Soft boiled egg sterilization system and method

Abstract

A soft boiled egg sterilization system and method relates to the technical field of food processing, and comprises a steam preheating device, a high temperature sterilization device, a cooling device and a sterilization tank; the steam preheating device, the high-temperature sterilization device and the cooling device are all connected with the sterilization tank, and the steam preheating device is used for introducing high-temperature steam into the sterilization tank; the high-temperature sterilization device is used for introducing high-temperature hot water into the sterilization tank after preheating; the cooling device is used for introducing cooling water into the sterilization tank after high-temperature sterilization. According to the method, commercial sterility can be guaranteed, meanwhile, the semi-liquid state of the yolk is kept through the top-speed temperature-rising temperature-controlling and rapid-cooling technology, the soft core character of the yolk can be kept, microorganisms on the surface of the yolk can be killed, the preservation time is long, and the taste is good.

Description

Technical Field

[0001] This invention relates to the field of food processing technology, and more specifically, to a system and method for sterilizing soft-boiled eggs. Background Technology

[0002] Soft-boiled eggs are a new type of processed egg product in my country. They have a unique taste, are rich in nutrients, and are convenient to eat, so they are widely welcomed by the global consumer market and the catering industry. However, since soft-boiled eggs are hard-boiled or seasoned eggs with runny yolks, traditional high-temperature sterilization will cause the yolk to solidify and the egg white to denature excessively, which will ruin the taste. Summary of the Invention

[0003] The present invention aims to provide, for example, a system and method for sterilizing soft-boiled eggs that can maintain the semi-liquid state of the yolk while ensuring commercial sterility (such as killing Salmonella, Escherichia coli, etc.) through rapid heating and temperature control and rapid cooling technology. This not only maintains the soft-boiled texture of the yolk but also kills microorganisms on the surface of the egg white, resulting in a long shelf life and good taste.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a soft-boiled egg sterilization system, comprising: The system includes a steam preheating device, a high-temperature sterilization device, a cooling device, and a sterilization tank. The steam preheating device, the high-temperature sterilization device, and the cooling device are all connected to the sterilization tank. The steam preheating device is used to introduce high-temperature steam into the sterilization tank. The high-temperature sterilization device is used to introduce high-temperature hot water into the sterilization tank after preheating. The cooling device is used to introduce cooling water into the sterilization tank after high-temperature sterilization.

[0005] In an optional embodiment, the soft-boiled egg sterilization system further includes a first recycling device connected to the sterilization tank for recycling hot water.

[0006] In an optional embodiment, the soft-boiled egg sterilization system further includes a second recovery device connected to the sterilization tank for recovering cooling water.

[0007] In an optional embodiment, the soft-boiled egg sterilization system further includes a controller, wherein the steam preheating device, the high-temperature sterilization device, and the cooling device are all communicatively connected to the controller, and the controller is used to control the operating status of the steam preheating device, the high-temperature sterilization device, and the cooling device respectively.

[0008] In an optional embodiment, the steam preheating device includes a steam tank, a steam pipe, and a first valve. The steam tank is connected to the sterilization tank via the steam pipe, and the first valve is installed on the steam pipe and is communicatively connected to the controller.

[0009] In an optional embodiment, the high-temperature sterilization device includes a hot water tank, a hot water pipe, a water pump, and a second valve; the hot water tank is connected to the sterilization tank through the hot water pipe, and the water pump and the second valve are both installed on the hot water pipe; the water pump and the second valve are both communicatively connected to the controller.

[0010] In an optional embodiment, the cooling device includes a cold water tank, a cold water pipe, and a third valve; the cold water tank is connected to the hot water pipe through the cold water pipe, and the connection between the cold water pipe and the hot water pipe is located between the second valve and the water pump; the third valve is installed on the cold water pipe; and the third valve is communicatively connected to the controller.

