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JP7608985B2 - Evaporative gas treatment method and evaporative gas treatment system - Google Patents
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JP7608985B2 - Evaporative gas treatment method and evaporative gas treatment system - Google Patents

Evaporative gas treatment method and evaporative gas treatment system Download PDF

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JP7608985B2
JP7608985B2 JP2021108286A JP2021108286A JP7608985B2 JP 7608985 B2 JP7608985 B2 JP 7608985B2 JP 2021108286 A JP2021108286 A JP 2021108286A JP 2021108286 A JP2021108286 A JP 2021108286A JP 7608985 B2 JP7608985 B2 JP 7608985B2
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治貴 浦部
真 土居
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本発明は、液化天然ガスをはじめとする低温液体が貯留された貯槽内で発生する蒸発ガスを処理する蒸発ガス処理方法及び蒸発ガス処理システムに関するものである。 The present invention relates to an evaporation gas processing method and an evaporation gas processing system for processing evaporation gas generated in a storage tank that stores low-temperature liquids such as liquefied natural gas.

都市ガス製造の原料である天然ガス(NG)は、日本国内においては液化天然ガス(LNG)として輸入、貯蔵される。LNGを始めとする低温液体の貯蔵には断熱材等で断熱されたタンクが用いられるが、タンクへの入熱により低温液体の一部が蒸発し、タンク内に蒸発ガス(BOG)が発生する。この蒸発ガスによってタンクの内圧が上昇すると、タンクの破損、及び、それに伴うガス漏れや爆発事故の危険性がある。これを防ぐため、蒸発ガスを何らかの方法によりタンク内から除去する必要がある。 Natural gas (NG), the raw material for producing city gas, is imported and stored in Japan as liquefied natural gas (LNG). Tanks insulated with insulating materials are used to store low-temperature liquids such as LNG, but when heat enters the tank, some of the low-temperature liquid evaporates, generating boil-off gas (BOG) inside the tank. If this boil-off gas increases the internal pressure of the tank, there is a risk of the tank being damaged and resulting gas leaks and explosions. To prevent this, it is necessary to remove the boil-off gas from the tank in some way.

蒸発ガスをタンク内から除去する方法として、もっとも簡単な方法はタンク外への放出であるが、天然ガスのように蒸発ガスが可燃性や有毒性を有する場合、大気中に放出することは好ましくない。また、蒸発ガスが可燃性を有する場合にはフレアパージという手段もあるが、これも原料の有効利用や大気汚染の観点から好ましくない。
そのため、蒸発ガスを有効利用する処理方法として、タンクから回収した蒸発ガスをガス送出パイプラインのガスに導入する、あるいは、ガス送出パイプラインにおける気化前のLNGに導入して再液化させるといった処理が一般的に行われている。この場合、貯蔵タンクの蒸発ガスの圧力はガス送出パイプラインの圧力よりも低いので、ガス送出パイプラインに導入する前にガスコンプレッサーなどを用いて蒸発ガスを昇圧する必要がある。
The simplest method for removing evaporated gas from inside a tank is to release it outside the tank, but if the evaporated gas is flammable or toxic, such as in the case of natural gas, it is not desirable to release it into the atmosphere. In addition, if the evaporated gas is flammable, there is also a method called flare purging, but this is also undesirable from the viewpoint of efficient use of raw materials and air pollution.
Therefore, as a method for effectively utilizing the evaporated gas, the evaporated gas recovered from the tank is generally introduced into the gas in the gas delivery pipeline, or into the LNG before vaporization in the gas delivery pipeline to be re-liquefied. In this case, since the pressure of the evaporated gas in the storage tank is lower than the pressure in the gas delivery pipeline, it is necessary to increase the pressure of the evaporated gas using a gas compressor or the like before introducing it into the gas delivery pipeline.

特許文献1には、蒸発ガスを効率よく処理する方法として、タンク内の液化ガスの一部を別のタンク内(以下、「冷却タンク」という)に補給し、その冷却タンク内に吸着材を充填した容器(以下、「吸着容器」という)を沈めることで吸着材を冷却し、その冷却された吸着材に蒸発ガスを吸着させた後、吸着容器を加熱して蒸発ガスを脱離・昇圧してガス送出パイプラインへ導入する、という技術が開示されている。
特許文献1の方法は、吸着材が低温になるほどガス吸着量が増大するという性質を利用したものであり、低温状態で蒸発ガスを吸着させた後に吸着容器を加熱して、蒸発ガスを脱離させると共に容器内の圧力を上昇させ、ガスコンプレッサー等で昇圧することなく蒸発ガスをガス送出パイプラインへ送出できるようにしている。
Patent Document 1 discloses a technology for efficiently treating evaporated gas, in which some of the liquefied gas in a tank is replenished into another tank (hereinafter referred to as the "cooling tank"), a container filled with an adsorbent (hereinafter referred to as the "adsorption vessel") is submerged in the cooling tank to cool the adsorbent, the evaporated gas is adsorbed onto the cooled adsorbent, and the adsorption vessel is then heated to desorb and pressurize the evaporated gas before being introduced into a gas delivery pipeline.
The method of Patent Document 1 utilizes the property that the lower the temperature of the adsorbent, the greater the amount of gas adsorbed. After adsorbing the evaporated gas at a low temperature, the adsorption vessel is heated to desorb the evaporated gas and increase the pressure inside the vessel, allowing the evaporated gas to be sent to a gas delivery pipeline without increasing the pressure using a gas compressor or the like.

特許第4885465号公報Patent No. 4885465

上述のように、特許文献1の方法は、吸着容器を冷却して蒸発ガスを吸着回収し、その後吸着容器を加熱することで蒸発ガスを脱着し、脱着によって昇圧した蒸発ガス(以下、「脱着ガス」という)をガス送出パイプラインへ導入するものであった。この場合、脱着が進行して吸着容器内の蒸発ガス量が減少すると、それに伴って脱着ガスの圧力が徐々に低下する。脱着ガスの圧力がガス送出パイプラインの圧力以下になると、ガス送出パイプラインに脱着ガスを導入できなくなるので、所定量排出したところで、脱着ガスの排出を停止する。 As described above, the method of Patent Document 1 involves cooling the adsorption vessel to adsorb and recover the evaporated gas, then heating the adsorption vessel to desorb the evaporated gas, and introducing the evaporated gas pressurized by desorption (hereinafter referred to as "desorbed gas") into the gas delivery pipeline. In this case, as the amount of evaporated gas in the adsorption vessel decreases as the desorption progresses, the pressure of the desorbed gas gradually decreases accordingly. When the pressure of the desorbed gas falls below the pressure of the gas delivery pipeline, it is no longer possible to introduce the desorbed gas into the gas delivery pipeline, so the discharge of the desorbed gas is stopped when a predetermined amount has been discharged.

脱着ガスの排出を停止した吸着容器には、ガス送出パイプラインの圧力と同程度の圧力の蒸発ガスが残存しているので(以下、これを「残ガス」という)、新たにLNGタンクから蒸発ガスを回収するためには、吸着容器内の残ガスを処理してLNGタンクの内圧と同程度になるまで減圧する必要がある。 When the discharge of desorbed gas has stopped, evaporated gas remains in the adsorption vessel at a pressure equivalent to that of the gas delivery pipeline (hereinafter referred to as "residual gas"). In order to recover evaporated gas from the LNG tank again, it is necessary to process the remaining gas in the adsorption vessel and reduce the pressure to the same level as the internal pressure of the LNG tank.

この点、特許文献1は、冷却タンクにLNGを再補給することで吸着容器が再冷却されるので、残ガスが吸着材に吸着して減圧されるものの、吸着容器の再冷却の際には冷却タンクに補給されたLNGが蒸発して新たな蒸発ガスが冷却タンク内で発生するので、蒸発ガスの処理効率が低下するという問題があった。 In this regard, in Patent Document 1, the adsorption vessel is recooled by re-supplying LNG to the cooling tank, so that the residual gas is adsorbed by the adsorbent and reduced in pressure. However, when the adsorption vessel is re-cooled, the LNG supplied to the cooling tank evaporates, generating new evaporated gas in the cooling tank, which causes a problem of reduced efficiency in the treatment of evaporated gas.

本発明は、係る課題を解決するためになされたものであり、蒸発ガスの処理効率を低下させることなく残ガスを処理することができ、効率的に蒸発ガスを処理できる蒸発ガス処理方法及び蒸発ガス処理システムを提供することを目的とする。 The present invention has been made to solve the above problems, and aims to provide an evaporated gas processing method and evaporated gas processing system that can process residual gas without reducing the efficiency of evaporative gas processing and can efficiently process evaporated gas.

(1)本発明に係る蒸発ガス処理方法は、低温液体が貯留された貯槽から発生する蒸発ガスを抜き出す抜き出しラインと、前記蒸発ガスを吸着する吸着材が収容された二つの吸着容器と、前記貯槽から低温液体を送出する送出ポンプと、該送出ポンプによって送出された低温液体が流れる低温液体送出ラインと、該低温液体送出ラインに設けられて前記低温液体の冷熱を利用して熱交換する熱交換器と、該熱交換器及び前記二つの吸着容器と接続され、前記抜き出しラインから抜き出された蒸発ガスを導入して前記二つの吸着容器のうち一つと前記熱交換器との間で循環させる循環ラインとを備えた蒸発ガス処理システムを用いて前記蒸発ガスを処理する方法であって、前記吸着容器のそれぞれにおいて、前記循環ラインを通流する蒸発ガスを前記吸着材に吸着させる吸着処理と、該吸着処理で吸着した蒸発ガスを加熱して前記吸着材から脱着させ、該脱着により昇圧した蒸発ガスを前記低温液体送出ライン又は前記貯槽内の圧力よりも高圧の系に導入する脱着処理と、該脱着処理の後、吸着容器に残った残ガスを前記循環ラインに排出して吸着容器内を減圧する残ガス処理とを行うこととし、前記二つの吸着容器で前記吸着処理を交互に行うことで前記貯槽から連続的に蒸発ガスを抜き出し、かつ、一方の吸着容器で前記吸着処理を行う間に他方の吸着容器で前記脱着処理及び前記残ガス処理を行うことで前記他方の吸着容器の残ガスを吸着処理中の前記一方の吸着容器に前記循環ラインを介して導入するようにしたことを特徴とするものである。 (1) The evaporative gas treatment method of the present invention is a method for treating the evaporative gas using an evaporative gas treatment system including an extraction line for extracting the evaporative gas generated from a storage tank in which a cryogenic liquid is stored, two adsorption vessels containing an adsorbent that adsorbs the evaporative gas, an output pump for sending out the cryogenic liquid from the storage tank, a cryogenic liquid output line through which the cryogenic liquid sent out by the output pump flows, a heat exchanger provided in the cryogenic liquid output line for heat exchange using the cold heat of the cryogenic liquid, and a circulation line connected to the heat exchanger and the two adsorption vessels, which introduces the evaporative gas extracted from the extraction line and circulates it between one of the two adsorption vessels and the heat exchanger, and in each of the adsorption vessels, The system includes an adsorption process in which the evaporative gas flowing through the adsorbent is adsorbed, a desorption process in which the evaporative gas adsorbed in the adsorption process is heated to desorb from the adsorbent and the evaporative gas pressurized by the desorption is introduced into a system having a higher pressure than the low-temperature liquid delivery line or the pressure in the storage tank, and a residual gas process in which the residual gas remaining in the adsorption vessel after the desorption process is discharged into the circulation line to reduce the pressure inside the adsorption vessel. The system is characterized in that the adsorption process is alternately performed in the two adsorption vessels to continuously extract the evaporative gas from the storage tank, and while the adsorption process is being performed in one adsorption vessel, the desorption process and the residual gas process are performed in the other adsorption vessel, so that the residual gas in the other adsorption vessel is introduced through the circulation line into the one adsorption vessel undergoing the adsorption process.

