JPH11225654A - Method and device for preventing harmful effect of fumigation agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for preventing harmful effects of fumigation gases to articles positioned in a fumigating space. SOLUTION: This method for preventing harmful effects of fumigation agent contains a process, which is to cover an article positioned in a fumugating space 20 with a gas-impermeable covering material 29 and partition an isolated space around the article, a process which is to arrange an air bag 21 filled with a noncorrosive gas, e.g. air, in the fumigating space 20 and a process, which is to supply the noncorrosive gas little by little in the air bag 21 into the isolated space when closing the fumigating space 20 and filling the space with the fumigating gas. The process in which the noncorrosive gas in the air bag 21 is gradually supplied to the isolated space comprises a process for supplying the noncorrosive gas to the isolated space by a blast pump 23. The corrosive gas supplied to the isolated space is discharged little by little to the fumigating space. For the purpose, an escape tube 12 for communicating the isolated space with the fumigating space is installed. The isolated space is partitioned not only by a partition wall between the fumigating space and the outside and the covering material, but bringing the covering material to a bag shape for housing the article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing harmful effects of fumigants on articles in a fumigation space filled with fumigant gas generated from fumigants.

[0002]

2. Description of the Related Art Grains, live plants, wood, etc.
In order to prevent damage to tobacco and the like, fumigation of them with a fumigation gas has been conventionally performed. In addition, fumigation treatment is also performed to prevent damage to arts and crafts due to insects and molds. These fumigation treatments are performed not only in dedicated fumigation treatment warehouses, but also in places where there is an article with properties such as deterioration, rust, deterioration, etc. when exposed to fumigation gas. There are cases.

[0003] The phytotoxicity of fumigants occurs, for example, in the following cases. If a gas containing hydrogen phosphide is used as a fumigation gas, copper and copper alloys will be corroded by hydrogen phosphide, resulting in failure and damage to electrical products and cultural properties that use copper and copper alloys. . Further, when a gas containing methyl bromide or a mixture of methyl bromide and ethylene oxide is used, there is a chemical injury that causes deterioration of raw plants, some of fruits and vegetables, photographic materials, wool, grass, rubber products and the like. In the past, to avoid harm from fumigants, items that could be harmful were previously removed from the fumigation area or covered with a vinyl sheet to protect them. There was a problem that was not made.

Japanese Patent Publication No. Hei 7-99987 discloses that an air bag is provided in a sealed fumigation body (fumigation space), and the air in the air bag is drawn out of the fumigation body so that the fumigation body is maintained at normal pressure. A method and apparatus for supplying fumigant gas into a fumigant to prevent toxic fumigant gas from leaking from the fumigant is disclosed.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional methods for preventing fumigant phytotoxicity and to provide a method and equipment for reliably preventing fumigant phytotoxicity. An article located in the fumigation space is covered with a gas-impermeable covering material to define an isolated space around the article, and the fumigation is performed so that the isolated space is filled with a non-corrosive gas during the fumigation process. An object of the present invention is to provide a method and equipment for surely preventing harm of an agent. Another object of the present invention is to dispose an airbag filled with a non-corrosive gas in a fumigation space, and supply the non-corrosive gas in the airbag to the isolated space little by little, so that the isolated space is not corroded. Regardless of the supply of toxic gas, a method and equipment that does not cause gas to flow into and out of the entire fumigation space and the outside, and therefore prevent toxic fumigation gas from leaking out of the fumigation space. To provide. Another object of the present invention is to ensure that the isolated space is filled with non-corrosive gas by constantly discharging a small amount of non-corrosive gas from the isolated space to the fumigation space during the fumigation process. Other objects and advantages of the present invention will become apparent from the following description.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for preventing harmful effects of a fumigant on an article located in a fumigation space, comprising covering the article located in the fumigation space with a gas-impermeable coating material. A non-corrosive gas in the air bag when the fumigation space is filled with fumigation gas when the fume space is filled with a non-corrosive gas. The method includes a step of supplying a small amount to a space, and may further include the following configuration.

