JP2006282460A - Apparatus for producing hydrogen - Google Patents

Apparatus for producing hydrogen Download PDF

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JP2006282460A
JP2006282460A JP2005105090A JP2005105090A JP2006282460A JP 2006282460 A JP2006282460 A JP 2006282460A JP 2005105090 A JP2005105090 A JP 2005105090A JP 2005105090 A JP2005105090 A JP 2005105090A JP 2006282460 A JP2006282460 A JP 2006282460A
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gas
hydrogen
offgas
valve
hydrogen purification
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JP4850431B2 (en
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Toyokazu Tanaka
豊和 田中
Yukio Hiranaka
幸男 平中
Takaaki Asakura
隆晃 朝倉
Michitsugu Mori
理嗣 森
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Osaka Gas Co Ltd
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Osaka Gas Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing hydrogen capable of supplying an off-gas to equipment for using an off-gas at a stable pressure regardless of a process executed in a hydrogen purification column by making only a small improvement to a conventional apparatus. <P>SOLUTION: The apparatus for producing hydrogen comprises hydrogen purification columns 1-3, an off-gas tank 13 for storing an off-gas, and equipment for using an off-gas 15, wherein an off-gas exhaust valve 14 is provided in off-gas exhaust paths 11, 11a-11c for connecting the hydrogen purification columns 1-3 to the off-gas tank 13; a pressure reducing valve 17a is provided in an off-gas supply path 16 for connecting the off-gas tank 13 to the equipment for using an off-gas 15; and an off-gas bypass valve 19 is provided in an off-gas bypass path 18 which bypasses the pressure reducing valve 17a and connects the off-gas exhaust path 11 to the off-gas supply path 16. In addition, a second pressure valve 17b is provided in the off-gas supply path 16 downstream of the connection point of the off-gas bypass path 18 and the off-gas supply path 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、吸着剤を収容する水素精製塔と、その水素精製塔からのオフガスを貯蔵するオフガスタンクとオフガスを使用するオフガス使用機器を備え、前記水素精製塔とオフガスタンクを接続するオフガス排出路にオフガス排出弁が設けられ、前記オフガスタンクとオフガス使用機器を接続するオフガス供給路に減圧弁が設けられて、前記オフガス排出弁、オフガスタンク、および、減圧弁をバイパスして前記オフガス排出路とオフガス供給路を接続するオフガスバイパス路にオフガスバイパス弁が設けられている水素製造装置に関する。   The present invention includes a hydrogen purification tower that contains an adsorbent, an offgas tank that stores offgas from the hydrogen purification tower, and an offgas using device that uses offgas, and an offgas discharge path that connects the hydrogen purification tower and the offgas tank. An off-gas discharge valve is provided, a pressure-reduction valve is provided in an off-gas supply path connecting the off-gas tank and the off-gas using device, and the off-gas discharge valve, the off-gas tank, and the pressure-reduction valve are bypassed. The present invention relates to a hydrogen production apparatus in which an offgas bypass valve is provided in an offgas bypass path connecting the offgas supply path.

このような水素製造装置は、例えば、１３Ａなどの都市ガスを原料として改質、変成された水素リッチガスを使用し、吸着剤を収容する水素精製塔において、吸着、減圧、洗浄などの工程を繰り返しながら高純度水素ガスを連続的に製造し、減圧工程や洗浄工程時に発生するオフガスをオフガスタンクに一時的に貯蔵しておいて、例えば、バーナの燃料として利用するものである。
従来、このような水素製造装置では、オフガス排出弁、オフガスタンク、および、減圧弁をバイパスしてオフガス排出路とオフガス供給路を接続するオフガスバイパス路において、その上流側にオフガスバイパス弁を設け、下流側に第２の減圧弁を設けたものが知られている（例えば、特許文献１参照）。 Such a hydrogen production apparatus, for example, repeats steps such as adsorption, decompression, and washing in a hydrogen refining tower that contains an adsorbent using a hydrogen rich gas that has been reformed and transformed from city gas such as 13A. However, high-purity hydrogen gas is continuously produced, and off-gas generated during the depressurization process or the cleaning process is temporarily stored in an off-gas tank and used as, for example, a burner fuel.
Conventionally, in such a hydrogen production apparatus, an offgas bypass valve is provided on the upstream side of an offgas discharge valve, an offgas tank, and an offgas bypass passage that bypasses the pressure reducing valve and connects the offgas discharge passage and the offgas supply passage, The thing which provided the 2nd pressure-reduction valve in the downstream is known (for example, refer patent document 1).

