JP4229420B2 - Cooling system for heat sterilizer - Google Patents

Cooling system for heat sterilizer Download PDF

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JP4229420B2
JP4229420B2 JP2001064351A JP2001064351A JP4229420B2 JP 4229420 B2 JP4229420 B2 JP 4229420B2 JP 2001064351 A JP2001064351 A JP 2001064351A JP 2001064351 A JP2001064351 A JP 2001064351A JP 4229420 B2 JP4229420 B2 JP 4229420B2
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cooling
heat exchanger
temperature
heat
sterilization tank
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JP2002262839A (en
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寛 森
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株式会社サムソン
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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
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying

Description

【０００１】
【産業上の利用分野】
本発明は食品を加熱して殺菌を行う加熱殺菌装置における冷却システムに関するものである。
【０００２】
【従来の技術】
殺菌槽内に密封包装した被殺菌物を収容しておき、殺菌槽内に熱水を噴流して被殺菌物の加熱を行うことで、常温で長期間の保存を可能としたレトルト食品の殺菌を行う加熱殺菌装置がある。加熱殺菌装置の運転工程には、殺菌槽内へ高温の噴流水を導入して被殺菌物を加熱し殺菌する加熱殺菌工程と、加熱殺菌工程後に殺菌槽内へ低温の噴流水を導入して被殺菌物を冷却する冷却工程とがある。
【０００３】
加熱殺菌装置には熱交換器を設け、噴流水は殺菌槽と熱交換器の間で循環するようにしておき、熱交換器の２次側に噴流水を通す。加熱殺菌工程では熱交換器の１次側に蒸気を送ることで２次側の噴流水を加熱し、冷却工程では熱交換器の１次側に冷却用水を送ることで２次側の噴流水を冷却する。噴流水と冷却用水で熱交換して噴流水を冷却している冷却工程の場合、冷却用水は噴流水から熱を吸収することで温度が高くなる。冷却工程開始時点の殺菌槽内温度は１２０℃程度と高いため、熱交換器で熱の吸収を行った冷却用水は１００℃を越えることもある。
【０００４】
冷却用水を使い捨てにしたのでは冷却用水の使用量が多くなるため、冷却用水から熱の放出を行うためのクーリングタワーを設けておき、クーリングタワーと熱交換器の間で冷却用水を循環することで温度の上昇した冷却用水の熱を大気中に放出している。ただし、クーリングタワーの耐熱温度は８０℃程度であるため、冷却工程初期であって冷却用水がクーリングタワーの耐熱温度より高い場合には、クーリングタワーで冷却を行うことはできない。そのため、冷却工程初期には直接殺菌槽内へ給水を行うことで殺菌槽の温度を低下させ、温度低下後にクーリングタワーによる冷却を行う。クーリングタワーによる冷却の場合は冷却用水を再利用することができるが、殺菌槽内への給水による冷却の場合は水を使い捨てにすることになるため、使用水量が増大するという問題がある。
【０００５】
【発明が解決しようとする課題】
本発明が解決しようとする課題は、クーリングタワーに送る冷却用水温度がクーリングタワーの耐熱温度以上となることを防止することと、冷却工程時の水使用量の削減を両立することにある。
【０００６】