[0011] Secondly, the present invention provides a method for sterilizing soft-boiled eggs, applied to the soft-boiled egg sterilization system described in any of the foregoing embodiments, the method comprising: Step s100: Use a steam preheating device to introduce steam into the sterilization tank, and turn off the steam preheating device when the set pressure is reached in the sterilization tank; Step s200: After turning off the steam preheating device, start the high-temperature sterilization device and use the high-temperature sterilization device to spray hot water at a temperature of 121-130℃ onto the surface of the soft-boiled eggs to be processed in the sterilization tank for high-temperature sterilization. Step s300: After high-temperature sterilization is completed, a cooling device is used to spray cold water at a temperature not higher than 15°C onto the surface of the soft-boiled eggs to be processed in the sterilization tank for cooling treatment.

[0012] In an optional embodiment, in step s200, the high-temperature sterilization time is controlled to be 120-300 seconds; Or / and, in step s300, the cooling time is controlled within 30 seconds, and the temperature of the soft-boiled egg to be processed is not higher than 50°C.

[0013] In an optional embodiment, in steps s200 and s300, the drain port of the sterilization tank is kept open so that hot water is continuously discharged from the drain port during the high-temperature sterilization process and cooling water is continuously discharged from the drain port during the cooling process.

[0014] The beneficial effects of the embodiments of the present invention include, for example: In summary, the soft-boiled egg sterilization system provided in this embodiment, during product sterilization, after sealing the sterilization tank, firstly, uses a steam preheating device to spray steam into the sterilization tank for preheating. Once the pressure reaches the set requirements, a high-temperature sterilization device sprays high-temperature hot water (e.g., water at 121-130℃) onto the product (soft-boiled egg to be processed) located in the sterilization tank to begin sterilization. After sterilization, the hot water spraying is stopped, and instead, low-temperature cold water (e.g., water at 4-15℃) is sprayed. Simultaneously, the cold water that has sprayed onto the product is drained, allowing the product temperature to drop to a suitable temperature within a specified time (e.g., the center temperature of the soft-boiled egg does not exceed 50℃). This rapid spray sterilization method, using steam to preheat the sterilization tank before sterilization, ensures the product is directly in a 121-130℃ insulated environment, eliminating the need for hot water extraction, heating, and extraction processes, thus shortening the time the product is in contact with water below 121℃. At the same time, by utilizing the low specific heat of steam and the fluidity of water inside the sterilization tank, the two work together to fully and evenly heat the outer layer of the product. Combined with the synergistic effect of ice water cooling, the product's soft texture is also guaranteed. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the process for sterilizing soft-boiled eggs provided in this embodiment.

[0017] icon: 100-Steam preheating device; 110-Steam tank; 120-Steam pipeline; 130-First valve; 200-High temperature sterilization device; 210-Hot water tank; 220-Hot water pipeline; 230-First water pump; 240-Second valve; 300-Cooling device; 310-Cold water tank; 320-Cold water pipeline; 330-Third valve; 340-Cooling unit; 400-Sterilization tank; 410-Drain pipe; 420-Drain valve; 500-First recovery device; 510-First recovery tank; 520-First recovery pipeline; 530-Fourth valve; 540-Second water pump; 550-Heater; 600-Second recovery device; 610-Second recovery tank; 620-Second recovery pipeline; 630-Fifth valve; 700-Controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0024] Please refer to Figure 1 This embodiment provides a soft-boiled egg sterilization system, which includes a steam preheating device 100, a high-temperature sterilization device 200, a cooling device 300, and a sterilization tank 400. The steam preheating device 100, the high-temperature sterilization device 200, and the cooling device 300 are all connected to the sterilization tank. The steam preheating device 100 is used to introduce high-temperature steam into the sterilization tank 400. The high-temperature sterilization device 200 is used to introduce high-temperature hot water into the sterilization tank 400 after preheating. The cooling device 300 is used to introduce cooling water into the sterilization tank 400 after high-temperature sterilization.

