JP2014159360A - Chlorine dioxide gas generating system, and chlorine dioxide gas decomposing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of generating chlorine dioxide gas and also decomposing chlorine dioxide gas in a shorter time than before.SOLUTION: A chlorine dioxide gas generating system includes a chlorine dioxide gas generating device 2 that generates chlorine dioxide gas, and a chlorine dioxide gas decomposing device 5 that takes in the residual gas of the chlorine dioxide gas output into a room from the chlorine dioxide gas generating device 2 and decomposes it. The chlorine dioxide gas decomposing device 5 includes a filter medium including at least one of manganese oxide and permanganate.

Description

  The present invention relates to a chlorine dioxide gas generation system and a chlorine dioxide gas decomposition apparatus.

  There are techniques for sterilizing or sterilizing microorganisms using chlorine dioxide gas or killing small insects such as scallops. When chlorine dioxide gas comes into contact with the protein of the microbial cell, it generates oxygen radicals to oxidize the protein, and at the same time, it reacts with sodium contained in the microorganism to become NaCl. Chlorine dioxide gas reacts when it comes into contact with proteins.

(Chemical formula 1)
ClO ₂ + Na of protein → oxidized protein + NaCl

  Since chlorine dioxide gas is less toxic to the human body than other chlorine, sodium hypochlorite, and hydrogen peroxide, sterilization and sterilization can be performed more safely. In addition, chlorine dioxide gas has a high sterilizing power per unit weight, exhibits an excellent sterilizing and sterilizing effect against spores, fungi, bacteria, viruses and the like, and has an advantage of not generating carcinogenic substances.

  On the other hand, chlorine dioxide gas is highly reactive and unstable, and is difficult to store at a constant concentration over a long period of time. Therefore, conventionally, a method has been adopted in which sodium chlorite and an acidic liquid are supplied into a container and chlorine dioxide gas is generated by a chemical reaction between the two. For example, when sodium chlorite solution and malic acid solution are mixed, chlorine dioxide gas is generated.

  As a technique for generating chlorine dioxide gas, for example, there are techniques described in Patent Documents 1 and 2. In the techniques described in Patent Literatures 1 and 2, chlorine dioxide gas is generated by reacting a powder of sodium chlorite with an acidic liquid. In the technique described in Patent Document 1, the concentration of sodium chlorite supplied into the container is limited to 10 g or less, thereby preventing a local concentration increase. In addition, in the technique described in Patent Document 2, in addition to preventing the local concentration of chlorine dioxide gas from exceeding 10% of the explosion limit, the reaction is accelerated by heating from the outside of the container, and the reaction is predetermined. I try to finish it in time. In addition, as shown in FIG. 21 of Non-Patent Document 1, chlorine dioxide gas having a peak concentration exceeding 100 ppm (gas concentration) generated in a sealed space requiring fumigation disinfection starts from 10 hours. It is disclosed that it takes 15 hours to decompose and reach a safe concentration of 0.1 ppm or less.

JP 2009-234857 A JP 2010-207539 A

Takamasa Iwaki, 3 others, “Fumigation of animal breeding room with chlorine dioxide gas”, Tokyo Jikei University School of Medicine, Laboratory Animal Research Facility, Takasago Thermal Engineering Co., Ltd., November 29, 2008, Japan Society for Experimental Animal Environment Symposium, Laboratory Animals and Environment, 17 (1), 23-27, 2009

Chlorine dioxide gas is highly reactive and unstable and reacts with dirt present on the surfaces of various articles in the surrounding space to generate salts such as NaCl and decompose them. Therefore, it is said that it is difficult to store at a constant concentration over a long period of time. On the other hand, chlorine dioxide gas has been reported to take a long time to decompose. For example, Non-Patent Document 1 discloses that chlorine dioxide gas having a peak concentration exceeding 100 ppm generated in a sealed space that requires fumigation is decomposed in 10 to 15 hours if left as it is, It is described that the maximum safe concentration of 0.1 ppm or less allowed for workers for 8 hours per day as defined by WHO is described. Therefore, if chlorine dioxide gas disinfection and sterilization is performed in spaces such as pharmaceutical facilities, food manufacturing facilities, bio-research facilities, and medical operating rooms, the chlorine dioxide gas is generated and then the concentration becomes a safe level. It will take more than half a day to resume production, experimentation, and surgery in the space created. In the meantime, production activities, research activities, and medical practices in the space must be interrupted. Therefore, conventionally, after the time required for disinfection and sterilization of the target space after gas generation, for example, 3 hours, chlorine dioxide gas is adsorbed and decomposed by the activated carbon filter in the space, and the chlorine dioxide gas outside the space is removed from the space. It has been attempted to speed up the resumption of use of the target space by devising such that the residual chlorine dioxide concentration in the space can be reduced to a safe concentration of 0.1 ppm or less in the shortest possible time by substituting and diluting with air that does not contain. However, even in this case, it took several hours to reduce the concentration of the residual gas.

  In view of the above problems, an object of the present invention is to provide a technique capable of generating chlorine dioxide gas and capable of decomposing chlorine dioxide gas in a shorter time than before.

  In order to solve the above-described problems, the present invention generates chlorine dioxide gas and decomposes chlorine dioxide gas using a filter medium containing at least one of manganese oxide and permanganate. .

  More specifically, the present invention relates to a chlorine dioxide gas generator for generating chlorine dioxide gas, a chlorine dioxide gas decomposer for taking in and decomposing residual gas of chlorine dioxide gas released into the room from the chlorine dioxide gas generator, and The chlorine dioxide gas decomposing apparatus includes a filter medium containing at least one of manganese oxide and permanganate.

The chlorine dioxide gas generation system according to the present invention includes a chlorine dioxide gas generation device, so that sterilization and sterilization can be performed more safely than other chlorine, sodium hypochlorite, and hydrogen peroxide. it can. Further, since chlorine dioxide gas does not have a strong odor like chlorine, it can reduce the unpleasant odor when performing sterilization and sterilization. Furthermore, chlorine dioxide gas has a high bactericidal power per unit weight, exhibits excellent sterilization and bactericidal effects against spores, fungi, bacteria, viruses and the like, and does not produce carcinogenic substances. Moreover, the chlorine dioxide gas generation system which concerns on this invention can decompose | disassemble chlorine dioxide gas in a shorter time than before by providing a chlorine dioxide gas decomposition | disassembly apparatus. By containing at least one of manganese oxide and permanganate in the filter medium, compared with conventional activated carbon, the decomposition performance of chlorine dioxide gas is further improved and the decomposition time until a safe concentration is reached. It can be made shorter. An example of the safe concentration is a safe maximum concentration of 0.1 ppm that is allowed by an operator for 8 hours a day as defined by the WHO. The present inventors have found that at least one of manganese oxide and permanganate is effective for the decomposition of chlorine dioxide gas. Examples of manganese oxide include manganese dioxide (MnO ₂ ), dimanganese trioxide (Mn ₂ O ₃ ), and trimanganese tetroxide (Mn ₃ O ₄ ). Examples of permanganate include M ^I MnO ₄ (M ^I represents an alkali metal), M ^II (MnO ₄ ) ₂ (M ^II represents an alkaline earth metal), and the like. The present invention may be used not only for sterilization and sterilization of spores, molds, bacteria, and inactivation of viruses, but also as a technique for killing micro insects such as chatterworms.

  The chamber is exemplified by a sealed space that requires fumigation. Specifically, the room is exemplified by a sealed space required for fumigation disinfection in a pharmaceutical manufacturing facility, a food manufacturing facility, a bio research facility, and a medical facility.

