JP2020170691A - Hydrogen utilization system and hydrogen utilization method - Google Patents
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本発明は、水素吸蔵合金を利用した水素利用システム及び水素利用方法に関する。 The present invention relates to a hydrogen utilization system and a hydrogen utilization method using a hydrogen storage alloy.
２０１４年４月に閣議決定されたエネルギー基本計画において、水素を日常の生活や産業活動で利活用する「水素社会」の実現に向け取り組みを加速することが定められ、国や東京都では２０２０年東京五輪での水素の積極活用、その後の水素社会普及に向けた動きが活発化している。２０１２年７月の再生可能エネルギーの固定価格買取制度（ＦＩＴ）の導入は、非住宅用の太陽光発電市場（公共・産業分野）を大きく変えることとなった。ＪＰＥＡ ＰＶ ＯＵＴＬＯＯＫ ２０３０によると、国内総出荷に占める非住宅用の割合は、２０１２年度で（国内総出荷量３．８ＧＷに対し）５０％、２０１３年度で（同８．４ＧＷに対し）７３％、２０１４年度上半期で（上期国内総出荷量４．３ＧＷに対し）７７％と大幅に伸張している。 The Basic Energy Plan, which was approved by the Cabinet in April 2014, stipulates that efforts to accelerate efforts toward the realization of a "hydrogen society" that utilizes hydrogen in daily life and industrial activities will be accelerated. The active utilization of hydrogen at the Tokyo Olympics and the subsequent movement toward the spread of hydrogen society are becoming active. The introduction of the feed-in tariff (FIT) for renewable energy in July 2012 has significantly changed the non-residential photovoltaic power generation market (public / industrial sector). According to JPEA PV OUTLOOK 2030, the ratio of non-residential use to the total domestic shipment was 50% in 2012 (relative to the total domestic shipment of 3.8 GW) and 73% in 2013 (relative to 8.4 GW). In the first half of 2014 (compared to the total domestic shipment of 4.3 GW in the first half), it increased significantly to 77%.
太陽光発電の大量の設備認定量に伴い、それらが全て稼動した場合、電力需要の小さい軽負荷期に太陽光発電の供給電力量が需要電力量を上回る懸念が出てきたため、指定電気事業者において「無制限・無補償の出力抑制」を条件として系統接続を行うこととなった。今後、更なる太陽光発電の系統接続量の増加に伴い、電力需給調整を目的とした出力抑制の実施は現実のものとなる。 With the large amount of certified equipment for photovoltaic power generation, if all of them are in operation, there is a concern that the amount of power supplied by photovoltaic power generation will exceed the amount of power demand during the light load period when power demand is low, so designated electric power companies In, it was decided to make a grid connection on the condition of "unlimited and uncompensated output suppression". In the future, with the further increase in the amount of photovoltaic power generation grid connections, it will become a reality to implement output curtailment for the purpose of adjusting the supply and demand of electricity.
出力抑制が実施されると、その分の再生可能エネルギーは捨てられてしまうため、エネルギーの効率的な利用という観点から見ると、蓄電池等を用いて捨てる分のエネルギー（以下、余剰電力と呼ぶ）は貯蔵しておくことが望ましい。余剰電力の貯蔵手段として、近年注目されているのが水素である。蓄電池による貯蔵に比べると、電気から水素への変換、また水素から電気への変換に伴う効率低下が大きいというデメリットはあるが、大容量、長期的なエネルギー貯蔵に適している。 When output suppression is implemented, that amount of renewable energy is discarded, so from the perspective of efficient use of energy, the amount of energy that is discarded using storage batteries, etc. (hereinafter referred to as surplus power). Is desirable to store. Hydrogen has been attracting attention in recent years as a means of storing surplus electricity. Compared to storage with a storage battery, it has the disadvantage of a large decrease in efficiency due to the conversion of electricity to hydrogen and the conversion of hydrogen to electricity, but it is suitable for large-capacity, long-term energy storage.
電力を使用して水素を製造・貯蔵・利用（発電）するシステムとしては、例えば特許文献１に記載されているシステムがある。このシステムは、電力系統に連系された需要家に水素製造装置、水素貯蔵装置、燃料電池、負荷モニタ装置、監視制御装置を設け、需要予測、負荷変動に基づき水素を製造・貯蔵・利用するシステムである。 As a system for producing, storing, and utilizing (generating electricity) hydrogen using electric power, for example, there is a system described in Patent Document 1. This system is equipped with hydrogen production equipment, hydrogen storage equipment, fuel cells, load monitoring equipment, and monitoring control equipment for consumers connected to the power system, and produces, stores, and uses hydrogen based on demand forecasts and load fluctuations. It is a system.
特許文献１に示されているようなシステムでは、水素をコンパクトかつ安全に貯蔵するために水素吸蔵合金を利用することも挙げられている。しかしながら、一般的な水素吸蔵合金は着火すると燃えるため、消防法上の危険物に該当する。消防法の危険物に該当しない水素吸蔵合金として、粘性が比較的高く微粉化しにくいＴｉＦｅ系の合金に少量の第三、第四元素を付与した合金を用いる方法がある。しかしながら、このような合金を用いると、温度帯の管理と熱の有効利用が困難になる。すなわち、図５は、ＴｉＦｅ系の水素吸蔵合金の一例のＰＣＴ（Pressure Composition Temperature）線図である。図において、横軸は水素組成（水素原子Ｈと金属原子Ｍの比）を示し、縦軸は平衡水素圧を示す。この例では、摂氏２０度と、摂氏３０度と、摂氏６０度のときのＰＣＴ線図が示されている。図５に示すように、ＴｉＦｅ系の水素吸蔵合金では、ＰＣＴ線図上で圧力がプラトーになる領域が少なく、また吸放出時の圧力ヒステリシスも大きい。このため、省エネルギーで水素の吸放出を行うためには、広い温度帯の管理と熱の有効利用が必要となる。具体的には吸蔵時には摂氏２０度程度、放出時には摂氏６０度程度に管理することが望ましい。 In a system as shown in Patent Document 1, it is also mentioned that a hydrogen storage alloy is used to store hydrogen compactly and safely. However, since a general hydrogen storage alloy burns when ignited, it falls under the category of dangerous goods under the Fire Service Act. As a hydrogen storage alloy that does not fall under the dangerous goods of the Fire Service Act, there is a method of using an alloy in which a small amount of the third and fourth elements is added to a TiFe-based alloy having a relatively high viscosity and being difficult to be pulverized. However, when such an alloy is used, it becomes difficult to control the temperature zone and effectively utilize heat. That is, FIG. 5 is a PCT (Pressure Composition Temperature) diagram of an example of a TiFe-based hydrogen storage alloy. In the figure, the horizontal axis shows the hydrogen composition (ratio of hydrogen atom H and metal atom M), and the vertical axis shows the equilibrium hydrogen pressure. In this example, PCT diagrams at 20 degrees Celsius, 30 degrees Celsius, and 60 degrees Celsius are shown. As shown in FIG. 5, in the TiFe-based hydrogen storage alloy, there are few regions where the pressure becomes a plateau on the PCT diagram, and the pressure hysteresis during absorption and release is also large. Therefore, in order to absorb and release hydrogen with energy saving, it is necessary to manage a wide temperature range and effectively use heat. Specifically, it is desirable to control the temperature at about 20 degrees Celsius at the time of occlusion and at about 60 degrees Celsius at the time of release.