(2)また、本発明に係る蒸発ガス処理システムは、低温液体が貯留された貯槽から発生する蒸発ガスを処理するものであって、前記貯槽から発生する蒸発ガスを抜き出す抜き出しラインと、前記蒸発ガスを吸着する吸着材が収容された三つ以上の吸着容器と、前記貯槽から低温液体を送出する送出ポンプと、該送出ポンプによって送出された低温液体が流れる低温液体送出ラインと、該低温液体送出ラインに設けられて前記低温液体の冷熱を利用して熱交換する熱交換器と、該熱交換器及び前記三つ以上の吸着容器と接続され、前記抜き出しラインから抜き出された蒸発ガスを導入して前記三つ以上の吸着容器のうち少なくとも一つと前記熱交換器との間で循環させる循環ラインと、を備えたことを特徴とするものである。 (2) The evaporative gas processing system according to the present invention processes evaporative gas generated from a storage tank in which a cryogenic liquid is stored, and is characterized in that it comprises an extraction line for extracting the evaporative gas generated from the storage tank, three or more adsorption vessels containing an adsorbent for adsorbing the evaporative gas, a delivery pump for delivering the cryogenic liquid from the storage tank, a cryogenic liquid delivery line through which the cryogenic liquid delivered by the delivery pump flows, a heat exchanger provided in the cryogenic liquid delivery line for heat exchange using the cold heat of the cryogenic liquid, and a circulation line connected to the heat exchanger and the three or more adsorption vessels, which introduces the evaporative gas extracted from the extraction line and circulates it between at least one of the three or more adsorption vessels and the heat exchanger.

(3)また、本発明に係る蒸発ガス処理方法は、上記(2)に記載の蒸発ガス処理システムを用いて蒸発ガスを処理する方法であって、前記吸着容器のそれぞれにおいて、前記循環ラインを通流する蒸発ガスを前記吸着材に吸着させる吸着処理と、該吸着処理で吸着した蒸発ガスを加熱して前記吸着材から脱着させ、該脱着により昇圧した蒸発ガスを前記低温液体送出ライン又は前記貯槽内の圧力よりも高圧の系に導入する脱着処理と、該脱着処理の後、吸着容器に残った残ガスを前記循環ラインに排出して吸着容器内を減圧する残ガス処理とを行うこととし、前記三つ以上の吸着容器で前記吸着処理を順次行うことで前記貯槽から連続的に蒸発ガスを抜き出し、かつ、少なくとも一つの吸着容器で前記残ガス処理を行う間に残りの吸着容器のいずれかで前記吸着処理を行うことで前記一つの吸着容器の残ガスを吸着処理中の前記二つ以上の吸着容器のいずれかに前記循環ラインを介して導入するようにしたことを特徴とするものである。 (3) The evaporative gas processing method according to the present invention is a method for processing evaporative gas using the evaporative gas processing system described in (2) above, and in each of the adsorption vessels, an adsorption process is performed in which the evaporative gas flowing through the circulation line is adsorbed by the adsorbent, a desorption process is performed in which the evaporative gas adsorbed in the adsorption process is heated to desorb from the adsorbent and the evaporative gas pressurized by the desorption is introduced into the low-temperature liquid delivery line or into a system having a higher pressure than the pressure in the storage tank, and a residual gas process is performed in which the residual gas remaining in the adsorption vessel after the desorption process is discharged into the circulation line to reduce the pressure inside the adsorption vessel. The adsorption process is performed sequentially in the three or more adsorption vessels to continuously extract the evaporative gas from the storage tank, and while the residual gas process is performed in at least one adsorption vessel, the adsorption process is performed in one of the remaining adsorption vessels, so that the residual gas in one of the adsorption vessels is introduced through the circulation line into one of the two or more adsorption vessels undergoing the adsorption process.

本発明においては、二つの吸着容器で吸着処理を交互に行うことで貯槽から連続的に蒸発ガスを抜き出し、かつ、一方の吸着容器で吸着処理を行う間に他方の吸着容器で脱着処理及び残ガス処理を行うことで他方の吸着容器の残ガスを吸着処理中の一方の吸着容器に循環ラインを介して導入するようにしたことにより、蒸発ガスの処理効率を低下させることなく残ガスを処理することができ、効率的に蒸発ガスを処理できる。 In the present invention, the adsorption process is alternately performed in two adsorption vessels to continuously extract evaporated gas from the storage tank, and while the adsorption process is being performed in one adsorption vessel, the desorption process and residual gas process are performed in the other adsorption vessel, so that the residual gas in the other adsorption vessel is introduced via a circulation line into the one adsorption vessel undergoing the adsorption process. This makes it possible to process the residual gas without reducing the efficiency of the evaporation gas processing, and thus allows for efficient evaporation gas processing.

本発明の実施の形態1に係る蒸発ガス処理方法の説明図である。1 is an explanatory diagram of an evaporated gas processing method according to a first embodiment of the present invention; 本発明の実施の形態1に係る蒸発ガス処理システムの説明図である。1 is an explanatory diagram of an evaporative gas processing system according to a first embodiment of the present invention; 図2の蒸発ガス処理システムにおける状態1の状態を示す図である。FIG. 3 is a diagram showing a state 1 in the evaporative gas treatment system of FIG. 2 . 図2の蒸発ガス処理システムにおける状態2の状態を示す図である。FIG. 3 is a diagram showing a state 2 in the evaporative gas treatment system of FIG. 2 . 図2の蒸発ガス処理システムにおける状態3の状態を示す図である。FIG. 3 is a diagram showing a state 3 in the evaporative gas treatment system of FIG. 2 . 図2の蒸発ガス処理システムにおける状態4の状態を示す図である。FIG. 3 is a diagram showing a state 4 in the evaporative emission processing system of FIG. 2 . 図2の蒸発ガス処理システムにおける状態5の状態を示す図である。FIG. 3 is a diagram showing a state 5 in the evaporative emission processing system of FIG. 2 . 図2の蒸発ガス処理システムにおける課題を説明する説明図である。FIG. 3 is an explanatory diagram for explaining a problem in the evaporative gas processing system of FIG. 2 . 本発明の実施の形態2に係る蒸発ガス処理システムの説明図である。FIG. 11 is an explanatory diagram of an evaporative gas processing system according to a second embodiment of the present invention. 本発明の実施の形態2に係る蒸発ガス処理方法の説明図である。FIG. 6 is an explanatory diagram of an evaporated gas processing method according to a second embodiment of the present invention. 図9の蒸発ガス処理システムにおける状態1の状態を示す図である。FIG. 10 is a diagram showing a state 1 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態2の状態を示す図である。FIG. 10 is a diagram showing a state 2 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態3の状態を示す図である。FIG. 10 is a diagram showing a state 3 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態4の状態を示す図である。FIG. 10 is a diagram showing a state 4 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態5の状態を示す図である。FIG. 10 is a diagram showing a state 5 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態6の状態を示す図である。FIG. 10 is a diagram showing a state 6 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態7の状態を示す図である。FIG. 10 is a diagram showing a state 7 in the evaporative gas processing system of FIG. 9 . 図9の蒸発ガス処理システムにおける状態8の状態を示す図である。FIG. 10 is a diagram showing a state 8 in the evaporative emission processing system of FIG. 9 .

[実施の形態1]
本実施の形態に係る蒸発ガス処理方法は、図2に示すような蒸発ガス処理システム1を用いて低温液体が貯留された貯槽から発生する蒸発ガスを処理する方法である。本実施の形態の蒸発ガス処理方法を説明するのに先立ち、まずは、本実施の形態に係る蒸発ガス処理システム1を図2に基づいて以下具体的に説明する。
[First embodiment]
The evaporative gas processing method according to this embodiment is a method for processing evaporative gas generated from a storage tank in which a cryogenic liquid is stored, using an evaporative gas processing system 1 as shown in Fig. 2. Before describing the evaporative gas processing method according to this embodiment, the evaporative gas processing system 1 according to this embodiment will first be specifically described below with reference to Fig. 2.

蒸発ガス処理システム1は、LNG等の低温液体3が貯留された貯槽5から発生する蒸発ガスを抜き出す抜き出しライン7と、蒸発ガスを吸着する吸着材が収容された二つの吸着容器9と、貯槽5から低温液体3を送出する送出ポンプ11と、送出ポンプ11によって送出された低温液体3が流れる低温液体送出ライン13と、低温液体送出ライン13に設けられて低温液体3の冷熱を利用して熱交換する熱交換器15と、熱交換器15及び二つの吸着容器9と接続され、抜き出しライン7から抜き出された蒸発ガスを導入して二つの吸着容器9のうち一つと熱交換器15との間で循環させる循環ライン17とを備えている。 The evaporative gas treatment system 1 includes an extraction line 7 that extracts the evaporative gas generated from a storage tank 5 in which a low-temperature liquid 3 such as LNG is stored, two adsorption vessels 9 that contain an adsorbent that adsorbs the evaporative gas, a delivery pump 11 that delivers the low-temperature liquid 3 from the storage tank 5, a low-temperature liquid delivery line 13 through which the low-temperature liquid 3 delivered by the delivery pump 11 flows, a heat exchanger 15 that is provided in the low-temperature liquid delivery line 13 and uses the cold energy of the low-temperature liquid 3 for heat exchange, and a circulation line 17 that is connected to the heat exchanger 15 and the two adsorption vessels 9 and introduces the evaporative gas extracted from the extraction line 7 and circulates it between one of the two adsorption vessels 9 and the heat exchanger 15.

<抜き出しライン>
抜き出しライン7は、貯槽5に貯留された低温液体3が蒸発して発生する蒸発ガス(一般的に、「ボイルオフガス」、「BOG」ともいう)を、貯槽5から抜き出すラインであり、一端が貯槽5、他端が循環ライン17に接続されている。抜き出しライン7に設けられた開閉弁V1を開放することで、貯槽5から抜き出された蒸発ガスが循環ライン17に導入される。
<Extraction line>
The extraction line 7 is a line for extracting from the storage tank 5 the evaporated gas (generally also referred to as "boil-off gas" or "BOG") generated by evaporation of the cryogenic liquid 3 stored in the storage tank 5, and is connected at one end to the storage tank 5 and at the other end to a circulation line 17. By opening an on-off valve V1 provided on the extraction line 7, the evaporated gas extracted from the storage tank 5 is introduced into the circulation line 17.

<吸着容器>
吸着容器9は、抜き出しライン7から抜き出された蒸発ガスを吸着するための吸着材が収容されたものである。
吸着容器9に収容される吸着材(例えば活性炭など)の吸着能力は、低温ほど大きくなるので、吸着材を低温状態に保つことで、吸着材の吸着量が増大し、大量の蒸発ガスを吸着することができる。また、大量の蒸発ガスを保持した吸着材に熱源を与えて温度を上げることで、吸着材の吸着能力が低下し、吸着していた蒸発ガスを放出(脱着)させることができる。以下、吸着していた蒸発ガスが脱着したものを脱着ガスという。
なお、本実施の形態の蒸発ガス処理システム1は吸着容器9を二つ備えているので、以下、特定のため、それぞれの吸着容器9を、吸着容器A、吸着容器Bとする。
<Adsorption vessel>
The adsorption vessel 9 contains an adsorbent for adsorbing the evaporated gas extracted from the extraction line 7 .
The adsorption capacity of the adsorbent (such as activated carbon) contained in the adsorption vessel 9 increases at lower temperatures, so by keeping the adsorbent at a low temperature, the adsorption capacity of the adsorbent increases, making it possible to adsorb a large amount of evaporated gas. In addition, by providing a heat source to the adsorbent holding a large amount of evaporated gas to raise the temperature, the adsorption capacity of the adsorbent decreases, making it possible to release (desorb) the adsorbed evaporated gas. Hereinafter, the desorbed adsorbed evaporated gas is referred to as desorbed gas.
In addition, since the evaporative gas processing system 1 of this embodiment includes two adsorption vessels 9, the adsorption vessels 9 will be referred to as adsorption vessel A and adsorption vessel B for the sake of identification hereinafter.

<低温液体送出ライン>
低温液体送出ライン13は、貯槽5から送出される低温液体3を気化してガス幹線へ送出するラインであり、貯槽5内に設けられた送出ポンプ11と、気液混合器19と、昇圧ポンプ21と、熱交換器15と、気化器23と、圧調弁25が設けられている。
送出ポンプ11によって貯槽5から払い出された低温液体3は、気液混合器19を介して昇圧ポンプ21に導入され、昇圧ポンプ21によって昇圧された後、熱交換器15を介して気化器23に導入され、気化器23によって加熱気化され、その後圧調弁25を介してガス幹線に送出される。気化器23の熱源としては、例えば海水があげられる。
<Cryogenic liquid delivery line>
The low-temperature liquid delivery line 13 is a line that vaporizes the low-temperature liquid 3 delivered from the storage tank 5 and delivers it to the gas main line, and is equipped with a delivery pump 11, a gas-liquid mixer 19, a boost pump 21, a heat exchanger 15, a vaporizer 23, and a pressure regulating valve 25 provided in the storage tank 5.
The cryogenic liquid 3 discharged from the storage tank 5 by the delivery pump 11 is introduced into the boost pump 21 via the gas-liquid mixer 19, and after being pressurized by the boost pump 21, is introduced into the vaporizer 23 via the heat exchanger 15, is heated and vaporized by the vaporizer 23, and is then sent to the gas trunk line via the pressure regulating valve 25. The heat source of the vaporizer 23 is, for example, seawater.

