JP2016179938A - Chlorine dioxide gas generator, container, and utilization method of chlorine dioxide gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chlorine dioxide gas generator, a container and a utilization method of chlorine dioxide gas, allowing for avoidance of contamination due to mist or solid particles generated accompanying creation of chlorine dioxide gas.SOLUTION: A chlorine dioxide gas generator 1 is provided that supplies pellet-like sodium chlorite a and acid liquid b to a container 13, and generates chlorine dioxide gas c by chemical reaction between the sodium chlorite a and the acid liquid b. The chlorine dioxide gas generator 1 comprises a container 13 in a space 11 surrounded by a shielding body 10, the container 13 is partitioned into a plurality of container portions 20, and each container portion 20 communicates with each other with openings 22 having size at which pellet-like sodium chlorite a cannot pass through the opening. Any one of deodorization in a room, disinfection, and sterilization of microorganism is performed by utilizing chlorine dioxide gas c generated by the chlorine dioxide gas generator 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chlorine dioxide gas generator, a container, and a method for using chlorine dioxide gas, which are used for deodorizing indoors such as clean rooms, hospitals, and hotel rooms, sterilizing microorganisms, and sterilizing.

The method of sterilizing and sterilizing microorganisms using chlorine dioxide gas is less toxic and safer than other methods using chlorine, sodium hypochlorite, hydrogen peroxide, etc. There is an advantage that there is no discomfort because there is no strong smell like chlorine. In addition, chlorine dioxide gas has a high sterilizing power per unit weight, has an excellent sterilizing and sterilizing effect against spores, fungi, bacteria, viruses and the like, and has an advantage of not producing carcinogenic substances. When chlorine dioxide gas comes into contact with proteins of microbial cells, O ₂ is separated and oxidized, and at the same time, it reacts with sodium contained in microorganisms to become NaCl. Chlorine dioxide gas reacts quickly when it comes into contact with proteins.
ClO ₂ + microbial Na → oxidized microbial protein + NaCl

On the other hand, chlorine dioxide gas is unstable and 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 according to the following reaction formula.
4NaClO ₂ + 2HOOC-CH (OH) -CH ₂ -COOH + O ₂ → 2NaOOC-CH (OH) -CH ₂ -COONa + 4ClO ₂ + 2H ₂ O

  The present applicant has previously disclosed a method of generating chlorine dioxide gas by reacting a powder of sodium chlorite with an acidic liquid in Patent Documents 1 and 2. In addition, when the chemical reaction of sodium chlorite and an acidic liquid advances rapidly, there exists a possibility of producing an explosion. Therefore, in the technique shown in Patent Document 1, the concentration of sodium chlorite supplied into the container is limited to 10 g or less to prevent a local concentration increase. Moreover, in the technique shown in Patent Document 2, in addition to preventing the local concentration of chlorine dioxide gas from exceeding 10%, the reaction is accelerated by heating from outside the container, and the reaction is completed within a predetermined time. I try to let them.

JP 2009-234877 A JP 2010-207539 A

However, when the bubble of chlorine dioxide gas (ClO ₂ ) generated in the liquid in the container rises up to the liquid level, the fine mist scatters and the mist thus scattered floats in the room and becomes contaminated. is there. In addition, when the fine mist that scatters floats and dries, it becomes solid particles of the reaction product NaOOC—CH (OH) —CH ₂ —COONa. NaOOC-CH-CH (OH) -CH2-COONa is a soluble residue that remains after the reaction of sodium chlorite with an acidic liquid to release chlorine dioxide gas, and is not a gaseous substance. NaOOC—CH—CH (OH) —CH 2 —COONa remains dissolved in the solution after the generation of chlorine dioxide gas, but remains as a white powdered salt when the water has completely evaporated. When the mist and solid particles floating in the room adhere to products and devices arranged in a clean room or the like, quality causes.

  For example, in disinfection / sterilization in a clean room of a pharmaceutical factory, it is only necessary to disinfect / sterilize microorganisms as the source of contamination with chlorine dioxide gas. If they are not separated and removed, they may adhere to precision equipment in the pharmaceutical manufacturing process and cause corrosion, and may lead to product contamination and defects. Therefore, these accompanying contaminants must be thoroughly eliminated.

