JPS6117462B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a grain storage device, and more particularly to an improvement in a grain storage device that allows gas to be circulated within the grain storage and oxygen contained in the gas to be removed by an oxygen scavenger. When storing grains, reducing the oxygen in the atmosphere that affects their respiration to the necessary limit and creating a state of suspended animation will prevent grains from ripening (over-ripening), prevent mold and insects, and prevent oxidative deterioration of nutrients. It can be prevented. Therefore, in order to remove the oxygen in the grain storage, the present inventors have studied various methods of circulating the gas in the storage and removing the oxygen in the gas using an oxygen scavenger. Oxygen scavengers are usually placed in gas barrier bags and are opened before use, but they start absorbing oxygen as soon as the bag is opened, so they have the disadvantage that they must be loaded as quickly as possible. In particular, storage of grains requires a large amount of oxygen scavenger, so it is desirable to have a large capacity for handling. The present invention solves this problem. That is, in the present invention, a sealable grain storage, a moisture-containing substance chamber, a deoxidizing chamber, and a blower form a circulation path, and the deoxidizing chamber substantially absorbs no oxygen in the absence of moisture or absorbs no oxygen. This is a grain storage device that accommodates a slow-speed oxygen scavenger and is capable of removing oxygen within the grain storage by circulating gas within the system. In the present invention, any oxygen scavenger can be used as long as it does not substantially absorb oxygen in the absence of moisture or has a slow oxygen absorption rate. Examples of such oxygen scavengers include various reducing agents such as iron,
dithionite, thiosulfate, hydroquinone,
Examples include those mainly containing pyrogallol and the like and containing substantially no water. In the present invention, the water-containing substance is not particularly limited as long as it supplies moisture to the oxygen scavenger to exhibit oxygen absorption ability, but a substance having an equilibrium temperature of 75 or higher is preferable. For example, glass wool, zeolite,
Examples include sponges, valve scraps, crushed ironstone soaked in water, etc. Silos are usually used for grain storage. The oxygen scavenger chamber and the water-containing substance chamber are chambers that contain an oxygen scavenger and a water-containing substance, respectively. Preferably, the chambers are arranged such that the circulating gas passes through the hydrous chamber and into the deoxygenation chamber. In particular, the water-containing substance chamber is integrated with the deoxidizing chamber and is contained within the deoxidizing chamber, and the lower part of the deoxidizing chamber is a part for accommodating the hydrated substance, and the upper part is the part for accommodating the deoxidizing agent, which circulates from the lower part to the upper part. Those that allow gas to pass through are preferably used. The present invention requires a grain storage, a moisture-containing substance chamber, a deoxidizing chamber, and a blower.
Other mechanisms can be provided as necessary. Examples include dust removal room, clean room, inside air outlet, mixed gas supply valve, manometer monitoring board, etc. Next, an example of the apparatus of the present invention will be explained with reference to the drawings. In FIG. 1, 1 is a silo, 2 is a blower, 3 is a deoxidizing chamber, 4 is a water-containing substance storage area, 5 is an oxygen scavenger storage area, and 6 is a nitrogen gas cylinder. The gas in the system is circulated by the blower 2, and oxygen in the system is removed by passing the gas through the water-containing material section 4 and through the oxygen scavenger storage section 5. The present invention does not absorb oxygen when loading the oxygen scavenger,
Since the present invention is configured so that oxygen is absorbed only after tightly floating gas is circulated within the system, there is no loss of oxygen scavenger and it is easy to handle, so grains can be stored appropriately. I can do it. An example of storing grain using the apparatus of the present invention will be shown below. Example A test was conducted using the apparatus shown in FIG. Inner volume approx. 14
5 tons of brown soba as a test sample in a ^m2 steel silo
(approximately 10 m ³ ) and put the oxygen absorber into the oxygen absorber chamber. The air volume inside the storage system, including the inside of the silo, inside the deoxidation chamber, inside the blower, inside the piping, etc., was approximately 10 m ³ . In order to prevent deformation of equipment and inflow of outside air due to negative pressure due to volume reduction during deoxidation, a nitrogen gas cylinder was installed in the circulation piping, and nitrogen gas of 230 to 310 mmHg was constantly introduced using a pressure control valve.
A sampling port was installed in the circulation piping to measure oxygen concentration, temperature, humidity, etc. in the circulating air. After preparation is complete, the system is sealed and the blower is operated to start air circulation. This is the "start" point. Samples (brown soba) are taken from the silo over time and the moisture content (%) and peroxide value are measured. The quality of the samples was evaluated using measurement data such as index (meq/Kg) and chlorofilm (%) and sensory tests. The results are shown in Tables 1 and 2. Table 1 shows the oxygen concentration change measurement results, and Table 2 shows the brown soba storage test results. For comparison, a similar test was conducted without using a water-containing substance. The results are listed in Tables 1 and 2.

【table】

[Table] Compared to the starting point, the product according to the present invention had no decrease in water content, less change in POV, and less loss of chlorophyll. In addition, the superiority was clearly evident in the sensory test.

[Brief explanation of the drawing]

FIG. 1 shows an example of the apparatus of the present invention, in which 1 is a silo, 2 is a blower, 3 is a deoxidizing chamber, 4 is a water-containing substance storage area, 5 is an oxygen scavenger storage area, and 6 is a deoxidizer storage area. It is a nitrogen gas cylinder.

Claims (1)

[Scope of Claims] 1 A sealable grain storage, a moisture-containing substance chamber, a deoxidizing chamber, and a blower form a circulation path, and the deoxidizing chamber does not substantially absorb oxygen in the absence of moisture, or Or a grain storage device that contains an oxygen scavenger with a slow oxygen absorption rate and is capable of removing oxygen in the grain storage by circulating gas within the system. 2. Claim 1, wherein both chambers are arranged so that the circulating gas passes through the water-containing substance chamber and enters the deoxidizing chamber.
Storage device as described in Section. 3. The water-containing substance chamber is integrated with and included in the oxygen-absorbing chamber, and the lower part of the oxygen-absorbing chamber is the water-containing substance chamber housing part, and the upper part is the oxygen scavenger housing part, from the lower part to the upper part. 3. A storage device according to claim 2, wherein the storage device is adapted to allow circulating gas to pass therethrough. 4. The storage device according to claim 1, 2 or 3, wherein the water-containing substance chamber contains a water-containing substance having an equilibrium temperature of 75% or more.