JP6306420B2 - Decontamination method and apparatus - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is used to sterilize the whole room after use in a room that handles microorganisms such as bacteria, substances that act on immunity of organisms, biological cells, etc., such as bioclean rooms in pharmaceutical manufacturing facilities and animal experiment facilities. The present invention relates to a decontamination method and apparatus.

  Conventionally, decontamination by formaldehyde fumigation has been the mainstream for sterilizing indoors such as bioclean rooms. However, formaldehyde is highly toxic and may cause carcinogenic effects on the human body. Since the regulations were strengthened by the amendment, the use has been avoided.

  For this reason, decontamination methods using disinfectants such as hydrogen peroxide, ozone, peracetic acid, and chlorine dioxide have been studied as an alternative to formaldehyde fumigation. However, formaldehyde is easy to vaporize even at room temperature and is difficult to condense when heated from an aqueous solution and vaporized. However, some alternative disinfectants have a boiling point that is not as high as that of formaldehyde and are not easily vaporized.

  As an example of the decontamination method, there is a so-called wet-type decontamination method that uses hydrogen peroxide and performs decontamination under conditions exceeding the saturation concentration. Hydrogen peroxide is a non-toxic and safe substance that becomes oxygen and water after decomposition, and it is decontaminated by heating and vaporizing a commercially available 30-35 wt% aqueous solution, but it is sealed in a target room with limited volume. By continuing to heat and vaporize until the saturation concentration of air is exceeded, the room can be filled to the maximum concentration of hydrogen peroxide as a gas at that temperature, and efficient decontamination is possible. Condensation of hydrogen oxide may cause corrosion in indoor interiors and equipment.

  In addition, in order to avoid the corrosion, a so-called dry method that performs decontamination while avoiding the condensation of hydrogen peroxide vapor while determining the presence or absence of condensation of the hydrogen peroxide vapor by calculation based on the calculation formula of the saturated vapor pressure. There is a decontamination method.

  For example, Patent Document 1 shows a general technical level related to the dry decontamination method.

Japanese Patent No. 4977233

  However, in the dry-type decontamination method disclosed in Patent Document 1, the fact that hydrogen peroxide does not exceed the saturation condition during decontamination indicates that the hydrogen peroxide vapor pressure in the indoor temperature and humidity state of the decontamination target and Water vapor pressure, saturated hydrogen peroxide vapor pressure and saturated water vapor pressure at the room temperature, liquid phase mole fraction, and activity coefficient must all be calculated in real time by a computer, making condensation judgment extremely complicated. Had the disadvantages. Other dry-type decontamination methods include monitoring the indoor condensation of hydrogen peroxide vapor with a condensation sensor, and there is also a technique for monitoring the disappearance of condensation of hydrogen peroxide vapor in the condensation sensor. If it is condensed at the position, it is likely that it is condensed somewhere in the room, and it does not become dry.

  Further, in the conventional decontamination method, a vaporization evaporation type apparatus is used for generation of hydrogen peroxide vapor in both the wet method and the dry method, but the vaporization evaporation type device is very expensive and handled. It was difficult, and a specialized operator was required.

  The present invention has been made in view of the above-described conventional problems, can easily perform condensation determination, and can reliably decontaminate a room by a dry method without using a vaporization evaporation type apparatus. An object of the present invention is to provide a decontamination method and apparatus that can be dispensed with by an operator.

The present invention is a decontamination method for performing decontamination indoors by mist spraying a disinfectant containing water,
A measuring step for measuring the indoor temperature θ, the relative humidity φ, and the disinfectant concentration C;
A display step for displaying the temperature θ, the relative humidity φ, and the disinfectant concentration C measured in the measurement step;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A form preparation step for preparing a form that is output in the form of a graph that is previously calculated and graphed,
Based on the temperature θ displayed in the display step and the disinfectant concentration C, a control relative humidity φ _{S at} which condensation occurs is obtained from the diagram prepared in the form preparation step, and is displayed in the display step. when the relative humidity phi is determined to be lower than the control relative humidity phi _S performs decontamination, actuates the forced stop switch when the relative humidity phi is determined to be controlled relative humidity phi _S or And a dew condensation determination step for stopping the decontamination.

The present invention is a decontamination method for performing decontamination indoors by mist spraying a disinfectant containing water,
A measuring step for measuring the indoor temperature θ, the relative humidity φ, and the disinfectant concentration C;
A display step for displaying the temperature θ, the relative humidity φ, and the disinfectant concentration C measured in the measurement step;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A preparatory process for preparing a form that is pre-calculated and graphed, and then preparing a form that is output as a diagram that is displayed by reducing the value of the axis of relative humidity φ by a predetermined value;
Based on the temperature θ and the disinfectant concentration C displayed in the display step, the control relative humidity φ _{S at} which condensation occurs is obtained from the diagram prepared in the form preparation step, and is displayed in the display step. If the relative humidity phi is determined to be lower than the control relative humidity phi _S to perform decontamination that actuates the forced stop switch when the relative humidity phi is determined to be controlled relative humidity phi _S or And a dew condensation determination step for stopping the decontamination.

