JP5826617B2 - Heat sterilizer - Google Patents

Heat sterilizer Download PDF

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JP5826617B2
JP5826617B2 JP2011259069A JP2011259069A JP5826617B2 JP 5826617 B2 JP5826617 B2 JP 5826617B2 JP 2011259069 A JP2011259069 A JP 2011259069A JP 2011259069 A JP2011259069 A JP 2011259069A JP 5826617 B2 JP5826617 B2 JP 5826617B2
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西山 将人
将人 西山
森 寛
寛 森
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株式会社サムソン
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Description

本発明は、殺菌槽内に収容した被殺菌物(包装食品)を加熱することで殺菌を行い、加熱殺菌後には循環噴流水を冷却しながら殺菌槽内の被殺菌物へ噴射することで被殺菌物の冷却を行う加熱殺菌装置に関するものである。   The present invention performs sterilization by heating an object to be sterilized (packaged food) contained in a sterilization tank, and after heat sterilization, the circulating jet water is cooled and sprayed onto the object to be sterilized while being cooled. The present invention relates to a heat sterilization apparatus for cooling a sterilized product.

特許第4229420号公報に記載があるように、殺菌槽内に密封包装した被殺菌物を収容しておき、殺菌槽内の被殺菌物に向けて加熱した循環噴流水を噴射するなどして被殺菌物を加熱し、殺菌温度で所定時間維持することによって殺菌を行う加熱殺菌装置が広く普及している。この加熱殺菌装置では、一方の端部を殺菌槽の底部に接続し、他方の端部は殺菌槽内に設けた噴射用ノズルに接続している循環配管を設置している。殺菌槽内の被殺菌物に噴射した循環噴流水は、殺菌槽底部から循環配管へ取り出し、再び噴射ノズルから被殺菌物へ向けて噴射させる循環を行うようにしている。   As described in Japanese Patent No. 4229420, an object to be sterilized sealed in a sterilization tank is accommodated, and heated circulating jet water is sprayed toward the object to be sterilized in the sterilization tank. Heat sterilizers that sterilize by heating a sterilized product and maintaining it at a sterilization temperature for a predetermined time are widely used. In this heat sterilization apparatus, one end is connected to the bottom of the sterilization tank, and the other end is provided with a circulation pipe connected to an injection nozzle provided in the sterilization tank. The circulating jet water sprayed on the article to be sterilized in the sterilization tank is taken out from the bottom of the sterilization tank to the circulation pipe and is circulated again to be sprayed from the spray nozzle toward the article to be sterilized.

加熱殺菌装置の運転工程には、加熱した循環噴流水を殺菌槽内の被殺菌物へ噴射して被殺菌物を加熱する加熱工程と、加熱工程後に循環噴流水を冷却しながら殺菌槽内の被殺菌物へ噴射して被殺菌物を冷却する冷却工程とがある。循環噴流水を冷却する場合、循環噴流水に常温水を混入することで温度を低下させても良いが、噴流水循環経路に熱交換器を設置しておき、熱交換によって循環噴流水温度を低下させるようにすると、冷却に要する水を削減することができる。この場合、熱交換器の他方側にはクーリングタワーを設置した冷却用水循環経路を設置し、熱交換器とクーリングタワーの間でも冷却用水を循環させるようにしておき、熱交換器で奪った熱はクーリングタワーで外気に放出するなどによって循環噴流水を冷却することができる。   The operation process of the heat sterilizer includes a heating process in which heated circulating jet water is sprayed onto the article to be sterilized in the sterilizing tank to heat the article to be sterilized, and the circulating jet water in the sterilizing tank is cooled after the heating process. There is a cooling process in which the object to be sterilized is sprayed to cool the object to be sterilized. When cooling the circulating jet water, the temperature may be lowered by mixing normal temperature water in the circulating jet water, but a heat exchanger is installed in the jet water circulation path to lower the circulating jet water temperature by heat exchange. By doing so, water required for cooling can be reduced. In this case, a cooling water circulation path with a cooling tower is installed on the other side of the heat exchanger so that the cooling water is circulated between the heat exchanger and the cooling tower. The circulating jet water can be cooled by discharging it to the outside air.

