JP2760909B2 - Fumigation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is, in particular, bio-CLEAN Le
The present invention relates to a fumigating treatment facility suitable for a room .

[0002]

2. Description of the Related Art Various types of fumigation gas are used for sterilization of a room by fumigation depending on the purpose. Methyl bromide, ethylene oxide, and the like are used for fumigation in museums and art galleries. Formaldehyde is frequently used as a fumigation gas. Formaldehyde is mainly generated by heating and evaporating formalin or by bringing methyl alcohol into contact with an oxidation catalyst.

[0003] In fumigation treatment with formaldehyde in a storage warehouse such as a silo, formalin in a tank is caused to flow out under pressure of nitrogen gas or the like, sent to a device for vaporizing formalin, and air is blown into the device for vaporization by a blower. This is done using equipment that introduces formaldehyde gas into the fumigation chamber.

[0004] On the other hand, the bioclean room must be disinfected before use, and for that purpose, fumigation treatment with formaldehyde has been conventionally performed. However, unlike a fumigation processing room for continuing fumigation processing for a long time, such as a storage warehouse, in the case of a bioclean room,
After the fumigation process, the fumigation gas must be exhausted to the outside immediately. Therefore, conventionally, an operator usually brings a fumigation gas generator into a bioclean room as needed to start generating fumigation gas. After the end of the fumigation process, the fumigation gas was forcibly exhausted to the outside by an exhaust fan without any treatment.

[0005]

As the [0005], in the prior art in fumigated bio clean room, Kun
At the start of steam gas generation, the operator must use a fumigation gas generator.
Must be brought into the bioclean room. Therefore, while the work is complicated, even if it is a short time,
Workers were at risk of exposure to toxic gases and there were concerns about safety. Also, directly discharging the fumigation gas harmful to the human body to the outside causes environmental pollution to the neighborhood, so it was necessary to dilute the fumigation gas to a harmless concentration and then exhaust it. In addition, when performing fumigating treatment, simply place a gas generator on the floor near the center of the processing chamber, and there is not enough air flow, so the fumes concentration distribution tends to fluctuate in the room, and the effect of fumigation depends on the place. However, there was an inconsistency. That is,
In the conventional fumigation treatment of a bioclean room, there have been problems in improving the complexity of work, ensuring worker safety, eliminating environmental pollution, and ensuring uniform treatment effects.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a fumigating equipment according to the present invention is provided with
Formaldehyde gas that has been heated and vaporized
Fumigation gas supply to the fumigation processing chamber via a flow passage
Through device and the said fumigation process chamber gas the second flow passage channel
And discharge and discharge the exhaust gas through a third flow passage.
To the vaporization and mixing section of the fumigation gas supply device
And a fourth flow branched from the third flow passage.
A blower that discharges and supplies the first flow passage through a passage
And the fumigation chamber interposed in the second flow passage
To detect the formaldehyde concentration of the gas discharged from
Discharge device after branching from the second flow passage
Removal device for removing formaldehyde contained in gas
A branch that merges into the second flow passage through
The formaldehyde concentration obtained by the detector
From the fumigation chamber until the set value is reached
The discharged gas is passed through the second flow passage, the blower,
A third flow passage, the vaporization / mixing section and the first flow passage
And circulate through the fumigation chamber through the
After reaching the set value, the gas discharged from the fumigation chamber
The second flow passage, the branch passage, the blower,
The fumigation through a fourth flow path and the first flow path;
Circulating the exhaust gas so as to circulate it into the processing chamber.
Switching means for switching, the first flow passage and the second
2 flow passages can be attached to and removed from the fumigation chamber from outside
Connection means for connecting freely .

[0007]

[0008] Further, the removing device may include an oxidizing agent and / or an oxidizing agent.
Alternatively, it is preferable that the fumigation gas component is removed from the gas in the fumigation processing chamber by an adsorbent.

[0009]

According to the present invention, after the end of the fumigation process, the gas in the fumigation process chamber is passed through a removing device for removing fumigation gas components. The gas in the processing chamber after the end of the fumigation process is a component gas of the concentration necessary for the fumigation process,
By being introduced into the removing device little by little, it becomes a gas containing almost no fumigation gas component.