In the decontamination method,
The value of the axis of the relative humidity φ of the binary vapor disinfectant saturated vapor pressure line of the air disinfectant and water showing the relationship between the relative humidity φ and the disinfectant concentration C, which was calculated and graphed in advance. It is preferable that the predetermined value to be displayed by decreasing the value takes any value of 2 to 10%.

In the decontamination method, the condensation determination step relative humidity phi is determined to be lower than the control relative humidity phi _S in the forced stop switch when the decontamination inoperative state is performed, the disinfectant concentration C, always the performed mist spray, the concentration capping disinfectant concentration C disinfectant when lower than sterilization agent concentration lower limit set value C _L0 based on a predetermined disinfectant concentration Cs is set to hold as indoor concentration it is preferred when the a value C _H1 or having a mist spray start-stop step of stopping the mist spray.

In the decontamination method,
The predetermined disinfectant concentration Cs is preferably 150 to 400 ppm.

  In the decontamination method, the temperature θ is preferably 15 to 30 ° C.

  In the decontamination method, the disinfectant is preferably hydrogen peroxide.

The present invention includes a thermometer for measuring a temperature θ in a room to be decontaminated ;
A hygrometer for measuring the relative humidity φ in the room;
A densitometer for measuring the disinfectant concentration C in the room;
A shut-off valve provided in the middle of an air pipe for supplying compressed air for spraying to the spray unit;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A form that was previously calculated and graphed, and a form that was output,
Power control panel,
The power control panel is
A display for displaying the temperature θ measured by the thermometer, the relative humidity φ measured by the hygrometer, and the disinfectant concentration C measured by the densitometer;
Based on the temperature θ displayed on the indicator and the disinfectant concentration C, the control relative humidity φS is obtained from the relative humidity φS at which condensation occurs from the diagram described in the form, and the power control panel When it is determined that the displayed relative humidity φ is equal to or higher than the control relative humidity φS, a forced stop switch for outputting a close command to the shutoff valve to stop decontamination and a relative value measured by the hygrometer When it is determined that the humidity φ is lower than the control relative humidity φS and the decontamination is performed while the forced stop switch is in the non-operating state, the disinfectant concentration C is set to a predetermined concentration that is always maintained as the indoor concentration when lower than sterilization agent concentration lower limit set value C _L0 based on bacterial concentration Cs is by outputting an open command to the shut-off valve performs a mist spray, the disinfectant concentration C disinfectant concentration upper limit set value C _H1 or Closes to the shut-off valve And an automatic control system that outputs an open / close command to the shutoff valve according to the disinfectant concentration C measured by the densitometer so as to stop the mist spraying by outputting a command. It is applied to the dyeing device.

The present invention includes a thermometer for measuring a temperature θ in a room to be decontaminated ;
A hygrometer for measuring the relative humidity φ in the room;
A densitometer for measuring the disinfectant concentration C in the room;
A shut-off valve provided in the middle of an air pipe for supplying compressed air for spraying to the spray unit;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A graph that is calculated in advance and graphed, and then output as a diagram showing the relative humidity φ axis reduced by a predetermined value,
Power control panel,
The power control panel is
A display for displaying the temperature θ measured by the thermometer, the relative humidity φ measured by the hygrometer, and the disinfectant concentration C measured by the densitometer;
Based on the temperature θ displayed on the indicator and the disinfectant concentration C, the control relative humidity φS is obtained from the relative humidity φS at which condensation occurs from the diagram described in the form, and the power control panel When it is determined that the displayed relative humidity φ is equal to or higher than the control relative humidity φS, a forced stop switch for outputting a close command to the shutoff valve to stop decontamination and a relative value measured by the hygrometer When it is determined that the humidity φ is lower than the control relative humidity φS and the decontamination is performed while the forced stop switch is in the non-operating state, the disinfectant concentration C is set to a predetermined concentration that is always maintained as an indoor concentration. when lower than sterilization agent concentration lower limit set value C _L0 based on bacterial concentration Cs is by outputting an open command to the shut-off valve performs a mist spray, the disinfectant concentration C disinfectant concentration upper limit set value C _H1 or Closes to the shut-off valve And an automatic control system that outputs an open / close command to the shutoff valve according to the disinfectant concentration C measured by the densitometer so as to stop the mist spraying by outputting a command. It is applied to the dyeing device.

In the decontamination apparatus,
The value of the axis of the relative humidity φ of the binary vapor disinfectant saturated vapor pressure line of the air disinfectant and water showing the relationship between the relative humidity φ and the disinfectant concentration C, which was calculated and graphed in advance. It is preferable that the predetermined value to be displayed by decreasing the value takes any value of 2 to 10%.

