JP2007050149A - Gas-liquid mixture fire extinguishing method - Google Patents
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本発明は、密閉空間の火災時に窒素ガスと微噴霧を同時に放出して消火する気液混合消火方法に関する。
The present invention relates to a gas-liquid mixed fire extinguishing method in which nitrogen gas and fine spray are simultaneously released to extinguish a fire in a closed space fire.
従来、ガス系消火設備といえば、ハロン１３０１消火設備がその代表的な消火設備であったが、オゾン層を破壊する物質に関するモントリオール議定書の結果、ハロンガスの生産中止が決定し、消火剤として使用制限がかけられている。これに伴い二酸化炭素消火設備が代替設備として主流となったが、地球温暖化係数が高いこと、中毒性があり人体に悪影響を及ぼすことから、日本国内では環境に優しい、窒素ガス消火設備が主流となりつつある。 Traditionally speaking, gas-based fire extinguishing equipment was the Halon 1301 fire extinguishing equipment, but as a result of the Montreal Protocol concerning substances that destroy the ozone layer, it was decided that production of halon gas would be discontinued and restricted use as a fire extinguishing agent Has been applied. Along with this, carbon dioxide fire extinguishing equipment has become the mainstream as an alternative equipment, but because it has a high global warming potential, it is addictive and adversely affects the human body, environmentally friendly nitrogen gas fire extinguishing equipment is the mainstream in Japan. It is becoming.
しかし、窒素ガス消火設備は、酸素濃度低下による窒息消火であるため、他のガス系消火設備に比べ窒素ガスの放出量が多く、既存の施設に設置する際にガスボンベ設置場所の確保が問題となっている。 However, because nitrogen gas fire extinguishing equipment is a suffocation fire due to a decrease in oxygen concentration, the amount of nitrogen gas released is larger than other gas fire extinguishing equipment, and securing the installation location of gas cylinders when installing in existing facilities is a problem. It has become.
一方、密閉された空間の水系消火設備として微噴霧消火設備（ウォーターミスト消火設備）が知られている。微噴霧消火は、水の冷却効果、微噴霧の気化熱による著しい冷却効果、気化した水蒸気による窒息効果、更に水膜形成による遮断効果等の複合作用により、少水量で消火効果の高い設備として、研究が進められている。 On the other hand, a fine spray fire extinguishing equipment (water mist fire extinguishing equipment) is known as a water-based fire extinguishing equipment in a sealed space. Fine spray fire extinguishing is a facility with a small amount of water and a high fire extinguishing effect due to combined actions such as water cooling effect, remarkable cooling effect due to vaporization heat of fine spray, suffocation effect due to vaporized water vapor, and blocking effect due to water film formation, Research is ongoing.
しかしながら、水噴霧消火設備であっても、少水量化には限界があり、放出後の数分で噴霧が多量の水滴として表面化し、水損の原因となる可能性があること、局所放出以外では燃焼物により、消火できないものがあるという問題がある。 However, even with water spray fire extinguishing equipment, there is a limit to reducing the amount of water, and spraying may surface as a large amount of water droplets within a few minutes after release, which may cause water loss. Then, there is a problem that there are things that can not be extinguished due to combustion.
このような問題を解決するため密閉された空間に対し窒素ガスと水噴霧を同時に放出する気液混合型の消火設備が提案されている（特許文献１）。 In order to solve such a problem, a gas-liquid mixed type fire extinguishing facility that simultaneously discharges nitrogen gas and water spray to a sealed space has been proposed (Patent Document 1).
この気液混合型の消火設備は、例えば区画内に窒素ガスを放射して酸素濃度を１６〜１８％に低下させた後に、粒子径１０〜２００μｍの水微噴霧を放射して消火している。
しかしながら、このような従来の窒素ガスと水微噴霧を区画内に放射して消火する気液混合型の消火設備にあっては、窒素ガスを放射して酸素濃度を１６〜１８％とした状態で消火できる水微噴霧の放出量として、例えば２２．５ｍ３の区画に水噴霧放射用ノズルから１５０００ｇ／分の放出を行っており、この結果、区画の単位体積当りの水微噴霧量は毎分６６７ｇ／ｍ３となっている。 However, in such a gas-liquid mixed fire extinguishing equipment that radiates and extinguishes nitrogen gas and water fine spray into the compartment, the nitrogen concentration is radiated to an oxygen concentration of 16 to 18%. As a discharge amount of water fine spray that can be extinguished in, for example, 15000 g / min is discharged from a water spray radiation nozzle into a 22.5 m 3 compartment, and as a result, the amount of fine water spray per unit volume of the compartment is Min 667 g / m 3 .
