JP2010270942A - Cogeneration system - Google Patents

Cogeneration system Download PDF

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JP2010270942A
JP2010270942A JP2009121655A JP2009121655A JP2010270942A JP 2010270942 A JP2010270942 A JP 2010270942A JP 2009121655 A JP2009121655 A JP 2009121655A JP 2009121655 A JP2009121655 A JP 2009121655A JP 2010270942 A JP2010270942 A JP 2010270942A
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hot water
water storage
storage tank
power generation
pipe
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Hiroaki Suga
宏明 菅
Masatomo Yoshimura
昌知 吉村
Juichi Okada
寿一 岡田
Kohei Yamaguchi
耕平 山口
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Panasonic Corp
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Panasonic 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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Abstract

<P>PROBLEM TO BE SOLVED: To dispense with a switch valve for switching a warm water flow channel, to simplify control and to reduce costs. <P>SOLUTION: This cogeneration system includes a power generation unit 101, a hot water storage unit 102, and a heat collecting circuit for heating the water at a lower part of the hot water storage tank 102 by utilizing exhaust heat in power generation of the power generation unit 101 to prepare warm water, and returning the warm water to an upper part of the hot water storage tank 105. A pipe 106 for returning the warm water to the upper part of the hot water storage tank 105 is kept into contact with the hot water storage tank 105 in a state that heat can be exchanged, thus a temperature of the warm water at the upper part of the hot water storage tank 105 is not significantly lowered, the switch valve is unnecessary, the control can be simplified, and the costs can be reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、エンジン発電機や燃料電池のように排熱を発生する発電機で発電する際に、発電機の排熱を利用して給湯を行なうことができるようにしたコジェネレーションシステムに関するものである。   The present invention relates to a cogeneration system in which hot water can be supplied using exhaust heat of a generator when generating electricity with a generator that generates exhaust heat such as an engine generator or a fuel cell. is there.

従来の排熱を給湯に使用することを目的としたコジェネレーションシステムでは次に記載されているようなものがあった（例えば、特許文献１参照）。   A conventional cogeneration system intended to use waste heat for hot water supply has been described (for example, see Patent Document 1).

図３は前記特許文献１に記載された従来のコジェネレーションシステムを示すものである。図３に示すように、従来のコジェネレーションシステムは発電ユニット１と貯湯ユニット２より構成され、発電ユニット１と貯湯ユニット２は熱回収配管３，４と貯湯タンク５上部に戻す配管６と貯湯タンク５に戻さずに熱回収配管４に接続されるバイパス配管７で構成され、循環ポンプ８により水を循環させている。発電ユニット１と貯湯ユニット２を循環する水は、貯湯タンク５の下部より循環ポンプ８を通り、発電機９の排熱で排熱回収熱交換器１０により加熱し温水となる。温水は、貯湯タンク５の上部温度を低下させないようにするために、温度センサー１１で検出され、その温度が貯湯タンク５の上部の温度よりも高い時は貯湯タンク５上部に戻す配管６によって貯湯タンク５の上部に搬送される。ここで加熱された熱回収の温水の温度が貯湯タンク５の上部の温度よりも低い時は切替弁１２によってバイパス配管７に搬送され回路内を循環する。また、水は、給水配管１３で供給され、給湯として使用されるお湯１４は貯湯タンク５上部から給湯配管１５の温水と給水配管１３の水を混合弁１６で所定の温度に混合し出湯される。   FIG. 3 shows a conventional cogeneration system described in Patent Document 1. As shown in FIG. 3, the conventional cogeneration system includes a power generation unit 1 and a hot water storage unit 2, and the power generation unit 1 and the hot water storage unit 2 return to the heat recovery pipes 3 and 4 and the hot water storage tank 5 above the pipe 6 and the hot water storage tank. The bypass pipe 7 is connected to the heat recovery pipe 4 without returning to 5, and water is circulated by the circulation pump 8. The water circulating through the power generation unit 1 and the hot water storage unit 2 passes through the circulation pump 8 from the lower part of the hot water storage tank 5 and is heated by the exhaust heat recovery heat exchanger 10 with the exhaust heat of the generator 9 to become hot water. The hot water is detected by the temperature sensor 11 so as not to lower the upper temperature of the hot water storage tank 5, and when the temperature is higher than the upper temperature of the hot water storage tank 5, the hot water is stored by a pipe 6 that returns to the upper part of the hot water storage tank 5. It is conveyed to the upper part of the tank 5. When the temperature of the heated hot water recovered here is lower than the temperature of the upper part of the hot water storage tank 5, it is conveyed to the bypass pipe 7 by the switching valve 12 and circulated in the circuit. Further, water is supplied through the water supply pipe 13, and hot water 14 used as hot water is discharged from the upper part of the hot water storage tank 5 by mixing hot water in the hot water supply pipe 15 and water in the water supply pipe 13 to a predetermined temperature by the mixing valve 16. .