  The present invention has been made in view of the above points, and provides a chlorine dioxide gas generator, a container, and a method of using chlorine dioxide gas that can avoid contamination by mist and solid particles generated along with the generation of chlorine dioxide gas. It is to provide.

  According to the present invention, a chlorine dioxide gas generator that supplies pellet-like sodium chlorite and an acidic liquid to a container and generates chlorine dioxide gas by a chemical reaction between the two, and in a space surrounded by a shield The container is divided into a plurality of container parts, and each container part communicates with each other through an opening having a size that prevents passage of pelleted sodium chlorite. A chlorine dioxide gas generator is provided.

The chlorine dioxide gas generator may include a partition member that divides the interior of the container into a plurality of container parts, and the partition member may be removable from the container. Moreover, you may provide the heater which heats the acidic liquid supplied to the said container.
Further, according to the present invention, in the chlorine dioxide gas generator, pelletized sodium chlorite and an acidic liquid are supplied, and a chlorine dioxide gas is generated by a chemical reaction between the two, and a plurality of container parts are provided. A container is provided, characterized in that it is partitioned and each container part communicates with each other through an opening having a size through which pellet-like sodium chlorite cannot pass.
According to the present invention, the use of chlorine dioxide gas is characterized in that any one of indoor deodorization, sterilization of microorganisms, and sterilization is performed using chlorine dioxide gas generated by the chlorine dioxide gas generator. A method is provided.

  In the present invention, as an acidic liquid, for example, an edible organic acid such as malic acid, citric acid or acetic acid is used, so that it is safer and easier than handling an acid such as hydrochloric acid or sulfuric acid which is toxic to the human body. It is possible to generate chlorine dioxide gas. Moreover, 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, pelletized sodium chlorite can be placed in the container in advance.

According to the present invention, by reacting pelletized sodium chlorite with an acidic liquid in a container, chlorine dioxide gas (ClO ₂ ) is generated on-site and supplied into a room such as a clean room to remove deodorization and microorganisms. It can be used for sterilization and sterilization. When generating chlorine dioxide gas, the container into which the pelleted sodium chlorite is charged is divided into a plurality of container parts, and by reacting the pelletized sodium chlorite and the acidic liquid in each container part, Chlorine dioxide gas can be generated from the whole and supplied to the room. Moreover, since each container part is mutually connected with the opening part of the magnitude | size which cannot pass pellet-like sodium chlorite, acidic liquid is supplied uniformly to each container part, while pellet-like sodium chlorite Does not move to another container part, and the reaction between the pelletized sodium chlorite and the acidic liquid is performed in a state where there is no bias in each container part. Moreover, the reaction amount of sodium chlorite in each container part is the same as the initially set amount assumed for each container part, and the surrounding scatter and liquid spillage due to mist are not caused. As a result, chlorine dioxide gas can be generated uniformly from the entire container, and the reaction efficiency is improved. In addition, by generating chlorine dioxide gas from the entire container, the amount of components that are effective for deodorization, sterilization, sterilization, and the like can be improved per area, so that the apparatus can be miniaturized.

It is the schematic of the chlorine dioxide gas generator concerning embodiment of this invention. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is a perspective view of a container. It is a side view of a partition member. It is a perspective view of pellet-like sodium chlorite. It is explanatory drawing of the modification of a container. It is a graph which shows the relationship between the elapsed time in this invention example, and a particle | grain density | concentration (vertical axis 0-4000count / m < ³ >). It is a graph which shows the relationship between the elapsed time in this invention example, and a particle | grain density | concentration (vertical axis 0-20count / m < ³ >). It is a graph which shows the relationship of the elapsed time and particle concentration in a comparative example (vertical axis 0-4 million count / m < ³ >). It is a graph which shows the relationship of the elapsed time and particle concentration in a comparative example (vertical axis 0-400000 count / m < ³ >). It is a graph which shows the relationship between sedimentation speed and specific gravity of object particle.