送出ポンプ11と昇圧ポンプ21の間に設けられた気液混合器19は、吸着容器9から脱着したガスを低温液体3に気液混合して凝縮させるものである。気液混合器19には、気液混合器19に脱着したガスを導入する第2脱着ガス供給ライン31bが接続されている。第2脱着ガス供給ライン31bについては後述する。
貯槽5から払い出された低温液体3は、気液混合器19によって第2脱着ガス供給ライン31bから供給される脱着ガスと気液混合されて脱着ガスが凝縮したのち、昇圧ポンプ21に導入される。
The gas-liquid mixer 19 provided between the delivery pump 11 and the boost pump 21 mixes the gas desorbed from the adsorption vessel 9 with the cryogenic liquid 3 and condenses it. A second desorbed gas supply line 31b for introducing the desorbed gas into the gas-liquid mixer 19 is connected to the gas-liquid mixer 19. The second desorbed gas supply line 31b will be described later.
The cryogenic liquid 3 discharged from the storage tank 5 is mixed with the desorbed gas supplied from the second desorbed gas supply line 31b by the gas-liquid mixer 19, and the desorbed gas is condensed, and then introduced into the boost pump 21.

昇圧ポンプ21と気化器23の間に設けられた熱交換器15は、低温液体3の冷熱を利用して熱交換するものであり、熱交換器15には、循環ライン17が接続されている。
昇圧ポンプ21で昇圧されて過冷度の上がった低温液体3は、熱交換器15に導入され、低温液体3の冷熱によって、循環ライン17を流れる蒸発ガスを冷却する。
The heat exchanger 15 provided between the boost pump 21 and the vaporizer 23 exchanges heat by utilizing the cold energy of the cryogenic liquid 3 , and a circulation line 17 is connected to the heat exchanger 15 .
The cryogenic liquid 3 whose pressure has been increased by the boost pump 21 and whose degree of supercooling has been increased is introduced into the heat exchanger 15 , and the evaporated gas flowing through the circulation line 17 is cooled by the cold energy of the cryogenic liquid 3 .

気化器23の下流に設けられた圧調弁25は、低温液体送出ライン13における気化器23の下流のガス(以下、「気化ガス」という)の圧力を調整するものである。
詳しくは後述するが、本実施の形態は、低温液体送出ライン13における気化器23の下流の気化ガスを用いて、気化ガスと同程度の圧力に昇圧された蒸発ガス(脱着ガス)を低温液体送出ライン13の低温液体3及び気化ガスに導入するものである。
脱着ガスは気化ガスと同程度の圧力に昇圧されるものの、吸着容器9や配管の圧力損失によって圧力が低下して低温液体送出ライン13の気化ガスよりも低圧になるので、気化ガスに脱着ガスを導入できない場合がある。そのため、圧調弁25によって気化ガスを減圧して、脱着ガスを気化ガスに導入できるようにしている。
The pressure regulating valve 25 provided downstream of the vaporizer 23 adjusts the pressure of the gas downstream of the vaporizer 23 in the cryogenic liquid delivery line 13 (hereinafter referred to as “vaporized gas”).
As will be described in more detail later, this embodiment uses the vaporized gas downstream of the vaporizer 23 in the cryogenic liquid delivery line 13, and introduces evaporated gas (desorbed gas) pressurized to a pressure approximately the same as that of the vaporized gas into the cryogenic liquid 3 and vaporized gas in the cryogenic liquid delivery line 13.
Although the desorbed gas is pressurized to the same level as the vaporized gas, the pressure of the desorbed gas decreases due to pressure loss in the adsorption vessel 9 and piping, and becomes lower than the pressure of the vaporized gas in the low-temperature liquid delivery line 13, so that the desorbed gas may not be introduced into the vaporized gas. For this reason, the vaporized gas is depressurized by the pressure regulating valve 25 so that the desorbed gas can be introduced into the vaporized gas.

もっとも、ガス幹線には所定の要求圧力があるので、それを下回るような減圧を行うことは難しい。したがって、上記圧力損失を考慮して、ガス幹線の要求圧力より高めに低温液体3を昇圧ポンプ21で昇圧し、圧調弁25で減圧してもガス幹線の要求圧力を満たすようにすればよい。
また、脱着ガス供給ライン31に昇圧装置を設けるなどして、脱着ガスを昇圧するようにしてもよい。その場合、圧調弁25を省略してもよい。
However, since the gas main line has a predetermined required pressure, it is difficult to reduce the pressure below that pressure. Therefore, taking the above pressure loss into consideration, the cryogenic liquid 3 is boosted by the boost pump 21 to a pressure higher than the required pressure of the gas main line, and the required pressure of the gas main line is satisfied even if the pressure is reduced by the pressure regulating valve 25.
Moreover, the desorption gas may be pressurized by providing a pressure booster in the desorption gas supply line 31. In this case, the pressure regulating valve 25 may be omitted.

<循環ライン>
循環ライン17は、抜き出しライン7から導入される蒸発ガスを、吸着容器A又は吸着容器Bのいずれか一つと熱交換器15との間で循環させるものである。
循環ライン17は分岐して、吸着容器A、Bとそれぞれ接続されており、吸着容器A側に接続している循環ライン17には開閉弁V2、V3、吸着容器B側に接続している循環ライン17には開閉弁V4、V5が設けられている。
<Circulation Line>
The circulation line 17 circulates the evaporated gas introduced from the withdrawal line 7 between either the adsorption vessel A or the adsorption vessel B and the heat exchanger 15 .
The circulation line 17 branches off and is connected to the adsorption vessels A and B, respectively. The circulation line 17 connected to the adsorption vessel A side is provided with on-off valves V2 and V3, and the circulation line 17 connected to the adsorption vessel B side is provided with on-off valves V4 and V5.

吸着容器Aと熱交換器15との間で蒸発ガスを循環させる場合には、開閉弁V2、V3を開放すると共に開閉弁V4、V5を閉止する。
同様に、吸着容器Bと熱交換器15との間で蒸発ガスを循環させる場合には、開閉弁V4、V5を開放すると共に開閉弁V2、V3を閉止する。
When circulating the evaporated gas between the adsorption vessel A and the heat exchanger 15, the on-off valves V2 and V3 are opened and the on-off valves V4 and V5 are closed.
Similarly, when circulating the evaporated gas between the adsorption vessel B and the heat exchanger 15, the on-off valves V4 and V5 are opened and the on-off valves V2 and V3 are closed.

抜き出しライン7から抜き出された蒸発ガスは、循環ライン17に設けられた循環ブロワ27の上流に導入され、循環ブロワ27によって熱交換器15へ供給される。蒸発ガスは熱交換器15で低温液体送出ライン13を流れる低温液体3の冷熱によって冷却され、吸着容器9のいずれか一つ(吸着容器A又は吸着容器B)に導入される。 The evaporated gas extracted from the extraction line 7 is introduced upstream of the circulation blower 27 installed in the circulation line 17 and is supplied to the heat exchanger 15 by the circulation blower 27. The evaporated gas is cooled in the heat exchanger 15 by the cold heat of the cryogenic liquid 3 flowing in the cryogenic liquid delivery line 13, and is introduced into one of the adsorption vessels 9 (adsorption vessel A or adsorption vessel B).

吸着容器9に導入された蒸発ガスは、吸着容器9に収容された吸着材に吸着される。蒸発ガスは吸着容器9に導入される前に熱交換器15によって冷却されているので、蒸発ガスの冷熱によって吸着材が冷却され、蒸発ガスの吸着が促進される。 The evaporated gas introduced into the adsorption vessel 9 is adsorbed by the adsorbent contained in the adsorption vessel 9. Because the evaporated gas is cooled by the heat exchanger 15 before being introduced into the adsorption vessel 9, the adsorbent is cooled by the cold heat of the evaporated gas, accelerating the adsorption of the evaporated gas.

吸着材が蒸発ガスを吸着すると、吸着熱が発生する。吸着熱とは、空間中を飛び回っていた気体の分子が吸着材表面に固定化される際に、気体の持っていた運動エネルギーが熱となって発現されるものである。吸着が進むと、この吸着熱によって、容器内の温度が上昇し、吸着量が低下する。 When the adsorbent adsorbs evaporated gas, heat of adsorption is generated. Heat of adsorption is the kinetic energy of the gas that is expressed as heat when the gas molecules flying around in space are fixed on the surface of the adsorbent. As adsorption progresses, this heat of adsorption causes the temperature inside the container to rise and the amount of adsorption to decrease.

ある程度吸着量が低下すると、吸着容器9に導入した蒸発ガスの全量を吸着することができなくなるので、吸着されない蒸発ガスは再度循環ライン17に払い出される。吸着容器9から循環ライン17に払い出された蒸発ガスは、抜き出しライン7から導入される蒸発ガスと混合されて、熱交換器15で再冷却されてから吸着容器9に戻される。再冷却された蒸発ガスの冷熱により、吸着材が冷却されて、再び蒸発ガスの吸着が促進される。 When the amount of adsorption decreases to a certain extent, it becomes impossible to adsorb the entire amount of evaporated gas introduced into the adsorption vessel 9, so the unadsorbed evaporated gas is discharged again to the circulation line 17. The evaporated gas discharged from the adsorption vessel 9 to the circulation line 17 is mixed with the evaporated gas introduced from the extraction line 7, and is recooled in the heat exchanger 15 before being returned to the adsorption vessel 9. The cold energy of the recooled evaporated gas cools the adsorbent, again promoting the adsorption of the evaporated gas.

このように、循環ライン17があることで吸着容器9内を冷却し続けることができるので、高い吸着量を保つことができ、大量の蒸発ガスを吸着することができる。
また、蒸発ガスを低温液体3の冷熱を用いて吸着材の冷却をするための冷媒として用いているので、吸着材との直接接触により熱輸送が行われ、温度変化の応答性が良い。これにより、吸着工程の処理時間を短く抑えることができる。
In this way, the presence of the circulation line 17 allows the interior of the adsorption vessel 9 to be continuously cooled, so that a high adsorption amount can be maintained and a large amount of evaporated gas can be adsorbed.
In addition, since the evaporated gas is used as a refrigerant to cool the adsorbent using the cold energy of the low-temperature liquid 3, heat is transferred by direct contact with the adsorbent, and the response to temperature changes is good, thereby making it possible to shorten the processing time of the adsorption process.

吸着材によって所定の量まで蒸発ガスを吸着すると、吸着処理を停止して、脱着処理に移行する。前述したように、吸着材に吸着された蒸発ガスの脱着は吸着材を加熱することで行う。加熱のための熱源として、本実施の形態の蒸発ガス処理システム1では、図2に示すようなガス供給ライン29を設けて、低温液体3が気化したガス(気化ガス)を吸着容器9に導入するようにしている。 When the adsorbent has adsorbed a predetermined amount of evaporated gas, the adsorption process is stopped and the process moves to the desorption process. As described above, the evaporated gas adsorbed by the adsorbent is desorbed by heating the adsorbent. In the evaporated gas processing system 1 of this embodiment, a gas supply line 29 as shown in FIG. 2 is provided as a heat source for heating, and the gas (vaporized gas) produced by vaporizing the low-temperature liquid 3 is introduced into the adsorption vessel 9.

<ガス供給ライン>
ガス供給ライン29は、低温液体3が気化したガスを吸着容器9のいずれか一つに供給するものであり、一端側は低温液体送出ライン13における気化器23の下流側、他端側は分岐して吸着容器A、Bにそれぞれ接続されている。ガス供給ライン29における低温液体送出ライン13側には開閉弁V6が設けられており、分岐している部分の吸着容器A側には開閉弁V7、吸着容器B側には開閉弁V8が設けられている。
<Gas supply line>
The gas supply line 29 supplies the gas obtained by vaporizing the cryogenic liquid 3 to one of the adsorption vessels 9, with one end being connected to the downstream side of the vaporizer 23 in the cryogenic liquid delivery line 13 and the other end being branched and connected to the adsorption vessels A and B. An on-off valve V6 is provided on the cryogenic liquid delivery line 13 side of the gas supply line 29, and an on-off valve V7 is provided on the adsorption vessel A side of the branched portion, and an on-off valve V8 is provided on the adsorption vessel B side.