特開平１１−２２３３８５号公報JP-A-11-223385

しかしながら、前記従来の構成では、排熱回収した水の温度によって切替弁で、流路を切り替える必要があり、制御が複雑になると共にコストが増加するという課題を有していた。   However, in the conventional configuration, it is necessary to switch the flow path with a switching valve depending on the temperature of the recovered water, and there is a problem that the control becomes complicated and the cost increases.

本発明は、前記従来の課題を解決するもので、水の流路制御を簡略化すると共にコスト低減が図れるコジェネレーションシステムを提供することを目的とする。   The present invention solves the above-described conventional problems, and an object thereof is to provide a cogeneration system that simplifies the flow control of water and can reduce the cost.

前記従来の課題を解決するために、本発明のコジェネレーションシステムは、発電ユニットの発電時の排熱を利用して加熱した温水を貯湯タンクの上部に戻す配管を貯湯タンクに熱交換可能に接触させたものである。   In order to solve the above-mentioned conventional problems, the cogeneration system of the present invention contacts a hot water tank so that heat can be exchanged with a pipe that returns hot water heated using exhaust heat generated during power generation to the upper part of the hot water tank. It has been made.

これによって、熱回収された温水の温度が低い場合においても、貯湯タンクの熱によって、配管を流れる温水の温度を上げることができ、切替弁を廃止することができることになる。   Thereby, even when the temperature of the hot water recovered by heat is low, the temperature of the hot water flowing through the pipe can be raised by the heat of the hot water storage tank, and the switching valve can be eliminated.

また、本発明のコジェネレーションシステムは、温水を貯湯タンクの上部に戻す配管を、貯湯タンクの上部に向かって貯湯タンクに螺旋状に巻き付けたことで配管と貯湯タンク
の熱交換効率を向上させたものである。 In addition, the cogeneration system of the present invention improves the heat exchange efficiency between the piping and the hot water storage tank by spirally winding the piping that returns the hot water to the upper part of the hot water storage tank toward the upper part of the hot water storage tank. Is.

これによって、熱回収された温水の温度が低い場合においても、貯湯タンクの熱によって、配管を流れる温水の温度を安定して上げることができ、貯湯タンク上部に戻す温水の温度を安定して保つことができるので、切替弁を廃止できることになる   As a result, even when the temperature of the hot water recovered is low, the temperature of the hot water flowing through the piping can be stably raised by the heat of the hot water storage tank, and the temperature of the hot water returning to the upper part of the hot water storage tank can be kept stable. Switchable valve can be abolished

本発明のコジェネレーションシステムは、切替弁を不要とすることができるので、流路切り替えの制御が不要になると共にコストを低減させることができる。   Since the cogeneration system of the present invention can eliminate the switching valve, it is not necessary to control the flow path switching, and the cost can be reduced.

