JP2015105803A - Exhaust heat recovery device - Google Patents

Exhaust heat recovery device Download PDF

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JP2015105803A
JP2015105803A JP2013248843A JP2013248843A JP2015105803A JP 2015105803 A JP2015105803 A JP 2015105803A JP 2013248843 A JP2013248843 A JP 2013248843A JP 2013248843 A JP2013248843 A JP 2013248843A JP 2015105803 A JP2015105803 A JP 2015105803A
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condenser
cooling medium
temperature
flow rate
temperature sensor
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JP6111184B2 (en
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高橋　和雄
Kazuo Takahashi
和雄 高橋
正剛 戸島
Masatake Toshima
正剛 戸島
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Kobe Steel 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • 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

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device that can determine whether clogging occurs in a supply pipe for supplying cooling refrigerant from an external cooling source to a condenser.SOLUTION: An exhaust heat recovery device 1 includes: an evaporator 10 evaporating a working medium; an expander 12 into which the working medium flowed out from the evaporator 10 flows; a driving machine 14 connected to the expander 12; a condenser 16 condensing the working medium flowed out from the expander 12 by cooling it with cooling refrigerant supplied through a supply pipe 52; and a determination unit 40 determining whether a preset clogging condition indicating clogging of the supply pipe 52 is established.

Description

本発明は、排熱回収装置に関するものである。   The present invention relates to an exhaust heat recovery apparatus.

従来、工場等の各種の設備からの排熱を回収し、その回収された排熱のエネルギーを利用することにより低沸点の作動媒体から動力を取り出す排熱回収装置が知られている。例えば、特許文献１には、液状の作動媒体を蒸発させる蒸発器と、蒸発器から流出したガス状の作動媒体が流入する膨張機と、膨張機に接続された発電機と、膨張機から流出した作動媒体を凝縮させる凝縮器と、凝縮器から流出した液状の作動媒体を加圧して蒸発器へ送出するポンプと、を備えた排熱発電装置（バイナリー発電装置）が開示されている。   2. Description of the Related Art Conventionally, there has been known an exhaust heat recovery apparatus that recovers exhaust heat from various facilities such as factories and uses the recovered exhaust heat energy to extract power from a low-boiling working medium. For example, Patent Document 1 discloses an evaporator for evaporating a liquid working medium, an expander into which a gaseous working medium flowing out from the evaporator flows in, a generator connected to the expander, and an outflow from the expander. An exhaust heat power generation device (binary power generation device) is disclosed that includes a condenser that condenses the working medium and a pump that pressurizes the liquid working medium flowing out of the condenser and sends it to the evaporator.

凝縮器内において作動媒体と熱交換することによって当該作動媒体を冷却する冷却媒体は、外部の冷却塔から供給される。凝縮器内で作動媒体と熱交換した冷却媒体は、再び冷却塔に戻される。   A cooling medium that cools the working medium by exchanging heat with the working medium in the condenser is supplied from an external cooling tower. The cooling medium heat-exchanged with the working medium in the condenser is returned to the cooling tower again.

特開２００８−３１２３３０号公報JP 2008-312330 A

上記特許文献１に示されるような排熱回収装置は、使用環境によっては、凝縮器に供給される冷却媒体の流量が低下し、これにより冷却媒体の温度上昇や、それに起因する排熱回収装置の動作不良（発電出力の低下等）を招くおそれがある。例えば、前記排熱回収装置が製鉄所等の比較的飛散体（粉塵等）の多い雰囲気で使用される場合、つまり冷却媒体の供給源である冷却塔がその雰囲気中にある場合、前記飛散体が冷却塔内に進入して冷却媒体に混入する場合がある。この場合、冷却塔から凝縮器へ冷却媒体を供給するための供給管に詰まりが生じ、これにより凝縮器に供給される冷却媒体の流量が低下するおそれがある。   In the exhaust heat recovery apparatus as shown in the above-mentioned Patent Document 1, depending on the usage environment, the flow rate of the cooling medium supplied to the condenser decreases, thereby increasing the temperature of the cooling medium and the exhaust heat recovery apparatus resulting therefrom. May cause a malfunction (such as a decrease in power generation output). For example, when the exhaust heat recovery device is used in an atmosphere with a relatively large amount of scattered matter (dust, etc.) such as a steel mill, that is, when a cooling tower that is a supply source of a cooling medium is in the atmosphere, the scattered matter May enter the cooling tower and enter the cooling medium. In this case, the supply pipe for supplying the cooling medium from the cooling tower to the condenser is clogged, which may reduce the flow rate of the cooling medium supplied to the condenser.

本発明の目的は、外部の冷却源から凝縮器に冷却媒体を供給するための供給管に詰まりが生じたか否かを判定することが可能な排熱回収装置を提供することである。   An object of the present invention is to provide an exhaust heat recovery apparatus capable of determining whether or not a supply pipe for supplying a cooling medium from an external cooling source to a condenser is clogged.

前記課題を解決する手段として、本発明は、作動媒体を蒸発させる蒸発器と、前記蒸発器から流出した作動媒体が流入する膨張機と、前記膨張機に接続された駆動機と、前記膨張機から流出した作動媒体を供給管を通じて供給される冷却媒体で冷却することによって凝縮させる凝縮器と、前記供給管の詰まりを示す予め設定された詰まり条件が成立したか否かを判定する判定部と、を備える排熱回収装置を提供する。   As means for solving the above problems, the present invention provides an evaporator for evaporating a working medium, an expander into which the working medium flowing out from the evaporator flows, a drive unit connected to the expander, and the expander A condenser that condenses the working medium that has flowed out of the supply pipe by cooling with a cooling medium supplied through a supply pipe, and a determination unit that determines whether a preset clogging condition indicating clogging of the supply pipe is satisfied. A waste heat recovery device comprising:

本装置では、判定部によって、冷却塔等の外部の冷却源から凝縮器へ冷却媒体を供給するための供給管の詰まりを示す詰まり条件が成立したか否かが判定されるので、判定部によって前記詰まり条件が成立したと判定されたときに前記供給管内の詰まりを解消することにより、凝縮器に流入する冷却媒体の流量の低下に起因する本装置の動作不良を防ぐことが可能となる。   In this apparatus, the determination unit determines whether or not a clogging condition indicating clogging of a supply pipe for supplying a cooling medium from an external cooling source such as a cooling tower to the condenser is satisfied. By eliminating the clogging in the supply pipe when it is determined that the clogging condition is satisfied, it is possible to prevent malfunction of the apparatus due to a decrease in the flow rate of the cooling medium flowing into the condenser.