このよう毎分６６７ｇ／ｍ３という水微噴霧の放出量は、区画に設置している機器からみる噴霧が多量の水滴として表面化し、相当水で濡れた状態（所謂びちゃびちゃ状態）であり、電気室やコンピュータルーム、或いはオフィスといった対象区画にあっては、水損被害をかなり被るという問題がある。 In this way, the amount of water spray sprayed at 667 g / m 3 per minute is a state where the spray seen from the equipment installed in the compartment is surfaced as a large amount of water droplets and is wet with a considerable amount of water (so-called shattered state). There is a problem that the target section such as a room, a computer room, or an office suffers from water damage.
このように従来の気液混合型の消火設備で水微噴霧量が多すぎる原因は、その消火実験において、水噴霧放射用ノズルから１５，０００ｇ／分（１５リットル／分）の放出を固定的に行うことを前提に、窒素ガスの放出量をどの程度にしたら、即ち酸素濃度をどの程度下げたら消火できるかを実験したことに起因しており、結局、水微噴霧を主流とした消火実験しか行っていない結果、水損被害の防止という見地からは許容できない量の水微噴霧の放出を行っている。 As described above, the cause of the excessive amount of fine water spray in the conventional gas-liquid mixing type fire extinguishing equipment is that the discharge of 15,000 g / min (15 liters / min) from the water spray radiation nozzle is fixed in the fire extinguishing experiment. As a result, it was caused by experimenting how much nitrogen gas was released, that is, how much oxygen concentration could be extinguished. However, as a result, the amount of fine water spray that is unacceptable from the viewpoint of preventing damage caused by water damage has been released.
本発明は、水損被害を最小限に抑えるように窒素ガスと水微噴霧を放射して火災を消火する気液混合消火方法を提供することを目的とする。
An object of the present invention is to provide a gas-liquid mixed fire extinguishing method that extinguishes a fire by radiating nitrogen gas and fine water spray so as to minimize damage to water damage.
本発明は、密閉された区画内の防護空間に、窒素ガスと粒径１０μｍ乃至２００μｍの微噴霧を放出して消火する気液混合消火方法に於いて、窒素ガスの放出濃度を、窒素ガスの所定の消火放出濃度から２５％乃至４５％減少させた濃度とし、微噴霧の放出濃度を８０ｇ／ｍ３至２４０ｇ／ｍ３としたことを特徴とする。
The present invention relates to a gas-liquid mixed fire extinguishing method in which a nitrogen gas and a fine spray having a particle diameter of 10 μm to 200 μm are discharged to a protective space in a sealed compartment to extinguish the fire. The concentration is reduced by 25% to 45% from the predetermined fire extinguishing release concentration, and the discharge concentration of the fine spray is 80 g / m 3 to 240 g / m 3 .
本発明によれば、窒息消火に必要な窒素ガスの消火放出濃度３３．６％を２５％〜４５％減少させた放出濃度とすることで、消火に必要な窒素ガスの放射量を大幅に低減し、ガスボンベの設置スペースを低減できる。 According to the present invention, the emission concentration of nitrogen gas necessary for extinguishing suffocation is reduced by 25% to 45% from the extinguishing emission concentration of 33.6% of nitrogen gas. In addition, the installation space for the gas cylinder can be reduced.