  The filter medium is, for example, a granular pellet obtained by solidifying manganese oxide powder with a binder, or a pellet obtained by solidifying a powder containing the above-mentioned permanganate into a porous piece of activated carbon or zeolite with a binder. It can be set as the filled layer filled in the airtight container which has two openings of an exit. Further, the filter medium may be a honeycomb filter in which activated carbon or zeolite porous powder containing manganese oxide powder or permanganate is fixed with a binder on the gas contact surface of a breathable honeycomb structure.

  The decomposition of chlorine dioxide gas by manganese oxide is presumed to be due to a disproportionation reaction as shown in the following reaction formula. According to the following reaction formula, it is presumed that the decomposition performance is preferably higher in the relative humidity in the air.

(Chemical formula 2)
2ClO ₂ + H ₂ O → HClO ₂ + HClO ₃

  Therefore, the chlorine dioxide gas generation system according to the present invention may further include a humidifier that humidifies the room to a predetermined humidity. By providing the humidifier, the room can be humidified to a predetermined humidity. As a result, the decomposition performance of chlorine dioxide gas can be further enhanced. The predetermined humidity may be 50% to 70%, more preferably 55% to 65%. As described above, since the room from which chlorine dioxide gas is released can be a sealed space, the humidity in the room is maintained for a certain period of time once the room is humidified. Therefore, the humidifier may humidify the room to a predetermined humidity before the chlorine dioxide gas generator is operated. Further, the humidifier may humidify the room to a predetermined humidity while the chlorine dioxide gas generator is operating. When the humidifier humidifies the room to a predetermined humidity before the operation of the chlorine dioxide gas generator, the humidifier can humidify the air taken in from the room. In addition, when the humidifier humidifies the room to a predetermined humidity while the chlorine dioxide gas generator is in operation, the humidifier may humidify the air taken in from the room, and the air in which the chlorine dioxide gas is decomposed In other words, the air that has passed through the chlorine dioxide gas decomposition apparatus may be humidified.

  Here, the chlorine dioxide gas generation system according to the present invention is provided with a first path through which air taken in from the room passes and the chlorine dioxide gas generation device is provided, and the chlorine dioxide gas decomposition device. The second path through which the air decomposed by the chlorine dioxide gas decomposition apparatus flows and the third path through which the humidifier is provided and the air humidified by the humidifier may flow may be further provided.

  A chlorine dioxide gas generator is provided in the first path. Therefore, during the operation of the chlorine dioxide gas generator, outdoor air such as outdoor air or air taken from the room flows upstream from the chlorine dioxide gas generator of the first path, and chlorine dioxide of the first path Chlorine dioxide gas generated from the chlorine dioxide gas generator flows downstream from the gas generator. When the chlorine dioxide gas generator is not in operation, the air (return air) taken from the room may simply flow through the first path. By providing the chlorine dioxide gas generator with a filter that captures impurities contained in the air, it becomes possible to capture impurities contained in the air flowing through the first path. When returning air is circulated through the first path, one end can be provided at an intake port for taking in indoor air, and the other end can be provided at a blower outlet for sending chlorine dioxide gas into the room.

The second path is provided with a chlorine dioxide gas decomposing apparatus. During operation of the chlorine dioxide gas decomposing apparatus, air taken in from the room is located upstream of the second path chlorine dioxide gas decomposing apparatus. The air in which the chlorine dioxide gas is decomposed by the chlorine dioxide gas decomposing apparatus flows downstream from the second path chlorine dioxide gas decomposing apparatus. When returning the air after decomposition | disassembly to a room | chamber interior, a 2nd path | route can provide one end in the said intake port, and can provide the other end in the said ventilation port. That is, the first route and the second route may be configured by a shared route with a part on the intake port side or the air blowing port side.

  A humidifier is provided in the third path, and the air taken from the room flows upstream from the humidifier in the third path, and downstream from the humidifier in the third path. Humid air flows. When the third path is humidified with respect to room air, one end can be provided at the intake port and the other end can be provided at the blower port. In the third path, a part on the intake port side or the blower port side may be configured by the first path or the second path and the shared path. Moreover, you may join the end of a 3rd path | route at the downstream of the chlorine dioxide gas decomposition | disassembly apparatus of a 2nd path | route. Thereby, the humidifier can humidify the air in which the chlorine dioxide gas is decomposed by the chlorine dioxide gas decomposer. Therefore, the chlorine dioxide gas decomposed air flows in the third path upstream of the humidifier, and the chlorine dioxide gas is decomposed and humidified downstream of the third path humidifier. Air flows. Thereby, it can prevent that a humidifier is corroded by chlorine dioxide gas.

  Moreover, the chlorine dioxide gas generation device according to the present invention is provided on an upper part of the chlorine dioxide gas generation system, and includes an air outlet for sending the chlorine dioxide gas into the room, and a chlorine dioxide gas generation system below the air outlet. It is good also as a structure which is further provided with the intake port which takes in the said residual gas provided in the lower part, and blows chlorine dioxide gas upwards from the horizontal from the said ventilation port. Thereby, in the upper part of the room, it is possible to form a horizontal air flow from the horizontal direction upward to the chlorine dioxide generation system and in the lower part of the room toward the chlorine dioxide generation system side. As a result, indoor air can be circulated efficiently, and the time required for humidity adjustment, fumigation with chlorine dioxide gas, or decomposition of chlorine dioxide gas can be reduced. The chlorine dioxide gas generation system may be installed in any outdoor room, and the chlorine dioxide gas may be blown upward.

  Further, in the chlorine dioxide gas generation system according to the present invention, the first path and the second path are part of the intake port side for taking in the residual gas or the air outlet side for sending the chlorine dioxide gas into the room. May be configured by a shared route. Further, in the chlorine dioxide gas generation system according to the present invention, the third path is configured such that a part on the intake port side for taking in the residual gas or a part on the blower port side for sending the chlorine dioxide gas into the room is the first path. Alternatively, the second route and the shared route may be used. By making a part of the path a shared path, the space in the chlorine dioxide gas generation system according to the present invention can be expanded, or the chlorine dioxide gas generation system according to the present invention can be made compact. In addition, a chlorine dioxide gas generation system having a part of the path as a common path can reduce the material used and is economically superior.

  In addition, the chlorine dioxide gas generation system according to the present invention is provided in the vicinity of the indoor intake, and a humidity sensor that detects the relative humidity of the indoor air before the operation of the chlorine dioxide gas generator, and the chlorine dioxide It is good also as a structure further equipped with the isolator which isolates the said humidity sensor from the air containing the said chlorine dioxide gas after a gas generator operation | movement.

  By providing the humidity sensor, it is possible to detect the relative humidity of the indoor air before the chlorine dioxide gas generator operates. Moreover, by providing the isolation device, it is possible to suppress deterioration due to contact of the humidity sensor with chlorine dioxide gas.

Further, in the chlorine dioxide gas generation system according to the present invention, the chlorine dioxide gas generator generates chlorine dioxide gas by a chemical reaction between pelleted sodium chlorite and an acidic liquid, and the pelletized sodium chlorite and A container for containing the acidic liquid, a heating device for heating the container, and a filter device for capturing impurities contained in chlorine dioxide gas generated from the container heated by the heating device, The chlorine dioxide gas generation system may further include a fan that sends the chlorine dioxide gas that has passed through the filter device into the room.

  The chlorine dioxide gas generator is not limited to the above configuration, but by adopting the above configuration, contamination by mist and solid particles generated with the generation of chlorine dioxide gas, which has been a concern in the prior art, is avoided. can do.