この場合において、前記判定部は、前記詰まり条件が成立したときに所定信号を送信することが好ましい。   In this case, it is preferable that the determination unit transmits a predetermined signal when the clogging condition is satisfied.

このようにすれば、所定信号をアラームや開閉弁の切り替えに利用することによって簡単に供給管内の詰まりを解消することが可能となる。   In this way, the clogging in the supply pipe can be easily eliminated by using the predetermined signal for alarm or switching of the on-off valve.

例えば、前記所定信号は、管理室内のオペレータによって知覚可能なアラームとして利用されることが可能である。この場合、その信号を受けたオペレータが本装置を停止し、冷却源から延びる供給管内を清掃する、または供給管内に設けられたストレーナーを清掃することで当該供給管内の詰まりが解消される。   For example, the predetermined signal can be used as an alarm that can be perceived by an operator in the management room. In this case, the operator who receives the signal stops the apparatus and cleans the inside of the supply pipe extending from the cooling source, or cleans the strainer provided in the supply pipe, thereby eliminating the clogging in the supply pipe.

また、前記供給管が二股に分岐する一対の流路を有し、各流路にそれぞれ開閉弁とストレーナーとが設けられた構成である場合、前記所定信号を受けたオペレータが前記開閉弁の開閉を切り換えるとともに詰まりが生じているストレーナーを洗浄するという操作を繰り返すことによって、本装置を停止することなく運転を継続することが可能となる。あるいはこの場合において、前記所定信号が各開閉弁の開閉を切り換える信号に利用されることにより、自動で前記流路を切り換えること、すなわち自動で運転を継続することが可能となる。   In addition, when the supply pipe has a pair of flow paths bifurcated and an open / close valve and a strainer are provided in each flow path, an operator who has received the predetermined signal opens and closes the open / close valve. It is possible to continue the operation without stopping the present apparatus by repeating the operation of switching between and washing the strainer in which clogging has occurred. Alternatively, in this case, the predetermined signal is used as a signal for switching opening / closing of each on-off valve, so that the flow path can be automatically switched, that is, the operation can be automatically continued.

また、本発明において、前記凝縮器に流入する冷却媒体の温度を検出可能な第一温度センサと、前記凝縮器から流出した冷却媒体の温度を検出可能な第二温度センサと、をさらに備え、前記判定部は、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が予め設定された基準流量であるときの前記凝縮器から流出した冷却媒体の温度と前記凝縮器に供給される冷却媒体の温度との差である基準温度差を、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が前記基準流量であるときの前記第二温度センサの検出値と前記第一温度センサの検出値との差により算出し、この基準温度差に対し、前記第二温度センサの検出値と前記第一温度センサの検出値との差が所定値以上大きくなったときに前記詰まり条件が成立したと判定してもよい。   Further, in the present invention, further comprising a first temperature sensor capable of detecting the temperature of the cooling medium flowing into the condenser, and a second temperature sensor capable of detecting the temperature of the cooling medium flowing out of the condenser, The determination unit supplies the temperature of the cooling medium flowing out from the condenser when the flow rate of the cooling medium supplied to the condenser or out of the condenser is a preset reference flow rate and the condenser. The reference temperature difference, which is the difference from the temperature of the cooling medium to be detected, is detected by the second temperature sensor when the flow rate of the cooling medium supplied to or discharged from the condenser is the reference flow rate. And the difference between the detected value of the first temperature sensor and the difference between the detected value of the second temperature sensor and the detected value of the first temperature sensor is greater than a predetermined value with respect to the reference temperature difference. Sometimes said clogging condition It enacted and may be determined.

このようにすれば、簡単にかつ安価に凝縮器に流入する冷却媒体の流量の減少を検知することが可能となる。具体的に、凝縮器に供給される又は凝縮器から流出した冷却媒体の流量と、凝縮器から流出した冷却媒体の温度と凝縮器に流入する冷却媒体の温度との差との間には、Ｑｏｕｔ＝ｍｃΔｔの関係式が成立するので（Ｑｏｕｔは凝縮器での放熱量、ｍは冷却媒体の流量、ｃは冷却媒体の比熱、Δｔは凝縮器から流出した冷却媒体の温度と凝縮器に流入する冷却媒体の温度との差）、凝縮器での放熱量（Ｑｏｕｔ）が一定である場合においては、第二温度センサの検出値と第一温度センサの検出値との差（Δｔ）を監視することによって凝縮器に供給される又は凝縮器から流出した冷却媒体の流量（ｍ）の算出が可能となる。すなわち、凝縮器に供給される又は凝縮器から流出した冷却媒体の流量（ｍ）の前記基準流量に対する減少は、第二温度センサの検出値と第一温度センサの検出値との差（Δｔ）の前記基準温度差に対する増大によって判定可能である。よって、高価でかつ設置作業の煩雑な流量計を設けることによって冷却媒体の流量の減少を検知する（供給管の詰まりを検知する）場合に比べ、温度センサを用いることによって安価でかつ簡易に冷却媒体の流量の減少を検知することが可能となる。 This makes it possible to detect a decrease in the flow rate of the cooling medium flowing into the condenser easily and inexpensively. Specifically, between the flow rate of the cooling medium supplied to or flowing out of the condenser and the difference between the temperature of the cooling medium flowing out of the condenser and the temperature of the cooling medium flowing into the condenser, Since the relational expression Q out = mcΔt holds (Q out is the amount of heat released from the condenser, m is the flow rate of the cooling medium, c is the specific heat of the cooling medium, Δt is the temperature of the cooling medium flowing out of the condenser and the condenser Difference between the temperature of the cooling medium flowing into the condenser and the amount of heat released from the condenser (Q out ) is constant (Δt between the detection value of the second temperature sensor and the detection value of the first temperature sensor) ) Can be calculated to calculate the flow rate (m) of the cooling medium supplied to or discharged from the condenser. That is, the decrease in the flow rate (m) of the cooling medium supplied to or discharged from the condenser with respect to the reference flow rate is the difference (Δt) between the detection value of the second temperature sensor and the detection value of the first temperature sensor. Can be determined by an increase relative to the reference temperature difference. Therefore, it is cheaper and simpler to cool by using a temperature sensor than when detecting a decrease in the flow rate of the cooling medium (detecting clogging of the supply pipe) by providing an expensive and complicated flow meter. It is possible to detect a decrease in the flow rate of the medium.