本発明の実施の形態１におけるコジェネレーションシステムの構成図Configuration diagram of cogeneration system in Embodiment 1 of the present invention 本発明の実施の形態２におけるコジェネレーションシステムの構成図Configuration diagram of cogeneration system in Embodiment 2 of the present invention 従来のコジェネレーションシステムの構成図Configuration diagram of a conventional cogeneration system

第１の発明は、発電ユニットと、貯湯ユニットと、前記貯湯タンクの下部の水を前記発電ユニットの発電時の排熱を利用して加熱して温水とし前記温水を前記貯湯タンクの上部に戻す熱回収回路とを備え、前記温水を前記貯湯タンクの上部に戻す配管を前記貯湯タンクに熱交換可能に接触させたことにより、熱回収配管を流れる温水の温度によって流路を切り替える制御を行っていた切替弁を廃止することができ、制御の簡素化とコスト低減を図ることができる。   1st invention heats the water of the lower part of a power generation unit, a hot water storage unit, and the said hot water storage tank using the waste heat at the time of the power generation of the said power generation unit, makes warm water, and returns the said hot water to the upper part of the said hot water storage tank A heat recovery circuit, and a pipe for returning the hot water to the upper part of the hot water storage tank is brought into contact with the hot water storage tank so that heat can be exchanged. The switching valve can be abolished, and control can be simplified and cost can be reduced.

第２の発明は、特に第１の発明の温水を前記貯湯タンクの上部に戻す配管を、前記貯湯タンクの上部に向かって前記貯湯タンクに螺旋状に巻き付けたことを特徴としたことで、貯湯タンクに流入する温水の温度をより安定化することができる。   The second invention is characterized in that, in particular, a pipe for returning the hot water of the first invention to the upper part of the hot water storage tank is spirally wound around the hot water storage tank toward the upper part of the hot water storage tank. The temperature of the hot water flowing into the tank can be further stabilized.

以下、本発明の実施の形態について、図面を参照にしながら説明する。なお、本実施の形態によって本発明が限定されるものではない。   Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the present embodiment.

（実施の形態１）
図１は、本発明の実施の形態１における燃料電池コジェネレーションシステムの構成図である。図１において、燃料電池コジェネレーションシステムは、発電ユニット１０１と貯湯ユニット１０２より構成され、発電ユニット１０１と貯湯ユニット１０２は熱回収配管１０３，１０４と貯湯タンク１０５上部に戻す配管１０６で構成され、循環ポンプ１０７により水を循環させている。発電ユニット１０１と貯湯ユニット１０２を循環する水は、貯湯タンク１０５の下部より循環ポンプ１０７を通り、発電機１０８の排熱で排熱回収熱交換器１０９により加熱し温水となって、熱回収配管１０３と貯湯タンク１０５の上部に戻す配管を流れ、貯湯タンク１０５内に貯められる。貯湯タンク１０５内に貯められた温水は、貯湯タンク１０５の上部の給湯配管１１０より流出し、給水配管１１１より供給される水と混合弁１１２により所定の温度に調整され、出湯口１１３より出湯される。また、給水配管１１１は貯湯タンク１０５の下部より貯湯タンク１０５内に流入し、出湯１１３で使用された水量に見合う分を供給する。本発明の実施の形態では、貯湯タンク１０５の上部に戻す配管１０６と貯湯タンク１０５を熱交換できるように接触させているので、配管１０６を流れる温水の温度が低い場合でも、貯湯タンク１０５の熱を熱配管１０６が受け取ることができるので、貯湯タンク１０５の上部に配管１０６の温水が到達するときには、貯湯タンク１０５の上部温度近くまで温度が上昇し、貯湯タンク１０５の上部温度を著しく低下させることがない。 (Embodiment 1)
FIG. 1 is a configuration diagram of a fuel cell cogeneration system according to Embodiment 1 of the present invention. In FIG. 1, the fuel cell cogeneration system includes a power generation unit 101 and a hot water storage unit 102, and the power generation unit 101 and the hot water storage unit 102 include heat recovery pipes 103 and 104 and a pipe 106 that returns to the upper part of the hot water storage tank 105. Water is circulated by the pump 107. The water circulating through the power generation unit 101 and the hot water storage unit 102 passes through the circulation pump 107 from the lower part of the hot water storage tank 105 and is heated by the exhaust heat recovery heat exchanger 109 with the exhaust heat of the generator 108 to become hot water, thereby becoming a heat recovery pipe. 103 and a pipe returning to the upper part of the hot water storage tank 105, and stored in the hot water storage tank 105. The hot water stored in the hot water storage tank 105 flows out of the hot water supply pipe 110 at the top of the hot water storage tank 105, is adjusted to a predetermined temperature by the water supplied from the water supply pipe 111 and the mixing valve 112, and is discharged from the hot water outlet 113. The The water supply pipe 111 flows into the hot water storage tank 105 from the lower part of the hot water storage tank 105 and supplies an amount corresponding to the amount of water used in the hot water 113. In the embodiment of the present invention, since the pipe 106 returned to the upper part of the hot water storage tank 105 and the hot water storage tank 105 are brought into contact with each other so that heat can be exchanged, the heat of the hot water storage tank 105 can be obtained even when the temperature of the hot water flowing through the pipe 106 is low. Therefore, when the hot water in the pipe 106 reaches the upper portion of the hot water storage tank 105, the temperature rises to near the upper temperature of the hot water storage tank 105, and the upper temperature of the hot water storage tank 105 is significantly reduced. There is no.

