JP5972136B2 - Circulating steam sterilization system - Google Patents

Description

  The present invention relates to a system for sterilizing powder and granular materials such as foods and pharmaceuticals by direct contact with the circulating steam.

  A circulation type steam sterilization system is known as one method for efficiently sterilizing powder and granular materials such as foods and pharmaceuticals. For example, as shown in FIG. 3 (a), this system circulates steam (exhaust steam S2) discharged from the sterilizer 2 'through the circulatory path 5' to the sterilizer 2 'again, and sterilizer 2'. The sterilization target object W is put into the sterilized quantity at a time, and the sterilization target object W is sterilized with steam. Note that the steam is circulated in such a sterilization system in order to reduce the amount of steam used.

Here, in the conventional circulation type steam sterilization system 1 ', a root type circulation blower (pump) P is often applied as a blower (circulation blower) for circulating steam (a root type circulation blower). (See Patent Document 1).
For example, as shown in FIG. 3 (b), the roots type circulation blower P is formed by incorporating a pair of rotors R in a casing C. The rotor R is formed with a convex portion R1 and a concave portion R2. The rotor R is rotated while maintaining the meshing state in which the convex portion R1 of the other rotor R enters the concave portion R2, and fluid (here, steam) is pumped from the suction port VO to the discharge port DO.

However, the conventional sterilization system using such a roots type circulation blower P has the following problems.
First, since the roots-type circulation blower P itself is expensive, the sterilization system inevitably has a tendency to increase the initial cost. In addition, when sterilizing with high-temperature steam such as superheated steam, some of the volatile components and powder particles in the sterilization target W may be accompanied by the exhaust steam S2, and in addition, the roots type circulation blower P is Since the clearance between the rotor R and the casing C is small, such volatile components and the like are likely to adhere to the constituent members, and this adhesion hinders the rotation of the rotor R and causes an abrupt mechanical stop. Was often difficult. Of course, in such a case, it is necessary to wash the blower to which the volatile component or the like adheres every time, and in some cases, the blower must be decomposed and washed. In addition, because of this structure, the root-type circulation blower P cannot be cleaned by CIP (Cleaning In Place), and if it is considered to be worn or corroded, an overhaul of the rotor R or casing C is required. Therefore, the labor and cost of maintenance are increased.

JP 2005-111320 A

  The present invention has been made in view of such a background. By using an ejector-type circulation device instead of a root-type circulation blower in the circulation-type steam sterilization system, the circulation-type steam sterilization system described above is used. The present invention relates to a novel circulating steam sterilization system that solves the above problem.

First, the circulating steam sterilization system according to claim 1 is:
In the sterilization system in which the object to be sterilized put into the sterilizer is sterilized by directly contacting with the steam, and the exhausted steam after the sterilization process is used again for the sterilization process by the circulation path.
The object to be sterilized is a granular material that can be transferred by being accompanied by steam, and in sending the steam to the sterilizer, an ejector pump is applied ,
In addition, this ejector pump sucks exhaust steam into the ejector pump by feeding the drive steam into the ejector pump, mixes and compresses both the steam in the ejector pump, and then feeds the steam into the sterilizer to circulate the steam. It is what
Further, the pressure of the steam in the circulation steam sterilization system is maintained by sending the driving steam into the ejector pump and exhausting a part of the exhaust steam from the circulation steam sterilization system. It is characterized by this.

In addition to the requirement of claim 1, the circulating steam sterilization system of claim 2
The sterilization target is sterilized with superheated steam.

The circulating steam sterilization system according to claim 3, in addition to the requirements of claim 1 or 2,
The driving steam is generated by heating saturated steam with a heater,
In addition, the temperature of the heater is controlled by the detected temperature between the ejector pump and the sterilizer or the detected temperature between the sterilizer and the circulation path, thereby controlling the degree of superheat of the driving steam. The circulating steam sterilization system according to claim 1 or 2 .

Moreover, in addition to the requirements of the said Claim 1, 2, or 3 , the circulation type steam sterilization system of Claim 4 WHEREIN:
The circulation path is provided with a heater in the form of a jacket so as to prevent the temperature of exhaust steam from decreasing.

Moreover, in addition to the requirements of the said Claim 1, 2, 3 or 4 , the circulation type steam sterilization system of Claim 5 is provided,
In putting the sterilization object into the sterilizer, the steam mixed and compressed in the ejector pump and the sterilization object are put in contact with each other.