特開２００４−２９９９９４号公報（図１、図２、図４）Japanese Unexamined Patent Publication No. 2004-299994 (FIGS. 1, 2, and 4)

上記公報に記載の従来技術によれば、例えば、水素精製塔が吸着工程を実行している際には、オフガスタンク内のオフガスが、オフガス供給路に設けられた減圧弁を通ってバーナに供給され、水素精製塔が洗浄工程を実行している際には、その水素精製塔からのオフガスが、オフガスバイパス路に設けられた第２の減圧弁を通ってバーナに供給されることになる。
したがって、バーナに供給されるオフガスは、水素精製塔の吸着工程時と洗浄工程時にそれぞれ別の減圧弁を通ることになってオフガスに圧力変動が発生し、そのため、バーナの燃焼が不安定になるという問題があった。 According to the prior art described in the above publication, for example, when the hydrogen purification tower is performing an adsorption process, off-gas in the off-gas tank is supplied to the burner through a pressure reducing valve provided in the off-gas supply path. When the hydrogen purification tower is performing the washing step, the offgas from the hydrogen purification tower is supplied to the burner through the second pressure reducing valve provided in the offgas bypass passage.
Therefore, the off-gas supplied to the burner passes through different pressure reducing valves during the adsorption process and the cleaning process of the hydrogen purification tower, causing pressure fluctuations in the off-gas, and the combustion of the burner becomes unstable. There was a problem.

本発明は、このような従来の問題点に着目したもので、その目的は、従来の装置に少し改良を加えるだけで、水素精製塔における実行工程の如何にかかわらず、バーナなどのオフガス使用機器に対して常に安定した圧力でオフガスを供給することのできる水素製造装置を提供することにある。   The present invention pays attention to such a conventional problem, and its purpose is to add a little improvement to the conventional apparatus and to use an off-gas equipment such as a burner regardless of the execution process in the hydrogen purification tower. An object of the present invention is to provide a hydrogen production apparatus that can supply off-gas at a stable pressure at all times.

本発明の第１の特徴構成は、吸着剤を収容する水素精製塔と、その水素精製塔からのオフガスを貯蔵するオフガスタンクとオフガスを使用するオフガス使用機器を備え、前記水素精製塔とオフガスタンクを接続するオフガス排出路にオフガス排出弁が設けられ、前記オフガスタンクとオフガス使用機器を接続するオフガス供給路に減圧弁が設けられて、前記オフガス排出弁、オフガスタンク、および、減圧弁をバイパスして前記オフガス排出路とオフガス供給路を接続するオフガスバイパス路にオフガスバイパス弁が設けられている水素製造装置であって、前記オフガスバイパス路とオフガス供給路との接続箇所より下流側のオフガス供給路に第２の減圧弁が設けられているところにある。   A first characteristic configuration of the present invention includes a hydrogen purification tower that stores an adsorbent, an offgas tank that stores offgas from the hydrogen purification tower, and an offgas using device that uses offgas, the hydrogen purification tower and the offgas tank. An off-gas discharge valve is provided in the off-gas discharge path connecting the off-gas, and a pressure-reducing valve is provided in the off-gas supply path connecting the off-gas tank and the off-gas using device, bypassing the off-gas discharge valve, the off-gas tank, and the pressure reducing valve. An off-gas bypass valve is provided in an off-gas bypass path connecting the off-gas discharge path and the off-gas supply path, and the off-gas supply path downstream from the connection point between the off-gas bypass path and the off-gas supply path Are provided with a second pressure reducing valve.