In the decontamination apparatus,
The decontamination apparatus, wherein the predetermined disinfectant concentration Cs is 150 to 400 ppm.

  In the decontamination apparatus, the temperature θ is preferably 15 to 30 ° C.

In the decontamination apparatus,
Further equipped with a detoxification device for detoxifying the mist sprayed in the room,
It is preferable to output a start command from the power control panel to the abatement apparatus.

In the decontamination apparatus, the disinfectant is preferably hydrogen peroxide.
Further, in the decontamination apparatus, a plurality of agitation fans installed in the same direction as the circulating agitating airflow through the outlet so that an agitating airflow that circulates along the indoor wall surface to be decontaminated,
A spray unit that mist sprays a disinfectant containing water in the same direction as the circulating stirring airflow inside the circulating stirring airflow,
By controlling the mist sprayed from the spray unit by the circulating agitating airflow in the room, the dehumidifying agent on the wall surface of the room is controlled by keeping the airflow of low humidity along the wall surface in the room. It is preferable to do.

  According to the decontamination method and apparatus of the present invention, the condensation determination can be easily performed, and the interior can be reliably decontaminated in a dry manner without using a vaporization evaporation type apparatus, and a specialized operator can be dispensed with. An excellent effect can be achieved.

1 is an overall schematic perspective view showing an embodiment of a decontamination method and apparatus of the present invention. It is a control block diagram which shows the Example of the decontamination method and apparatus of this invention. It is a flowchart which shows the Example of the decontamination method and apparatus of this invention. It is a diagram which shows the saturated vapor pressure in the air of the two-component system of disinfectant (hydrogen peroxide) and water.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 4 show an embodiment of the decontamination method and apparatus of the present invention, which are microorganisms such as bacteria, substances that act on immunity of organisms, and cells of organisms, such as bioclean rooms in pharmaceutical manufacturing facilities and animal experiment facilities. A plurality of tower-type agitators installed in the same direction as the agitating airflow circulating through the air outlet 3a so that an agitating airflow circulating along the wall surface of the room 1 to be decontaminated is generated in the room 1 that handles the decontamination A fan 3 and a spray unit 2 for mist spraying a disinfectant containing water in the same direction as the circulating stirring airflow are arranged inside the circulating stirring airflow. The tower-type agitating fan 3 is arranged at the corners of the room 1 (the four corners in the example of FIG. 1) where the direction of the agitated agitating air changes suddenly. It is advantageous from the aspect of directing the stirring airflow due to the arrangement of the air outlet 3a of the stirring fan 3 when it is circulated as affixed. The mist sprayed from the spray unit 2 by the circulating agitating air current is spread over the room 1 so that a low-humidity air current is directed along the wall surface of the room 1, thereby disinfecting the wall surface of the room 1. This controls the dew condensation. As a result, while the mist sprayed from the spray unit 2 is evenly distributed in the room 1, air close to the saturated vapor pressure that may condense on the wall surface of the room 1 is prevented from approaching. In this embodiment, hydrogen peroxide is used as the disinfectant.

  A compressor 4 is connected to the spray unit 2 via an air pipe 5, and an electromagnetic shut-off valve 6 is provided in the middle of the air pipe 5. Supply / stop of compressed air is performed via the pipe 5, and hydrogen peroxide as a disinfectant containing water is sprayed with mist from the spray unit 2 so as to be controlled on and off.

  In the room 1, a thermometer 7 for measuring a temperature θ [° C.], a hygrometer 8 for measuring a relative humidity φ [% RH] (RH: Relative Humidity), and a hydrogen peroxide concentration C [ppm] are measured. A densitometer 9 is arranged.

  Further, a detoxifying device 10 for detoxifying hydrogen peroxide sprayed with mist is disposed in the chamber 1. As the abatement apparatus 10, for example, an apparatus in which activated carbon is incorporated and hydrogen peroxide is adsorbed on activated carbon by sucking and discharging the air in the room 1 can be used. However, the ventilator for exhausting the air in the room 1 to the outside while passing it through the HEPA filter that physically removes bacteria and the like from the outside air and introducing it into the room 1 is not limited to this type. It may be used as the abatement apparatus 10.

  The thermometer 7, the hygrometer 8, and the concentration meter 9 are connected to a power control panel 11 via measurement signal wirings that can send measurement signals. As shown in FIG. 2, the power control panel 11 is provided with a temperature indication adjusting unit 12 provided with a display unit 12D for displaying an actual temperature θ and a humidity provided with a display unit 13D for displaying an actual relative humidity φ. The indication adjustment unit 13 and the concentration indication adjustment unit 14 provided with a display unit 14D for displaying the actual hydrogen peroxide concentration C are provided.