加熱工程時でも冷却工程時でも、急激な温度変化を行うと殺菌槽内圧力と包装内圧力の差が大きくなり、膨張の差による包装の破損などが発生する。また、温度の変化を緩やかにすることで必要以上に時間を掛けても、処理時間が長くなって作業効率が悪くなるため、温度と圧力は適正になるように制御する必要がある。通常は運転開始からの経過時間とその時点での目標温度を設定しておき、検出した実際の温度が目標温度に近づくように温度の調節を行いながら加熱及び冷却を行っている。   If a sudden temperature change is performed during the heating process or the cooling process, the difference between the pressure in the sterilization tank and the pressure in the package becomes large, and the package is damaged due to the difference in expansion. Further, even if it takes more time than necessary by making the change in temperature moderate, the processing time becomes longer and the working efficiency becomes worse. Therefore, it is necessary to control the temperature and pressure to be appropriate. Usually, the elapsed time from the start of operation and the target temperature at that time are set, and heating and cooling are performed while adjusting the temperature so that the detected actual temperature approaches the target temperature.

循環噴流水を加熱する際の温度調節は、加熱用の蒸気供給量を増減することで行え、供給する蒸気の温度が一定であれば温度制御は簡単に行える。冷却時の循環噴流水の温度調節は、冷却用水循環経路に熱交換器をバイパスするためのバイパス配管を設置して、バイパス配管での流量を調節することで行っている。バイパス配管での流量を変更すると、クーリングタワーから熱交換器へ送る冷却用水の流量が変化し、熱交換器で冷却用水が奪う熱量が変化することによって循環噴流水の温度を制御することができる。バイパス配管に多く流し、熱交換器へ流れる冷却用水の量が少なくなるようにすると、熱交換器で循環噴流水から吸収する熱量が小さくなるため、循環噴流水の温度低下量は少なくなる。逆にバイパス配管の流量を少なくすれば熱交換器部分を流れる冷却用水量が増加するために循環噴流水から吸収する熱量が大きくなって、循環噴流水の温度低下量は大きくなる。   Temperature control when heating the circulating jet water can be performed by increasing or decreasing the amount of steam supplied for heating. If the temperature of the supplied steam is constant, temperature control can be easily performed. The temperature of the circulating jet water at the time of cooling is adjusted by installing a bypass pipe for bypassing the heat exchanger in the cooling water circulation path and adjusting the flow rate in the bypass pipe. When the flow rate in the bypass pipe is changed, the flow rate of the cooling water sent from the cooling tower to the heat exchanger changes, and the temperature of the circulating jet water can be controlled by changing the amount of heat taken by the cooling water in the heat exchanger. If the amount of cooling water flowing through the bypass pipe and flowing into the heat exchanger is reduced, the amount of heat absorbed from the circulating jet water by the heat exchanger is reduced, and the temperature drop of the circulating jet water is reduced. Conversely, if the flow rate of the bypass pipe is reduced, the amount of cooling water flowing through the heat exchanger portion increases, so the amount of heat absorbed from the circulating jet water increases, and the temperature drop amount of the circulating jet water increases.

循環噴流水の温度制御は、経過時間に基づいて設定している目標温度と、実際に計測して求めた実際温度の差を算出し、差がなくなるように冷却用水量制御弁の開度をPID制御で調節する。冷却用水量制御弁の開度を目標温度との差に基づいて調節することで、目標温度線に沿った冷却を行うことができるはずであるが、実際には高温時に急激な温度低下が発生したり、低温時には目標温度に近づくまでに時間がかかるなど、想定通りに温度が変化していかないことがあった。   Circulating jet water temperature control calculates the difference between the target temperature set based on the elapsed time and the actual temperature obtained by actual measurement, and adjusts the opening of the cooling water flow control valve so that there is no difference. Adjust with PID control. By adjusting the opening of the cooling water volume control valve based on the difference from the target temperature, it should be possible to perform cooling along the target temperature line, but in reality, a sudden temperature drop occurs at high temperatures. However, the temperature may not change as expected, for example, it takes time to approach the target temperature at low temperatures.

特許第4229420号公報Japanese Patent No. 4229420

本発明が解決しようとする課題は、冷却時に循環噴流水の温度を低下していくことで被殺菌物を冷却する仕組みにしている加熱殺菌装置において、急激な温度の低下や温度調節が遅れることを防止することのできる加熱殺菌装置を提供することにある。   The problem to be solved by the present invention is that, in the heat sterilization apparatus that cools the sterilized product by lowering the temperature of the circulating jet water during cooling, rapid temperature reduction and temperature adjustment are delayed. It is in providing the heat sterilizer which can prevent.