(A) The airbag is formed of a flexible material and has a volume reduced according to the amount of non-corrosive gas supplied to the isolated space from the airbag. (B)
The gas impermeable coating is a flexible sheet. (C)
The step of supplying the non-corrosive gas in the air bag to the isolated space little by little comprises the step of supplying the non-corrosive gas to the isolated space by a blower pump. (D) The blower pump is disposed outside the fumigation space, and a hose connecting the airbag and the blower pump and a hose connecting the blower pump and the isolation space respectively penetrate the partition wall between the fumigation space and the outside world. Placed. (E) The fumigation gas is hydrocyanic acid gas or hydrogen phosphide. (F) Articles located in the fumigation space,
It has a metal surface. (G) The non-corrosive gas is air. (H) The non-corrosive gas supplied to the isolated space is discharged little by little from the isolated space into the fumigation space.
(H) The non-corrosive gas supplied to the isolated space is discharged little by little from the isolated space into the fumigation space via the release tube. (I) The isolation space is defined by a partition wall and a covering material between the fumigation space and the outside world. (J) The isolated space is defined by making the covering material into a bag shape.

An apparatus for preventing harmful effects of a fumigant on an article in a fumigation space which is filled with fumigant gas generated from the fumigant of the present invention covers the article located in the fumigation space and isolates the article around the article. A gas-impermeable coating material for partitioning a space, an airbag disposed in a fumigation space and capable of being filled with a non-corrosive gas, a blower pump having a suction port connected to the airbag, and a discharge port of the blower pump A gas branch pipe, a regulator, and a distribution passage communicating the isolation space with the gas branch pipe. The regulator is
It is arranged in the distribution passage, and adjusts the flow rate of the non-corrosive gas supplied from the airbag to the isolation space by the blower pump. The equipment of the present invention can have the following configuration.

(K) The airbag is formed of a flexible material and has a volume reduced according to the amount of non-corrosive gas supplied from the airbag to the isolation space. (L)
The gas impermeable coating is a flexible sheet. (M)
The blower pump is arranged outside the fumigation space, and a hose communicating the airbag and the blower pump, and a hose communicating the blower pump and the isolation space, respectively, are arranged penetrating the partition wall between the fumigation space and the outside world. Is done. (N) The fumigation gas is hydrocyanic acid gas or hydrogen phosphide. (O) The non-corrosive gas is air. (P) The non-corrosive gas supplied to the isolation space is discharged little by little from the isolation space into the fumigation space via the release tube.

[0010]

The article located in the fumigation space is covered with a gas-impermeable covering material to define an isolated space around the article. Corrosive gas ensures isolation from fumigation gas,
The occurrence of phytotoxicity is avoided. The airbag, which is located in the fumigation space and is filled with a non-corrosive gas, supplies the non-corrosive gas in the airbag to the isolated space and keeps the isolated space filled with the non-corrosive gas to ensure prevention of chemical damage. In the fumigation process where a certain amount of fumigation gas is maintained in the fumigation space, when non-corrosive gas in the airbag is moved to the isolation space, the increase in the volume of the isolation space decreases the volume of the airbag in the fumigation space. Offset by Therefore, no change in volume or pressure of the fumigation gas in the fumigation space occurs, and no toxic fumigation gas leaks from the fumigation space to the outside.

The non-corrosive gas supplied to the isolated space is discharged little by little from the isolated space into the fumigation space via the escape tube. The escape tube maintains the fumigant gas concentration in the isolated space to a minimum by discharging and replacing the non-corrosive gas in the isolated space in small increments, ensuring that the fumes are not harmed to articles in the isolated space.

When the blower pump is disposed outside the fumigation space, a hose connecting the airbag and the blower pump and a hose connecting the blower pump and the isolation space respectively penetrate the partition wall between the fumigation space and the outside world. However, it is possible to adjust the blower pump without entering the fumigation space.

[0013]

FIG. 1 is a perspective view of a facility for carrying out the method of the present invention, and FIG. 2 is a partial sectional layout of the facility of FIG. The equipment of FIGS. 1 and 2 is provided with an article 1 located in the fumigation space 20 in order to prevent harm of the fumigant to the articles 11, 11 located in the fumigation space 20.
A gas-impermeable covering material 29, 29 for covering and surrounding an enclosure 1 and 11 and defining an isolation space 30 therearound, a fumigation space 20
Airbag 2 which is arranged in the inside and can be filled with a non-corrosive gas
1. A suction pipe 22 that communicates the air bag 21 with a suction port of a blower pump 23, a discharge pipe 24 that communicates a discharge port of the blower pump 23 with a branch pipe 25, and a distribution passage 28 that communicates the branch pipe 25 with the isolation space 30. , 28 and a regulator 26 arranged in each distribution passage 28, 28.