請求項１に記載の発明では、内部に噴流ノズルを設けた殺菌槽、一端は殺菌槽の底部に接続し他端は殺菌槽内の噴流ノズルに接続した噴流水循環経路、噴流水循環経路の途中に噴流水循環ポンプと熱交換器、さらに各部の作動を制御する運転制御装置を設けておき、蒸気によって加熱した高温の噴流水を殺菌槽内に導入することで被殺菌物の加熱殺菌を行い、冷却した低温の噴流水を殺菌槽内に導入することで殺菌槽内の冷却を行っている加熱殺菌装置であって、冷却用水から熱の放出を行うクーリングタワー、熱交換器とクーリングタワーの間を結び、熱交換器とクーリングタワーの間で冷却用水を循環させる冷却用水循環経路、冷却用水循環経路の熱交換器設置部分よりも上流側と下流側をつないだバイパス配管、バイパス配管の途中にバイパス配管の流量を制御するバイパス弁を設け、運転制御装置は、冷却工程開始直後の場合はバイパス弁を大きく開き、その後は冷却工程の進行に合わせてバイパス弁の開度を閉じる制御を行うことを特徴とするものである。
【０００８】
加熱殺菌装置における冷却工程開始直後の場合、殺菌槽内温度が高いために冷却用水の温度も高くなる。冷却用水温度がクーリングタワーの耐熱温度より高くなる場合、クーリングタワーで冷却用水を冷却することができない。しかし、噴流水循環経路にバイパス配管を設けておき、冷却工程開始時にはバイパス弁を開くようにすると、クーリングタワーにて冷却した冷却用水の一部は、熱交換器へ送らずに熱交換器からクーリングタワーへ向かう冷却用水に合流させることになり、クーリングタワーに入る冷却用水の温度を低下させることができる。
【０００９】
また、冷却工程開始時点では殺菌槽の温度が高いため、熱交換器で熱交換を行った後の冷却用水温度は高くなるが、冷却工程を行うことで殺菌槽の温度が低くなると、熱交換器で熱交換を行った後の冷却用水温度の上昇度は小さくなる。冷却工程が進行することで冷却用水温度の上昇度が小さくなると、バイパス配管を通す冷却用水量を少なくすることができ、バイパス配管の水量を少なくすると、その分熱交換器へ送る水量を多くなるため、熱交換器へ送る冷却用水量を多くすることで噴流水の冷却効率を向上することができる。
【００１０】
【発明の実施の形態】
本発明の一実施例を図面を用いて説明する。図１は本発明を実施している加熱殺菌装置のフロー図である。加熱殺菌装置は、円筒形の殺菌槽１内に被殺菌物２を収容しておき、被殺菌物２に高温水を噴流することで被殺菌物２の殺菌を行うものである。殺菌槽１の底部には噴流水循環経路１１の一端を接続し、噴流水循環経路１１の他端は殺菌槽１内に設けた噴流ノズル１３に接続しておく。噴流水循環経路１１の途中には噴流水循環ポンプ４と熱交換器３を設けておき、殺菌槽１底部から取り出した水を噴流水循環ポンプ４で加圧して殺菌槽１内の被殺菌物２へ噴流する。
【００１１】
噴流水熱交換器３は２つの流体の間で熱交換を行うものであり、熱交換器の１次側には蒸気または冷却用水、２次側には噴流水を通す。冷却用水から熱を放出するクーリングタワー８を設けておき、熱交換器３とクーリングタワー８の間で冷却用水を循環する冷却用水循環経路９を設ける。冷却用水循環経路９の途中には冷却用水の循環を行う冷却用水循環ポンプ１０と、クーリングタワー８へ向かう冷却用水の温度を検出する温度センサー７を設けておく。冷却用水循環経路９には、熱交換器３よりも上流側と熱交換器３よりも下流側をつなぐバイパス配管５を設置し、バイパス配管５の途中には流量調節の可能なバイパス弁６を設ける。
【００１２】
加熱殺菌装置の運転を制御する運転制御装置１２を設け、運転制御装置１２は加熱殺菌装置の各機器と接続しておく。加熱殺菌装置の運転は、被殺菌物２を加熱し殺菌する加熱殺菌工程と、加熱殺菌工程終了後に被殺菌物２を冷却する冷却工程がある。被殺菌物２の加熱と冷却は、どちらも噴流水循環ポンプ４を作動することで殺菌槽１内から取り出した水を熱交換器３へ送り、熱交換器３で熱交換実施後に殺菌槽１内の被殺菌物２へ噴流することで行うが、加熱時と冷却時では熱交換器の１次側を異ならせる。
【００１３】
加熱殺菌工程の場合、熱交換器３の１次側には蒸気を供給することで、噴流水循環経路１１を通る噴流水を加熱する。噴流水を高温にしておき、高温の噴流水を殺菌槽１内に噴流することで被殺菌物２の温度は上昇し、被殺菌物２を所定温度で所定時間維持することで被殺菌物２の殺菌を行う。加熱殺菌工程が終了すると蒸気の供給を停止し、被殺菌物２を冷却する冷却工程に移行する。
【００１４】
冷却工程では、冷却用水循環ポンプ１０を作動することにより、熱交換器３とクーリングタワー８の間で冷却用水を循環し、熱交換器３の１次側に冷却用水を供給する。冷却用水を熱交換器３へ供給すると、噴流水の熱が冷却用水に移動し、噴流水は温度が低下して冷却用水は温度が上昇する。冷却用水は熱交換器３とクーリングタワー８の間で循環しているため、熱交換器３で温度の上昇した冷却用水はクーリングタワー８へ向かい、クーリングタワー８で大気中に熱の放出を行って再び熱交換器３へ向かう。熱交換器３で温度の低下した噴流水は、殺菌槽１内の被殺菌物２などを冷却することで温度が上昇し、熱交換器３での熱交換を行うことを繰り返すことで殺菌槽１内を冷却することができる。
