JP6270397B2 - Liquefied carbon dioxide recovery method - Google Patents

Liquefied carbon dioxide recovery method Download PDF

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JP6270397B2
JP6270397B2 JP2013210721A JP2013210721A JP6270397B2 JP 6270397 B2 JP6270397 B2 JP 6270397B2 JP 2013210721 A JP2013210721 A JP 2013210721A JP 2013210721 A JP2013210721 A JP 2013210721A JP 6270397 B2 JP6270397 B2 JP 6270397B2
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映幸 大槻
映幸 大槻
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Nippon Dry Chemical Co Ltd
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本発明は、ガス系消火設備で消火剤として使用される液化炭酸ガスを貯蔵するガス貯蔵容器や、消火器で使用される消火剤としての液化炭酸ガスを貯蔵するガス貯蔵容器（消火器本体）や、ガス系消火設備または消火器に収容されている消火薬剤を圧送するための液化炭酸ガスを貯蔵するガス貯蔵容器等から液化炭酸ガスを回収する液化炭酸ガス回収方法に関するものである。   The present invention relates to a gas storage container for storing liquefied carbon dioxide gas used as a fire extinguishing agent in a gas fire extinguishing facility, and a gas storage container for storing liquefied carbon dioxide gas as a fire extinguishing agent used in a fire extinguisher (extinguisher main body) The present invention also relates to a liquefied carbon dioxide recovery method for recovering liquefied carbon dioxide from a gas storage container or the like for storing liquefied carbon dioxide for pumping out a fire extinguishing agent accommodated in a gas fire extinguishing facility or a fire extinguisher.

従来、消火対象区画内に消火剤として不活性ガスである炭酸ガスを放出し、消火対象区画内の炭酸ガス濃度を消炎濃度以上に維持することにより消火するガス系消火設備が実用化されている。かかるガス系消火設備では、消火剤として使用される炭酸ガスは、加圧液化され、液化炭酸ガスとしてガス貯蔵容器内に充填された状態で消火設備内に保管されており、火災の際に、ガス貯蔵容器に設けられている容器弁が開放し、ガス貯蔵容器内の液化炭酸ガスが配管を介して噴射ヘッドまで送られ、噴射ヘッドから放出された液化炭酸ガスは瞬時に気化して消火対象区画内に充満して鎮火するようになっている（例えば、特許文献１参照。）。
また、液化炭酸ガスを消火剤として使用する消火器では、消火剤として使用される炭酸ガスは、加圧液化され、液化炭酸ガスとしてガス貯蔵容器内に充填されており、火災の際に、消火器に設けられている容器弁を開放し、ガス貯蔵容器内の液化炭酸ガスを噴射ヘッドから放出し、気化した液化炭酸ガスを消火対象区画内に充満させて鎮火するようになっている。
また、消火薬剤を圧送するために液化炭酸ガスを使用する消火器では、火災の際にガス貯蔵容器から液化炭酸ガスを放出し、消火薬剤を火元に圧送して鎮火するようになっている。 Conventionally, gas-based fire extinguishing equipment that extinguishes fire by releasing carbon dioxide, which is an inert gas, as a fire extinguisher into the fire extinguishing target section and maintaining the carbon dioxide concentration in the fire extinguishing target section above the flame extinguishing concentration has been put into practical use. . In such gas fire extinguishing equipment, carbon dioxide gas used as a fire extinguishing agent is liquefied under pressure and stored in the fire extinguishing equipment in a state of being filled in a gas storage container as liquefied carbon dioxide gas. The container valve provided in the gas storage container is opened, and the liquefied carbon dioxide in the gas storage container is sent to the injection head via the pipe, and the liquefied carbon dioxide released from the injection head is instantly vaporized and extinguished. The compartment is filled and extinguished (see, for example, Patent Document 1).
In addition, in a fire extinguisher that uses liquefied carbon dioxide as a fire extinguisher, the carbon dioxide used as a fire extinguisher is liquefied under pressure and filled in a gas storage container as liquefied carbon dioxide. The container valve provided in the vessel is opened, liquefied carbon dioxide gas in the gas storage container is discharged from the jet head, and the vaporized liquefied carbon dioxide gas is filled in the fire extinguishing target section to extinguish the fire.
In addition, in a fire extinguisher that uses liquefied carbon dioxide to pump out the fire extinguishing agent, the liquefied carbon dioxide gas is released from the gas storage container in the event of a fire, and the extinguishing agent is pumped to the fire source to extinguish the fire. .

このようなガス系消火設備や消火器に対し、消防法に基づく点検要領が改正（平成２１年３月３１日消防予第１３２号）され、設置後に規定年数を経過したガス貯蔵容器は、容器弁の安全性に関する機器点検を行うことが必要となった。
ガス貯蔵容器の容器弁の点検を行う場合、ガス貯蔵容器から容器弁を取り外さなければならず、ガス貯蔵容器から容器弁を取り外すには、ガス貯蔵容器内に充填されている液化炭酸ガスを放出することが必須となる。
従来のガス系消火設備や消火器におけるガス貯蔵容器の容器弁の点検では、ガス貯蔵容器から容器弁を取り外す際にガス貯蔵容器から放出する液化炭酸ガスの回収については全く考慮されておらず、大気中に放出されることになる。 For such gas fire extinguishing equipment and fire extinguishers, the inspection procedure based on the Fire Service Act has been revised (March 31, 2009, Fire Preliminary No. 132), and gas storage containers that have passed the specified years after installation are It was necessary to conduct equipment inspections regarding valve safety.
When checking the container valve of the gas storage container, the container valve must be removed from the gas storage container. To remove the container valve from the gas storage container, the liquefied carbon dioxide gas filled in the gas storage container is released. It is essential to do.
In the inspection of the container valve of the gas storage container in the conventional gas fire extinguishing equipment or fire extinguisher, the recovery of the liquefied carbon dioxide released from the gas storage container when removing the container valve from the gas storage container is not considered at all. It will be released into the atmosphere.

特開２０１２−６３０１６号公報JP 2012-63016 A

上記のように、従来のガス系消火設備や消火器におけるガス貯蔵容器の容器弁の点検では、ガス貯蔵容器から容器弁を取り外す際にガス貯蔵容器から放出する液化炭酸ガスは大気中に放出されるので、地球温暖化にもつながり好ましくなく、また液化炭酸ガスの無駄になるといった問題がある。
また、ガス貯蔵容器から容器弁を取り外す際に、ガス貯蔵容器から高圧の液化炭酸ガスが放出するので、ガス貯蔵容器からの容器弁の取り外しは困難で非常に危険な作業となるといった問題がある。 As described above, in the inspection of the container valve of the gas storage container in the conventional gas fire extinguishing equipment and fire extinguisher, the liquefied carbon dioxide gas released from the gas storage container when the container valve is removed from the gas storage container is released into the atmosphere. Therefore, there is a problem that it leads to global warming and is not preferable, and liquefied carbon dioxide gas is wasted.
Further, when removing the container valve from the gas storage container, high-pressure liquefied carbon dioxide gas is released from the gas storage container. Therefore, it is difficult to remove the container valve from the gas storage container, which is a very dangerous operation. .

本発明の目的は、ガス系消火設備や消火器で消火剤として使用され、あるいは消火器で消火薬剤を圧送する貯めに使用される液化炭酸ガスを貯蔵するガス貯蔵容器から液化炭酸ガスを容易に且つ確実に回収することができ、また、ガス貯蔵容器からの容器弁の取り外しを安全に且つ容易に行えるようにした液化炭酸ガス回収方法を提供することにある。   The object of the present invention is to facilitate the use of liquefied carbon dioxide from a gas storage container that stores liquefied carbon dioxide that is used as a fire extinguishing agent in a gas fire extinguishing facility or a fire extinguisher, or used to pump out a fire extinguishing agent in a fire extinguisher. Another object of the present invention is to provide a method for recovering liquefied carbon dioxide gas that can be reliably recovered and that enables the container valve to be removed from the gas storage container safely and easily.