The measurement signal wiring will be described. For example, when a signal is put on a weak direct current as an analog method, the temperature indication adjustment unit 12 assigns a temperature θ to a current of 4 to 20 mA and outputs a temperature measurement value from the thermometer 7. It comes to input. The relative humidity φ is assigned to a current of 4 to 20 mA and input as a humidity measurement value from the hygrometer 8 to the humidity instruction adjusting unit 13. The concentration instruction adjusting unit 14 is inputted with the hydrogen peroxide concentration C from the densitometer 9 as a concentration measurement value of 4 to 20 mA. The concentration instruction adjusting unit 14 is a deviation between the measured concentration value assigned to the input current of 4 to 20 mA of the hydrogen peroxide concentration C and the preset hydrogen peroxide concentration upper limit value C _H1. When the deviation is positive, an open / close command is output to the selector 19 as an ON-OFF contact signal. Of course, the signal to be loaded may be, for example, an analog voltage signal of 1 to 5 V or a digital pulse signal. The temperature indication adjustment unit 12 and the humidity indication adjustment unit 13 only need to display temperature measurement values and humidity measurement values. For example, the main body of the thermometer 7 or the hygrometer 8 and the probe are connected via a cable. In the case of a mold that is separated from each other, if the main body has a display portion, it may be substituted.

  Here, FIG. 4 is a diagram showing the saturated vapor pressure in the air of the binary system of hydrogen peroxide and water, and the theoretical formula thereof decreases downward for each temperature θ as shown by the solid line in FIG. The curve is a gentle curve that protrudes downward, and is printed on a form 16 carried by the decontamination worker 15 in the form of a graph calculated in advance for each integer temperature value within the assumed range of the temperature θ of the room 1. ing. Obtaining this theoretical formula in real time each time makes the calculation very complicated, but there is no particular problem if the one already printed on the form 16 as a saturated vapor pressure diagram is used.

Incidentally, the theoretical formula regarding the saturated vapor pressure of the two-component system is expressed as follows.
[Equation 1]
P _W = γ _W χ _W P _W ^o
[Equation 2]
_{P H = γ H χ H P} H o
[Equation 3]
_{γ W = exp {(1-} χ W) 2 / RT × [B 0 -B 1 (1-4χ W) + B 2 (1-2χ W) (1-6χ W)]}
[Equation 4]
^{_{γ H = exp {χ W 2}} / RT × [B 0 + B 1 (3-4χ W) + B2 (1-2χ W) (5-6χ W)]}
[Equation 5]
χ _W + χ _H = 1
[Equation 6]
^{_{P W o = exp (A W}} -B W / (C W + θ))
[Equation 7]
^{_{P H o = exp (A H}} -B H / (C H + θ))
However, P _W : Saturated vapor pressure of water under two components of water and hydrogen peroxide [Torr]
P _H : Saturated vapor pressure of hydrogen peroxide under two components of water and hydrogen peroxide [Torr]
γ _W : Activity coefficient γ _H : Activity coefficient χ _W : Liquid phase mole fraction of water in hydrogen peroxide χ _H : Liquid phase mole fraction of hydrogen peroxide in hydrogen peroxide P _W ^o : Water component Saturated vapor pressure of water when there is only water [Torr]
P _H ^o : Saturated vapor pressure of hydrogen peroxide when only hydrogen peroxide component is present [Torr]
R: Gas constant T: Absolute temperature [K]
B ₀ , B ₁ , B ₂ : Constants A _W , B _W , C _W : Constants A _H , B _H , C _H : Constants

In addition, the theoretical formula is a gradual curve with a downward convex shape at each temperature θ as shown by the solid line in FIG. 4, but once the relationship between the relative humidity φ and the hydrogen peroxide concentration C A saturated vapor pressure line of hydrogen peroxide in water and water in the air showing a graph representing an integer temperature value calculated in advance within the range of the temperature θ of the room 1 assumed, More preferably, the relative humidity φ is reduced to a predetermined value and displayed as a diagram. Thereby, already become shifted on the safe side represented by a predetermined value, if simply compare the relative humidity phi _S obtained by the display and diagrams can be prevented reliably dew condensation.

In this embodiment, the decontamination worker 15 measures the temperature θ measured by the thermometer 7 and displayed on the display unit 12D, and the hydrogen peroxide concentration measured by the densitometer 9 and displayed on the display unit 14D. Based on C, from the saturated vapor pressure diagram printed on the form 16, the relative humidity φ _{S at which} condensation occurs, that is, the saturated relative humidity, or a value obtained by subtracting a predetermined value from the relative humidity φ _S and reducing the value is displayed. set value, that is, so as to determine as a control relative humidity phi _S.

If the hygrometer 8 the relative humidity phi displayed on the display unit 13D is measured by is the control relative humidity phi _S or pushes the forced stop switch 17 of the push-button is decontamination personnel 15, decontamination Is supposed to stop. When the decontamination worker 15 pushes the forced stop switch 17, the destructive device control unit of the power control panel 11 is forcibly output to the shutoff valve 6 via the selector 19 of the power control panel 11. A start command is output from 18 to the abatement apparatus 10, and an alarm command is output to the dew condensation alarm 20. Needless to say, the forcible stop switch 17 is not limited to a push button type, and a switch for lowering a lever or other various types of switches may be selected.