あるいは、前記蒸発器への入熱量を検出可能な入熱量検出手段と、前記駆動機の出力を検出可能な出力センサと、をさらに備え、前記判定部は、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が予め設定された基準流量であるときの前記凝縮器から流出した冷却媒体の温度と前記凝縮器に供給される冷却媒体の温度との差である基準温度差を、前記入熱量検出手段の検出値、前記出力センサの検出値及び前記基準流量に基づいて算出し、この基準温度差に対し、前記第二温度センサの検出値と前記第一温度センサの検出値との差が所定値以上大きくなったときに前記詰まり条件が成立したと判定してもよい。   Alternatively, the apparatus further includes a heat input amount detection unit capable of detecting an amount of heat input to the evaporator, and an output sensor capable of detecting an output of the driver, and the determination unit is supplied to the condenser or Reference temperature difference that is the difference between the temperature of the cooling medium flowing out from the condenser and the temperature of the cooling medium supplied to the condenser when the flow rate of the cooling medium flowing out from the condenser is a preset reference flow rate Is calculated based on the detection value of the heat input detection means, the detection value of the output sensor, and the reference flow rate, and the detection value of the second temperature sensor and the detection of the first temperature sensor with respect to this reference temperature difference. It may be determined that the clogging condition is satisfied when the difference from the value becomes larger than a predetermined value.

凝縮器での放熱量（Ｑｏｕｔ）は、蒸発器への入熱量及び駆動機の出力に基づいて算出可能であるので、凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が前記基準流量であるときの各温度センサの検出値の差から直接前記基準温度差を求めることが困難であったとしても、入熱量検出手段及び出力センサを設けるという簡易な構成で基準温度差を算出することが可能となる。 The amount of heat released from the condenser (Q out ) can be calculated based on the amount of heat input to the evaporator and the output of the drive, so the flow rate of the cooling medium supplied to the condenser or flowing out of the condenser is Even if it is difficult to obtain the reference temperature difference directly from the difference between the detected values of the temperature sensors at the reference flow rate, the reference temperature difference can be obtained with a simple configuration in which a heat input amount detecting means and an output sensor are provided. It is possible to calculate.

以上のように、本発明によれば、外部の冷却源から凝縮器に冷却媒体を供給するための供給管に詰まりが生じたか否かを判定することが可能な排熱回収装置を提供することができる。   As described above, according to the present invention, there is provided an exhaust heat recovery apparatus capable of determining whether or not a supply pipe for supplying a cooling medium from an external cooling source to a condenser has been clogged. Can do.

本発明の一実施形態の排熱回収装置の構成の概略を示す図である。It is a figure which shows the outline of a structure of the waste heat recovery apparatus of one Embodiment of this invention.

本発明の一実施形態の排熱回収装置１について、図１を参照しながら説明する。   An exhaust heat recovery apparatus 1 according to an embodiment of the present invention will be described with reference to FIG.

図１に示されるように、本排熱回収装置１は、蒸発器１０と、蒸発器１０から流出したガス状の作動媒体が流入する膨張機１２と、膨張機１２に接続された駆動機１４と、膨張機１２から流出した作動媒体を凝縮させる凝縮器１６と、凝縮器１６から流出した液状の作動媒体を加圧するポンプ１８と、蒸発器１０、膨張機１２、凝縮器１６及びポンプ１８をこの順に直列に接続する循環流路２０と、各種制御を行う制御部４０と、を備えている。   As shown in FIG. 1, the exhaust heat recovery apparatus 1 includes an evaporator 10, an expander 12 into which a gaseous working medium that has flowed out of the evaporator 10 flows, and a drive machine 14 connected to the expander 12. A condenser 16 for condensing the working medium flowing out from the expander 12, a pump 18 for pressurizing the liquid working medium flowing out from the condenser 16, an evaporator 10, the expander 12, the condenser 16 and the pump 18. A circulation channel 20 connected in series in this order and a control unit 40 for performing various controls are provided.

蒸発器１０は、液状の作動媒体を蒸発させてガス状の作動媒体とする。具体的に、蒸発器１０は、作動媒体が流れる作動媒体流路１０ａと、外部の熱源から供給される加熱媒体が流れる加熱媒体流路１０ｂとを有する。作動媒体流路１０ａに流入した液状の作動媒体は、加熱媒体流路１０ｂに流入した加熱媒体と熱交換することにより蒸発する。蒸発器１０に供給される加熱媒体としては、例えば、工場等から排出される温水や高温ガスが挙げられる。   The evaporator 10 evaporates the liquid working medium into a gaseous working medium. Specifically, the evaporator 10 has a working medium flow path 10a through which a working medium flows and a heating medium flow path 10b through which a heating medium supplied from an external heat source flows. The liquid working medium flowing into the working medium flow path 10a evaporates by exchanging heat with the heating medium flowing into the heating medium flow path 10b. Examples of the heating medium supplied to the evaporator 10 include hot water and high-temperature gas discharged from a factory or the like.

膨張機１２は、循環流路２０における蒸発器１０の下流側の部位に設けられている。本実施形態では、膨張機１２として、蒸発器１０から排出されたガス状の作動媒体の膨張エネルギーにより回転駆動されるロータを有する容積式のスクリュー膨張機が用いられている。具体的に、この膨張機１２は、内部にロータ室が形成されたケーシングと、ロータ室内に回転自在に支持された雌雄一対のスクリュロータとを有している。膨張機１２では、前記ケーシングに形成された吸気口から前記ロータ室に供給された作動媒体の膨張エネルギーによって前記スクリュロータが回転駆動される。そして、前記ロータ室内で膨張することにより圧力が低下した作動媒体は、前記ケーシングに形成された排出口から循環流路２０に排出される。なお、膨張機１２としては、容積式のスクリュー膨張機に限らず、遠心式のものやスクロールタイプのもの等が用いられてもよい。   The expander 12 is provided at a site downstream of the evaporator 10 in the circulation flow path 20. In this embodiment, a positive displacement screw expander having a rotor that is rotationally driven by the expansion energy of the gaseous working medium discharged from the evaporator 10 is used as the expander 12. Specifically, the expander 12 has a casing in which a rotor chamber is formed, and a pair of male and female screw rotors rotatably supported in the rotor chamber. In the expander 12, the screw rotor is rotationally driven by the expansion energy of the working medium supplied to the rotor chamber from the air inlet formed in the casing. Then, the working medium whose pressure is reduced by expanding in the rotor chamber is discharged to the circulation flow path 20 from the discharge port formed in the casing. The expander 12 is not limited to a positive displacement screw expander, but may be a centrifugal type or a scroll type.

