JP4568935B2 - Hydrogen gas production method - Google Patents

Hydrogen gas production method Download PDF

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Publication number
JP4568935B2
JP4568935B2 JP2000003558A JP2000003558A JP4568935B2 JP 4568935 B2 JP4568935 B2 JP 4568935B2 JP 2000003558 A JP2000003558 A JP 2000003558A JP 2000003558 A JP2000003558 A JP 2000003558A JP 4568935 B2 JP4568935 B2 JP 4568935B2
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hydrogen gas
stored
combustion
facility
storage
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JP2001192877A (en
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謙治 松田
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IHI Corp
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IHI Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、水素ガス製造方法に関するものである。
【０００２】
【従来の技術】
今日、省エネルギー、ＣＯ2削減、環境保全等の点から、廃熱の有効利用、燃焼制御、リサイクル、エネルギーカスケード等に関し、種々の技術が盛んに開発されている。
【０００３】
現在、超臨界圧ボイラ、コンバインドサイクル、コージェネレーション等種々の技術が実用化されてはいるものの、温暖化ガス（ＣＯ2等）の削減目標達成のためには今後、種々のエネルギーの転換を積極的に進めていく必要がある。
【０００４】
このため、太陽光、風等の自然エネルギーの活用、廃熱回収等の新エネルギーの実用化が広く研究されている。
【０００５】
【発明が解決しようとする課題】
しかし、上記したような太陽光、風等の自然エネルギーの活用、廃熱回収等の実用化を困難にしている主な障害は、エネルギー荷体の多様性、小規模熱源の分散、エネルギー密度、変換効率、安定性の低さ等のためにエネルギーの回収、利用が難しいこと、装置設備の経済性を発揮できないことによる高コスト性等である。
【０００６】
本発明は、このような点に鑑みてなしたもので、廃熱を利用して水素ガスを効率的に製造し、得られた水素ガスを貯蔵しておき、必要なときに任意に使用できるようにした水素ガス製造方法を提供することを目的としている。
【０００７】
【課題を解決するための手段】
本発明は、ごみ焼却場、火力発電所のような燃焼設備において、燃焼設備の廃熱を利用してカスケード構成された熱電発電素子により直流電力を生成し、得られた直流電力を用いて水を電気分解することにより水素ガスを製造し、製造した水素ガスを貯蔵手段に貯蔵する一方、水の電気分解による水素ガスの製造時に発生する酸素ガスを前記貯蔵手段とは別の貯蔵手段に貯蔵し、該貯蔵手段に貯蔵した酸素ガスを前記燃焼設備における燃焼時の酸素富化剤として供給することを特徴とする水素ガス製造方法、に係るものである。
【０００８】
上記手段において、水素ガスは液化貯蔵設備に液化して貯蔵してもよく、又、水素ガスは水素吸蔵合金が収容された吸蔵容器に吸蔵により貯蔵してもよい。
【０００９】
又水素ガスは燃焼設備に燃料として供給してもよい。
【００１１】
本発明によれば、以下のように作用する。
【００１２】
燃焼設備の廃熱を利用して熱電発電素子による発電を行い、それによって得られた直流電力を用いて水の電気分解を行い、これによって得た水素ガスを貯蔵手段にて貯蔵するようにしているので、貯蔵手段に貯蔵された水素ガスは、前記燃焼設備における燃焼用の燃料として用いたり、或いは前記燃焼設備とは全く異なる水素自動車の燃料、或いは燃料電池の燃料等、種々の燃料として広範囲に用いることができる。これにより、需要と供給の時間的、地理的隔たりがあってもそれを解消して、エネルギーの効率的な利用が可能になる。
又、水電気分解槽における水の電気分解によって製造される酸素ガスを貯蔵手段に貯蔵しておくことにより、この酸素ガスを燃焼設備の燃焼に酸素富化剤として供給して燃焼温度を上昇させることによりダイオキシンの発生を防止したり、或いは他の種々の目的に使用できる。
【００１３】
液化貯蔵設備及び吸蔵容器に貯蔵された水素ガスは、高い熱量を有しているので、この水素ガスを燃焼設備に供給して燃焼を行うと、燃焼設備の小型化、高効率化が図れ、更にＣＯ2の低減、ＮＯxの低減が図れる。