【００１５】
冷却工程の場合、熱交換器３へ送る冷却用水の量が多ければ噴流水から吸収する熱量が多くなるが、冷却工程初期の場合には冷却用水の温度が高くなり過ぎることがある。そのため、冷却工程開始時にはバイパス弁６を開いておき、冷却用水の一部はバイパス配管５を通るようにしておく。バイパス弁６を開くと、クーリングタワー８からの冷却用水は、熱交換器３より上流のバイパス配管５接続部で熱交換器３側とバイパス配管５側に分流する。熱交換器３側に向かった冷却用水は熱交換器３で熱交換を行うことで温度が高くなるが、バイパス配管側に向かった冷却用水では温度の上昇はない。熱交換器３側とバイパス配管５側に分流していた冷却用水は、熱交換器３より下流のバイパス配管５の接続部で合流する。
【００１６】
冷却工程初期の場合、殺菌槽１内の温度は１２０℃程度の高温であるため、熱交換器３で熱交換を行った冷却用水は１００℃を越える温度となることがあった。しかし高温となった冷却用水は、バイパス配管５側を通った冷却用水と混合することで温度が低くなり、クーリングタワー８の耐熱温度以上の冷却用水がクーリングタワー８に入ることを防止することができる。
【００１７】
クーリングタワー８に入る冷却用水の温度は温度センサー７で検出する。運転制御装置１２は、温度センサー７で検出している冷却用水温度がクーリングタワー８の耐熱温度（８０℃）未満となるように、バイパス弁６の開度を調節する。冷却工程初期の場合はバイパス弁６の開度を大きくしておき、冷却が進み殺菌槽１内温度の低下により温度センサー７で検出する冷却用水温度が低くなれば、バイパス弁６の開度を小さくしていく。バイパス弁６の開度を大きくした場合、バイパス配管５を通る冷却用水が多くなり、その分熱交換器３を通る冷却用水量は少なくなる。熱交換器３へ送る冷却用水量を少なくすると、熱交換器３で冷却用水が取り込む熱量が少なくなり、熱交換器３を通過した冷却用水温度は高くても、バイパス配管５からの冷却用水と混合して希釈することで冷却用水の温度は低くなる。
【００１８】
冷却工程を行うことで殺菌槽１内の温度が低くなり、温度センサー７で検出している温度が低くなると、運転制御装置１２はバイパス弁６の開度を小さくし、バイパス配管５を通る冷却用水の割合を徐々に少なくする。 殺菌槽内温度が高い場合は、熱交換器３で熱を吸収した冷却用水温度も高くなるため、バイパス配管５へ送る冷却用水を多くすることでクーリングタワー８に入る冷却用水温度を低くする必要がある。しかし、冷却工程を行うことによって殺菌槽内温度が低くなってくると、熱交換器３で熱を吸収した後の冷却用水温度も低くなるため、冷却用水温度を低くするためにバイパス配管５を通さなければならない冷却用水の必要量は少なくなる。そのため殺菌槽１の温度が低くなると、バイパス配管５を通す冷却用水量を少なくし、その分熱交換器３へ送る冷却用水量を多くすることができ、熱交換器３へ送る冷却用水量を多くすれば冷却の速度が向上する。殺菌槽１内の温度が冷却工程終了温度まで低下すると、噴流水循環ポンプ４及び冷却用水循環ポンプ１０を停止して冷却工程を終了し、殺菌槽１内から被殺菌物２を取り出す。
【００１９】
上記のようにして殺菌槽１の冷却を行うことで、クーリングタワー８の耐熱温度まで低下させるために給水を行い、その後は排水することで使い捨てにする水をなくすことができ、省エネルギーとなる。また、上記のように冷却を行うと、冷却工程初期に急激な冷却が行われることはなく、殺菌槽１を徐々に冷却することができる。急激な冷却を行った場合には温度むらが発生しやすくなり、圧力制御も不安定となって被殺菌物２が変形するなどの問題があったが、熱交換器３へ送る冷却用水量を調節することで冷却速度を調節することができるようになり、圧力制御などを安定させることもできる。
【００２０】
なお、本実施例では温度センサー７に基づいてバイパス弁６の開度を調節するようにしたが、バイパス弁６の開度調節は経過時間に基づいて行うようにしてもよく、冷却工程初期にはバイパス弁６を全開としておき、その後バイパス弁６を徐々に閉じていくようにしても良い。
【００２１】
【発明の効果】