  The chlorine dioxide gas generation system according to the present invention further includes a humidifier that humidifies the room to a predetermined humidity, and a controller that controls the chlorine dioxide gas generation system, and the controller further includes the humidifier. The chlorine dioxide generator is activated when the room reaches a predetermined humidity, and the chlorine dioxide gas decomposition apparatus is activated when a predetermined time elapses after the room reaches a predetermined chlorine dioxide concentration. Good.

  The above control is an example of control by the control device. When the control device performs the control as described above, the indoor sterilization and sterilization can be performed safely and in a short time.

  Here, the present invention may be specified as the chlorine dioxide gas decomposition apparatus described above. Specifically, the present invention is a chlorine dioxide gas decomposing apparatus that takes in and decomposes a residual gas of chlorine dioxide gas released into the room from a chlorine dioxide gas generating apparatus that generates chlorine dioxide gas. A chlorine dioxide gas decomposing apparatus including a filter medium containing at least one of manganese oxide and permanganate for decomposing a residual gas.

  According to the chlorine dioxide gas decomposition apparatus according to the present invention, chlorine dioxide gas can be decomposed in a shorter time than before. By containing at least one of manganese oxide and permanganate in the filter medium, compared with conventional activated carbon, the decomposition performance of chlorine dioxide gas is further improved and the decomposition time until a safe concentration is reached. It can be made shorter.

  Further, the chlorine dioxide gas decomposition apparatus according to the present invention includes a prefilter provided on the upstream side of the filter medium in the flow of the air taken in, and a downstream side of the filter medium in the flow of the air taken in. It is also possible to further include at least one of an after filter provided on the filter, a fan of a decomposition device that allows the room air to pass through the filter medium, and a rectifying plate provided on the inlet side of the filter medium. Good.

  The prefilter can capture dust and dirt contained in the taken-in air. Further, the after filter can suppress the dust scattering of the filter medium. Moreover, the taken-in air can be reliably passed through the filter medium by the fan of the decomposition apparatus. Moreover, the flow of the air taken in can be made uniform by the current plate, and the trapping performance of the filter medium can be improved.

  Moreover, this invention can also be specified as the indoor fumigation method by the chlorine dioxide gas generation system mentioned above. For example, the fumigation method according to the present invention includes a step of operating the humidifier described above, a step of operating the chlorine dioxide generating device when the room reaches a predetermined humidity, and the room reaching a predetermined chlorine dioxide concentration. And a step of operating the chlorine dioxide gas decomposition apparatus when a predetermined time has elapsed. Note that fumigation includes sterilization, sterilization, and insect killing.

ADVANTAGE OF THE INVENTION According to this invention, the technique which can generate | occur | produce chlorine dioxide gas and can decompose | disassemble chlorine dioxide gas in a shorter time than before can be provided.

FIG. 1: shows the side view of schematic structure of the chlorine dioxide gas generation system which concerns on 1st embodiment. FIG. 2 shows a top view of a schematic configuration of the chlorine dioxide gas generation system according to the first embodiment. FIG. 3: shows the perspective view of schematic structure of the chlorine dioxide gas generator which concerns on 1st embodiment. FIG. 4 shows an exploded perspective view of a schematic configuration of the chlorine dioxide gas generator according to the first embodiment. FIG. 5 shows an example of a container of the chlorine dioxide gas generator according to the first embodiment. FIG. 6: shows the perspective view of schematic structure of the chlorine dioxide gas decomposition | disassembly apparatus based on 1st embodiment. FIG. 7 shows an operation flow of the gas generation system according to the first embodiment. FIG. 8 is a diagram illustrating the flow of humidified air. FIG. 9 is a diagram illustrating the flow of chlorine dioxide gas. FIG. 10 is a diagram illustrating the flow of residual gas processing. FIG. 11 is a diagram illustrating the configuration of the humidity sensor according to the second embodiment. FIG. 12 shows a graph of the relationship between chlorine dioxide gas concentration and elapsed time. FIG. 13 shows a chlorine dioxide gas generation system according to a modification. FIG. 14 shows a schematic configuration of a food powder transport system including a chlorine dioxide gas generator and a chlorine dioxide gas decomposer. FIG. 15 shows an example of a powder transporter. FIG. 16 shows the sterilization processing flow of the food powder transport system in the fourth embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the embodiment described below. For example, in the first embodiment, a sterilization chamber will be described as an example. The chlorine dioxide gas generation system is not limited to sterilization and sterilization of spores, molds, bacteria, and inactivation of viruses, but also small insects such as scallops. It may be used as a technique for killing insects. In this case, the chlorine dioxide gas generation system can sterilize not only the chrysanthemum itself but also the mold that is its food source, so that it is possible to fundamentally prevent the occurrence of the chrysanthemum.

<First embodiment>
<< Configuration of chlorine dioxide gas generation system >>
FIG. 1 shows a side view of a schematic configuration of a chlorine dioxide gas generation system (hereinafter also simply referred to as a gas generation system) 100 according to the first embodiment. FIG. 2 shows a top view of a schematic configuration of the chlorine dioxide gas generation system 100 according to the first embodiment.

A gas generation system 100 according to the first embodiment includes a chlorine dioxide gas generator (hereinafter also simply referred to as a gas generator) 2, a humidifier 3, a fan 4, and a chlorine dioxide gas decomposer in a box-shaped housing 1. (Hereinafter, also simply referred to as a gas decomposition apparatus) 5 and a control device 6 are provided. The gas generation system 100 is provided outside the wall 71 of the sterilization chamber 7 which is a sealed space that needs fumigation disinfection. The gas generation system 100 is provided in the sterilization chamber 7 through an intake port 11 provided at the lower portion of the housing 1. Air is taken in, and chlorine dioxide gas is sent out to the sterilization chamber 7 from an air outlet 12 provided in the upper part of the housing 1. An opening is provided in the wall 71 of the sterilization chamber 7 at a position corresponding to the intake port 11 and the air blowing port 12. Thereby, the sterilization chamber 7 and the gas generation system 100 are communicated with each other through the intake port 11 and the air blowing port 12. When the air taken in from the intake port 11 is classified according to properties, the air in the sterilization chamber 7 before operation of the gas generator 2 (air not including chlorine dioxide gas) and the dioxide dioxide during operation of the gas generator 2 are determined depending on the operation mode. Air containing chlorine gas, air after operation of the gas generator 2 (air containing residual gas), and air humidified by the humidifier 3 are included. The air sent out from the air outlet 12 includes the humidified air (circulated air here) before the gas generator 2 is in operation and the humidifier 3 is in operation, and the chlorine dioxide gas that is in operation of the gas generator 2. Contains air. In addition, you may connect the ventilation port 12 and the intake port 11 with the opening provided in the wall 71 of the sterilization chamber 7, and a duct. Moreover, the gas generation system 100 may be configured to be installed only when it is used, and the opening of the wall 71 may be closed when the gas generation system 100 is removed. For example, if an opening and closing device such as a damper is provided at the opening of the wall 71, when the gas generation system 100 is used, the blower port 12 and the intake port 11 are connected to the opening of the wall 71 to open the damper. When not in use, the gas generation system 100 can be removed from the wall 71 to close the damper. Further, the chlorine dioxide gas generation system 100 may be installed indoors. In this case, the air outlet 12 may be provided on the upper side surface of the gas generation system 100 as described above, or may be provided on the upper surface of the gas generation system 100 so as to blow gas upward.

<< Gas generator >>
Next, the gas generator 2 according to the first embodiment will be described with reference to FIGS. 3 and 4 in addition to FIGS. FIG. 3 is a perspective view of a schematic configuration of the chlorine dioxide gas generator 2 according to the first embodiment. FIG. 4 shows an exploded perspective view of a schematic configuration of the chlorine dioxide gas generator 2 according to the first embodiment. The gas generator 2 includes a base 21, a heater 22, a container 23, a tank 24, a fan filter unit 25, a shield 26, and a heater control device 27.