  Embodiments of the present invention will be described below. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

First, as described above, conventionally, the amount of sodium chlorite powder to be charged must be 10 g or less. The reason for this is that when gas is generated by mixing sodium chlorite powder and an acidic solution, if the chlorine dioxide gas concentration on the liquid surface exceeds 10 vol%, a non-flammable explosion (the liquid mixture is scattered around). In References 1 and 2, it was clarified that the risk increases with an input amount of 20 g or more. In addition, the safety factor was also set to 10 g or less. One of the inventors then continued research and examined the relationship between the bottom area and the explosion in more detail based on the bottom area of a commercially available 180 cc capacity paper cup (5 cm diameter circle ≈ 20 cm ² ). As a result, in a cylindrical container with a bottom area of 20 cm ² , sodium chlorite powder and malic acid powder twice the weight of sodium chlorite powder in purified water of 5 times the weight of sodium chlorite powder. The dissolved malic acid solution was reacted to repeatedly generate chlorine dioxide gas in a stationary space where no air flow was present. When the amount of sodium chlorite powder input was increased between 10g and 20g, the degree of contamination due to mist splashing and adhering to the surroundings of the container increased, and if it exceeded 20g, contamination such as spilling of the liquid itself It was observed. In other words, even if it does not lead to ambient contamination by the reaction solution itself (which may be referred to as non-flammable explosion), contamination by mist, which can be said to be a precursor, causes sodium chlorite powder weight to exceed 10 g per 20 cm ² bottom area. It started to arise from the stage. In order to prevent this mist contamination, the amount of sodium chlorite powder input per 20 cm ² bottom area must be 10 g or less. In addition, as a result of repeated similar measurements of the bottom area in half of 10 cm ^2, contamination by mist, sodium chlorite powder weight began to form from step exceeding 10 cm ² bottom area per 5g. That is, the ratio of powder to liquid in some parts is increased, since the scattering of boiling over or mist of the liquid itself occurs, sodium chlorite powder weight input amount to prevent this be below 0.5 g / cm ² I must.

  Therefore, the inventors reduced the size of the apparatus and reduced the installation area without increasing the number of chlorine dioxide gas generating containers. If the device is downsized and the installation area is reduced, the effective area of the room that needs to be decontaminated can be increased.For example, if it is installed in a clean room, more devices can be installed. Dyeing ability can be improved. In addition, in order to reduce the size of the equipment and reduce the installation area, we devised measures to prevent mist from surrounding air pollution.

  As shown in FIGS. 1 to 3, the chlorine dioxide gas generator 1 according to the embodiment of the present invention includes a container 13 on a heater 12 in a space 11 formed by being surrounded by a shield 10 on all sides. Is provided. The shielding body 10 is attached to the support | pillar 15 arrange | positioned at four corners.

A fan filter unit 16 is attached above the space 11 surrounded by the shield 10. The fan filter unit 16 includes a HEPA filter and a built-in fan that sucks air in the space 11 and passes it through the HEPA filter. The size of the fan filter unit 16 is, for example, an outer dimension of 610 W × 610 L × 140 H, and has a suction capacity of 5 m ³ / min, 22 cm / s.

  For the shield 10, for example, a hem opening transparent vinyl curtain can be used. Below the shield 10, a gap 17 is formed in the space 11 for taking in ambient air. The gap 17 is an opening having a height of, for example, 14 cm formed on the floor surface. Due to the operation of the internal fan of the fan filter unit 16, the air around the chlorine dioxide gas generator 1 is sucked into the space 11 through the gaps 17. Then, the air flows upward in the space 11, is sucked into the fan filter unit 16, and the air filtered by the HEPA filter of the fan filter unit 16 is diffused and circulated in the room, and then again the chlorine dioxide gas generator. 1 is supplied.

  As shown in FIGS. 2 and 3, in this embodiment, four containers 13 are placed on the heater 12. Each container 13 is supplied with pellet-shaped sodium chlorite a and acidic liquid b, which will be described later.

  As shown in FIG. 4, each container 13 is provided with a partition member 21 for partitioning the inside of the container 13 into a plurality of container portions 20. In this embodiment, the interior of each container 13 is divided into a total of five container parts 20, one central container part 20 and four container parts 20 positioned around the inside, by a partition member 21. It has become.