[0025] As described above, the working principle of the soft-boiled egg sterilization system provided in this embodiment is as follows: During the sterilization of the product (i.e., the soft-boiled egg), after sealing the sterilization tank 400, steam is first injected into the sterilization tank 400 using the steam preheating device 100 for preheating. Once the pressure reaches the set requirement, high-temperature sterilization device 200 sprays high-temperature hot water (e.g., water at 121-130℃) onto the product (the soft-boiled egg to be processed) inside the sterilization tank 400 to begin sterilization. After sterilization, the hot water spraying is stopped, and low-temperature cold water (e.g., water at 4-15℃) is sprayed instead. At the same time, the cold water that has sprayed onto the product is drained, allowing the product temperature to drop to a suitable temperature within a specified time (e.g., the center temperature of the soft-boiled egg should not exceed 50℃). This rapid spray sterilization method, which preheats the sterilization tank 400 with steam before sterilization, ensures that the product is directly in a 121-130℃ insulated environment, eliminating the need for hot water extraction, heating, and extraction processes, thus shortening the time the product is in contact with water below 121℃. At the same time, by utilizing the low specific heat of steam and the fluidity of water inside the sterilization tank 400, the two work together to fully and evenly heat the outer layer of the product. Combined with the synergistic effect of ice water cooling, the product's soft texture is guaranteed, which not only extends its shelf life and prevents spoilage, but also maintains its taste.

[0026] The following embodiments illustrate the details of the soft-boiled egg sterilization system of this application by way of example.

[0027] Please refer to Figure 1 In this embodiment, optionally, the soft-boiled egg sterilization system includes a steam preheating device 100, a high-temperature sterilization device 200, a cooling device 300, a sterilization tank 400, a first recovery device 500, a second recovery device 600, and a controller 700. The steam preheating device 100, the high-temperature sterilization device 200, the cooling device 300, the first recovery device 500, and the second recovery device 600 are all connected to the sterilization tank 400. The steam preheating device 100, the high-temperature sterilization device 200, and the cooling device 300 are all communicatively connected to the controller 700, which can adjust the operating status of the steam preheating device 100, the high-temperature sterilization device 200, and the cooling device 300. The first recovery device 500 can recover hot water from the sterilization tank 400, and the second recovery device 600 can recover cold water from the sterilization tank 400.

[0028] Optionally, the steam preheating device 100 includes a steam tank 110, a steam pipe 120, and a first valve 130. The steam tank 110 is connected to the sterilization tank 400 through the steam pipe 120. The first valve 130 is installed on the steam pipe 120 and is communicatively connected to the controller 700.

[0029] Optionally, the high-temperature sterilization device 200 includes a hot water tank 210, a hot water pipe 220, a first water pump 230, and a second valve 240. The hot water tank 210 is connected to the sterilization tank 400 via the hot water pipe. The first water pump 230 and the second valve 240 are both installed on the hot water pipe 220, with the second valve 240 located on the side of the first water pump 230 closer to the hot water tank 210. Both the first water pump 230 and the second valve 240 are communicatively connected to the controller 700. The steam pipe 120 can be connected to the hot water pipe 220, with the connection point located on the side of the first water pump 230 closer to the sterilization tank 400. The steam tank 110 and the hot water tank 210 share a portion of the piping, saving materials and reducing costs. During preheating, steam can enter the hot water pipe 220 and the first water pump 230, thereby expelling ambient temperature air from the pipes and preventing the temperature of the hot water flowing from the hot water tank 210 to the sterilization tank 400 from dropping due to cooling.

[0030] Optionally, the cooling device 300 includes a cold water tank 310, a cold water pipe 320, and a third valve 330; the cold water tank 310 is connected to the hot water pipe 220 through the cold water pipe 320, and the connection between the cold water pipe 320 and the hot water pipe 220 is located between the second valve 240 and the water pump; the third valve 330 is installed on the cold water pipe 320; the third valve 330 is communicatively connected to the controller 700.