吸着容器Aに気化ガスを導入する場合には、開閉弁V6、V7を開放すると共に開閉弁V8を閉止する。
同様に、吸着容器Bに気化ガスを導入する場合には、開閉弁V6、V8を開放すると共に開閉弁V7を閉止する。
When vaporized gas is introduced into the adsorption vessel A, the on-off valves V6 and V7 are opened and the on-off valve V8 is closed.
Similarly, when vaporized gas is introduced into the adsorption vessel B, the on-off valves V6 and V8 are opened and the on-off valve V7 is closed.

気化器23の下流側の気化ガスは、高温のガス(例えば5℃)であるので、ガス供給ライン29から気化ガスが吸着容器9に導入されることで、容器内の温度が上がり、吸着材に吸着された蒸発ガスの脱着が行われる。吸着容器9内は、蒸発ガスを冷却しながら循環させたことで、大量の蒸発ガスを保持した状態であり、そこに、高温の気化ガスを導入することで、吸着されていた大量の蒸発ガスが脱着され、高い圧力の脱着ガスを得ることができる。
また、熱源である気化ガスを直接吸着容器9内に導入するので、吸着材と直接接触して熱輸送が行われるため温度変化の応答性が良く、脱着工程の処理時間を短く抑えることができる。
The vaporized gas downstream of the vaporizer 23 is a high-temperature gas (e.g., 5°C), so that when the vaporized gas is introduced from the gas supply line 29 into the adsorption vessel 9, the temperature inside the vessel rises and the evaporated gas adsorbed by the adsorbent is desorbed. A large amount of evaporated gas is held inside the adsorption vessel 9 by circulating the evaporated gas while cooling it, and when high-temperature vaporized gas is introduced therein, the large amount of adsorbed evaporated gas is desorbed, and a desorbed gas at high pressure can be obtained.
In addition, since the vaporized gas serving as the heat source is directly introduced into the adsorption vessel 9, heat transfer takes place through direct contact with the adsorbent, resulting in good response to temperature changes and enabling the processing time of the desorption step to be kept short.

吸着材を加熱することによって得られた脱着ガスを有効利用するため、本実施の形態の蒸発ガス処理システム1では、脱着ガス供給ライン31を設けて、脱着ガスを低温液体送出ライン13に導入するようにしている。 In order to effectively utilize the desorbed gas obtained by heating the adsorbent, the evaporative gas processing system 1 of this embodiment is provided with a desorbed gas supply line 31 to introduce the desorbed gas into the low-temperature liquid delivery line 13.

<脱着ガス供給ライン>
脱着ガス供給ライン31は、吸着容器9から払い出された脱着ガスを低温液体送出ライン13に導入するものであり、一端側が分岐して吸着容器A、Bとそれぞれ接続している。また、他端側も分岐して、一方が低温液体送出ライン13における気化器23の下流側、他方が気液混合器19に接続している。気化器23の下流側に接続している部分を第1脱着ガス供給ライン31a、気液混合器19に接続している部分を第2脱着ガス供給ライン31bとする。
脱着ガス供給ライン31における吸着容器Aに接続する部分には開閉弁V9、吸着容器Bに接続する部分には開閉弁V10が設けられている。また、第1脱着ガス供給ライン31aには開閉弁V11、第2脱着ガス供給ライン31bには開閉弁V12が設けられている。
<Desorption gas supply line>
The desorption gas supply line 31 introduces the desorption gas discharged from the adsorption vessel 9 into the cryogenic liquid delivery line 13, and one end of the line branches off to be connected to the adsorption vessels A and B. The other end of the line also branches off, with one end connected to the downstream side of the vaporizer 23 in the cryogenic liquid delivery line 13 and the other connected to the gas-liquid mixer 19. The portion connected to the downstream side of the vaporizer 23 is referred to as a first desorption gas supply line 31a, and the portion connected to the gas-liquid mixer 19 is referred to as a second desorption gas supply line 31b.
An on-off valve V9 is provided in the desorption gas supply line 31 at a portion connected to the adsorption vessel A, and an on-off valve V10 is provided in a portion connected to the adsorption vessel B. In addition, an on-off valve V11 is provided in the first desorption gas supply line 31a, and an on-off valve V12 is provided in the second desorption gas supply line 31b.

例えば、吸着容器Aの脱着ガスを低温液体送出ライン13における気化器23の下流の気化ガスに導入する場合には、開閉弁V9、V11を開放すると共に開閉弁V10、V12を閉止する。また、吸着容器Aの脱着ガスを低温液体送出ライン13における気液混合器19に導入する場合には、開閉弁V9、V12を開放すると共に開閉弁V10、V11を閉止する。このように、開閉弁V11、V12の開閉状態を切り替えることにより、吸着容器Aから払いだされる脱着ガスを気化器23の下流の気体状態の低温液化ガス3(気化ガス)に導入するか、気化器23の上流の液体状態の低温液化ガス3に導入するかを切り替えることができる。開閉弁V9に代えて開閉弁V10を操作すれば、吸着容器Bの脱着ガスを上記と同様に低温液体送出ライン13に導入することができる。 For example, when the desorbed gas of the adsorption vessel A is introduced into the vaporized gas downstream of the vaporizer 23 in the low-temperature liquid delivery line 13, the on-off valves V9 and V11 are opened and the on-off valves V10 and V12 are closed. When the desorbed gas of the adsorption vessel A is introduced into the gas-liquid mixer 19 in the low-temperature liquid delivery line 13, the on-off valves V9 and V12 are opened and the on-off valves V10 and V11 are closed. In this way, by switching the open/close state of the on-off valves V11 and V12, it is possible to switch whether the desorbed gas discharged from the adsorption vessel A is introduced into the low-temperature liquefied gas 3 in a gaseous state downstream of the vaporizer 23 (vaporized gas) or into the low-temperature liquefied gas 3 in a liquid state upstream of the vaporizer 23. By operating the on-off valve V10 instead of the on-off valve V9, the desorbed gas of the adsorption vessel B can be introduced into the low-temperature liquid delivery line 13 in the same manner as described above.

脱着ガスを気化器23の下流に導入するか、上流に導入するかは、脱着ガスの圧力に応じて選択する。本実施の形態のように、吸着容器9に気化ガスを導入して蒸発ガスを脱着させた場合、脱着ガスは気化ガスと同程度の圧力まで昇圧されるので、まずは第1脱着ガス供給ライン31aを介して気化器23の下流の気化ガスに脱着ガスを導入する。 Whether the desorption gas is introduced downstream or upstream of the vaporizer 23 is selected depending on the pressure of the desorption gas. When the vaporization gas is introduced into the adsorption vessel 9 to desorb the evaporated gas as in this embodiment, the desorption gas is pressurized to a pressure approximately equal to that of the vaporization gas, so the desorption gas is first introduced into the vaporization gas downstream of the vaporizer 23 via the first desorption gas supply line 31a.

前述のように吸着容器9内に吸着している蒸発ガス量が減少するのに伴って脱着ガスの圧力も低下するので、脱着ガスが気化ガスよりも低圧になった場合には、気化ガスへの導入を停止し、気液混合器19へ脱着ガスを導入する。この時の脱着ガスは気液混合器19を通流する低温液体3よりも高圧なので、昇圧装置等を必要とすることなく低温液体3に気液混合することができる。 As described above, the pressure of the desorbed gas decreases as the amount of evaporated gas adsorbed in the adsorption vessel 9 decreases, so when the desorbed gas becomes at a lower pressure than the vaporized gas, its introduction into the vaporized gas is stopped and the desorbed gas is introduced into the gas-liquid mixer 19. At this time, the desorbed gas is at a higher pressure than the low-temperature liquid 3 flowing through the gas-liquid mixer 19, so the gas-liquid mixture can be mixed into the low-temperature liquid 3 without the need for a booster device or the like.

上記のように構成された蒸発ガス処理システム1を用いて行う本実施の形態の蒸発ガス処理方法について、図1を用いて説明する。
本実施の形態に係る蒸発ガス処理方法は、図1に示すように、二つの吸着容器9のそれぞれにおいて、循環ライン17を通流する蒸発ガスを吸着材に吸着させる吸着処理と、該吸着処理で吸着した蒸発ガスを加熱して吸着材から脱着させ、該脱着により昇圧した蒸発ガス(脱着ガス)を低温液体送出ライン13に導入する脱着処理と、該脱着処理の後、吸着容器9に残った残ガスを循環ライン17に排出して吸着容器9内を減圧する残ガス処理とを行うこととし、二つの吸着容器9で吸着処理を交互に行うことで貯槽5から連続的に蒸発ガスを抜き出し、かつ、一方の吸着容器9で吸着処理を行う間に他方の吸着容器9で脱着処理及び残ガス処理を行うことで他方の吸着容器9の残ガスを吸着処理中の一方の吸着容器9に循環ライン17を介して導入するようにしたものである。
以下、図1の蒸発ガス処理方法について、その過程における図2の蒸発ガス処理システム1の開閉弁V1~V12の開閉状態を図3~図7に例示して説明する。なお、図3~図7の開閉弁V1~V12は、開状態の場合には白抜き、閉状態の場合には黒塗りで示している。さらに、低温液体3及び各ガス(気化ガス、蒸発ガス、脱着ガス)が通流している導管のみ、流れの方向を示すと共に太線にしている。
また、下記の説明における温度及び圧力は一例を示すものであり、実際の運用時にはこの限りではない。
The evaporative gas processing method according to this embodiment, which is carried out using the evaporative gas processing system 1 configured as above, will be described with reference to FIG.
As shown in FIG. 1 , the evaporative gas processing method according to this embodiment performs the following steps in each of the two adsorption vessels 9: an adsorption process in which the evaporative gas flowing through the circulation line 17 is adsorbed by the adsorbent; a desorption process in which the evaporative gas adsorbed in the adsorption process is heated to desorb from the adsorbent and the evaporated gas (desorbed gas) pressurized by the desorption is introduced into the cryogenic liquid delivery line 13; and a residual gas process in which, after the desorption process, the residual gas remaining in the adsorption vessels 9 is discharged into the circulation line 17 and the inside of the adsorption vessels 9 is depressurized. By alternately performing the adsorption processes in the two adsorption vessels 9, the evaporative gas is continuously extracted from the storage tank 5, and while the adsorption process is being performed in one adsorption vessel 9, the desorption process and residual gas process are performed in the other adsorption vessel 9, so that the residual gas in the other adsorption vessel 9 is introduced via the circulation line 17 into the one adsorption vessel 9 undergoing the adsorption process.
The evaporative gas processing method of Fig. 1 will be described below with reference to Fig. 3 to Fig. 7 showing the open and closed states of the on-off valves V1 to V12 of the evaporative gas processing system 1 of Fig. 2 during the process. Note that the on-off valves V1 to V12 in Fig. 3 to Fig. 7 are shown as outlined white when open and as filled in black when closed. Furthermore, only the conduits through which the cryogenic liquid 3 and each gas (vaporized gas, evaporated gas, desorbed gas) flow are shown in bold with the direction of flow indicated.
Furthermore, the temperatures and pressures in the following description are merely examples and are not limited to those used in actual operation.

まず、図3に示すように、開閉弁V1~V3を開放し、吸着容器Aを用いて吸着処理を開始する(状態1)。
貯槽5内のLNG等の低温液体(例えば-163℃)は、送出ポンプ11によって例えば0.5~1.5MPa程度の圧力で低温液体送出ライン13に送出されて気液混合器19に導入される。状態1では気液混合器19に脱着ガスは供給されないので、低温液体3は気液混合器19を通過し、昇圧ポンプ21で4MPa~7MPaに昇圧されて、熱交換器15に導入される。
また、貯槽5内の蒸発ガス(-120℃~-150℃、約0.1MPa)は、抜き出しライン7から抜き出されて、循環ライン17に導入される。循環ライン17に導入された蒸発ガスは、循環ブロワ27によって熱交換器15に送出され、低温液体3と熱交換して、例えば-160℃に冷却される。
蒸発ガスと熱交換した低温液体3は、気化器23によって気化してガス(気化ガス)となり、ガス幹線に送出される。
First, as shown in FIG. 3, the on-off valves V1 to V3 are opened, and the adsorption process is started using the adsorption vessel A (state 1).
A low-temperature liquid (e.g., −163° C.) such as LNG in the storage tank 5 is delivered to the low-temperature liquid delivery line 13 by the delivery pump 11 at a pressure of, for example, about 0.5 to 1.5 MPa and introduced into the gas-liquid mixer 19. Since no desorbed gas is supplied to the gas-liquid mixer 19 in state 1, the low-temperature liquid 3 passes through the gas-liquid mixer 19, is boosted to 4 MPa to 7 MPa by the boost pump 21, and is introduced into the heat exchanger 15.
The evaporated gas (-120°C to -150°C, approximately 0.1 MPa) in the storage tank 5 is extracted through an extraction line 7 and introduced into a circulation line 17. The evaporated gas introduced into the circulation line 17 is sent to the heat exchanger 15 by a circulation blower 27, and is cooled to, for example, -160°C by heat exchange with the cryogenic liquid 3.
The cryogenic liquid 3 that has exchanged heat with the evaporated gas is vaporized by the vaporizer 23 into gas (vaporized gas) and is sent to the gas trunk line.