本発明の第１の特徴構成によれば、水素精製塔とオフガスタンクを接続するオフガス排出路にオフガス排出弁が設けられ、オフガスタンクとオフガス使用機器を接続するオフガス供給路に減圧弁が設けられ、オフガス排出弁、オフガスタンク、および、減圧弁をバイパスしてオフガス排出路とオフガス供給路を接続するオフガスバイパス路にオフガスバイパス弁が設けられている水素製造装置で、オフガスバイパス路とオフガス供給路との接続箇所より下流側のオフガス供給路に第２の減圧弁が設けられているので、例えば、水素精製塔が吸着工程を実行している際には、オフガスタンク内のオフガスは、オフガス供給路に設けられた減圧弁を通り、さらに、第２の減圧弁を通ってオフガス使用機器に供給される。そして、水素精製塔が洗浄工程を実行している際には、その水素精製塔からのオフガスも、オフガスバイパス路を通った後、同じ第２の減圧弁を通ってオフガス使用機器に供給される。
すなわち、オフガス使用機器に供給されるオフガスは、水素精製塔における実行工程の如何にかかわらず、常に同じ第２の減圧弁を通ってオフガス使用機器に供給されるので、オフガス使用機器に対して常に安定した圧力でオフガスを供給することが可能となる。 According to the first characteristic configuration of the present invention, an offgas discharge valve is provided in the offgas discharge path connecting the hydrogen purification tower and the offgas tank, and a pressure reducing valve is provided in the offgas supply path connecting the offgas tank and the offgas using device. An off-gas bypass passage and an off-gas supply passage in which the off-gas bypass valve is provided in the off-gas bypass passage connecting the off-gas discharge passage and the off-gas supply passage by bypassing the off-gas discharge valve, the off-gas tank, and the pressure reducing valve Since the second pressure reducing valve is provided in the off gas supply path downstream from the connection point, for example, when the hydrogen purification tower is performing the adsorption process, the off gas in the off gas tank is supplied as the off gas supply. It passes through the pressure reducing valve provided in the passage, and further passes through the second pressure reducing valve to be supplied to the off-gas using equipment. When the hydrogen purification tower is performing the washing step, the offgas from the hydrogen purification tower also passes through the offgas bypass passage and is then supplied to the offgas-using equipment through the same second pressure reducing valve. .
That is, the offgas supplied to the offgas using equipment is always supplied to the offgas using equipment through the same second pressure reducing valve regardless of the execution step in the hydrogen purification tower. It is possible to supply off-gas at a stable pressure.

本発明の第２の特徴構成は、前記水素精製塔を複数備え、それら複数の水素精製塔が前記オフガス排出路に並列に接続されているところにある。   The second characteristic configuration of the present invention resides in that a plurality of the hydrogen purification towers are provided, and the plurality of hydrogen purification towers are connected in parallel to the off-gas discharge passage.

本発明の第２の特徴構成によれば、水素精製塔を複数備え、それら複数の水素精製塔がオフガス排出路に並列に接続されているので、複数の水素精製塔において吸着工程、減圧工程、洗浄工程などを繰り返して実行することにより、高純度水素を連続的に製造することも、また、オフガス使用機器に対して安定した圧力のオフガスを連続的に供給することも可能となる。   According to the second characteristic configuration of the present invention, a plurality of hydrogen purification towers are provided, and the plurality of hydrogen purification towers are connected in parallel to the off-gas discharge path. By repeatedly performing the cleaning process and the like, it is possible to continuously produce high-purity hydrogen and continuously supply off-gas having a stable pressure to the off-gas using equipment.

本発明の第３の特徴構成は、前記オフガス使用機器が、オフガスを燃料とするバーナであるところにある。   A third characteristic configuration of the present invention is that the off-gas using device is a burner using off-gas as fuel.

本発明の第３の特徴構成によれば、オフガス使用機器が、オフガスを燃料とするバーナであるから、水素製造時に発生するオフガスを燃料として利用することができ、その燃料としてのオフガスをバーナに対して安定した圧力で供給し、バーナにおいて安定した燃焼を行うことができる。   According to the third characteristic configuration of the present invention, since the off-gas using device is a burner using off-gas as fuel, off-gas generated during hydrogen production can be used as fuel, and the off-gas as fuel is used as the burner. On the other hand, it can supply with the stable pressure and can perform the stable combustion in a burner.