According to the first aspect of the present invention, since the steam is sent to the sterilization apparatus by the ejector pump, for example, a part of the volatile component or the granular material in the object to be sterilized is entrained by the steam and enters the circulation path. Even if it adheres to the inside, there is no mechanical moving part (mechanical moving part) in the ejector pump itself, so it is possible to avoid a situation where the adhering substance causes a sudden mechanical stop, and a long continuous operation is suddenly interrupted. The risk of being done is low. In addition, since the ejector pump itself has no mechanical moving parts, maintenance is not required, maintenance costs can be reduced, and maintenance-free operation is possible. Further, since the structure of the ejector pump is simple, a simple structure can be adopted as a circulation type steam sterilization system, and the initial cost can be kept low.
Incidentally, in the past, in this type of circulation steam sterilization system, a roots type circulation blower is often applied, and in that case, a part of volatile components and granular materials in the sterilization target are removed. If it adheres to the rotor or casing constituting the circulation blower, the power of the blower increases (becomes high load), suddenly becomes overloaded power, and suddenly stops mechanically. . In addition, in order to remove the deposits, the maintenance of the blower is time consuming and the maintenance cost is increased. In addition, the root-type circulating blower having a mechanically movable part such as the rotor described above cannot perform CIP cleaning (Cleaning In Place), and the blower itself is expensive. It was a cost.
Further, according to the present invention, the drive steam and the exhaust steam are mixed and compressed by the ejector pump, sent to the sterilizer, and the exhaust steam discharged from the sterilizer is circulated. It can be used for sterilization, and the amount of driving steam sent to the ejector pump is reduced, so that efficient operation can be performed.
Moreover, according to this invention, it can suppress that external air penetrate | invades into this circulation type steam sterilization system, and can maintain the flow volume of a vapor | steam suitable for sterilization.

  According to the invention described in claim 2, since the sterilization target is sterilized with superheated steam having both dry heat and wet heat properties and also having large heat energy, it can be sterilized uniformly in a short time. It is less likely to cause thermal damage to the object to be sterilized.

According to the invention described in claim 3, it is possible to suppress excessive heat from being applied to the object to be sterilized and cause thermal damage, and appropriate sterilization can be performed.

According to the invention of claim 4 , since the heater can prevent the temperature of the steam from being lowered during the transfer of the exhaust steam back to the ejector pump, the operation is more efficient (operation without waste using exhaust steam). Can be done.

Further, according to the invention described in claim 5, since the sterilization target to be put into the sterilization apparatus is put into contact with the mixed and compressed drive steam and exhaust steam in the ejector pump, The state (temperature, pressure, etc.) of the steam (mixed / compressed steam) for sterilizing the object can be further stabilized, and more reliable and uniform sterilization can be performed.

It is explanatory drawing (a) which shows an example of the circulation type steam sterilization system of this invention skeleton, and the detailed view (b) which expands and shows the ejector pump as a circulation apparatus. It is explanatory drawing which shows the form and preferable form which can be taken on control and management in the circulation type steam sterilization system of this invention. It is explanatory drawing (a) which shows the conventional circulation type steam sterilization system using a roots type circulation blower skeleton, and the detailed view (b) which expands and shows a roots type circulation blower.

  The mode for carrying out the present invention includes one described in the following embodiments, and further includes various methods that can be improved within the technical idea.

  The circulation type steam sterilization system 1 of the present invention is a system for sterilization by directly bringing steam into contact with the sterilization object W, and the sterilized steam is circulated again as sterilization steam. At this time, it is a major feature of the present invention that the ejector pump 4 is applied as a circulation device for circulating the steam. Incidentally, in this embodiment, high-pressure and high-temperature superheated steam (superheated steam) is used as the sterilizing steam. This is because the superheated steam has both dry heat and wet heat properties and is large as heat energy. This is because the sterilization object W can be sterilized uniformly in a short time without causing thermal damage. Of course, sterilization is not limited to such superheated steam, and it is also possible to use low-temperature steam or the like.

  Further, the ejector pump 4 itself is already known, and its action is achieved by flowing a high-pressure fluid (here, steam, which is referred to as driving steam S1) into the pump (in the body) at high speed. The other fluid (here, the steam discharged from the sterilizer 2 and this is the exhaust steam S2) is sucked from another path communicating with the pump (body), mixed, and sent to the sterilizer 2. is there.