  As shown in FIG. 5, the partition member 21 can be freely detached from the container 13. A large number of circular openings 22 are provided in the partition member 21. The interior of each container 13 is divided into five container parts 20 by a partition member 21, and the container parts 20 are in communication with each other through the opening 22.

As shown in FIG. 6, in this embodiment, cylindrical pellet-shaped sodium chlorite a is used. When the pelletized sodium chlorite a is moved by the flow of the acidic liquid b, such as when the pelletized sodium chlorite a is small or light, the pelletized sodium chlorite a passes through the opening 22. It is necessary to set not to. In this embodiment, the diameter d ₁ of the opening 22 of the partition member 21 and the diameter d ₂ of the pelletized sodium chlorite a are in a relationship of d ₁ <d ₂ , and from the diameter d _{1 of the} opening 22. the diameter d ₂ of the pellet JoA sodium chlorate a is set to be larger. For this reason, the pelletized sodium chlorite a cannot pass through the opening 22 of the partition member 21, and the pelletized sodium chlorite a does not move between the container portions 20. Incidentally, in addition to increased setting the diameter d ₂ of the pellet JoA sodium chlorate a than the diameter d ₁ of the opening 22, for example, opening 22, the width which does not pass through the pellets JoA sodium chlorate a slit-like, etc. Thus, it can be set so that the pellet-like sodium chlorite a does not pass through.

  As shown in FIGS. 2 and 3, the nozzle 25 for the acidic liquid b is inserted from above into each container 13 placed on the heater 12. A tank 26 that stores the acidic liquid b is connected to the upper end of each nozzle 25. In addition, a pinch nozzle 27 is mounted in the middle of each nozzle 25, and the acid liquid b in the tank 26 is introduced into each container 13 through the nozzle 25 by opening the pinch nozzle 27. The pinch nozzle 27 is attached to a driving device 28 disposed outside the heater 12. The tank 26 is supported above the drive device 28.

  As shown in FIGS. 2 and 3, a pair of fans 30 are provided inside the space 11. The pair of fans 30 have the same height as each other and are disposed at a height between the container 13 and the fan filter unit 16. As shown in FIG. 2, the fans 30 are arranged at diagonal positions in the space 11 that is rectangular when viewed from above. The blowing directions L of the fans 30 are opposite to each other, and are set to be horizontally oriented along the shield 10. Thus, in this embodiment, in the state seen from the top as shown in FIG. 2, by blowing air in the air blowing direction L along the shield 10 from the two fans 30 in opposite directions, A swirl component in the counterclockwise rotation direction UC is added to the air inside the space 11.

The chlorine dioxide gas generator 1 is installed in a room such as a clean room. And the pellet-shaped sodium chlorite a is thrown into the container 13 of the chlorine dioxide gas generator 1. In this case, the pelletized sodium chlorite a is introduced into each of the plurality of container portions 20 partitioned by the partition member 21 inside the container 13. The amount of pelletized sodium chlorite a charged into one container part 20 may be an amount that is 0.5 g / cm 2 or less with respect to the bottom area of the container part 20 charged. In addition, the pinch nozzle 27 is opened, and the acidic liquid b in the tank 26 is introduced into the container 13 through the nozzle 25. At this time, as one container part 20, in this embodiment, the acidic liquid b is introduced into the central container part 20. Since each container part 20 in the container 13 communicates with each other through an opening 22 provided in the partition member 21, the acidic liquid b introduced into one container part 20 of the container 13 in this way is supplied to all each container. The portion 20 is supplied evenly. Note that the openings 22 are not necessarily provided in all the partition members, and it is sufficient that the acidic liquid b communicates with all the container portions 20 when the acidic liquid b is introduced into one container portion 20. However, it is possible to spread the acidic liquid b over the whole more quickly by providing the openings 22 in many partition members 21. Moreover, the container part 20 which introduce | transduces the acidic liquid b is not restricted to the center container part 20, and any container part 20 may be sufficient. Thus, in each container portion 20 in the container 13, the pelletized sodium chlorite a and the acidic liquid b chemically react to generate chlorine dioxide gas (ClO ₂ ) c. The reaction formula is as follows.
4NaClO ₂ + 2HOOC-CH (OH) -CH ₂ -COOH + O ₂ → 2NaOOC-CH (OH) -CH ₂ -COONa + 4ClO ₂ + 2H ₂ O