While the hygrometer 8 the relative humidity phi displayed on the display unit 13D is measured by the below control the relative humidity phi _S, the forcible stop switch 17 without decontamination operator 15 presses the forced stop switch 17 unactuated When the hydrogen peroxide concentration C is lower than the hydrogen peroxide concentration lower limit set value C _L0 when the decontamination is performed, an opening command is sent from the concentration instruction adjusting unit 14 to the shutoff valve 6 via the selector 19. When the hydrogen peroxide concentration C is equal to or higher than the hydrogen peroxide concentration upper limit value C _H1 , a close command is output from the concentration instruction adjusting unit 14 to the shutoff valve 6 via the selector 19. And mist spraying is stopped.

In this embodiment, the hydrogen peroxide concentration lower limit set value C _L0 is 210 ppm, and the hydrogen peroxide concentration upper limit set value C _H1 is 230 ppm. This is because hydrogen peroxide is sprayed and vaporized, then decomposes in the air and decomposes into oxygen and water (half-life is said to be several tens of minutes). In order to keep the fungus agent concentration Cs, for example, 200 ppm, spray management is performed at such upper and lower concentration. Even when the air concentration is set to 300 ppm, for example, the lower limit can be raised to about +10 ppm and the upper limit can be raised to about +30 to +50 ppm for management. In addition, the hydrogen peroxide concentration range as a disinfectant can be 150-400 ppm.

On the other hand, FIG. 3 is a flowchart showing an embodiment of the decontamination method and apparatus of the present invention. First, as the step S1, the shutoff valve 6 is held in a closed state. As a subsequent step S2, a measurement process for measuring the temperature θ, the relative humidity φ, and the hydrogen peroxide concentration C in the room 1 is performed. As step S3, a display step for displaying the temperature θ, the relative humidity φ, and the hydrogen peroxide concentration C measured in the measurement step is performed. As step S4-1, the relative humidity φ _{S at} which dew condensation is generated from the saturated vapor pressure diagram printed on the form 16 based on the temperature θ and the hydrogen peroxide concentration C displayed in the display step is decontaminated as a worker 15 condensation determined, in step S4-2, wherein when the display process relative humidity phi displayed in the determined by the decontaminated personnel 15 If it is controlled relative humidity phi _S or more to stop the decontamination as step S5 A determination step is performed. When it is determined in the dew condensation determination step that the relative humidity φ is lower than the control relative humidity φ _S , as a subsequent step S6, a time t [min] from the start of decontamination is set to a set time t _set (for example, 240 [min] = 4 [hr]) When it is determined that more than has elapsed, decontamination is completed in step S7. When the time t [min] from the start of the decontamination is less than the set time t _set , when it is determined in step S8 that the hydrogen peroxide concentration C is lower than the hydrogen peroxide concentration lower limit set value C _L0 , step S9 As a result, the shutoff valve 6 is opened and mist spraying is performed. In subsequent step S10, when it is determined that the hydrogen peroxide concentration C is equal to or higher than the hydrogen peroxide concentration upper limit value C _H1 , in step S11, the shutoff valve 6 is closed and mist spraying is stopped, and the process proceeds to step S2. Returning, the same operation as described above is repeated. When it is determined in step S8 that the hydrogen peroxide concentration C is equal to or higher than the hydrogen peroxide concentration lower limit setting value _CLO , the process proceeds to the determination in step S10. In step S10, the hydrogen peroxide concentration C is determined. There when it is determined to be lower than the concentration of hydrogen peroxide upper limit set value C _H1, the process returns to step S2 without closing the shut-off valve 6. Incidentally, the operation of step S8 to step S11 is a mist spray start / stop process.

  Next, the operation of the above embodiment will be described.

  As shown in the flowchart of FIG. 3, first, the shutoff valve 6 is kept closed as step S1.

  In subsequent step S2, the temperature θ, relative humidity φ, and hydrogen peroxide concentration C in the room 1 are measured by the thermometer 7, the hygrometer 8, and the concentration meter 9 (measurement step). As step S3, the temperature θ, the relative humidity φ, and the hydrogen peroxide concentration C measured in the measuring step are displayed on the display unit 12D of the temperature instruction adjusting unit 12 of the power control panel 11 shown in FIGS. Are displayed on the display unit 13D of the humidity instruction adjusting unit 13 and the display unit 14D of the concentration instruction adjusting unit 14 (display process).