【００１５】
【発明の実施の形態】
以下、本発明の好適な実施の形態を図面に基づいて説明する。
【００１６】
廃熱等のエネルギーを有効に活用するためには、単純・直接的なエネルギー変換、或いは需要・供給の同時進行型のエネルギー変換ではなく、貯蔵・輸送が可能なエネルギーに変換し、これによって需要と供給の時間的、地理的な隔たりをなくすことができる方法を提供することである。
【００１７】
そのために、本発明では、廃熱を利用して熱電発電素子による発電と、これによって得られた直流電力を用いて水の電気分解を行う水電気分解槽とを組み合わせることによって、高い熱量、低いＮＯx発生等、二次エネルギーとして望ましい水素ガスを製造し、この水素ガスを貯蔵することにより、エネルギーの貯蔵、輸送を可能にしたものである。
【００１８】
図１は本発明における水素ガス製造方法を実施する装置の形態の一例を示すフローチャートである。図１では、ごみ焼却場１Ａ及び火力発電所１Ｂのような燃焼を行う燃焼設備１が図示されており、ごみ焼却場１Ａ及び火力発電所１Ｂに、燃焼時に大量に発生する廃熱を利用して発電を行う熱電発電素子２を設ける。
【００１９】
熱電発電素子２は、鉄シリサイド、ゲルマニウムシリサイド、カルコゲナイド、スクッテルダイトや傾斜機能材等の材料からなっており、熱エネルギーを直接電気エネルギーに変換して直流電力３を生成できるものである。熱電発電素子２は、多数をカスケード構成に備えることによって、大きな直流電力３が得られるようになっている。
【００２０】
図１中４は水電気分解槽であり、水電気分解槽４は、熱電発電素子２によって生成された直流電力３を用いて、水を電気分解して水素ガス５と酸素ガス６とを製造することができる。
【００２１】
水電気分解槽４で生成した水素ガス５は、貯蔵手段７にて貯蔵するようにしている。貯蔵手段７には、水素ガス５を低温液化させて貯蔵するようにした液化貯蔵設備８を用いることができる。
【００２２】
又、貯蔵手段７には、水素吸蔵合金が収容された吸蔵容器９を用いることができ、水素ガス５は吸蔵容器９の水素吸蔵合金に吸蔵させて貯蔵することができる。上記水素吸蔵合金には、ランタン・ニッケル系合金、鉄・チタン系合金等種々材料のものを用いることができる。
【００２３】
液化貯蔵設備８に液化貯蔵された水素ガス５、及び吸蔵容器９水素吸蔵合金に吸蔵により貯蔵された水素ガス５は、前記燃焼設備１における燃焼用の燃料として用いることができる他、水素自動車１０の燃料として用いたり、或いは燃料電池１１の燃料等、種々の燃料として広範囲に用いることができる。又、上記した液化貯蔵設備８から水素ガス５を気化して取り出す際に発生する冷熱１２は、冷却、冷凍等の装置の冷熱として利用することができる。
【００２４】
一方、前記した水電気分解槽４で水を電気分解することによって製造された酸素ガス６も、貯蔵手段１３に貯蔵することができる。酸素ガス６の貯蔵手段１３としては、液化貯蔵設備１４によって液化貯蔵したり、或いは酸素ボンベ１５に充填して貯蔵することができる。
【００２５】
前記液化貯蔵設備１４或いは酸素ボンベ１５に貯蔵された酸素ガス６は、前記燃焼設備１の燃焼時における酸素富化剤として用いたり、その他の種々の目的に使用することができる。又、上記した液化貯蔵設備１４から酸素ガス６を気化して取り出す際に発生する冷熱１６も、冷却、冷凍等の装置の冷熱として利用することができる。
【００２６】
以下に、上記形態例の作用を説明する。
【００２７】
図１において、ごみ焼却場１Ａ及び火力発電所１Ｂのような燃焼設備１で燃焼を行う場合、廃熱が発生する。このような廃熱は、燃焼設備１の燃焼用空気の予熱に用いることが実施されており、更にこの他にも、廃熱によって蒸気を生成させて暖房に利用したり、或いは給湯に利用すること等が実施されている。しかし、上記した廃熱の利用方法は、何れも熱エネルギーをそのまま利用する方法であり単純・直接的なエネルギー変換であり、需要・供給の同時進行型のエネルギー変換である。
【００２８】
これに対し、本発明では、燃焼設備１に、廃熱によって発電を行うようにした熱電発電素子２を備えているので、廃熱を利用して効率的な発電を行うことができる。熱電発電素子２は、熱エネルギーを直接電気エネルギーに変換して直流電力３を生成することができ、多数の熱電発電素子２をカスケード構成とすることによって大きな直流電力３を得ることができる。
【００２９】
このような熱電発電素子２は、前記したごみ焼却場１Ａ及び火力発電所１Ｂによる燃焼設備１以外にも廃熱の発生を伴う種々の設備に設置することによって、大きな直流電力を得ることができる。
【００３０】
熱電発電素子２によって生成された直流電力３は、水電気分解槽４に供給される。水電気分解槽４では、供給された直流電力３によって、水を電気分解し、水素ガス５と酸素ガス６とを製造する。このとき、熱電発電素子２で得られる電力が直流であり、又水電気分解槽４で用いられる電力も直流であるので、熱電発電素子２で得られた直流電力３をそのまま水電気分解槽４に供給して用いることができるので、電力の直／交変換を要せず、エネルギーを効率良く利用することができる。
