JP2008226602A - Temperature control system of reformer in fuel cell device - Google Patents

Temperature control system of reformer in fuel cell device Download PDF

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JP2008226602A
JP2008226602A JP2007062089A JP2007062089A JP2008226602A JP 2008226602 A JP2008226602 A JP 2008226602A JP 2007062089 A JP2007062089 A JP 2007062089A JP 2007062089 A JP2007062089 A JP 2007062089A JP 2008226602 A JP2008226602 A JP 2008226602A
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temperature
reformer
desulfurizer
fuel
fuel cell
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JP5379353B2 (en
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Seisaku Azumaguchi
誠作 東口
Masami Hamaso
正美 濱走
Kenichiro Yasuhara
健一郎 安原
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Osaka Gas Co Ltd
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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
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    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

<P>PROBLEM TO BE SOLVED: To lower CO concentration in a reformed gas to a value below a predetermined value without degrading desulfurization efficiency even when temperature variation of an ambient environment due to season or temporal change due to an individual difference of operation of a system occurs, to prevent voltage drop of a fuel cell from being caused, to improve reliability of the system, to improve durability of a catalyst of a low-temperature reactor, and to improve durability of the system. <P>SOLUTION: The fuel cell device is provided with: a fuel reform part 5 having a desulfurizer 1, a reformer 2, a CO converter 3, and a CO remover 4 on this order from the upstream side to produce hydrogen from a fuel gas; and a fuel cell part 6 generating power by reacting the hydrogen produced by the fuel reform part 5 with oxygen; and is structured to exchange heat between the fuel gas before being supplied to the desulfurizer 1 and the reformed gas on the downstream side of the reformer 2. By detecting the temperature of the desulfurizer 1 or/and the temperature of the CO converter 3, the temperature of the reformer 2 is controlled based on the detected temperature(s). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、燃料電池装置における改質器の温度制御システムに関するものである。   The present invention relates to a temperature control system for a reformer in a fuel cell device.

従来から、上流側から順に脱硫器、改質器、ＣＯ変成器、ＣＯ除去器を有して燃料ガスから水素を製造する燃料改質部と、燃料改質部で製造された水素に酸素を反応させて発電する燃料電池部とを備え、脱硫器に供給される燃料ガスとＣＯ除去器から燃料電池部のアノードに送られる改質ガスとを熱交換するように構成した燃料電池装置が特許文献１などにより知られている。   Conventionally, a fuel reformer that has a desulfurizer, a reformer, a CO converter, and a CO remover in order from the upstream side to produce hydrogen from fuel gas, and oxygen to the hydrogen produced by the fuel reformer Patent application title: FUEL CELL DEVICE, comprising a fuel cell unit that reacts to generate electricity, and configured to exchange heat between the fuel gas supplied to the desulfurizer and the reformed gas sent from the CO remover to the anode of the fuel cell unit It is known from Document 1 and the like.

上記のような従来の燃料電池装置においては、一般的に改質器の温度をある一定値に設定するようになっている。しかしながら、季節による周囲環境の温度変化や、システムの固体差や運転による経時変化により、他の低温反応器（脱硫器やＣＯ変成器）の温度が変化し、本来の性能が出せなくなる。低温反応器の温度が最適な温度を逸脱すると、脱硫効率が低下し、また、改質ガス中のＣＯ濃度が上がり、燃料電池の電圧低下を招く他、システムの信頼性を低下させるという問題がある。また、低温反応器の触媒温度が高い場合は、触媒自体の耐久性を損ない、システムの耐久性を低下させるという問題がある。
特開２００２−２５５８８号公報 In the conventional fuel cell apparatus as described above, the temperature of the reformer is generally set to a certain value. However, the temperature of other low-temperature reactors (desulfurizers and CO converters) changes due to changes in the temperature of the surrounding environment due to the season, changes in the system due to differences in the system, and changes over time, and the original performance cannot be achieved. If the temperature of the low-temperature reactor deviates from the optimum temperature, the desulfurization efficiency is reduced, the CO concentration in the reformed gas is increased, the voltage of the fuel cell is lowered, and the reliability of the system is lowered. is there. Moreover, when the catalyst temperature of a low temperature reactor is high, there exists a problem that durability of a catalyst itself is impaired and durability of a system is reduced.
JP 2002-25588 A