上述の課題を鑑み、本発明は、広い温度帯において効率的に適温に設定して水素吸蔵合金の吸蔵及び放出が行える水素利用システム及び水素利用方法を提供することを目的とする。 In view of the above problems, it is an object of the present invention to provide a hydrogen utilization system and a hydrogen utilization method capable of efficiently setting an appropriate temperature in a wide temperature range to store and release a hydrogen storage alloy.
上述の課題を鑑み、本発明の一態様に係る水素利用システムは、水素吸蔵合金が封入される水素吸蔵合金タンクと、熱媒水を蓄える蓄熱槽と、冷熱源と、燃料電池と、制御装置とを有する水素利用システムであって、前記制御装置は、水素を吸蔵する場合において、前記蓄熱槽の下部に蓄えられた冷水と、前記蓄熱槽の上部に蓄えられた温水を前記冷熱源によって冷却して生成された冷水とを混合して前記水素吸蔵合金タンクに供給して冷却し、前記水素吸蔵合金タンクからの戻りの冷水を前記蓄熱槽の下部に戻す制御を行う冷却制御部と、水素を放出する場合において、前記蓄熱槽の上部に蓄えられた温水と、前記蓄熱槽の下部に蓄えられた冷水を前記燃料電池によって加熱して生成された温水とを混合して前記水素吸蔵合金タンクに供給して加温し、前記水素吸蔵合金タンクからの戻りの温水を前記蓄熱槽の上部に戻す制御を行う加温制御部と、を有する。 In view of the above problems, the hydrogen utilization system according to one aspect of the present invention includes a hydrogen storage alloy tank in which a hydrogen storage alloy is sealed, a heat storage tank for storing heat medium, a cold heat source, a fuel cell, and a control device. The control device is a hydrogen utilization system having the above, and in the case of storing hydrogen, the cold water stored in the lower part of the heat storage tank and the hot water stored in the upper part of the heat storage tank are cooled by the cold heat source. A cooling control unit that mixes the cold water generated in the above process and supplies it to the hydrogen storage alloy tank for cooling, and controls the return of the cold water returned from the hydrogen storage alloy tank to the lower part of the heat storage tank, and hydrogen. The hydrogen storage alloy tank is a mixture of hot water stored in the upper part of the heat storage tank and hot water generated by heating cold water stored in the lower part of the heat storage tank by the fuel cell. It has a heating control unit that controls the hot water returned from the hydrogen storage alloy tank to be returned to the upper part of the heat storage tank.
本発明の一態様に係る水素利用方法は、水素吸蔵合金タンクに水素吸蔵合金を封入して水素を貯蔵する水素利用方法であって、熱媒水を蓄える蓄熱槽を設け、前記蓄熱槽の下部に蓄えられた冷水と、前記蓄熱槽の上部に蓄えられた温水を冷熱源によって冷却して生成された冷水とを混合して前記水素吸蔵合金タンクに供給し、前記水素吸蔵合金タンクからの戻りの冷水を前記蓄熱槽の下部に戻すことで、前記水素吸蔵合金タンクに封入された水素吸蔵合金に水素を吸蔵させる冷却工程と、前記蓄熱槽の上部に蓄えられた温水と、前記蓄熱槽の下部に蓄えられた冷水を燃料電池によって加熱して生成された温水とを混合して前記水素吸蔵合金タンクに供給し、前記水素吸蔵合金タンクからの戻りの温水を前記蓄熱槽の上部に戻すことで、前記水素吸蔵合金タンクに封入された水素吸蔵合金から水素を放出させる加温工程と、を含む。 The hydrogen utilization method according to one aspect of the present invention is a hydrogen utilization method in which a hydrogen storage alloy is sealed in a hydrogen storage alloy tank to store hydrogen, and a heat storage tank for storing heat medium is provided and a lower portion of the heat storage tank is provided. The cold water stored in the hydrogen storage alloy tank and the cold water generated by cooling the hot water stored in the upper part of the heat storage tank with a cold heat source are mixed and supplied to the hydrogen storage alloy tank, and returned from the hydrogen storage alloy tank. By returning the cold water to the lower part of the heat storage tank, a cooling step of storing hydrogen in the hydrogen storage alloy sealed in the hydrogen storage alloy tank, hot water stored in the upper part of the heat storage tank, and the heat storage tank The cold water stored in the lower part is mixed with the hot water generated by heating by the fuel cell and supplied to the hydrogen storage alloy tank, and the hot water returned from the hydrogen storage alloy tank is returned to the upper part of the heat storage tank. The heating step of releasing hydrogen from the hydrogen storage alloy sealed in the hydrogen storage alloy tank is included.
本発明によれば、幅広い温度帯で厳しい温度管理が必要な水素吸蔵合金を扱う場合でも、効率的に熱利用が行え、適切な管理を行うことができる。また、本発明によれば、様々な温度差、流量を要する各装置を最低限の構成で実現可能であり、コストの低減を図ることができる。 According to the present invention, even when a hydrogen storage alloy that requires strict temperature control in a wide temperature range is handled, heat can be efficiently used and appropriate control can be performed. Further, according to the present invention, it is possible to realize each device requiring various temperature differences and flow rates with the minimum configuration, and it is possible to reduce the cost.
以下、本発明の実施の形態について図面を参照しながら説明する。図１は、本発明の実施形態に係る水素利用システム１の熱系統の構成を示す図である。図１に示すように、本発明の実施形態に係る水素利用システム１は、水素吸蔵合金タンク１０と、蓄熱槽１１と、冷熱源１２と、燃料電池１３と、三方弁１４と、ポンプ１５及び１６と、制御装置１７と、電磁弁２１〜３０とから構成される。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a thermal system of the hydrogen utilization system 1 according to the embodiment of the present invention. As shown in FIG. 1, the hydrogen utilization system 1 according to the embodiment of the present invention includes a hydrogen storage alloy tank 10, a heat storage tank 11, a cold heat source 12, a fuel cell 13, a three-way valve 14, a pump 15, and the like. It is composed of 16, a control device 17, and solenoid valves 21 to 30.