  In addition, the acidic liquid b supplied to the container 13 is heated by the heater 12, thereby promoting a chemical reaction between the pelletized sodium chlorite a and the acidic liquid b. In this case, since the pelletized sodium chlorite a and the acidic liquid b react in each container portion 20 of the container 13, chlorine dioxide gas c can be generated from the entire container 13. According to the prior art document 1, the time required for the gas concentration to reach the peak from the start of the reaction was reduced to 10 minutes, which was half that at 60 ° C, which took 20 minutes or more at 30 ° C. At 60 ℃, increase to 1.2 times 30 ℃.

  While the acidic liquid b is uniformly supplied to each container portion 20 of the container 13, the pellet-like sodium chlorite a does not pass through the opening 22 of the partition member 21 and does not move. The reaction between the pelletized sodium chlorite a and the acidic liquid b is performed in the absence. Further, the reaction amount of sodium chlorite in each container part 20 matches the initial set amount assumed for each container part 20 and does not cause ambient scattering contamination or liquid spillage due to mist. As a result, the chlorine dioxide gas c can be generated uniformly from the entire container 13, and the reaction efficiency is also improved.

  In addition, by using an edible organic acid such as malic acid, citric acid or acetic acid as the acidic liquid b to be supplied to the container 13, compared with the case of handling an acid such as hydrochloric acid or sulfuric acid which is toxic to the human body, Chlorine dioxide gas can be generated more safely and easily. Moreover, the same edible acidic aqueous solution, for example, tartaric acid, fumaric acid, succinic acid, gluconic acid, lactic acid, acetic acid, adipic acid, phytic acid, ascorbic acid or a mixture thereof can be used. Although an acid such as hydrochloric acid or sulfuric acid can be used, chlorine gas is generated when hydrochloric acid is used, and hydrogen sulfide gas may be generated when sulfuric acid is used. In any case, the chlorine dioxide gas c can be generated reliably and quickly by using an acidic liquid having a pH value of 3 or less.

  Moreover, pellet-shaped sodium chlorite a can be made into arbitrary magnitude | sizes and shapes by mixing a sodium chlorite powder with a binder and processing it into a pellet tablet or a tablet tablet. As the binder, water-soluble polymer compounds such as carboxymethyl cellulose, hydroxyethyl cellulose, and polyethylene glycol are used. Since the pelletized sodium chlorite a is solid, it can be easily stored and transported, 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 b into the container 13, the pelletized sodium chlorite a can be placed in the container 13 in advance. Pelletized sodium chlorite a is less soluble than powder at a liquid temperature of 30 ° C. or lower, but if the liquid temperature is 40 ° C., pelleted sodium chlorite a is 60% of the powder, 50% Peak concentrations of 80% at 90 ° C and 90% at 60 ° C are obtained. In addition, when an operator handles sodium chlorite powder, if airborne dust is sucked, if it adheres to the respiratory mucosal surface, it causes inflammation and may cause health problems. However, pelletized sodium chlorite a is advantageous in that there is no such concern.

  Further, the partition member 21 can be freely detached from the container 13. For this reason, there are few corners which are hard to wash, and the container 13 and the partition member 21 can be easily washed in the detached state. It is also convenient for maintenance.

  As a result of the operation of the fan filter unit 16 provided above the space 11, indoor air is introduced into the space 11 from the gap 17 formed below the shield 10 at a flow velocity of 24 cm / s, for example. Ascending airflow that flows toward the fan filter unit 16 is formed inside the space 11. Thus, the chlorine dioxide gas c generated in the container 13 is supplied to the room after passing through the fan filter unit 16. In this case, in the space 11, fine mist may be scattered when the bubbles of the chlorine dioxide gas c generated in the liquid in the container 13 rise to the liquid level and are repelled. The solid particles are captured by the HEPA filter built in the fan filter unit 16 and are not brought into the room. Thereby, indoor pollution is avoided.