また窒素ガスと同時に放射している水微噴霧の放出濃度は８０ｇ／ｍ３〜２４０ｇ／ｍ３であり、これは従来の水噴霧方法で１分間放射した場合の放射濃度６６７ｇ／ｍ３に対し約１／１０〜約１／３であり、区画内の設置している機器の水損被害を大幅に低減することができる。
The release concentration of water atomization that simultaneously emit the nitrogen gas is 80g / m 3 ~240g / m 3 , which is to emit a concentration 667 g / m 3 in the case of radiation 1 minute in a conventional water spray method It is about 1/10 to about 1/3, and the water damage damage of the equipment installed in the section can be greatly reduced.
図１は本発明による気液混合消火方法が適用される消火設備の説明図である。図１において、消火対象となる密閉された防護区画１は、例えば電気室、コンピュータルーム、事務所などであり、制御盤１０から引き出された感知器回線に接続した火災感知器１１を設置している。
FIG. 1 is an explanatory diagram of fire extinguishing equipment to which a gas-liquid mixed fire extinguishing method according to the present invention is applied. In FIG. 1, a sealed protective compartment 1 to be extinguished is an electric room, a computer room, an office, etc., and a fire detector 11 connected to a sensor line drawn from the
防護区画１に対しては、窒素ガスを放出するガスノズル２と、水微噴霧を放出する微噴霧ヘッド３が設置されている。ガスノズル２に対しては、窒素ガスを充填したガスボンベ４が電動弁９を介して配管接続されている。ガスボンベ４からの配管は更に、電動弁８を介して消火剤容器５側に接続されている。 A gas nozzle 2 that discharges nitrogen gas and a fine spray head 3 that discharges fine water spray are installed in the protective section 1. A gas cylinder 4 filled with nitrogen gas is connected to the gas nozzle 2 through a motor-operated valve 9. The piping from the gas cylinder 4 is further connected to the extinguishant container 5 side via the motor operated valve 8.
消火剤容器５は、封止蓋６の装着による密封状態において気化を抑えた状態で消火液を貯蔵している。消火剤容器５の封止蓋６に対しては容器開放装置７が設けられる。容器開放装置７は窒素ガスのガス圧供給を受けた際に作動して封止蓋６を突き破り、消火剤容器５の密閉状態を解除して大気に開放させ、これによって消火液の微噴霧ヘッド３への供給を可能とする。 The fire extinguisher container 5 stores the fire extinguishing liquid in a state where vaporization is suppressed in a sealed state by mounting the sealing lid 6. A container opening device 7 is provided for the sealing lid 6 of the extinguishant container 5. The container opening device 7 operates when receiving a gas pressure supply of nitrogen gas and breaks through the sealing lid 6 to release the sealed state of the fire extinguisher container 5 and open it to the atmosphere. 3 can be supplied.
微噴霧ヘッド３に対しては、電動弁８を経由した窒素ガスを供給するための配管と、消火剤容器５からの配管の２つが接続されており、窒素ガスを微噴霧ヘッド３から放出する際に消火液を吸引し、微噴霧を発生させて消火を行う。 The fine spray head 3 is connected to a pipe for supplying nitrogen gas via the motor-operated valve 8 and a pipe from the fire extinguishing agent container 5, and discharges the nitrogen gas from the fine spray head 3. At that time, extinguish the fire by sucking out the fire extinguishing liquid and generating a fine spray.
図１の気液混合消火設備にあっては、制御盤１０が火災感知器１１からの火災検出信号による自動操作もしくは制御盤１０に対する手動操作により、電動弁８，９を開放動作し、ガスボンベ４に充填している窒素ガスをガスノズル２から防護区画１内に放出すると同時に、窒素ガスの供給で容器開放装置７を作動して封止蓋６を破り、微噴霧ヘッド３からの窒素ガスの放出により消火剤容器５の消火液を吸引して微噴霧を発生して放出し、防護区画１内を窒素ガスと微噴霧の気液混合状態として消火する。
In the gas-liquid mixed fire extinguishing system of FIG. 1, the
微噴霧ヘッド３から放出する微噴霧の平均粒子径は１０μｍ〜２００μｍとしている。この場合、粒子径が小さいほど防護区画１の空間に滞留する微噴霧の時間が長くなって消火効果が大きい。実用的には、本発明にあっては１０μｍ〜５０μｍ付近の粒子径が大部分を占める微噴霧を放出する。 The average particle size of the fine spray discharged from the fine spray head 3 is 10 μm to 200 μm. In this case, the smaller the particle size, the longer the time of fine spray staying in the space of the protective compartment 1 and the greater the fire extinguishing effect. Practically, in the present invention, a fine spray in which the particle diameter in the vicinity of 10 μm to 50 μm is predominant is released.