冷却された蒸発ガスは、吸着容器Aに導入され、吸着容器Aに収容された吸着材と直接接触することで、蒸発ガスが吸着材に吸着すると共に吸着材が冷却される。冷却によって吸着能力が向上するが、一定量吸着が進むと吸着熱によって吸着容器A内の温度が上昇するとともに容器内の蒸発ガスの温度も上昇して冷却効率が低下し、吸着能力の向上が次第に鈍化する。
吸着材が吸着しきれなかった蒸発ガスは、再度循環ライン17に送出され、抜き出しライン7から導入される蒸発ガスと合流して再び熱交換器15で冷却される。冷却された蒸発ガスは吸着容器Aに導入され、吸着材を冷却し吸着が再び促進される。
The cooled evaporated gas is introduced into adsorption vessel A and comes into direct contact with the adsorbent contained in adsorption vessel A, where the evaporated gas is adsorbed onto the adsorbent and the adsorbent is cooled. The adsorption capacity improves by cooling, but after a certain amount of adsorption has progressed, the temperature inside adsorption vessel A rises due to the heat of adsorption, and the temperature of the evaporated gas inside the vessel also rises, reducing the cooling efficiency and gradually slowing down the improvement in adsorption capacity.
The evaporated gas that has not been completely adsorbed by the adsorbent is sent back to the circulation line 17, where it merges with the evaporated gas introduced from the withdrawal line 7 and is cooled again in the heat exchanger 15. The cooled evaporated gas is introduced into the adsorption vessel A, where it cools the adsorbent and promotes adsorption again.

上記のように、発生した吸着熱を熱交換器15で除去しながら吸着材を冷却し続けることにより、吸着容器A内の吸着量が増大する。吸着容器Aによる吸着処理は、吸着容器Aの吸着量が規定量に到達するまで行う。吸着量は、吸着容器A内の圧力及び温度の初期状態からの変化量、または、吸着容器Aの導入側および払出側に設けた積算流量計値の差などから計算することができる。 As described above, the amount of adsorption in adsorption vessel A increases by continuing to cool the adsorbent while removing the generated heat of adsorption in heat exchanger 15. The adsorption process using adsorption vessel A continues until the adsorption amount in adsorption vessel A reaches a specified amount. The amount of adsorption can be calculated from the amount of change from the initial state of the pressure and temperature inside adsorption vessel A, or the difference between the integrated flow meter values installed on the inlet side and outlet side of adsorption vessel A.

吸着容器Aの吸着量が規定量に到達したら、図4に示すように、開閉弁V2、V3を閉止して吸着容器Aの吸着処理を終了すると共に、開閉弁V4、V5を開放して吸着容器Bの吸着処理を開始する(吸着容器Aと同様であるので説明を省略)。また、吸着処理を終了した吸着容器Aの脱着処理を開始する(状態2)。図4において、吸着容器Aの脱着処理に用いる開閉弁V6、V7、V9、V11、V12を全て開状態(白抜き)で示しているが、脱着処理における各開閉弁の操作は下記のように行う。 When the adsorption amount in adsorption vessel A reaches a specified amount, as shown in FIG. 4, on-off valves V2 and V3 are closed to end the adsorption process in adsorption vessel A, and on-off valves V4 and V5 are opened to start the adsorption process in adsorption vessel B (similar to adsorption vessel A, so explanation is omitted). In addition, the desorption process of adsorption vessel A, which has finished the adsorption process, is started (state 2). In FIG. 4, on-off valves V6, V7, V9, V11, and V12 used in the desorption process of adsorption vessel A are all shown in the open state (white), but the operation of each on-off valve in the desorption process is performed as follows.

まず、開閉弁V6、V7を開放し、ガス供給ライン29より、気化ガス(5℃、4MPa~7MPa)を吸着容器Aに導入する。気化ガスを導入することで、蒸発ガスを吸着した吸着材と温度が高い気化ガスが直接接触して吸着材が加熱される。加熱によって、吸着材に吸着されていた蒸発ガスが脱着し、容器内で脱着を進行させることで容器内の脱着ガスの圧力が昇圧される。脱着ガスの昇圧は、必要に応じて任意の値に調整可能であるが、例えば7MPa程度(導入する気化ガスと同程度)まで昇圧することができる。 First, on-off valves V6 and V7 are opened, and vaporized gas (5°C, 4 MPa to 7 MPa) is introduced into adsorption vessel A through gas supply line 29. By introducing the vaporized gas, the adsorbent that has adsorbed the evaporated gas comes into direct contact with the high-temperature vaporized gas, heating the adsorbent. The evaporated gas adsorbed by the adsorbent is desorbed by heating, and the pressure of the desorbed gas in the vessel is increased by allowing the desorption to proceed within the vessel. The pressure of the desorbed gas can be adjusted to any value as needed, but can be increased to around 7 MPa (same as the vaporized gas being introduced), for example.

吸着容器A内の脱着ガスの圧力が所定の圧力(例えばガス幹線の要求圧力以上)まで上昇したら、開閉弁V9、V11を開放して、脱着ガスを低温液体送出ライン13における気化器23の下流側へ導入する。脱着ガスは、吸着容器A内で昇圧されているが、吸着容器Aや配管の圧力損失により低温液体送出ライン13を通流する気化ガスの圧力(4MPa~7MPa)より低圧になるので、低温液体送出ライン13に設けられた圧調弁25によって気化ガスをガス幹線の要求圧力の範囲で減圧してから脱着ガスを低温液体送出ライン13に導入する。 When the pressure of the desorbed gas in the adsorption vessel A rises to a predetermined pressure (for example, equal to or higher than the required pressure of the gas main line), the on-off valves V9 and V11 are opened to introduce the desorbed gas into the cryogenic liquid delivery line 13 downstream of the vaporizer 23. The desorbed gas is pressurized in the adsorption vessel A, but due to pressure losses in the adsorption vessel A and piping, the pressure becomes lower than the pressure of the vaporized gas flowing through the cryogenic liquid delivery line 13 (4 MPa to 7 MPa). Therefore, the vaporized gas is depressurized to within the required pressure range of the gas main line by the pressure regulating valve 25 installed in the cryogenic liquid delivery line 13 before the desorbed gas is introduced into the cryogenic liquid delivery line 13.

吸着材から脱着した脱着ガスの量(脱着量)が増えるにつれて、吸着容器A内のガスの量が減っていくので、脱着ガス供給ライン31を通流する脱着ガスの圧力は徐々に低下する。脱着量が規定量(例えば脱着ガスの圧力がガス幹線の要求圧力以下になると判断される値)に達したら、開閉弁V11を閉止すると共に開閉弁V12を開放して、脱着ガスを昇圧ポンプ21の上流に設けられた気液混合器19へ導入する。この時の脱着ガスの圧力は、ガス幹線の要求圧力を下回ってはいるが、気液混合器19を通流する低温液体3の圧力(0.5~1.5MPa)を上回っているので、圧縮機等を必要とすることなく、低温液体3に気液混合することができる。 As the amount of desorbed gas desorbed from the adsorbent (desorption amount) increases, the amount of gas in the adsorption vessel A decreases, so the pressure of the desorbed gas flowing through the desorption gas supply line 31 gradually decreases. When the desorption amount reaches a specified amount (for example, a value at which the pressure of the desorbed gas is determined to be equal to or lower than the required pressure of the gas main line), the on-off valve V11 is closed and the on-off valve V12 is opened to introduce the desorbed gas into the gas-liquid mixer 19 provided upstream of the boost pump 21. Although the pressure of the desorbed gas at this time is lower than the required pressure of the gas main line, it is higher than the pressure (0.5 to 1.5 MPa) of the low-temperature liquid 3 flowing through the gas-liquid mixer 19, so the gas and liquid can be mixed into the low-temperature liquid 3 without the need for a compressor or the like.

上記は吸着処理終了後、直ちに脱着処理を開始する例であるが、脱着処理はガス幹線の需要状況などに応じて任意のタイミングで行ってもよい。 The above is an example in which the desorption process starts immediately after the adsorption process is completed, but the desorption process may be performed at any time depending on factors such as the demand situation in the gas main line.

吸着容器Aの脱着量が規定量(例えば脱着ガスの圧力が気液混合器19を通流する低温液体3の圧力以下になると判断される値)に到達したら、図5に示すように、開閉弁V6、V7、V9、V12を閉止して脱着処理を終了すると共に開閉弁V3を開放して残ガス処理を開始する(状態3)。 When the desorption amount in adsorption vessel A reaches a specified amount (for example, a value at which it is determined that the pressure of the desorbed gas is equal to or lower than the pressure of the low-temperature liquid 3 flowing through the gas-liquid mixer 19), as shown in FIG. 5, the on-off valves V6, V7, V9, and V12 are closed to end the desorption process, and the on-off valve V3 is opened to start processing the remaining gas (state 3).

脱着処理が終了した時点では、吸着容器Aには0.5~1.5MPa程度の圧力の脱着ガスが残存している。そこで開閉弁V3を開放することにより、高圧(0.5~1.5MPa)の吸着容器Aから低圧(およそ0.1MPa)の循環ラインに残ガスが排出され、吸着容器A内が減圧される。
この時、吸着容器Bは循環ライン17を介して吸着処理を行っているので、循環ライン17に排出された吸着容器Aの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Bに移送され、吸着容器Bの吸着材に吸着される。
At the time when the desorption process is completed, desorbed gas at a pressure of about 0.5 to 1.5 MPa remains in the adsorption vessel A. Then, by opening the on-off valve V3, the remaining gas is discharged from the high-pressure (0.5 to 1.5 MPa) adsorption vessel A to the low-pressure (approximately 0.1 MPa) circulation line, and the pressure inside the adsorption vessel A is reduced.
At this time, since adsorption vessel B is performing adsorption processing via circulation line 17, the residual gas from adsorption vessel A discharged into circulation line 17 is transferred to adsorption vessel B together with the evaporated gas circulating through circulation line 17, and is adsorbed by the adsorbent in adsorption vessel B.

吸着容器A内の圧力が循環ラインの圧力と同程度まで下がったら、開閉弁V3を閉止して残ガス処理を終了する。その後、吸着容器Bの吸着量が規定量に到達したら、図6に示すように、開閉弁V4、V5を閉止して吸着容器Bの吸着処理を終了すると共に、開閉弁V2、V3を開放して吸着容器Aの吸着処理を開始する。また、吸着処理を終了した吸着容器Bの脱着処理を開始する(状態4)。吸着容器Bの脱着処理は開閉弁V6、V8、V10~V12を操作して行うが、各操作については吸着容器Aと同様であるため説明を省略する。 When the pressure inside adsorption vessel A drops to approximately the same level as the pressure in the circulation line, on-off valve V3 is closed to end the remaining gas processing. Thereafter, when the adsorption amount in adsorption vessel B reaches a specified amount, on-off valves V4 and V5 are closed to end the adsorption process in adsorption vessel B, as shown in FIG. 6, and on-off valves V2 and V3 are opened to start the adsorption process in adsorption vessel A. In addition, the desorption process of adsorption vessel B, which has completed the adsorption process, is started (state 4). The desorption process in adsorption vessel B is performed by operating on-off valves V6, V8, and V10 to V12, but as each operation is similar to that in adsorption vessel A, a description will be omitted.

吸着容器Bの脱着処理が終了したら、図7に示すように、開閉弁V5を開放して残ガス処理を開始する(状態5)。吸着容器Aの残ガス処理と同様に、開閉弁V5を開放することで、高圧(0.5~1.5MPa)の吸着容器Bから低圧(およそ0.1MPa)の循環ラインに残ガスが排出され、吸着容器B内が減圧される。
この時、吸着容器Aは循環ライン17を介して吸着処理を行っているので、循環ライン17に排出された吸着容器Bの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Aに移送され、吸着容器Aの吸着材に吸着される。
7, when the desorption process in the adsorption vessel B is completed, the on-off valve V5 is opened to start the process of the remaining gas (state 5). As in the process of the remaining gas in the adsorption vessel A, by opening the on-off valve V5, the remaining gas is discharged from the high-pressure (0.5 to 1.5 MPa) adsorption vessel B to the low-pressure (approximately 0.1 MPa) circulation line, and the pressure inside the adsorption vessel B is reduced.
At this time, since adsorption vessel A is performing adsorption processing via circulation line 17, the residual gas in adsorption vessel B discharged to circulation line 17 is transferred to adsorption vessel A together with the evaporated gas circulating through circulation line 17, and is adsorbed by the adsorbent in adsorption vessel A.