本発明を実施することで、クーリングタワーに送られる冷却用水温度がクーリングタワーの耐熱温度以上となることを防止することと、冷却工程時の水使用量の削減を両立することができる。また、冷却速度を調節することができ、冷却工程初期に急激な冷却が行われることを防止することができるので、冷却工程初期に急激な冷却を行うことにより発生する温度むらなどを防ぐことができる。
【図面の簡単な説明】
【図１】 本発明の一実施例を行う加熱殺菌装置のフロー図
【符号の説明】
１ 殺菌槽
２ 被殺菌物
３ 熱交換器
４ 噴流水循環ポンプ
５ バイパス配管
６ バイパス弁
７ 温度センサー
８ クーリングタワー
９ 冷却用水循環経路
１０ 冷却用水循環ポンプ
１１ 噴流水循環経路
１２ 運転制御装置
１３ 噴流ノズル[0001]
[Industrial application fields]
The present invention relates to a cooling system in a heat sterilization apparatus that sterilizes food by heating.
[0002]
[Prior art]
Sterilization of retort foods that can be stored at room temperature for a long period of time by storing the products to be sterilized sealed in the sterilization tank and heating the sterilized products by jetting hot water into the sterilization tank There is a heat sterilizer that performs. In the operation process of the heat sterilizer, high temperature jet water is introduced into the sterilization tank to heat and sterilize the object to be sterilized, and low temperature jet water is introduced into the sterilization tank after the heat sterilization process. There is a cooling process for cooling the article to be sterilized.
[0003]
The heat sterilizer is provided with a heat exchanger, and the jet water is circulated between the sterilization tank and the heat exchanger, and the jet water is passed through the secondary side of the heat exchanger. In the heat sterilization process, the secondary jet water is heated by sending steam to the primary side of the heat exchanger, and in the cooling process, the secondary jet water is sent by sending cooling water to the primary side of the heat exchanger. Cool down. In the case of a cooling process in which the jet water is cooled by exchanging heat between the jet water and the cooling water, the temperature of the cooling water is increased by absorbing heat from the jet water. Since the temperature in the sterilization tank at the start of the cooling process is as high as about 120 ° C., the cooling water that has absorbed heat by the heat exchanger may exceed 100 ° C.