上記の目的を達成するために、請求項１に記載の発明は、液化炭酸ガスを貯蔵するガス貯蔵容器から液化炭酸ガスを回収する液化炭酸ガス回収方法であって、液化炭酸ガスを貯蔵している前記ガス貯蔵容器を液化炭酸ガス貯留槽に接続し、前記ガス貯蔵容器の容器弁を開き前記ガス貯蔵容器内の圧力と前記液化炭酸ガス貯留槽内の圧力との差圧を利用して前記ガス貯蔵容器内の液化炭酸ガスを前記液化炭酸ガス貯留槽に回収し、前記ガス貯蔵容器内と前記液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなし、前記ガス貯蔵容器の前記容器弁を閉じ、前記ガス貯蔵容器を前記液化記炭酸ガス貯留槽から分離する液化炭酸ガス回収工程と、前工程で前記液化炭酸ガス貯留槽から分離した前記ガス貯蔵容器をガス貯留槽に接続し、前記ガス貯蔵容器の容器弁を開き前記ガス貯蔵容器内の圧力と前記ガス貯留槽内の圧力との差圧を利用して前記ガス貯蔵容器内に残存するガス或いはガスと液化炭酸ガスが混合した残存ガスを前記ガス貯留槽に回収し、前記ガス貯蔵容器内と前記ガス貯留槽内が同圧になった時点で残存ガス回収とみなし、前記ガス貯蔵容器と前記ガス貯留槽を分離する残存ガス回収工程と、前記ガス貯留槽内に回収した残存ガスを加圧して、前記液化炭酸ガスを回収した前記液化炭酸ガス貯留槽に送り込む残存ガス液化工程を含み、前記液化炭酸ガス貯留槽は内部を冷却する冷却手段を備えており、前記ガス貯蔵容器からの液化炭酸ガスの回収中に、前記液化炭酸ガス貯留槽内を冷却して前記液化炭酸ガス貯留槽内の圧力が液化炭酸ガス回収みなし圧力を超えない範囲に制御することを特徴とする。 In order to achieve the above object, the invention described in claim 1 is a liquefied carbon dioxide gas recovery method for recovering liquefied carbon dioxide gas from a gas storage container for storing liquefied carbon dioxide gas, wherein the liquefied carbon dioxide gas is stored. It said gas storage vessel connected to the liquefied carbon dioxide storage tank, wherein by utilizing the pressure difference between the pressure and the pressure of the liquefied carbon dioxide storage tank in the gas storage vessel to open the container valve of the gas storage vessel are the liquefied carbon dioxide in the gas storage vessel to recover the liquefied carbon dioxide storage tank, the liquefied carbon dioxide storage tank and the gas storage vessel regarded as liquefied carbon dioxide recovery as they become the same pressure, the gas storage closing said container valve of the container, the gas storage vessel and liquefied carbon dioxide recovery step of separating from the liquefied SL carbon dioxide storage tank, pre-process gas reservoir the gas reservoir separated from the liquefied carbon dioxide storage tank in Connect to Mixed gas or gas and liquefied carbon dioxide by utilizing the differential pressure remaining in the gas storage vessel and the pressure of the pressure between the gas storage tank in the gas storage vessel to open the container valve of the gas storage vessel the remaining gas was collected in the gas storage tank, the gas storage tank and the gas storage vessel regarded as residual gas recovery as they become the same pressure, the residual gas to separate the gas reservoir and the gas reservoir a recovery step, by pressurizing the residual gas collected in the gas storage tank, including residual gas liquefaction process wherein feeding the liquefied carbon dioxide in the liquefied carbon dioxide storage tank recovered, the liquefied carbon dioxide storage tank is the internal Cooling means for cooling, and during the recovery of the liquefied carbon dioxide gas from the gas storage container, the inside of the liquefied carbon dioxide gas storage tank is cooled and the pressure in the liquefied carbon dioxide gas storage tank is regarded as the liquefied carbon dioxide gas recovery pressure The And controlling the e no range.

請求項２に記載の発明は、請求項１に記載の、前記ガス貯蔵容器内と前記液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなす前記液化炭酸ガス貯留槽内の圧力は、前記ガス貯蔵容器内の液化炭酸ガスが回収されたとみなされる前記ガス貯蔵容器内の圧力として予め設定された液化炭酸ガス回収みなし圧力を超えない範囲内の圧力であり、前記ガス貯蔵容器内と前記ガス貯留槽内が同圧になった時点で残存ガス回収とみなす前記ガス貯留槽内の圧力は、前記ガス貯蔵容器内の残存ガスが回収されたとみなされる前記ガス貯蔵容器内の圧力として予め設定された残存ガス回収みなし圧力を超えない範囲内の圧力であることを特徴とする。 The invention according to claim 2, claim 1 according to the gas storage vessel and the liquefied carbon dioxide storage tank is considered as liquefied carbon dioxide recovery as they become the same pressure the liquefied carbon dioxide storage tank the pressure is the pressure within the range liquefied carbon dioxide gas does not exceed a preset liquefied carbon dioxide recovered regarded pressure as the pressure of the gas storage vessel is considered to have been recovered in the gas storage container, the gas storage the pressure of the gas storage tank to the said gas reservoir vessel considered as residual gas recovery as they become the same pressure, the gas storage vessel remaining gas in the gas storage vessel is considered to have been recovered The pressure is within a range that does not exceed a residual gas recovery assumed pressure set in advance as a pressure.

請求項３に記載の発明は、請求項１または２のいずれか１に記載の、前記残存ガス回収工程と前記残存ガス液化工程とは並行して行うことを特徴とする。
請求項４に記載の発明は、請求項１から３までのいずれか１に記載の、前記液化炭酸ガス貯留槽に備えた前記冷却手段は、前記液化炭酸ガス貯留槽に冷却コイルを内蔵し，前記冷却コイルに冷却ガスを送り込み、前記液化炭酸ガス貯留槽の内部を冷却するものであることを特徴とする。 The invention according to claim 3 is characterized in that the residual gas recovery step and the residual gas liquefaction step according to any one of claims 1 and 2 are performed in parallel .
According to a fourth aspect of the present invention, the cooling means provided in the liquefied carbon dioxide storage tank according to any one of the first to third aspects includes a cooling coil built in the liquefied carbon dioxide storage tank, A cooling gas is fed into the cooling coil to cool the inside of the liquefied carbon dioxide storage tank.