  Here, the steam described in this specification is organized (distinguished). In the present embodiment, the saturated steam S0 is first heated to generate superheated steam, which is used as the driving steam S1 as described above, and this driving steam S1 is sent to the ejector pump 4 at high speed. Since this driving steam S1 forms a high-speed flow in the ejector pump 4, the exhaust steam S2 is sucked into the ejector pump 4 by this action, and the driving steam S1 and the exhaust steam S2 are mixed and compressed in the ejector pump 4. The steam is fed into the sterilizer 2, and this steam is referred to as mixed / compressed steam S3. That is, the sterilization target W is substantially sterilized by the mixed / compressed steam S3.

  Incidentally, a conventional ejector (corresponding to the ejector pump 4 in this specification) is often used as a suction pump for depressurizing a sterilization chamber (sterilization space) (for example, JP-A-11-332532 and JP 2000-202007 A). In this respect, the present invention is greatly different in that an ejector is used as a pump or a compressor for circulating steam, and this point is epoch-making. In the conventional case where the ejector is used as a suction pump for decompressing the sterilization chamber (sterilization space), the sterilization is mainly performed by low-temperature steam.

  Here, the sterilization target W which is the sterilization target in the present invention will be described. A wide variety of powders such as “powder raw material”, “kisaki raw material”, “grain raw material” are suitable as the sterilization target W, and the uses and types of the sterilization target W include spices, crude drugs, cereals. , Fish meal, dried vegetables, and tea leaves. In the present invention, such a sterilization target W is sterilized by directly contacting with steam. In other words, it can be said that the material that can be accompanied by the steam is suitable for sterilization. Moreover, in this specification, the sterilization target object W after sterilization is called the product W1.

Hereinafter, the circulation type steam sterilization system 1 of the present invention will be described in more detail.
In the following description, the term “heat sterilization system” is also used, which mainly refers to a portion where steam in a high pressure and high temperature state exists, in other words, a portion where it is necessary to maintain a high pressure and high temperature state. is there.
As shown in FIG. 1 (a) as an example, the circulation type steam sterilization system 1 of the present invention includes a sterilization apparatus 2 that performs sterilization by bringing the sterilization object W into direct contact with steam, and steam for sterilization (here, overheating). A steam generator 3 for generating steam), an ejector pump 4 as a circulator for sending the steam to the sterilizer 2 in a circulating state, and an exhaust steam S2 discharged from the sterilizer 2 for returning to the ejector pump 4 A circulation path 5, a charging device 6 for loading the sterilization object W into the sterilization device 2, and a take-out device 7 for taking out the product W 1, which is the sterilization target W after sterilization processing, from the sterilization device 2. It consists of.
Hereinafter, each component will be described.

First, the sterilizer 2 will be described. As described above, the sterilizing apparatus 2 is a part that mainly performs sterilization by bringing the sterilization target W into direct contact with steam, but in this embodiment, the sterilized product W1 is converted from steam (steam after heat sterilization). The concept includes the function of separating (separator).
Here, the temperature of the superheated steam sent to the sterilizer 2 (the temperature of the mixed / compressed steam S3, which is almost the sterilization temperature) can take various numerical values, but the saturation temperature (uniquely determined from the set pressure) ( The temperature (superheated temperature) is higher than the temperature of the saturated water vapor. Specifically, for example, under a pressure of 0.2 MPa · G, since 133 ° C. is the saturation temperature, superheated steam having a higher temperature, for example, 180 ° C. is generated and sterilized with superheated steam at this temperature. can do. Incidentally, the superheat degree of the superheated steam in this case is 47 ° C. which is a difference from the saturation temperature.
Of course, in the present embodiment, since the sterilization is performed using such superheated steam, the heat sterilization system including the sterilizer 2 is configured to withstand the high pressure and high temperature of the superheated steam.
Specifically, the main sterilization treatment is performed by causing the sterilization object W to flow along with the steam in the stainless steel pipe. Further, as a separator connected to the stainless steel pipe and separating the sterilized product W1 and the steam (exhaust steam S2), a cyclone (steam separating cyclone) not shown in the figure, and a lower part of the cyclone are described in detail. A configuration including a rotary valve 71 described later can be applied.
The mixed / compressed steam S3 sent into the sterilizer 2 is temporarily deprived of heat due to contact with the sterilization target W immediately after the sterilization target W is charged, and thus the temperature is lowered. It is also possible to provide a heater for heat supply (not shown) and reheat the mixed / compressed steam S3 whose temperature has decreased.