【００３１】
水電気分解槽４で製造された水素ガス５は、貯蔵手段７における液化貯蔵設備８に液化貯蔵する、或いは吸蔵容器９に収容された水素吸蔵合金に吸蔵させて貯蔵する方法によって貯蔵する。このとき、水素ガス５を水素吸蔵合金に吸蔵させて貯蔵する方法は、水素ガス５を単に水素ガスボンベに充填する方法に比して、１／３〜１／５の容積で済むという利点がある。
【００３２】
上記したように、燃焼設備１の廃熱を利用して熱電発電素子２により発電を行い、得られた直流電力３を用いて水電気分解槽４により水の電気分解を行い、水の電気分解にて得られた水素ガス５を貯蔵手段７にて貯蔵するようにしているので、貯蔵手段７に貯蔵された水素ガス５は、必要に応じて、前記燃焼設備１の燃焼用の燃料として用いたり、或いは燃焼設備１とは全く異なる水素自動車１０の燃料として用いたり、更には燃料電池１１の燃料等、種々の燃料として広範囲に用いることができる。これにより、需要と供給の時間的、地理的隔たりがあっても、これを解消してエネルギーの効率的な利用を可能にすることができる。
【００３３】
又、上記した液化貯蔵設備８から水素ガス５を気化して取り出す際に発生する冷熱１２は、冷却、冷凍等の装置の冷熱として有効に利用することができる。
【００３４】
前記において、液化貯蔵設備８及び吸蔵容器９に貯蔵された水素ガス５は、高い熱量を有しているので、この水素ガス５を燃焼設備１に燃料として供給し燃焼を行うと、燃焼設備１の小型化、高効率化が図れ、更にＣＯ2の低減、ＮＯxの低減を図ることができる。
【００３５】
一方、前記した水電気分解槽４で水を電気分解することによって製造された酸素ガス６も、液化貯蔵設備１４或いは酸素ボンベ１５からなる貯蔵手段１３に貯蔵することができる。液化貯蔵設備１４或いは酸素ボンベ１５に貯蔵された酸素ガス６は、燃焼設備１の燃焼時の酸素富化剤として供給する等、種々の目的に使用することができる。
【００３６】
貯蔵手段１３に貯蔵された酸素ガス６を燃焼設備１の酸素富化剤として利用すると、燃焼設備１の燃焼温度を上昇させて、ダイオキシンの発生を低減できる効果がある。又、前記液化貯蔵設備１４から酸素ガス６を気化して取り出す際に発生する冷熱１６も、冷却、冷凍等の装置の冷熱として利用することができる。
【００３７】
尚、本発明は上記形態例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加えることができる。
【００３８】
【発明の効果】
本発明によれば、燃焼設備の廃熱を利用して熱電発電素子による発電を行い、それによって得られた直流電力を用いて水の電気分解を行い、これによって得た水素ガスを貯蔵手段にて貯蔵するようにしているので、貯蔵手段に貯蔵された水素ガスは、前記燃焼設備における燃焼用の燃料として用いたり、或いは前記燃焼装置とは全く異なる水素自動車の燃料、或いは燃料電池の燃料等、種々の燃料として広範囲に用いることができる。これにより、需要と供給の時間的、地理的隔たりがあってもそれを解消して、エネルギーの効率的な利用が可能になるという優れた効果を奏する。
【００３９】
液化貯蔵設備及び吸蔵容器に貯蔵された水素ガスは、高い熱量を有しているので、この水素ガスを燃焼装置に供給して燃焼を行うと、燃焼装置の小型化、高効率化が図れ、更にＣＯ2の低減、ＮＯxの低減が図れる効果がある。
【００４０】
又、水電気分解槽における水の電気分解によって製造される酸素ガスを貯蔵手段に貯蔵しておくことにより、燃焼設備の燃焼に酸素富化剤として供給して燃焼温度を上昇させることによりダイオキシンの発生を防止したり、或いは他の種々の目的に使用できる効果がある。
【図面の簡単な説明】
【図１】本発明の水素ガス製造方法を実施する装置の形態の一例を示すフローチャートである。
【符号の説明】
１ 燃焼設備
１Ａ ごみ焼却場
１Ｂ 火力発電所
２ 熱電発電素子
３ 直流電力
４ 水電気分解槽
５ 水素ガス
６ 酸素ガス
７ 貯蔵手段
８ 液化貯蔵設備
９ 吸蔵容器
１３ 貯蔵手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing hydrogen gas.
[0002]
[Prior art]
Today, various technologies have been actively developed with respect to effective use of waste heat, combustion control, recycling, energy cascade, and the like from the viewpoints of energy saving, CO 2 reduction, environmental protection, and the like.
[0003]