駆動機１４は、膨張機１２に接続されている。本実施形態では、駆動機１４として発電機が用いられている。この駆動機１４は、膨張機１２の一対のスクリュロータのうちの一方に接続された回転軸を有している。駆動機１４は、前記回転軸が前記スクリュロータの回転に伴って回転することにより電力を発生させる。   The drive machine 14 is connected to the expander 12. In the present embodiment, a generator is used as the drive machine 14. The drive machine 14 has a rotating shaft connected to one of the pair of screw rotors of the expander 12. The drive machine 14 generates electric power when the rotating shaft rotates with the rotation of the screw rotor.

凝縮器１６は、循環流路２０における膨張機１２の下流側の部位に設けられている。凝縮器１６は、膨張機１２から排出されたガス状の作動媒体を凝縮させて液状の作動媒体とする。具体的に、凝縮器１６は、作動媒体が流れる作動媒体流路１６ａと、外部の冷却源から供給される冷却媒体が流れる冷却媒体流路１６ｂとを有する。作動媒体流路１６ａに流入したガス状の作動媒体は、冷却媒体流路１６ｂに流入した冷却媒体と熱交換することにより凝縮する。凝縮器１６に供給される冷却媒体としては、例えば、外部の冷却源である冷却塔５０から供給される冷却水が挙げられる。この場合、冷却塔５０内の冷却媒体（冷却水）は、当該冷却塔５０内の冷却媒体を凝縮器１６へ供給するための供給管５２及びこの供給管５２に接続された冷却媒体導入管２２を通じて凝縮器１６へ供給される。冷却媒体導入管２２は、本排熱回収装置１の一部である。この冷却媒体導入管２２は、供給管５２の接続コネクタ５２ｃと接続可能な接続端部２２ａを有している。この接続端部２２ａと接続コネクタ５２ｃとが接続されることにより、供給管５２内の冷却媒体を凝縮器１６の冷却媒体流路１６ｂへ導入する流路が形成される。そして、凝縮器１６内で作動媒体と熱交換することによって温度が上昇した冷却媒体は、凝縮器１６に接続された冷却媒体排出管２４及びこの冷却媒体排出管２４内の冷却媒体を冷却塔５０内に戻す戻し管５８を通じて冷却塔５０に流入する。冷却媒体排出管２４は、本排熱回収装置１の一部である。この冷却媒体排出管２４は、戻し管５８の接続コネクタ５８ａと接続可能な接続端部２４ａを有している。この接続端部２４ａと接続コネクタ５８ａとが接続されることにより、冷却媒体流路１６ｂから排出された冷却媒体を戻し管５８内へ導入する流路が形成される。   The condenser 16 is provided at a site downstream of the expander 12 in the circulation flow path 20. The condenser 16 condenses the gaseous working medium discharged from the expander 12 into a liquid working medium. Specifically, the condenser 16 has a working medium flow path 16a through which the working medium flows and a cooling medium flow path 16b through which a cooling medium supplied from an external cooling source flows. The gaseous working medium flowing into the working medium flow path 16a is condensed by exchanging heat with the cooling medium flowing into the cooling medium flow path 16b. Examples of the cooling medium supplied to the condenser 16 include cooling water supplied from the cooling tower 50 that is an external cooling source. In this case, the cooling medium (cooling water) in the cooling tower 50 includes a supply pipe 52 for supplying the cooling medium in the cooling tower 50 to the condenser 16 and a cooling medium introduction pipe 22 connected to the supply pipe 52. To the condenser 16. The cooling medium introduction pipe 22 is a part of the exhaust heat recovery apparatus 1. The cooling medium introduction pipe 22 has a connection end 22 a that can be connected to the connection connector 52 c of the supply pipe 52. By connecting the connection end 22a and the connection connector 52c, a flow path for introducing the cooling medium in the supply pipe 52 into the cooling medium flow path 16b of the condenser 16 is formed. Then, the cooling medium whose temperature has been raised by exchanging heat with the working medium in the condenser 16 is used as the cooling medium discharge pipe 24 connected to the condenser 16 and the cooling medium in the cooling medium discharge pipe 24 as a cooling tower 50. It flows into the cooling tower 50 through a return pipe 58 that returns to the inside. The cooling medium discharge pipe 24 is a part of the exhaust heat recovery apparatus 1. The cooling medium discharge pipe 24 has a connection end 24 a that can be connected to the connection connector 58 a of the return pipe 58. By connecting the connection end 24a and the connection connector 58a, a flow path for introducing the cooling medium discharged from the cooling medium flow path 16b into the return pipe 58 is formed.

ポンプ１８は、循環流路２０における凝縮器１６の下流側の部位（蒸発器１０と凝縮器１６との間の部位）に設けられている。ポンプ１８は、凝縮器１６で凝縮された液状の作動媒体を所定の圧力まで加圧して循環流路２０におけるポンプ１８の下流側に送り出す。ポンプ１８としては、インペラをロータとして備える遠心ポンプや、ロータが一対のギアからなるギアポンプ等が用いられる。   The pump 18 is provided at a site downstream of the condenser 16 in the circulation channel 20 (a site between the evaporator 10 and the condenser 16). The pump 18 pressurizes the liquid working medium condensed by the condenser 16 to a predetermined pressure and sends it to the downstream side of the pump 18 in the circulation flow path 20. As the pump 18, a centrifugal pump having an impeller as a rotor, a gear pump having a rotor composed of a pair of gears, or the like is used.