水素吸蔵合金タンク１０には水素吸蔵合金が封入されている。水素吸蔵合金タンク１０に封入される水素吸蔵合金としては、粘性が高く微粉化しにくい水素吸蔵合金、例えばＴｉＦｅ系の合金に第三、第四元素を付与した合金を用いることができる。水素吸蔵合金タンク１０内の水素吸蔵合金は、冷却により水素吸蔵が開始され、加温により水素放出が開始される。一例として、水素吸蔵合金タンク１０内の水素吸蔵合金は、摂氏２０度程度で吸蔵となり、摂氏６０度程度で放出となる。なお、水素吸蔵合金は、ＴｉＦｅ系の合金に限定されるものではない。 A hydrogen storage alloy is sealed in the hydrogen storage alloy tank 10. As the hydrogen storage alloy sealed in the hydrogen storage alloy tank 10, a hydrogen storage alloy having high viscosity and difficult to be pulverized, for example, a TiFe-based alloy to which the third and fourth elements are added can be used. The hydrogen storage alloy in the hydrogen storage alloy tank 10 starts hydrogen storage by cooling and hydrogen release by heating. As an example, the hydrogen storage alloy in the hydrogen storage alloy tank 10 is stored at about 20 degrees Celsius and released at about 60 degrees Celsius. The hydrogen storage alloy is not limited to TiFe-based alloys.
蓄熱槽１１は、熱媒水を一時的に蓄えて蓄熱する。本実施形態では、後に説明するように、水素吸蔵合金タンク１０に送られる経路の熱媒水の流量と、冷熱源１２や燃料電池１３で冷却或いは加熱される経路の熱媒水の流量とが異なっている。蓄熱槽１１は、このような異なる流量の経路を混在させるために設けられている。 The heat storage tank 11 temporarily stores heat medium and stores heat. In the present embodiment, as will be described later, the flow rate of the heat medium in the path sent to the hydrogen storage alloy tank 10 and the flow rate of the heat medium in the path cooled or heated by the cold heat source 12 or the fuel cell 13 are different. It's different. The heat storage tank 11 is provided to mix such different flow rate paths.
冷熱源１２は、熱媒水を冷却する。燃料電池１３は、水素と酸素を反応させて発電を行う。また、燃料電池１３は、発電の際に生じる熱によって、熱媒水を加熱する。 The cold heat source 12 cools the heat medium. The fuel cell 13 generates electricity by reacting hydrogen and oxygen. Further, the fuel cell 13 heats the heat medium by the heat generated during power generation.
三方弁１４は、冷熱源１２や燃料電池１３により冷却或いは加熱された熱媒水と、蓄熱槽１１の上方又は下方からの熱媒水とを混合することで、熱媒水の水量を増量させポンプ１５に供給する。ポンプ１５は、三方弁１４で混合した熱媒水を水素吸蔵合金タンク１０に供給する。ポンプ１６は、蓄熱槽１１からの熱媒水を冷熱源１２や燃料電池１３に供給する。 The three-way valve 14 increases the amount of heat medium water by mixing the heat medium water cooled or heated by the cold heat source 12 or the fuel cell 13 with the heat medium water from above or below the heat storage tank 11. It is supplied to the pump 15. The pump 15 supplies the heat medium water mixed by the three-way valve 14 to the hydrogen storage alloy tank 10. The pump 16 supplies the heat medium from the heat storage tank 11 to the cold heat source 12 and the fuel cell 13.
制御装置１７は、水素吸蔵時と水素放出時とに応じて、電磁弁２１〜３０を開閉制御する。すなわち、制御装置１７は、電磁弁２１〜３０を開閉制御することにより、水素を吸蔵する場合に、蓄熱槽１１の下部に蓄えられた冷水と、蓄熱槽１１の上部に蓄えられた温水を冷熱源１２によって冷却して生成された冷水とを混合して水素吸蔵合金タンク１０に供給して冷却し、水素吸蔵合金タンク１０からの戻りの冷水を蓄熱槽１１の下部に戻す制御を行う冷却制御部を実現する。また、制御装置１７は、電磁弁２１〜３０を開閉制御することにより、水素を放出する場合に、蓄熱槽１１の上部に蓄えられた温水と、蓄熱槽１１の下部に蓄えられた冷水を燃料電池１３によって加熱して生成された温水とを混合して水素吸蔵合金タンク１０に供給して加温し、水素吸蔵合金タンク１０からの戻りの温水を蓄熱槽１１の上部に戻す制御を行う加温制御部とを実現する。 The control device 17 controls the opening and closing of the solenoid valves 21 to 30 according to the time of hydrogen storage and the time of hydrogen release. That is, the control device 17 cools the cold water stored in the lower part of the heat storage tank 11 and the hot water stored in the upper part of the heat storage tank 11 when hydrogen is occluded by controlling the opening and closing of the electromagnetic valves 21 to 30. Cooling control that controls to mix the cold water generated by cooling by the source 12 and supply it to the hydrogen storage alloy tank 10 to cool it, and return the cold water returning from the hydrogen storage alloy tank 10 to the lower part of the heat storage tank 11. Realize the department. Further, the control device 17 uses hot water stored in the upper part of the heat storage tank 11 and cold water stored in the lower part of the heat storage tank 11 as fuel when hydrogen is released by controlling the opening and closing of the solenoid valves 21 to 30. The hot water generated by heating by the battery 13 is mixed and supplied to the hydrogen storage alloy tank 10 to heat it, and the hot water returned from the hydrogen storage alloy tank 10 is controlled to be returned to the upper part of the heat storage tank 11. Realizes a temperature control unit.