In step S4-1, the relative humidity φ _{S at} which dew condensation occurs from the saturated vapor pressure diagram printed on the form 16 based on the temperature θ and the hydrogen peroxide concentration C displayed in the display step is decontamination worker. 15 is required. Further, in step S4-2, the display process relative humidity phi displayed in the is determined whether or not control the relative humidity phi _S or performed by decontamination worker 15 (condensation determination step). Here, for example, when the temperature θ = 20 [° C.] and the hydrogen peroxide concentration C = 200 [ppm], the relative humidity φ _S at which condensation occurs is the saturated vapor shown in FIG. From the pressure diagram, it is approximately 79 [%]. For example, based on this, 79 [%] may be used as it is. However, it is preferable to calculate the control relative humidity φ _S as 74 [%] by performing an operation for reducing the predetermined value as 5 [%], for example. That is, at this point, the relative humidity phi displayed on the display unit 13D of the power control panel 11 is lower than the control relative humidity phi _S, will not occur condensation.

When it is determined in the dew condensation determination step that the relative humidity φ is lower than the control relative humidity φ _S , as a subsequent step S6, a time t [min] from the start of decontamination is set to a set time t _set (for example, 240 [min] = 4 [hr]) It is determined whether or not more than elapses.

When the time t [min] from the start of the decontamination is less than the set time t _set , when it is determined in step S8 that the hydrogen peroxide concentration C is lower than the hydrogen peroxide concentration lower limit set value C _L0 , step S9 As a result, the shutoff valve 6 is opened and mist spraying is performed (mist spray start / stop process). The mist spray start / stop process is performed by an open command output from the concentration instruction adjusting unit 14 shown in FIG. 2 to the shutoff valve 6 via the selector 19.

In subsequent step S10, when it is determined that the hydrogen peroxide concentration C is equal to or higher than the hydrogen peroxide concentration upper limit set value C _H1 , in step S11, the shutoff valve 6 is closed and mist spraying is stopped (mist spray generation). Stop process). The mist spray start / stop process is performed by a close command output from the concentration instruction adjusting unit 14 shown in FIG. 2 to the shutoff valve 6 via the selector 19.

  Thereafter, the process returns to step S2, and the same operation as described above is repeated.

When it is determined in step S8 that the hydrogen peroxide concentration C is equal to or higher than the hydrogen peroxide concentration lower limit setting value _CLO , the process proceeds to the determination in step S10. In step S10, the hydrogen peroxide concentration C is determined. There when it is determined to be lower than the concentration of hydrogen peroxide upper limit set value C _H1, the process returns to step S2 without closing the shut-off valve 6.

  When the mist of hydrogen peroxide containing water is sprayed from the spray unit 2, the mist of hydrogen peroxide evaporates in the air in a short time by the action of the stirring fan 3 shown in FIG. It spreads evenly to every corner and can be decontaminated by dry method.

In condensation determination step of the step S4-2 shown in FIG. 3, the relative humidity phi decontamination is stopped in step S5, when it is determined that the control relative humidity phi _S or more. This decontamination stop operation is performed by the decontamination worker 15 pressing the forced stop switch 17, and when the forced stop switch 17 is pressed, the shutoff is performed via the selector 19 of the power control panel 11 shown in FIG. A shut-off command is forcibly output to the valve 6 and the shut-off valve 6 is closed. At the same time, an activation command is output from the abatement device controller 18 of the power control panel 11 to the abatement device 10, and the air in the room 1 is sucked into the abatement device 10, and the hydrogen peroxide mist-injected into the activated carbon is discharged. While being adsorbed and detoxified, air is discharged from the detoxifying device 10, and an alarm command is output to the dew condensation alarm device 20 to issue an alarm. As a result, it is reliably avoided that the interior of the room 1 and the equipment are corroded due to the condensation of hydrogen peroxide.

In step S6, when it is determined that the time t [min] from the start of decontamination has exceeded a set time t _set (for example, 240 [min] = 4 [hr]), decontamination is performed as step S7 at this time. Upon completion, the shutoff valve 6 is closed.

  In the present embodiment, the theoretical equations as shown in [Equation 1] to [Equation 7] are not calculated in real time each time, but instead of the assumed temperature θ of the room 1 printed on the form 16. Since the decontamination worker 15 can reliably determine whether or not dew condensation occurs by looking at the saturated vapor pressure diagram that is pre-calculated for each integer temperature value in the range and graphed, it is complicated within the power control panel 11. Compared with the dry-type decontamination method disclosed in Patent Document 1, the condensation determination can be performed very easily.

In the present embodiment, a graph is obtained by calculating in advance for each integer temperature value in the range of the assumed temperature θ of the room 1 printed on the form 16, and thereafter, the value of the axis of the relative humidity φ is set to a predetermined value. Since the displayed diagram is reduced, the expression is already shifted to the safe side by a predetermined value. By simply comparing the control relative humidity φ _S required by the display and the diagram, condensation can be reliably prevented.

  In addition, the predetermined disinfectant concentration Cs set so as to always maintain the indoor concentration is set as a setting range if it is set at 150 to 400 ppm which is a maintenance concentration at the time of decontamination of hydrogen peroxide as a decontamination. It is realistic and can be managed accurately.