  The pedestal 21 supports the heater 22 and the container 23. The pedestal 21 according to the first embodiment is a quadrangle and forms the bottom surface of the gas generator 2 that forms a rectangular parallelepiped as a whole. Note that gripping portions 28 for gripping the gas generator 2 are provided on two opposing sides of the base 21.

  The heater 22 is provided at the center of the pedestal 21 and heats the four containers 23 placed thereon. The heater 22 is supplied with electric power from the control device 27 of the gas generator and operates according to an instruction from the control device 27 of the gas generator. The control device 27 of the gas generator includes a power source, a CPU, and a memory, and the CPU executes a control program stored in the memory to control the heater 22. The heater 22 may be controlled by the control device 6 that controls the gas generation system 100 so as to receive power supply from the outside.

The container 23 is charged with pelleted sodium chlorite and supplied with an acidic solution via a tank 24 described later. Note that the pelleted sodium chlorite may be placed in the container 23 in advance, or a device that is put into the container 23 by electronic control may be used. The container 23 is heated, and the pelletized sodium chlorite and the acidic liquid chemically react inside the container 23 to generate chlorine dioxide gas. Here, FIG. 5 shows an example of the container of the chlorine dioxide gas generator according to the first embodiment. In the container 23 shown in FIG. 5, the interior of the container 23 is partitioned into a plurality of rooms 232 by a partition member 231. In FIG. 5, the container 23 includes a central room 232a having a quadrangular top view located at the center and four surrounding rooms 232b positioned around the central room 232a. The partition member 231 is removable from the container 23. Further, the partition member 231 is provided with a plurality of circular through holes 233, and the rooms communicate with each other. The circular through-hole 233 can have a rectangular shape or a slit, but preferably has a size that prevents the pelleted sodium zincate from passing therethrough. The pelletized sodium zincate can be formed into a cylindrical pellet, for example. The pelleted sodium zincate may have other shapes. Pelletized sodium chlorite can be made into any size and shape by mixing sodium chlorite powder with a binder and processing it into pellet tablets or tablet tablets. As the binder, water-soluble polymer compounds such as carboxymethyl cellulose, hydroxyethyl cellulose, and polyethylene glycol can be used. Since pellet-like sodium chlorite is solid, it is easy to store and transport, and there is little fear of roughening the skin even if it adheres to the human body. Prior to the supply of the acidic liquid into the container 23, the pelletized sodium chlorite may be disposed in the container 23 in advance.

  The tank 24 stores an acidic liquid. The stored acidic liquid is supplied to the container 23 through the nozzle 29. For example, an edible organic acid such as malic acid, citric acid, and acetic acid can be used as the acidic liquid. Thereby, compared with the case where acids, such as hydrochloric acid and a sulfuric acid, are used, chlorine dioxide gas can be generated more safely and easily. The acidic liquid may be an edible acidic aqueous solution such as tartaric acid, fumaric acid, succinic acid, gluconic acid, lactic acid, acetic acid, adipic acid, phytic acid, ascorbic acid, or a mixture thereof. In addition, when using acids, such as hydrochloric acid and a sulfuric acid, it is better to use the acidic liquid whose pH is 3 or less, and can generate chlorine dioxide reliably and rapidly.

  The fan filter unit 25 is provided above the container 23, filters the chlorine dioxide gas generated from the container 23, captures particulate matter, and sends out the chlorine dioxide gas. When viewed from the side, the fan filter unit 25 is arranged in the order of a HEPA filter and a built-in fan from the top, and the built-in fan is installed in a blade shape so that an upward airflow is formed.

  The shield 26 surrounds the periphery of the container 23 by combining four rectangular shields (for example, vinyl curtains or the like), and forms an internal space of the gas generator 2 together with the base 21 and the fan filter unit 25. In the lower part of the shield 26 in the three directions, a gap 30 for taking in ambient air into the gas generator 2 is provided. When the built-in fan of the fan filter unit 25 is operated, ambient air is taken in through the gap 30. Since it is necessary to suppress the chlorine dioxide gas and mist generated in the gas generator 2 from leaking from the gap 30, it is necessary to set the speed of taking in air from the gap 30 to a predetermined value or more. For example, the suction speed is preferably 15 cm / s or more, and the air volume of the built-in fan of the fan filter unit 25 and the total area of the gap 30 are preferably set so that such a suction speed can be realized. The path through which the air taken in from the sterilization chamber 7 flows through the inlet 11, the gas generator 2, the fan filter unit 25, and the blower 12 corresponds to the first path of the present invention.

<< Humidifier >>
The humidifier 3 is provided on the back surface of the gas generator 2 and humidifies the air taken from the sterilization chamber 7. Here, the air introduced into the gas generator 2 and the air introduced into the humidifier 2 are partitioned by a partition, and both form respective flow paths. The relative humidity of the sterilization chamber 7 can be obtained from a humidity sensor 9 installed in the vicinity of the intake port 11. The humidifier 3 receives an external power supply and operates according to instructions from the control device 6. The control device 6 includes a CPU and a memory. The CPU executes a control program stored in the memory, and controls the humidifier 3 based on the relative humidity detected by the humidity sensor 9. In addition, you may provide the control apparatus of the humidifier which controls the humidifier 3 separately. The route through which the air taken in from the sterilization chamber 7 flows through the intake port 11, the humidifier 3, and the air blowing port 12 corresponds to the third route of the present invention.

<< Fan >>
The fan 4 is provided above (downstream) the fan filter unit 25 and the humidifier 3, and sends out chlorine dioxide gas or humidified air toward the sterilization chamber 7 in the horizontal direction. The fan 4 receives power supply from the outside and operates according to instructions from the control device 6. The control device 6 includes a CPU and a memory, and the CPU executes a control program stored in the memory to control the fan 4.

<< Gas decomposition equipment >>
Next, the gas decomposition apparatus 5 according to the first embodiment will be described with reference to FIG. 6 in addition to FIGS. FIG. 6 shows a perspective view of a schematic configuration of the chlorine dioxide gas decomposition apparatus according to the first embodiment. The gas decomposing apparatus 5 includes an inlet 52, a rectifying plate 56 formed of a punching plate, a prefilter 53, a main filter 54, an after filter 55, a rectifying plate 56, a gas, and a casing 51 of a box-type gas decomposing apparatus. The decomposer has a fan 58 and an outlet 57 arranged in the order of air flow, and takes in and decomposes the residual chlorine dioxide gas released from the gas generator 2 into the sterilization chamber 7. This inlet 52 to outlet 57 form the second path of the present application.

  The inlet 52 is provided in the vicinity of one corner on the sterilization chamber 7 side of the casing 51 of the gas decomposition apparatus. Here, the inlet 52 is disposed below the gas generator 2 in contact with the upper end, and communicates with the intake port 11. The air in the sterilization chamber 7 is taken in.

  The pre-filter 53 is provided on the most upstream side of the pre-filter 53, the main filter 54, and the after-filter 55 in the flow of the taken-in air, and captures dust and dirt contained in the taken-in air. The prefilter 53 can be constituted by, for example, a so-called gravimetric method having a performance of about 70% collection rate.