請求項1に記載の発明は、被殺菌物を収容する殺菌槽、途中に熱交換器を持ち殺菌槽との間で循環噴流水を循環させる噴流水循環経路、循環噴流水の温度を検出する温度検出装置、熱交換器で循環噴流水を冷却するために送る冷却用水量を制御する冷却用水量制御弁を持ち、殺菌槽内の被殺菌物を加熱することで殺菌を行い、その後に被殺菌物の冷却を行うようにしている加熱殺菌装置であって、被殺菌物の冷却時には、循環噴流水の実際温度と目標温度の差が小さくなるように冷却用水量制御弁の開度を制御し、熱交換器へ送る冷却用水量を調節することで循環噴流水温度を調節するようにしている加熱殺菌装置において、冷却工程初期の循環噴流水高温時には、循環噴流水の実際温度と目標温度の差分に対する冷却用水量制御弁の操作量は比較的小さな量とし、冷却工程終期の循環噴流水低温時には、循環噴流水の実際温度と目標温度の差分に対する冷却用水量制御弁の操作量は比較的大きな量とする。   The invention described in claim 1 is a sterilization tank for storing an object to be sterilized, a jet water circulation path for circulating circulating jet water between the sterilization tank having a heat exchanger in the middle, and a temperature for detecting the temperature of the circulating jet water. It has a cooling water volume control valve that controls the amount of cooling water sent to cool the circulating jet water with a detector and heat exchanger, and sterilizes by heating the object to be sterilized in the sterilization tank. This is a heat sterilizer that cools the object, and when the object to be sterilized is cooled, the opening of the cooling water amount control valve is controlled so that the difference between the actual temperature of the circulating jet water and the target temperature is small. In the heat sterilizer that adjusts the temperature of the circulating jet water by adjusting the amount of cooling water sent to the heat exchanger, the actual temperature of the circulating jet water and the target temperature are Operating amount of cooling water flow control valve for difference Relatively small amount, when the circulating water jet temperature cooling step telophase, the operation amount of the cooling water amount control valve for the difference between the actual temperature and the target temperature of the circulating water jets is relatively large amounts.

請求項2に記載の発明は、前記の加熱殺菌装置において、熱交換器の冷却用水側には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を設置し、冷却用水循環経路には熱交換器をバイパスするバイパス配管を設置しておき、バイパス配管での流量を制御することで熱交換器へ送る冷却用水量を調節するようにしていることを特徴とする。   In the heat sterilization apparatus according to claim 2, a cooling water circulation path for circulating cooling water between the heat exchanger and the cooling tower is installed on the cooling water side of the heat exchanger, and the cooling water circulation path Is characterized in that a bypass pipe for bypassing the heat exchanger is installed and the amount of cooling water sent to the heat exchanger is adjusted by controlling the flow rate in the bypass pipe.

冷却工程初期の循環噴流水温度が高い時期の場合には、循環噴流水と冷却用水との間での温度差が大きいため、熱交換器へ送る冷却用水量を変化させると循環噴流水の温度は大きく変化する。逆に、冷却工程が進んでからの低温時には、循環噴流水と冷却用水との間での温度差が小さいため、熱交換器へ送る冷却用水量を同じだけ変化させても循環噴流水の温度変化量は小さい。高温時と低温時で目標との差に対する冷却用水量制御弁開度の変更量を異ならせ、高温時には冷却用水供給量の変更量を小さくし、低温時には冷却用水供給量の変更量を大きくすることで、冷却時に目標に沿った冷却を行うことができる。   When the temperature of the circulating jet water at the initial stage of the cooling process is high, the temperature difference between the circulating jet water and the cooling water is large. Therefore, if the amount of cooling water sent to the heat exchanger is changed, the temperature of the circulating jet water is changed. Changes greatly. Conversely, at low temperatures after the cooling process has progressed, the temperature difference between the circulating jet water and the cooling water is small, so even if the amount of cooling water sent to the heat exchanger is changed by the same amount, the temperature of the circulating jet water The amount of change is small. Change the amount of change in the cooling water volume control valve opening for the difference between the target at high temperature and low temperature, decrease the amount of cooling water supply at high temperatures, and increase the amount of cooling water supply at low temperatures Thus, it is possible to perform cooling according to the target at the time of cooling.