請求項１に記載の液化炭酸ガス回収方法によれば、液化炭酸ガスを貯蔵しているガス貯蔵容器を液化炭酸ガス貯留槽に接続し、ガス貯蔵容器の容器弁を開きガス貯蔵容器内の圧力と液化炭酸ガス貯留槽内の圧力との差圧を利用してガス貯蔵容器内の液化炭酸ガスを液化炭酸ガス貯留槽に回収するので、液化炭酸ガスを容易に回収することができ、そして、ガス貯蔵容器内と液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなすので、ガス貯蔵容器から所定量の液化炭酸ガスを確実に回収することができる。
そして、液化炭酸ガスを回収したガス貯蔵容器をガス貯留槽に接続し、ガス貯蔵容器の容器弁を開きガス貯蔵容器内の圧力とガス貯留槽内の圧力との差圧を利用してガス貯蔵容器内に残存するガス或いはガスと液化炭酸ガスが混合した残存ガスをガス貯留槽に回収するので、ガス貯蔵容器内に残存する残存ガスを容易に回収することができ、そして、ガス貯蔵容器内とガス貯留槽内が同圧になった時点で残存ガス回収とみなし、ガス貯留槽内に回収した残存ガスは加圧して、液化炭酸ガスを回収した液化炭酸ガス貯留槽に送り込むので、加圧されて液化炭酸ガス貯留槽に送り込まれた残存ガスは液化炭酸ガス貯留槽内の冷却されている液化炭酸ガスで冷却されて液化されることから、ガス貯蔵容器内の液化炭酸ガスの殆どを液化炭酸ガス貯留槽に確実に回収することができる。
このように、ガス貯蔵容器から液化炭酸ガスを液化炭酸ガス貯留槽に確実に回収することができるので、液化炭酸ガスによる地球温暖化防止に寄与するとともに、液化炭酸ガスの再利用が図れ、経済的にも優れたものとなる。
さらには、残存ガスが回収されたガス貯蔵容器内には、ガスが殆ど残っておらず、或いは残っていても僅かなので、ガス貯蔵容器の容器弁の点検の際に、ガス貯蔵容器から容器弁を安全に取り外すことができる。
そして、前記液化炭酸ガス貯留槽は内部を冷却する冷却手段を備えており、ガス貯蔵容器からの液化炭酸ガスの回収中に、液化炭酸ガス貯留槽内を冷却して液化炭酸ガス貯留槽内の圧力が液化炭酸ガス回収みなし圧力を超えない範囲に制御するので、液化炭酸ガスの回収により上昇した液化炭酸ガス貯留槽内の圧力を下げることにより、液化炭酸ガス貯留槽における液化炭酸ガスの回収量を増加させることができる。 According to the method for recovering liquefied carbon dioxide according to claim 1, the gas storage container storing the liquefied carbon dioxide gas is connected to the liquefied carbon dioxide gas storage tank, the container valve of the gas storage container is opened, and the pressure in the gas storage container Since the liquefied carbon dioxide gas in the gas storage container is recovered in the liquefied carbon dioxide gas storage tank using the differential pressure between the pressure and the pressure in the liquefied carbon dioxide gas storage tank, the liquefied carbon dioxide gas can be easily recovered, and Since the liquefied carbon dioxide gas is considered to be recovered when the pressure in the gas storage container and the liquefied carbon dioxide gas storage tank reaches the same pressure, a predetermined amount of liquefied carbon dioxide gas can be reliably recovered from the gas storage container.
And the gas storage container which collect | recovered liquefied carbon dioxide gas is connected to a gas storage tank, the container valve of a gas storage container is opened, and gas storage is performed using the pressure difference between the pressure in a gas storage container and the pressure in a gas storage tank. Since the gas remaining in the container or the residual gas in which the gas and liquefied carbon dioxide are mixed is recovered in the gas storage tank, the residual gas remaining in the gas storage container can be easily recovered, and the gas storage container When the pressure in the gas storage tank reaches the same pressure, the residual gas is considered to be recovered, and the residual gas recovered in the gas storage tank is pressurized and sent to the recovered liquefied carbon dioxide storage tank. Since the residual gas sent to the liquefied carbon dioxide storage tank is cooled and liquefied by the liquefied carbon dioxide gas cooled in the liquefied carbon dioxide storage tank, most of the liquefied carbon dioxide in the gas storage container is liquefied. Carbon dioxide storage It can be reliably recovered to.
As described above, since liquefied carbon dioxide gas can be reliably recovered from the gas storage container to the liquefied carbon dioxide gas storage tank, it contributes to the prevention of global warming by the liquefied carbon dioxide gas, and the liquefied carbon dioxide gas can be reused. It will be excellent.
Furthermore, since there is little or no gas remaining in the gas storage container from which the residual gas has been recovered, when the container valve of the gas storage container is inspected, the container valve Can be safely removed.
The liquefied carbon dioxide storage tank is provided with a cooling means for cooling the inside, and during the recovery of the liquefied carbon dioxide gas from the gas storage container, the liquefied carbon dioxide storage tank is cooled to Since the pressure is controlled within the range that does not exceed the liquefied carbon dioxide recovery pressure, the amount of liquefied carbon dioxide recovered in the liquefied carbon dioxide storage tank can be reduced by lowering the pressure in the liquefied carbon dioxide storage tank that has risen due to the recovery of liquefied carbon dioxide gas. Can be increased.

請求項２に記載の液化炭酸ガス回収方法によれば、請求項１に記載の、前記ガス貯蔵容器内と液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなす液化炭酸ガス貯留槽内の圧力は、ガス貯蔵容器内の液化炭酸ガスが回収されたとみなされるガス貯蔵容器内の圧力として予め設定された液化炭酸ガス回収みなし圧力を超えない範囲内の圧力であるので、ガス貯蔵容器内の液化している炭酸ガスの殆どを回収することができる。
そして、前記ガス貯蔵容器内とガス貯留槽内が同圧になった時点で残存ガス回収とみなすガス貯留槽内の圧力は、ガス貯蔵容器内の残存ガスが回収されたとみなされるガス貯蔵容器内の圧力として予め設定された残存ガス回収みなし圧力を超えない範囲内の圧力であるので、残存ガスが回収されたガス貯蔵容器内には、ガスが殆ど残っておらず、或いは残っていても僅かとなり、ガス貯蔵容器内の圧力は大気圧と殆ど変わらなくなるので、ガス貯蔵容器の容器弁の点検の際に、ガス貯蔵容器から容器弁を安全に取り外すことができるとともに、容器弁の取り外しの際、放出される炭酸ガスも僅かであるので地球温暖化に殆ど影響はない。 According to the liquefied carbon dioxide recovery method of claim 2, the liquefied carbon dioxide considered as liquefied carbon dioxide recovery when the inside of the gas storage container and the inside of the liquefied carbon dioxide storage tank are at the same pressure. Since the pressure in the gas storage tank is a pressure within a range that does not exceed the liquefied carbon dioxide recovery assumed pressure set in advance as the pressure in the gas storage container in which the liquefied carbon dioxide gas in the gas storage container is considered recovered, Most of the liquefied carbon dioxide in the gas storage container can be recovered.
The pressure in the gas storage tank that is regarded as the residual gas recovery when the pressure in the gas storage container and the gas storage tank reaches the same pressure is the same as that in the gas storage container in which the residual gas in the gas storage container is considered recovered. Since the pressure is within a range that does not exceed the preset residual gas recovery pressure, the gas storage container from which the residual gas is recovered has little or no gas remaining. Since the pressure in the gas storage container is almost the same as the atmospheric pressure, the container valve can be safely removed from the gas storage container and the container valve can be removed when checking the container valve of the gas storage container. The amount of carbon dioxide released is small, so there is little effect on global warming.

請求項３に記載の液化炭酸ガス回収方法によれば、請求項１または２のいずれか１に記載の、残存ガス回収工程と残存ガス液化工程とは並行して行うので、ガス貯蔵容器内の液化炭酸ガスの殆どを液化炭酸ガス貯留槽に確実に回収することができる。
また、請求項４に記載の液化炭酸ガス回収方法によれば、請求項１から３までのいずれか１に記載の、液化炭酸ガス貯留槽に備えた冷却手段は、液化炭酸ガス貯留槽に冷却コイルを内蔵し，前記冷却コイルに冷却ガスを送り込み、液化炭酸ガス貯留槽の内部を冷却するものであるので、液化炭酸ガス貯留槽の内部を確実に冷却することができる。 According to the method for recovering liquefied carbon dioxide according to claim 3, since the residual gas recovery step and the residual gas liquefaction step according to any one of claims 1 and 2 are performed in parallel, Most of the liquefied carbon dioxide gas can be reliably recovered in the liquefied carbon dioxide gas storage tank.
Moreover, according to the liquefied carbon dioxide gas recovery method according to claim 4, the cooling means provided in the liquefied carbon dioxide gas storage tank according to any one of claims 1 to 3 is cooled to the liquefied carbon dioxide gas storage tank. Since the coil is incorporated and the cooling gas is sent to the cooling coil to cool the inside of the liquefied carbon dioxide storage tank, the inside of the liquefied carbon dioxide storage tank can be reliably cooled.