  The main filter 54 is provided between the pre-filter 53 and the after-filter 55, in other words, on the downstream side of the pre-filter 53 and on the upstream side of the after-filter 55 in the taken-in air flow. Decompose chlorine dioxide gas (residual gas) contained in the air. In the example shown in FIG. 6, the main filter 54 is a breathable plate-like substrate in which porous powder of activated carbon or zeolite containing manganese oxide powder or permanganate is consolidated into a granular pellet with a binder. Materials fixed on the surface of a material (such as urethane foam) are laminated at different angles, and have a pleated structure in which straight lines are bent repeatedly in a cross-sectional view. The main filter 54 may be a honeycomb filter in which a porous powder of activated carbon or zeolite containing manganese oxide powder or permanganate with a binder is fixed to the gas contact surface of a breathable honeycomb structure.

  The after filter 55 is provided on the most downstream side of the pre-filter 53, the main filter 54, and the after filter 55 in the flow of the air taken in, and suppresses scattering of dust and the like in the main filter 54. When the chlorine dioxide gas decomposing apparatus of the present invention is applied to a clean room specification sterilization chamber, it is desirable to use a high performance filter of HEPA specification or quasi-HEPA specification as the after filter 55. However, when applied to a low cleanliness sterilization room other than a clean room, the after filter 55 can be configured by a so-called colorimetric method having a performance of about 65% collection rate.

  The rectifying plate 56 is provided on the inlet side of the main filter 54 and the outlet side of the after filter 55, and uniformizes the flow of the taken-in air. Thereby, the decomposition | disassembly performance of the chlorine dioxide gas by the main filter 54 improves more. The rectifying plate 56 may be installed only on the inlet 52 side, and the gas decomposition apparatus 5 may have a simpler configuration.

  The outlet 57 is provided on the same plane in the vicinity of the corner opposite to the inlet 52 in plan view, and communicates with a path in which the humidifier 3 is provided. Since the inlet 52 and the outlet are located diagonally, a so-called short circuit is suppressed.

The fan 58 of the gas decomposing apparatus draws the residual gas in the sterilization chamber 7 into the gas decomposing apparatus 5 and passes it through the pre-filter 53, the main filter 54, and the after filter 55. The path through which the air taken in from the sterilization chamber 7 flows through the inlet 52, the gas decomposition apparatus 5, and the outlet 57 corresponds to the second path of the present invention. By providing the fan 58 on the downstream side of the gas decomposing apparatus 5, air in which the chlorine dioxide gas is decomposed flows through the fan 58, so that the fan 58 can be prevented from being corroded by the chlorine dioxide gas.

  In addition to the above, the gas generation system 100 may further include a caster that moves the gas generation system 100 and an inspection door that performs maintenance such as inspection or replacement of each filter.

<< Control device >>
The control device 6 is provided outside the gas generation system 100 and includes an operation panel, a display, a CPU, and a memory. The CPU executes a control program stored in the memory to control the gas generation system 100.

<< Operation of gas generation system >>
Next, the operation of the gas generation system according to the first embodiment will be described. FIG. 7 shows an operation flow of the gas generation system according to the first embodiment. In the following description, a case where a control program corresponding to the operation is stored in the memory of the control device 6 and the CPU executes the control program to control the gas generation system will be described as an example. However, in the gas generation system 100, the CPU may receive an instruction from an administrator of the gas generation system, and may control the gas generation system 100 according to the instruction.

  In step S01, the humidifier 3, the fan filter unit 25, and the fan 4 operate. The operation of each of these devices may be executed by the CPU receiving an instruction from the administrator, or the control device 6 may have a built-in timer and automatically operate each device at a predetermined time. . When each device such as the humidifier 3 operates, the process proceeds to step S02.

  In step S02, when the inside of the sterilization chamber 7 reaches a predetermined relative humidity, the humidifier 3 is stopped and the gas generator 2 is operated. Specifically, the CPU acquires information on the relative humidity in the sterilization chamber 7 and determines whether or not a predetermined relative humidity has been reached. For example, when the relative humidity in the sterilization chamber 7 reaches 55% to 65%, it is determined that the predetermined relative humidity has been reached. When the relative humidity in the sterilization chamber 7 reaches a predetermined relative humidity, the CPU stops the humidifier 3 and operates the gas generator 2. Specifically, the CPU supplies the acidic liquid stored in the tank 24 to the container 23 through the nozzle 29 and operates the heater 22 to heat the container 23. If the gas generator 2 operates, it will progress to step S03.

  In step S03, when the inside of the sterilization chamber 7 reaches a predetermined chlorine dioxide gas concentration, for example, 400 ppm, the gas generator 2 is stopped (that is, the heater 22 of the gas generator 2 is stopped) and left for a predetermined time, for example, 3 hours. The A commercially available chlorine dioxide concentration meter can be used as a method for determining that the room has reached a predetermined chlorine dioxide concentration. In addition, based on the time from the start of the gas generator that has been experimentally determined according to the volume of the chamber to the time when the predetermined concentration is reached, the predetermined chlorine dioxide concentration when the time has elapsed since the gas generator was operated May be determined to have reached.

Next, in step S04, the fan 58 of the disassembly apparatus is operated. Specifically, the CPU operates the fan 58 of the gas decomposition apparatus for a predetermined time. The predetermined time for operating the fan 58 of the gas decomposing device is calculated in advance by calculating the time to reach a safe concentration based on the relationship between the operating time of the fan 58 of the gas decomposing device and the decrease rate of the concentration of chlorine dioxide gas. Can be obtained. An example of the safe concentration is a safe maximum concentration of 0.1 ppm that is allowed by an operator for 8 hours a day as defined by the WHO. For example, according to the gas generation system 100 according to the first embodiment, chlorine dioxide having a concentration of 300 ppm or more can be reduced to 0.1 ppm or less in about 30 minutes. Thus, the operation of the gas generation system is completed. Note that the fan 4 and the fan filter unit 25 can be continuously operated according to the usage state of the sterilization chamber 7.

<< Air flow >>
Next, the air flow will be described. FIG. 8 is a diagram illustrating the flow of humidified air. 8A is a front view of the gas generation system 100, FIG. 8B is a side view of the gas generation system 100, and FIG. 8C is a rear view of the gas generation system 100. 8A is a top view corresponding to FIG. 8A, FIG. 8B is a top view corresponding to FIG. 8B, and FIG. 8C is a top view corresponding to FIG. 8C. It is.

  FIG. 8 shows the state in step S01 described above, and the humidifier 3, the fan filter unit 25, and the fan 4 are operating. Therefore, the air taken in from the sterilization chamber 7 flows through the intake port 11, the non-operating gas generator 2, the fan filter unit 25, the air outlet 12, the intake port 11, and the humidifier 3. The third path flowing through the air blowing port 12 is circulated. In the first path, when the built-in fan of the fan filter unit 25 is operated, ambient air is taken in through the gap 30 formed in three directions, and the air from the sterilization chamber 7 passes through the first path. The air passing through the first path passes through the fan filter unit 25 so that impurities are captured. In addition, the air passing through the third path shares the air intake passage with the outside of the gas generator 2 in the first path and is humidified by the humidifier 3, so that the relative humidity in the sterilization chamber 7 gradually increases. Rise.

  FIG. 9 is a diagram illustrating the flow of chlorine dioxide gas. 9A is a front view of the gas generation system 100, FIG. 9B is a side view of the gas generation system 100, and FIG. 9C is a rear view of the gas generation system 100. 9A is a top view corresponding to FIG. 9A, FIG. 9B is a top view corresponding to FIG. 9B, and FIG. 9C is a top view corresponding to FIG. 9C. It is.

  FIG. 9 shows the state in step S02 described above. In addition to the fan filter unit 25 and the fan 4, the gas generator 2 is operating. Similar to the example of FIG. 8, the air taken from the inside of the sterilization chamber 7 circulates through the first path and the third path. However, since the gas generator 2 is operating, the chlorine dioxide gas generated by the gas generator 2 passes through the first path. The fan filter unit 25 also captures impurities contained in the chlorine dioxide gas. Moreover, since the humidifier 3 is stopped, the air passing through the third path simply passes through the third path without being humidified.