これまで説明してきた排熱回収装置１が製鉄所等の比較的飛散体（粉塵等）の多い雰囲気で使用される場合、つまり冷却媒体の供給源である冷却塔５０がその雰囲気中にある場合、飛散体が冷却塔５０内に進入して冷却媒体に混入する場合がある。この場合、冷却塔５０から凝縮器１６へ冷却媒体を供給するための供給管５２に詰まりが生じ、これにより凝縮器１６に供給される冷却媒体の流量が低下するおそれがある。本実施形態の排熱回収装置１の制御部４０は、その不具合の発生を検知可能に構成されている。具体的に、制御部４０は、判定部４２と、記憶部４４とを含んでいる。   When the exhaust heat recovery apparatus 1 described so far is used in an atmosphere with a relatively large amount of scattered matter (dust etc.) such as a steel mill, that is, when the cooling tower 50 that is a supply source of the cooling medium is in the atmosphere. In some cases, the flying object enters the cooling tower 50 and enters the cooling medium. In this case, the supply pipe 52 for supplying the cooling medium from the cooling tower 50 to the condenser 16 is clogged, which may reduce the flow rate of the cooling medium supplied to the condenser 16. The control unit 40 of the exhaust heat recovery apparatus 1 of the present embodiment is configured to be able to detect the occurrence of the malfunction. Specifically, the control unit 40 includes a determination unit 42 and a storage unit 44.

判定部４２は、供給管５２の詰まりを示す予め設定された詰まり条件が成立したか否かを判定する。詰まり条件が成立したか否かは、供給管５２及び冷却媒体導入管２２を通じて凝縮器１６に流入する冷却媒体の又は凝縮器１６から流出した冷却媒体の流量（以下、「冷媒流量ｍ」という。）が減少したか否かによって判定される。具体的に、判定部４２は、冷媒流量ｍが予め設定された基準流量Ｍに対して所定量以上減少したか否かを判定する。例えば、基準流量Ｍは、冷媒流量ｍが略一定に維持されている定常運転時の冷媒流量に設定される。この基準流量Ｍは、本排熱回収装置１の起動時に予め記憶部４４に記憶される。なお、この基準流量Ｍは、供給管５２に設けられたポンプ５９が定回転数タイプのものであれば、その回転数に基づいて算出されてもよい。   The determination unit 42 determines whether or not a preset clogging condition indicating clogging of the supply pipe 52 is satisfied. Whether or not the clogging condition is satisfied is referred to as a flow rate of the cooling medium flowing into the condenser 16 through the supply pipe 52 and the cooling medium introduction pipe 22 or the cooling medium flowing out of the condenser 16 (hereinafter referred to as “refrigerant flow rate m”). ) Is reduced or not. Specifically, the determination unit 42 determines whether or not the refrigerant flow rate m has decreased by a predetermined amount or more with respect to a preset reference flow rate M. For example, the reference flow rate M is set to a refrigerant flow rate during steady operation in which the refrigerant flow rate m is maintained substantially constant. The reference flow rate M is stored in advance in the storage unit 44 when the exhaust heat recovery apparatus 1 is started. If the pump 59 provided in the supply pipe 52 is of a constant rotation speed type, the reference flow rate M may be calculated based on the rotation speed.

本実施形態では、冷媒流量ｍが基準流量Ｍに対して所定量以上減少したか否か（詰まり条件が成立したか否か）は、凝縮器１６から流出した冷却媒体の温度と凝縮器１６に流入する冷却媒体の温度との差（以下、「冷媒温度差Δｔ」という。）が基準温度差ΔＴに対して所定値以上大きくなったか否かによって判定される。基準温度差ΔＴは、冷媒流量ｍが基準流量Ｍであるとき（定常運転時）に生ずる冷媒温度差である。この基準温度差ΔＴも、基準流量Ｍと同様に、本排熱回収装置１の起動時に予め記憶部４４に記憶される。   In the present embodiment, whether or not the refrigerant flow rate m has decreased by a predetermined amount or more with respect to the reference flow rate M (whether or not the clogging condition is satisfied) is determined by the temperature of the cooling medium flowing out from the condenser 16 and the condenser 16. This is determined by whether or not the difference from the temperature of the cooling medium flowing in (hereinafter referred to as “refrigerant temperature difference Δt”) has become larger than a predetermined value with respect to the reference temperature difference ΔT. The reference temperature difference ΔT is a refrigerant temperature difference that occurs when the refrigerant flow rate m is the reference flow rate M (during steady operation). Similarly to the reference flow rate M, this reference temperature difference ΔT is also stored in the storage unit 44 in advance when the exhaust heat recovery apparatus 1 is started.

ここで、冷媒流量ｍと冷媒温度差Δｔに関しては、Ｑｏｕｔ＝ｍｃΔｔの関係式が成立するので（Ｑｏｕｔは凝縮器１６での放熱量、ｍは冷媒流量、ｃは冷却媒体の比熱、Δｔは冷媒温度差）、凝縮器１６での放熱量Ｑｏｕｔが一定である場合においては、冷媒温度差Δｔを監視することによって凝縮器１６に流入する又は凝縮器１６から流出した冷媒流量ｍの算出が可能となる。すなわち、冷媒流量ｍの基準流量Ｍに対する減少は、冷媒温度差Δｔの基準温度差ΔＴに対する増加により判定可能である。本実施形態では、凝縮器１６に流入する冷却媒体の温度は、冷却媒体導入管２２に設けられた第一温度センサ３１によって検出され、凝縮器１６から流出した冷却媒体の温度は、冷却媒体排出管２４に設けられた第二温度センサ３２によって検出される。つまり、本実施形態では、判定部４２は、第二温度センサ３２の検出値から第一温度センサ３１の検出値を引いた値（冷媒温度差Δｔ）が記憶部４４に記憶されている基準温度差ΔＴに対して所定値以上大きくなったときに詰まり条件が成立したと判定する。そして、判定部４２は、詰まり条件が成立したと判定したとき、すなわち冷媒温度差Δｔが基準温度差ΔＴに対して所定値以上大きくなった（冷媒流量ｍが基準流量Ｍに対して所定量以上減少した）と判定したとき、所定信号を送信する。 Here, with respect to the refrigerant flow rate m and the refrigerant temperature difference Δt, the relational expression Q out = mcΔt is established (Q out is the heat dissipation amount in the condenser 16, m is the refrigerant flow rate, c is the specific heat of the cooling medium, Δt Is the refrigerant temperature difference), and when the heat dissipation amount Qout in the condenser 16 is constant, the refrigerant flow rate m flowing into or out of the condenser 16 is calculated by monitoring the refrigerant temperature difference Δt. Is possible. That is, a decrease in the refrigerant flow rate m with respect to the reference flow rate M can be determined by an increase in the refrigerant temperature difference Δt with respect to the reference temperature difference ΔT. In the present embodiment, the temperature of the cooling medium flowing into the condenser 16 is detected by the first temperature sensor 31 provided in the cooling medium introduction pipe 22, and the temperature of the cooling medium flowing out of the condenser 16 is the cooling medium discharge. It is detected by a second temperature sensor 32 provided on the tube 24. That is, in the present embodiment, the determination unit 42 has a reference temperature in which a value (refrigerant temperature difference Δt) obtained by subtracting the detection value of the first temperature sensor 31 from the detection value of the second temperature sensor 32 is stored in the storage unit 44. It is determined that the clogging condition is satisfied when the difference ΔT is greater than a predetermined value. When the determination unit 42 determines that the clogging condition is satisfied, that is, the refrigerant temperature difference Δt is greater than a predetermined value with respect to the reference temperature difference ΔT (the refrigerant flow rate m is greater than or equal to a predetermined amount with respect to the reference flow rate M). When it is determined that it has decreased, a predetermined signal is transmitted.