  Next, the steam generation unit 3 will be described. The steam generation unit 3 is a part that generates driving steam S1 (here, superheated steam) that is sent to the ejector pump 4, and in this embodiment, for example, as shown in FIG. Heating generates superheated steam (driving steam S1) having an appropriate pressure and temperature.

Next, the ejector pump 4 will be described. As described above, the ejector pump 4 serves as a circulation device that circulates the exhaust steam S2. As shown in FIG. 1B, the ejector pump 4 includes a body 41, a nozzle 42, and a diffuser 43. It is made up of.
For example, as shown in FIG. 1B, the body 41 is formed in a T-shaped pipe shape having openings in three directions, and a nozzle 42 and a diffuser 43 are connected to the two openings in the straight direction as a direct passage. The And, the exhaust steam intake port 41E, which is another opening, is formed in a communicating state so as to be substantially orthogonal to the straight passage, and the exhaust steam S2 is sucked into the body 41 from here through the circulation path 5. is there.

The nozzle 42 is attached to the body 41, and a steam discharge port 42D located in the body 41 is formed in a tapered shape so that the flow velocity of the driving steam S1 ejected therefrom is increased (nozzle). The reason is called). Note that the steam discharge port 42 </ b> D of the nozzle 42 is installed so as to face the steam receiving port 43 </ b> E of the diffuser 43.
The diffuser 43 also includes a throttle mechanism 44 formed so that the middle of the pipe for transferring the steam (mixed / compressed steam S3) becomes narrow, which efficiently mixes the driving steam S1 and the exhaust steam S2.・ To compress. In the diffuser 43, the steam receiving port 43E is provided at a distance from the steam discharge port 42D of the nozzle 42. With this configuration, when the driving steam S1 is ejected from the nozzle 42, the inside of the body 41 is decompressed. Then, the exhaust steam S2 is sucked from the circulation path 5 (so-called Venturi effect).
Further, a heater or the like (not shown) is provided outside the path through which the ejector pump 4 (especially the diffuser 43) or the mixed / compressed steam S3 flows, and the temperature of the mixed / compressed steam S3 generated in the pump is provided. It is preferable to prevent the decrease.

Next, the circulation path 5 will be described. The circulation path 5 is a path for collecting the exhaust steam S2 discharged from the sterilizer 2 as described above and sending it to the ejector pump 4, and is a circuit for circulating and using the exhaust steam S2, for example, a stainless steel pipe or the like. Is used. In addition, since the circulation path 5 having a function as such a recovery pipe is also a part constituting the heat sterilization system, the circulation path 5 is formed so as to be able to withstand the high pressure and high temperature of the superheated steam (exhaust steam S2). Formed so that it can be maintained).
The circulation path 5 is also preferably provided with a heater 51 or the like in order to prevent a decrease in temperature during transfer due to the circulation and use of the exhaust steam S2. As a result, the temperature drop of the exhaust steam S2 when sucked into the ejector pump 4 can be prevented, and the generation of the mixed / compressed steam S3 in the pump and the sterilization of the sterilization target W can be performed more stably. .
Here, as the heater 51, for example, a type in which heating steam is passed through a jacket structure provided so as to cover the circulation path 5 from the outside can be adopted. Alternatively, the heater 51 may be provided by providing an electric trace heater outside the circulation path 5. A temperature sensor (not shown) for measuring the temperature of the exhaust steam S2 in the circulation path 5 is provided in the vicinity where the circulation path 5 is connected to the exhaust steam intake port 41E, and the temperature becomes a predetermined temperature. The heating state of the heater 51 is controlled, and basically the exhaust steam S2 of the circulation path 5 is controlled so that the overheated state is maintained.

Next, the charging device 6 will be described. The charging device 6 supplies the sterilization object W to the sterilization device 2 by a substantially constant amount. Here, the rotary valve 61 of high pressure and high temperature specification is applied, and the sterilization object W is supplied to the sterilization device 2 through this. throw into. The reason why the rotary valve 61 is set to the high pressure and high temperature specification is that the inside of the heat sterilization system including the sterilization apparatus 2 is in a high pressure and high temperature state during the sterilization treatment. That is, in order to prevent the steam leakage at the time of throwing in the sterilization target W as much as possible, and to maintain the high pressure and high temperature state in the heat sterilization system as much as possible, the sealing property is excellent.
Of course, when putting the sterilization object W into the sterilization apparatus 2, it is not limited to the rotary valve 61, but a high pressure and high temperature in the pressure sterilization system, such as double provision of screw type valves and butterfly valves. As long as the state can be maintained, various valve forms and installation modes can be adopted.

