JPH03111286A - container fumigation equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a container fumigation system, and in particular, to exhaust fumigation gas dispersed in a container in a short time, and to prevent exhaust piping from hindering cargo handling operations. 6. Concerning fumigation equipment suitable for preventing the occurrence of damage [Prior art] Conventionally, the structure of containers has been determined mainly based on the storage rate of cargo, and consideration has not been given from the perspective of performing fumigation while the cargo is stored. It had not been done. For this reason, containers usually have a structure in which only one side is used as a loading door and the other side is a sealed surface.

By the way, imported fruits and vegetables packed in containers are fumigated to exterminate any pests attached to them. Conventional extermination methods have included transferring fruits and vegetables from containers to a fumigation warehouse and fumigating them, or placing the entire container of woody plants in a warehouse and fumigating them. In addition, fumigation of grains loaded in bulk in containers is carried out using special containers equipped with fumigation gas piping. In particular, grain fumigation equipment
As shown in FIG. 6, a dispersion pipe 15 is installed at the bottom of a container 1 containing grains 14, and an iJI! An i-ring pipe 16 is provided, and the dispersion pipe 15 and circulation pipe 16 are connected via a valve 17 and a stirring fan 3. Further, a dispensing device 10 and a valve 13 are connected to the discharge side of the stirring fan 3 via a valve 9.
An outside air introduction fan 18 is installed through the. Furthermore, an exhaust fan 7 is connected to the circulation pipe 16 via a valve 6 branching off from the circulation pipe 16 . In this fumigation device, valves 6 and 1
3 is closed, fumigation gas is supplied from the dosing device 10 through the valve 9, and the fumigation gas is uniformly dispersed within the container 1 by the stirring fan 3 to perform fumigation. After fumigation, close valve 9 and open valve 6.13 to stir container 1 with stirring fan 3.
Supplying outside air with the outside air introduction fan 18 while stirring the inside,
The fumigation gas is discharged to the outside together with the air through the exhaust fan.

[Problem to be solved by the invention]

The above-mentioned conventional fumigation method has drawbacks such as firstly, loading and unloading work is required in the case of transfer, and the method of putting the container body into a warehouse has very poor storage efficiency. Furthermore, in the method using a container equipped with fumigation gas piping, HCN in the fumigation gas is particularly likely to be adsorbed, so unless a structure that can sufficiently disperse the supplied outside air as in the above structure is used, the HCN inside the container will reach the working environment standard. There is a problem in that it takes a lot of time to lower the iPi degree.

As described above, the conventional method has disadvantages in that the dispersion pipe is installed inside the container, which reduces the storage capacity and requires a great deal of labor to connect the container to the fumigation equipment. As a means to overcome these drawbacks, it has been proposed to exhaust air from the bottom of the container and install a duct in the longitudinal direction of the container through the ventilation opening at the top of the container, but this would interfere with the loading and unloading of fruits and vegetables into the container. There has been a problem in that it obstructs the flow of cold air that cools the fruits and vegetables, thereby hindering the cooling of the fruits and vegetables.

An object of the present invention is to provide a container fumigation device that can exhaust fumigation gas inside a container in a short time.

Another object of the present invention is to provide a container fumigation system that does not require installation of a duct inside the container that would impede cargo handling or cooling.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a container fumigation device having a fumigation gas supply means, a circulation ventilation means, and a fumigation gas exhaust means, which is connected to an outside air intake port of a container to which the fumigation device is connected. It is characterized by the installation of an intake duct that extends in the longitudinal direction.

The intake duct is composed of a telescopic cylindrical duct that expands and contracts when air is blown.

Further, the intake duct is configured to be housed inside the outside air intake port of the container. Furthermore, the intake duct) is set to have a length of approximately 0.4L, which is the total length of the container.

[Effect]

Outside air is sucked in through an intake duct extending in the longitudinal direction of the container between the container ceiling and the object to be fumigated, and the fumigation gas is discharged by replacing it with this air. At this time, since the air outlet of the air intake duct is located at about 0.4L of the total length of the container, the outside air blown out from the air intake duct is evenly distributed, adsorbed to the objects to be fumigated and cardboard, and exhausted. HCN, which is difficult to remove, is also exhausted in a short time.

In addition, by making the intake duct a cylindrical structure that expands when air is blown, the intake duct can be contracted during cargo handling operations and cooling during transport, so it does not become an obstacle to cargo handling operations and cooling of fruits and vegetables.

〔Example〕

An embodiment of the container fumigation apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a system diagram of a fumigation system according to an embodiment of the present invention. This device consists of a stirring system that connects an air inlet 2 attached to a container 1 through a stirring fan 3 to an air supply port 4 of the container 1, and an exhaust gas treatment system that connects an air inlet 4 at the bottom of the container 1 through a valve 6 and an exhaust fan 7. an exhaust system connected to the device 8;
It consists of a dosing device 10 connected to the stirring system via a valve 9, an air intake duct 12 installed in the longitudinal direction of the container from an outside air intake port 11 at the top of the container, and the like.

Note that 13 is an intake valve, and 20 is an object to be fumigated.

As shown in FIG. 1, the intake duct 12 is arranged along the ceiling of the container 1, and its opening is located near the center of the container.

The length l of the air intake duct 12 is set so that the outside air is introduced into the container at a position of about 0.4L of the total length of the container so that the outside air is uniformly diffused inside the container. That is, regarding the influence of the length of the intake duct on HCN exhaust, it was confirmed that when applied to a conventional container, as shown in FIG. 3, the HCN concentration per hour decreases significantly from about 5 m.