The method of removing the fumigant gas component in the removing device may be a wet method or a dry method as generally used depending on the type of the chemical used as the fumigant gas. The following method is preferred. That is, formaldehyde is converted to formic acid using an oxidizing agent such as potassium permanganate and fixed. For example, a dry method in which formaldehyde is fixed or oxidatively decomposed by an oxidizing absorbent containing potassium permanganate as a main component. Alternatively, there is a method of physically adsorbing formaldehyde to an adsorbent such as activated carbon. If the filling amount is sufficiently large, it is possible to obtain the required removal performance with only one of the oxidizing agent and the adsorbent. By using an oxidizer and an adsorbent together,
Almost completely removed. The formaldehyde concentration required for fumigation treatment in the bioclean room is usually 5000 pp
m, which is harmless to the human body after fumigation
Formaldehyde must be removed to a concentration below ppm. When formaldehyde is removed from high-concentration formaldehyde gas immediately after the end of the fumigation process, if the adsorbent is used alone, formaldehyde once adsorbed may be desorbed. Therefore, when treating a formaldehyde gas having a high concentration, it is desirable to adopt a removal method using both an oxidizing agent and an adsorbent.

Further, in the present invention, after the fumigation process is completed, the gas in the processing chamber passes through the removing device little by little in a gas stream, removes the contained chemical component, and enters the processing chamber again. To generate the airflow, a blower used to supply fumigation gas into the processing chamber can be used. As described above, by repeatedly discharging a gas containing a high concentration of a drug component and introducing a gas containing almost no drug component, the drug concentration in the fumigation chamber is reduced to a level harmless to the human body. .

[0012]

The fumigant gas supply device constituting the fumigation treatment equipment of the present invention supplies formaldehyde gas, which is obtained by heating and vaporizing formalin, into a room where the fumigation treatment is performed. The generation of fumigation gas can be performed by a normal generation method, but it is desirable to employ the following method. In other words, it is composed of a chemical liquid tank containing formalin, an inert gas cylinder for pressurization, a flow meter, a blower, a vaporizer for vaporizing formalin and mixing the generated formaldehyde gas with the air sent by the blower, and a drain separator. Equipment used. The formalin in the chemical solution tank is pressurized with an inert gas such as nitrogen gas while adjusting the flow rate of formalin to a required set amount, and sent to the vaporization mixer. If this vaporization mixer has a structure in which a heater for heating is provided outside the vaporization section,
Explosion due to high concentrations of formalin is avoided. The air sent into the vaporizing mixer sends formaldehyde gas and the like in the vaporizing mixer to the drain separator. Formalin that has not been vaporized is separated by a drain separator and discharged, and formaldehyde gas is supplied to a fumigation processing chamber. At this time, since the formaldehyde gas is supplied into the processing chamber by the airflow from the blower, an airflow is generated in the processing chamber.

On the other hand, fumigation treatment with formaldehyde is particularly effective in an atmosphere having a relative humidity of 80% or more. In the fumigation gas supply apparatus as described above, it is possible to dilute commercially available formalin into a tank, generate and supply a large amount of water vapor simultaneously with formaldehyde, and adjust the relative humidity in the processing chamber. In that case, it is necessary to increase the heater capacity of the vaporization mixer in order to vaporize a large amount of water.

[0015] The gas detection device constituting the fumigation processing equipment of the present invention is a fumigation processing chamber, while supplying fumigation gas and passing gas in the fumigation processing chamber to remove formaldehyde. The formaldehyde concentration is monitored to notify that each set concentration has been reached. This gas detection device is installed immediately after the exhaust port of the fumigation processing chamber and immediately before the removal device. Commercially available formalin usually contains about 10-15% of methyl alcohol to keep formaldehyde stable. Therefore, the fumigant gas supplied into the processing chamber by the fumigation gas supply device also contains a methyl alcohol gas. Therefore, this gas detection device needs to detect the concentration of formaldehyde by a method that does not cause a malfunction due to the presence of a substance other than formaldehyde.
In addition, two types of detection methods are adopted according to each purpose in order to perform high-concentration gas detection when fumigation gas is supplied and low-concentration gas when formaldehyde is removed. That is, a light interference method for detecting high concentration formaldehyde and a constant potential electrolysis method for detecting low concentration formaldehyde are used in combination. While supplying the fumigation gas, the formaldehyde concentration is detected by the light wave interference method, and while the gas in the fumigation processing chamber is passed through the removal device to remove the formaldehyde, the detection is performed by the potentiostatic electrolysis method.

The removing apparatus constituting the fumigating treatment equipment of the present invention is an apparatus for achieving the above-mentioned method for removing fumigation gas, and is preferably filled with an adsorbent such as an oxidizing absorbent and / or activated carbon. It is. After the end of the fumigation treatment, the gas in the fumigation treatment chamber enters the removing device, and after formaldehyde is almost completely removed, the gas enters the fumigation treatment chamber again and circulates. The removal device is operated in a room at room temperature, but it is necessary to provide a cooling coil in case the temperature inside the device increases due to heat of reaction and heat of adsorption during operation.