本発明は上記の従来の問題点に鑑みて発明したものであって、季節による周囲環境の温度変化や、システムの固体差や運転による経時変化があっても、脱硫効率が低下せず、改質ガス中のＣＯ濃度を所定値以下に下げることができて、燃料電池の電圧低下を招くことが無く、また、システムの信頼性を向上させ、低温反応器の触媒の耐久性を向上させ、システムの耐久性を向上させることができる燃料電池装置における改質器の温度制御システムを提供することを課題とするものである。   The present invention has been invented in view of the above-mentioned conventional problems, and even if there is a change in the temperature of the surrounding environment due to the season, a difference in system solids or a change over time due to operation, the desulfurization efficiency does not decrease, and the improvement is made. The CO concentration in the gaseous gas can be lowered to a predetermined value or less, so that the fuel cell voltage is not lowered, the system reliability is improved, and the durability of the catalyst in the low temperature reactor is improved. It is an object of the present invention to provide a temperature control system for a reformer in a fuel cell device that can improve the durability of the system.

上記課題を解決するために本発明に係る燃料電池装置における改質器の温度制御システムは、上流側から順に脱硫器１、改質器２、ＣＯ変成器３、ＣＯ除去器４を有して燃料ガスから水素を製造する燃料改質部５と、燃料改質部５で製造された水素に酸素を反応させて発電する燃料電池部６とを備え、脱硫器１に供給される前の燃料ガスと、改質器２よりも下流側の改質ガスとの間で熱交換するように構成した燃料電池装置において、脱硫器１温度又は／及びＣＯ変成器３温度を検出して、該検出温度に基づいて改質器２の温度を制御することを特徴とするものである。   In order to solve the above problems, a reformer temperature control system in a fuel cell apparatus according to the present invention includes a desulfurizer 1, a reformer 2, a CO converter 3, and a CO remover 4 in order from the upstream side. The fuel before being supplied to the desulfurizer 1 is provided with a fuel reforming section 5 that produces hydrogen from the fuel gas, and a fuel cell section 6 that generates electricity by reacting oxygen with the hydrogen produced by the fuel reforming section 5. In the fuel cell device configured to exchange heat between the gas and the reformed gas downstream of the reformer 2, the temperature of the desulfurizer 1 and / or the CO converter 3 is detected and detected. The temperature of the reformer 2 is controlled based on the temperature.

このような構成とすることで、脱硫器１温度又は／及びＣＯ変成器３温度があらかじめ設定された最適な温度範囲を外れた場合は、改質器２の温度を下げたり、上げたりする制御を行って、低温反応器（脱硫器１やＣＯ変成器３）の温度を最適の温度範囲にすることができ、脱硫効率が低下せず、改質ガス中のＣＯ濃度を所定濃度以下にすることができ、また、低温反応器の触媒温度が所定温度よりも高くなるのを防止して触媒自体の耐久性を向上できる。   By adopting such a configuration, when the temperature of the desulfurizer 1 or / and the temperature of the CO converter 3 deviates from the preset optimum temperature range, the temperature of the reformer 2 is lowered or raised. The temperature of the low-temperature reactor (desulfurizer 1 or CO converter 3) can be adjusted to the optimum temperature range, the desulfurization efficiency does not decrease, and the CO concentration in the reformed gas is reduced to a predetermined concentration or less. In addition, the durability of the catalyst itself can be improved by preventing the catalyst temperature of the low temperature reactor from becoming higher than a predetermined temperature.

本発明は、脱硫器温度又は／及びＣＯ変成器温度を検出して、検出温度に基づいて改質器の温度を制御するので、季節による周囲環境の温度変化や、システムの固体差や運転による経時変化があっても、脱硫器やＣＯ変成器を本来の最適の温度にすることができて、脱硫効率が低下せず、改質ガス中のＣＯ濃度を所定値以下に下げることができて、燃料電池の電圧低下を招くことが無く、また、システムの信頼性を向上させるという効果があり、また、低温反応器の触媒温度が所定温度よりも高くなるのを防止して触媒の耐久性を向上させることができ、システムの耐久性を向上させることができるという効果がある。   In the present invention, the temperature of the reformer is controlled based on the detected temperature by detecting the desulfurizer temperature or / and the CO converter temperature. Even if there is a change over time, the desulfurizer and CO converter can be brought to the original optimum temperature, the desulfurization efficiency is not lowered, and the CO concentration in the reformed gas can be lowered to a predetermined value or less. In addition, the fuel cell voltage is not reduced, the system reliability is improved, and the catalyst temperature of the low temperature reactor is prevented from becoming higher than a predetermined temperature, thereby improving the durability of the catalyst. And the durability of the system can be improved.