電磁弁２１及び２２は、水素吸蔵合金タンク１０からの戻り水を蓄熱槽１１の上部に戻すか、又は蓄熱槽１１の下部に戻すかに応じて、開または閉状態となる。ここでは電磁弁２１は、蓄熱槽１１の深さ方向のうち下部側に連結された配管に接続されており、電磁弁２２は、蓄熱槽１１の深さ方向のうち上部側に連結された配管に接続されている。すなわち、電磁弁２１が「開」状態で、電磁弁２２が「閉」状態なら、水素吸蔵合金タンク１０からの戻り水は、蓄熱槽１１の下部に戻される。電磁弁２２が「開」状態で、電磁弁２１が「閉」状態なら、水素吸蔵合金タンク１０からの戻り水は、蓄熱槽１１の上部に戻される。蓄熱槽１１における熱媒水は、蓄熱槽１１の深さ方向において上部側は、下部側に比べて温度が高く、蓄熱槽１１の下部側は、上部側に比べて温度が低い状態となる。 The solenoid valves 21 and 22 are opened or closed depending on whether the return water from the hydrogen storage alloy tank 10 is returned to the upper part of the heat storage tank 11 or the lower part of the heat storage tank 11. Here, the solenoid valve 21 is connected to a pipe connected to the lower side in the depth direction of the heat storage tank 11, and the solenoid valve 22 is connected to the pipe connected to the upper side in the depth direction of the heat storage tank 11. It is connected to the. That is, when the solenoid valve 21 is in the "open" state and the solenoid valve 22 is in the "closed" state, the return water from the hydrogen storage alloy tank 10 is returned to the lower part of the heat storage tank 11. When the solenoid valve 22 is in the “open” state and the solenoid valve 21 is in the “closed” state, the return water from the hydrogen storage alloy tank 10 is returned to the upper part of the heat storage tank 11. The temperature of the heat medium in the heat storage tank 11 is higher on the upper side than on the lower side in the depth direction of the heat storage tank 11, and is lower on the lower side of the heat storage tank 11 than on the upper side.
電磁弁２３及び２４は、ポンプ１６へ供給する熱媒水を、蓄熱槽１１の上部から取り出すか、又は蓄熱槽１１の下部から取り出すかに応じて、開または閉状態となる。ここでは電磁弁２３は、蓄熱槽１１の深さ方向のうち上部側に連結された配管に接続されており、電磁弁２４は、蓄熱槽１１の深さ方向のうち下部側に連結された配管に接続されている。すなわち、電磁弁２３が「開」状態で、電磁弁２４が「閉」状態なら、蓄熱槽１１の上部から熱媒水が取り出される。電磁弁２４が「開」状態で、電磁弁２３が「閉」状態なら、蓄熱槽１１の下部から熱媒水が取り出される。 The solenoid valves 23 and 24 are opened or closed depending on whether the heat medium water supplied to the pump 16 is taken out from the upper part of the heat storage tank 11 or from the lower part of the heat storage tank 11. Here, the solenoid valve 23 is connected to a pipe connected to the upper side in the depth direction of the heat storage tank 11, and the solenoid valve 24 is connected to a pipe connected to the lower side in the depth direction of the heat storage tank 11. It is connected to the. That is, when the solenoid valve 23 is in the "open" state and the solenoid valve 24 is in the "closed" state, the heat transfer water is taken out from the upper part of the heat storage tank 11. When the solenoid valve 24 is in the "open" state and the solenoid valve 23 is in the "closed" state, the heat medium is taken out from the lower part of the heat storage tank 11.
電磁弁２５及び２６は、ポンプ１６から送り出された熱媒水を冷熱源１２で冷却するか否かに応じて、開または閉状態となる。ここでは電磁弁２５は、冷熱源１２に連結された配管に接続されており、電磁弁２６は、冷熱源１２の出口側に連結された配管に接続されている。すなわち、電磁弁２５が「開」状態で、電磁弁２６が「閉」状態なら、ポンプ１６から送り出された熱媒水は冷熱源１２に供給されることで冷熱源１２によって冷却される。電磁弁２６が「開」状態で、電磁弁２５が「閉」状態なら、ポンプ１６から送り出された熱媒水は冷熱源１２には供給されずに、冷熱源１２の下流側（出口側）に供給されるため、冷熱源１２による冷却はされない。 The solenoid valves 25 and 26 are opened or closed depending on whether or not the heat medium water sent from the pump 16 is cooled by the cold heat source 12. Here, the solenoid valve 25 is connected to a pipe connected to the cold heat source 12, and the solenoid valve 26 is connected to a pipe connected to the outlet side of the cold heat source 12. That is, when the solenoid valve 25 is in the "open" state and the solenoid valve 26 is in the "closed" state, the heat medium water sent out from the pump 16 is supplied to the cold heat source 12 and cooled by the cold heat source 12. When the solenoid valve 26 is in the "open" state and the solenoid valve 25 is in the "closed" state, the heat medium water sent from the pump 16 is not supplied to the cold heat source 12, but is downstream (outlet side) of the cold heat source 12. Is not cooled by the cold heat source 12.
電磁弁２７及び２８は、ポンプ１６から送り出された熱媒水を燃料電池１３で加熱するか否かに応じて、開または閉状態となる。ここでは電磁弁２８は、燃料電池１３に連結された配管に接続されており、電磁弁２７は、燃料電池１３の出口側に連結された配管に接続されている。すなわち、電磁弁２８が「開」状態で、電磁弁２７が「閉」状態なら、ポンプ１６から送り出された熱媒水は燃料電池１３に供給されることで、燃料電池１３からの熱によって加熱される。電磁弁２７が「開」状態で、電磁弁２８が「閉」状態なら、ポンプ１６から送り出された熱媒水は燃料電池１３には供給されずに、燃料電池１３の下流側（出口側）に供給されるため、燃料電池１３による加熱はされない。 The solenoid valves 27 and 28 are opened or closed depending on whether or not the heat medium water delivered from the pump 16 is heated by the fuel cell 13. Here, the solenoid valve 28 is connected to a pipe connected to the fuel cell 13, and the solenoid valve 27 is connected to a pipe connected to the outlet side of the fuel cell 13. That is, when the solenoid valve 28 is in the "open" state and the solenoid valve 27 is in the "closed" state, the heat medium water sent from the pump 16 is supplied to the fuel cell 13 and heated by the heat from the fuel cell 13. Will be done. When the solenoid valve 27 is in the "open" state and the solenoid valve 28 is in the "closed" state, the heat medium water sent from the pump 16 is not supplied to the fuel cell 13 and is downstream (outlet side) of the fuel cell 13. Is not heated by the fuel cell 13 because it is supplied to the fuel cell 13.