  FIG. 10 is a diagram illustrating the flow of residual gas processing. 10A is a front view of the gas generation system 100, FIG. 10B is a side view of the gas generation system 100, and FIG. 10C is a rear view of the gas generation system 100. 10 (a) is a top view corresponding to FIG. 10 (A), FIG. 10 (b) is a top view corresponding to FIG. 10 (B), and FIG. 10 (c) is a top view corresponding to FIG. 10 (C). It is.

  FIG. 10 shows the state in step S04 described above. In addition to the fan filter unit 25 and the fan 4, the fan 58 of the gas decomposition apparatus is operating. Therefore, the air taken in from the sterilization chamber 7 communicated with the first path, the intake port 11, the inlet 52 communicating with the inlet side of the first path, the gas decomposition apparatus 5, and the vicinity of the inlet of the third path. It circulates through the second path flowing through the outlet 57. However, since the gas generator 2 is not operating, the air passing through the first path is trapped with impurities by passing through the fan filter unit 25 without being given a new chemical substance. Further, the air passing through the second path passes through the gas decomposition apparatus 5, whereby the residual gas is decomposed.

<< Effect >>
As described above, the chlorine dioxide gas generation system 100 according to the first embodiment described above includes the gas generation device 2, so that sterilization and sterilization are further performed as compared with other chlorine, sodium hypochlorite, and hydrogen peroxide. It can be implemented safely. Further, since chlorine dioxide gas does not have a strong odor like chlorine, it can reduce the unpleasant odor when performing sterilization and sterilization. Furthermore, chlorine dioxide gas has a high bactericidal power per unit weight, exhibits excellent sterilization and bactericidal effects against spores, fungi, bacteria, viruses and the like, and does not produce carcinogenic substances. Moreover, the gas generation system 100 which concerns on 1st embodiment can decompose | disassemble chlorine dioxide gas in a shorter time than before by providing the gas decomposition apparatus 5. FIG. Using a filter medium containing activated carbon or zeolite porous powder containing manganese oxide powder or permanganate as the main filter 54, the decomposition performance of chlorine dioxide gas is further improved compared to conventional activated carbon In addition, the decomposition time until a safe concentration is reached can be further shortened.

<Second embodiment>
FIG. 11 is a diagram illustrating the configuration of the humidity sensor 9 according to the second embodiment. In the second embodiment, the humidity sensor 9 is provided in the sampling tube 91, and the sampling tube is configured to be openable and closable by an electromagnetic valve 92 provided in the sampling tube 91. The sampling tube 91 and the electromagnetic valve 92 correspond to the isolation device of the present invention. The humidity sensor 9 is connected to the control device 6 via a cable. The humidity sensor 9 may be connected to a temperature sensor display logger. A suction pump 93 is connected to the proximal end of the sampling tube 91 so that air in the sterilization chamber 7 can be sucked into the sampling tube 91. The exhaust from the suction pump 93 is configured to be discharged to the sterilization chamber 7. In addition, by electrically connecting the electromagnetic valve 92 and the suction pump 93 to the control device 6, these can be controlled by the control device 6.

  Next, the operation of the humidity sensor 9 will be described. First, the electromagnetic valve 92 is opened until the gas generator 2 is operated, and the suction pump 93 is operated. Thereby, the air in the sterilization chamber 7 is sucked into the sampling tube 91. The wind speed around the humidity sensor 9 is determined by the flow rate of air at the time of suction. In order to improve the accuracy of the humidity sensor 9, the wind speed is preferably suitable for the humidity sensor 9. For example, the wind speed is preferably a slight wind speed of 10 cm / s to 20 cm / s.

  Next, immediately before the gas generator 2 is operated, the electromagnetic valve 92 is closed. Thereby, even if chlorine dioxide gas is subsequently generated by the gas generator 2, the chlorine dioxide gas and the humidity sensor 9 are not in direct contact with each other.

  Next, information on the relative humidity detected by the humidity sensor 9 is input to the control device 6 immediately before the electromagnetic valve 92 is closed.

  According to the gas generation system 100 according to the second embodiment, in addition to the effects of the gas generation system 100 according to the first embodiment, the humidity sensor 9 and the chlorine dioxide gas are provided by including the sampling tube 91 and the electromagnetic valve 92. It is possible to suppress the deterioration of the humidity sensor 9 due to the contact.

<Third embodiment>
The operation in step S03 may be performed as follows. Specifically, the CPU may operate the heater 22 after a predetermined time has elapsed after the nozzle 29 is opened and the acidic liquid stored in the tank 24 is supplied to the container 23. The predetermined time can be determined according to the shape and size of sodium chlorite. For example, when the pelletized sodium chlorite is reacted with the acidic liquid, the predetermined time can be about 10 minutes.

For example, when the room temperature of the sterilization chamber 7 is in the range of 20 ° C. to 30 ° C., half of the peak value is reached before the concentration of chlorine dioxide gas after mixing with the powdered sodium chlorite that has not been pelletized and the acidic liquid for several minutes. Reaching about 200 ppm. On the other hand, in the reaction between pelleted sodium chlorite and acidic liquid, at a room temperature, the concentration is safe for managers and workers up to about 10 minutes after mixing (for example, safety guidelines for temporary short-term exposure to WHO for 15 minutes 300 ppb = 0.3 ppm) or less. However, when heated for 2 to 3 minutes, it was confirmed that the concentration exceeded the safe concentration (see FIG. 12). Therefore, after the acidic liquid is added, for example, heating is performed after 5 minutes or more has elapsed, so that the evacuation time of the manager or the worker can be given a margin. In addition, by heating after 10 minutes or more after the acidic liquid is charged, the concentration is less than the safe concentration up to about 10 minutes as shown in FIG. 12, and the retreat time can be more sufficiently secured.

  As described above, safety can be further improved by controlling the operation timing of the heater 22.

<Modification>
In the first embodiment, the first path, the second path, and the third path are all accommodated in the gas generation system 100. However, as shown in FIG. May be constituted by ducts provided on the outside (the duct 81 on the upstream side of the gas decomposition apparatus 5, the duct 82 on the downstream side of the gas decomposition apparatus 5), and the fan 58 of the decomposition apparatus may be disposed in the duct (for example, It may be provided in the duct 82 on the downstream side of the gas decomposition apparatus 5. Thereby, since the space in the gas decomposition apparatus 5 can be ensured more largely, the main filter 54 can be enlarged and the decomposition performance of chlorine dioxide gas by the gas decomposition apparatus 5 can be improved.

  Further, the chlorine dioxide generation system 100 is not limited to a mode of circulating indoor air, but outdoor air such as outdoor air may flow into the all-outdoor type, for example, the chlorine dioxide gas generator 2, not only indoor air. For example, the gas decomposition apparatus 5 may be installed in a ceiling portion, take in indoor chlorine dioxide gas, decompose, and then discharge to the outside. Moreover, it is good also as a structure into which the air which flows in into a humidifier flows in from the outdoor.

<Fourth embodiment>
4th embodiment demonstrates the case where the gas generator 2 and the gas decomposition apparatus 5 are applied to the sterilization of the powder transportation system 200 for foodstuffs. FIG. 14 shows a schematic configuration of a food powder transport system 200 including the chlorine dioxide gas generator 2 and the chlorine dioxide gas decomposer 5. In addition, about the structure similar to embodiment already demonstrated, the same code | symbol is attached | subjected and description is omitted.