以下、本発明を添付図面に示す実施形態に基いて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

本発明の燃料電池装置は、図 の概略構成図に示すように、燃料改質部５と燃料電池部６とよりなる。   The fuel cell device of the present invention comprises a fuel reforming unit 5 and a fuel cell unit 6 as shown in the schematic configuration diagram of FIG.

燃料改質部５は、都市ガスのような燃料ガス（プロセスガス）から水素を製造するためのもので、上流側から順に脱硫器１、改質器２、ＣＯ変成器３、ＣＯ除去器４を備えている。   The fuel reforming unit 5 is for producing hydrogen from a fuel gas (process gas) such as city gas. The desulfurizer 1, the reformer 2, the CO converter 3, and the CO remover 4 are sequentially installed from the upstream side. It has.

脱硫器１は都市ガスのような燃料ガスを脱硫するためのものである。脱硫器１で脱硫した燃料ガスには改質用スチーム発生器８で発生させた水蒸気を混合するようになっており、脱硫され且つ水蒸気が混合された燃料ガスは改質器２に送られる。   The desulfurizer 1 is for desulfurizing fuel gas such as city gas. The fuel gas desulfurized by the desulfurizer 1 is mixed with water vapor generated by the reforming steam generator 8, and the fuel gas desulfurized and mixed with water vapor is sent to the reformer 2.

改質器２は改質器バーナ９を有しており、改質器バーナ９を燃焼させることで、改質触媒を加熱しながら前述のように都市ガスに水蒸気を混合した燃料ガスを水蒸気改質反応により改質するようになっており、改質器２で改質されたガスはＣＯ変成器３でＣＯ変成を行い、ＣＯ変成器３でＣＯ変成を行ったＣＯ変成ガスはＣＯ除去器４に送られ、ＣＯ除去器４でＣＯ選択酸化を行って一酸化炭素を除去してＣＯ濃度の低い水素リッチの改質ガスを製造するようになっている。   The reformer 2 has a reformer burner 9, and by burning the reformer burner 9, the fuel gas in which the city gas is mixed with steam as described above is steam-modified while the reforming catalyst is heated. The gas reformed by the reformer 2 is CO-converted by the CO converter 3, and the CO-converted gas that has been CO-converted by the CO converter 3 is the CO remover. 4, CO selective oxidation is performed by the CO remover 4 to remove carbon monoxide, and a hydrogen-rich reformed gas having a low CO concentration is produced.

燃料電池部６は、アノード（燃料極）１２、電解質１３、カソード（空気極）１４が層となったセルを一単位とし、このセルをセパレータ（図示せず）を介して多数積層して構成してある。ここで、アノード１２、カソード１４は気体を通す構造をしており、図２に示すように上記燃料改質部５で製造した水素リッチの改質ガス、つまり水素をアノード１２に供給し、カソード１４にブロアから空気を供給することで、水素はアノード１２中の触媒の働きで電子を切り離して水素イオンになり、電解質１３はイオンしか通さないという性質を持っているため、切り離された電子は外に出て行き、電解質の中を移動した水素イオンは、反対側のカソード１４に送られた酸素と、外部から電線（外部回路）を通して戻ってきた電子と反応して水となる。このようにして発電した電気は直流なので、直流交流変換装置１０により交流に変換するようになっている。   The fuel cell unit 6 is formed by stacking a large number of cells each having a layer of an anode (fuel electrode) 12, an electrolyte 13, and a cathode (air electrode) 14 via separators (not shown). It is. Here, the anode 12 and the cathode 14 have a structure that allows gas to pass through, and as shown in FIG. 2, the hydrogen-rich reformed gas produced by the fuel reforming unit 5, that is, hydrogen is supplied to the anode 12, and the cathode By supplying air from the blower to the hydrogen 14, hydrogen is separated into electrons by the action of the catalyst in the anode 12 to become hydrogen ions, and the electrolyte 13 has a property that only ions pass through. The hydrogen ions that have gone out and moved in the electrolyte react with oxygen sent to the cathode 14 on the opposite side and electrons returned from the outside through an electric wire (external circuit) to become water. Since the electricity generated in this way is direct current, it is converted to alternating current by the direct current alternating current converter 10.