本発明による水素製造装置の実施の形態を図面に基づいて説明する。
この水素製造装置は、水素リッチガスから高純度水素を製造するもので、図１に示すように、第１から第３までの３つの水素精製塔１，２，３を備え、各水素精製塔１，２，３は、水素リッチガス供給路４に対してそれぞれ供給用分岐路４ａ，４ｂ，４ｃを介して互いに並列に接続されている。各供給用分岐路４ａ，４ｂ，４ｃには、それぞれ供給用電磁弁５ａ，５ｂ，５ｃが設けられ、水素リッチガス供給路４には、水素リッチガスが供給される。 Embodiments of a hydrogen production apparatus according to the present invention will be described with reference to the drawings.
This hydrogen production apparatus produces high-purity hydrogen from a hydrogen-rich gas. As shown in FIG. 1, the hydrogen production apparatus includes three hydrogen purification columns 1, 2, 3 from first to third, and each hydrogen purification column 1 , 2 and 3 are connected to the hydrogen rich gas supply path 4 in parallel via supply branch paths 4a, 4b and 4c, respectively. The supply branch passages 4a, 4b, and 4c are provided with supply solenoid valves 5a, 5b, and 5c, respectively, and the hydrogen rich gas supply passage 4 is supplied with hydrogen rich gas.

水素リッチガス供給路４に供給される水素リッチガスは、例えば、１３Ａなどの都市ガスを原料とし、昇圧した都市ガスから硫黄分をｐｐｂレベルにまで除去し、水蒸気改質用の触媒によって水素リッチガスに改質するとともに、変成用の触媒によって水素リッチガス中の一酸化炭素を二酸化炭素に変成し、さらに、余分な水分を除去した後の水素リッチガスである。
そして、各水素精製塔１，２，３には、加圧下においてその水素リッチガスから水、二酸化炭素、一酸化炭素、メタン、窒素などの不純物を吸着除去して高純度水素を精製する適切な吸着剤が収容されている。 The hydrogen-rich gas supplied to the hydrogen-rich gas supply path 4 uses, for example, city gas such as 13A as a raw material, removes sulfur from the pressurized city gas to the ppb level, and is converted to hydrogen-rich gas by a steam reforming catalyst. The hydrogen-rich gas is obtained by converting carbon monoxide in the hydrogen-rich gas into carbon dioxide with a catalyst for modification, and further removing excess water.
Each hydrogen purification tower 1, 2 and 3 is appropriately adsorbed to purify high purity hydrogen by adsorbing and removing impurities such as water, carbon dioxide, carbon monoxide, methane and nitrogen from the hydrogen rich gas under pressure. The agent is contained.

各水素精製塔１，２，３は、高純度水素排出路６に対してそれぞれ排出用分岐路６ａ，６ｂ，６ｃを介して互いに並列に接続され、各排出用分岐路６ａ，６ｂ，６ｃにそれぞれ排出用電磁弁７ａ，７ｂ，７ｃが設けられ、高純度水素排出路６には水素貯蔵タンク８が接続されている。
さらに、各水素精製塔１，２，３は、均圧用分岐路９ａ，９ｂ，９ｃを介して均圧路９に互いに並列に接続され、各均圧用分岐路９ａ，９ｂ，９ｃにはそれぞれ均圧用電磁弁１０ａ，１０ｂ，１０ｃが設けられ、均圧路９の端部は、第３水素精製塔３における排出用分岐路６ｃとの接続箇所より下流側において高純度水素排出路６に接続され、その接続箇所より上流側の均圧路９にも均圧用電磁弁１０ｄが設けられている。 The hydrogen purification towers 1, 2, and 3 are connected to the high-purity hydrogen discharge path 6 in parallel with each other via discharge branch paths 6a, 6b, and 6c, respectively, and are connected to the discharge branch paths 6a, 6b, and 6c. Discharge solenoid valves 7 a, 7 b and 7 c are provided, respectively, and a hydrogen storage tank 8 is connected to the high purity hydrogen discharge path 6.
Further, each of the hydrogen purification towers 1, 2 and 3 is connected in parallel to the pressure equalizing passage 9 via the pressure equalizing branches 9a, 9b and 9c, and the pressure equalizing branches 9a, 9b and 9c are respectively connected to the pressure equalizing branches 9a, 9b and 9c. Pressure solenoid valves 10a, 10b, and 10c are provided, and an end portion of the pressure equalizing passage 9 is connected to the high-purity hydrogen discharge passage 6 on the downstream side of the connection portion with the discharge branch passage 6c in the third hydrogen purification tower 3. A pressure equalizing solenoid valve 10d is also provided in the pressure equalizing path 9 upstream of the connection location.