The fumigation treatment equipment of the present invention as described above can be operated by automatic control by connecting a fumigation gas supply device, a gas detection device, a removal device, and a blower with a motor damper. In that case, the gas detection device is configured to automatically switch to the light wave interference method when the fumigation gas is supplied and to the constant potential electrolysis method when the removal device is activated.

[0018]

The present invention will be described below in detail with reference to examples. FIG.
1 is an embodiment of the fumigation equipment of the present invention.

This fumigation equipment heats formalin
Formaldehyde gas vaporized by the first flow path A
Fumigation gas supply device for supplying to the fumigation processing chamber 15 through the
And the gas in the fumigation chamber 15 through the second flow path B.
And discharge and discharge the exhaust gas into a third passage C
Through the vaporization mixer (vaporization mixing) of the fumigation gas supply device
Discharge / supply to the joint portion 4 and from the third flow passage C
Discharge to the first flow passage A via the branched fourth flow passage D
・ In the supply blower (blower) 6 and the second flow passage B
The gas reservoir discharged from the fumigation chamber 15
A gas detection device 7 for detecting the concentration of
After diverging from the flow passage B, the form contained in the exhaust gas
The second flow through the removal device 8 for removing aldehyde
Obtained by the branch E which joins the road B and the gas detector 7
Formaldehyde concentration to a preset value
Until the gas reaches the fumigation chamber 15,
Second flow path B, blower 6, third flow path C, vaporization and mixing
Through the vessel 4 and the first passage A to the fumigation chamber 15
In addition to the ring supply, after reaching the set value, fumigation
The gas discharged from the science room 15 is supplied to the second flow path B and the branch path.
E, the blower 6, the fourth flow path D and the first flow path A
The discharge so as to circulate through the fumigation chamber 15
Each damper (switching means) 9 for switching the gas circulation path
, And the first flow path A and the second flow path B, respectively.
Connection for detachably connecting to the fumigation chamber 15 from outside
Valves (connection means) 16 and 17 are provided. The fumigation gas supply device includes a gas cylinder 1 containing nitrogen gas, a chemical solution tank 2 containing formalin, a flow meter 3 having a needle valve 3a, a vaporizer 4 and a drain separator 5.
You . Nitrogen gas is connected to the existing nitrogen line and damper 1
8 may be supplied. The drain separator 5 has the first
Is connected to one end of the first flow passage A.
The other end of A is connected to a fumigation chamber 15 through a connection valve 16.
Is connected detachably from the outside to the gas inlet 15a.
You. Interposed in the first passage A while the blower 6 is driven
Damper 9 and damper 1 interposed in the third flow passage C
When the valve 0 and the connection valve 16 are opened, the fumigation gas is introduced into the processing chamber 15 from the gas inlet 15a. Second channel
One end of B is connected to the suction section of the blower 6,
The other end of the second flow passage path B is kun via a connection valve 17
Externally detachable from the gas outlet 15b of the steaming chamber 15
It is connected. Further, one end of the third flow passage C is blown.
And the third flow passage C
The other end is connected to the vaporizer 4. In addition, the fourth
The flow passage D has one end connected to the valve 10 of the third flow passage C.
The other end is connected to the lower
Connected between the valve 9 in the passage A and the connection valve 16
You.

The gas detector 7 is connected to the second flow path B.
It is installed immediately after the valve 17 . Connection valve 17,
A gas interposed between the gas detection device 7 and the second flow passage B
Between the blower 6 and the gas detector 7
When the damper 13 interposed in the second flow passage B is opened, the gas in the fumigation chamber 15 is blown by the blower 6 to the gas detector 7.
Therefore, the formaldehyde concentration of the gas in the processing chamber can be detected. This gas detection device 7 is a detector using both a light interference method for detecting high-concentration formaldehyde and a constant potential electrolysis method for detecting low-concentration formaldehyde. Can be switched.

The branch path E includes the damper 13 and the gas detector 7.
After branching from the second flow passage B between the damper 13 and
It joins with the blower 6 to the second flow passage B,
A removal device 8 is interposed in the branch E. Removal device 8
Is filled with pure light (trade name), an oxidation absorbent containing potassium permanganate as a main component, and activated carbon. When the removing device is in operation, the dampers 9, 10, and 13
Is closed , the damper 1 interposed in the fourth flow path D
1. A dam interposed downstream of the removing device 8 in the branch E
Pa 12, and branch path interposed upstream of the removal device 8 E
The damper 14 is opened. As a result, the gas from which the formaldehyde has been removed by the removal device 8 flows into the gas inlet 1
It enters into the fumigation processing chamber 15 from 5a.

