitsuyasu Nagahama 5 Nishikujo, Nishinoko-ku, Osaka City, Osaka Prefecture 3-28, Hitachi Shipbuilding Co., Ltd.
Claims (1)
所に給、排気管に接続する給、排気口を穿設し、該給、
排気口の内径より若干大きい分散板を該給、排気口に対
向する位置においてタンク内壁から所定の距離をおいて
サポートでタンク本体に支持したことを特徴とするガス
置換装置。1. A horizontal tank having a top portion and a bottom portion provided at a plurality of predetermined positions, a supply port connected to an exhaust pipe, and an exhaust port provided therein.
A gas replacement device, characterized in that a dispersion plate slightly larger than the inner diameter of the exhaust port is supported on the tank main body by a support at a position facing the supply and exhaust port at a predetermined distance from the inner wall of the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5263516A JP2540442B2 (en) | 1993-10-21 | 1993-10-21 | Gas replacement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5263516A JP2540442B2 (en) | 1993-10-21 | 1993-10-21 | Gas replacement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07125795A true JPH07125795A (en) | 1995-05-16 |
| JP2540442B2 JP2540442B2 (en) | 1996-10-02 |
Family
ID=17390627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5263516A Expired - Fee Related JP2540442B2 (en) | 1993-10-21 | 1993-10-21 | Gas replacement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2540442B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024271A (en) * | 2005-07-20 | 2007-02-01 | Chugoku Electric Power Co Inc:The | Gas displacement method and gas displacement unit in piping |
| JP2011521857A (en) * | 2008-05-30 | 2011-07-28 | ミリポア・コーポレイション | Vessel and system with vortex breaker |
| JP2011523922A (en) * | 2008-05-30 | 2011-08-25 | ミリポア・コーポレイション | Vessel and system with vortex breaker and fluid diverter |
| KR20230094653A (en) * | 2021-12-21 | 2023-06-28 | 한국해양대학교 산학협력단 | fire protection system for high pressure gas storage tank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104582A (en) * | 1980-12-15 | 1982-06-29 | Matsushita Electric Works Ltd | Displacing tank |
-
1993
- 1993-10-21 JP JP5263516A patent/JP2540442B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104582A (en) * | 1980-12-15 | 1982-06-29 | Matsushita Electric Works Ltd | Displacing tank |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024271A (en) * | 2005-07-20 | 2007-02-01 | Chugoku Electric Power Co Inc:The | Gas displacement method and gas displacement unit in piping |
| JP2011521857A (en) * | 2008-05-30 | 2011-07-28 | ミリポア・コーポレイション | Vessel and system with vortex breaker |
| JP2011523922A (en) * | 2008-05-30 | 2011-08-25 | ミリポア・コーポレイション | Vessel and system with vortex breaker and fluid diverter |
| JP2014051323A (en) * | 2008-05-30 | 2014-03-20 | E M D Millipore Corp | Container having vortex breaker and fluid diverter, and system |
| JP2015163534A (en) * | 2008-05-30 | 2015-09-10 | イー・エム・デイー・ミリポア・コーポレイシヨン | Container having vortex breaker and system |
| KR20230094653A (en) * | 2021-12-21 | 2023-06-28 | 한국해양대학교 산학협력단 | fire protection system for high pressure gas storage tank |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2540442B2 (en) | 1996-10-02 |
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