本発明の気液混合消火方法にあっては、消火実験を通じて、防護区画１における窒素ガスと微噴霧を所定時間、例えば１分以内に放出した場合の窒素ガスの放出濃度を、窒素ガスの消火放出濃度である３３．６％に対し２５％〜４５％減少させた窒素ガス放出濃度とし、且つ微噴霧の放出濃度を防護区画１に設置している機器の水損被害を最小限に抑えるため、８０ｇ／ｍ３〜２４０ｇ／ｍ３としている。 In the gas-liquid mixed fire extinguishing method of the present invention, through the fire extinguishing experiment, the nitrogen gas release concentration when the nitrogen gas and the fine spray in the protection section 1 are released within a predetermined time, for example, within 1 minute, is set as the nitrogen gas fire extinguishing. To reduce the nitrogen gas discharge concentration by 25% to 45% from the discharge concentration of 33.6%, and to minimize the water spray damage of the equipment installed in the protection zone 1 , it is set to 80g / m 3 ~240g / m 3 .
このような本発明による気液混合消火方法における窒素ガス放出濃度及び微噴霧の放出濃度は、次に説明する実験結果から決められたものである。 The nitrogen gas discharge concentration and the fine spray discharge concentration in the gas-liquid mixed fire extinguishing method according to the present invention are determined from the experimental results described below.
なお、ガス放出濃度の計算式は以下のようになる。
Ｃｖ＝｛１−ｅｘｐ（−Ｎ×Ｗｃ／Ｖａ）｝×１００
Ｃｖ：防護区画の消火剤濃度（％）
Ｎ：貯蔵容器の放出本数（本）
Ｗｃ：放出容器１本あたりの消火剤量（ｍ３／本）
（Ｎ３０＝３０Ｍｐａ容器のとき２０．３ｍ３／本）
Ｖａ：防護区画の純空間体積（ｍ３）
The calculation formula for the gas discharge concentration is as follows.
Cv = {1-exp (−N × Wc / Va)} × 100
Cv: concentration of extinguishing agent in protective compartment (%)
N: Number of storage containers released (book)
Wc: Extinguishing agent amount per discharge container (m 3 / book)
(When N30 = 30Mpa container, 20.3m 3 / bottle)
Va: Net volume of protected compartment (m 3 )
図２は本発明による気液混合消火方法の窒素ガス放出濃度と微噴霧の放出濃度を決めるための消火実験の結果を示している。この消火実験は５０ｍ３の防護区画の縮小モデルとして８ｍ３のモデルを作成し、図１のようにガスノズル２と微噴霧ヘッド３を設置し、約１分間で窒素ガスと微噴霧の放出を行った後の雰囲気中の窒素ガス放出濃度と微噴霧の放出濃度を測定したものである。 FIG. 2 shows the results of a fire extinguishing experiment for determining the nitrogen gas release concentration and the fine spray release concentration of the gas-liquid mixed fire extinguishing method according to the present invention. In this fire extinguishing experiment, an 8 m 3 model was created as a reduced model of a 50 m 3 protective compartment, and a gas nozzle 2 and a fine spray head 3 were installed as shown in FIG. 1, and nitrogen gas and fine spray were released in about 1 minute. After that, the nitrogen gas release concentration and the fine spray release concentration in the atmosphere were measured.
（実験結果Ａ１）窒素ガスのみの放出であり、窒素ガスの放出濃度を消火放出濃度として知られている３３．６％としており、窒素ガスのみで消火できた。 (Experimental result A1) It is discharge | release of only nitrogen gas, The discharge | release density | concentration of nitrogen gas was 33.6% known as a fire extinguishing discharge | release density | concentration, and it was able to extinguish only with nitrogen gas.