[0004]
If the cooling water is made disposable, the amount of cooling water used increases, so a cooling tower is provided to release heat from the cooling water, and the cooling water is circulated between the cooling tower and the heat exchanger. The heat of the cooling water is released into the atmosphere. However, since the heat resistant temperature of the cooling tower is about 80 ° C., the cooling tower cannot be cooled when the cooling water is higher than the heat resistant temperature of the cooling tower at the initial stage of the cooling process. For this reason, the temperature of the sterilization tank is lowered by supplying water directly into the sterilization tank at the beginning of the cooling process, and cooling is performed by the cooling tower after the temperature is lowered. In the case of cooling by a cooling tower, cooling water can be reused. However, in the case of cooling by water supply into the sterilization tank, water is made disposable, and there is a problem that the amount of water used increases.
[0005]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to prevent both the cooling water temperature to be sent to the cooling tower from exceeding the heat-resistant temperature of the cooling tower and to reduce the amount of water used during the cooling process.
[0006]
In the invention of claim 1, a sterilization tank provided with a jet nozzle inside, a jet water circulation path, one end connected to the bottom of the sterilization tank and the other end connected to the jet nozzle in the sterilization tank, in the middle of the jet water circulation path A jet water circulation pump, heat exchanger, and an operation control device that controls the operation of each part are provided, and high temperature jet water heated by steam is introduced into the sterilization tank to sterilize the object to be sterilized and cool it. It is a heat sterilization device that cools the sterilization tank by introducing the low temperature jet water into the sterilization tank, connecting the cooling tower that releases heat from the cooling water, the heat exchanger, and the cooling tower, Cooling water circulation path for circulating cooling water between the heat exchanger and the cooling tower, bypass piping connecting the upstream side and downstream side of the heat exchanger installation part of the cooling water circulation path, and in the middle of the bypass piping A bypass valve for controlling the flow rate of bypass pipe provided, the operation control device, wide open the bypass valve when just after the cooling step starts, thereafter performing control to close the opening of the bypass valve in accordance with the progress of the cooling step It is characterized by.
[0008]
In the case of immediately after the start of the cooling process in the heat sterilizer, the temperature of the cooling water also increases because the temperature in the sterilization tank is high. When the cooling water temperature is higher than the heat resistance temperature of the cooling tower, the cooling water cannot be cooled by the cooling tower. However, if a bypass pipe is provided in the jet water circulation path and the bypass valve is opened at the start of the cooling process, a part of the cooling water cooled by the cooling tower is not sent to the heat exchanger but from the heat exchanger to the cooling tower. Therefore, the temperature of the cooling water entering the cooling tower can be lowered.
[0009]
Also, since the temperature of the sterilization tank is high at the start of the cooling process, the temperature of the cooling water after performing heat exchange with the heat exchanger increases, but if the temperature of the sterilization tank decreases by performing the cooling process, heat exchange The degree of increase in the temperature of the cooling water after heat exchange in the vessel is small. If the degree of increase in the cooling water temperature decreases as the cooling process progresses, the amount of cooling water passing through the bypass pipe can be reduced, and if the amount of water in the bypass pipe is reduced, the amount of water sent to the heat exchanger increases accordingly. Therefore, the cooling efficiency of jet water can be improved by increasing the amount of cooling water sent to the heat exchanger.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow diagram of a heat sterilizer embodying the present invention. The heat sterilization apparatus accommodates the article to be sterilized 2 in a cylindrical sterilization tank 1 and sterilizes the article to be sterilized 2 by spraying high temperature water onto the article to be sterilized 2. One end of the jet water circulation path 11 is connected to the bottom of the sterilization tank 1, and the other end of the jet water circulation path 11 is connected to a jet nozzle 13 provided in the sterilization tank 1. A jet water circulation pump 4 and a heat exchanger 3 are provided in the middle of the jet water circulation path 11, and water taken out from the bottom of the sterilization tank 1 is pressurized by the jet water circulation pump 4 and jetted to the article 2 to be sterilized in the sterilization tank 1. To do.