Although various technologies such as supercritical pressure boilers, combined cycle, and cogeneration are currently being put into practical use, in order to achieve greenhouse gas (CO 2 etc.) reduction targets, various energy conversions will be actively promoted in the future. It is necessary to move forward.
[0004]
For this reason, utilization of natural energy such as sunlight and wind, and practical application of new energy such as waste heat recovery are widely studied.
[0005]
[Problems to be solved by the invention]
However, the main obstacles that make it difficult to put into practical use such as the utilization of natural energy such as sunlight and wind as described above and waste heat recovery are the diversity of energy packages, dispersion of small-scale heat sources, energy density, It is difficult to recover and use energy due to low conversion efficiency, low stability, etc., and high cost due to inefficiency of equipment and equipment.
[0006]
The present invention has been made in view of such points, and efficiently produces hydrogen gas using waste heat, stores the obtained hydrogen gas, and can be used arbitrarily when necessary. An object of the present invention is to provide a hydrogen gas production method.
[0007]
[Means for Solving the Problems]
The present invention relates to a combustion facility such as a waste incineration plant or a thermal power plant, in which direct current power is generated by thermoelectric power generation elements configured in cascade using waste heat of the combustion facility, and water is obtained using the obtained direct current power. Hydrogen gas is produced by electrolyzing, and the produced hydrogen gas is stored in the storage means, while oxygen gas generated during the production of hydrogen gas by water electrolysis is stored in a storage means different from the storage means. The oxygen gas stored in the storage means is supplied as an oxygen enrichment agent during combustion in the combustion facility .
[0008]
In the above means, the hydrogen gas may be liquefied and stored in a liquefied storage facility, or the hydrogen gas may be stored by occlusion in an occlusion container containing a hydrogen occlusion alloy.
[0009]
Hydrogen gas may be supplied as fuel to the combustion facility.