電磁弁２９及び３０は、冷熱源１２や燃料電池１３により冷却或いは加熱された熱媒水と蓄熱槽１１に蓄積されている熱媒水とを混合する際に、蓄熱槽１１の上部からの熱媒水と混合するか、又は蓄熱槽１１の下部からの熱媒水と混合するかに応じて、開または閉状態となる。ここでは電磁弁２９は、蓄熱槽１１の深さ方向のうち下部側に連結された配管に接続されており、電磁弁３０は、蓄熱槽１１の深さ方向のうち上部側に連結された配管に接続されている。すなわち、電磁弁２９が「開」状態で、電磁弁３０が「閉」状態なら、冷熱源１２や燃料電池１３により冷却或いは加熱された熱媒水は、三方弁１４によって蓄熱槽１１の下部側から取り出された熱媒水と混合され、ポンプ１５に供給され、ポンプ１５から水素吸蔵合金タンク１０に送られる。電磁弁３０が「開」状態で、電磁弁２９が「閉」状態なら、冷熱源１２や燃料電池１３により冷却或いは加熱された熱媒水は、三方弁１４によって蓄熱槽１１の上部から取り出された熱媒水と混合され、ポンプ１５に供給され、ポンプ１５から水素吸蔵合金タンク１０に送られる。 The electromagnetic valves 29 and 30 heat from the upper part of the heat storage tank 11 when the heat medium water cooled or heated by the cold heat source 12 or the fuel cell 13 and the heat medium water stored in the heat storage tank 11 are mixed. It is opened or closed depending on whether it is mixed with the water medium or the heat medium from the lower part of the heat storage tank 11. Here, the solenoid valve 29 is connected to a pipe connected to the lower side in the depth direction of the heat storage tank 11, and the solenoid valve 30 is connected to the pipe connected to the upper side in the depth direction of the heat storage tank 11. It is connected to the. That is, when the solenoid valve 29 is in the "open" state and the solenoid valve 30 is in the "closed" state, the heat medium cooled or heated by the cold heat source 12 or the fuel cell 13 is on the lower side of the heat storage tank 11 by the three-way valve 14. It is mixed with the heat medium water taken out from, supplied to the pump 15, and sent from the pump 15 to the hydrogen storage alloy tank 10. When the solenoid valve 30 is in the "open" state and the solenoid valve 29 is in the "closed" state, the heat medium cooled or heated by the cold heat source 12 or the fuel cell 13 is taken out from the upper part of the heat storage tank 11 by the three-way valve 14. It is mixed with the heat medium, supplied to the pump 15, and sent from the pump 15 to the hydrogen storage alloy tank 10.
次に、本発明の実施形態に係る水素利用システム１の水素吸蔵時の熱系統の処理について説明する。 Next, the treatment of the heat system at the time of hydrogen storage of the hydrogen utilization system 1 according to the embodiment of the present invention will be described.
水素吸蔵時には、電磁弁２１〜３０は、制御装置１７により以下のように開閉制御され、冷却制御が行われる。すなわち、電磁弁２１が「開」状態、電磁弁２２が「閉」状態に設定される。電磁弁２３が「開」状態、電磁弁２４が「閉」状態に設定される。電磁弁２５が「開」状態、電磁弁２６が「閉」状態に設定される。電磁弁２７が「開」状態、電磁弁２８が「閉」状態に設定される。電磁弁２９が「開」状態、電磁弁３０が「閉」状態に設定される。 At the time of hydrogen storage, the solenoid valves 21 to 30 are controlled to open and close by the control device 17 as follows, and cooling control is performed. That is, the solenoid valve 21 is set to the "open" state, and the solenoid valve 22 is set to the "closed" state. The solenoid valve 23 is set to the "open" state, and the solenoid valve 24 is set to the "closed" state. The solenoid valve 25 is set to the "open" state, and the solenoid valve 26 is set to the "closed" state. The solenoid valve 27 is set to the “open” state, and the solenoid valve 28 is set to the “closed” state. The solenoid valve 29 is set to the "open" state, and the solenoid valve 30 is set to the "closed" state.
図１において、水素吸蔵時には、電磁弁２３が「開」状態となり、電磁弁２４が「閉」状態となるため、蓄熱槽１１の上部の温水が電磁弁２３を介してポンプ１６に送られる。このとき、電磁弁２５が「開」状態であり、電磁弁２６が「閉」状態である。また、電磁弁２７が「開」状態であり、電磁弁２８が「閉」状態である。このため、ポンプ１６から送り出された温水は、冷熱源１２により冷却されて冷水となり、三方弁１４に送られる。このとき、電磁弁２９が「開」状態となり、電磁弁３０が「閉」状態となる。このため、冷熱源１２からの冷水は、三方弁１４により蓄熱槽１１の下部の冷水と混合され、ポンプ１５を介して、水素吸蔵合金タンク１０に送られる。水素吸蔵合金タンク１０内では、ポンプ１５から冷水を送ることで、水素吸蔵が行われる。このとき、電磁弁２１が「開」状態となり、電磁弁２２が「閉」状態となる。このため、水素吸蔵合金タンク１０からの戻りの冷水は、蓄熱槽１１の下部に戻される。 In FIG. 1, since the solenoid valve 23 is in the “open” state and the solenoid valve 24 is in the “closed” state during hydrogen storage, hot water in the upper part of the heat storage tank 11 is sent to the pump 16 via the solenoid valve 23. At this time, the solenoid valve 25 is in the "open" state, and the solenoid valve 26 is in the "closed" state. Further, the solenoid valve 27 is in the "open" state, and the solenoid valve 28 is in the "closed" state. Therefore, the hot water sent out from the pump 16 is cooled by the cold heat source 12 to become cold water, and is sent to the three-way valve 14. At this time, the solenoid valve 29 is in the "open" state, and the solenoid valve 30 is in the "closed" state. Therefore, the cold water from the cold heat source 12 is mixed with the cold water in the lower part of the heat storage tank 11 by the three-way valve 14 and sent to the hydrogen storage alloy tank 10 via the pump 15. In the hydrogen storage alloy tank 10, hydrogen storage is performed by sending cold water from the pump 15. At this time, the solenoid valve 21 is in the "open" state and the solenoid valve 22 is in the "closed" state. Therefore, the cold water returned from the hydrogen storage alloy tank 10 is returned to the lower part of the heat storage tank 11.
図２は、本発明の実施形態に係る水素利用システムにおける水素吸蔵時の熱系統の構成を示す図である。この図は、図１に示す経路から、電磁弁２２、２４、２６、２８、３０を閉じることにより流路が形成されない部分を削除したものである。 FIG. 2 is a diagram showing a configuration of a heat system at the time of hydrogen storage in the hydrogen utilization system according to the embodiment of the present invention. In this figure, the portion where the flow path is not formed by closing the solenoid valves 22, 24, 26, 28, and 30 is deleted from the path shown in FIG.