[0011]
The jet water heat exchanger 3 exchanges heat between two fluids. Steam or cooling water is passed through the primary side of the heat exchanger, and jet water is passed through the secondary side. A cooling tower 8 for releasing heat from the cooling water is provided, and a cooling water circulation path 9 for circulating the cooling water between the heat exchanger 3 and the cooling tower 8 is provided. A cooling water circulation pump 10 that circulates the cooling water and a temperature sensor 7 that detects the temperature of the cooling water toward the cooling tower 8 are provided in the middle of the cooling water circulation path 9. A bypass pipe 5 that connects the upstream side of the heat exchanger 3 and the downstream side of the heat exchanger 3 is installed in the cooling water circulation path 9, and a bypass valve 6 that can adjust the flow rate is provided in the middle of the bypass pipe 5. Provide.
[0012]
An operation control device 12 for controlling the operation of the heat sterilizer is provided, and the operation control device 12 is connected to each device of the heat sterilizer. The operation of the heat sterilizer includes a heat sterilization process for heating and sterilizing the article to be sterilized 2 and a cooling process for cooling the article to be sterilized after the heat sterilization process. Both heating and cooling of the object to be sterilized 2 are performed by operating the jet water circulation pump 4 to send water taken out from the sterilization tank 1 to the heat exchanger 3, and after exchanging heat in the heat exchanger 3, However, the primary side of the heat exchanger is made different between heating and cooling.
[0013]
In the case of the heat sterilization process, steam is supplied to the primary side of the heat exchanger 3 to heat the jet water passing through the jet water circulation path 11. The temperature of the article to be sterilized rises by keeping the jet water at a high temperature and spraying the hot jet water into the sterilization tank 1, and the article to be sterilized 2 is maintained at the predetermined temperature for a predetermined time. Sterilize. When the heat sterilization process is completed, the supply of steam is stopped, and the process proceeds to a cooling process for cooling the article 2 to be sterilized.
[0014]
In the cooling process, by operating the cooling water circulation pump 10, the cooling water is circulated between the heat exchanger 3 and the cooling tower 8, and the cooling water is supplied to the primary side of the heat exchanger 3. When the cooling water is supplied to the heat exchanger 3, the heat of the jet water moves to the cooling water, the temperature of the jet water decreases, and the temperature of the cooling water increases. Since the cooling water circulates between the heat exchanger 3 and the cooling tower 8, the cooling water whose temperature has risen in the heat exchanger 3 goes to the cooling tower 8, releases heat into the atmosphere at the cooling tower 8, and then heats again. Go to exchanger 3. The jet water whose temperature has decreased in the heat exchanger 3 rises in temperature by cooling the sterilized object 2 in the sterilization tank 1 and repeats heat exchange in the heat exchanger 3 to repeat the sterilization tank. The inside of 1 can be cooled.
[0015]
In the cooling process, if the amount of cooling water sent to the heat exchanger 3 is large, the amount of heat absorbed from the jet water increases, but the temperature of the cooling water may become too high in the initial stage of the cooling process. Therefore, the bypass valve 6 is opened at the start of the cooling process, and a part of the cooling water is allowed to pass through the bypass pipe 5. When the bypass valve 6 is opened, the cooling water from the cooling tower 8 is divided into the heat exchanger 3 side and the bypass pipe 5 side at the connection portion of the bypass pipe 5 upstream from the heat exchanger 3. The temperature of the cooling water directed toward the heat exchanger 3 is increased by performing heat exchange with the heat exchanger 3, but the temperature of the cooling water directed toward the bypass pipe is not increased. The cooling water that has been diverted to the heat exchanger 3 side and the bypass pipe 5 side joins at the connection portion of the bypass pipe 5 downstream from the heat exchanger 3.