In addition, if the intake duct 12 is made of a hard material f[, it will be exposed inside the container as shown in Figure 1, but if a flexible and expandable intake duct structure is adopted In addition to waiting for fumigation, they can also be stored in a location that does not interfere with cargo handling operations. For example, the second
The expandable air intake duct 121 shown in the figure has a cylindrical shape made of cloth or vinyl, and has one end fixed inside the outside air intake 11 of the container, and the other end attached to the periphery of the opening that blows out outside air. A resistor 21 is provided to extend the intake duct using the suction force of outside air.

According to such a configuration, when in use, it is expanded into the container 1 as shown by the dotted line using the suction force of outside air, while when not in use, it is contracted and stored inside the outside air intake port 11 as shown by the solid line in the diagram. be able to.

According to this embodiment, since it is retracted and stored in the outside air intake port 11 except when performing fumigation, it does not get in the way during cargo handling operations. Furthermore, as shown in the fourth figure, in a container equipped with cooling equipment, the air that passes through the grating 15 and is cooled by the heat exchanger 17 of the cooler 16 during cooling is blown out from the outlet 19 to the upper part of the container by the cooling fan 18. After that, the fruits and vegetables in the cardboard boxes are cooled by passing between the cardboard boxes that are the objects to be fumigated 20. In this type of container, if the intake duct is not installed, the flow of cold air from one outlet will be obstructed,
Although fruits and vegetables near the intake duct are not cooled, this disadvantage can be overcome by using a retractable intake duct since it does not extend into the container. Note that 14 is an outside air intake fan.

Next, the operation of the above embodiment will be explained. The air inside the container is taken in through the air intake port 2 by the stirring fan 3, and this air is sent to the container again through the air supply port 4 and stirred. In this state, the valve 9 is opened and fumigation gas is supplied from the dosing device 10 to the stirring system and dispersed within the container 1. After performing fumigation for a predetermined period of time, the valve 11 is opened and outside air is sucked into the container 1 through the intake duct 12, and the fumigation gas that has been adsorbed is desorbed by contacting the fruits and vegetables 13 placed in the Daji cardboard box. let That is, the outside air is sucked through the air intake duct) which is opened at a position of about 0.4 L along the entire length of the container at the top of the container. Therefore, the outside air coming out of the intake duct is diffused over the entire upper part of the container and flows downward. At this time, the fumigation gas adsorbed on fruits and vegetables is desorbed. The air containing this fumigation gas is sent from the exhaust port 5 through the valve 6 to the exhaust gas treatment device 8 by the exhaust fan, where it is detoxified and released into the atmosphere.

FIG. 5 shows the relationship between the HCN'LR degree of the exhaust gas and the exhaust air volume for one hour after fumigation at an HCN concentration of 1000 ppm. According to this experimental data, when an intake duct (N = 5 m) is installed, the HCN concentration after 1 hour is much lower than that without an intake duct (/-0), and the exhaust air volume is 20 m'/ Under the minimum condition, the HCN concentration inside the container was reduced to 10pp, the working environment standard, after 1 hour of evacuation.
It can be made less than m.

Note that Q is the exhaust air volume, and ■ is the container capacity.

In this embodiment, the stirring system and the intake/exhaust system have separate 1-inch ports for the container, but the outside air intake port 11 and the air supply port 4 for the stirring system are shared, and the exhaust port 5 and the stirring system intake port 2
may be shared. This allows the fumigation device to be attached to the container at two locations, simplifying the operation. Further, in this embodiment, the container door is provided with a connection part to the fumigation device, but instead of using the container door, an airtight door to which the fumigation device is connected in advance may be attached to the container opening.

〔Effect of the invention〕

According to the present invention, since the opening of the intake duct is located near the center 11 in the longitudinal direction of the container, the outside air is uniformly diffused, and the fumigation gas inside the container can be exhausted in a short time, thereby preventing chemical damage to fruits and vegetables. can be prevented.

In addition, since the container is constructed with an extensible air intake duct that can be stored in the outside air intake of the container, the air intake duct can be stored during cargo handling operations, improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a container fumigation system showing one embodiment of the present invention, Fig. 2 is a partial sectional view of a container showing an embodiment of the pond in the intake duct, and Fig. 3 is a diagram of the intake duct for HCN exhaust. 4 is a system diagram of a container with cooling equipment, FIG. 5 is an exhaust characteristic diagram, and FIG. 6 is a system diagram of a conventional container fumigation system. DESCRIPTION OF SYMBOLS 1... Container, 3... Stirring fan, 7... Exhaust fan 8... Exhaust gas treatment device, 10... Dosing device 11...
・・Outside air intake 0.12 ・・Intake duct 121 ・・Extensible intake duct Fig. 12 Toy A 3゛ 1! 4 Den 7.1 Silky hair Hupun 1o: Throwing number 151i Yobiku 16・□4i

Claims (4)

[Claims] (1) In a container fumigation device having a fumigation gas supply means, a circulation ventilation means, and a fumigation gas exhaust means, the container is connected to an outside air intake port of a container to which the fumigation device is connected, and extends in the longitudinal direction of the container to draw in air. A container fumigation device characterized by having a duct installed. (2) The container fumigation apparatus according to claim 1, wherein the intake duct is constituted by a retractable cylindrical duct that is extended by blowing air. (3) The container fumigation apparatus according to claim 2, wherein the intake duct is configured to be housed inside the outside air intake port of the container. (4) The container fumigation apparatus according to claim 1 or 2, wherein the intake duct is set to have a length of approximately 0.4L, which is the total length L of the container.