以上説明したように、本排熱回収装置１では、判定部４２によって、外部の冷却源である冷却塔５０から凝縮器１６へ冷却媒体を供給するための供給管５２の詰まりを示す詰まり条件が成立したか否かが判定されるので、当該判定部４２によって詰まり条件が成立したと判定されたときに供給管５２内の詰まりを解消することにより、凝縮器１６に流入する冷却媒体の流量の低下に起因する本装置の動作不良を防ぐことが可能となる。   As described above, in the exhaust heat recovery apparatus 1, the determination unit 42 has a clogging condition indicating clogging of the supply pipe 52 for supplying the cooling medium from the cooling tower 50, which is an external cooling source, to the condenser 16. Since it is determined whether or not the condition is satisfied, when the determination unit 42 determines that the clogging condition is satisfied, the clogging in the supply pipe 52 is eliminated, thereby reducing the flow rate of the cooling medium flowing into the condenser 16. It is possible to prevent malfunction of the apparatus due to the decrease.

また、本実施形態では、判定部４２は、詰まり条件が成立したときに所定信号を送信するので、その所定信号をアラームや開閉弁の切り替えに利用することによって簡単に供給管５２内の詰まりを解消することが可能となる。   In the present embodiment, the determination unit 42 transmits a predetermined signal when the clogging condition is satisfied. Therefore, the clogging in the supply pipe 52 can be easily performed by using the predetermined signal for alarm or switching of the on-off valve. It can be solved.

例えば、前記所定信号は、管理室内のオペレータによって知覚可能なアラームとして利用されることが可能である。この場合、その信号を受けたオペレータが本排熱回収装置１を停止し、冷却塔５０から延びる供給管５２内を清掃する、または供給管５２内に設けられたストレーナーを清掃することで当該供給管５２内の詰まりが解消される。   For example, the predetermined signal can be used as an alarm that can be perceived by an operator in the management room. In this case, the operator who has received the signal stops the exhaust heat recovery apparatus 1 and cleans the supply pipe 52 extending from the cooling tower 50 or cleans the strainer provided in the supply pipe 52. The clogging in the tube 52 is eliminated.

また、図１に示されるように、供給管５２が二股に分岐する第一流路５２ａ及び第二流路５２ｂを有し、第一流路５２ａに第一ストレーナー５４ａ及び第一開閉弁５６ａが設けられ、かつ第二流路５２ｂに第二ストレーナー５４ｂ及び第二開閉弁５６ｂが設けられた構成である場合、前記所定信号を受けたオペレータが各開閉弁の開閉を切り換えるとともに詰まりが生じているストレーナーを洗浄するという操作を繰り返すことによって、本装置を停止することなく運転を継続することが可能となる。あるいはこの場合において、前記所定信号が各開閉弁の開閉を切り換える信号に利用されることにより、具体的には所定信号により第一開閉弁５６ａを開くとともに第二開閉弁５６ｂを閉じる、または第一開閉弁５６ａを閉じるとともに第二開閉弁５６ｂを開くようにすれば、自動で第一流路５２ａ及び第二流路５２ｂを切り換えること、すなわち自動で運転を継続することが可能となる。なお、ストレーナーとして、自動洗浄式のものが用いられ、所定信号がその洗浄機能の起動に用いられてもよい。   Further, as shown in FIG. 1, the supply pipe 52 has a first flow path 52a and a second flow path 52b that are bifurcated, and a first strainer 54a and a first on-off valve 56a are provided in the first flow path 52a. When the second flow path 52b is provided with the second strainer 54b and the second opening / closing valve 56b, the operator who has received the predetermined signal switches the opening / closing of each opening / closing valve and the strainer in which clogging occurs. By repeating the operation of washing, the operation can be continued without stopping the apparatus. Alternatively, in this case, the predetermined signal is used as a signal for switching the opening / closing of each on-off valve. Specifically, the first on-off valve 56a is opened and the second on-off valve 56b is closed by the predetermined signal, or the first If the on-off valve 56a is closed and the second on-off valve 56b is opened, the first flow path 52a and the second flow path 52b can be automatically switched, that is, the operation can be continued automatically. As the strainer, an automatic cleaning type may be used, and a predetermined signal may be used to activate the cleaning function.

また、本実施形態では、判定部４２は、基準温度差ΔＴに対して冷媒温度差Δｔが所定値以上大きくなったときに詰まり条件が成立したと判定するので、簡単にかつ安価に凝縮器１６に流入する冷却媒体の流量の減少を検知することが可能となる。すなわち、高価でかつ設置作業の煩雑な流量計を設けることによって冷媒流量を検出する場合に比べ、第一温度センサ３１及び第二温度センサ３２を用いることによって安価でかつ簡易に冷媒流量を検出することが可能となる。   In the present embodiment, the determination unit 42 determines that the clogging condition is satisfied when the refrigerant temperature difference Δt is greater than or equal to a predetermined value with respect to the reference temperature difference ΔT. It is possible to detect a decrease in the flow rate of the cooling medium flowing into the. That is, the refrigerant flow rate can be easily and inexpensively detected by using the first temperature sensor 31 and the second temperature sensor 32 as compared with the case where the refrigerant flow rate is detected by providing an expensive and complicated installation flow meter. It becomes possible.