各水素精製塔１，２，３の供給用分岐路４ａ，４ｂ，４ｃには、オフガス排出路の一部となるオフガス分岐路１１ａ，１１ｂ，１１ｃが接続され、各水素精製塔１，２，３が、そのオフガス分岐路１１ａ，１１ｂ，１１ｃを介してオフガス排出路１１に並列に接続されるとともに、各オフガス分岐路１１ａ，１１ｂ，１１ｃにそれぞれオフガス電磁弁１２ａ，１２ｂ，１２ｃが設けられている。
そのオフガス排出路１１には、オフガスタンク１３が接続され、オフガスタンク１３より上流側のオフガス排出路１１にオフガス排出弁としてのオフガス排出電磁弁１４が設けられ、そのオフガスタンク１３とオフガス使用機器の一例であるバーナ１５がオフガス供給路１６により接続されている。 Off-gas branch paths 11a, 11b, 11c, which are part of the off-gas discharge path, are connected to the supply branch paths 4a, 4b, 4c of the hydrogen purification towers 1, 2, 3, respectively. 3 is connected in parallel to the offgas discharge passage 11 via the offgas branch passages 11a, 11b, and 11c, and offgas solenoid valves 12a, 12b, and 12c are provided in the offgas branch passages 11a, 11b, and 11c, respectively. Yes.
An offgas tank 13 is connected to the offgas discharge path 11, and an offgas discharge electromagnetic valve 14 as an offgas discharge valve is provided in the offgas discharge path 11 upstream of the offgas tank 13. An example burner 15 is connected by an off-gas supply path 16.

そのオフガス供給路１６には、第１の減圧弁１７ａが設けられ、オフガス排出電磁弁１４、オフガスタンク１３、および、第１の減圧弁１７ａをバイパスしてオフガス排出路１１とオフガス供給路１６を接続するオフガスバイパス路１８が設けられている。そして、そのオフガスバイパス路１８には、オフガスバイパス弁としてのオフガスバイパス電磁弁１９が設けられ、オフガスバイパス路１８の接続箇所よりも下流側のオフガス供給路１６に第２の減圧弁１７ｂが設けられている。
このような構成からなる水素製造装置は、その作動の全てが自動制御されるように構成され、そのため、制御手段２０が、供給用電磁弁５ａ〜５ｃ、排出用電磁弁７ａ〜７ｃ、均圧用電磁弁１０ａ〜１０ｄ、オフガス電磁弁１２ａ〜１２ｃ、オフガス排出電磁弁１４、および、オフガスバイパス電磁弁１９などを開閉制御するように構成されている。 The off-gas supply path 16 is provided with a first pressure reducing valve 17a. The off-gas discharge path 11 and the off-gas supply path 16 are bypassed by bypassing the off-gas discharge electromagnetic valve 14, the off-gas tank 13, and the first pressure reducing valve 17a. An off-gas bypass path 18 to be connected is provided. The offgas bypass passage 18 is provided with an offgas bypass electromagnetic valve 19 as an offgas bypass valve, and a second pressure reducing valve 17b is provided in the offgas supply passage 16 on the downstream side of the connection location of the offgas bypass passage 18. ing.
The hydrogen production apparatus having such a configuration is configured such that all of its operations are automatically controlled. Therefore, the control means 20 includes supply solenoid valves 5a to 5c, discharge solenoid valves 7a to 7c, and pressure equalization. The solenoid valves 10a to 10d, the off-gas solenoid valves 12a to 12c, the off-gas discharge solenoid valve 14, the off-gas bypass solenoid valve 19 and the like are configured to be opened and closed.