In order to prevent the chlorine dioxide gas c and mist generated inside the space 11 from leaking from the gap 17, it is necessary to suck ambient air from the gap 17 into the space 11 at 15 cm / s or more. There is. The airflow direction existing near the floor of the gap 17 overcomes the wind speed of random heat convection (maximum wind speed is about 15 cm / s), thereby preventing the contamination mist from leaking from the gap 17 to the outside. Thus, the knowledge that the suction speed into the space 11 is 15 cm / s or more can be found, for example, in Architectural Institute of Japan Environmental Studies No. 586 25-32, December 2004 J. Environ. Eng.,
AIJ, No.586, 25-32, Dec, 2004 Subject experiment and numerical analysis. Investigation of Coughed Spit's Transmission Characteristics in a
Calm Environment by Subject Experiment and Numerical Analysis Wei Toki *, Shinsuke Kato **, Shengwei Liang * Shengwei ZHU,
According to Shinsuke KATO, Jeong-Hoon YANG, the existence of thermal convection in which the direction of 0.2 m / s or less is not determined even in the absence of airflow is pointed out. As a result of measurement by the inventor with a hot wire anemometer, it was found that the wind speed of this thermal convection was around 15 cm / s.

  Further, while the fan filter unit 16 is operated, an upward airflow is formed in the space 11, while the shield 10 is oppositely directed from a pair of fans 30 arranged at diagonal positions in the space 11. The air is blown in the air blowing direction L along. Thereby, in this embodiment, the swirl component of the counterclockwise rotation direction UC is added to the air inside the space 11 when viewed from above as shown in FIG. As a result, a swirling updraft that rises toward the fan filter unit 16 while turning in the counterclockwise rotation direction UC is generated inside the space 11. At this time, since the gaps 17 are provided on the four circumferences, the indoor air is uniformly sucked into the space 11, and a uniform airflow is generated in the entire space 11. As a result, the chlorine dioxide gas c generated in the container 13 can be put on this swirling updraft, lifted up to the fan filter unit 16, and supplied into the room. The molecular weight of chlorine dioxide gas c is 67.5, which is 2.3 times the weight of air molecular weight 28.8. By placing such heavy chlorine dioxide gas c on the swirling updraft and lifting it up to the fan filter unit 16, the chlorine dioxide gas c can be evenly diffused into the room that is the decontamination target room. Since the swirling flow becomes a strong upward airflow when it is counterclockwise by the Coriolis force like the tornado, in the northern hemisphere, as shown in FIG. It is desirable to arrange so as to form a swirling airflow that becomes the counterclockwise rotation direction UC. Conversely, in the Southern Hemisphere, it is desirable to form a swirling airflow that is clockwise with the fan 30. In this way, the chlorine dioxide gas c can be released into the entire room such as a clean room and used for deodorization, sterilization of microorganisms, sterilization, and the like.

  Since the chlorine dioxide gas c released from the fan filter unit 16 has a temperature higher than the ambient temperature, the chlorine dioxide gas c rises and then forms a large circulating air flow along the ceiling and side walls in the room, thereby decontaminating the entire room. Go around evenly.

  In addition, the molecular weight of the chlorine dioxide gas c is extremely heavy compared to the molecular weight of air, and the molecular weight of the chlorine dioxide gas c hangs down in the direction of gravity drop due to its own weight in the direction of gravity and does not diffuse in the room at a uniform concentration. In the present invention, the presence of the air flow vertically upward generated in the space 11 by the fan filter unit 16 is convenient for the generation of the chlorine dioxide gas c and the uniform diffusion into the space 11 because of the mist mixture generated. When the chlorine dioxide gas c rises upward, it was found that in an atmosphere of a temperature of 25 ° C. and 70% RH in the space 11, 20 μm of mist forms dry droplets in an average of 1.3 seconds. According to the book “Aerosol Technology”, as long as the vertical upward air flow in the space 11 reaches the fan filter unit 16 taking 1.3 seconds or more from the generation part of the chlorine dioxide gas c, the air flow is 20 μm or less within that time. The mist is completely dry, and even if it adheres to the equipment part of the fan filter unit 16 or the filter metal frame, it is not as corrosive as the mist. As a result of the measurement, the maximum particle size of the floating mist generated in the present invention is 20 μm, and if the mist component is reduced as much as possible from adhering to the fan filter unit 16 as much as possible, it should be adhered after drying in the airflow. The trouble of corrosion can be reduced as much as possible. Assuming that the distance L between the gas generation unit and the fan filter unit 16 and the average flow velocity U in the space 11 are L / U ≧ 1.3 sec, FFU damage due to metal corrosion of the fan filter unit (FFU) 16 is suppressed. succeeded in.