図２に示すように、水素吸蔵時には、蓄熱槽１１の上部に蓄えられた温水は、冷熱源１２により冷却され、三方弁１４で蓄熱槽１１の下部に蓄えられた冷水と混合して増量され、水素吸蔵合金タンク１０に送られる。水素吸蔵合金タンク１０内では、水素吸蔵合金が冷却され、水素の吸蔵が行われる。そして、水素吸蔵合金タンク１０からの戻り水は、蓄熱槽１１の下部に戻される。 As shown in FIG. 2, during hydrogen storage, the hot water stored in the upper part of the heat storage tank 11 is cooled by the cold heat source 12, and is mixed with the cold water stored in the lower part of the heat storage tank 11 by the three-way valve 14 to increase the amount. , Is sent to the hydrogen storage alloy tank 10. In the hydrogen storage alloy tank 10, the hydrogen storage alloy is cooled and hydrogen is stored. Then, the return water from the hydrogen storage alloy tank 10 is returned to the lower part of the heat storage tank 11.
本実施形態では、三方弁１４により、冷熱源１２により冷却された冷水と蓄熱槽１１の下部に蓄えられた冷水と混合することで、水素吸蔵合金タンク１０に大流量の熱媒水を流している。したがって、水素吸蔵合金タンク１０からの戻り水の温度は大きく上昇しない。このため、水素吸蔵合金タンク１０からの戻り水を蓄熱槽１１の下部に戻している。また、冷熱源１２に送られる熱媒水は低流量である。このため、冷熱源１２の入口の熱媒水の温度と、冷熱源１２の出口の熱媒水の温度との差を大きくすることができ、熱媒水の温度を効率的に適温に設定できる。 In the present embodiment, the three-way valve 14 mixes the cold water cooled by the cold heat source 12 with the cold water stored in the lower part of the heat storage tank 11 to allow a large flow rate of heat medium to flow through the hydrogen storage alloy tank 10. There is. Therefore, the temperature of the return water from the hydrogen storage alloy tank 10 does not rise significantly. Therefore, the return water from the hydrogen storage alloy tank 10 is returned to the lower part of the heat storage tank 11. Further, the heat medium water sent to the cold heat source 12 has a low flow rate. Therefore, the difference between the temperature of the heat medium at the inlet of the cold heat source 12 and the temperature of the heat medium at the outlet of the cold source 12 can be increased, and the temperature of the heat medium can be efficiently set to an appropriate temperature. ..
なお、水素吸蔵時には、蓄熱槽１１が冷水で満蓄になることが考えられる。その場合には、冷熱源１２を停止させることで熱媒水の冷却を抑えることができ、蓄熱槽１１が冷水で満蓄になることを抑制できる。 At the time of hydrogen storage, it is conceivable that the heat storage tank 11 is fully stored with cold water. In that case, the cooling of the heat medium can be suppressed by stopping the cold heat source 12, and the heat storage tank 11 can be prevented from being fully stored with cold water.
次に、本発明の実施形態に係る水素利用システム１の水素放出時の熱系統の処理について説明する。 Next, the treatment of the heat system at the time of hydrogen release of the hydrogen utilization system 1 according to the embodiment of the present invention will be described.
水素放出時には、電磁弁２１〜３０は、制御装置１７により以下のように開閉制御され、加温制御が行われる。すなわち、電磁弁２１が「閉」状態、電磁弁２２が「開」状態に設定される。電磁弁２３が「閉」状態、電磁弁２４が「開」状態に設定される。電磁弁２５が「閉」状態、電磁弁２６が「開」状態に設定される。電磁弁２７が「閉」状態、電磁弁２８が「開」状態に設定される。電磁弁２９が「閉」状態、電磁弁３０が「開」状態に設定される。 At the time of hydrogen release, the solenoid valves 21 to 30 are controlled to open and close by the control device 17 as follows, and heating control is performed. That is, the solenoid valve 21 is set to the "closed" state, and the solenoid valve 22 is set to the "open" state. The solenoid valve 23 is set to the "closed" state, and the solenoid valve 24 is set to the "open" state. The solenoid valve 25 is set to the “closed” state, and the solenoid valve 26 is set to the “open” state. The solenoid valve 27 is set to the “closed” state, and the solenoid valve 28 is set to the “open” state. The solenoid valve 29 is set to the "closed" state, and the solenoid valve 30 is set to the "open" state.
図１において、水素放出時には、電磁弁２４が「開」状態となり、電磁弁２３が「閉」状態となるため、蓄熱槽１１の下部からの冷水が電磁弁２４を介してポンプ１６に送られる。このとき、電磁弁２６が「開」状態となり、電磁弁２５が「閉」状態となる。また、電磁弁２８が「開」状態となり、電磁弁２７が「閉」状態となる。このため、ポンプ１６から送り出された冷水は、燃料電池１３により加熱されて、三方弁１４に送られる。このとき、電磁弁３０が「開」状態となり、電磁弁２９が「閉」状態となる。このため、燃料電池１３により加熱された熱媒水は、蓄熱槽１１の上部の温水と混合され、ポンプ１５を介して、水素吸蔵合金タンク１０に送られる。水素吸蔵合金タンク１０内では、ポンプ１５から温水を送ることで、水素が放出される。この水素は、燃料電池１３で発電を行うのに用いることができる。また、このとき、電磁弁２２が「開」状態となり、電磁弁２１が「閉」状態となる。このため、水素吸蔵合金タンク１０からの戻りの温水は、蓄熱槽１１の上部に戻される。 In FIG. 1, when hydrogen is released, the solenoid valve 24 is in the “open” state and the solenoid valve 23 is in the “closed” state, so that cold water from the lower part of the heat storage tank 11 is sent to the pump 16 via the solenoid valve 24. .. At this time, the solenoid valve 26 is in the "open" state, and the solenoid valve 25 is in the "closed" state. Further, the solenoid valve 28 is in the "open" state, and the solenoid valve 27 is in the "closed" state. Therefore, the cold water sent out from the pump 16 is heated by the fuel cell 13 and sent to the three-way valve 14. At this time, the solenoid valve 30 is in the "open" state, and the solenoid valve 29 is in the "closed" state. Therefore, the heat medium heated by the fuel cell 13 is mixed with the hot water in the upper part of the heat storage tank 11 and sent to the hydrogen storage alloy tank 10 via the pump 15. In the hydrogen storage alloy tank 10, hydrogen is released by sending hot water from the pump 15. This hydrogen can be used to generate electricity in the fuel cell 13. At this time, the solenoid valve 22 is in the "open" state, and the solenoid valve 21 is in the "closed" state. Therefore, the hot water returned from the hydrogen storage alloy tank 10 is returned to the upper part of the heat storage tank 11.