本発明に係る液化炭酸ガス回収方法を実施する液化炭酸ガス回収システムの一例を示す概略説明図である。It is a schematic explanatory drawing which shows an example of the liquefied carbon dioxide recovery system which implements the liquefied carbon dioxide recovery method concerning the present invention.

以下、本発明に係る液化炭酸ガス回収方法の実施の形態を、図１に示す液化炭酸ガス回収システムにより説明する。
先ず、本発明に係る液化炭酸ガス回収方法を実施する液化炭酸ガス回収システムについて説明する。
本発明を実施する液化炭酸ガス回収システムは、図１に示すように、ガス貯蔵容器１から回収する液化炭酸ガスを収容する液化炭酸ガス貯留槽２と、液化炭酸ガスが回収されたガス貯蔵容器１ａから回収する残存ガスを収容するガス貯留槽３を備えている。 Hereinafter, an embodiment of a liquefied carbon dioxide recovery method according to the present invention will be described with reference to a liquefied carbon dioxide recovery system shown in FIG.
First, a liquefied carbon dioxide recovery system that implements the liquefied carbon dioxide recovery method according to the present invention will be described.
As shown in FIG. 1, the liquefied carbon dioxide recovery system for carrying out the present invention includes a liquefied carbon dioxide storage tank 2 for storing liquefied carbon dioxide recovered from the gas storage container 1, and a gas storage container from which the liquefied carbon dioxide is recovered. A gas storage tank 3 for storing the residual gas recovered from 1a is provided.

液化炭酸ガス貯留槽２は、液化炭酸ガス貯留槽２とガス貯蔵容器３を接続し、ガス貯蔵容器１から液化炭酸ガスを液化炭酸ガス貯留槽２に回収する液回収配管４を備えており、液回収配管４の先端には、ガス貯蔵容器１の容器弁５に取り付けられ、容器弁５を開口するガス回収用治具６が設けられている。本例のシステムでは、液回収配管４の先端が複数に分岐する分岐管４ａ，４ｂ，４ｃ，４ｄ，４ｅとなっており、それぞれの分岐管４ａ，４ｂ，４ｃ，４ｄ，４ｅの先端にガス回収用治具６が設けられており、一度に複数のガス貯蔵容器１が接続できるようになっている。ガス回収用治具６にあっては、容器弁５を開口できるものであれば、その構成は特に限定されない。   The liquefied carbon dioxide storage tank 2 includes a liquid recovery pipe 4 that connects the liquefied carbon dioxide storage tank 2 and the gas storage container 3 and recovers the liquefied carbon dioxide gas from the gas storage container 1 to the liquefied carbon dioxide storage tank 2. At the tip of the liquid recovery pipe 4, a gas recovery jig 6 that is attached to the container valve 5 of the gas storage container 1 and opens the container valve 5 is provided. In the system of this example, the tip of the liquid recovery pipe 4 is divided into a plurality of branch pipes 4a, 4b, 4c, 4d, 4e, and gas is added to the tip of each branch pipe 4a, 4b, 4c, 4d, 4e. A recovery jig 6 is provided so that a plurality of gas storage containers 1 can be connected at one time. In the gas recovery jig 6, the configuration is not particularly limited as long as the container valve 5 can be opened.

また、液化炭酸ガス貯留槽２は、液化炭酸ガス貯留槽２の内部を冷却する冷却手段７を備えている。この冷却手段７は、本例のシステムでは、液化炭酸ガス貯留槽２に冷却コイル８を内蔵し、冷却ガス貯蔵槽９から冷却ガス配管１０を介して冷却コイル８に液体窒素に代表される冷却ガスを送り込む構造となっている。   The liquefied carbon dioxide storage tank 2 includes a cooling means 7 that cools the inside of the liquefied carbon dioxide storage tank 2. In the system of this example, the cooling means 7 includes a cooling coil 8 built in the liquefied carbon dioxide storage tank 2, and a cooling represented by liquid nitrogen from the cooling gas storage tank 9 through the cooling gas pipe 10. It has a structure for sending gas.

さらに、ガス貯蔵容器１内の液化炭酸ガスが液化炭酸ガス貯留槽２に回収されたとみなすガス貯蔵容器１内の圧力を設定して、これを液化炭酸ガス回収みなし圧力Ｐ１とし、液化炭酸ガス貯留槽２内の圧力が、液化炭酸ガス回収みなし圧力Ｐ１を超えない範囲に制御する制御手段１１を備えている。この制御手段１１は、液化炭酸ガス貯留槽２内の圧力を検出する圧力センサ１２と、冷却ガス配管１０に設けた冷却操作弁１３と、圧力センサ１２で検出した液化炭酸ガス貯留槽２内の圧力により冷却操作弁１３を操作する制御部１４とで構成されている。
また、液化炭酸ガス貯留槽２には、目視できる圧力計１５と液面計１６が設けられている。 Furthermore, the pressure in the gas storage container 1 that the liquefied carbon dioxide gas in the gas storage container 1 is regarded as being recovered in the liquefied carbon dioxide storage tank 2 is set, and this is set as the liquefied carbon dioxide recovery assumed pressure P1, and the liquefied carbon dioxide gas storage Control means 11 is provided for controlling the pressure in the tank 2 so as not to exceed the liquefied carbon dioxide recovery pressure P1. The control means 11 includes a pressure sensor 12 for detecting the pressure in the liquefied carbon dioxide storage tank 2, a cooling operation valve 13 provided in the cooling gas pipe 10, and a liquefied carbon dioxide storage tank 2 detected by the pressure sensor 12. It is comprised with the control part 14 which operates the cooling operation valve 13 with a pressure.
The liquefied carbon dioxide gas storage tank 2 is provided with a pressure gauge 15 and a liquid level gauge 16 that can be visually observed.

ガス貯留槽３は、液化炭酸ガスが液化炭酸ガス貯留槽２に回収された後のガス或いは液化炭酸ガスが混合した残存ガスのあるガス貯蔵容器１ａとガス貯留槽３を接続し、ガス貯蔵容器１ａから残存ガスをガス貯留槽３に回収するガス回収配管１７を備えており、ガス回収配管１７の先端には、ガス貯蔵容器１ａの容器弁５に取り付けられ、容器弁５を開口するガス回収用治具６が設けられている。本例のシステムでは、ガス回収配管１７の先端が複数に分岐する分岐管１７ａ，１７ｂ，１７ｃ，１７ｄ，１７ｅとなっており、それぞれの分岐管１７ａ，１７ｂ，１７ｃ，１７ｄ，１７ｅの先端にガス回収用治具６が設けられており、一度に複数のガス貯蔵容器１ａが接続できるようになっている。
また、ガス貯留槽３には、目視できる圧力計１８が設けられている。 The gas storage tank 3 connects the gas storage container 3a with the gas after the liquefied carbon dioxide gas is collected in the liquefied carbon dioxide storage tank 2 or the residual gas mixed with the liquefied carbon dioxide gas and the gas storage tank 3, A gas recovery pipe 17 for recovering the residual gas from 1a to the gas storage tank 3 is provided, and a gas recovery pipe is attached to the container valve 5 of the gas storage container 1a at the tip of the gas recovery pipe 17 and opens the container valve 5. A working jig 6 is provided. In the system of this example, the tip of the gas recovery pipe 17 is branched into a plurality of branch pipes 17a, 17b, 17c, 17d, and 17e, and a gas is added to the tip of each branch pipe 17a, 17b, 17c, 17d, and 17e. A recovery jig 6 is provided so that a plurality of gas storage containers 1a can be connected at a time.
The gas storage tank 3 is provided with a visible pressure gauge 18.