[0011]
The present invention operates as follows.
[0012]
Using the waste heat of the combustion equipment, power is generated by the thermoelectric power generation element, the water is electrolyzed using the DC power obtained thereby, and the resulting hydrogen gas is stored in the storage means. Therefore, the hydrogen gas stored in the storage means is used as a fuel for combustion in the combustion facility, or as a wide variety of fuels such as a fuel for a hydrogen vehicle completely different from the combustion facility or a fuel for a fuel cell. Can be used. As a result, even if there is a time and geographical gap between supply and demand, it can be resolved and energy can be used efficiently.
Also, by storing oxygen gas produced by electrolysis of water in the water electrolysis tank in the storage means, this oxygen gas is supplied to the combustion of the combustion facility as an oxygen enricher to raise the combustion temperature. Therefore, generation of dioxins can be prevented or used for various other purposes.
[0013]
Since the hydrogen gas stored in the liquefied storage facility and the storage container has a high calorific value, if this hydrogen gas is supplied to the combustion facility and burned, the combustion facility can be made smaller and more efficient, Further, CO 2 and NOx can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0016]
In order to make effective use of energy such as waste heat, instead of simple and direct energy conversion, or simultaneous energy conversion of supply and demand, it is converted into energy that can be stored and transported, and this is It is to provide a method that can eliminate the time and geographical gap between supply and supply.
[0017]
Therefore, in the present invention, a combination of a power generation by a thermoelectric power generation element using waste heat and a water electrolysis tank that performs electrolysis of water using DC power obtained thereby, a high calorific value and low By producing hydrogen gas desirable as secondary energy, such as NOx generation, and storing this hydrogen gas, energy can be stored and transported.
[0018]
FIG. 1 is a flowchart showing an example of an apparatus for carrying out the hydrogen gas production method of the present invention. FIG. 1 shows a combustion facility 1 that performs combustion such as a waste incineration plant 1A and a thermal power plant 1B. The waste incineration plant 1A and thermal power plant 1B utilize waste heat generated in large quantities during combustion. A thermoelectric power generation element 2 for generating power is provided.
[0019]
The thermoelectric power generation element 2 is made of a material such as iron silicide, germanium silicide, chalcogenide, skutterudite, or a functionally gradient material, and can generate direct-current power 3 by directly converting thermal energy into electrical energy. A large number of thermoelectric power generation elements 2 are provided in a cascade configuration so that large DC power 3 can be obtained.
[0020]
In FIG. 1, reference numeral 4 denotes a water electrolysis tank, and the water electrolysis tank 4 produces hydrogen gas 5 and oxygen gas 6 by electrolyzing water using the DC power 3 generated by the thermoelectric power generation element 2. can do.
[0021]
The hydrogen gas 5 generated in the water electrolysis tank 4 is stored in the storage means 7. The storage means 7 can be a liquefied storage facility 8 in which the hydrogen gas 5 is liquefied and stored at a low temperature.
[0022]
The storage means 7 can be a storage container 9 in which a hydrogen storage alloy is accommodated, and the hydrogen gas 5 can be stored by being stored in the hydrogen storage alloy of the storage container 9. As the hydrogen storage alloy, various materials such as lanthanum / nickel alloy and iron / titanium alloy can be used.
[0023]
The hydrogen gas 5 liquefied and stored in the liquefied storage facility 8 and the hydrogen gas 5 stored in the storage container 9 by storage in the hydrogen storage alloy can be used as a fuel for combustion in the combustion facility 1, as well as the hydrogen automobile 10. It can be used as a fuel for various types of fuel such as a fuel for the fuel cell 11 or the like. In addition, the cold heat 12 generated when the hydrogen gas 5 is vaporized and taken out from the liquefied storage facility 8 can be used as cold heat for an apparatus such as cooling and freezing.
[0024]
On the other hand, the oxygen gas 6 produced by electrolyzing water in the water electrolysis tank 4 can also be stored in the storage means 13. As the storage means 13 for the oxygen gas 6, it can be liquefied and stored by the liquefied storage equipment 14, or can be filled and stored in the oxygen cylinder 15.