図３は、本発明の実施形態に係る水素利用システムにおける水素放出時の熱系統の構成を示す図である。この図において、図１に示す経路から、電磁弁２１、２３、２５、２７、２９を閉じることにより流路が形成されない部分については、この実施形態における水素利用システムの理解を深めるために図示を省略している。 FIG. 3 is a diagram showing a configuration of a heat system at the time of hydrogen release in the hydrogen utilization system according to the embodiment of the present invention. In this figure, from the path shown in FIG. 1, the portion where the flow path is not formed by closing the solenoid valves 21, 23, 25, 27, 29 is illustrated in order to deepen the understanding of the hydrogen utilization system in this embodiment. It is omitted.
図３に示すように、水素放出時には、蓄熱槽１１の下部に蓄えられた冷水は、燃料電池１３により加熱され、三方弁１４で蓄熱槽１１の上部に蓄えられた温水と混合して増量されて、水素吸蔵合金タンク１０に送られる。水素吸蔵合金タンク１０内では、水素吸蔵合金が加温され、水素の放出が行われる。そして、水素吸蔵合金タンク１０からの戻り水は、蓄熱槽１１の上部に戻される。 As shown in FIG. 3, at the time of hydrogen release, the cold water stored in the lower part of the heat storage tank 11 is heated by the fuel cell 13 and mixed with the hot water stored in the upper part of the heat storage tank 11 by the three-way valve 14 to increase the amount. Is sent to the hydrogen storage alloy tank 10. In the hydrogen storage alloy tank 10, the hydrogen storage alloy is heated and hydrogen is released. Then, the return water from the hydrogen storage alloy tank 10 is returned to the upper part of the heat storage tank 11.
本実施形態では、三方弁１４により、燃料電池１３により加熱された温水と蓄熱槽１１の上部に蓄えられた温水と混合することで、水素吸蔵合金タンク１０に大流量の熱媒水を流している。したがって、水素吸蔵合金タンク１０から戻る熱媒水の温度は大きく下降しない。このため、水素吸蔵合金タンク１０からの戻り水を蓄熱槽１１の上部に戻している。また、燃料電池１３に送られる熱媒水は低流量である。このため、燃料電池１３の入口の熱媒水の温度と、燃料電池１３の出口の熱媒水の温度との差を大きくすることができ、熱媒水の温度を効率的に適温に設定できる。 In the present embodiment, the hot water heated by the fuel cell 13 and the hot water stored in the upper part of the heat storage tank 11 are mixed by the three-way valve 14 to allow a large flow rate of heat medium to flow through the hydrogen storage alloy tank 10. There is. Therefore, the temperature of the heat medium water returning from the hydrogen storage alloy tank 10 does not drop significantly. Therefore, the return water from the hydrogen storage alloy tank 10 is returned to the upper part of the heat storage tank 11. Further, the heat medium water sent to the fuel cell 13 has a low flow rate. Therefore, the difference between the temperature of the heat medium at the inlet of the fuel cell 13 and the temperature of the heat medium at the outlet of the fuel cell 13 can be increased, and the temperature of the heat medium can be efficiently set to an appropriate temperature. ..
なお、水素放出時に、蓄熱槽１１が温水で満蓄になることが考えられる。水素吸蔵時には、冷熱源１２を停止させることで、蓄熱槽１１が冷水で満蓄になることに対処できる。しかし、水素放出時には、放出された水素を燃料電池１３の発電に用いているので、燃料電池１３を停止して、蓄熱槽１１が温水で満蓄になることに対処することは難しい。 It is conceivable that the heat storage tank 11 will be fully stored with warm water when hydrogen is released. At the time of hydrogen storage, by stopping the cold heat source 12, it is possible to cope with the fact that the heat storage tank 11 is fully stored with cold water. However, at the time of hydrogen release, since the released hydrogen is used for power generation of the fuel cell 13, it is difficult to deal with the fact that the fuel cell 13 is stopped and the heat storage tank 11 is fully stored with hot water.
そこで、本実施形態では、水素放出時に蓄熱槽１１が温水で満蓄になる場合には、冷熱源１２を併用させることで、燃料電池１３に供給する熱媒水の温度を低下させている。すなわち、図４は、本発明の実施形態に係る水素利用システムにおいて水素放出時に蓄熱槽１１が温水で満蓄になる場合の熱系統の構成を示している。この図において、図１に示す経路において、水素放出時に蓄熱槽１１が温水で満蓄になる場合の熱系統として流路が形成されない部分については、この実施形態における水素利用システムの理解を深めるために図示を省略している。
水素放出時に蓄熱槽１１が温水で満蓄になる場合には、電磁弁２５を「開」状態とし、電磁弁２６を「閉」状態とする。これにより、図４に示すように、燃料電池１３には、冷熱源１２で冷却された熱媒水が送られることになり、蓄熱槽１１が温水で満蓄となることを防止できる。また、冷熱源１２で冷却された熱媒水を送ることで、燃料電池１３の冷却が行える。
Therefore, in the present embodiment, when the heat storage tank 11 is fully stored with hot water at the time of hydrogen release, the temperature of the heat medium water supplied to the fuel cell 13 is lowered by using the cold heat source 12 together. That is, FIG. 4 shows the configuration of the heat system when the heat storage tank 11 is fully stored with hot water at the time of hydrogen release in the hydrogen utilization system according to the embodiment of the present invention. In this figure, in the path shown in FIG. 1, the portion where the flow path is not formed as a heat system when the heat storage tank 11 is fully stored with hot water at the time of hydrogen release is to deepen the understanding of the hydrogen utilization system in this embodiment. The illustration is omitted.
When the heat storage tank 11 is fully stored with hot water at the time of hydrogen release, the solenoid valve 25 is set to the "open" state and the solenoid valve 26 is set to the "closed" state. As a result, as shown in FIG. 4, the heat medium water cooled by the cold heat source 12 is sent to the fuel cell 13, and it is possible to prevent the heat storage tank 11 from being fully stored with hot water. Further, the fuel cell 13 can be cooled by sending the heat medium water cooled by the cold heat source 12.
