JPS63126427A - Apparatus for storing perishables - 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 Field of the Invention The present invention relates to a fresh produce storage device that allows fresh produce such as vegetables and fruits to be stored for a long period of time at the production site or at the distribution stage.

BACKGROUND TECHNOLOGY Refrigerated storage is a common means of storing perishables, but in addition to this, CA storage, which changes the air composition within the storage room, is also available as a means of long-term storage. In other words, the concentration of oxygen (02) in the storage chamber is reduced, and the concentration of carbon dioxide (C
o2) It is known that by increasing the concentration, it is possible to suppress the respiration of fresh foods and also to prevent chemical reactions such as decomposition and oxidation by microorganisms. As for this CA storage method, for example,
As shown in Publication No. 04, there is a gas generating device that reduces the oxygen concentration in the storage by burning fuel containing carbon in a combustion device and introducing combustion exhaust gas into the storage, and a gas generating device that reduces the oxygen concentration in the storage. It is composed of a CO2 absorption tower (gas adjustment device) that adjusts the value.

On the other hand, in such perishables storage equipment (CA storage equipment), perishables can be stored for a long time by circulating cold air inside the storage using a cooling device and by cooling and adjusting the atmosphere. Needless to say, the atmosphere must be adjusted to a predetermined level immediately after the product is stored, and it is desirable that the perishable product is always kept under stable cooling conditions.

Problems to be Solved by the Invention In the fresh food storage apparatus as described above, when adjusting the atmosphere inside the warehouse, for example, when the CO2 concentration reaches a predetermined value at 6%, when reducing the O2 concentration to 6%, , the air inside the warehouse is sent to the combustion furnace, where the combustion furnace converts the 0 in the air into Co2, and this air is introduced into one of the two carbon dioxide adsorbers of the gas adjustment device, and the inside is filled with activated carbon, etc. The adsorbent absorbs ■2 in the air, returns this air to the inside of the refrigerator, and on the other hand,
A blower blows air into the room and the C adsorbed on the adsorbent.
Regeneration of the adsorbent to remove O2 was carried out at different times, for example, 6 minutes for adsorption and 6 minutes for desorption.

However, due to performance deterioration due to adsorption/desorption time and long-term use of the adsorbent, there was a problem in that the CO2 concentration in the storage chamber could not be adjusted well, making it impossible to function satisfactorily as a gas regulating device.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a fresh produce storage device that can quickly adjust the inside of a storage to a predetermined atmosphere.

Means for Solving the Problems A storage for storing perishables, a cooling device for cooling the inside of the storage, a combustion furnace for burning a carbon-containing fuel to introduce carbon dioxide gas into the storage, and a combustion furnace for the combustion. A carbon dioxide gas generator comprising a blower that circulates air to be used for combustion of the fuel in the furnace through the storage, an adsorber that adjusts the atmosphere in the storage to a predetermined value, and an air blower that regenerates the adsorber. The combustion chamber is equipped with a gas regulating device consisting of a gas regulating device, and a bypass circuit that directly introduces the combustion gas from the combustion furnace into the storage.

Function The present invention has the above-described configuration to absorb Co adsorbed onto the adsorber.
Since the amount of 2 can be adjusted, the inside of the storage can be quickly adjusted to a predetermined atmosphere.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

In the figure, 1 is a storage such as a prefabricated refrigerator for storing perishables, and a compressor 2. Condenser 3° Evaporator 4. A cooling device 7 made up of blowers 6, 6 is mounted on the top. The blower 6 cools the condenser 3, and the blower 6 forcibly circulates cold air from the evaporator 4 into the warehouse. The storage 1 is connected to a carbon dioxide gas generator 8 for introducing carbon dioxide (Co2) into the storage, and a gas adjustment device 9 for keeping the atmosphere inside the storage constant. Carbon dioxide gas generator 8
are an introduction pipe 1o that introduces air in the storage 1, and a valve 1.
By switching the valve 14.12, the valve 14. Air blower 16
(for example, a sirocco fan) and a combustion furnace 16. The blower device 16 sends the air in the storage 1 to the combustion furnace 16 through the introduction pipe 1o, and by switching the valves 11 and 12, the combustion gas in the combustion furnace 16 and the gas in the storage are sent to the gas adjustment device 9. This is to be introduced. The combustion furnace 1e includes a casing 18 equipped with a ceramic tube 17 on the inner surface, a loss handle/cover 20 on which a solid fuel 19 is placed inside the casing 18, and a blower 15 that heats the air to generate the solid fuel 19.
It is composed of an ignition heater 21 for combusting. The solid fuel 19 is a high-purity carbon material such as charcoal, and upon combustion, generates Co2 as a combustion gas. The combustion gas becomes N2 and Co2 due to the reaction of C+02→CQ2.

22 is a valve for introducing outside air to continue combustion of the solid fuel when the O2 concentration from the inlet pipe 10 is extremely low, and 23 is a heat exchanger for cooling the exhaust pipe 13.

On the other hand, the gas adjustment device 9 includes two adsorbers 24 and 26,
Inlet pipe 26 for sending combustion gas to gas regulator 9, storage 1
Exhaust pipe 27. Air blower 28° Air blower 29 for regeneration of adsorption device 24. It is composed of valves 30 to 34.