（実験結果Ａ２）窒素ガスのみの放出であり、窒素ガスの放出濃度を消火放出濃度３３．６％に対し３０％減らした。この場合、消火はできなかった。 (Experimental result A2) It is discharge | release of only nitrogen gas, The discharge | release density | concentration of nitrogen gas was reduced 30% with respect to the fire extinguishing discharge | emission density | concentration 33.6%. In this case, the fire could not be extinguished.
（実験結果Ａ３）窒素ガスと微噴霧の気液混合放射による消火である。窒素ガス放出濃度を消火放出濃度３３．６％に対し３０％減らした。微噴霧は平均粒径５０μｍで、放出濃度は１２０ｇ／ｍ３とした。この場合、消火はできた。 (Experimental result A3) Fire extinguishing by gas-liquid mixed radiation of nitrogen gas and fine spray. The nitrogen gas emission concentration was reduced by 30% against the fire extinguishing emission concentration of 33.6%. The fine spray had an average particle size of 50 μm and a release concentration of 120 g / m 3 . In this case, the fire was extinguished.
（実験結果Ａ４）窒素ガスと微噴霧の気液混合放射による消火である。窒素ガスの放出濃度は消火放出濃度３３．６％に対し４０％減らした。微噴霧は平均粒子径５０μｍで、放出濃度は１２０ｇ／ｍ３とした。この場合、消火ができた。 (Experimental result A4) Fire extinguishing by gas-liquid mixed radiation of nitrogen gas and fine spray. The nitrogen gas emission concentration was reduced by 40% against the fire extinguishing emission concentration of 33.6%. The fine spray had an average particle size of 50 μm and a release concentration of 120 g / m 3 . In this case, the fire was extinguished.
（実験結果Ａ５）窒素ガス放出濃度を消火放出濃度３３．６％に対し４０％減らし、微噴霧については平均粒子径を３０μｍとし、放出濃度は１２０ｇ／ｍ３とした場合である。この場合、消火できた。 (Experimental result A5) This is a case where the nitrogen gas release concentration is reduced by 40% with respect to the fire extinguishing release concentration of 33.6%, the average particle size is set to 30 μm for the fine spray, and the release concentration is set to 120 g / m 3 . In this case, the fire was extinguished.
（実験結果Ａ６）窒素ガス放出濃度を消火放出濃度３３．６％に対し４０％減らし、微噴霧については平均粒子径を１０μｍとし、放出濃度は８０ｇ／ｍ３とした。この場合には消火ができた。 (Experimental result A6) The nitrogen gas emission concentration was reduced by 40% with respect to the fire extinguishing emission concentration of 33.6%, the average particle diameter was set to 10 μm for the fine spray, and the emission concentration was set to 80 g / m 3 . In this case, the fire was extinguished.
（実験結果Ａ７）窒素ガスは放出せず、微噴霧のみの消火である。微噴霧は平均粒子径を５０μｍとし、放出濃度は１９０ｇ／ｍ３とした。この場合、消火はできなかった。 (Experimental result A7) Nitrogen gas is not released, but only a fine spray is extinguished. The fine spray had an average particle size of 50 μm and a release concentration of 190 g / m 3 . In this case, the fire could not be extinguished.
（実験結果Ａ８）窒素ガスは放出せず、微噴霧の放出のみとした場合であり、微噴霧の平均粒子径を３０μｍとし、放出濃度は１９０ｇ／ｍ３とした。この場合、消火はできなかった。 (Experimental result A8) Nitrogen gas was not released but only fine spray was released. The average particle diameter of the fine spray was 30 μm and the release concentration was 190 g / m 3 . In this case, the fire could not be extinguished.
（実験結果Ａ９）窒素ガスは放出せず、微噴霧のみを放出した場合であり、微噴霧の平均粒子径を１０μｍとし、放出濃度を８０ｇ／ｍ３とした。この場合、消火はできなかった。 (Experimental result A9) This is a case where only the fine spray is released without releasing nitrogen gas, the average particle size of the fine spray is 10 μm, and the release concentration is 80 g / m 3 . In this case, the fire could not be extinguished.