燃料電池部６のアノード１２から排気されるアノードオフガスは残水素を含んでいるため、アノードオフガス管路１６を介して改質器２の改質器バーナ９に送られて燃料ガスとして利用されるようになっており、またこの改質器バーナ９には前記の都市ガス、空気も供給され、残水素を含むアノードオフガスと都市ガスと空気とを混合して改質器バーナ９で燃焼させることで、前述のように改質触媒を加熱しながら都市ガスに水蒸気を混合した燃料ガスを改質するようになっている。改質器バーナ９の燃焼排ガスは燃焼排ガス排気管路１７を介して排出される。   Since the anode off-gas exhausted from the anode 12 of the fuel cell unit 6 contains residual hydrogen, it is sent to the reformer burner 9 of the reformer 2 via the anode off-gas line 16 and used as fuel gas. The reformer burner 9 is also supplied with the city gas and air, and the anode off-gas containing residual hydrogen, city gas and air are mixed and burned in the reformer burner 9. As described above, the fuel gas obtained by mixing the city gas with water vapor is reformed while heating the reforming catalyst. The combustion exhaust gas from the reformer burner 9 is discharged via the combustion exhaust gas exhaust line 17.

燃料電池部６のカソード１４から排出されるカソードオフガスはカソードオフガス管路１８を介して排出される。   Cathode off-gas discharged from the cathode 14 of the fuel cell unit 6 is discharged via a cathode off-gas conduit 18.

また、燃料電池部６は電池冷却水循環管路１９を循環する電池冷却水により冷却するようになっている。   The fuel cell unit 6 is cooled by battery cooling water circulating through the battery cooling water circulation pipe 19.

ここで、本発明においては脱硫器１に供給される前の燃料ガスと、改質器２よりも下流側の改質ガスとの間で熱交換部２１で熱交換して、脱硫器１に供給される燃料ガスを脱硫器１においては脱硫触媒により付臭剤中の硫黄化合物を除去するための脱硫反応に適した温度となるようにしている。   Here, in the present invention, heat is exchanged between the fuel gas before being supplied to the desulfurizer 1 and the reformed gas on the downstream side of the reformer 2 in the heat exchanging unit 21. In the desulfurizer 1, the supplied fuel gas is set to a temperature suitable for a desulfurization reaction for removing sulfur compounds in the odorant by a desulfurization catalyst.

図 に示す実施形態では改質器２よりも下流側のＣＯ除去器４から燃料電池部６のアノード１２に送られる改質ガスと、脱硫器１に供給される前の燃料ガスとを熱交換部２１で熱交換し、燃料ガスを加熱するようになっている。   In the embodiment shown in the figure, heat exchange is performed between the reformed gas sent from the CO remover 4 downstream of the reformer 2 to the anode 12 of the fuel cell unit 6 and the fuel gas before being supplied to the desulfurizer 1. Heat is exchanged in the section 21 to heat the fuel gas.

脱硫器１やＣＯ変成器３は改質器２よりも低温で反応させる低温反応器であり、この低温反応器である脱硫器１やＣＯ変成器３には温度センサ２３が設けてある。温度センサ２３としては脱硫器１内の温度を検出する温度センサ２３ａ、ＣＯ変成器３内の温度（例としてはＣＯ変成器３の出口温度）を検出する温度センサ２３ｂがあり、図１に示す実施形態では、脱硫器１及びＣＯ変成器３にそれぞれ温度センサ２３ａ、２３ｂを設けた例が示してあるが、脱硫器１のみに温度センサ２３ａを設ける場合、あるいは、ＣＯ変成器３のみに温度センサ２３ｂを設ける場合であってもよい。   The desulfurizer 1 and the CO converter 3 are low-temperature reactors that react at a lower temperature than the reformer 2, and the desulfurizer 1 and the CO converter 3 that are the low-temperature reactors are provided with a temperature sensor 23. As the temperature sensor 23, there are a temperature sensor 23a for detecting the temperature in the desulfurizer 1, and a temperature sensor 23b for detecting the temperature in the CO converter 3 (for example, the outlet temperature of the CO converter 3), which are shown in FIG. In the embodiment, the temperature sensors 23a and 23b are provided in the desulfurizer 1 and the CO converter 3, respectively. However, when the temperature sensor 23a is provided only in the desulfurizer 1, or only in the CO converter 3 is a temperature. The case where the sensor 23b is provided may be sufficient.