[0025]
The oxygen gas 6 stored in the liquefied storage facility 14 or the oxygen cylinder 15 can be used as an oxygen enricher during combustion of the combustion facility 1 or for various other purposes. Further, the cold heat 16 generated when the oxygen gas 6 is vaporized and taken out from the liquefied storage facility 14 can also be used as cold heat for an apparatus such as cooling and freezing.
[0026]
The operation of the above embodiment will be described below.
[0027]
In FIG. 1, when combustion is performed in a combustion facility 1 such as a waste incineration plant 1A and a thermal power plant 1B, waste heat is generated. Such waste heat is used for preheating the combustion air of the combustion facility 1, and in addition to this, steam is generated by waste heat and used for heating, or used for hot water supply. That is being implemented. However, any of the above-described methods of using waste heat is a method of using heat energy as it is, simple and direct energy conversion, and simultaneous supply and demand energy conversion.
[0028]
On the other hand, in the present invention, the combustion facility 1 includes the thermoelectric power generation element 2 that generates power by waste heat, so that efficient power generation can be performed using waste heat. The thermoelectric power generation element 2 can generate direct-current power 3 by directly converting thermal energy into electrical energy, and can obtain a large direct-current power 3 by forming a large number of thermoelectric power generation elements 2 in a cascade configuration.
[0029]
Such a thermoelectric power generation element 2 can obtain large direct current power by being installed in various facilities accompanied by the generation of waste heat in addition to the combustion facility 1 by the waste incineration plant 1A and the thermal power plant 1B. .
[0030]
The DC power 3 generated by the thermoelectric generator 2 is supplied to the water electrolysis tank 4. In the water electrolysis tank 4, water is electrolyzed with the supplied DC power 3 to produce hydrogen gas 5 and oxygen gas 6. At this time, since the electric power obtained by the thermoelectric power generation element 2 is DC, and the electric power used by the water electrolysis tank 4 is also direct current, the DC power 3 obtained by the thermoelectric power generation element 2 is used as it is. Therefore, it is possible to efficiently use energy without requiring direct / interchange conversion of electric power.
[0031]
The hydrogen gas 5 produced in the water electrolysis tank 4 is stored by liquefying and storing in the liquefied storage facility 8 in the storage means 7 or by storing it in the hydrogen storage alloy stored in the storage container 9. At this time, the method in which the hydrogen gas 5 is stored in the hydrogen storage alloy has an advantage that the volume of 1/3 to 1/5 is sufficient as compared with the method in which the hydrogen gas 5 is simply filled in the hydrogen gas cylinder. .
[0032]
As described above, the waste heat of the combustion facility 1 is used to generate power with the thermoelectric generator 2, and the obtained direct current power 3 is used to electrolyze water with the water electrolysis tank 4, thereby electrolyzing water. Since the hydrogen gas 5 obtained in step 1 is stored in the storage means 7, the hydrogen gas 5 stored in the storage means 7 is used as a fuel for combustion in the combustion facility 1 as necessary. It can be used as a fuel for a hydrogen vehicle 10 that is completely different from the combustion facility 1, and can be used in a wide range as a fuel for the fuel cell 11. As a result, even if there is a temporal and geographical gap between supply and demand, it is possible to eliminate this and enable efficient use of energy.
[0033]
Further, the cold heat 12 generated when the hydrogen gas 5 is vaporized and taken out from the liquefied storage facility 8 can be effectively used as cold heat for a device such as cooling or freezing.
[0034]
In the above, since the hydrogen gas 5 stored in the liquefied storage facility 8 and the storage container 9 has a high calorific value, when the hydrogen gas 5 is supplied to the combustion facility 1 as fuel and burned, the combustion facility 1 Can be reduced in size and efficiency, and CO 2 and NO x can be reduced.
[0035]
On the other hand, the oxygen gas 6 produced by electrolyzing water in the water electrolysis tank 4 can also be stored in the storage means 13 including the liquefied storage facility 14 or the oxygen cylinder 15. The oxygen gas 6 stored in the liquefied storage facility 14 or the oxygen cylinder 15 can be used for various purposes, such as being supplied as an oxygen enricher during combustion in the combustion facility 1.