この図２に示した実験結果Ａ１〜Ａ９において、消火に成功した実験結果Ａ３〜Ａ６について見ると、窒素ガス放出濃度は消火放出濃度３３．６％に対し、消火に必要な窒素ガスの量を気液混合としたことで３０〜４０％減らすことができ、結果としてガスボンベ設置場所のサイズを大幅に低減できている。 In the experimental results A1 to A9 shown in FIG. 2, when looking at the experimental results A3 to A6 that succeeded in extinguishing, the nitrogen gas release concentration is 33.6%, and the amount of nitrogen gas necessary for extinguishing is By using gas-liquid mixing, it can be reduced by 30 to 40%, and as a result, the size of the gas cylinder installation place can be greatly reduced.
一方、微噴霧の放出については、放出濃度が８０ｇ／ｍ３〜１２０ｇ／ｍ３であり、従来の気液混合による消火方法が同じ１分間の放出で６６７ｇ／ｍ３であった場合と比べると、約１／１０〜約１／５に微噴霧の放出量を低減することができている。このような十分に少ない微噴霧と窒素ガスの放出による気液混合消火により、防護区画に設置している機器に対する水損被害は大幅に低減することができる。 On the other hand, the release of the fine spray, release concentration was 80g / m 3 ~120g / m 3 , compared with the case extinguishing method by the conventional gas-liquid mixing was 667 g / m 3 at the release of the same 1 minute The amount of fine spray discharged can be reduced to about 1/10 to about 1/5. By such a sufficiently small fine spray and gas-liquid mixed fire extinguishing due to the release of nitrogen gas, water damage damage to equipment installed in the protection compartment can be greatly reduced.
また条件結果Ａ３〜Ａ６から、微噴霧の粒子径が小さいほど放出濃度が少なくてよいことがわかる。このため、図１の微噴霧ヘッド３から放出される微噴霧の平均粒子径は１０μｍ〜２００μｍの範囲となるが、その中に占める１０μｍ〜５０μｍと粒子径の小さい側の割合を大きくするような微噴霧の放出を行うことが望ましい。また、微噴霧の粒子径が小さいほど防護区画に放出させる場合の空間における滞留時間が長くなり、消火効果が持続できる点でも望ましい。 In addition, it can be seen from condition results A3 to A6 that the smaller the fine spray particle size, the smaller the release concentration. For this reason, the average particle diameter of the fine spray discharged from the fine spray head 3 in FIG. 1 is in the range of 10 μm to 200 μm, but the ratio of 10 μm to 50 μm in the small particle diameter is increased. It is desirable to perform a fine spray release. In addition, the smaller the particle size of the fine spray, the longer the residence time in the space when discharging to the protective compartment, which is desirable in that the fire extinguishing effect can be sustained.
このような本発明の気液混合消火方法によれば、窒素ガスについては窒素ガスのみの消火に必要な消火放出濃度３３．６％に対し実験結果から２５％〜４５％の範囲は減らすことができ、消火に必要な炭酸ガスの貯蔵量及びそのガスボンベの設置スペースを大幅に低減できる。 According to the gas-liquid mixed fire extinguishing method of the present invention, the range of 25% to 45% can be reduced from the experimental results for the nitrogen gas, with the fire extinguishing release concentration of 33.6% required for the fire extinguishing only with the nitrogen gas. It is possible to significantly reduce the storage amount of carbon dioxide necessary for fire extinguishing and the installation space of the gas cylinder.
また微噴霧の放出濃度については８０ｇ／ｍ３〜２４０ｇ／ｍ３ の範囲で設定することができ、これは従来の微噴霧の放出濃度６６７ｇ／ｍ３に対し約１／１０〜約１／３に低減しており、防護区画に設置している機器の表面に付着する水の量を低減することで、水損被害を必要最小限に抑えることができる。 Also for the release concentration of atomization can be set in the range of 80g / m 3 ~240g / m 3 , which is about 1/10 to about relative emission concentration 667 g / m 3 of a conventional atomization 1/3 By reducing the amount of water adhering to the surface of equipment installed in the protective compartment, damage to water damage can be minimized.