  As mentioned above, although an example of the preferred embodiment of this invention was demonstrated, this invention is not limited to the form shown here. For example, the container 13 placed on the heater 12 is not limited to the rectangular shape as shown in FIG. 4, and a cylindrical container 13 as shown in FIG. 7 may be used. The number of containers 13 placed on the heater 12 may be one or any plural number. In addition, if the residence time of the chlorine dioxide gas c in the space 11 is set to 1.3 sec or more, it is possible to effectively prevent the mist mixed in the chlorine dioxide gas c generated in the space 11 from leaking from the gap 17. become able to. Further, the arrangement of the fan filter unit 16 is not limited to the upper part of the chlorine dioxide generator 1 but may be provided in the upper part of the space 11. For example, the fan filter unit 16 may be provided on the side of the chlorine dioxide generator 1 and the gas may be blown sideways. Even in this case, since the generated chlorine dioxide gas c is higher than the ambient temperature, it rises and circulates in the room along the ceiling and side walls.

  For example, a fan filter unit is provided above the space surrounded by the shield, and indoor air is sucked into the space from the gap formed below the shield by the operation of the fan filter unit. In the space, an updraft flowing toward the fan filter unit is formed. For this reason, the chlorine dioxide gas generated by the reaction between the pelletized sodium chlorite and the acidic liquid in the container disposed in the space passes through the fan filter unit and is then supplied to the room. In this case, in the space, fine mist may be scattered when the bubbles of chlorine dioxide gas generated in the liquid in the container rise to the liquid level, and the solid particles generated by the mist are scattered. Captured by the fan filter unit, indoor contamination is avoided.

  Also, for example, inside the space, a swirling component is added to the updraft by blowing air from the fan, so that chlorine dioxide gas can be placed on the swirling updraft and lifted up to the fan filter unit to supply air indoors. It becomes. The molecular weight of chlorine dioxide gas is 67.5, which is 2.3 times the weight of air molecular weight 28.8. By placing such heavy chlorine dioxide gas on the swirling updraft and lifting it to the fan filter unit, the chlorine dioxide gas can be evenly diffused into the room that is the decontamination target room.

In the center of the clean room 3.3mW × 3.7mL × 2.02mH class 10 of 25m ³ (≒ 25m ^3), stop the clean air circulating blower, by reacting sodium chlorite powder with an acidic solution to generate chlorine dioxide gas . In the example of the present invention, as described in FIG. 1 and the like, chlorine dioxide gas is generated inside the space surrounded by the shield and is released into the room through the fan filter unit (with FFU booth. FIGS. 8 and 9). . On the other hand, in the comparative example, chlorine dioxide gas was generated in a state where neither the shield nor the fan filter unit was present, and was released as it was (without the FFU booth, FIGS. 10 and 11). FIG. 8 (vertical axis 0 to 4000 count / m ³ ) and FIG. 9 (vertical axis 0 to 20 count / m ³ ) show the relationship between elapsed time and particle concentration in the present invention. The relationship between the elapsed time and the particle concentration in the comparative example is shown in FIG. 10 (vertical axis 0 to 4000000 count / m ³ ) and FIG. 11 (vertical axis 0 to 400000 count / m ³ ).

After 30 minutes, the comparative example (without booth) had about 3.5 million particles in the air with a particle size of 0.3 μm or more in 1 m ³ whereas the present invention example (with booth) had around 10 Stayed in. The effect of the present invention was confirmed.