  Next, the take-out device 7 will be described. The take-out device 7 takes out the product W1 after the sterilization treatment from the sterilization device 2 (separated from the exhaust steam S2), and here again, the product W1 is removed from the sterilization device 2 through the high-pressure high-temperature rotary valve 71. It is something to take out. Of course, various types of valves and installation modes can be adopted at the time of taking out as well as at the time of loading.

Next, the effect of the circulating steam sterilization system 1 of the present invention in which the exhaust steam S2 is circulated using the ejector pump 4 will be described.
First, the ejector pump 4 has no mechanical moving parts (moving members), has a very simple structure, does not require consumables such as bearings and seals, and can be used not only as a circulation device but also as a whole sterilization system. The initial cost can be kept low. Further, since there are no mechanical movable parts, maintenance is not time consuming (good maintainability), maintenance and management costs are reduced, and maintenance-free operation is possible. In addition, even if a part of the granular material in the sterilization target W or a component that volatilizes during the sterilization process is carried by the exhaust steam S2, the structure does not easily cause adhesion, and even if it adheres to the ejector pump 4 Therefore, troubles such as sudden stoppage due to adhesion can be avoided, and continuous operation for a long time is also possible. Further, since the ejector pump 4 has a simple piping structure as shown in FIG. 1 (b), the CIP cleaning can be performed.

The circulation type steam sterilization system 1 of the present invention has the basic structure as described above. Hereinafter, an operation mode in which the sterilization target W is sterilized by this system will be described.
First, a predetermined high pressure and high temperature superheated steam (driving steam S1) is generated from the saturated steam S0 in the steam generating unit 3. This superheated steam (driving steam S1) is sent to the nozzle 42 of the ejector pump 4, and then the steam (mixed / compressed steam S3) is flown at a subsonic, sonic or supersonic speed in the throttle mechanism 44 of the diffuser 43. Thus, the inside of the body 41 is depressurized by this high-speed flow, and the exhaust steam S2 is sucked from the exhaust steam intake port 41E through the circulation path 5. For this reason, the drive steam S1 and the exhaust steam S2 are mixed and compressed in the ejector pump 4, and are sent from the diffuser 43 to the sterilizer 2 in this state.
On the other hand, in the sterilization apparatus 2 in which the mixed / compressed steam S3 flows as an air current, the sterilization object W is supplied from the charging device 6 through the rotary valve 61 of high-pressure and high-temperature specifications in a fixed amount. The material W is dispersed and floated in the steam (mixed / compressed steam S3) flowing in the sterilizer 2, that is, it is transported along with the steam, and is instantly sterilized by heating.

The product W1 thus sterilized is then separated from the exhaust steam S2, and then taken out from the sterilizer 2 (heat sterilization system) by the take-out device 7 via the rotary valve 71 having a high-pressure and high-temperature specification.
Incidentally, the time from when the sterilization object W is put into the sterilization apparatus 2 (that is, after coming into contact with the steam) to be taken out as the product W1 is about 4 to 5 seconds as an example.
The sterilization target W is sterilized by direct contact with the steam (mixed / compressed steam S3), but simultaneously with this contact, the sterilization target W becomes hot (the product temperature is about the saturation temperature of the steam), and Since the water temperature in the sterilization object W rises (because some steam is accompanied), the product W1 taken out from the sterilization apparatus 2 is dehumidified and cooled (product collection cyclone etc. not shown) Recovered at).
On the other hand, the exhaust steam S2 discharged from the sterilizer 2 is introduced into the ejector pump 4 (inside the body 41) through the circulation path 5 by the suction action by the ejector pump 4 (suction action generated by the high-speed flow of the drive steam S1). The