The fumigation method using this fumigation equipment will be described below. Connect the other end of the first flow passage A
When connected to the gas inlet 15a via the valve 16,
The other end of the second flow passage B is connected via a connection valve 17.
Connect to gas outlet 15b. Connection valves 16 and 1
7, and the dampers 9, 10, and 13 are opened, and after the blower 6 is started, the heater of the vaporization mixer 4 is turned on. The gas detection device 7 is set to the light wave interference method, and is set and operated so as to detect the fumigation concentration (for example, 5000 ppm). The formalin in the chemical solution tank 2 is pressurized with nitrogen in the gas cylinder 1 and sent to the vaporizer 4 while adjusting the needle valve 3 a of the flow meter 3 so that the formalin flow rate becomes a required set amount. This vaporizer 4
Vaporizes formalin to generate formaldehyde. The vaporization mixer 4 has an explosion-proof structure in which a heating heater is provided outside the vaporization section 4a, and is provided with a temperature controller 4b. Air is supplied into the vaporization mixer 4 by the blower 6, and sends formaldehyde gas and the like in the container into the drain separator 5. In the drain separator within 5, formalin was not vaporized is discharged is separated, after which only the gas is supplied to the fumigation chamber 15 from the gas inlet port 15a via the first flow passage A, moth
Discharged from the outlet 15b. The exhaust gas is
Flow through path B, the blower 6, the third flow path C, vaporizer mixer 4
And circulates through the first flow passage A into the fumigation processing chamber 15.
Supplied. The fumigation gas supplied into the fumigation processing chamber 15 causes an airflow in the fumigation processing chamber 15 to force convection of the air in the room. During that time, the formaldehyde concentration of the gas in the fumigation chamber is monitored by the gas detector 7. When the gas detector detects the set concentration, the gas cylinder 1 is closed, the heater of the vaporization mixer 4 is turned off, and the blower 6 is stopped. Then, dampers 9, 10 and 1
3 is closed, and fumigation treatment is performed for a certain period of time.

When the fumigation process is completed, the dampers 11, 1
2, and 14 are opened to start the blower 6. Also,
The detection method of the gas detection device 7 is switched to the constant potential electrolysis method, and the formaldehyde removal completion concentration (for example, 1 pp
m) is set. As a result, the gas is discharged from the gas discharge port 15b.
The discharged gas in the fumigation processing chamber 15 passes through the second flow passage B.
During the flow, the formaldehyde concentration is detected by the gas detector 7
While flowing into the fork E, and enters the removing device 8. The gas from which formaldehyde has been removed by the removal device 8 joins the second flow path B, and then is blown.
-6, through the fourth flow passage D and the first flow passage A of the circulation again supplied to the fumigation chamber 15 from gas inlets 15a
Is done . As described above, the gas in the processing chamber 15 is circulated, and when the gas detection device 7 detects the set concentration, the blower 6 is stopped. Finally, the dampers 11, 12, and 1
Close 4. When fumigation another room next time, the connection valves 16 and 17 are closed and the first and second flow passages are closed .
The other end of each of A and B is connected to the gas inlet 15a and the gas outlet 1
5b, the gas inlet 15a of another fumigation chamber and
Each of the first and second flow passages A and B is
The other end is connected in the same manner as above.

The fumigation processing equipment of this embodiment can be operated under automatic control by connecting a fumigation gas supply device, a gas detection device, a removal device, and a blower with a motor damper. In this case, the gas detector is configured to automatically switch to a detector using the light wave interference method when the fumigation gas is supplied, and to a detector using the constant potential electrolysis method when the removal device is activated.

Further, an experiment was conducted as follows to examine the performance of the removing device constituting the fumigation equipment of the present embodiment. That is, the oxidizing absorbent and the activated carbon were filled in the removal device under each condition, and formaldehyde gas having a concentration of 5000 ppm was passed through the device, and the outlet concentration was measured. Oxidation absorber is Nippon Chemical Industries Pure Light E
2. Activated carbon is crushed activated carbon 4GCX manufactured by Tsurumi Coal
Was used. Table 1 shows these filling conditions and the results of the removal performance.
Shown in In Table 1, the SV value means the processing air volume per hour with respect to the total volume of the filler. Further, the removal efficiency means a ratio of a value obtained by subtracting the outlet concentration after the treatment from the initial concentration (5000 ppm) to the initial concentration.

[0026]

[Table 1] From the results shown in Table 1, it can be seen that the fumigation gas removing method of the present invention can sufficiently cope with fumigation treatment using a high-concentration formaldehyde gas such as a bioclean room by using an oxidizing agent and an adsorbent in combination.