また、液化炭酸ガス貯留槽２とガス貯留槽３は、ガス送り管１９で接続されており、そして、ガス貯留槽３内に回収した残存ガスを加圧して、液化炭酸ガスを回収した液化炭酸ガス貯留槽２に送り込む加圧ポンプ２０と、ガス貯留槽３内の圧力が０．００ＭＰａ（ゲージ圧）で加圧ポンプ２０をＯＦＦとし、０．００ＭＰａを超えた圧力となったらＯＮとする制御手段２１を備えている（実圧＝ゲージ圧＋大気圧となっており、以下、本文中の圧力は全てゲージ圧で表示する。）。この圧力は、本例では０．０１ＭＰａに設定されている。
本例のシステムでは、加圧ポンプ２０はブースターポンプが用いられている。また、制御手段２１は、ガス貯留槽３内の圧力を検出する圧力センサ２２と、圧力センサ２２で検出したガス貯留槽３内の圧力により加圧ポンプ２０をＯＮ・ＯＦＦする制御部２３とで構成されている。 In addition, the liquefied carbon dioxide storage tank 2 and the gas storage tank 3 are connected by a gas feed pipe 19, and the residual gas recovered in the gas storage tank 3 is pressurized to recover the liquefied carbon dioxide gas. Pressurizing pump 20 for feeding into gas storage tank 2 and control for turning off pressurizing pump 20 when the pressure in gas storage tank 3 is 0.00 MPa (gauge pressure) and turning on when the pressure exceeds 0.00 MPa. Means 21 are provided (actual pressure = gauge pressure + atmospheric pressure, hereinafter, all pressures in the text are indicated by gauge pressure). This pressure is set to 0.01 MPa in this example.
In the system of this example, the booster pump 20 is a booster pump. The control means 21 includes a pressure sensor 22 that detects the pressure in the gas storage tank 3 and a control unit 23 that turns the pressure pump 20 on and off by the pressure in the gas storage tank 3 detected by the pressure sensor 22. It is configured.

次に、上記した液化炭酸ガス回収システムにより実施する本発明に係る液化炭酸ガス回収方法を説明する。
［液化炭酸ガス回収工程］
先ず、計量器（図示せず）により液化炭酸ガスを貯蔵しているガス貯蔵容器１の重量を計測し、ガス貯蔵容器１に貯蔵されている液化炭酸ガス量を把握する。
ガス貯蔵容器１の重量を計測したら、ガス貯蔵容器１を液化炭酸ガス貯留槽２に接続する。この接続は、ガス貯蔵容器１の容器弁５に液回収配管４の先端に設けられているガス回収用治具６を取り付けることにより行う。このときの液化炭酸ガス貯留槽２内の圧力は、１．３ＭＰａ、ガス貯蔵容器１内の圧力は５．０ＭＰａ〜７．０ＭＰａとなっている。 Next, a liquefied carbon dioxide recovery method according to the present invention that is carried out by the above liquefied carbon dioxide recovery system will be described.
[Liquid carbon dioxide recovery process]
First, the weight of the gas storage container 1 storing liquefied carbon dioxide gas is measured by a measuring instrument (not shown), and the amount of liquefied carbon dioxide gas stored in the gas storage container 1 is grasped.
When the weight of the gas storage container 1 is measured, the gas storage container 1 is connected to the liquefied carbon dioxide gas storage tank 2. This connection is performed by attaching a gas recovery jig 6 provided at the tip of the liquid recovery pipe 4 to the container valve 5 of the gas storage container 1. At this time, the pressure in the liquefied carbon dioxide storage tank 2 is 1.3 MPa, and the pressure in the gas storage container 1 is 5.0 MPa to 7.0 MPa.

次に、ガス回収用治具６を操作してガス貯蔵容器１の容器弁５を開き、ガス貯蔵容器１内の圧力と液化炭酸ガス貯留槽２内の圧力との差圧を利用してガス貯蔵容器１内の液化炭酸ガスを液化炭酸ガス貯留槽２に回収する。
そして、ガス貯蔵容器１内と液化炭酸ガス貯留槽２内が同圧になった時点で液化炭酸ガス回収とみなし、ガス貯蔵容器１の容器弁５を閉じ、容器弁５からガス回収用治具６を外すことによりガス貯蔵容器１を液化炭酸ガス貯留槽２から分離する。 Next, the gas recovery jig 6 is operated to open the container valve 5 of the gas storage container 1, and gas is obtained using the pressure difference between the pressure in the gas storage container 1 and the pressure in the liquefied carbon dioxide storage tank 2. The liquefied carbon dioxide gas in the storage container 1 is recovered in the liquefied carbon dioxide gas storage tank 2.
Then, when the gas storage container 1 and the liquefied carbon dioxide storage tank 2 are at the same pressure, it is regarded as liquefied carbon dioxide recovery, the container valve 5 of the gas storage container 1 is closed, and the gas recovery jig from the container valve 5 is closed. By removing 6, the gas storage container 1 is separated from the liquefied carbon dioxide storage tank 2.

このときのガス貯蔵容器１内と液化炭酸ガス貯留槽２内の圧力Ｐ２は、ガス貯蔵容器１内の液化炭酸ガスが回収されたとみなされるガス貯蔵容器１内の圧力として予め設定された液化炭酸ガス回収みなし圧力Ｐ１を超えない範囲内の圧力であり、圧力Ｐ２が圧力Ｐ１に達するまでは、新たなガス貯蔵容器１を液化炭酸ガス貯留槽２に接続し、液化炭酸ガスの回収を行う。
本例では、液化炭酸ガス回収みなし圧力Ｐ１は１．３ＭＰａ〜１．５ＭＰａの範囲で設定している。 The pressure P2 in the gas storage container 1 and the liquefied carbon dioxide storage tank 2 at this time is a liquefied carbon dioxide set in advance as the pressure in the gas storage container 1 that is regarded as the recovery of the liquefied carbon dioxide gas in the gas storage container 1 Until the pressure P2 reaches the pressure P1, the new gas storage container 1 is connected to the liquefied carbon dioxide storage tank 2 and the liquefied carbon dioxide is recovered until the pressure P2 reaches the pressure P1.
In this example, the liquefied carbon dioxide recovery assumed pressure P1 is set in the range of 1.3 MPa to 1.5 MPa.

また、本例では、液化炭酸ガス貯留槽２内の圧力を圧力センサ１２で検出し、冷却操作弁１３を操作して液化炭酸ガスの回収により上昇した液化炭酸ガス貯留槽２内を冷却し、液化炭酸ガス貯留槽２内の圧力を下げることにより、液化炭酸ガス貯留槽２における液化炭酸ガスの回収量を増加させ、そして、液化炭酸ガス貯留槽２内の圧力を、液化炭酸ガス回収みなし圧力Ｐ１を超えない範囲に維持するように制御することにより、ガス貯蔵容器１内の液化炭酸ガスの回収効果を確実なものとしている。   Further, in this example, the pressure in the liquefied carbon dioxide storage tank 2 is detected by the pressure sensor 12, and the cooling operation valve 13 is operated to cool the liquefied carbon dioxide storage tank 2 raised by the recovery of the liquefied carbon dioxide gas. By reducing the pressure in the liquefied carbon dioxide storage tank 2, the amount of liquefied carbon dioxide recovered in the liquefied carbon dioxide storage tank 2 is increased, and the pressure in the liquefied carbon dioxide storage tank 2 is regarded as the liquefied carbon dioxide recovery pressure. By controlling to maintain within the range not exceeding P1, the recovery effect of the liquefied carbon dioxide gas in the gas storage container 1 is ensured.