本発明を実施することで、冷却工程初期の高温時に循環噴流水温度が急激に低下することや、冷却工程終期の低温時に循環噴流水の温度変化が遅れが発生するということを防止できる。   By carrying out the present invention, it is possible to prevent the circulating jet water temperature from rapidly decreasing at a high temperature in the initial stage of the cooling process, and the temperature change of the circulating jet water from being delayed at a low temperature at the end of the cooling process.

本発明を実施している加熱殺菌装置のフロー図Flow diagram of a heat sterilizer embodying the present invention

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に加熱した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内に設けた噴射ノズル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へ噴射するようにしておく。   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 heated 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 an injection 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 injected into the sterilized object 2 in the sterilization tank 1. Make sure you do.

熱交換器3は、加熱殺菌装置の冷却工程時に循環噴流水から熱を奪うものであり、2つの流体の間で熱交換を行うことで循環噴流水の冷却を行う。熱交換器の一方の側は殺菌槽1との間で循環する循環噴流水が通り、他方の側は循環噴流水から奪った熱を放出するための冷却用水が通る。冷却用水側では冷却用水の冷却を行うクーリングタワー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ための冷却用水循環ポンプ10と、熱交換器3の前後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冷却用水量制御弁6を設ける。   The heat exchanger 3 takes heat from the circulating jet water during the cooling process of the heat sterilizer, and cools the circulating jet water by exchanging heat between the two fluids. On one side of the heat exchanger, circulating jet water circulating between the sterilization tank 1 passes, and on the other side cooling water for releasing heat taken from the circulating jet water passes. A cooling tower 8 for cooling the cooling water is provided on the cooling water side, 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 for circulating the cooling water and a bypass pipe 5 connecting the front and rear of the heat exchanger 3 are installed in the middle of the cooling water circulation path 9. A possible cooling water amount control valve 6 is provided.

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を加熱して殺菌する加熱工程と、加熱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を作動することで循環噴流水を殺菌槽1内から噴流水循環経路へ取り出し、噴流水循環経路と噴射ノズル13を通して被殺菌物2へ噴射することで行う。   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 heating process for heating and sterilizing the article to be sterilized 2 and a cooling process for cooling the article to be sterilized 2 after the heating process is completed. Both heating and cooling of the object to be sterilized 2 are performed by operating the jet water circulation pump 4 to take out the circulating jet water from the sterilization tank 1 to the jet water circulation path and inject it into the article to be sterilized 2 through the jet water circulation path and the injection nozzle 13. To do.

加熱工程では、殺菌槽内の底部に蒸気を供給して循環噴流水の加熱を行う。殺菌槽内の底部で加熱した循環噴流水は、噴流水循環ポンプ4を作動することで噴流水循環経路11を通り、噴射ノズル13から被殺菌物2に向けて噴射することで被殺菌物2を加熱する。被殺菌物2を所定の殺菌温度まで加熱し、殺菌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。   In the heating step, steam is supplied to the bottom of the sterilization tank to heat the circulating jet water. The circulating jet water heated at the bottom in the sterilization tank passes through the jet water circulation path 11 by operating the jet water circulation pump 4 and is jetted from the spray nozzle 13 toward the article to be sterilized 2 to heat the article to be sterilized 2. To do. The object to be sterilized 2 is sterilized by heating the object to be sterilized 2 to a predetermined sterilization temperature and maintaining the sterilization temperature for a predetermined time.

加熱工程で被殺菌物の加熱を行うと、被殺菌物は密封しているために加熱によって内部の圧力が高まる。このとき、殺菌槽内圧力よりも被殺菌物内の圧力の方が高くなり、その差が大きくなると被殺菌物が破損することがある。そのため運転制御装置12は、殺菌槽1への蒸気供給量を調節し、殺菌槽内の圧力と被殺菌物の温度を調節しながら加熱する。
加熱時には運転開始からの経過時間と、その時点での殺菌槽内温度及び圧力を設定しておき、設定値になるように蒸気供給量を調節する。
When the object to be sterilized is heated in the heating process, the object to be sterilized is hermetically sealed, so that the internal pressure is increased by heating. At this time, the pressure in the object to be sterilized becomes higher than the pressure in the sterilization tank, and if the difference becomes large, the object to be sterilized may be damaged. Therefore, the operation control device 12 adjusts the amount of steam supplied to the sterilization tank 1 and heats it while adjusting the pressure in the sterilization tank and the temperature of the object to be sterilized.
At the time of heating, the elapsed time from the start of operation and the temperature and pressure in the sterilization tank at that time are set, and the steam supply amount is adjusted so as to be a set value.