ここで、基準温度差ΔＴは、冷媒流量ｍが基準流量Ｍであるとき（定常運転時）の第二温度センサ３２の検出値と第一温度センサ３１の検出値との差から直接求められることも可能である一方、蒸発器１０への入熱量、駆動機１４の出力及び基準流量Ｍに基づいて算出されることも可能である。すなわち、Ｑｏｕｔ＝Ｑｉｎ−Ｗの関係式が成立するので（Ｑｉｎは蒸発器１０への入熱量、Ｗは駆動機１４の出力）、基準温度差ΔＴを、蒸発器１０への入熱量Ｑｉｎ及び駆動機１４の出力Ｗに基づいて算出される凝縮器１６での放熱量Ｑｏｕｔと基準流量Ｍとに基づいて算出することも可能である。蒸発器１０への入熱量Ｑｉｎは、蒸発器１０に流入する加熱媒体の温度と蒸発器１０から流出する加熱媒体の温度との差及び予め設定されている加熱媒体の流量に基づいて算出される。蒸発器１０に流入する加熱媒体の温度は、蒸発器１０に加熱媒体を導入する加熱媒体導入管２６に設けられた第三温度センサ３３によって検出され、蒸発器１０から流出する加熱媒体の温度は、蒸発器１０から加熱媒体を排出する加熱媒体排出管２８に設けられた第四温度センサ３４によって検出される。加熱媒体の流量は、外部の熱源と加熱媒体導入管２６とを接続する接続管に設けられたポンプ（図示略）の回転数に基づいて算出される。この流量は、本排熱回収装置１の起動時に予め記憶部４４に記憶される。すなわち、第三温度センサ３３、第四温度センサ３４及び記憶部４４が「入熱量検出手段」を構成する。駆動機１４の出力Ｗは、駆動機１４の出力ラインに設けられた出力センサ３５によって検出される。 Here, the reference temperature difference ΔT can be obtained directly from the difference between the detected value of the second temperature sensor 32 and the detected value of the first temperature sensor 31 when the refrigerant flow rate m is the reference flow rate M (during steady operation). On the other hand, it is also possible to calculate based on the amount of heat input to the evaporator 10, the output of the drive unit 14, and the reference flow rate M. That is, since the relational expression Q out = Q in −W is established (Q in is the amount of heat input to the evaporator 10, W is the output of the drive unit 14), the reference temperature difference ΔT is expressed as the amount of heat input to the evaporator 10. it is also possible to calculate on the basis of the Q in and the heat radiation amount Q out and the reference flow rate M of the condenser 16 which is calculated on the basis of the output W of the drive motor 14. The amount of heat input Q in to the evaporator 10 is calculated based on the difference between the temperature of the heating medium flowing into the evaporator 10 and the temperature of the heating medium flowing out of the evaporator 10 and a preset heating medium flow rate. The The temperature of the heating medium flowing into the evaporator 10 is detected by a third temperature sensor 33 provided in the heating medium introduction pipe 26 for introducing the heating medium into the evaporator 10, and the temperature of the heating medium flowing out of the evaporator 10 is The temperature is detected by a fourth temperature sensor 34 provided in the heating medium discharge pipe 28 for discharging the heating medium from the evaporator 10. The flow rate of the heating medium is calculated based on the number of rotations of a pump (not shown) provided in a connection pipe that connects the external heat source and the heating medium introduction pipe 26. This flow rate is stored in the storage unit 44 in advance when the exhaust heat recovery apparatus 1 is started. That is, the third temperature sensor 33, the fourth temperature sensor 34, and the storage unit 44 constitute “heat input detection means”. The output W of the driving machine 14 is detected by an output sensor 35 provided on the output line of the driving machine 14.

よって、判定部４２は、入熱量検出手段の検出値、出力センサ３５の検出値及び記憶部４４に記憶されている基準流量Ｍに基づいて基準温度差ΔＴを算出し、この基準温度差ΔＴに対して冷媒温度差Δｔが所定値以上大きくなったときに詰まり条件が成立したと判定してもよい。このようにすれば、第二温度センサ３２の検出値と第一温度センサ３１の検出値との差から直接基準温度差ΔＴを求めることが困難な場合であったとしても、基準温度差ΔＴを算出することが可能となる。   Therefore, the determination unit 42 calculates the reference temperature difference ΔT based on the detection value of the heat input detection unit, the detection value of the output sensor 35, and the reference flow rate M stored in the storage unit 44, and the reference temperature difference ΔT is calculated. On the other hand, it may be determined that the clogging condition is satisfied when the refrigerant temperature difference Δt becomes larger than a predetermined value. In this way, even if it is difficult to directly obtain the reference temperature difference ΔT from the difference between the detection value of the second temperature sensor 32 and the detection value of the first temperature sensor 31, the reference temperature difference ΔT is calculated. It is possible to calculate.

なお、基準温度差ΔＴは、上記以外の手段により算出されることも可能である。   The reference temperature difference ΔT can also be calculated by means other than the above.

今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。   It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

例えば、上記実施形態では、判定部４２は、第二温度センサ３２の検出値と第一温度センサ３１の検出値との差（冷媒温度差Δｔ）が記憶部４４に記憶されている基準温度差ΔＴに対して所定値以上大きくなったときに詰まり条件が成立したと判定する例が示されたが、冷却媒体導入管２２又は冷却媒体排出管２４に流量計が設けられ、判定部４２は、流量計で検出された値（冷媒流量ｍ）が記憶部４４に記憶された基準流量Ｍに対して所定量以上減少したときに詰まり条件が成立したと判定してもよい。   For example, in the above-described embodiment, the determination unit 42 is configured such that the difference (refrigerant temperature difference Δt) between the detection value of the second temperature sensor 32 and the detection value of the first temperature sensor 31 is stored in the storage unit 44. Although an example is shown in which it is determined that the clogging condition is satisfied when ΔT is greater than a predetermined value, a flow meter is provided in the cooling medium introduction pipe 22 or the cooling medium discharge pipe 24, and the determination unit 42 It may be determined that the clogging condition is satisfied when the value (refrigerant flow rate m) detected by the flow meter decreases by a predetermined amount or more with respect to the reference flow rate M stored in the storage unit 44.