つぎに、この水素製造装置の作動と運転方法につき、図２の運転工程図と図３の運転説明図を参照しながら説明する。
水素リッチガス供給路４からの水素リッチガスは、第１〜第３の水素精製塔１，２，３のいずれかに供給されて高純度水素に精製される。
例えば、第１水素精製塔１において精製される場合であれば、図３の（イ）に示すように、供給用電磁弁５ａの開弁によって第１水素精製塔１に水素リッチガスが供給され、加圧下においてその水素リッチガス中に含まれる水、二酸化炭素、一酸化炭素、メタン、窒素などの不純物を吸着剤に吸着させて高純度水素を精製する吸着工程を実行し、精製された高純度水素は、排出用電磁弁７ａの開弁に伴って排出用分岐路６ａと高純度水素排出路６を通って水素貯蔵タンク８へ送られて貯蔵される。
その際、第２水素精製塔２と第３水素精製塔３においては、均圧電磁弁１０ｂ，１０ｃの開弁に伴って均圧工程が実行され、バーナ１５へオフガスを供給する必要があれば、オフガスタンク１３内のオフガスは、第１の減圧弁１７ａと第２の減圧弁１７ｂを通ってバーナ１５へ供給される。 Next, the operation and operation method of this hydrogen production apparatus will be described with reference to the operation process diagram of FIG. 2 and the operation explanatory diagram of FIG.
The hydrogen rich gas from the hydrogen rich gas supply path 4 is supplied to one of the first to third hydrogen purification towers 1, 2, and 3 to be purified to high purity hydrogen.
For example, in the case of purification in the first hydrogen purification tower 1, as shown in FIG. 3 (a), the hydrogen rich gas is supplied to the first hydrogen purification tower 1 by opening the supply electromagnetic valve 5a. Purified high-purity hydrogen by performing an adsorption process that purifies high-purity hydrogen by adsorbing impurities such as water, carbon dioxide, carbon monoxide, methane, and nitrogen contained in the hydrogen-rich gas under pressure to the adsorbent Is sent to the hydrogen storage tank 8 through the discharge branch path 6a and the high-purity hydrogen discharge path 6 in association with the opening of the discharge electromagnetic valve 7a.
At that time, in the second hydrogen purification tower 2 and the third hydrogen purification tower 3, a pressure equalization process is executed as the pressure equalization electromagnetic valves 10b and 10c are opened, and it is necessary to supply off-gas to the burner 15. The off gas in the off gas tank 13 is supplied to the burner 15 through the first pressure reducing valve 17a and the second pressure reducing valve 17b.

その後、均圧電磁弁１０ｂ，１０ｃの閉弁に伴って第２水素精製塔２と第３水素精製塔３における均圧工程が終了した後、図３の（ロ）に示すように、第２水素精製塔２においては、排出用電磁弁７ｂの開弁によって第１水素精製塔１からの高純度水素が供給されて昇圧工程が実行され、第３水素精製塔３においては、オフガス電磁弁１２ｃの開弁によって減圧（１）工程が実行される。
すなわち、第３水素精製塔３では、減圧下において吸着剤に吸着された不純物が脱離されて取り除かれ、その不純物を含むオフガスが、オフガス排出電磁弁１４の開弁に伴ってオフガス分岐路１１ｃとオフガス排出路１１を介してオフガスタンク１３へ供給されて貯蔵される。
その際、バーナ１８へオフガスを供給する必要があれば、オフガスタンク１３内のオフガスが、第１の減圧弁１７ａと第２の減圧弁１７ｂを通ってバーナ１５へ供給される。 Thereafter, after the pressure equalization process in the second hydrogen purification tower 2 and the third hydrogen purification tower 3 is completed with the closing of the pressure equalization solenoid valves 10b and 10c, as shown in FIG. In the hydrogen purification tower 2, the high-purity hydrogen from the first hydrogen purification tower 1 is supplied by opening the discharge electromagnetic valve 7b, and the pressure increasing process is executed. In the third hydrogen purification tower 3, the off-gas solenoid valve 12c The decompression (1) step is executed by opening the valve.
That is, in the third hydrogen purification tower 3, the impurities adsorbed by the adsorbent under reduced pressure are desorbed and removed, and the offgas containing the impurities is turned off as the offgas discharge electromagnetic valve 14 is opened. And supplied to the off-gas tank 13 via the off-gas discharge path 11 and stored.
At this time, if it is necessary to supply the off gas to the burner 18, the off gas in the off gas tank 13 is supplied to the burner 15 through the first pressure reducing valve 17a and the second pressure reducing valve 17b.