The branch pipe 25 is configured to also serve as an air reservoir. The fumigation space 20 is constituted by a closed space partitioned by the partition wall 19. A fumigation gas, for example, hydrocyanic acid gas or hydrogen phosphide gas, is supplied to the fumigation space 20 by means not shown, and fumigates the target article to be fumigated. The non-corrosive gas filled in the airbag and supplied to the isolation space 30 is typically air. The regulator 26 regulates the flow rate of the non-corrosive gas flowing from the airbag 21 to the isolation space 30. The airbag 21 is formed of a gas impermeable flexible material such as a vinyl sheet and a polyethylene sheet.

The volume of the airbag 21 is reduced according to the amount of non-corrosive gas supplied from the airbag 21 to the isolation space 30. The blower pump 23 has a case where it is arrange | positioned in the fumigation space 20 (FIGS. 1, 2) and a case where it is arrange | positioned outside the fumigation space 20 (FIG. 3). The non-corrosive gas supplied to the isolated space 30 is discharged little by little from the isolated space 30 into the fumigation space 20 via the escape tube 12. Therefore, in the isolated space 30, even a small amount of fumigation gas entering the isolated space from the gap between the coating materials does not remain in the isolated space,
Since the inside of the isolated space 30 is always filled with the non-corrosive gas,
Articles in the enclosure are not affected by the fumigant.

FIG. 3 is a perspective view of another facility for carrying out the method of the invention, in which a blow pump 23 is shown.
And related equipment are arranged outside the fumigation space 20. 1, 2, and 3, the same reference numerals indicate similar members, and redundant description will be omitted. In the equipment of FIG.
Suction pipe 2 connecting airbag 21 and blower pump 23
2. A plurality of distribution pipes 28 connecting the regulator 26 and the isolation space 30 penetrate the partition wall 19.

The equipment shown in FIG. 3 includes a fumigant source 40 and a vaporizer 42. The fumigant supplied from the fumigant source 40 is vaporized by the vaporizer 42, and the fumigation space 2 is used as fumigation gas.
0. By discharging the non-corrosive gas in the airbag 21 corresponding to the amount of the fumigation gas supplied to the fumigation space 20 to the outside of the fumigation space 20, the fumigation space 20 is discharged.
It is possible to prevent the pressure from increasing by making the total amount of gas in the inside constant, and to minimize leakage of toxic fumigation gas from the fumigation space 20 to the outside. When fumigation gas is filled and maintained in the fumigation space 20 for the fumigation process, the air bag 21
The air inside is separated by a small amount by the blower pump 23 into each isolation space 3.
0.

The equipment shown in FIG. 3 includes a safety valve 26. When the pressure in the isolation space 30 becomes higher than the pressure in the fumigation space 20, the safety valve 26 performs a discharge operation to activate the branch pipe 2.
The gas in 5 is discharged into the fumigation space 20 to prevent the seal of the isolated space from breaking. Further, when the discharge operation of the safety valve 26 occurs, a signal indicating the discharge operation is transmitted to the controller 32 via the conductor 33, and an operation stop signal is transmitted from the controller 32 to the blower pump 23 via the conductor 34.

The method of the present invention for preventing the fumigation agent from damaging the articles located in the fumigation space is shown in FIGS.
A step of covering the article 11 located in the fumigation space 20 with a gas-impermeable covering material 29 to define an isolated space 30 around the article; Arranging the airbag 21 filled with a non-corrosive gas, for example, air containing no fumigation gas, and when filling the fumigation space 20 with a closed fumigation gas, the non-corrosive gas in the airbag 21 is isolated from the isolation space 30. To a small amount.

In the method of the present invention, the step of supplying the non-corrosive gas in the air bag 21 to the isolation space 30 little by little is performed by supplying the non-corrosive gas to the isolation space 30 by the blower pump 23.
And supplying to The non-corrosive gas supplied to the isolated space is discharged little by little from the isolated space into the fumigation space. Therefore, a small-diameter relief tube communicating the isolation space and the fumigation space is provided. The isolation space 30 is defined by a partition wall between the fumigation space and the outside world and a coating material, and is also formed by forming the coating material in the form of a bag for storing the article 11.