次に、液化炭酸ガス貯留槽２からガス貯蔵容器１ａを分離したら、液化炭酸ガス回収後のガス貯蔵容器１の重量を計量器で計測し、液化炭酸ガス量の回収率を算出し、液化炭酸ガス量の回収量を把握する。   Next, after separating the gas storage container 1a from the liquefied carbon dioxide storage tank 2, the weight of the gas storage container 1 after the recovery of the liquefied carbon dioxide gas is measured with a measuring instrument, and the recovery rate of the liquefied carbon dioxide amount is calculated. Know the amount of gas recovered.

［残存ガス回収工程］
先ず、前工程で液化炭酸ガス貯留槽２から分離した液化炭酸ガスが回収されたガス貯蔵容器１ａをガス貯留槽３に接続する。この接続は、ガス貯蔵容器１ａの容器弁５にガス回収配管１７の先端に設けられているガス回収用治具６を取り付けることにより行う。このときのガス貯留槽３内の圧力は、０．００ＭＰａとなっている。 [Residual gas recovery process]
First, the gas storage container 1 a from which the liquefied carbon dioxide gas separated from the liquefied carbon dioxide storage tank 2 in the previous step is recovered is connected to the gas storage tank 3. This connection is made by attaching a gas recovery jig 6 provided at the tip of the gas recovery pipe 17 to the container valve 5 of the gas storage container 1a. The pressure in the gas storage tank 3 at this time is 0.00 MPa.

次に、ガス回収用治具６を操作してガス貯蔵容器１ａの容器弁５を開き、ガス貯蔵容器１ａ内の圧力（１．３ＭＰａ〜１．５ＭＰａ）とガス貯留槽３内の圧力との差圧を利用してガス貯蔵容器１ａ内に残存するガス或いはガスと液化炭酸ガスが混合した残存ガスをガス貯留槽３に回収する。
そして、ガス貯蔵容器１ａ内とガス貯留槽３内が同圧になった時点で残存ガス回収とみなし、容器弁５からガス回収用治具６を外すことによりガス貯蔵容器１ａをガス貯留槽３から分離する。 Next, the gas recovery jig 6 is operated to open the container valve 5 of the gas storage container 1a, and the pressure in the gas storage container 1a (1.3 MPa to 1.5 MPa) and the pressure in the gas storage tank 3 are Using the differential pressure, the gas remaining in the gas storage container 1 a or the residual gas in which the gas and the liquefied carbon dioxide gas are mixed is recovered in the gas storage tank 3.
Then, when the inside of the gas storage container 1a and the inside of the gas storage tank 3 become the same pressure, it is considered that the residual gas is recovered, and the gas storage container 1a is removed from the container valve 5 by removing the gas recovery jig 6. Separate from.

このときのガス貯蔵容器１ａ内とガス貯留槽３内の圧力Ｐ３は、ガス貯蔵容器１ａ内の残存ガスが回収されたとみなされるガス貯蔵容器１ａ内の圧力として予め設定された残存ガス回収みなし圧力Ｐ４を超えない範囲内の圧力であり、圧力Ｐ３が圧力Ｐ４に達するまでは、新たな液化炭酸ガスが回収されたガス貯蔵容器１ａをガス貯留槽３に接続し、残存ガスの回収を行う。
本例では、残存ガス回収みなし圧力Ｐ４は０．０３ＭＰａ〜０．０５ＭＰａの範囲で設定している。
この工程は、次に説明する残存ガス液化工程と並行して行う。 The pressure P3 in the gas storage container 1a and the gas storage tank 3 at this time is a residual gas recovery assumed pressure set in advance as a pressure in the gas storage container 1a in which the residual gas in the gas storage container 1a is considered recovered. Until the pressure P3 reaches the pressure P4, the pressure is within a range that does not exceed P4. The gas storage container 1a from which new liquefied carbon dioxide gas has been recovered is connected to the gas storage tank 3, and the remaining gas is recovered.
In this example, the residual gas recovery pressure P4 is set in the range of 0.03 MPa to 0.05 MPa.
This step is performed in parallel with the residual gas liquefaction step described below.

［残存ガス液化工程］
前記残存ガス回収工程で、ガス貯蔵容器１ａ内の残存ガスの回収によりガス貯留槽３内の圧力が上昇し０．０１ＭＰａを超えたら、加圧ポンプ２０を起動させ、ガス貯留槽３内に回収した残存ガスを加圧して、加圧した残存ガスをガス送り管１９を介して液化炭酸ガス回収工程で液化炭酸ガスを回収した液化炭酸ガス貯留槽２に送り込む。
このときの加圧ポンプ２０による残存ガスの加圧は、液化炭酸ガス貯留槽２に送り込まれた残存ガスが液化炭酸ガス貯留槽２内の液化炭酸ガスで冷却されて液化するのに要する加圧であることが求められ、本例では２ＭＰに加圧している。 [Residual gas liquefaction process]
In the residual gas recovery step, when the pressure in the gas storage tank 3 rises due to recovery of the residual gas in the gas storage container 1a and exceeds 0.01 MPa, the pressurization pump 20 is started and recovered in the gas storage tank 3 The residual gas thus pressurized is pressurized, and the pressurized residual gas is fed into the liquefied carbon dioxide gas storage tank 2 from which the liquefied carbon dioxide gas has been recovered in the liquefied carbon dioxide gas recovery step via the gas feed pipe 19.
The pressurization of the residual gas by the pressurization pump 20 at this time is a pressurization required for the residual gas sent into the liquefied carbon dioxide storage tank 2 to be cooled and liquefied by the liquefied carbon dioxide gas in the liquefied carbon dioxide storage tank 2. In this example, the pressure is increased to 2MP.

そして、加圧ポンプ２０によりガス貯留槽３内に回収した残存ガスを加圧して液化炭酸ガス貯留槽２に送り込んでもガス貯留槽３内の圧力が上昇し、残存ガス回収みなし圧力Ｐ４を超えた場合は、ガス貯蔵容器１ａ内とガス貯留槽３内が同圧になってもガス貯蔵容器１ａをガス貯留槽３から分離せず、加圧ポンプ２０の起動を続け、ガス貯留槽３内の圧力が下がり、残存ガス回収みなし圧力Ｐ４以下となり、残存ガス回収みなし圧力Ｐ４以下でガス貯蔵容器１ａ内とガス貯留槽３内が同圧になったとき、ガス貯蔵容器１ａをガス貯留槽３から分離する。   And even if it pressurizes the residual gas collect | recovered in the gas storage tank 3 with the pressurization pump 20, and sends it to the liquefied carbon dioxide storage tank 2, the pressure in the gas storage tank 3 will rise and exceeded the residual gas recovery pressure P4 In such a case, the gas storage container 1a is not separated from the gas storage tank 3 even if the gas storage container 1a and the gas storage tank 3 have the same pressure, and the activation of the pressurizing pump 20 is continued. When the pressure decreases and becomes a residual gas recovery pressure P4 or less, and the residual gas recovery pressure P4 or less and the gas storage container 1a and the gas storage tank 3 have the same pressure, the gas storage container 1a is removed from the gas storage tank 3. To separate.

以上の工程を経てガス貯蔵容器１ａをガス貯留槽３から分離することにより、液化炭酸ガスを貯蔵するガス貯蔵容器１からの液化炭酸ガスの回収が完了する。   By separating the gas storage container 1a from the gas storage tank 3 through the above steps, the recovery of the liquefied carbon dioxide from the gas storage container 1 for storing the liquefied carbon dioxide gas is completed.