そして、第３水素精製塔３内の圧力が設定値以下になると、図３の（ハ）に示すように、オフガス排出電磁弁１４が閉弁され、代わりにオフガスバイパス電磁弁１９が開弁されて、第３水素精製塔３において減圧（２）工程が実行される。
その際、第３水素精製塔３からのオフガスは、オフガスタンク１３をバイパスしてオフガスバイパス路１８を通流するため、第３水素精製塔３内は所望どおりに減圧され、第３水素精製塔３からのオフガスは、第２の減圧弁１７ｂを通ってバーナ１５へ供給される。
そして、オフガスタンク１３内のオフガスも、第１の減圧弁１７ａと第２の減圧弁１７ｂを通ってバーナ１５へ供給される。 When the pressure in the third hydrogen purification tower 3 becomes equal to or lower than the set value, the off-gas discharge solenoid valve 14 is closed and the off-gas bypass solenoid valve 19 is opened instead, as shown in FIG. Thus, the depressurization (2) step is performed in the third hydrogen purification tower 3.
At this time, the off-gas from the third hydrogen purification tower 3 bypasses the off-gas tank 13 and flows through the off-gas bypass 18 so that the inside of the third hydrogen purification tower 3 is depressurized as desired. 3 is supplied to the burner 15 through the second pressure reducing valve 17b.
The off gas in the off gas tank 13 is also supplied to the burner 15 through the first pressure reducing valve 17a and the second pressure reducing valve 17b.

その後、第３水素精製塔３においては、排出用電磁弁７ｃの開弁によって第１水素精製塔１からの高純度水素が供給されて洗浄工程が実行され、減圧下において吸着剤に吸着された不純物を脱離させて高純度水素で洗浄し、その洗浄工程の実行により発生したオフガスも、オフガスバイパス路１８と第２の減圧弁１７ｂを通ってバーナ１５へ供給され、この場合にも、オフガスタンク１３内のオフガスは、第１の減圧弁１７ａと第２の減圧弁１７ｂを通ってバーナ１５へ供給される。
そして、各水素精製塔１，２，３において、このような各工程が繰り返し実行されて、水素リッチガスから高純度水素が連続的に製造され、各水素精製塔１，２，３およびオフガスタンク１３からのオフガスは、少なくとも第２の減圧弁１７ｂを通ってバーナ１５へ供給されて燃焼される。 Thereafter, in the third hydrogen purification tower 3, the high purity hydrogen from the first hydrogen purification tower 1 is supplied by opening the discharge solenoid valve 7c, the washing process is executed, and it is adsorbed by the adsorbent under reduced pressure. The off-gas generated by desorbing impurities and cleaning with high-purity hydrogen and executing the cleaning process is also supplied to the burner 15 through the off-gas bypass 18 and the second pressure reducing valve 17b. The off gas in the gas tank 13 is supplied to the burner 15 through the first pressure reducing valve 17a and the second pressure reducing valve 17b.
Then, in each of the hydrogen purification towers 1, 2 and 3, such steps are repeatedly executed to continuously produce high-purity hydrogen from the hydrogen-rich gas, and each of the hydrogen purification towers 1, 2, 3 and the off-gas tank 13 Is supplied to the burner 15 through at least the second pressure reducing valve 17b and burned.

〔別実施形態〕
先の実施形態では、合計３つの水素精製塔１，２，３を備えた水素製造装置を例示して説明したが、水素精製塔の個数は任意であり、また、オフガス使用機器の一例としてバーナ１５を示したが、バーナ以外の各種のオフガス使用機器を備えた水素製造装置においても適用可能である。 [Another embodiment]
In the previous embodiment, the hydrogen production apparatus including a total of three hydrogen purification columns 1, 2, and 3 has been described as an example. However, the number of hydrogen purification columns is arbitrary, and a burner is used as an example of an off-gas using device. However, the present invention is also applicable to a hydrogen production apparatus equipped with various off-gas using devices other than the burner.