[0027]

As described above, as described above, the fumigation process of the present invention
According to the processing equipment, the gas in the processing chamber after the end of the fumigation process is passed through the removing device to be introduced again into the processing chamber as a gas containing almost no drug component, and circulated. Thereby, the concentration of the chemical gas in the processing chamber is diluted to a level harmless to the human body, so that no harmful gas is discharged to the outside and there is no concern about environmental pollution.

Further, when fumigation processing is performed using the fumigation processing equipment of the present invention, the equipment can be brought into a room,
Since there is no need to take it out from the inside, the complexity of the conventional fumigation process is improved ,
Since there is no need to enter , the safety of workers is also ensured.
This effect is greater when the fumigation equipment of the present invention is operated unattended by automatic control. Change
In addition, since the equipment is installed outside the room,
Without having to consider the size of the entrance and the size of the equipment itself
And the degree of freedom in equipment design can be improved.
You.

Further, when fumigation processing is performed using the fumigation processing equipment of the present invention, fumigation gas is supplied into the processing chamber by the airflow from the air from the blower . The fumigation gas spreads evenly to every corner, and a highly reliable fumigation treatment effect can be obtained. Further, the gas discharged from the fumigation processing chamber is supplied to the second stream.
A passage, a blower, a third flow passage , a vaporization mixing section, and a first flow
At the time of fumigation processing, which is circulated through the passage to the fumigation processing chamber
Of the circulation path of the second, the second flow path, the branch path, the blower,
To the fumigation chamber via the fourth flow path and the first flow path
Both the circulation system drive after the fumigation process and the circulation supply
Since it can be performed with a single blower, the equipment can be downsized.
And reduce costs.
it can.

In addition, when the fumigation treatment is performed using the fumigation treatment equipment of the present invention, the relative humidity in the treatment chamber can be adjusted by adjusting the dilution concentration of formalin. It is also possible to maximize the fumigation effect.

The fumigation processing equipment of the present invention comprises a fumigation gas supply device, a fumigation gas concentration detection device, and first to fourth circulations.
Roads, branch roads, blowers and fumigation gas removing devices are installed collectively, and equipment management is simplified.
In addition, the first flow path and the second flow path are connected to the fumigation processing chamber.
Because it is detachably connected by connection means from the outside,
A plurality of bioclean rooms and first and second flow passages;
By connecting , increase the frequency of use of equipment and use it efficiently
Can be done .

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of a fumigation treatment facility of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 gas cylinder 2 chemical liquid tank 3 flow meter 4 vaporizer (vaporizer mixer) 4a vaporizer 4b temperature controller 5 drain separator 6 blower (blower) 7 gas detector 7a damper 8 remover 9-14 damper (switcher) 15 Fumigation chamber 15a Gas inlet 15b Gas outlet 16 Connection valve (connection means) 17 Connection valve (connection means) 18 Damper A ... First flow path B ... Second flow path C ... Third flow path D ... Fourth flow path E: branch path

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masayuki Imafuku 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Tetsuo Jimbo 2-8-5 Kanumadai, Sagamihara City, Kanagawa Prefecture (72) Inventor Yukihiko Ogata 2-17-7 Nitta, Ichikawa-shi, Chiba (56) References JP-A-61-203968 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61L 2/20

Claims (1)

(57) [Claims] 1. A form which is obtained by heating and vaporizing formalin.
Aldehyde gas to fumigation chamber through first flow passage
A fumigation gas supply device for supplying, and
Gas is sucked and discharged through the second flow passage, and
The fumigation gas supply device through a third flow passage
Discharge and supply to the vaporization section of the
Discharges into the first flow passage via a fourth flow passage branched from the first flow passage.
An outlet / supply blower interposed in the second flow passage
Formaldehyde from the gas discharged from the fumigation chamber
A gas detection device for detecting a gas concentration,
Formaldehyde in the exhaust gas after branching
Merging into the second flow passage via a removing device for removing
A fork and a forma obtained by the gas detector
Before the aldehyde concentration reaches the predetermined set value,
Passing the gas discharged from the fumigation processing chamber to the second circulation
Path, the blower, the third flow path, the vaporizer and the front
Circulating the fumigation chamber through the first flow passage;
After reaching the set value, the fumigation chamber
The gas discharged from the second passage , the branch,
The blower, the fourth flow passage and the first flow passage
Circulates through the fumigation chamber through the discharge
Switching means for switching a gas circulation path;
A flow path and the second flow path, respectively,
Connection means for detachably connecting to the room from the outside.
And fumigation processing equipment.