加熱工程が終了すると、被殺菌物2を冷却する冷却工程に移行する。冷却工程でも、経過時間とその時点での殺菌槽内温度及び圧力を設定しておき、設定値になるように冷却速度の調節を行う。運転制御装置12では、冷却時には冷却用水循環ポンプ10を作動し、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。この状態で噴流水循環経路11の循環噴流水を熱交換器3へ送ると、循環噴流水と冷却用水の間で熱交換が起こり、循環噴流水の熱が冷却用水に移動する。熱交換によって循環噴流水は温度が低下しているため、噴流ノズル13から被殺菌物2へ循環噴流水の噴射を行うと、被殺菌物2の温度は低下する。   When the heating process ends, the process proceeds to a cooling process for cooling the article 2 to be sterilized. Also in the cooling step, the elapsed time and the temperature and pressure in the sterilization tank at that time are set, and the cooling rate is adjusted so that the set value is obtained. In the operation control device 12, the cooling water circulation pump 10 is operated during cooling, and the cooling water is circulated between the heat exchanger 3 and the cooling tower 8. If the circulating jet water of the jet water circulation path 11 is sent to the heat exchanger 3 in this state, heat exchange occurs between the circulating jet water and the cooling water, and the heat of the circulating jet water moves to the cooling water. Since the temperature of the circulating jet water is reduced by heat exchange, when the circulating jet water is injected from the jet nozzle 13 to the article to be sterilized 2, the temperature of the article to be sterilized 2 is lowered.

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で循環噴流水から奪った熱はクーリングタワー8に移動し、クーリングタワー8を通じて大気中への熱放出が行われる。クーリングタワーで温度を低下させた冷却用水は、再び熱交換器3へ向かう。熱交換器3で温度の低下した循環噴流水は、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ているため、熱交換器3では温度が上昇した循環噴流水と温度が低下した冷却用水の間で再び熱交換し、熱が循環噴流水から冷却用水へ移動するということを繰り返し、被殺菌物2を冷却していく。   Since the cooling water circulates between the heat exchanger 3 and the cooling tower 8, the heat taken from the circulating jet water by the heat exchanger 3 moves to the cooling tower 8, and heat is released into the atmosphere through the cooling tower 8. . The cooling water whose temperature has been reduced by the cooling tower goes to the heat exchanger 3 again. Since the circulating jet water whose temperature has decreased in the heat exchanger 3 has increased in temperature by cooling the article 2 to be sterilized in the sterilization tank 1, the circulating jet water whose temperature has increased in the heat exchanger 3 and Heat exchange is performed again between the cooling water whose temperature has decreased, and heat is transferred from the circulating jet water to the cooling water, thereby cooling the article 2 to be sterilized.

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循環噴流水から吸収する熱量が多くなり、冷却用水の量が少なければ循環噴流水から吸収する熱量も少なくなる。熱交換器3へ送る冷却用水の量は、バイパス配管5での冷却用水量制御弁6の開度を制御することによって調節することができる。冷却用水量制御弁6の開度を大きくすると、バイパス配管5を通る冷却用水量が多くなり、その分だけ熱交換器3を通る冷却用水量が少なくなる。そして熱交換器を流れる冷却用水量が減少すると、循環噴流水の温度低下は少なくなる。逆に冷却用水量制御弁6の開度を小さくしてバイパス配管5での流量を少なくすると、熱交換器を流れる冷却用水量が増加するために循環噴流水の温度低下は多くなる。   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 circulating jet water increases, and if the amount of cooling water is small, the amount of heat absorbed from the circulating jet water decreases. The amount of cooling water sent to the heat exchanger 3 can be adjusted by controlling the opening degree of the cooling water amount control valve 6 in the bypass pipe 5. When the opening degree of the cooling water amount control 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. And if the amount of water for cooling which flows through a heat exchanger decreases, the temperature fall of circulating jet water will decrease. Conversely, if the opening degree of the cooling water amount control valve 6 is reduced and the flow rate in the bypass pipe 5 is reduced, the amount of cooling water flowing through the heat exchanger increases, so the temperature drop of the circulating jet water increases.