以降、状態2~状態5を繰り返すことにより、二つの吸着容器9で吸着処理を交互に行い、貯槽5から連続的に蒸発ガスを抜き出すことができる。
また、一方の吸着容器9で吸着処理を行う間に他方の吸着容器9で脱着処理と残ガス処理を行うので、他方の吸着容器9の残ガスを吸着処理中の一方の吸着容器9に循環ラインを介して導入できる。
Thereafter, by repeating states 2 to 5, the adsorption process is alternately performed in the two adsorption vessels 9, and the evaporated gas can be continuously extracted from the storage tank 5.
In addition, while adsorption treatment is being performed in one adsorption vessel 9, desorption treatment and residual gas treatment are performed in the other adsorption vessel 9, so that the residual gas in the other adsorption vessel 9 can be introduced via a circulation line into one of the adsorption vessels 9 undergoing adsorption treatment.

上記のように、本実施の形態においては、従来例のように残ガス処理において新たな蒸発ガスが発生することがないので、蒸発ガスの処理効率を低下させることなく残ガスを処理することができ、効率的に蒸発ガスを処理できる。 As described above, in this embodiment, no new evaporated gas is generated during residual gas processing as in the conventional example, so the residual gas can be processed without reducing the efficiency of the evaporated gas processing, and the evaporated gas can be processed efficiently.

[実施の形態2]
上述した実施の形態1は、図2の蒸発ガス処理システム1を用いて蒸発ガスを処理する方法であり、吸着容器9の残ガス処理方法として、他方の吸着容器9の残ガスを吸着処理中の一方の吸着容器9に循環ラインを介して導入するものであった。
図2の蒸発ガス処理システム1を用いて、蒸発ガスを連続的に処理するためには、一方の吸着容器9で吸着処理を行う間に他方の吸着容器9で脱着処理と残ガス処理を完了する必要があるが、脱着処理の開始タイミングや各処理の所要時間によって、蒸発ガスの連続処理が困難な場合がある。この点について、以下、図8を用いて説明する。
[Embodiment 2]
The above-described embodiment 1 is a method for treating evaporative gas using the evaporative gas treatment system 1 of Figure 2, and as a method for treating the residual gas in the adsorption vessel 9, the residual gas in the other adsorption vessel 9 is introduced via a circulation line into one of the adsorption vessels 9 undergoing adsorption treatment.
In order to continuously treat the evaporative gas using the evaporative gas treatment system 1 shown in Fig. 2, it is necessary to complete the desorption process and residual gas treatment in one adsorption vessel 9 while the other adsorption vessel 9 is performing the adsorption process, but continuous treatment of the evaporative gas may be difficult depending on the start timing of the desorption process and the time required for each process. This point will be described below with reference to Fig. 8.

図8(a)は、吸着容器Aにおいて、吸着処理完了後に直ちに脱着処理を行わない場合の例である。
前述したように、脱着処理は、ガス幹線の需要等に応じて任意のタイミングで開始するものである。したがって、図8(a)に示すように、吸着容器Aの吸着処理完了後、待機時間を経てから脱着処理を開始する場合がある。
図8(a)に示した例の吸着処理、脱着処理、残ガス処理に要する時間は、図1に示した例と同じであるが、脱着処理の開始がずれたことにより、吸着容器Aの残ガス処理が完了する前に、吸着容器Bの吸着処理が完了する。
吸着容器Bの吸着処理が完了すると、吸着容器Aの残ガスを循環ライン17を介して吸着容器Bに移送することができなくなり、吸着容器A内を十分に減圧することができない。
FIG. 8(a) shows an example in which the desorption process is not performed immediately after the adsorption process is completed in the adsorption vessel A.
As described above, the desorption process is started at any timing depending on the demand of the gas main line, etc. Therefore, as shown in Fig. 8(a) , after the adsorption process of the adsorption vessel A is completed, the desorption process may be started after a waiting time has elapsed.
The times required for the adsorption process, desorption process, and residual gas processing in the example shown in Figure 8(a) are the same as those in the example shown in Figure 1. However, because the start of the desorption process is delayed, the adsorption process in adsorption vessel B is completed before the residual gas processing in adsorption vessel A is completed.
When the adsorption treatment in adsorption vessel B is completed, the residual gas in adsorption vessel A cannot be transferred to adsorption vessel B via circulation line 17, and the pressure inside adsorption vessel A cannot be sufficiently reduced.

前述したように、吸着処理を行うためには、吸着容器内が十分に減圧されている必要がある。したがって、図8(a)に示した例では、吸着容器Aは吸着処理を行うことができないので、蒸発ガスを連続処理することができない。 As mentioned above, in order to perform the adsorption process, the pressure inside the adsorption vessel must be sufficiently reduced. Therefore, in the example shown in Figure 8 (a), adsorption vessel A cannot perform the adsorption process, and therefore cannot continuously process the evaporated gas.

また、吸着処理完了後、直ちに脱着処理を行っても、各処理に要する時間によって上記と同様の問題が生じる場合がある。
図8(b)は、吸着処理の所要時間<(脱着処理の所要時間+残ガス処理の所要時間)となっている例である。
図8(b)の例においても図8(a)の例と同様に、吸着容器Aの残ガス処理が完了する前に、吸着容器Bの吸着処理が完了するので、吸着容器A内を十分に減圧することができない。
Even if the desorption process is carried out immediately after the adsorption process is completed, the same problem as described above may occur depending on the time required for each process.
FIG. 8B shows an example in which the time required for the adsorption process is less than (the time required for the desorption process+the time required for the remaining gas process).
In the example of Figure 8(b), as in the example of Figure 8(a), the adsorption process in adsorption vessel B is completed before the residual gas process in adsorption vessel A is completed, so the pressure inside adsorption vessel A cannot be sufficiently reduced.

そこで、本実施の形態では、脱着処理の開始タイミングや、各処理の所要時間に関わらずに蒸発ガスを処理可能な蒸発ガス処理システム及び蒸発ガス処理方法について説明する。まず、本実施の形態の蒸発ガス処理システム33を図9に示すと共に、その特徴について以下に説明する。 In this embodiment, therefore, an evaporative gas processing system and an evaporative gas processing method capable of processing evaporative gas regardless of the start timing of the desorption process or the time required for each process will be described. First, the evaporative gas processing system 33 of this embodiment is shown in Figure 9, and its features will be described below.

図2の蒸発ガス処理システム1は吸着容器9が二つ設けられているものであったが、図9に示す蒸発ガス処理システム33は、吸着容器9が三つ設けられている。本実施の形態において新たに追加された吸着容器9を、吸着容器Cとする。 The evaporative gas processing system 1 in FIG. 2 is provided with two adsorption vessels 9, but the evaporative gas processing system 33 shown in FIG. 9 is provided with three adsorption vessels 9. The newly added adsorption vessel 9 in this embodiment is referred to as adsorption vessel C.

また、循環ライン17における吸着容器C側に分岐した部分には開閉弁V13、V14が設けられており、ガス供給ライン29及び脱着ガス供給ライン31における吸着容器C側に分岐した部分には開閉弁V15、V16がそれぞれ設けられている。
上記以外の部分は、図2の蒸発ガス処理システム1と同様であるため、図2と同一の符号を付して説明を省略する。
In addition, on-off valves V13 and V14 are provided at the portion of the circulation line 17 branching off to the adsorption vessel C side, and on-off valves V15 and V16 are provided at the portions of the gas supply line 29 and the desorption gas supply line 31 branching off to the adsorption vessel C side, respectively.
The other parts are similar to those of the evaporative gas processing system 1 in FIG. 2, so they are denoted by the same reference numerals as those in FIG. 2 and the description thereof will be omitted.

上記のように構成された蒸発ガス処理システム33を用いて行う本実施の形態の蒸発ガス処理方法について、図10を用いて説明する。
本実施の形態に係る蒸発ガス処理方法は、図10に示すように、三つの吸着容器9のそれぞれにおいて、循環ライン17を通流する蒸発ガスを吸着材に吸着させる吸着処理と、該吸着処理で吸着した蒸発ガスを加熱して吸着材から脱着させ、該脱着により昇圧した蒸発ガス(脱着ガス)を低温液体送出ライン13に導入する脱着処理と、該脱着処理の後、吸着容器9に残った残ガスを循環ライン17に排出して吸着容器9内を減圧する残ガス処理とを行うこととし、三つの吸着容器9で吸着処理を順次行うことで貯槽5から連続的に蒸発ガスを抜き出し、かつ、一つの吸着容器9で残ガス処理を行う間に他の二つの吸着容器9のいずれかで吸着処理を行うことで一つの吸着容器9の残ガスを吸着処理中の二つの吸着容器9のいずれかに循環ライン17を介して導入するようにしたものである。
以下、図10の蒸発ガス処理方法について、その過程における図9の蒸発ガス処理システム33の開閉弁V1~V16の開閉状態を図11~図18に例示して説明する。なお、図3~図7と同様に、図11~図18の開閉弁V1~V16は、開状態の場合には白抜き、閉状態の場合には黒塗りで示している。さらに、低温液体3及び各ガス(気化ガス、蒸発ガス、脱着ガス)が通流している導管のみ、流れの方向を示すと共に太線にしている。
The evaporative gas processing method according to this embodiment, which is carried out using the evaporative gas processing system 33 configured as above, will be described with reference to FIG.
As shown in FIG. 10 , the evaporative gas processing method according to this embodiment performs the following steps in each of the three adsorption vessels 9: adsorption process in which the evaporative gas flowing through the circulation line 17 is adsorbed by the adsorbent; desorption process in which the evaporative gas adsorbed in the adsorption process is heated and desorbed from the adsorbent and the evaporated gas (desorbed gas) pressurized by the desorption is introduced into the cryogenic liquid delivery line 13; and residual gas process in which, after the desorption process, the residual gas remaining in the adsorption vessels 9 is discharged into the circulation line 17 and the inside of the adsorption vessels 9 is depressurized. By sequentially performing the adsorption processes in the three adsorption vessels 9, evaporative gas is continuously extracted from the storage tank 5, and while residual gas processing is being performed in one adsorption vessel 9, adsorption processing is performed in one of the other two adsorption vessels 9, so that the residual gas in one adsorption vessel 9 is introduced via the circulation line 17 to one of the two adsorption vessels 9 undergoing adsorption processing.
The evaporative gas processing method of Fig. 10 will be described below with reference to Figs. 11 to 18 showing the open and closed states of the on-off valves V1 to V16 of the evaporative gas processing system 33 of Fig. 9 during the process. As in Figs. 3 to 7, the on-off valves V1 to V16 in Figs. 11 to 18 are shown in white when open and in black when closed. Furthermore, only the conduits through which the cryogenic liquid 3 and each gas (vaporized gas, evaporated gas, desorbed gas) flow are shown in bold with the direction of flow indicated.

まず、図11に示すように、開閉弁V1~V3を開放し、吸着容器Aを用いて吸着処理を開始する(状態1)。吸着処理については実施の形態1と同様であるため説明を省略する。 First, as shown in FIG. 11, on-off valves V1 to V3 are opened and adsorption processing is started using adsorption vessel A (state 1). The adsorption processing is the same as in embodiment 1, so a description thereof is omitted.

吸着容器Aの吸着量が規定量に到達したら、図12に示すように、開閉弁V2、V3を閉止して吸着容器Aの吸着処理を終了すると共に、開閉弁V4、V5を開放して吸着容器Bの吸着処理を開始する。また、吸着処理を終了した吸着容器Aの脱着処理を開始する(状態2)。脱着処理についても実施の形態1と同様であるため説明を省略する。 When the adsorption amount in adsorption vessel A reaches a specified amount, as shown in FIG. 12, on-off valves V2 and V3 are closed to end the adsorption process in adsorption vessel A, and on-off valves V4 and V5 are opened to start the adsorption process in adsorption vessel B. In addition, the desorption process of adsorption vessel A, which has completed the adsorption process, is started (state 2). The desorption process is also the same as in embodiment 1, so a description thereof will be omitted.