  The food powder transport system 200 includes three powder transporters 201 (collecting three powder transporters 201, hereinafter also referred to as a suction loader group). The pipes 202 are connected in series. The powder for food (hereinafter also simply referred to as powder) in the fourth embodiment is a mixed powder, and three powder transporters 201 are connected in series so that powders having different particle sizes and densities are not separated. It is connected. Each powder transporter 201 is connected to a supply pipe 217 that guides powder to an apparatus (not shown) for process processing (for example, food production). Therefore, a part of the powder in the powder transport machine 201 is sent to a process processing apparatus (for example, a specific food production apparatus) via the supply pipe 217, and the rest is downstream via the transport pipe 202. To the side powder transport machine 201. Process processing apparatuses include a food manufacturing apparatus that manufactures a specific food and an apparatus that constitutes a powder transport machine 201 that transports powder.

The powder transportation system for food 200 includes a branch pipe 203 branched from the transport pipe 202. The branch pipe 203 is a piping system used at the time of sterilization and sterilization described later, and is provided in the middle of an inlet and an outlet of a pipe line where a suction loader group which is one of process processing apparatuses is installed. More specifically, the branch pipe 203 has one end connected to the vicinity of the powder transport inlet 204 of the food powder transport system 200 and the other end to the vicinity of the powder transport outlet 205 of the food powder transport system 200. It is connected. The branch pipe 203 is provided with valves 206 and 207. When the valve 208 near the powder transport inlet 204 and the valve 209 near the powder transport outlet 205 are closed, and the valves 206 and 207 provided on the branch pipe 203 are open, the powder One closed space is formed by the branch pipe 203 from the downstream side of the valve 208 in the vicinity of the transport inlet 204 to the valve 209 in the vicinity of the powder transport outlet 205. This closed space corresponds to a “chamber” of the present invention. In the fourth embodiment, the gas generator 2 and the gas decomposition device 5 are installed in the branch pipe 203 in order to execute sterilization in the closed space. ing.

  FIG. 15 shows an example of a powder transporter. The powder transport machine 201 includes a blower 210, a loader body 211, a filter 212, a damper 213, and an air tank 214. The blower 210 is connected to the loader main body 211 via the suction pipe 215, sucks the air in the loader main body 211 and the transport pipe 202 connected to the loader main body 211, and sucks the powder through the transport pipe 202. The loader body 211 stores the sucked powder. The damper 213 is a weight-type discharge damper, and is opened when a certain amount of powder is stored in the loader body 211 and suction of the blower 210 is stopped. The damper 213 is in a closed state when the powder is not stored in the loader body 211 for a certain amount and the blower 210 is sucking. The filter 212 is provided in the loader body 211, blocks the powder, and allows only air to pass through. The inside of the air tank 214 is at a high pressure, and when a valve (not shown) is opened, air is injected from the open end of the pipe 216 arranged upward just below the filter 212. One end of a pipe 216 is connected to the air tank 214. The other end (open end) of the pipe 216 is disposed so as to face the inside of the filter 212.

  The powder transport machine control device 215 includes a power source, a CPU, and a memory, and the CPU executes a control program stored in the memory to control the powder transport machine 201. Specifically, the control device 215 of the powder transport machine controls valves (not shown) of the blower 210 and the air tank 214. The function of the control device 215 of the powder transport machine may be executed by the control device 6 that controls the gas generation system.

  When the blower 210 is operated, powder is sucked through the transport pipe 202 connected in the vicinity of the filter 212, and the sucked powder contacts the filter 212 and is stored in the loader body 211. When the powder in the loader body 211 is stored above a certain level and the blower 210 is stopped, the damper 213 is opened by the gravity of the powder, and the powder falls. Part of the powder dropped from below the damper 213 of each powder transporter 201 is sent to each process processing apparatus (for example, a specific food production apparatus) via the supply pipe 217, and the rest is more The air is sucked by the blower 210 of the powder transport machine 201 installed on the downstream side and sent to the downstream powder transport machine 201 through the transport pipe 202. When air is jetted from the air tank 214 when the blower 210 is stopped, the air jetted through the pipe 216 is discharged from the inside of the filter 212, and the powder adhering to the filter 212 falls and is removed.

  In the above example, the blower 210 is intermittently operated. However, the blower 210 may be continuously operated by using a rotary valve in place of the weight discharge damper 213. In addition, although the powder transport machine 201 shown in FIG. 15 sucks and transports powder using the blower 210, the powder transport machine 201 may transport and transport powder using a compressor.

  The gas generator 2 generates chlorine dioxide gas. The gas decomposition apparatus 5 takes in the residual gas of chlorine dioxide gas released from the gas generation apparatus 2 into the closed space and decomposes it. The control device 6 includes a power supply, a CPU, and a memory, and the CPU executes a control program stored in the memory to control the gas generation device 2 and the gas decomposition device 5. The gas generator 2 may be controlled by a control device of the gas generator that controls the gas generator (corresponding to the control device 27 of the gas generator of FIG. 4).

  The gas generator 2 and the gas decomposition apparatus 5 operate when the food powder transport system 200 is sterilized. In other words, when the powder transportation system for food 200 performs powder transportation, the valve 208 near the powder transportation inlet 204 and the valve 209 near the powder transportation outlet 205 are opened, and the branch pipe 203 is opened. The provided valves 206 and 207 are closed, and the gas generator 2 and the gas decomposition apparatus 5 are stopped. When each blower 210 operates in this state, the powder is sucked and transported from the powder transport inlet 204 to the powder transport outlet 205 through the food powder transport system 200.

  Next, the sterilization process of the food powder transportation system 200 according to the fourth embodiment will be described. FIG. 16 shows the sterilization processing flow of the food powder transport system in the fourth embodiment. In step S11, the valve 208 in the vicinity of the powder transport inlet 204 and the valve 209 in the vicinity of the powder transport outlet 205 are closed, and the valves 206 and 207 provided in the branch pipe 203 are opened. Each valve may be opened and closed by an administrator, or each valve may be an electromagnetic valve and controlled by the control device 6. When the opening / closing of each valve is completed, the process proceeds to step S12.

  In step S12, a sterilization process is executed. One closed space is formed by the branch pipe 203 from the downstream side of the valve 208 in the vicinity of the powder transport inlet 204 to the valve 209 in the vicinity of the powder transport outlet 205, and the gas generator 2 operates in the closed space. To do. Next, when the inside of the closed space reaches a predetermined chlorine dioxide gas concentration (for example, 400 ppm), the gas generator 2 is stopped and left for a predetermined time, for example, 3 hours. Next, the fan 58 of the decomposition apparatus is operated for a predetermined time (for example, 30 minutes), from the downstream side of the valve 208 near the powder transport inlet 204 to the valve 209 near the powder transport outlet 205, and the branch pipe. In 203, gas circulates in one closed space. Thus, the sterilization process is completed. Note that the predetermined chlorine dioxide gas concentration, the standing time, and the operating time of the fan 58 of the decomposition apparatus can be changed depending on the equipment to be sterilized. For example, when there are many bacteria in the closed space, the predetermined chlorine dioxide gas concentration may be increased, while the standing time may be shortened. In determining the predetermined chlorine dioxide gas concentration, standing time, and operating time of the fan 58 of the decomposition apparatus, a sampling pipe is installed in a part of the closed space (for example, the transport pipe 202), and the state of the bacteria is confirmed in advance. It is preferable to keep it. When the sterilization process is completed, the process proceeds to step S13.