[0031] In addition, the cold water tank 310 can be connected to the cooling unit 340 to provide the required cooling capacity.

[0032] Optionally, a drain pipe 410 is provided at the bottom of the sterilization tank 400, and a drain valve 420 is provided on the drain pipe 410.

[0033] Optionally, the first recycling device 500 includes a first recycling tank 510, a first recycling pipe 520, a fourth valve 530, and a second water pump 540. The first recycling tank 510 is connected to a drain pipe 410 via the first recycling pipe 520, with the connection point located on the side of the drain valve 420 closer to the sterilization tank 400. Both the fourth valve 530 and the second water pump 540 are installed on the first recycling pipe 520, with the fourth valve 530 located on the side of the second water pump 540 furthest from the sterilization tank 400. Both the fourth valve 530 and the second water pump 540 are communicatively connected to the controller 700.

[0034] It should be understood that the first recycling tank 510 can be connected to the hot water tank 210 via the heater 550 to improve resource utilization efficiency.

[0035] Optionally, the second recycling device 600 includes a second recycling tank 610, a second recycling pipe 620, and a fifth valve 630. The second recycling tank 610 is connected to the sterilization tank 400 through the second recycling pipe 620. Specifically, the second recycling pipe 620 is connected to the drain pipe 410, and the connection point between the two is located between the second water pump 540 and the fourth valve 530. The fifth valve 630 is installed on the second recycling pipe 620 and is communicatively connected to the controller 700.

[0036] It should be understood that the second recycling tank 610 can be connected to the cold water tank 310 through a pipeline assembly to improve resource utilization efficiency.

[0037] It should be understood that, in order to improve safety, pressure relief valves may be installed on steam tank 110, hot water tank 210, sterilization tank and first recovery tank 510.

[0038] It should be noted that the controller 700 can be configured as a PLC control box.

[0039] The soft-boiled egg sterilization system provided in this embodiment can automate operations and improve efficiency by setting the process parameters for each step through the controller 700. For example, the system can be configured to perform four stages of operation through parameter settings: The first stage: pressurization, with parameters set to 1.5P pressure and 30 seconds time. That is, high-temperature steam is input into the sterilization tank 400 using the steam preheating device 100, with a preheating time of 30 seconds. Preheating stops when the pressure inside the sterilization tank 400 reaches 1.5P. This design avoids the risk of the high-temperature sterilization device 200 spraying hot water at a temperature higher than 121℃, which would cause the hot water temperature to drop and thus reduce the sterilization temperature. It also prevents product packaging damage caused by the vaporization of moisture within the product due to heat.

[0040] The second stage: spray sterilization, parameters: temperature 121℃, pressure 1.5P, time 120 seconds. High-temperature hot water at 125℃ is evenly sprayed onto the product from hot water tank 210, and the hot water is promptly discharged from the sterilization tank. This design ensures that the product's surface begins to undergo effective sterilization at 121℃ while it is being heated, eliminating the need for a heating process and shortening the product's heating time, thus guaranteeing the soft-boiled texture of the egg yolk.

[0041] The third stage: cooling and temperature reduction, parameters: temperature 50℃, pressure 1.5P, time 480 seconds. Cold water at 15℃ is evenly sprayed from cold water tank 310 onto the product, and the cooling water is promptly discharged from the sterilization tank. This design aims to quickly lower the surface temperature of the product, preventing heat transfer from the surface to the interior and maintaining the product's consistency.

[0042] Fourth stage: depressurization, parameters: pressure 0P, time 30 seconds.

[0043] The soft-boiled egg sterilization system provided in this embodiment achieves a balance between sterilization effect and texture retention (maintaining the softness of the yolk) through segmented control technology, namely pre-pressurization: introducing compressed air and high-temperature steam -- high-temperature sterilization: spraying high-temperature hot water -- rapid cooling: spraying low-temperature water. This system is suitable for the industrial production of soft-boiled eggs, onsen eggs and other semi-cooked egg products.