図３は本発明による気液混合消火方法が適用される他の消火設備の説明図である。図３において、この消火設備にあっては、消火剤容器５に対し電動弁９，８を介して窒素ガスのガス圧を供給するガスボンベ４からの配管を接続しており、制御盤１０による消火起動制御により電動弁８，９を開いた際に、窒素ガスを消火剤容器５に加えて消火剤を加圧し、この加圧により消火剤を微噴霧ヘッド３に押し出して供給し、別の配管から供給された窒素ガスによる噴出で微噴霧を発生するようにしている。他の構成は図１の設備と同じである。 FIG. 3 is an explanatory view of another fire extinguishing equipment to which the gas-liquid mixed fire extinguishing method according to the present invention is applied. In FIG. 3, in this fire extinguishing equipment, a pipe from a gas cylinder 4 for supplying a gas pressure of nitrogen gas to the fire extinguisher container 5 through motor-operated valves 9 and 8 is connected. When the motorized valves 8 and 9 are opened by the start control, nitrogen gas is added to the fire extinguisher container 5 to pressurize the fire extinguisher. The fine spray is generated by the ejection of nitrogen gas supplied from the factory. The other structure is the same as the installation of FIG.
なお、上述の実施形態における消火放出濃度３３．６％やその他の放出濃度において、設計上は安全率１．２を乗じた値が使われ、消火放出濃度３３．６％は１．２を乗じた４０．３％が設計上の消火放出濃度となる。 In the above-described embodiment, the fire extinguishing emission concentration of 33.6% and other emission concentrations are designed to be multiplied by a safety factor of 1.2, and the fire extinguishing emission concentration of 33.6% is multiplied by 1.2. Furthermore, 40.3% is the designed firefighting emission concentration.
また図１及び図３の消火設備にあっては、消火時にガスノズル２からの窒素ガスの放出と微噴霧ヘッド３からの水微噴霧の放出を同時に行っているが、窒素ガスと微噴霧のいずれか一方を先に放出し、その後に残りの方を放出する時間ずれによる放出を行ってもよい。 Further, in the fire extinguishing equipment shown in FIGS. 1 and 3, the nitrogen gas is released from the gas nozzle 2 and the fine water spray from the fine spray head 3 at the same time when the fire is extinguished. It is also possible to perform discharge by time lag in which one of them is released first and then the remaining one is released.
本発明にあっては、窒素ガスと微噴霧の放出による消火開始から一定時間後に、防護区画１の雰囲気中において窒素ガスの放出濃度が消火放出濃度の２５％〜４５％減で、微噴霧の放出濃度が８０ｇ／ｍ３〜２４０ｇ／ｍ３ となっていればよく、そこに至るまでの窒素ガス及び微噴霧の放出の順番や手順に対する制限は特にない。 In the present invention, after a certain period of time from the start of fire extinguishing due to the release of nitrogen gas and fine spray, the discharge concentration of nitrogen gas is reduced by 25% to 45% of the fire extinguishing discharge concentration in the atmosphere of the protective compartment 1, and it is sufficient emission concentration becomes 80g / m 3 ~240g / m 3 , in particular not limited to nitrogen gas and the order and procedures atomization release up to there.
また本発明の気液混合消火方法による窒素ガスの放出濃度及び微噴霧の放出濃度を達成するまでの消火開始からの時間は、上記の実施形態に示した１分に限定されることなく、可能な限り速やかな短時間となる任意の一定時間に必要な濃度に達する窒素ガスと微噴霧の噴出ができればよい。 Further, the time from the start of fire extinguishing until the nitrogen gas release concentration and the fine spray release concentration by the gas-liquid mixed fire extinguishing method of the present invention are achieved is not limited to 1 minute shown in the above embodiment. It is only necessary to be able to eject nitrogen gas and fine spray that reach a necessary concentration for an arbitrary fixed time that is as short as possible.