  In addition, even if there is a nighttime air conditioning stop in the room 1 that handles microorganisms such as bacteria, substances that act on immunity of organisms, biological cells, etc., such as bioclean rooms in pharmaceutical manufacturing facilities and animal experiment facilities, the next day It is feasible enough to treat 15-30 ° C. at a room temperature that may rise in the morning and a certain degree of activity of microorganisms as the room temperature at the time of decontamination. Suitable for workers to use.

  Also, unlike conventional decontamination methods, the vaporization type vaporization apparatus that is indispensable for the generation of hydrogen peroxide vapor and is difficult to handle becomes unnecessary, and even without a specialized operator, the saturated vapor pressure line is eliminated. As long as there is a decontamination worker 15 who can see the form 16 on which the figure is printed, decontamination can be performed.

  In this way, the condensation determination can be easily performed, and the room 1 can be reliably decontaminated by a dry method without using a vaporization evaporation apparatus, and a specialized operator can be dispensed with.

  The decontamination method and apparatus of the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Indoor 2 Spray unit 3 Stirring fan 3a Outlet 5 Air piping 6 Shut-off valve 7 Thermometer 8 Hygrometer 9 Densitometer 10 Detoxifying device 11 Power control panel 12D Display part 13D Display part 14D Display part 15 Decontamination worker 16 Form 17 Forced stop switch C Hydrogen peroxide concentration (disinfectant concentration)
C _H1 hydrogen peroxide concentration upper limit setting value (disinfectant concentration upper limit setting value)
_CL0 hydrogen peroxide concentration lower limit setting value (disinfectant concentration lower limit setting value)
t time t _set time θ temperature φ relative humidity φ _S relative humidity or control relative humidity

Claims (15)