以上のように構成した本発明に係る液化炭酸ガス回収方法によれば、液化炭酸ガスを貯蔵しているガス貯蔵容器１を、内圧が１．３ＭＰａとなっている液化炭酸ガス貯留槽２に接続し、ガス貯蔵容器１の容器弁５を開くことにより、ガス貯蔵容器内の圧力と液化炭酸ガス貯留槽内の圧力との差圧でガス貯蔵容器１内の液化炭酸ガスが液化炭酸ガス貯留槽２に流れるので、液化炭酸ガスを液化炭酸ガス貯留槽２に容易に回収することができる。
そして、ガス貯蔵容器１内と液化炭酸ガス貯留槽２内が同圧Ｐ２となった時点で液化炭酸ガス回収とみなすので、ガス貯蔵容器から所定量の液化炭酸ガスを確実に回収することができる。 According to the liquefied carbon dioxide gas recovery method according to the present invention configured as described above, the gas storage container 1 storing liquefied carbon dioxide gas is connected to the liquefied carbon dioxide gas storage tank 2 having an internal pressure of 1.3 MPa. Then, by opening the container valve 5 of the gas storage container 1, the liquefied carbon dioxide gas in the gas storage container 1 is converted into the liquefied carbon dioxide storage tank by the differential pressure between the pressure in the gas storage container and the pressure in the liquefied carbon dioxide storage tank. 2, the liquefied carbon dioxide gas can be easily recovered in the liquefied carbon dioxide gas storage tank 2.
And since it is considered as liquefied carbon dioxide gas recovery when the inside of the gas storage container 1 and the liquefied carbon dioxide gas storage tank 2 become the same pressure P2, a predetermined amount of liquefied carbon dioxide gas can be reliably recovered from the gas storage container. .

本例では、ガス貯蔵容器１内の液化炭酸ガスが回収されたとみなされるガス貯蔵容器１内の圧力として予め１．３ＭＰａ〜１．５ＭＰａと設定し、この圧力を液化炭酸ガス回収みなし圧力Ｐ１とし、同圧Ｐ２は、液化炭酸ガス回収みなし圧力Ｐ１を超えない範囲内の圧力としたので、ガス貯蔵容器１に貯蔵された液化炭酸ガスの大半を確実に回収することができる。   In this example, 1.3 MPa to 1.5 MPa is set in advance as the pressure in the gas storage container 1 in which the liquefied carbon dioxide gas in the gas storage container 1 is considered recovered, and this pressure is set as the liquefied carbon dioxide recovery assumed pressure P1. Since the same pressure P2 is set to a pressure that does not exceed the liquefied carbon dioxide recovery pressure P1, the majority of the liquefied carbon dioxide stored in the gas storage container 1 can be reliably recovered.

また、本例では、液化炭酸ガス貯留槽２内の圧力を圧力センサ１２で検出し、冷却操作弁１３を操作して液化炭酸ガスの回収により上昇した液化炭酸ガス貯留槽２内を冷却し、液化炭酸ガス貯留槽２内の圧力を下げることにより、液化炭酸ガス貯留槽２における液化炭酸ガスの回収量を増加させることができ、そして、液化炭酸ガス貯留槽２内の圧力を、液化炭酸ガス回収みなし圧力Ｐ１を超えない範囲を維持するように制御するので、ガス貯蔵容器１内の液化炭酸ガスの回収効果を確実なものとしている。   Further, in this example, the pressure in the liquefied carbon dioxide storage tank 2 is detected by the pressure sensor 12, and the cooling operation valve 13 is operated to cool the liquefied carbon dioxide storage tank 2 raised by the recovery of the liquefied carbon dioxide gas. By reducing the pressure in the liquefied carbon dioxide storage tank 2, the amount of liquefied carbon dioxide recovered in the liquefied carbon dioxide storage tank 2 can be increased, and the pressure in the liquefied carbon dioxide storage tank 2 is changed to the liquefied carbon dioxide gas. Since the control is performed so as to maintain the range not exceeding the recovery pressure P1, the recovery effect of the liquefied carbon dioxide gas in the gas storage container 1 is ensured.

そして、ガス貯蔵容器１内と液化炭酸ガス貯留槽２内が同圧Ｐ２となった時点で、ガス貯蔵容器１の容器弁５を閉じ、ガス貯蔵容器１を液化炭酸ガス貯留槽２から分離し、そして、液化炭酸ガスを回収したガス貯蔵容器１ａを、内圧が０．００ＭＰａとなっているガス貯留槽３に接続し、ガス貯蔵容器１ａの容器弁５を開くことにより、ガス貯蔵容器１ａ内の圧力とガス貯留槽３内の圧力との差圧でガス貯蔵容器１ａ内の残存ガスがガス貯留槽３に流れるので、残存ガスをガス貯留槽３に容易に回収することができる。
そして、ガス貯蔵容器１ａ内とガス貯留槽３内が同圧Ｐ３となった時点でガス回収とみなすので、ガス貯蔵容器１ａから所定量の残存ガスを確実に回収することができる。 When the gas storage container 1 and the liquefied carbon dioxide storage tank 2 reach the same pressure P2, the container valve 5 of the gas storage container 1 is closed and the gas storage container 1 is separated from the liquefied carbon dioxide storage tank 2. And the gas storage container 1a which collect | recovered liquefied carbon dioxide gas is connected to the gas storage tank 3 whose internal pressure is set to 0.00MPa, and the container valve 5 of the gas storage container 1a is opened, The gas storage container 1a Since the residual gas in the gas storage container 1a flows into the gas storage tank 3 with a differential pressure between the pressure in the gas storage tank 3 and the pressure in the gas storage tank 3, the residual gas can be easily recovered in the gas storage tank 3.
And since it is considered as gas recovery when the inside of the gas storage container 1a and the inside of the gas storage tank 3 become the same pressure P3, a predetermined amount of residual gas can be reliably recovered from the gas storage container 1a.

本例では、ガス貯蔵容器１ａ内の残存ガスが回収されたとみなされるガス貯蔵容器１ａ内の圧力として予め０．０３ＭＰａ〜０．０５ＭＰａと設定し、この圧力を残存ガス回収みなし圧力Ｐ４とし、同圧Ｐ３は、ガス回収みなし圧力Ｐ４を超えない範囲内の圧力としたので、ガス貯蔵容器ａ１に残存する残存ガスの殆どを確実に回収することができる。   In this example, the pressure in the gas storage container 1a considered that the residual gas in the gas storage container 1a is recovered is set in advance as 0.03 MPa to 0.05 MPa, and this pressure is set as the residual gas recovery assumed pressure P4. Since the pressure P3 is set to a pressure that does not exceed the assumed gas recovery pressure P4, most of the residual gas remaining in the gas storage container a1 can be reliably recovered.

さらに、本例では、ガス貯蔵容器１ａ内の残存ガスの回収によりガス貯留槽３内の圧力が上昇し０．０１ＭＰａを超えたら、加圧ポンプ２０を起動させ、ガス貯留槽３内に回収した残存ガスを加圧して液化炭酸ガス回収工程で液化炭酸ガスを回収した液化炭酸ガス貯留槽２に送り込むので、液化炭酸ガス貯留槽２に送り込まれた残存ガスは液化炭酸ガス貯留槽２内の冷却されている液化炭酸ガスで冷却されて液化される。   Further, in this example, when the pressure in the gas storage tank 3 rises due to the recovery of the residual gas in the gas storage container 1a and exceeds 0.01 MPa, the pressurizing pump 20 is started and recovered in the gas storage tank 3. Since the residual gas is pressurized and sent to the liquefied carbon dioxide storage tank 2 that has recovered the liquefied carbon dioxide gas in the liquefied carbon dioxide recovery step, the residual gas sent to the liquefied carbon dioxide storage tank 2 is cooled in the liquefied carbon dioxide storage tank 2. It is cooled and liquefied with the liquefied carbon dioxide gas.

このようにして、ガス貯蔵容器１内の液化炭酸ガスの殆どを液化炭酸ガス貯留槽２に確実に回収することができる。   In this way, most of the liquefied carbon dioxide in the gas storage container 1 can be reliably recovered in the liquefied carbon dioxide storage tank 2.