In the circulation steam sterilization system 1, various valves and sensors can be provided. For example, in FIG. 2, a regulating valve 81, a temperature sensor 82 (82A), a discharge valve 83, a pressure sensor 84, and the like are provided. These functions and purposes will be described below.
In the sterilization treatment, the pressure in the sterilization apparatus 2 may drop when the sterilization object W is put into the sterilization apparatus 2 or when the product W1 is taken out from the sterilization apparatus 2 (the sterilization apparatus at the time of introduction or removal) leak vapor in 2, the pressure of the circulating Shiki蒸 vapor sterilization system 1 decreases). In consideration of such a case, for example, as shown in FIG. 2, in order to adjust the amount of steam sent to the sterilizer 2, for example, an adjustment valve 81 is provided in front of the heater 31 that sends saturated steam S0, It is possible to finely adjust the amount of steam sent to the heat sterilization system. Specifically, when the pressure sensor 84 detects that the pressure on the downstream side of the sterilizer 2 has decreased, the steam sent to the heating sterilization system by increasing the saturated steam S0 sent to the heater 31 by operating the adjustment valve 81 It is possible to increase the amount.
On the other hand, there is also the pressure of the vapor of the circulating steam sterilization system 1 is increased, in this case, for example, pressure on the downstream side of the sterilizing apparatus 2 is detected by the pressure sensor 84 that exceed a predetermined pressure Based on this detection, it is possible to open the discharge valve 83 and exhaust the steam out of the circulating steam sterilization system 1 to reduce the pressure.
By maintaining the pressure in the circulating steam sterilization system 1 in this way, it is possible to suppress the entry of outside air into the system and maintain a steam flow rate suitable for sterilization.

  Further, when it is desired to accurately maintain the temperature of the steam (mixed / compressed steam S3) fed to the sterilizer 2 at a predetermined value, for example, between the ejector pump 4 and the sterilizer 2 as shown in FIG. A temperature sensor 82 is provided, and the temperature (degree of superheat) of the heater 31 that heats the saturated steam S0 can be automatically controlled by the detected temperature. That is, for example, when the temperature detected by the temperature sensor 82 falls below a set value, the temperature of the heater 31 is increased. Alternatively, instead of providing the temperature sensor 82 between the ejector pump 4 and the sterilizer 2, as shown in FIG. 2 as an example, a temperature sensor 82A is provided in the vicinity of the connection between the sterilizer 2 and the circulation path 5. It is also possible to automatically control the heater 31 with the temperature sensor 82A.

DESCRIPTION OF SYMBOLS 1 Circulation type | formula steam sterilization system 2 Sterilization apparatus 3 Steam production | generation part 4 Ejector pump 5 Circulation path 6 Input device 7 Extraction device

3 Steam generator 31 Heater

4 Ejector Pump 41 Body 41E Exhaust Steam Intake Port 42 Nozzle 42D Steam Outlet 43 Diffuser 43E Steam Inlet 44 Throttle Mechanism

5 Circulation path 51 Heater

6 Dosing device 61 Rotary valve (high pressure / high temperature specification rotary valve)

7 Unloader 71 Rotary valve (Rotary valve with high pressure and high temperature specifications)

81 Adjusting valve 82 Temperature sensor 82A Temperature sensor 83 Release valve (relief valve)
84 Pressure sensor

W Object to be sterilized W1 product

S0 saturated steam
S1 Drive steam S2 Exhaust steam
S3 Mixed / compressed steam

P Roots type circulation blower C Casing R Rotor R1 Convex R2 Concave VO Suction port DO Discharge port

Claims (5)

In the sterilization system in which the object to be sterilized put into the sterilizer is sterilized by directly contacting with the steam, and the exhausted steam after the sterilization process is used again for the sterilization process by the circulation path.
The object to be sterilized is a granular material that can be transferred by being accompanied by steam, and in sending the steam to the sterilizer, an ejector pump is applied ,
In addition, this ejector pump sucks exhaust steam into the ejector pump by feeding the drive steam into the ejector pump, mixes and compresses both the steam in the ejector pump, and then feeds the steam into the sterilizer to circulate the steam. It is what
Further, the pressure of the steam in the circulation steam sterilization system is maintained by sending the driving steam into the ejector pump and exhausting a part of the exhaust steam from the circulation steam sterilization system. Circulating steam sterilization system characterized by that.
The circulating steam sterilization system according to claim 1, wherein the sterilization target is sterilized by superheated steam.
The driving steam is generated by heating saturated steam with a heater,
In addition, the temperature of the heater is controlled by the detected temperature between the ejector pump and the sterilizer or the detected temperature between the sterilizer and the circulation path, thereby controlling the degree of superheat of the driving steam. The circulating steam sterilization system according to claim 1 or 2 .
The circulating steam sterilization system according to claim 1, 2, or 3 , wherein a heater is provided in a jacket shape in the circulation path to prevent a temperature drop of exhaust steam.
Wherein when turning on the sterilizing objects to sterilizing apparatus includes a vapor which is mixed and compressed in the ejector pump, according to claim 1, 2, 3 or 4, wherein that charged as sterilized object is in contact Circulating steam sterilization system.

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