吸着容器Aの脱着量が規定量(例えば脱着ガスの圧力が気液混合器19を通流する低温液体3の圧力以下になると判断される値)に到達したら、図13に示すように、開閉弁V6、V7、V9、V12を閉止して脱着処理を終了すると共に開閉弁V3を開放して残ガス処理を開始する(状態3)。 When the desorption amount in adsorption vessel A reaches a specified amount (for example, a value at which it is determined that the pressure of the desorbed gas is equal to or lower than the pressure of the low-temperature liquid 3 flowing through the gas-liquid mixer 19), as shown in FIG. 13, the on-off valves V6, V7, V9, and V12 are closed to end the desorption process, and the on-off valve V3 is opened to start processing the remaining gas (state 3).

脱着処理が終了した時点では、吸着容器Aには1MPa程度の圧力の脱着ガスが残存している。そこで開閉弁V3を開放することにより、高圧(1MPa)の吸着容器Aから低圧(0.1MPa)の循環ラインに残ガスが排出され、吸着容器A内が減圧される。
この時、吸着容器Bは循環ライン17を介して吸着処理を行っているので、循環ライン17に排出された吸着容器Aの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Bに移送され、吸着容器Bの吸着材に吸着される。
At the end of the desorption process, desorbed gas at a pressure of about 1 MPa remains in adsorption vessel A. By opening on-off valve V3, the remaining gas is discharged from the high-pressure (1 MPa) adsorption vessel A to the low-pressure (0.1 MPa) circulation line, and the pressure inside adsorption vessel A is reduced.
At this time, since adsorption vessel B is performing adsorption processing via circulation line 17, the residual gas from adsorption vessel A discharged into circulation line 17 is transferred to adsorption vessel B together with the evaporated gas circulating through circulation line 17, and is adsorbed by the adsorbent in adsorption vessel B.

吸着容器Bの吸着量が規定量に到達したら、図14に示すように、開閉弁V4、V5を閉止して吸着容器Bの吸着処理を終了すると共に、開閉弁V13、V14を開放して吸着容器Cの吸着処理を開始する。また、吸着処理を終了した吸着容器Bの脱着処理を開始する(状態4)。
吸着容器Bに代わって吸着容器Cが吸着処理を開始したことにより、循環ライン17に排出された吸着容器Aの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Cに移送され、吸着容器Cの吸着材に吸着される。吸着容器A内の圧力が循環ラインの圧力と同程度まで下がったら、開閉弁V3を閉止して残ガス処理を終了する。
14, when the adsorption amount in adsorption vessel B reaches a specified amount, the on-off valves V4 and V5 are closed to terminate the adsorption process in adsorption vessel B, and the on-off valves V13 and V14 are opened to start the adsorption process in adsorption vessel C. In addition, the desorption process is started for adsorption vessel B, which has completed the adsorption process (state 4).
As a result of adsorption vessel C starting the adsorption process instead of adsorption vessel B, the residual gas in adsorption vessel A discharged to the circulation line 17 is transferred to adsorption vessel C together with the evaporated gas circulating through the circulation line 17, and is adsorbed by the adsorbent in adsorption vessel C. When the pressure inside adsorption vessel A drops to approximately the same level as the pressure in the circulation line, on-off valve V3 is closed to terminate the residual gas process.

本実施の形態は、図8(b)の例と同様に、吸着容器Bの吸着処理の所要時間<(吸着容器Aの脱着処理の所要時間+残ガス処理の所要時間)であるが、上記のように、吸着容器Aで残ガス処理を行う間に吸着容器Bが吸着処理を完了しても、続いて吸着容器Cが吸着処理を行うので、吸着容器Aの残ガス処理が問題なく完了できる。したがって、図8(a)、図8(b)で説明したような問題が生じない。 In this embodiment, similar to the example in FIG. 8(b), the time required for the adsorption process in adsorption vessel B is less than (the time required for the desorption process in adsorption vessel A + the time required for the remaining gas process). However, as described above, even if adsorption vessel B completes its adsorption process while the remaining gas process is being carried out in adsorption vessel A, adsorption vessel C performs the adsorption process next, so the remaining gas process in adsorption vessel A can be completed without any problems. Therefore, the problems described in FIG. 8(a) and FIG. 8(b) do not occur.

吸着容器Bの脱着量が規定量(例えば脱着ガスの圧力が気液混合器19を通流する低温液体3の圧力以下になると判断される値)に到達したら、図15に示すように、脱着処理を終了し、開閉弁V5を開放して残ガス処理を開始する(状態5)。
この時、吸着容器Cが吸着処理を行っているので、循環ライン17に排出された吸着容器Bの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Cに移送され、吸着容器Cの吸着材に吸着される。
When the desorption amount in the adsorption vessel B reaches a specified amount (for example, a value at which it is determined that the pressure of the desorbed gas will be equal to or lower than the pressure of the cryogenic liquid 3 flowing through the gas-liquid mixer 19), as shown in FIG. 15, the desorption process is terminated, and the on-off valve V5 is opened to start processing the remaining gas (state 5).
At this time, since adsorption vessel C is performing adsorption processing, the residual gas in adsorption vessel B discharged to circulation line 17 is transferred to adsorption vessel C together with the evaporated gas circulating through circulation line 17, and is adsorbed by the adsorbent in adsorption vessel C.

吸着容器Cの吸着量が規定量に到達したら、図16に示すように、開閉弁V13、V14を閉止して吸着容器Cの吸着処理を終了すると共に、開閉弁V2、V3を開放して吸着容器Aの吸着処理を開始する。また、吸着処理を終了した吸着容器Cの脱着処理を開始する(状態6)。
吸着容器Cに代わって吸着容器Aが吸着処理を開始したことにより、循環ライン17に排出された吸着容器Bの残ガスは、循環ライン17を循環する蒸発ガスと共に吸着容器Aに移送され、吸着容器Aの吸着材に吸着される。吸着容器B内の圧力が循環ラインの圧力と同程度まで下がったら、開閉弁V5を閉止して残ガス処理を終了する。
16, when the adsorption amount in the adsorption vessel C reaches a specified amount, the on-off valves V13 and V14 are closed to terminate the adsorption process in the adsorption vessel C, and the on-off valves V2 and V3 are opened to start the adsorption process in the adsorption vessel A. In addition, the desorption process is started for the adsorption vessel C that has completed the adsorption process (state 6).
As a result of adsorption vessel A starting the adsorption process instead of adsorption vessel C, the residual gas in adsorption vessel B discharged to the circulation line 17 is transferred to adsorption vessel A together with the evaporated gas circulating through the circulation line 17, and is adsorbed by the adsorbent in adsorption vessel A. When the pressure inside adsorption vessel B drops to approximately the same level as the pressure in the circulation line, on-off valve V5 is closed to terminate the residual gas process.

吸着容器Cの脱着量が規定量(例えば脱着ガスの圧力が気液混合器19を通流する低温液体3の圧力以下になると判断される値)に到達したら、脱着処理を終了し、開閉弁V14を開放して残ガス処理を開始する。
吸着容器Cの残ガス処理も吸着容器A、Bと同様に行い、図17、図18に示すように、吸着容器Cの残ガスを循環ライン17を介して吸着容器A、Bに導入する(状態7、状態8)。
When the desorption amount in the adsorption vessel C reaches a specified amount (for example, a value at which it is determined that the pressure of the desorbed gas will be equal to or lower than the pressure of the low-temperature liquid 3 flowing through the gas-liquid mixer 19), the desorption process is terminated and the on-off valve V14 is opened to start processing the remaining gas.
The residual gas in the adsorption vessel C is treated in the same manner as in the adsorption vessels A and B, and as shown in Figures 17 and 18, the residual gas in the adsorption vessel C is introduced into the adsorption vessels A and B via the circulation line 17 (state 7, state 8).

以降、状態3~状態8を繰り返すことにより、三つの吸着容器9で吸着処理が交互に行われるので、貯槽5から連続的に蒸発ガスを抜き出すことができる。
また、一つの吸着容器9で残ガス処理を行う間に他の二つの吸着容器9のいずれかで吸着処理を行うので、一つの吸着容器9の残ガスを吸着処理中の他の二つの吸着容器9のいずれかに問題なく導入することができる。
Thereafter, by repeating states 3 to 8, the adsorption process is alternately performed in the three adsorption vessels 9, so that the evaporated gas can be continuously extracted from the storage tank 5.
In addition, while residual gas treatment is being performed in one of the adsorption vessels 9, adsorption treatment is being performed in one of the other two adsorption vessels 9, so that the residual gas in one of the adsorption vessels 9 can be introduced without any problems into one of the other two adsorption vessels 9 undergoing adsorption treatment.

上記は三つの吸着容器9を有する蒸発ガス処理システム33を用いたものであったが、本発明はこれに限定されるものではなく、四つ以上の吸着容器9を有する蒸発ガス処理システムを用いたものであってもよい。吸着容器9の数を増やすことによって、各吸着容器9の吸着処理時間がさらに短い場合などにも、問題なく残ガス処理を行うことができる。 The above describes the use of an evaporative gas processing system 33 having three adsorption vessels 9, but the present invention is not limited to this and may also use an evaporative gas processing system having four or more adsorption vessels 9. By increasing the number of adsorption vessels 9, residual gas processing can be carried out without problems even when the adsorption processing time of each adsorption vessel 9 is even shorter.

また、蒸発ガス処理システム1、33は、吸着処理の際に一つの吸着容器と熱交換器との間で蒸発ガスを循環させるものであったが、本発明はその限りではなく、二つ以上の吸着容器と熱交換器との間で蒸発ガスを循環させるものでもよい。これについて、図9の吸着容器Aが二つの吸着容器A1、A2、吸着容器Bが二つの吸着容器B1、B2、吸着容器Cが二つの吸着容器C1、C2から構成される場合、即ち、蒸発ガス処理システム33が合計で六つの吸着容器A1、A2、B1、B2、C1、C2を備えている場合を例にあげて以下説明する。
上記の例では、図11に示した状態1のとき、二つの吸着容器A1、A2が同時に吸着処理を行うので、循環ライン17を流れる蒸発ガスは二つの吸着容器A1、A2と熱交換器15との間で循環する。同様に、図12に示す状態2のときには、二つの吸着容器A1、A2が脱着処理を行う間に、循環ライン17によって二つの吸着容器B1、B2と熱交換器15との間で蒸発ガスが循環する。このように、二つ以上の吸着容器が同時に吸着処理を行うものも本発明に含まれる。
In addition, although the evaporative gas treatment systems 1 and 33 circulate the evaporative gas between one adsorption vessel and a heat exchanger during adsorption treatment, the present invention is not limited to this, and the evaporative gas may be circulated between two or more adsorption vessels and a heat exchanger. This will be described below as an example in which the adsorption vessel A in Fig. 9 is composed of two adsorption vessels A1 and A2 , the adsorption vessel B is composed of two adsorption vessels B1 and B2 , and the adsorption vessel C is composed of two adsorption vessels C1 and C2 , i.e., the evaporative gas treatment system 33 has a total of six adsorption vessels A1 , A2 , B1 , B2 , C1 , and C2 .
In the above example, in state 1 shown in Fig. 11, the two adsorption vessels A1 and A2 perform adsorption treatment simultaneously, so that the evaporated gas flowing through the circulation line 17 circulates between the two adsorption vessels A1 and A2 and the heat exchanger 15. Similarly, in state 2 shown in Fig. 12, while the two adsorption vessels A1 and A2 perform desorption treatment, the evaporated gas circulates through the circulation line 17 between the two adsorption vessels B1 and B2 and the heat exchanger 15. In this way, the present invention also includes cases where two or more adsorption vessels perform adsorption treatment simultaneously.

また、実施の形態1、2は、吸着材を加熱するための熱源として、気化ガスを用いる例であったが、例えば、海水やヒーターなどを用いて、吸着容器9を外部から加熱するようにしてもよく、その場合にも高い圧力の脱着ガスを得ることができる。
もっとも、前述したように、気化ガスを熱源として吸着容器9に導入することで、吸着材と直接接触して加熱することができるので、脱着工程の処理時間を短く抑えることができて好ましい。
In addition, while the first and second embodiments are examples in which vaporized gas is used as the heat source for heating the adsorbent, the adsorption vessel 9 may be heated from the outside using, for example, seawater or a heater, and in that case too, a desorbed gas at high pressure can be obtained.
However, as described above, by introducing the vaporized gas as a heat source into the adsorption vessel 9, the adsorbent can be heated by being in direct contact with it, and therefore the processing time of the desorption step can be kept short, which is preferable.