１，１ａ ガス貯蔵容器
２ 液化炭酸ガス貯留槽
３ ガス貯留槽
４ 液回収配管
４ａ，４ｂ，４ｃ，４ｄ，４ｅ 分岐管
５ 容器弁
６ ガス回収用治具
７ 冷却手段
８ 冷却コイル
９ 冷却ガス貯蔵槽
１０ 冷却ガス配管
１１ 制御手段
１２ 圧力センサ
１３ 冷却操作弁
１４ 制御部
１５ 圧力計
１６ 液面計
１７ ガス回収配管
１７ａ，１７ｂ，１７ｃ，１７ｄ，１７ｅ 分岐管
１８ 圧力計
１９ ガス送り管
２０ 加圧ポンプ
２１ 制御手段
２２ 圧力センサ
２３ 制御部 DESCRIPTION OF SYMBOLS 1,1a Gas storage container 2 Liquefied carbon dioxide storage tank 3 Gas storage tank 4 Liquid recovery piping 4a, 4b, 4c, 4d, 4e Branch pipe 5 Container valve 6 Gas recovery jig 7 Cooling means 8 Cooling coil 9 Cooling gas storage Tank 10 Cooling gas piping 11 Control means 12 Pressure sensor 13 Cooling operation valve 14 Control unit 15 Pressure gauge 16 Liquid level gauge 17 Gas recovery piping 17a, 17b, 17c, 17d, 17e Branch pipe 18 Pressure gauge 19 Gas feed pipe 20 Pressurization Pump 21 Control means 22 Pressure sensor 23 Control unit

Claims (4)

液化炭酸ガスを貯蔵するガス貯蔵容器から液化炭酸ガスを回収する液化炭酸ガス回収方法であって、
液化炭酸ガスを貯蔵している前記ガス貯蔵容器を液化炭酸ガス貯留槽に接続し、前記ガス貯蔵容器の容器弁を開き前記ガス貯蔵容器内の圧力と前記液化炭酸ガス貯留槽内の圧力との差圧を利用して前記ガス貯蔵容器内の液化炭酸ガスを前記液化炭酸ガス貯留槽に回収し、前記ガス貯蔵容器内と前記液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなし、前記ガス貯蔵容器の前記容器弁を閉じ、前記ガス貯蔵容器を前記液化記炭酸ガス貯留槽から分離する液化炭酸ガス回収工程と、
前工程で前記液化炭酸ガス貯留槽から分離した前記ガス貯蔵容器をガス貯留槽に接続し、前記ガス貯蔵容器の容器弁を開き前記ガス貯蔵容器内の圧力と前記ガス貯留槽内の圧力との差圧を利用して前記ガス貯蔵容器内に残存するガス或いはガスと液化炭酸ガスが混合した残存ガスを前記ガス貯留槽に回収し、前記ガス貯蔵容器内と前記ガス貯留槽内が同圧になった時点で残存ガス回収とみなし、前記ガス貯蔵容器と前記ガス貯留槽を分離する残存ガス回収工程と、
前記ガス貯留槽内に回収した残存ガスを加圧して、前記液化炭酸ガスを回収した前記液化炭酸ガス貯留槽に送り込む残存ガス液化工程を含み、
前記液化炭酸ガス貯留槽は内部を冷却する冷却手段を備えており、前記ガス貯蔵容器からの液化炭酸ガスの回収中に、前記液化炭酸ガス貯留槽内を冷却して前記液化炭酸ガス貯留槽内の圧力が液化炭酸ガス回収みなし圧力を超えない範囲に制御することを特徴とする液化炭酸ガス回収方法。 A liquefied carbon dioxide recovery method for recovering liquefied carbon dioxide from a gas storage container for storing liquefied carbon dioxide,
Said gas storage vessel that stores liquefied carbon dioxide connected to the liquefied carbon dioxide storage tank, the pressure and the pressure of the liquefied carbon dioxide storage tank in the gas storage vessel to open the container valve of the gas storage vessel utilizing the pressure difference recovered liquefied carbon dioxide of the gas storage vessel to the liquefied carbon dioxide storage tank, the liquefied carbon dioxide at the time the liquefied carbon dioxide storage tank and the gas storage vessel became the same pressure recovery and regarded, closing the container valve of the gas storage container, a step liquefied carbon dioxide recovery for separating the gas reservoir from the liquefied SL carbon dioxide storage tank,
Before the gas reservoir separated from the liquefied carbon dioxide storage tank in the process connected to the gas reservoir, the pressure in the pressure between the gas storage tank in the gas storage vessel to open the container valve of the gas storage vessel utilizing the differential pressure to recover the residual gas mixed gas or gas and liquefied carbon dioxide remaining within the gas storage vessel to the gas storage tank, in the gas storage tank and the gas storage vessel the pressure when it was regarded as residual gas recovery, and the residual gas recovery step of separating said gas reservoir and the gas reservoir,
The residual gas collected in the gas storage tank is pressurized, including residual gas liquefaction process wherein feeding the liquefied carbon dioxide in the liquefied carbon dioxide storage tank recovered,
The liquefied carbon dioxide storage tank includes a cooling means for cooling the inside, and during the recovery of the liquefied carbon dioxide gas from the gas storage container, the inside of the liquefied carbon dioxide storage tank is cooled to The liquefied carbon dioxide recovery method is characterized in that the pressure is controlled so as not to exceed the liquefied carbon dioxide recovery assumed pressure . 前記ガス貯蔵容器内と前記液化炭酸ガス貯留槽内が同圧になった時点で液化炭酸ガス回収とみなす前記液化炭酸ガス貯留槽内の圧力は、前記ガス貯蔵容器内の液化炭酸ガスが回収されたとみなされる前記ガス貯蔵容器内の圧力として予め設定された液化炭酸ガス回収みなし圧力を超えない範囲内の圧力であり、
前記ガス貯蔵容器内と前記ガス貯留槽内が同圧になった時点で残存ガス回収とみなす前記ガス貯留槽内の圧力は、前記ガス貯蔵容器内の残存ガスが回収されたとみなされる前記ガス貯蔵容器内の圧力として予め設定された残存ガス回収みなし圧力を超えない範囲内の圧力であることを特徴とする請求項１に記載の液化炭酸ガス回収方法。 The pressure of the liquefied carbon dioxide storage tank that the gas storage in said liquefied carbon dioxide storage tank container regarded as liquefied carbon dioxide recovery as they become the same pressure, liquefied carbon dioxide of the gas storage container is recovered a pressure within the range not exceeding the preset liquefied carbon dioxide recovered regarded pressure as the pressure of the gas storage vessel is deemed,
The pressure of the gas storage tank to the gas storage in said gas reservoir vessel considered as residual gas recovery as they become the same pressure, the gas storage the residual gas in the gas storage vessel is considered to have been recovered 2. The liquefied carbon dioxide recovery method according to claim 1, wherein the pressure is within a range not exceeding a presumed residual gas recovery pressure set as the pressure in the container. 前記残存ガス回収工程と前記残存ガス液化工程とは並行して行うことを特徴とする請求項１または２のいずれか１に記載の液化炭酸ガス回収方法。 The liquefied carbon dioxide recovery method according to any one of claims 1 and 2, wherein the residual gas recovery step and the residual gas liquefaction step are performed in parallel . 前記液化炭酸ガス貯留槽に備えた前記冷却手段は、前記液化炭酸ガス貯留槽に冷却コイルを内蔵し，前記冷却コイルに冷却ガスを送り込み、前記液化炭酸ガス貯留槽の内部を冷却するものであることを特徴とする請求項１から３までのいずれか１に記載の液化炭酸ガス回収方法。 The cooling means provided in the liquefied carbon dioxide storage tank incorporates a cooling coil in the liquefied carbon dioxide storage tank, feeds a cooling gas into the cooling coil, and cools the inside of the liquefied carbon dioxide storage tank. The method for recovering liquefied carbon dioxide according to any one of claims 1 to 3, wherein:
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