更に、最初の窒素ガス及び微噴霧の放出で本発明の気液混合方法による窒素ガスの放出濃度及び微噴霧の放出濃度が満足された後は、この状態を維持するための必要な窒素ガス及び微噴霧の噴出を継続するようにする。 Furthermore, after the first nitrogen gas and fine spray discharge satisfy the nitrogen gas discharge concentration and the fine spray discharge concentration by the gas-liquid mixing method of the present invention, the nitrogen gas necessary to maintain this state and Continue to spray fine spray.
特に微噴霧については、放出してから時間の経過に伴って落下して濃度が低下する傾向にあることから、窒素ガスについては予定した消火放出濃度に達した後は停止してもよいが、微噴霧についてはその後も本発明に必要な微噴霧放出濃度を維持できる程度の微量の噴霧を継続することが望ましい。 Especially for fine spray, since it tends to drop and decrease in concentration with the passage of time after release, nitrogen gas may stop after reaching the planned fire extinguishing release concentration, As for the fine spray, it is desirable to continue the fine spray that can maintain the fine spray release concentration necessary for the present invention.
もちろん微噴霧の放出を行う消火剤容器５の貯蔵量には制約があるため、消火剤がなくなったときは微噴霧を停止するし、また消火剤の貯蔵量として最初の予定放出濃度に達するための放出量に加えて、維持するための放出量を加えた貯蔵量とすることが望ましい。
Of course, because the amount of fire extinguisher container 5 that discharges fine spray is limited, when the fire extinguisher runs out, the fine spray is stopped and the initial planned release concentration is reached as the amount of extinguisher stored. In addition to the amount released, it is desirable that the amount stored be a release amount to maintain.
１：防護区画
２：ガスノズル
３：微噴霧ヘッド
４：ガスボンベ
５：消火剤容器
６：封止蓋
７：容器開放装置
８，９：電動弁
１０：制御盤
１１：火災感知器
1: Protective section 2: Gas nozzle 3: Fine spray head 4: Gas cylinder 5: Fire extinguisher container 6: Sealing lid 7: Container opening device 8, 9: Motorized valve 10: Control panel 11: Fire detector
Claims (1)
窒素ガスの放出濃度を、窒素ガスの所定の消火放出濃度から２５％乃至４５％減少させた濃度とし、微噴霧の放出濃度を８０ｇ／ｍ３乃至２４０ｇ／ｍ３としたことを特徴とする気液混合消火方法。 In a gas-liquid mixed fire extinguishing method in which nitrogen gas and a fine spray with a particle size of 10 μm to 200 μm are discharged into a protective space in a sealed compartment to extinguish the fire.
The nitrogen gas discharge concentration is reduced by 25% to 45% from the predetermined extinguishing discharge concentration of nitrogen gas, and the discharge concentration of fine spray is 80 g / m 3 to 240 g / m 3. Liquid mixture fire extinguishing method.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010216118A (en) * | 2009-03-16 | 2010-09-30 | Hochiki Corp | Fire extinguishing equipment |
| JP2011072704A (en) * | 2009-10-01 | 2011-04-14 | Hochiki Corp | Gas-liquid mixing equipment and fire extinguishing control method for the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833730A (en) * | 1994-07-22 | 1996-02-06 | Nohmi Bosai Ltd | Method and apparatus for fire extinguishment and burning restriction |
| JPH08332244A (en) * | 1995-06-09 | 1996-12-17 | Yamato Protec Co | Method of extinguishing fire by spraying water |
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2005
- 2005-08-19 JP JP2005238367A patent/JP2007050149A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833730A (en) * | 1994-07-22 | 1996-02-06 | Nohmi Bosai Ltd | Method and apparatus for fire extinguishment and burning restriction |
| JPH08332244A (en) * | 1995-06-09 | 1996-12-17 | Yamato Protec Co | Method of extinguishing fire by spraying water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010216118A (en) * | 2009-03-16 | 2010-09-30 | Hochiki Corp | Fire extinguishing equipment |
| JP2011072704A (en) * | 2009-10-01 | 2011-04-14 | Hochiki Corp | Gas-liquid mixing equipment and fire extinguishing control method for the same |
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