[0044] This embodiment also provides a method for sterilizing soft-boiled eggs, applied to the soft-boiled egg sterilization system of the above embodiment, the method comprising: Step s100: Steam is introduced into the sterilization tank 400 using the steam preheating device 100. When the set pressure is reached in the sterilization tank 400, the steam preheating device 100 is turned off. Step s200: After turning off the steam preheating device 100, start the high-temperature sterilization device 200. Use the high-temperature sterilization device 200 to spray hot water at a temperature of 121-130℃ onto the surface of the soft-boiled eggs to be processed in the sterilization tank 400 for high-temperature sterilization. Step s300: After high-temperature sterilization, the cooling device 300 sprays cold water at a temperature not higher than 15°C onto the surface of the soft-boiled eggs to be processed in the sterilization tank 400 for cooling treatment.

[0045] It should be understood that in step s200, the high-temperature sterilization time is controlled within 120-300s; or / and in step s300, the cooling treatment time is controlled within 30s, and the temperature of the soft-boiled egg to be treated is not higher than 50℃, ensuring that the temperature of the yolk does not exceed 60℃.

[0046] It should be noted that in steps s200 and s300, the drain outlet of the sterilization tank 400 is kept open so that hot water is continuously discharged from the drain outlet during the high-temperature sterilization process and cooling water is continuously discharged from the drain outlet during the cooling process, so as to minimize the impact of temperature changes on the sterilization of soft-boiled eggs and the semi-liquid state of the egg yolk.

[0047] The following is an application example of the soft-boiled egg sterilization method of this embodiment: Step 1: First, load the soft-boiled eggs to be sterilized into the rack and push them into the sterilization tank. Seal the tank door and check the safety components. At the same time, check that the hot water tank 210 and the cold water tank 310 have reached the set temperature and pressure. Step 2: One-button start of the sterilization control program of controller 700: First valve 130 is opened, and steam is introduced into sterilization tank 400 through steam tank 110 for preheating. Once the pressure inside sterilization tank 400 reaches the set value (while hot water tank 210 and first recovery tank 510 maintain the same pressure), first valve 130 is closed, and second valve 240 is opened. First water pump 230 draws high-temperature hot water from hot water tank 210 into sterilization tank 400. Through side spray pipes inside sterilization tank 400 (side sprays are spray pipes installed on both sides of each sieve of product, which can evenly spray hot or cold water onto the product, thus ensuring uniform heating), the sterilizing water is atomized and evenly sprayed onto the product surface, raising the product temperature. Because the sterilizing water is preheated and at a high temperature, it accelerates the product's heating and sterilization process. Simultaneously, second valve 240 is opened, and second water pump 540 draws the hot water that has sprayed the product back into first recovery tank 510. After the sterilization time is completed (the sterilization time can be set via controller 700), the hot water at the bottom of sterilization tank 400 is recovered to the recovery water tank, and the third valve 330 is opened. The first valve 130 and the second valve 240 are closed. The first water pump 230 draws cold water from the cold water tank 310 into sterilization tank 400 to spray and cool the product, still using the side spray cooling method. The second water pump 540 then pumps the cold water that has sprayed the product back to the second recovery tank 610. During the cooling process, the pressure relief valve linearly releases the pressure inside sterilization tank 400 to atmospheric pressure.

[0048] Step 3: After sterilization, open the door of sterilization tank 400 to remove the product. Then, heat the hot water in the first recovery tank 510 by passing it through heater 550 and store it in hot water tank 210. The hot water in hot water tank 210 will be maintained at the sterilization temperature. Cooling water from the second recovery tank 610 enters cold water tank 310. The refrigeration unit lowers the water temperature in cold water tank 310 to the operating temperature, preparing for the next sterilization operation.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A system for sterilizing soft-boiled eggs, characterized in that, include: The device comprises a steam preheating device (100), a high-temperature sterilization device (200), a cooling device (300), and a sterilization tank (400). The steam preheating device (100), the high-temperature sterilization device (200), and the cooling device (300) are all connected to the sterilization tank. The steam preheating device (100) is used to introduce high-temperature steam into the sterilization tank (400). The high-temperature sterilization device (200) is used to introduce high-temperature hot water into the sterilization tank (400) after preheating. The cooling device (300) is used to introduce cooling water into the sterilization tank (400) after high-temperature sterilization.