[0021]

According to the method or equipment for preventing phytotoxicity of the present invention, articles affected by fumigation gas or the like are isolated from the fumigation gas by the coating material that defines the isolated space, and non-corrosive gas is removed. Since it is supplied to the isolated space for storing the articles and puts the isolated space in a positive pressure state, it is possible to reliably prevent the fumigation gas from entering the isolated space. Articles are protected from being moved from the installation site. The non-corrosive gas in the variable-volume airbag installed in the fumigation space before the fumigation process is supplied to the variable-volume isolated space in the fumigation space, and the gas volume in the fumigation space regardless of the supply of the non-corrosive gas The fumigation space does not change in pressure and does not increase the pressure, so the sealing of the fumigation space is easy to break without breaking and the amount of toxic fumigation gas leaking from the fumigation space to the surroundings can be minimized. it can. When the blower pump is disposed outside the fumigation space, there are advantages such that interaction between the pump driving motor and the fumigation gas can be avoided, and operation control and the like can be performed from outside the fumigation space. When the escape tube is provided in the isolated space, the action of the fumigant gas on the articles in the isolated space can be more reliably prevented by replacing the non-corrosive gas in the isolated space. In addition, when the air reservoir is provided, a non-corrosive gas at a constant pressure can be supplied to the isolated spaces of different sizes, and the prevention of chemical damage to articles stored in the isolated spaces can be ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a facility for performing the method of the present invention.

FIG. 2 is a partial cross-sectional layout view of equipment for performing the method of the present invention.

FIG. 3 is a perspective view of another facility for performing the method of the present invention.

[Explanation of symbols]

11: article, 12: relief tube, 20: fumigation space, 21: air bag, 22: suction pipe, 23: blower pump, 25: branch pipe, 26: safety valve, 27: regulator, 28: distribution pipe, 29: coating Lumber, 30: isolated space, 4
0: fumigant source, 42: vaporizer.

Claims (12)

[Claims] 1. A method for preventing harmful effects of a fumigant on an article located in a fumigation space, wherein the article located in the fumigation space is covered with a gas-impermeable covering material to surround the article. A step of partitioning the isolated space, a step of arranging an airbag filled with a non-corrosive gas in the fumigation space, and, when filling the fumigation space with a closed fumigation gas, removing the non-corrosive gas in the airbag into the isolation space. A method including a step of supplying a small amount to 2. The gas bag according to claim 1, wherein the air bag is formed of a flexible material and has a volume reduced according to an amount of a non-corrosive gas supplied from the air bag to the isolation space. The covering material is a flexible sheet, and the step of supplying the non-corrosive gas in the airbag to the isolation space little by little comprises supplying a non-corrosive gas to the isolation space by a blower pump. Item 1. The method of Item 1. 3. The fume pump is disposed outside the fumigation space, and a hose that connects the airbag and the blow pump and a hose that communicates the blow pump and the isolation space each have a partition between the fumigation space and the outside world. 3. The method of claim 1 or 2, wherein the method is disposed through a wall. 4. The fumigation gas is a hydrocyanic acid gas or a hydrogen phosphide gas, the article located in the fumigation space has a metal surface, and the non-corrosive gas is air. 3. The method according to any one of 3. 5. The method according to claim 1, wherein the non-corrosive gas supplied to the isolated space is discharged little by little from the isolated space into the fumigation space. 6. The non-corrosive gas supplied to the isolation space is discharged little by little from the isolation space into the fumigation space via the release tube.
Term method. 7. The isolated space is defined by a partition wall and a covering material between the fumigation space and the outside world.
The method according to any one of the preceding claims. 8. The method according to claim 1, wherein the isolation space is defined by bagging the covering material. 9. An apparatus for preventing harmful effects of a fumigant on an article in a fumigant space filled with fumigant gas generated from the fumigant, wherein the apparatus covers the article in the fumigation space and defines an isolated space around the article. A gas-impermeable coating material, an airbag disposed in a fumigation space and capable of being filled with a non-corrosive gas, a blower pump having a suction port communicated with the airbag,
A gas branch pipe communicating with the discharge port of the blower pump, a regulator, and a distribution passage communicating the gas branch pipe with the isolation space, wherein the regulator is disposed in the distribution passage and supplied from the airbag to the isolation space by the blower pump. Equipment that regulates the flow rate of the non-corrosive gas that is used 10. The air-bag according to claim 1, wherein the air-bag is formed of a flexible material and has a volume reduced according to an amount of a non-corrosive gas supplied to the isolation space from the air-bag. 10. The facility of claim 9, wherein the covering is a flexible sheet. 11. The fume pump is disposed outside the fumigation space, and a hose that connects the airbag and the blow pump and a hose that connects the blow pump and the isolation space each have a partition between the fumigation space and the outside world. Equipment that is placed through the wall. 12. The fumigation gas is a hydrocyanic acid gas or a hydrogen phosphide gas, the non-corrosive gas is air, and the non-corrosive gas supplied to the isolation space is fumigated from the isolation space via a release tube. The equipment according to any one of claims 9 to 11, wherein the equipment is discharged into the space little by little.