  In step S13, the valve 208 in the vicinity of the powder transport inlet 204 and the valve 209 in the vicinity of the powder transport outlet 205 are opened, and the valves 206 and 207 provided in the branch pipe 203 are closed. Each valve may be opened and closed by an administrator, or each valve may be an electromagnetic valve and controlled by the control device 6. When opening and closing of each valve is completed, powder transportation is resumed.

  In the food powder transportation system 200 according to the fourth embodiment described above, the gas generator 2 is provided, so that sterilization and sterilization can be further performed as compared with other chlorine, sodium hypochlorite, and hydrogen peroxide. It can be implemented safely. Moreover, by providing the gas decomposition | disassembly apparatus 5, chlorine dioxide gas can be decomposed | disassembled in a shorter time than before. Compared with conventional activated carbon, chlorine dioxide gas can be decomposed by using a filter medium containing activated carbon or zeolite porous powder containing manganese oxide powder or permanganate in the main filter of the gas decomposition apparatus 5. The performance can be further improved, and the decomposition time until reaching a safe concentration can be shortened. Further, in the food powder transport system 200 for transporting food powder, there is a concern about the occurrence of mold in the transport pipe 202 and the attachment of odor to the transport pipe 202. However, the food powder transport system 200 according to the fourth embodiment includes the gas generation device 2 and the gas decomposition device 5 so as to suppress the generation of mold and remove the attached odor.

In addition, you may make it provide the humidifier further in the powder transportation system 200 for foodstuffs concerning 4th embodiment. Moreover, you may connect the gas generation system 100 which concerns on 1st embodiment to the powder transportation system 200 for foodstuffs which concerns on 4th embodiment.

  The preferred embodiments of the present invention have been described above. However, the gas generation system, the gas generation apparatus, and the gas decomposition apparatus according to the present invention are not limited to these, and can include combinations thereof as much as possible. Further, the gas generation system, the gas generation apparatus, and the gas decomposition apparatus according to the present invention can be used in various fields other than the embodiment described above. For example, a harmful substance exhaust apparatus such as a so-called draft chamber or safety cabinet may be connected to a gas generator and a gas decomposition apparatus so that the harmful substance exhaust apparatus is sterilized or sterilized. For example, the air intake door of the harmful substance exhaust device is semi-closed to generate chlorine dioxide gas in the hazardous substance exhaust device, and a predetermined time elapses after the air intake door is closed. Next, after a predetermined time has elapsed, the air intake door is placed in a semi-closed state, and chlorine dioxide gas is taken in and decomposed by the gas decomposition apparatus 5.

  Moreover, the gas generator 2 and the gas decomposition apparatus 5 can be provided in the middle of piping or a duct. In the case of pipes, sterilization and deodorization are performed in a space closed by a valve and a valve (one section of piping), and in the case of a duct, a space closed by a damper and a damper (one section of a duct). Processing can be performed. For example, in the example shown in FIG. 14, the valves 206 and 207 are closed and the gas generator 2 and the gas decomposition device 5 are operated, so that the sterilization in the branch pipe 206 between the valve 206 and the valve 207 is performed. Treatment and deodorization treatment can be performed. A pipe or duct is usually provided with a valve or duct. Therefore, the sterilization process and the deodorization process in the pipe between the valves and in the duct between the damper and the damper can be performed. The sterilization treatment may be performed on one section of the pipe or duct, or may be sequentially performed from one end to the other end of the pipe or duct. As described above, since valves and ducts are usually provided in pipes and ducts, the gas generator 2 and the gas decomposition apparatus 5 can be easily installed in existing pipes and ducts, or facilities including these. Can be applied. As described above, the gas generation system, the gas generation apparatus, and the gas decomposition apparatus according to the present invention can be widely used as a technique for sterilizing and sterilizing a closed space.

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Chlorine dioxide gas generator 3 ... Humidifier 4 ... Fan 5 ... Chlorine dioxide gas decomposition device 6 ... Control device 7 ... Sterilization chamber 52 ... -Inlet 53 ... Pre-filter 54 ... Main filter 55 ... After filter 56 ... Rectifying plate 57 ... Outlet 11 ... Intake port 12 ... Blower port 100 ... Chlorine dioxide Gas generation system

Claims (11)

A chlorine dioxide gas generator for generating chlorine dioxide gas;
A chlorine dioxide gas decomposition apparatus that takes in and decomposes the residual gas of chlorine dioxide gas released into the room from the chlorine dioxide gas generator,
The chlorine dioxide gas decomposition apparatus is a chlorine dioxide gas generation system including a filter medium containing at least one of manganese oxide and permanganate.   The chlorine dioxide gas generation system according to claim 1, further comprising a humidifier that humidifies the room to a predetermined humidity. A first path through which the air taken in from the room passes and the chlorine dioxide gas generator is provided;
A second path through which the chlorine dioxide gas decomposing device is provided and the air decomposed by the chlorine dioxide gas decomposing device flows;
The chlorine dioxide gas generation system according to claim 2, further comprising: a third path provided with the humidifier and through which air humidified by the humidifier flows. An air outlet provided at the top of the chlorine dioxide gas generation system, for sending the chlorine dioxide gas into the room;
The chlorine dioxide gas generation system according to any one of claims 1 to 3, further comprising an intake port provided at a lower portion of the chlorine dioxide gas generation system below the blower port and taking in the residual gas. .   The said 1st path | route and said 2nd path | route are comprised in the intake port side which takes in the said residual gas, or a part of the ventilation port side which sends out the said chlorine dioxide gas in the said room | chamber interior by a shared path | route. Chlorine dioxide gas generation system.   In the third path, a part of the intake port side for taking in the residual gas or the blower port side for sending out the chlorine dioxide gas into the room is constituted by the first path or the second path and a shared path, The chlorine dioxide gas generation system according to claim 3. A humidity sensor that is provided in the vicinity of the indoor intake and detects the relative humidity of the air in the room before the chlorine dioxide gas generator operates.
The chlorine dioxide gas generation system according to any one of claims 4 to 6, further comprising an isolation device that isolates the humidity sensor from the air containing the chlorine dioxide gas after the chlorine dioxide gas generation device is operated. The chlorine dioxide gas generator generates chlorine dioxide gas by a chemical reaction between pelleted sodium chlorite and an acidic liquid,
A container containing the pelletized sodium chlorite and the acidic liquid;
A heating device for heating the container;
A filter device for capturing impurities contained in chlorine dioxide gas generated from the container heated by the heating device;
The chlorine dioxide gas generation system according to any one of claims 1 to 7, further comprising a fan that sends the chlorine dioxide gas that has passed through the filter device into the room. A humidifier for humidifying the room to a predetermined humidity;
A control device for controlling the chlorine dioxide gas generation system,
The control device operates the humidifier, operates the chlorine dioxide generator when the room reaches a predetermined humidity, and decomposes the chlorine dioxide gas when the room reaches a predetermined chlorine dioxide concentration and a predetermined time elapses. The chlorine dioxide gas generation system according to any one of claims 1 to 8, wherein the apparatus is operated. A chlorine dioxide gas decomposition apparatus that takes in and decomposes the residual gas of chlorine dioxide gas released into the room from a chlorine dioxide gas generator that generates chlorine dioxide gas,
A chlorine dioxide gas decomposition apparatus including a filter medium containing at least one of manganese oxide and permanganate, which takes in and decomposes the residual gas. In the flow of air taken in, a prefilter provided on the upstream side of the filter medium;
In the flow of the air taken in, an after filter provided on the downstream side of the filter medium;
A fan of a decomposing apparatus that allows the room air to pass through the filter medium;
The chlorine dioxide gas decomposing apparatus according to claim 10, further comprising at least one of a rectifying plate provided on an inlet side of the filter medium.

Images