運転制御装置12では、噴流水循環経路11に設けた温度検出装置7によって循環噴流水の実際温度を検出しておき、経過時間に対応させて設定している目標温度になるように冷却用水量制御弁6の開度を調節して冷却水温度を制御する。循環噴流水を目標温度に制御する場合、温度検出装置7で検出している実際温度と設定しておいたその時点における目標温度の差を算出し、差分に基づいてPID制御を行う。PID制御では、目標温度と実際温度の差が大きいほど冷却用水量制御弁6での開度変更量を大きくし、差が小さくなってくると冷却用水量制御弁6での開度変更量を小さくするが、冷却工程初期の高温時と冷却工程終期の低温時では、実際温度と目標温度の差分が同じであっても冷却用水量制御弁6の開度変更量は異なるように設定しておく。   In the operation control device 12, the actual temperature of the circulating jet water is detected by the temperature detection device 7 provided in the jet water circulation path 11, and the cooling water amount control is performed so that the target temperature is set corresponding to the elapsed time. The opening of the valve 6 is adjusted to control the cooling water temperature. When controlling the circulating jet water to the target temperature, the difference between the actual temperature detected by the temperature detection device 7 and the target temperature set at that time is calculated, and PID control is performed based on the difference. In the PID control, as the difference between the target temperature and the actual temperature is larger, the opening degree change amount in the cooling water amount control valve 6 is increased, and when the difference is smaller, the opening degree change amount in the cooling water amount control valve 6 is changed. The amount of change in the opening degree of the cooling water amount control valve 6 is set to be different between the actual temperature and the target temperature even when the temperature is high at the beginning of the cooling process and at the low temperature at the end of the cooling process. deep.

冷却工程初期であって循環噴流水の温度が高い時期の場合、循環噴流水の温度と冷却用水の温度には大きな差がある。そのため、熱交換器3へ送る冷却用水の流量を少し変えただけでも、熱交換器3で変化する循環噴流水の温度は比較的大きなものになる。逆に冷却工程終期であって循環噴流水の温度が低い時期の場合、循環噴流水の温度と冷却用水の温度差は小さくなる。そのため、熱交換器3へ送る冷却用水の流量を同じだけ変えても、熱交換器3で変化する循環噴流水の温度は比較的小さなものになる。そのため、冷却工程初期の循環噴流水の温度が高い時期には、実際温度と目標温度の差分に対して冷却用水量制御弁6の開度変更量が少なくなるように設定する。逆に冷却工程終期の循環噴流水温度が低い時期には、実際温度と目標温度の差分に対して冷却用水量制御弁6の開度変更量が多くなるように設定しておく。   When the temperature of the circulating jet water is high at the initial stage of the cooling process, there is a large difference between the temperature of the circulating jet water and the temperature of the cooling water. Therefore, even if the flow rate of the cooling water sent to the heat exchanger 3 is slightly changed, the temperature of the circulating jet water that changes in the heat exchanger 3 becomes relatively large. On the contrary, when the temperature of the circulating jet water is low at the end of the cooling process, the temperature difference between the circulating jet water and the cooling water becomes small. Therefore, even if the flow rate of the cooling water sent to the heat exchanger 3 is changed by the same amount, the temperature of the circulating jet water that changes in the heat exchanger 3 becomes relatively small. Therefore, when the temperature of the circulating jet water at the initial stage of the cooling process is high, the opening change amount of the cooling water amount control valve 6 is set to be smaller than the difference between the actual temperature and the target temperature. Conversely, when the circulating jet water temperature at the end of the cooling process is low, the opening change amount of the cooling water amount control valve 6 is set to be larger than the difference between the actual temperature and the target temperature.

通常のPID制御であれば、目標値との差が同じであれば操作量は同じになるため、循環噴流水温度が高い時期には循環噴流水の温度変化が想定よりも大きくなることによって、殺菌槽内の急激な温度変化を招き、循環噴流水温度が低い時期には循環噴流水の温度変化が想定よりも小さくなることによって、温度が適正になるまでに長い時間がかかることがあった。しかし、本発明を実施することで冷却工程全体を通して目標温度に沿って冷却させることができるようになり、急激な温度変化や目標温度に到達するまでの時間が長く掛かるということがなくなる。   If the difference from the target value is the same in the case of normal PID control, the operation amount will be the same. Therefore, when the temperature of the circulating jet water is high, the temperature change of the circulating jet water becomes larger than expected, When the temperature of the circulating jet water is low, the temperature change of the circulating jet water becomes smaller than expected when the temperature of the circulating jet water is low. . However, by carrying out the present invention, it becomes possible to cool along the target temperature throughout the entire cooling process, so that it does not take a long time until a rapid temperature change or the target temperature is reached.