この温度センサ２３による脱硫器１内の検出温度又は／及びＣＯ変成器３内の検出温度の情報に基づいて制御部２４により改質器バーナ９を制御して、改質器２の温度を制御するようになっている。   Based on the detected temperature in the desulfurizer 1 and / or the detected temperature in the CO converter 3 by the temperature sensor 23, the controller 24 controls the reformer burner 9 to control the temperature of the reformer 2. It is supposed to be.

すなわち、制御部２４には、脱硫器１における脱硫触媒による脱硫反応に適した温度範囲、ＣＯ変成器３におけるＣＯ変成のためのシフト反応に適した温度範囲があらかじめ登録してあり、上記温度センサ２３により検出した脱硫器１内の温度又は／及びＣＯ変成器３内の温度が、上記あらかじめ登録された脱硫反応に適した温度範囲又は／及びＣＯ変成のためのシフト反応に適した温度範囲を外れないように改質器バーナ９に供給される都市ガスの流量を調整することにより行う。実施形態では改質器バーナ９に都市ガスを供給するガス供給管２６に設けた調整弁２７を調整することで都市ガスの流量を調整し、改質器２の温度を制御するようになっている。   That is, the temperature range suitable for the desulfurization reaction by the desulfurization catalyst in the desulfurizer 1 and the temperature range suitable for the shift reaction for the CO conversion in the CO converter 3 are registered in the controller 24 in advance, and the temperature sensor The temperature in the desulfurizer 1 or / and the temperature in the CO converter 3 detected by 23 is a temperature range suitable for the previously registered desulfurization reaction or / and a temperature range suitable for a shift reaction for CO conversion. This is done by adjusting the flow rate of the city gas supplied to the reformer burner 9 so that it does not come off. In the embodiment, the flow rate of the city gas is adjusted by adjusting the adjustment valve 27 provided in the gas supply pipe 26 that supplies the city gas to the reformer burner 9, and the temperature of the reformer 2 is controlled. Yes.

ところで、夏場、あるいは雰囲気温度が高い場所で燃料電池装置を運転すると、低温反応器である脱硫器１やＣＯ変成器３の温度が本来の脱硫器１やＣＯ変成器３における性能を引き出すための温度より高くなる（つまり、あらかじめ登録してある脱硫反応に適した温度範囲やＣＯ変成のためのシフト反応に適した温度範囲を外れる）。このような場合は、調整弁２７を調整して都市ガスの流量が少なくなるように制御して改質器２の温度を下げ、これにより、脱硫器１やＣＯ変成器３の温度をあらかじめ登録してある脱硫反応に適した温度範囲やＣＯ変成のためのシフト反応に適した温度範囲とするのである。また、逆に冬場、あるいは雰囲気温度が低い場所で燃料電池装置を運転すると、低温反応器である脱硫器１やＣＯ変成器３の温度が本来の脱硫器１やＣＯ変成器３における性能を引き出すための温度より低くなる（つまり、あらかじめ登録してある脱硫反応に適した温度範囲やＣＯ変成のためのシフト反応に適した温度範囲を外れる）。このような場合は、調整弁２７を調整して都市ガスの流量が多くなるように制御して改質器２の温度を上げ、これにより、脱硫器１やＣＯ変成器３の温度をあらかじめ登録してある脱硫反応に適した温度範囲やＣＯ変成のためのシフト反応に適した温度範囲とするのである。   By the way, when the fuel cell device is operated in summer or in a place where the atmospheric temperature is high, the temperature of the desulfurizer 1 and the CO converter 3 which are low-temperature reactors is used to bring out the performance of the original desulfurizer 1 and the CO converter 3. It becomes higher than the temperature (that is, outside the temperature range suitable for the desulfurization reaction registered in advance and the temperature range suitable for the shift reaction for CO conversion). In such a case, the temperature of the reformer 2 is lowered by adjusting the regulating valve 27 so as to reduce the flow rate of the city gas, thereby preliminarily registering the temperatures of the desulfurizer 1 and the CO converter 3. Therefore, the temperature range is suitable for the desulfurization reaction and the temperature range suitable for the shift reaction for CO conversion. Conversely, when the fuel cell device is operated in winter or in a place where the ambient temperature is low, the temperature of the desulfurizer 1 and the CO converter 3 that are low-temperature reactors brings out the performance of the original desulfurizer 1 and the CO converter 3. (That is, out of the temperature range suitable for the desulfurization reaction registered in advance and the temperature range suitable for the shift reaction for CO conversion). In such a case, the temperature of the reformer 2 is raised by adjusting the regulating valve 27 so as to increase the flow rate of the city gas, thereby preliminarily registering the temperatures of the desulfurizer 1 and the CO converter 3. Therefore, the temperature range is suitable for the desulfurization reaction and the temperature range suitable for the shift reaction for CO conversion.