水素製造装置の全体を示す概略構成図Schematic configuration diagram showing the entire hydrogen production system 水素製造装置の運転状態を示す工程図Process diagram showing the operating state of the hydrogen production system 水素製造装置の運転状態を示す説明図Explanatory drawing showing the operating state of the hydrogen production system

符号の説明Explanation of symbols

１〜３ 第１水素精製塔
１１，１１ａ〜１１ｃ オフガス排出路
１３ オフガスタンク
１４ オフガス排出弁
１５ オフガス使用機器としてのバーナ
１６ オフガス供給路
１７ａ 第１の減圧弁
１７ｂ 第２の減圧弁
１８ オフガスバイパス路
１９ オフガスバイパス弁

1-3 First hydrogen purification tower 11, 11a-11c Off-gas discharge path 13 Off-gas tank 14 Off-gas discharge valve 15 Burner as off-gas using equipment 16 Off-gas supply path 17a First pressure-reducing valve 17b Second pressure-reducing valve 18 Off-gas bypass path 19 Off-gas bypass valve

Claims (3)

吸着剤を収容する水素精製塔と、その水素精製塔からのオフガスを貯蔵するオフガスタンクとオフガスを使用するオフガス使用機器を備え、前記水素精製塔とオフガスタンクを接続するオフガス排出路にオフガス排出弁が設けられ、前記オフガスタンクとオフガス使用機器を接続するオフガス供給路に減圧弁が設けられて、前記オフガス排出弁、オフガスタンク、および、減圧弁をバイパスして前記オフガス排出路とオフガス供給路を接続するオフガスバイパス路にオフガスバイパス弁が設けられている水素製造装置であって、
前記オフガスバイパス路とオフガス供給路との接続箇所より下流側のオフガス供給路に第２の減圧弁が設けられている水素製造装置。 An off-gas discharge valve is provided in an off-gas discharge path connecting the hydrogen purification tower and the off-gas tank, comprising a hydrogen purification tower containing the adsorbent, an off-gas tank for storing off-gas from the hydrogen purification tower, and an off-gas using device for using the off-gas. A pressure reducing valve is provided in an off gas supply path that connects the off gas tank and the off gas using device, and the off gas discharge path, the off gas tank, and the pressure reducing valve are bypassed to connect the off gas discharge path and the off gas supply path. A hydrogen production apparatus in which an off-gas bypass valve is provided in an off-gas bypass path to be connected,
A hydrogen production apparatus, wherein a second pressure reducing valve is provided in an offgas supply path downstream from a connection point between the offgas bypass path and the offgas supply path. 前記水素精製塔を複数備え、それら複数の水素精製塔が前記オフガス排出路に並列に接続されている請求項１に記載の水素製造装置。   The hydrogen production apparatus according to claim 1, comprising a plurality of the hydrogen purification towers, wherein the plurality of hydrogen purification towers are connected in parallel to the off-gas discharge passage. 前記オフガス使用機器が、オフガスを燃料とするバーナである請求項１または２に記載の水素製造装置。   The hydrogen production apparatus according to claim 1 or 2, wherein the off-gas using device is a burner using off-gas as fuel.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02160601A (en) * 1988-12-15 1990-06-20 Kawasaki Heavy Ind Ltd Production of hydrogen by methanol reforming and apparatus therefor
JPH07248112A (en) * 1994-03-14 1995-09-26 Komatsugawa Sanso Kk Portable type fuel feeder
JP2002355522A (en) * 2001-05-31 2002-12-10 Tokyo Gas Co Ltd Method of controlling pressure of offgas from offgas tank in four tower-type psa equipment for purifying hydrogen
JP2004299994A (en) * 2003-03-31 2004-10-28 Osaka Gas Co Ltd Hydrogen production apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02160601A (en) * 1988-12-15 1990-06-20 Kawasaki Heavy Ind Ltd Production of hydrogen by methanol reforming and apparatus therefor
JPH07248112A (en) * 1994-03-14 1995-09-26 Komatsugawa Sanso Kk Portable type fuel feeder
JP2002355522A (en) * 2001-05-31 2002-12-10 Tokyo Gas Co Ltd Method of controlling pressure of offgas from offgas tank in four tower-type psa equipment for purifying hydrogen
JP2004299994A (en) * 2003-03-31 2004-10-28 Osaka Gas Co Ltd Hydrogen production apparatus

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