The adsorber 24.25 is filled with activated carbon 35.36, and 37 is a CO2 sensor that senses the Co2 concentration in the storage 1.
2 concentration sensor, 38 is bypass circuit, 39 is valve 3
This is a control device that opens and closes 0 to 34.

The operation of the fresh food storage apparatus constructed as described above will be explained with reference to FIGS. 1 and 2.

Cooled to an arbitrary temperature by the cooling device 7 (for example, AT=2
℃) When fruits and vegetables are placed in storage 1, the atmosphere inside storage 1 is an outside air atmosphere (N2 near 9%).

02=21%), which is point A in Figure 2. This (1m
, in a cA atmosphere (for example, N2 = 9o%, Co2 = es%
.

02=s%) The carbon dioxide gas generator 8 is activated to reach point C in FIG. Then, the air inside the refrigerator is supplied to the inlet pipe 10, the valve 14. The air is introduced into the combustion furnace 16 via the blower 16 and subjected to combustion. The combustion gas from the combustion of the solid fuel 19, that is, N2 and Co2 gas, closes the valve 11.30,
With the valves 12 and 34 open, it is introduced into the warehouse through the adsorber 26, and 02 gradually decreases and CO2 increases.

At this time, the exhaust pipe 13 is cooled by the heat exchanger 23 in order to prevent the combustion gas generated by the combustion of the solid fuel 19 from reaching a high temperature. Also, since the combustion gas passes through the adsorber 26, the CO2, NO, and SO contained in the bisque gas are adsorbed by the activated carbon 36, but since the concentration of CO2 is high, the adsorption limit is reached after a while, and CO2 is removed from the adsorber 25. It's leaking.

Inner atmosphere 75: (N = 79%, 02 = 1s%, C0
2=6%) When reaching point B in Figure 2, the CA atmosphere (N2=
90%, 02=ts%, Co2=s%), the gas regulator 9 operates to remove Co2 whose C2 has changed due to combustion, and the valve 30 opens and the valve 34 closes. After the combustion gas passes through the adsorption device 25, it is introduced into the adsorption device 24, which adsorbs CO2 in the combustion gas that contains too much CO2, and returns it to the inside of the refrigerator through the exhaust pipe 27.

However, the adsorption capacity of the adsorber 24 filled with activated carbon 36 deteriorates if it adsorbs a certain amount of Co2, so it is configured to adsorb CO2 for a while and then desorb the Co2.

For example, when the adsorber 24 is performing an adsorption action, the valves 30, 33 are open and the valves 31, 32, 34 are closed, and when the adsorber 24 is performing an adsorption action, the valves 31, 32, 34 are open, The valves 30 and 33 are in the closed state, and the regeneration blower 29 blows air to the activated carbon 36, which has poor adsorption ability.
The CO2 concentration inside the warehouse is controlled to 6%.

Here, the inside of the refrigerator is set to CA atmosphere (N 2 =90%, 022
5%, CO□ = 6ch) If the operation of the adsorber 24 is continued to reach point C in Figure 2, the CO2 that has circulated from the storage 1 to the combustion furnace 16 will be adsorbed by the adsorption device 24, so that the CO2 inside the storage 1 will be adsorbed. During this control, the Co2 concentration sensor 37 senses the 002 concentration in the storage chamber 1, and if the concentration is less than 6%, the valve control device 39 Xibarpu 31, 32.
34 is opened to introduce CO2-rich combustion gas into the chamber, and valve 30.33'ii is closed and the regeneration blower 29 is opened.
If the concentration in the storage chamber 1 is 6% or higher, valves 30, 33 are opened to adsorb Co2 in the combustion gas, and valves 31, 32 and 34 are closed for regeneration. The blower 29 is stopped.

With this, it is possible to accurately maintain the entire CO2 concentration in the storage chamber, starting from 6th.

Effects of the Invention Therefore, the present invention, when the Co2 concentration is below a predetermined concentration, sends the Co2-rich combustion gas into the storage through the bypass circuit, and in the meantime regenerates the adsorber, thereby reducing the CO2
When the concentration is higher than the specified concentration, Co is passed through the regenerated adsorber.
2. It can adsorb Co2 'i in rich combustion gas, so the inside of the storage can be quickly adjusted to the specified atmosphere.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a fresh produce storage device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the air atmosphere and operation of the device. 1...Storage, 7...Cooling device, 8.
... Carbon dioxide gas generator, 9 ... Gas adjustment device, 16 ... Air blower, 16 ... Combustion furnace, 24 ... Adsorption device , 29...Blower device.

Claims (1)

[Claims] A storage for storing perishables, a cooling device for cooling the inside of the storage, a combustion furnace for burning fuel containing carbon to introduce carbon dioxide into the storage, and a combustion furnace for burning the fuel. a carbon dioxide gas generation device comprising a blower device that circulates air from the storage; an adsorption device that adjusts the atmosphere in the storage to a predetermined value; and a gas adjustment device comprising a blower device that regenerates the adsorption device; and a bypass circuit for introducing combustion gas from the combustion furnace directly into the storage.