このようにして簡易な方法で、低温反応器である脱硫器１やＣＯ変成器３の温度をそれぞれ適温に保ち、設置場所の雰囲気温度や季節変動によらず、反応器である脱硫器１やＣＯ変成器３における本来の性能を確実に引き出すことができ、システムの信頼性、耐久性を高めることができる。   In this way, the temperature of the desulfurizer 1 and the CO converter 3 that are low-temperature reactors is kept at an appropriate temperature by a simple method, and the desulfurizer 1 that is a reactor is maintained regardless of the atmospheric temperature and seasonal variations at the installation site. The original performance of the CO transformer 3 can be reliably extracted, and the reliability and durability of the system can be improved.

上記例では改質器バーナ９に供給する都市ガスの量を制御して改質器２の温度制御を行う例で説明したが、プロセスガス量を制御することで改質器２の温度制御を行うようにしてもよく、また、改質器バーナ９に供給する都市ガスの量及びプロセスガス量の双方を制御することで改質器２の温度制御を行うようにしてもよい。   In the above example, the temperature of the reformer 2 is controlled by controlling the amount of city gas supplied to the reformer burner 9, but the temperature control of the reformer 2 can be controlled by controlling the amount of process gas. Alternatively, the temperature of the reformer 2 may be controlled by controlling both the amount of city gas supplied to the reformer burner 9 and the amount of process gas.

以下、本発明の一例を具体的に説明する。   Hereinafter, an example of the present invention will be specifically described.

燃料電池装置において、従来から脱硫器１やＣＯ変成器３の温度は、改質器２の出口温度（出口における改質ガスの温度）によりなりゆきの温度となるように設計されており、このような従来の制御ではシステムの外気温が４０℃変化した場合、低温反応器である脱硫器１やＣＯ変成器３の温度の温度は約３０℃変化していた。例えば、改質器２の出口温度は通常６５０℃前後に設定してあり、この改質器２の設定温度以下では冬場の脱硫器１温度は２８０℃、ＣＯ変成器３の出口温度は１８０℃程度であり、良好な温度分布でシステム運転を行うことが可能である。   Conventionally, in the fuel cell device, the temperature of the desulfurizer 1 and the CO converter 3 is designed so as to become a temperature that depends on the outlet temperature of the reformer 2 (the temperature of the reformed gas at the outlet). In the conventional control, when the outside air temperature of the system changes by 40 ° C., the temperature of the desulfurizer 1 and the CO converter 3 which are low temperature reactors changes by about 30 ° C. For example, the outlet temperature of the reformer 2 is normally set to around 650 ° C. Below this set temperature of the reformer 2, the temperature of the desulfurizer 1 in winter is 280 ° C., and the outlet temperature of the CO converter 3 is 180 ° C. It is possible to operate the system with a good temperature distribution.