なお、本発明は以上説明した実施例に限定されるものではなく、多くの変形が本発明の技術的思想内で当分野において通常の知識を有する者により可能である。   The present invention is not limited to the embodiments described above, and many modifications can be made by those having ordinary knowledge in the art within the technical idea of the present invention.

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 冷却用水量制御弁
7 温度検出装置
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 噴射ノズル


DESCRIPTION OF SYMBOLS 1 Sterilization tank 2 Object to be sterilized 3 Heat exchanger 4 Jet water circulation pump 5 Bypass piping 6 Cooling water amount control valve 7 Temperature detection device 8 Cooling tower 9 Cooling water circulation path 10 Cooling water circulation pump 11 Jet water circulation path 12 Operation control device 13 Injection nozzle


Claims (2)

被殺菌物を収容する殺菌槽、途中に熱交換器を持ち殺菌槽との間で循環噴流水を循環させる噴流水循環経路、循環噴流水の温度を検出する温度検出装置、熱交換器で循環噴流水を冷却するために送る冷却用水量を制御する冷却用水量制御弁を持ち、
殺菌槽内の被殺菌物を加熱することで殺菌を行い、その後に被殺菌物の冷却を行うようにしている加熱殺菌装置であって、
被殺菌物の冷却時には、循環噴流水の実際温度と、経過時間に対応させて設定している目標温度の差が小さくなるように冷却用水量制御弁の開度をPID制御し、熱交換器へ送る冷却用水量を調節することで循環噴流水温度を調節するようにしている加熱殺菌装置において、
循環噴流水の実際温度と前記目標温度の差分に対する冷却用水量制御弁の開度変更量は、冷却工程初期の循環噴流水高温時には比較的小さな量とし、逆に冷却工程終期の循環噴流水低温時には比較的大きな量とすることを特徴とする加熱殺菌装置。
A sterilization tank that contains the object to be sterilized, a jet water circulation path that circulates the circulating jet water between the sterilization tank with a heat exchanger in the middle, a temperature detection device that detects the temperature of the circulating jet water, and a circulating jet in the heat exchanger Has a cooling water control valve that controls the amount of cooling water sent to cool the water,
It is a heat sterilization apparatus that performs sterilization by heating the object to be sterilized in the sterilization tank, and then cools the object to be sterilized,
When cooling the object to be sterilized, the opening degree of the cooling water amount control valve is PID controlled so that the difference between the actual temperature of the circulating jet water and the target temperature set corresponding to the elapsed time becomes small, and the heat exchanger In the heat sterilizer that adjusts the temperature of the circulating jet water by adjusting the amount of cooling water sent to
Opening change amount of the cooling water amount control valve for the actual temperature and the difference between the target temperature of the circulating water jets are, during the cooling step the initial circulating water jets hot and relatively small quantities, circulation jet cooling process end to the opposite at the time water cold heat sterilization apparatus characterized by a relatively large amount.
請求項1に記載の加熱殺菌装置において、熱交換器の冷却用水側には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を設置し、冷却用水循環経路には熱交換器をバイパスするバイパス配管を設置しておき、前記冷却揚水量制御弁は前記バイパス配管に設置したものであって、前記冷却揚水量制御弁の開度を調節することによってバイパス配管での流量を制御して熱交換器へ送る冷却用水量を調節するようにしていることを特徴とする加熱殺菌装置。 The heat sterilization apparatus according to claim 1, wherein a cooling water circulation path for circulating cooling water between the heat exchanger and the cooling tower is installed on the cooling water side of the heat exchanger, and the cooling water circulation path has a heat exchanger. Bypass piping is installed, and the cooling pumping amount control valve is installed in the bypass piping, and the flow rate in the bypass piping is controlled by adjusting the opening degree of the cooling pumping amount control valve. And adjusting the amount of cooling water sent to the heat exchanger.
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