以上のように、本実施の形態においては、発電ユニット１０１と、貯湯ユニット１０２
と、貯湯タンク１０５の下部の水を発電ユニット１０１の発電時の排熱を利用して加熱して温水とし温水を貯湯タンク１０５の上部に戻す熱回収回路とを備え、温水を貯湯タンクの上部に戻す配管１０６を貯湯タンク１０５に熱交換可能に接触させたことにより、配管１０６を流れる温水の温度が低い場合においても、貯湯タンク１０５上部に流入する時点では、貯湯タンク１０５上部の温度近くまで、上昇させることができるので、貯湯タンク１０５上部の温度を著しく低下させることはない。これにより切替弁は不要で切替弁制御も不必要となり、コストを低減させることを可能とすることができる。 As described above, in the present embodiment, the power generation unit 101 and the hot water storage unit 102 are used.
And a heat recovery circuit that heats the water in the lower part of the hot water storage tank 105 using the exhaust heat generated during the power generation of the power generation unit 101 to produce hot water, and returns the hot water to the upper part of the hot water storage tank 105. Since the pipe 106 to be returned to the hot water storage tank 105 is brought into contact with the hot water storage tank 105, even when the temperature of the hot water flowing through the pipe 106 is low, when the hot water flows into the hot water storage tank 105, the temperature is close to the upper temperature of the hot water storage tank 105. Therefore, the temperature at the upper part of the hot water storage tank 105 is not significantly lowered. As a result, the switching valve is not required and the switching valve control is not necessary, and the cost can be reduced.

なお、配管１０６と貯湯タンク１０５を接触させた状態の上に断熱材を巻くことで、更に貯湯タンク１０５上部に流入する温度を安定させることができる。   In addition, the temperature which flows in into the hot water storage tank 105 upper part can be further stabilized by winding a heat insulating material on the state which made the piping 106 and the hot water storage tank 105 contact.