以上説明したように、本発明の実施形態に係る水素利用システム１では、冷熱源１２や燃料電池１３により冷却或いは加熱された熱媒水と、蓄熱槽１１に蓄積されている熱媒水とを混合して、水素吸蔵合金タンク１０に送っているので、水素吸蔵合金タンク１０に大量の熱媒水を供給することができる。また、本発明の実施形態に係る水素利用システム１では、冷熱源１２や燃料電池１３に送られる熱媒水を低流量とすることができ、冷熱源１２や燃料電池１３の入口と出口の熱媒水の温度差を大きくして、熱媒水の温度を効率的に適温に設定できる。流量の異なるこれらの系を混在させるために、蓄熱槽１１が設けられる。これにより、水素吸蔵合金の特性を考慮しつつ、効率的に熱利用をすることが可能となり、ＴｉＦｅ系水素吸蔵合金のような、幅広い温度帯で、厳しい温度管理が必要な水素吸蔵合金を扱う場合でも、効率的に熱利用が行え、適切な管理を行うことができる。また、本実施形態では、様々な温度差、流量を要する各装置を最低限の構成で実現可能であり、コストの低減を図ることができる。 As described above, in the hydrogen utilization system 1 according to the embodiment of the present invention, the heat medium water cooled or heated by the cold heat source 12 or the fuel cell 13 and the heat medium water stored in the heat storage tank 11 are combined. Since they are mixed and sent to the hydrogen storage alloy tank 10, a large amount of heat medium can be supplied to the hydrogen storage alloy tank 10. Further, in the hydrogen utilization system 1 according to the embodiment of the present invention, the heat medium water sent to the cold heat source 12 and the fuel cell 13 can have a low flow rate, and the heat at the inlet and outlet of the cold heat source 12 and the fuel cell 13 can be reduced. The temperature difference of the heat medium can be increased to efficiently set the temperature of the heat medium to an appropriate temperature. A heat storage tank 11 is provided in order to mix these systems having different flow rates. This makes it possible to efficiently utilize heat while considering the characteristics of hydrogen storage alloys, and handles hydrogen storage alloys that require strict temperature control in a wide temperature range, such as TiFe-based hydrogen storage alloys. Even in this case, heat can be used efficiently and appropriate management can be performed. Further, in the present embodiment, each device requiring various temperature differences and flow rates can be realized with the minimum configuration, and the cost can be reduced.
１０…水素吸蔵合金タンク、１１…蓄熱槽、１２…冷熱源、１３…燃料電池、１４…三方弁、１５，１６…ポンプ、１７…制御装置、２１〜３０…電磁弁 10 ... Hydrogen storage alloy tank, 11 ... Heat storage tank, 12 ... Cold heat source, 13 ... Fuel cell, 14 ... Three-way valve, 15, 16 ... Pump, 17 ... Control device, 21-30 ... Solenoid valve
Claims (4)
前記制御装置は、
水素を吸蔵する場合において、前記蓄熱槽の下部に蓄えられた冷水と、前記蓄熱槽の上部に蓄えられた温水を前記冷熱源によって冷却して生成された冷水とを混合して前記水素吸蔵合金タンクに供給して冷却し、前記水素吸蔵合金タンクからの戻りの冷水を前記蓄熱槽の下部に戻す制御を行う冷却制御部と、
水素を放出する場合において、前記蓄熱槽の上部に蓄えられた温水と、前記蓄熱槽の下部に蓄えられた冷水を前記燃料電池によって加熱して生成された温水とを混合して前記水素吸蔵合金タンクに供給して加温し、前記水素吸蔵合金タンクからの戻りの温水を前記蓄熱槽の上部に戻す制御を行う加温制御部と、
を有する水素利用システム。 A hydrogen utilization system having a hydrogen storage alloy tank in which a hydrogen storage alloy is sealed, a heat storage tank for storing heat medium, a cold heat source, a fuel cell, and a control device.
The control device is
In the case of storing hydrogen, the hydrogen storage alloy is obtained by mixing the cold water stored in the lower part of the heat storage tank and the cold water generated by cooling the hot water stored in the upper part of the heat storage tank with the cold heat source. A cooling control unit that supplies cold water to the tank to cool it and controls the return of cold water from the hydrogen storage alloy tank to the lower part of the heat storage tank.
When releasing hydrogen, the hydrogen storage alloy is obtained by mixing hot water stored in the upper part of the heat storage tank and hot water generated by heating cold water stored in the lower part of the heat storage tank by the fuel cell. A heating control unit that supplies hot water to the tank to heat it and controls the return hot water from the hydrogen storage alloy tank to the upper part of the heat storage tank.
Hydrogen utilization system with.
請求項１記載の水素利用システム。 In the case of releasing hydrogen, when the heat storage tank is filled with hot water, the heating control unit cools the hot water stored in the lower part of the heat storage tank with the cold heat source, and then the fuel cell. The hydrogen utilization system according to claim 1.
熱媒水を蓄える蓄熱槽を設け、
前記蓄熱槽の下部に蓄えられた冷水と、前記蓄熱槽の上部に蓄えられた温水を冷熱源によって冷却して生成された冷水とを混合して前記水素吸蔵合金タンクに供給し、前記水素吸蔵合金タンクからの戻りの冷水を前記蓄熱槽の下部に戻すことで、前記水素吸蔵合金タンクに封入された水素吸蔵合金に水素を吸蔵させる冷却工程と、
前記蓄熱槽の上部に蓄えられた温水と、前記蓄熱槽の下部に蓄えられた冷水を燃料電池によって加熱して生成された温水とを混合して前記水素吸蔵合金タンクに供給し、前記水素吸蔵合金タンクからの戻りの温水を前記蓄熱槽の上部に戻すことで、前記水素吸蔵合金タンクに封入された水素吸蔵合金から水素を放出させる加温工程と、
を含む水素利用方法。 This is a hydrogen utilization method in which a hydrogen storage alloy is sealed in a hydrogen storage alloy tank to store hydrogen.
A heat storage tank for storing heat medium is provided.
The cold water stored in the lower part of the heat storage tank and the cold water generated by cooling the hot water stored in the upper part of the heat storage tank with a cold heat source are mixed and supplied to the hydrogen storage alloy tank to supply the hydrogen storage alloy tank. A cooling step in which hydrogen is stored in the hydrogen storage alloy sealed in the hydrogen storage alloy tank by returning the cold water returned from the alloy tank to the lower part of the heat storage tank.
The hot water stored in the upper part of the heat storage tank and the hot water generated by heating the cold water stored in the lower part of the heat storage tank by a fuel cell are mixed and supplied to the hydrogen storage alloy tank to supply the hydrogen storage alloy tank. A heating step in which hydrogen is released from the hydrogen storage alloy sealed in the hydrogen storage alloy tank by returning the hot water returned from the alloy tank to the upper part of the heat storage tank.
Hydrogen utilization method including.
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