また、本排熱回収装置１に警報手段（赤色灯やブザー）が設けられ、所定信号によってその警報手段を起動させてもよい。   Further, the exhaust heat recovery apparatus 1 may be provided with alarm means (red light or buzzer), and the alarm means may be activated by a predetermined signal.

１ 排熱回収装置
１０ 蒸発器
１２ 膨張機
１４ 駆動機（発電機）
１６ 凝縮器
１８ ポンプ
２０ 循環流路
２２ 冷却媒体導入管
２４ 冷却媒体排出管
２６ 加熱媒体導入管
２８ 加熱媒体排出管
３１ 第一温度センサ
３２ 第二温度センサ
３３ 第三温度センサ（入熱量検出手段）
３４ 第四温度センサ（入熱量検出手段）
３５ 出力センサ
４０ 制御部
４２ 判定部
４４ 記憶部（入熱量検出手段） DESCRIPTION OF SYMBOLS 1 Waste heat recovery apparatus 10 Evaporator 12 Expander 14 Drive machine (generator)
DESCRIPTION OF SYMBOLS 16 Condenser 18 Pump 20 Circulation flow path 22 Cooling medium introduction pipe 24 Cooling medium discharge pipe 26 Heating medium introduction pipe 28 Heating medium discharge pipe 31 1st temperature sensor 32 2nd temperature sensor 33 3rd temperature sensor (heat input detection means)
34 Fourth temperature sensor (heat input detection means)
35 output sensor 40 control unit 42 determination unit 44 storage unit (heat input detection means)

Claims (4)

作動媒体を蒸発させる蒸発器と、
前記蒸発器から流出した作動媒体が流入する膨張機と、
前記膨張機に接続された駆動機と、
前記膨張機から流出した作動媒体を供給管を通じて供給される冷却媒体で冷却することによって凝縮させる凝縮器と、
前記供給管の詰まりを示す予め設定された詰まり条件が成立したか否かを判定する判定部と、を備える排熱回収装置。 An evaporator for evaporating the working medium;
An expander into which the working medium flowing out of the evaporator flows;
A drive connected to the expander;
A condenser for condensing the working medium flowing out of the expander by cooling with a cooling medium supplied through a supply pipe;
A waste heat recovery apparatus comprising: a determination unit that determines whether a preset clogging condition indicating clogging of the supply pipe is satisfied. 請求項１に記載の排熱回収装置において、
前記判定部は、前記詰まり条件が成立したときに所定信号を送信する排熱回収装置。 The exhaust heat recovery apparatus according to claim 1,
The determination unit is an exhaust heat recovery device that transmits a predetermined signal when the clogging condition is satisfied. 請求項１又は２に記載の排熱回収装置において、
前記凝縮器に流入する冷却媒体の温度を検出可能な第一温度センサと、
前記凝縮器から流出した冷却媒体の温度を検出可能な第二温度センサと、をさらに備え、
前記判定部は、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が予め設定された基準流量であるときの前記凝縮器から流出した冷却媒体の温度と前記凝縮器に供給される冷却媒体の温度との差である基準温度差を、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が前記基準流量であるときの前記第二温度センサの検出値と前記第一温度センサの検出値との差により算出し、この基準温度差に対し、前記第二温度センサの検出値と前記第一温度センサの検出値との差が所定値以上大きくなったときに前記詰まり条件が成立したと判定する排熱回収装置。 In the exhaust heat recovery apparatus according to claim 1 or 2,
A first temperature sensor capable of detecting the temperature of the cooling medium flowing into the condenser;
A second temperature sensor capable of detecting the temperature of the cooling medium flowing out of the condenser, and
The determination unit supplies the temperature of the cooling medium flowing out from the condenser when the flow rate of the cooling medium supplied to the condenser or out of the condenser is a preset reference flow rate and the condenser. The reference temperature difference, which is the difference from the temperature of the cooling medium to be detected, is detected by the second temperature sensor when the flow rate of the cooling medium supplied to or discharged from the condenser is the reference flow rate. And the difference between the detected value of the first temperature sensor and the difference between the detected value of the second temperature sensor and the detected value of the first temperature sensor is greater than a predetermined value with respect to the reference temperature difference. An exhaust heat recovery apparatus that determines that the clogging condition is sometimes satisfied. 請求項１又は２に記載の排熱回収装置において、
前記凝縮器に流入する冷却媒体の温度を検出可能な第一温度センサと、
前記凝縮器から流出した冷却媒体の温度を検出可能な第二温度センサと、
前記蒸発器への入熱量を検出可能な入熱量検出手段と、
前記駆動機の出力を検出可能な出力センサと、をさらに備え、
前記判定部は、前記凝縮器に供給される又は前記凝縮器から流出した冷却媒体の流量が予め設定された基準流量であるときの前記凝縮器から流出した冷却媒体の温度と前記凝縮器に供給される冷却媒体の温度との差である基準温度差を、前記入熱量検出手段の検出値、前記出力センサの検出値及び前記基準流量に基づいて算出し、この基準温度差に対し、前記第二温度センサの検出値と前記第一温度センサの検出値との差が所定値以上大きくなったときに前記詰まり条件が成立したと判定する排熱回収装置。 In the exhaust heat recovery apparatus according to claim 1 or 2,
A first temperature sensor capable of detecting the temperature of the cooling medium flowing into the condenser;
A second temperature sensor capable of detecting the temperature of the cooling medium flowing out of the condenser;
A heat input amount detecting means capable of detecting a heat input amount to the evaporator;
An output sensor capable of detecting the output of the driving machine,
The determination unit supplies the temperature of the cooling medium flowing out from the condenser when the flow rate of the cooling medium supplied to the condenser or out of the condenser is a preset reference flow rate and the condenser. A reference temperature difference, which is a difference from the temperature of the cooling medium to be generated, is calculated based on the detection value of the heat input detection means, the detection value of the output sensor, and the reference flow rate. An exhaust heat recovery apparatus that determines that the clogging condition is satisfied when a difference between a detection value of a second temperature sensor and a detection value of the first temperature sensor is greater than a predetermined value.
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