（実施の形態２）
図２は、本発明の実施の形態２における燃料電池コジェネレーションシステムの構成図である。図２において、燃料電池コジェネレーションシステムは、発電ユニット１０１と貯湯ユニット１０２より構成され、発電ユニット１０１と貯湯ユニット１０２は熱回収配管１０３，１０４と貯湯タンク１０５上部に戻す配管１０６で構成され、循環ポンプ１０７により水を循環させている。発電ユニット１０１と貯湯ユニット１０２を循環する水は、貯湯タンク１０５の下部より循環ポンプ１０７を通り、発電機１０８の排熱で排熱回収熱交換器１０９により加熱し温水となって、熱回収配管１０３と貯湯タンク１０５の上部に戻す配管を流れ貯湯タンク１０５内に貯められる。貯湯タンク１０５内に貯められた温水は、貯湯タンク１０５の上部の給湯配管１１０より流出し、給水配管１１１より供給される水と混合弁１１２により所定の温度に調整され、出湯口１１３より出湯される。また、給水配管１１１は貯湯タンク１０５の下部より貯湯タンク１０５内に流入し、出湯１１３で使用された水量に見合う分を供給する。本発明の実施の形態では、温水を貯湯タンク１０５の上部に戻す配管１０６を、貯湯タンク１０５の上部に向かって貯湯タンク１０５に螺旋状に巻き付けているので、配管１０６を流れる温水の温度が低い場合でも、貯湯タンク１０５の熱を熱配管１０６が受け取ることができるので、貯湯タンク１０５の上部に配管１０６の温水が到達するときには、貯湯タンク１０５の上部温度近くまで温度が上昇し、貯湯タンク１０５の上部温度を著しく低下させることがない。 (Embodiment 2)
FIG. 2 is a configuration diagram of a fuel cell cogeneration system according to Embodiment 2 of the present invention. In FIG. 2, the fuel cell cogeneration system includes a power generation unit 101 and a hot water storage unit 102, and the power generation unit 101 and the hot water storage unit 102 include heat recovery pipes 103 and 104 and a pipe 106 that returns to the upper part of the hot water storage tank 105. Water is circulated by the pump 107. The water circulating through the power generation unit 101 and the hot water storage unit 102 passes through the circulation pump 107 from the lower part of the hot water storage tank 105 and is heated by the exhaust heat recovery heat exchanger 109 with the exhaust heat of the generator 108 to become hot water, thereby becoming a heat recovery pipe. A pipe returning to the upper part of 103 and the hot water storage tank 105 flows and is stored in the hot water storage tank 105. The hot water stored in the hot water storage tank 105 flows out of the hot water supply pipe 110 at the top of the hot water storage tank 105, is adjusted to a predetermined temperature by the water supplied from the water supply pipe 111 and the mixing valve 112, and is discharged from the hot water outlet 113. The The water supply pipe 111 flows into the hot water storage tank 105 from the lower part of the hot water storage tank 105 and supplies an amount corresponding to the amount of water used in the hot water 113. In the embodiment of the present invention, the pipe 106 for returning the hot water to the upper part of the hot water storage tank 105 is spirally wound around the hot water storage tank 105 toward the upper part of the hot water storage tank 105, so the temperature of the hot water flowing through the pipe 106 is low. Even in this case, since the heat pipe 106 can receive the heat of the hot water storage tank 105, when the hot water in the pipe 106 reaches the upper part of the hot water storage tank 105, the temperature rises to near the upper temperature of the hot water storage tank 105, and the hot water storage tank 105. There is no significant decrease in the upper temperature.