しかしながら、この改質器２の出口温度のまま夏場の運転を実施すると、脱硫器１温度は３１０℃ＣＯ変成器３の出口温度は２１０℃程度となり、脱硫器１の触媒は耐久性を担保するための温度（２００℃）を越え、また、ＣＯ変成器３はＣＯ変成器３の出口のＣＯ濃度０．５％以下を担保するための温度（２００℃）を越える結果となる。   However, if summer operation is carried out with the outlet temperature of the reformer 2, the temperature of the desulfurizer 1 becomes 310 ° C, the outlet temperature of the CO converter 3 becomes about 210 ° C, and the catalyst of the desulfurizer 1 ensures durability. As a result, the CO converter 3 exceeds the temperature (200 ° C.) for ensuring the CO concentration of 0.5% or less at the outlet of the CO converter 3.

そこで、本発明においては、脱硫器１温度が３００℃、もしくはＣＯ変成器３の出口温度が２００℃を越えた場合は、改質器２の出口温度設定を１０℃下げる制御をするものである。   Therefore, in the present invention, when the temperature of the desulfurizer 1 is 300 ° C. or the outlet temperature of the CO converter 3 exceeds 200 ° C., the outlet temperature setting of the reformer 2 is controlled to be lowered by 10 ° C. .

また、逆に、脱硫器１の温度が２６０℃、もしくはＣＯ変成器３の出口温度が１６０℃を下回る場合は改質器２の出口温度設定を１０℃上げる制御をするものである。   Conversely, when the temperature of the desulfurizer 1 is 260 ° C. or the outlet temperature of the CO converter 3 is lower than 160 ° C., the outlet temperature setting of the reformer 2 is controlled to be raised by 10 ° C.

本発明の燃料電池装置の概略構成図である。It is a schematic block diagram of the fuel cell apparatus of this invention. 同上の概略説明図である。It is a schematic explanatory drawing same as the above.

符号の説明Explanation of symbols

１ 脱硫器
２ 改質器
３ ＣＯ変成器
４ ＣＯ除去器
５ 燃料改質部
６ 燃料電池部
DESCRIPTION OF SYMBOLS 1 Desulfurizer 2 Reformer 3 CO converter 4 CO remover 5 Fuel reforming part 6 Fuel cell part

Claims (1)

上流側から順に脱硫器、改質器、ＣＯ変成器、ＣＯ除去器を有して燃料ガスから水素を製造する燃料改質部と、燃料改質部で製造された水素に酸素を反応させて発電する燃料電池部とを備え、脱硫器に供給される前の燃料ガスと、改質器よりも下流側の改質ガスとの間で熱交換するように構成した燃料電池装置において、脱硫器温度又は／及びＣＯ変成器温度を検出して、該検出温度に基づいて改質器の温度を制御することを特徴とする燃料電池装置における改質器の温度制御システム。

In order from the upstream side, there are a desulfurizer, a reformer, a CO converter, and a CO remover. A fuel reformer that produces hydrogen from fuel gas, and oxygen reacted with the hydrogen produced in the fuel reformer A fuel cell device comprising a fuel cell unit for generating electricity and configured to exchange heat between a fuel gas before being supplied to a desulfurizer and a reformed gas downstream from the reformer. A temperature control system for a reformer in a fuel cell device, wherein the temperature of the reformer is detected based on the detected temperature or / and the CO transformer temperature.

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JP2010222209A (en) * 2009-03-25 2010-10-07 Panasonic Corp Hydrogen generating device and fuel cell power generator using the same
JP2012104384A (en) * 2010-11-10 2012-05-31 Osaka Gas Co Ltd Fuel cell power generation system
KR101188017B1 (en) * 2010-08-11 2012-10-05 현대하이스코 주식회사 Prediction method of replacement time of catalyst in reformer for fuel cell and apparatus for the same
JP2012206905A (en) * 2011-03-30 2012-10-25 Osaka Gas Co Ltd Hydrogen-containing gas producing apparatus

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JP2010222209A (en) * 2009-03-25 2010-10-07 Panasonic Corp Hydrogen generating device and fuel cell power generator using the same
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JP2012104384A (en) * 2010-11-10 2012-05-31 Osaka Gas Co Ltd Fuel cell power generation system
JP2012206905A (en) * 2011-03-30 2012-10-25 Osaka Gas Co Ltd Hydrogen-containing gas producing apparatus

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