  The maximum size of the mist that scatters with the generation of chlorine dioxide gas is 100 μm (about 0.1 mm diameter), and the sedimentation speed is specific gravity 1 as clearly shown in FIG. 6 at the end of the book “Aerosol Technology”. In the case of water droplets of, the mist will gravity settle unless it is increased to 25 cm / s or more. When the suction speed of the fan filter unit (suction speed with the airflow direction upward) is 22 cm / s, mist of such a size descends and drops and adheres to the floor or the top of the device, or the bottom of the transparent vinyl curtain There is also a risk of going outside through the opening (gap). In order to prevent such contaminated mist from leaking to the outside (rooms such as clean room areas), the airflow direction existing near the vinyl curtain floor is set to random heat convection (maximum wind speed is 15 cm / s). It is necessary to suck at 15 cm / s or more from the transparent vinyl curtain hem opening part (gap) at a wind speed that constantly overcomes the airflow from the surroundings and never leaks outside.

  In addition, as shown in FIG. 12, the sedimentation speed is proportional to the specific gravity of the target particles. For example, when the particle diameter is 100 μm, the specific gravity is 25 cm / s and the specific gravity is 0.7, and 17.5 cm / s [25 cm / s × 0.7].

  When the fan filter unit sucks mist that has been scattered due to the generation of chlorine dioxide gas, the arrangement order of the fan unit (usually composed of a blower, electrical wiring, and control circuit) and the filter unit in the air flow direction is very important. If the filter unit is located upstream (container 13 side in FIG. 1 etc.) and the fan unit is located downstream (ceiling side in FIG. 1 etc.), the HEPA filter first removes mist components and the fan unit Since only chlorine gas flows in, the fan unit did not show any visible corrosion even during operation for a total of 100 hours at a chlorine dioxide gas concentration of 200 ppm, unless it was high humidity air with a relative humidity exceeding 90% RH. On the other hand, when the filter unit is arranged on the downstream side (ceiling side in FIG. 1 and the like) and the fan unit is arranged on the upstream side (container 13 side in FIG. 1 and the like), the mist component flows into the fan unit without being removed. It adheres to the fan unit steel member blower, electrical wiring, control circuit, etc., and then mist and particle components are removed by the HEPA filter of the filter unit. For this reason, corrosion degradation of the fan unit to which mist has adhered is remarkable. Mist component deposition causes significant corrosion to the fan unit compared to gas component contact. Therefore, in the fan filter unit, it is desirable that the filter unit is disposed on the upstream side (the floor side in FIG. 1 and the like) and the fan unit is disposed on the downstream side (the ceiling side in FIG. 1 and the like).

  The present invention is useful for deodorization in a room such as a clean room, sterilization and sterilization of microorganisms.

a pellet sodium chlorite b acid liquid c chlorine dioxide gas 1 chlorine dioxide gas generator 10 shield 11 space 12 heater 13 container 15 support 16 fan filter unit 20 container part 21 partition member 22 opening 25 nozzle 26 tank 27 pinch Nozzle 28 Drive device 30 Fan

Claims (5)

A chlorine dioxide gas generator for supplying a pellet sodium chlorite and an acidic liquid to a container and generating chlorine dioxide gas by a chemical reaction between the two,
The container is provided in a space surrounded by a shield,
The container is divided into a plurality of container parts, and each container part communicates with each other through an opening having a size that prevents pelleted sodium chlorite from passing therethrough. Generator.   The chlorine dioxide gas generator according to claim 1, further comprising a partition member that divides the interior of the container into a plurality of container parts, wherein the partition member is detachable from the container.   The chlorine dioxide gas generator according to any one of claims 1 to 3, further comprising a heater for heating the acidic liquid supplied to the container. In the chlorine dioxide gas generator, pelletized sodium chlorite and an acidic liquid are supplied, and a chemical reaction between the two generates chlorine dioxide gas,
A container that is partitioned into a plurality of container parts, and each container part communicates with each other through an opening having a size that prevents passage of pellet-like sodium chlorite. Using the chlorine dioxide gas generated by the chlorine dioxide gas generator according to any one of claims 1 to 3, the indoor deodorization, sterilization of microorganisms, or sterilization is performed. How to use chlorine dioxide gas.

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