[0036]
When the oxygen gas 6 stored in the storage means 13 is used as an oxygen enriching agent for the combustion facility 1, there is an effect that the combustion temperature of the combustion facility 1 is raised and the generation of dioxins can be reduced. Further, the cold heat 16 generated when the oxygen gas 6 is vaporized and taken out from the liquefied storage facility 14 can also be used as cold heat for devices such as cooling and freezing.
[0037]
In addition, this invention is not limited only to the said form example, A various change can be added in the range which does not deviate from the summary of this invention.
[0038]
【The invention's effect】
According to the present invention, the waste heat of the combustion facility is used to generate power by the thermoelectric power generation element, the direct current power obtained thereby is electrolyzed, and the hydrogen gas obtained thereby is stored in the storage means. The hydrogen gas stored in the storage means is used as a fuel for combustion in the combustion facility, or is a fuel for a hydrogen vehicle that is completely different from the combustion device, or a fuel for a fuel cell, etc. It can be used widely as various fuels. As a result, even if there is a time and geographical gap between supply and demand, the effect is solved, and energy can be efficiently used.
[0039]
Since the hydrogen gas stored in the liquefied storage facility and the storage container has a high calorific value, if this hydrogen gas is supplied to the combustion device and burned, the combustion device can be made smaller and more efficient, In addition, CO 2 and NOx can be reduced.
[0040]
In addition, by storing oxygen gas produced by electrolysis of water in a water electrolysis tank in a storage means, it is supplied as an oxygen-enriching agent to the combustion of combustion equipment, and the combustion temperature is increased to increase the combustion temperature. There is an effect that the generation can be prevented or used for various other purposes.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an example of an apparatus for carrying out a hydrogen gas production method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Combustion equipment 1A Waste incineration plant 1B Thermal power plant 2 Thermoelectric power generation element 3 DC power 4 Water electrolysis tank 5 Hydrogen gas 6 Oxygen gas 7 Storage means 8 Liquefaction storage equipment 9 Occlusion container 13 Storage means

Claims (4)

ごみ焼却場、火力発電所のような燃焼設備において、燃焼設備の廃熱を利用してカスケード構成された熱電発電素子により直流電力を生成し、得られた直流電力を用いて水を電気分解することにより水素ガスを製造し、製造した水素ガスを貯蔵手段に貯蔵する一方、水の電気分解による水素ガスの製造時に発生する酸素ガスを前記貯蔵手段とは別の貯蔵手段に貯蔵し、該貯蔵手段に貯蔵した酸素ガスを前記燃焼設備における燃焼時の酸素富化剤として供給することを特徴とする水素ガス製造方法。In a combustion facility such as a garbage incineration plant or thermal power plant, DC power is generated by thermoelectric power generation elements configured in cascade using waste heat from the combustion facility, and water is electrolyzed using the obtained DC power. The hydrogen gas is produced and the produced hydrogen gas is stored in the storage means, while the oxygen gas generated during the production of hydrogen gas by electrolysis of water is stored in a storage means different from the storage means, and the storage A method for producing hydrogen gas, characterized in that oxygen gas stored in the means is supplied as an oxygen enriching agent during combustion in the combustion facility . 水素ガスを液化貯蔵設備に液化して貯蔵することを特徴とする請求項１記載の水素ガス製造方法。  2. The method for producing hydrogen gas according to claim 1, wherein the hydrogen gas is liquefied and stored in a liquefied storage facility. 水素ガスを水素吸蔵合金が収容された吸蔵容器に吸蔵により貯蔵することを特徴とする請求項１記載の水素ガス製造方法。  2. The method for producing hydrogen gas according to claim 1, wherein the hydrogen gas is stored by occlusion in an occlusion container containing a hydrogen occlusion alloy. 水素ガスを燃焼設備に燃料として供給することを特徴とする請求項１又は２又は３記載の水素ガス製造方法。  4. The method for producing hydrogen gas according to claim 1, wherein hydrogen gas is supplied as fuel to a combustion facility.
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