また、実施の形態1、2は、昇圧した脱着ガスを低温液体送出ライン13に導入する例であったが、脱着ガスの導入先はこれに限定されず、貯槽5内の圧力よりも高圧の他の系に脱着ガスを導入してもよい。低温液体送出ライン13以外の前記高圧の系としては、例えば、蒸発ガス処理システムが複数設置されているような場合において、脱着ガスを排出する蒸発ガス処理システムではない他の蒸発ガス処理システムの低温液体送出ライン、工場内あるいは工場周辺に設置されているガスホルダー、あるいは液化ガスを工場外に搬送するタンクローリーへの給液ラインなどが挙げられる。 In addition, in the first and second embodiments, the pressurized desorption gas is introduced into the low-temperature liquid delivery line 13, but the introduction destination of the desorption gas is not limited to this, and the desorption gas may be introduced into another system with a higher pressure than the pressure in the storage tank 5. Examples of the high-pressure system other than the low-temperature liquid delivery line 13 include, in a case where multiple evaporative gas treatment systems are installed, the low-temperature liquid delivery line of another evaporative gas treatment system that is not the evaporative gas treatment system that discharges the desorbed gas, a gas holder installed in or around a factory, or a liquid supply line to a tank truck that transports liquefied gas outside the factory.

また、実施の形態1、2は、循環ライン17における循環ブロワ27の上流に抜き出しライン7を接続して蒸発ガスを導入する例であったが、例えば、抜き出しライン7を各吸着容器9にそれぞれ接続して、吸着容器9に直接蒸発ガスを導入するようにしてもよい。
もっとも、前述したように、吸着容器9に導入する前に蒸発ガスを熱交換器15に通流させて冷却することで、より効率的に吸着材を冷却することができるので好ましい。
In addition, in the first and second embodiments, the extraction line 7 is connected to the circulation line 17 upstream of the circulation blower 27 to introduce the evaporated gas. However, for example, the extraction line 7 may be connected to each of the adsorption vessels 9, and the evaporated gas may be introduced directly into the adsorption vessels 9.
However, as described above, it is preferable to cool the evaporated gas by passing it through the heat exchanger 15 before it is introduced into the adsorption vessel 9, since this makes it possible to cool the adsorbent more efficiently.

さらに、実施の形態1、2における吸着処理、脱着処理、残ガス処理の実施に伴う各開閉弁の開閉操作を自動制御によって行ってもよい。各開閉弁を自動制御する場合には、吸着容器の温度、圧力および各ラインにおける低温液体及びガスの温度、圧力及び流量を検知して制御演算装置に入力し、該入力値に基づいて、吸着量や脱着量等を算出し、算出した吸着量や脱着量及び各入力値に基づいて各開閉弁を自動制御するとよい。 Furthermore, the opening and closing operations of each on-off valve associated with the adsorption process, desorption process, and residual gas process in the first and second embodiments may be performed by automatic control. When each on-off valve is automatically controlled, the temperature and pressure of the adsorption vessel and the temperature, pressure, and flow rate of the cryogenic liquid and gas in each line are detected and input to a control and calculation device, the adsorption amount, desorption amount, etc. are calculated based on the input values, and each on-off valve is automatically controlled based on the calculated adsorption amount, desorption amount, and each input value.

また、開閉弁V11は、例えばガス幹線の要求圧力以上の圧力で開く逆止弁としてもよい。その場合、設定圧力を境に開閉弁V11が自動開閉するため、開閉制御を不要とすることができる。 Also, the on-off valve V11 may be a check valve that opens at a pressure equal to or greater than the required pressure of the gas main line. In that case, the on-off valve V11 automatically opens and closes at the set pressure, eliminating the need for on-off control.

1 蒸発ガス処理システム(実施の形態1)
3 低温液体
5 貯槽
7 抜き出しライン
9 吸着容器
11 送出ポンプ
13 低温液体送出ライン
15 熱交換器
17 循環ライン
19 気液混合器
21 昇圧ポンプ
23 気化器
25 圧調弁
27 循環ブロワ
29 ガス供給ライン
31 脱着ガス供給ライン
31a 第1脱着ガス供給ライン
31b 第2脱着ガス供給ライン
33 蒸発ガス処理システム(実施の形態2)
V1~16 開閉弁
1 Evaporative gas processing system (Embodiment 1)
3 Cryogenic liquid 5 Storage tank 7 Withdrawal line 9 Adsorption vessel 11 Delivery pump 13 Cryogenic liquid delivery line 15 Heat exchanger 17 Circulation line 19 Gas-liquid mixer 21 Boost pump 23 Vaporizer 25 Pressure regulating valve 27 Circulation blower 29 Gas supply line 31 Desorption gas supply line 31a First desorption gas supply line 31b Second desorption gas supply line 33 Evaporative gas treatment system (Embodiment 2)
V1 to 16 On-off valve

Claims (3)

低温液体が貯留された貯槽から発生する蒸発ガスを抜き出す抜き出しラインと、
前記蒸発ガスを吸着する吸着材が収容された二つの吸着容器と、
前記貯槽から低温液体を送出する送出ポンプと、
該送出ポンプによって送出された低温液体が流れる低温液体送出ラインと、
該低温液体送出ラインに設けられて前記低温液体の冷熱を利用して熱交換する熱交換器と、
該熱交換器及び前記二つの吸着容器と接続され、前記抜き出しラインから抜き出された蒸発ガスを導入して前記二つの吸着容器のうち一つと前記熱交換器との間で循環させる循環ラインとを備えた蒸発ガス処理システムを用いて前記蒸発ガスを処理する蒸発ガス処理方法であって、
前記吸着容器のそれぞれにおいて、
前記循環ラインを通流する蒸発ガスを前記吸着材に吸着させる吸着処理と、
該吸着処理で吸着した蒸発ガスを加熱して前記吸着材から脱着させ、該脱着により昇圧した蒸発ガスを前記貯槽内の圧力よりも高圧の系又は前記低温液体送出ラインに導入する脱着処理と、
該脱着処理の後、吸着容器に残った残ガスを前記循環ラインに排出して吸着容器内を減圧する残ガス処理とを行うこととし、
前記二つの吸着容器で前記吸着処理を交互に行うことで前記貯槽から連続的に蒸発ガスを抜き出し、かつ、一方の吸着容器で前記吸着処理を行う間に他方の吸着容器で前記脱着処理及び前記残ガス処理を行うことで前記他方の吸着容器の残ガスを吸着処理中の前記一方の吸着容器に前記循環ラインを介して導入するようにしたことを特徴とする蒸発ガス処理方法。
an extraction line for extracting evaporated gas generated from a storage tank in which the cryogenic liquid is stored;
Two adsorption vessels each containing an adsorbent for adsorbing the evaporated gas;
a pump for pumping the cryogenic liquid from the storage tank;
a cryogenic liquid delivery line through which the cryogenic liquid delivered by the delivery pump flows;
a heat exchanger provided in the cryogenic liquid delivery line for exchanging heat by utilizing the cold of the cryogenic liquid;
an evaporation gas processing method for processing the evaporation gas using an evaporation gas processing system including a circulation line connected to the heat exchanger and the two adsorption vessels, the circulation line introducing the evaporation gas extracted from the extraction line and circulating the evaporation gas between one of the two adsorption vessels and the heat exchanger,
In each of the adsorption vessels,
an adsorption process in which the evaporated gas flowing through the circulation line is adsorbed by the adsorbent;
a desorption process in which the evaporated gas adsorbed in the adsorption process is heated to desorb it from the adsorbent, and the evaporated gas whose pressure has been increased by the desorption is introduced into a system having a higher pressure than the pressure in the storage tank or into the low-temperature liquid delivery line;
After the desorption process, a residual gas process is performed in which the residual gas remaining in the adsorption vessel is discharged to the circulation line and the inside of the adsorption vessel is depressurized,
The method for treating evaporated gas comprises alternately performing the adsorption process in the two adsorption vessels to continuously extract evaporated gas from the storage tank, and while the adsorption process is being performed in one adsorption vessel, the desorption process and the residual gas process are being performed in the other adsorption vessel, so that the residual gas in the other adsorption vessel is introduced via the circulation line into the one adsorption vessel undergoing the adsorption process.
低温液体が貯留された貯槽から発生する蒸発ガスを処理する蒸発ガス処理システムであって、
前記貯槽から発生する蒸発ガスを抜き出す抜き出しラインと、
前記蒸発ガスを吸着する吸着材が収容された三つ以上の吸着容器と、
前記貯槽から低温液体を送出する送出ポンプと、
該送出ポンプによって送出された低温液体が流れる低温液体送出ラインと、
該低温液体送出ラインに設けられて前記低温液体の冷熱を利用して熱交換する前記吸着容器とは別の熱交換器と、
該熱交換器及び前記三つ以上の吸着容器と接続され、前記抜き出しラインから抜き出された蒸発ガスを導入して前記三つ以上の吸着容器のうち少なくとも一つと前記熱交換器との間で循環させる循環ラインと、を備え、
前記抜き出しラインから抜き出された蒸発ガスは、前記循環ラインにおける前記熱交換器に送出される側に導入され、前記熱交換器で冷却されてから前記吸着容器に導入されて前記吸着材を冷却すると共に前記吸着材で吸着されることを特徴とする蒸発ガス処理システム。
An evaporation gas processing system for processing evaporation gas generated from a storage tank in which a cryogenic liquid is stored,
an extraction line for extracting evaporated gas generated from the storage tank;
three or more adsorption vessels each containing an adsorbent for adsorbing the evaporated gas;
a pump for pumping the cryogenic liquid from the storage tank;
a cryogenic liquid delivery line through which the cryogenic liquid delivered by the delivery pump flows;
a heat exchanger provided in the cryogenic liquid delivery line and configured to exchange heat by utilizing the cold heat of the cryogenic liquid, the heat exchanger being separate from the adsorption vessel ;
a circulation line connected to the heat exchanger and the three or more adsorption vessels, for introducing the evaporated gas extracted from the extraction line and circulating the evaporated gas between at least one of the three or more adsorption vessels and the heat exchanger,
The evaporative gas treatment system is characterized in that the evaporative gas extracted from the extraction line is introduced into the side of the circulation line that is sent to the heat exchanger, cooled in the heat exchanger, and then introduced into the adsorption vessel to cool the adsorbent and be adsorbed by the adsorbent .
請求項2に記載の蒸発ガス処理システムを用いて蒸発ガスを処理する蒸発ガス処理方法であって、
前記吸着容器のそれぞれにおいて、
前記循環ラインを通流する蒸発ガスを前記吸着材に吸着させる吸着処理と、
該吸着処理で吸着した蒸発ガスを加熱して前記吸着材から脱着させ、該脱着により昇圧した蒸発ガスを前記貯槽内の圧力よりも高圧の系又は前記低温液体送出ラインに導入する脱着処理と、
該脱着処理の後、吸着容器に残った残ガスを前記循環ラインに排出して吸着容器内を減圧する残ガス処理とを行うこととし、
前記三つ以上の吸着容器で前記吸着処理を順次行うことで前記貯槽から連続的に蒸発ガスを抜き出し、かつ、少なくとも一つの吸着容器で前記残ガス処理を行う間に残りの吸着容器のいずれかで前記吸着処理を行うことで前記一つの吸着容器の残ガスを吸着処理中の前記二つ以上の吸着容器のいずれかに前記循環ラインを介して導入するようにしたことを特徴とする蒸発ガス処理方法。
3. An evaporative gas processing method for processing evaporative gas using the evaporative gas processing system according to claim 2, comprising the steps of:
In each of the adsorption vessels,
an adsorption process in which the evaporated gas flowing through the circulation line is adsorbed by the adsorbent;
a desorption process in which the evaporated gas adsorbed in the adsorption process is heated to desorb it from the adsorbent, and the evaporated gas whose pressure has been increased by the desorption is introduced into a system having a higher pressure than the pressure in the storage tank or into the low-temperature liquid delivery line;
After the desorption process, a residual gas process is performed in which the residual gas remaining in the adsorption vessel is discharged to the circulation line and the inside of the adsorption vessel is depressurized,
An evaporative gas treatment method characterized in that the adsorption process is performed sequentially in the three or more adsorption vessels to continuously extract evaporative gas from the storage tank, and while the residual gas treatment is performed in at least one adsorption vessel, the adsorption process is performed in any of the remaining adsorption vessels, so that the residual gas in one of the adsorption vessels is introduced via the circulation line to any of the two or more adsorption vessels undergoing the adsorption process.
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