[0016]
In the early stage of the cooling process, since the temperature in the sterilization tank 1 is as high as about 120 ° C., the cooling water subjected to heat exchange in the heat exchanger 3 sometimes has a temperature exceeding 100 ° C. However, the temperature of the cooling water that has reached a high temperature is lowered by mixing with the cooling water that has passed through the bypass pipe 5, so that it is possible to prevent cooling water having a temperature higher than the heat resistance temperature of the cooling tower 8 from entering the cooling tower 8.
[0017]
The temperature of the cooling water entering the cooling tower 8 is detected by the temperature sensor 7. The operation control device 12 adjusts the opening degree of the bypass valve 6 so that the cooling water temperature detected by the temperature sensor 7 is lower than the heat-resistant temperature (80 ° C.) of the cooling tower 8. In the initial stage of the cooling process, the opening degree of the bypass valve 6 is increased, and when the cooling progresses and the temperature of the cooling water detected by the temperature sensor 7 decreases due to a decrease in the temperature in the sterilization tank 1, the opening degree of the bypass valve 6 is increased. Make it smaller. When the opening degree of the bypass valve 6 is increased, the amount of cooling water passing through the bypass pipe 5 increases, and the amount of cooling water passing through the heat exchanger 3 decreases accordingly. If the amount of cooling water sent to the heat exchanger 3 is reduced, the amount of heat taken in by the cooling water in the heat exchanger 3 is reduced, and even if the cooling water temperature passing through the heat exchanger 3 is high, the cooling water from the bypass pipe 5 The temperature of the cooling water is lowered by mixing and diluting.
[0018]
When the temperature in the sterilization tank 1 is lowered by performing the cooling process and the temperature detected by the temperature sensor 7 is lowered, the operation control device 12 reduces the opening of the bypass valve 6 and cools through the bypass pipe 5. Gradually reduce the proportion of water used. When the temperature in the sterilization tank is high, the temperature of the cooling water that has absorbed the heat in the heat exchanger 3 also increases. Therefore, it is necessary to reduce the temperature of the cooling water entering the cooling tower 8 by increasing the amount of cooling water sent to the bypass pipe 5. is there. However, if the temperature in the sterilization tank is lowered by performing the cooling process, the cooling water temperature after absorbing heat by the heat exchanger 3 is also lowered. Therefore, in order to lower the cooling water temperature, the bypass pipe 5 is provided. The required amount of cooling water that must be passed is reduced. Therefore, when the temperature of the sterilization tank 1 is lowered, the amount of cooling water passing through the bypass pipe 5 can be reduced, the amount of cooling water sent to the heat exchanger 3 can be increased correspondingly, and the amount of cooling water sent to the heat exchanger 3 can be increased. Increasing the number will increase the cooling rate. When the temperature in the sterilization tank 1 is lowered to the cooling process end temperature, the jet water circulation pump 4 and the cooling water circulation pump 10 are stopped to end the cooling process, and the object to be sterilized 2 is taken out from the sterilization tank 1.
[0019]
By cooling the sterilization tank 1 as described above, water can be supplied in order to reduce the temperature to the heat-resistant temperature of the cooling tower 8, and then water can be eliminated by draining, thereby saving energy. Moreover, if it cools as mentioned above, rapid cooling will not be performed at the beginning of a cooling process, but the sterilization tank 1 can be cooled gradually. When rapid cooling is performed, uneven temperature tends to occur, pressure control becomes unstable, and there is a problem that the sterilized material 2 is deformed. However, the amount of cooling water sent to the heat exchanger 3 is reduced. By adjusting, the cooling rate can be adjusted, and pressure control and the like can be stabilized.