In the decontamination method of decontaminating indoors by spraying mist with a disinfectant containing water,
A measuring step for measuring the indoor temperature θ, the relative humidity φ, and the disinfectant concentration C;
A display step for displaying the temperature θ, the relative humidity φ, and the disinfectant concentration C measured in the measurement step;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A form preparation step for preparing a form that is output in the form of a graph that is previously calculated and graphed,
Based on the temperature θ displayed in the display step and the disinfectant concentration C, the control relative humidity φS is obtained based on the relative humidity φS where condensation occurs from the diagram prepared in the form preparation step, and the display step When it is determined that the relative humidity φ displayed at is lower than the control relative humidity φS, decontamination is performed, and when it is determined that the relative humidity φ is equal to or higher than the control relative humidity φS, the forced stop switch is operated. And a dew condensation determination step for stopping the decontamination. In the decontamination method of decontaminating indoors by spraying mist with a disinfectant containing water,
A measuring step for measuring the indoor temperature θ, the relative humidity φ, and the disinfectant concentration C;
A display step for displaying the temperature θ, the relative humidity φ, and the disinfectant concentration C measured in the measurement step;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A preparatory process for preparing a form that is pre-calculated and graphed, and then preparing a form that is output as a diagram that is displayed by reducing the value of the axis of relative humidity φ by a predetermined value;
Based on the temperature θ displayed in the display step and the disinfectant concentration C, the control relative humidity φS is obtained from the diagram prepared in the form preparation step based on the relative humidity φS at which condensation occurs, and the display When it is determined that the relative humidity φ displayed in the process is lower than the control relative humidity φS, decontamination is performed, and when it is determined that the relative humidity φ is equal to or higher than the control relative humidity φS, a forced stop switch is set. A dew condensation determination step of operating and stopping decontamination. The decontamination method according to claim 2,
The value of the axis of the relative humidity φ of the binary vapor disinfectant saturated vapor pressure line of the air disinfectant and water showing the relationship between the relative humidity φ and the disinfectant concentration C, which was calculated and graphed in advance. The decontamination method is characterized in that the predetermined value to be displayed by decreasing the value takes any value of 2 to 10%. The decontamination method according to any one of claims 1 to 3, wherein in the dew condensation determination step, it is determined that the relative humidity φ is lower than the control relative humidity φS, and the decontamination is performed when the forced stop switch is in an inoperative state. When performed, when the disinfectant concentration C is lower than a disinfectant concentration lower limit setting value C _L0 based on a predetermined disinfectant concentration Cs that is always set to be kept as an indoor concentration, the mist spray is performed, A decontamination method comprising: a mist spray start / stop step for stopping the mist spray when the disinfectant concentration C is equal to or greater than a disinfectant concentration upper limit set value C _H1 . The decontamination method according to claim 4,
The decontamination method, wherein the predetermined disinfectant concentration Cs is 150 to 400 ppm.   The decontamination method according to any one of claims 1 to 5, wherein the temperature θ is 15 to 30 ° C.   The decontamination method according to any one of claims 1 to 6, wherein the disinfectant is hydrogen peroxide. A thermometer for measuring the temperature θ of the room to be decontaminated ,
A hygrometer for measuring the relative humidity φ in the room;
A densitometer for measuring the disinfectant concentration C in the room;
A shut-off valve provided in the middle of an air pipe for supplying compressed air for spraying to the spray unit;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A form that was previously calculated and graphed, and a form that was output,
Power control panel,
The power control panel is
A display for displaying the temperature θ measured by the thermometer, the relative humidity φ measured by the hygrometer, and the disinfectant concentration C measured by the densitometer;
Based on the temperature θ displayed on the indicator and the disinfectant concentration C, the control relative humidity φS is obtained from the relative humidity φS at which condensation occurs from the diagram described in the form, and the power control panel When it is determined that the displayed relative humidity φ is equal to or higher than the control relative humidity φS, a forced stop switch for outputting a close command to the shutoff valve to stop decontamination and a relative value measured by the hygrometer When it is determined that the humidity φ is lower than the control relative humidity φS and the decontamination is performed while the forced stop switch is in the non-operating state, the disinfectant concentration C is set to a predetermined concentration that is always maintained as an indoor concentration. when lower than sterilization agent concentration lower limit set value C _L0 based on bacterial concentration Cs is by outputting an open command to the shut-off valve performs a mist spray, the disinfectant concentration C disinfectant concentration upper limit set value C _H1 or Closes to the shut-off valve And an automatic control system that outputs an open / close command to the shutoff valve according to the disinfectant concentration C measured by the densitometer so as to stop the mist spraying by outputting a command. Dyeing equipment. A thermometer for measuring the temperature θ of the room to be decontaminated ,
A hygrometer for measuring the relative humidity φ in the room;
A densitometer for measuring the disinfectant concentration C in the room;
A shut-off valve provided in the middle of an air pipe for supplying compressed air for spraying to the spray unit;
A binary vapor disinfectant saturated vapor pressure line of air disinfectant and water indicating the relationship between relative humidity φ and disinfectant concentration C is determined for each integer temperature value within the range of the assumed indoor temperature θ. A graph that is calculated in advance and graphed, and then output as a diagram showing the relative humidity φ axis reduced by a predetermined value,
Power control panel,
The power control panel is
A display for displaying the temperature θ measured by the thermometer, the relative humidity φ measured by the hygrometer, and the disinfectant concentration C measured by the densitometer;
Based on the temperature θ displayed on the indicator and the disinfectant concentration C, the control relative humidity φS is obtained from the relative humidity φS at which condensation occurs from the diagram described in the form, and the power control panel When it is determined that the displayed relative humidity φ is equal to or higher than the control relative humidity φS, a forced stop switch for outputting a close command to the shutoff valve to stop decontamination and a relative value measured by the hygrometer When it is determined that the humidity φ is lower than the control relative humidity φS and the decontamination is performed while the forced stop switch is in the non-operating state, the disinfectant concentration C is set to a predetermined concentration that is always maintained as an indoor concentration. when lower than sterilization agent concentration lower limit set value C _L0 based on bacterial concentration Cs is by outputting an open command to the shut-off valve performs a mist spray, the disinfectant concentration C disinfectant concentration upper limit set value C _H1 or Closes to the shut-off valve And an automatic control system that outputs an open / close command to the shutoff valve according to the disinfectant concentration C measured by the densitometer so as to stop the mist spraying by outputting a command. Dyeing equipment. The decontamination apparatus according to claim 9 ,
The value of the axis of the relative humidity φ of the binary vapor disinfectant saturated vapor pressure line of the air disinfectant and water showing the relationship between the relative humidity φ and the disinfectant concentration C, which was calculated and graphed in advance. The decontamination apparatus is characterized in that the predetermined value to be displayed by decreasing the value takes any value of 2 to 10%. The decontamination apparatus according to any one of claims 8 to 10 ,
The decontamination apparatus, wherein the predetermined disinfectant concentration Cs is 150 to 400 ppm. The decontamination apparatus according to any one of claims 8 to 11 , wherein the temperature θ is 15 to 30 ° C. The decontamination apparatus according to any one of claims 8 to 12 ,
Further equipped with a detoxification device for detoxifying the mist sprayed in the room,
A decontamination apparatus that outputs a start command from the power control panel to the detoxification apparatus. The decontamination apparatus according to any one of claims 8 to 13 , wherein the disinfecting agent is hydrogen peroxide. The decontamination apparatus according to any one of claims 8 to 14, wherein a stirring airflow that circulates along a wall surface of a room that is a decontamination target is generated in the same direction as the stirring airflow that circulates through the air outlet. A plurality of stirring fans installed toward the
  A spray unit that mist sprays a disinfectant containing water in the same direction as the circulating stirring airflow inside the circulating stirring airflow,
  By controlling the mist sprayed from the spray unit by the circulating agitating airflow in the room, the dehumidifying agent on the wall surface of the room is controlled by keeping the airflow of low humidity along the wall surface in the room. A decontamination apparatus.

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