以上のように、本実施の形態においては、発電ユニット１０１と、貯湯ユニット１０２と、貯湯タンク１０５の下部の水を発電ユニット１０１の発電時の排熱を利用して加熱して温水とし温水を貯湯タンク１０５の上部に戻す熱回収回路とを備え、温水を貯湯タンク１０５の上部に戻す配管１０６を、貯湯タンク１０５の上部に向かって貯湯タンク１０５に螺旋状に巻き付けたことにより、配管１０６を流れる温水の温度が低い場合においても、貯湯タンク１０５上部に流入する時点では、貯湯タンク１０５上部の温度近くまで、安定して上昇させることができるので、貯湯タンク１０５上部の温度を著しく低下させることはない。これにより切替弁は不要で切替弁制御も不必要となり、コストを低減させることを可能とすることができる。   As described above, in the present embodiment, the water in the lower part of the power generation unit 101, the hot water storage unit 102, and the hot water storage tank 105 is heated using the exhaust heat generated during power generation to generate hot water. A heat recovery circuit for returning the hot water to the upper part of the hot water storage tank 105 is provided, and the pipe 106 for returning the hot water to the upper part of the hot water storage tank 105 is spirally wound around the hot water storage tank 105 toward the upper part of the hot water storage tank 105. Even when the temperature of the flowing hot water is low, when it flows into the upper part of the hot water storage tank 105, it can be stably raised to near the temperature of the upper part of the hot water storage tank 105. There is no. As a result, the switching valve is not required and the switching valve control is not necessary, and the cost can be reduced.

なお、配管１０６と貯湯タンク１０５を接触させた状態の上に断熱材を巻くことで、更に貯湯タンク１０５上部に流入する温度を安定させることができる。   In addition, the temperature which flows in into the hot water storage tank 105 upper part can be further stabilized by winding a heat insulating material on the state which made the piping 106 and the hot water storage tank 105 contact.

本発明のコジェネレーションシステムによれば、発電機の排熱回収温度が低くても、貯湯タンク上部に流入させる温水の温度を安定させることができるので、切替弁を廃止することができ、制御を簡素化できると共にコスト低減できるので、燃料電池用等の特に低コストが求められるコジェネレーションシステムに適している。   According to the cogeneration system of the present invention, even if the exhaust heat recovery temperature of the generator is low, the temperature of hot water flowing into the upper part of the hot water storage tank can be stabilized. Since it can be simplified and the cost can be reduced, it is suitable for a cogeneration system that requires particularly low cost such as for a fuel cell.

１０１ 発電ユニット
１０２ 貯湯ユニット
１０５ 貯湯タンク
１０６ 配管 101 Power generation unit 102 Hot water storage unit 105 Hot water storage tank 106 Piping

Claims (2)

発電ユニットと、貯湯タンクを有する貯湯ユニットと、前記貯湯タンクの下部の水を前記発電ユニットの発電時の排熱を利用して加熱して温水とし前記温水を前記貯湯タンクの上部に戻す熱回収回路とを備え、前記温水を前記貯湯タンクの上部に戻す配管を前記貯湯タンクに熱交換可能に接触させたコジェネレーションシステム。 A power generation unit, a hot water storage unit having a hot water storage tank, and heat recovery by heating the water in the lower part of the hot water storage tank using the exhaust heat generated during power generation to generate hot water and returning the hot water to the upper part of the hot water storage tank A cogeneration system comprising a circuit and a pipe for returning the hot water to the upper part of the hot water storage tank in contact with the hot water storage tank so that heat can be exchanged. 前記温水を前記貯湯タンクの上部に戻す配管を、前記貯湯タンクの上部に向かって前記貯湯タンクに螺旋状に巻き付けた請求項１記載のコジェネレーションシステム。 The cogeneration system according to claim 1, wherein a pipe for returning the hot water to the upper part of the hot water storage tank is spirally wound around the hot water storage tank toward the upper part of the hot water storage tank.
JP2009121655A 2009-05-20 2009-05-20 Cogeneration system Pending JP2010270942A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014029805A (en) * 2012-07-31 2014-02-13 Noritz Corp Fuel cell cogeneration system and hot water storage tank unit
JP2017026288A (en) * 2015-07-28 2017-02-02 株式会社ガスター Heat source device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014029805A (en) * 2012-07-31 2014-02-13 Noritz Corp Fuel cell cogeneration system and hot water storage tank unit
JP2017026288A (en) * 2015-07-28 2017-02-02 株式会社ガスター Heat source device

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