2. The soft-boiled egg sterilization system according to claim 1, characterized in that: The soft-boiled egg sterilization system also includes a first recovery device (500), which is connected to the sterilization tank (400) and is used to recover hot water.

3. The soft-boiled egg sterilization system according to claim 1, characterized in that: The soft-boiled egg sterilization system also includes a second recovery device (600), which is connected to the sterilization tank (400) and is used to recover cooling water.

4. The soft-boiled egg sterilization system according to any one of claims 1-3, characterized in that: The soft-boiled egg sterilization system also includes a controller (700). The steam preheating device (100), the high-temperature sterilization device (200), and the cooling device (300) are all communicatively connected to the controller (700). The controller (700) is used to control the working status of the steam preheating device (100), the high-temperature sterilization device (200), and the cooling device (300) respectively.

5. The soft-boiled egg sterilization system according to claim 4, characterized in that: The steam preheating device (100) includes a steam tank (110), a steam pipe (120), and a first valve (130). The steam tank (110) is connected to the sterilization tank (400) through the steam pipe (120). The first valve (130) is installed on the steam pipe (120) and is communicatively connected to the controller (700).

6. The soft-boiled egg sterilization system according to claim 4, characterized in that: The high-temperature sterilization device (200) includes a hot water tank (210), a hot water pipe (220), a water pump, and a second valve (240); the hot water tank (210) is connected to the sterilization tank (400) through the hot water pipe, and the water pump and the second valve (240) are both installed on the hot water pipe (220); the water pump and the second valve (240) are both communicatively connected to the controller (700).

7. The soft-boiled egg sterilization system according to claim 6, characterized in that: The cooling device (300) includes a cold water tank (310), a cold water pipe (320), and a third valve (330); the cold water tank (310) is connected to the hot water pipe (220) through the cold water pipe (320), and the connection between the cold water pipe (320) and the hot water pipe (220) is located between the second valve (240) and the water pump; the third valve (330) is installed on the cold water pipe (320); the third valve (330) is communicatively connected to the controller (700).

8. A method for sterilizing soft-boiled eggs, characterized in that, The method, applied to the soft-boiled egg sterilization system according to any one of claims 1-7, comprises: Step s100: Steam is introduced into the sterilization tank (400) using a steam preheating device (100). When the set pressure is reached in the sterilization tank (400), the steam preheating device (100) is turned off. Step s200: After turning off the steam preheating device (100), start the high-temperature sterilization device (200) and use the high-temperature sterilization device (200) to spray hot water at a temperature of 121-130℃ onto the surface of the soft-boiled egg to be processed in the sterilization tank (400) for high-temperature sterilization. Step s300: After high-temperature sterilization, a cooling device (300) sprays cold water at a temperature not higher than 15°C onto the surface of the soft-boiled egg to be processed in the sterilization tank (400) for cooling treatment.

9. The method for sterilizing soft-boiled eggs according to claim 8, characterized in that: In step s200, the high-temperature sterilization time is controlled between 120-300 seconds; Or / and, in step s300, the cooling time is controlled within 30 seconds, and the temperature of the soft-boiled egg to be processed is not higher than 50°C.

10. The method for sterilizing soft-boiled eggs according to claim 8, characterized in that: In steps s200 and s300, the drain port of the sterilization tank (400) is kept open so that hot water is continuously discharged from the drain port during the high-temperature sterilization process and cooling water is continuously discharged from the drain port during the cooling process.

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