[0020]
In this embodiment, the opening degree of the bypass valve 6 is adjusted based on the temperature sensor 7. However, the opening degree adjustment of the bypass valve 6 may be performed based on the elapsed time, and at the initial stage of the cooling process. The bypass valve 6 may be fully opened, and then the bypass valve 6 may be gradually closed.
[0021]
【The invention's effect】
By practicing the present invention, it is possible to prevent both the cooling water temperature sent to the cooling tower from being equal to or higher than the heat-resistant temperature of the cooling tower and the reduction of water usage during the cooling process. In addition, since the cooling rate can be adjusted and rapid cooling can be prevented in the early stage of the cooling process, it is possible to prevent uneven temperature caused by rapid cooling in the early stage of the cooling process. it can.
[Brief description of the drawings]
FIG. 1 is a flowchart of a heat sterilization apparatus according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Sterilization tank 2 Object to be sterilized 3 Heat exchanger 4 Jet water circulation pump 5 Bypass piping 6 Bypass valve 7 Temperature sensor 8 Cooling tower 9 Cooling water circulation path 10 Cooling water circulation pump 11 Jet water circulation path 12 Operation control device 13 Jet nozzle

Claims (1)

内部に噴流ノズルを設けた殺菌槽、一端は殺菌槽の底部に接続し他端は殺菌槽内の噴流ノズルに接続した噴流水循環経路、噴流水循環経路の途中に噴流水循環ポンプと熱交換器、さらに各部の作動を制御する運転制御装置を設けておき、蒸気によって加熱した高温の噴流水を殺菌槽内に導入することで被殺菌物の加熱殺菌を行い、冷却した低温の噴流水を殺菌槽内に導入することで殺菌槽内の冷却を行っている加熱殺菌装置の冷却システムであって、冷却用水から熱の放出を行うクーリングタワー、熱交換器とクーリングタワーの間を結び、熱交換器とクーリングタワーの間で冷却用水を循環させる冷却用水循環経路、冷却用水循環経路の熱交換器設置部分よりも上流側と下流側をつないだバイパス配管、バイパス配管の途中にバイパス配管の流量を制御するバイパス弁を設け、運転制御装置は、冷却工程開始直後の場合はバイパス弁を大きく開き、その後は冷却工程の進行に合わせてバイパス弁の開度を閉じる制御を行うことを特徴とする加熱殺菌装置の冷却システム。A sterilization tank provided with a jet nozzle inside, a jet water circulation path with one end connected to the bottom of the sterilization tank and the other end connected to the jet nozzle in the sterilization tank, a jet water circulation pump and a heat exchanger in the middle of the jet water circulation path, An operation control device for controlling the operation of each part is provided, and high temperature jet water heated by steam is introduced into the sterilization tank to sterilize the object to be sterilized, and the cooled low temperature jet water is stored in the sterilization tank. This is a cooling system for a heat sterilization apparatus that cools the inside of the sterilization tank by connecting to the cooling tower that releases heat from the cooling water, connecting the heat exchanger and the cooling tower, and connecting the heat exchanger and the cooling tower. Cooling water circulation path that circulates cooling water between, bypass piping connecting the upstream side and downstream side of the heat exchanger installation part of the cooling water circulation path, bypass piping in the middle of the bypass piping A bypass valve for controlling the flow rate is provided, and the operation control device opens the bypass valve greatly immediately after the start of the cooling process, and then performs control to close the opening of the bypass valve as the cooling process proceeds. Cooling system for heating sterilizer.
JP2001064351A 2001-03-08 2001-03-08 Cooling system for heat sterilizer Expired - Fee Related JP4229420B2 (en)

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JP2019205403A (en) * 2018-05-30 2019-12-05 三浦工業株式会社 Sterilizer
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