JPH10246571A - Method for drying ray unhulled rice to control generation of ethylene - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of ethylene through cooling, dehumidification, and drying without raising the temperature of the received unhulled rice, and to keep the taste by removing the generated ethylene. SOLUTION: In the drying method, the temperature of the unhulled rice is dropped to about 14 deg.C through the rapid cooling and dehumidifying operation by fully operating a refrigerating machine, a dehumidifier, and a differential pressure fan until the water content of the received unhulled rice reaches about 16%, and then, the operation of the refrigerating machine is stopped, the temperature of the unhulled rice is raised to about 20 deg.C through the dehumidifying operation by the dehumidifier and the differential pressure fan, and the water content is dropped to about 15% and the unhulled rice is stored. An ethylene cut machine is operated to remove ethylene to be generated from the unhulled rice during the dehumidification and storage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying method for drying and storing and discharging paddy harvested by a combine or the like to a predetermined state so as not to lose the taste.

[0002]

2. Description of the Related Art Conventionally, any of the following methods has been adopted as a method for drying paddy harvested by a combine or the like. The first is a method of drying with air heated by thermal power. The second is a method of drying with air heated by a device heated by a heat pump. The third method is a method in which the cooled air is reheated with a refrigerant and dried with the cooled and dehumidified air.

[0003] However, in the first method described above, the air temperature tends to increase, the grain temperature also increases, the taste deteriorates, and there is a risk of fire. The second method can keep the grain temperature low, but when the moisture content of the paddy is about 24%, the air temperature is still high and the taste is low. The third method is good when the water content of the paddy is about 24%, but when the water content of the paddy becomes about 20%, the drying speed decreases. And other defects.

Accordingly, the present applicant has filed Japanese Patent Application No. 8-236412.
Application for "Rice drying method and drying device" in the issue, and as a method to dry the raw rice after harvesting using a drying device, change the operation mode to the cooling and dehumidifying mode until the water content of the rice becomes about 20%. , 36 ° C, relative humidity of about 28% is blown to the paddy, and then, while the water content of the rice is between 20 and 15%, dry air of about 41 ° C and a relative humidity of about 25% is heated by a heat pump. When it is necessary to dry and further store at a low temperature after drying, a cooling air of 15 ° C. and a relative humidity of about 75% is blown in the cooling mode.

[0005]

However, although the above-mentioned improved method solves the conventional problems, raw rice harvested by a combine or the like is damaged by bruising. Because of this, ethylene generated from raw rice during the drying process
When heating to 1 ° C, the problem remains in maintaining the taste, and if further low-temperature storage is required, a drying step with poor thermal efficiency such as lowering the temperature of the paddy to 41 ° C and then lowering to 15 ° C is required, The cost was also increased.

[0006] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to maintain the taste and prevent unnecessary cost increase by performing cooling and dehumidification without increasing the temperature of the received paddy. I do.

[0007] In order to solve the above-mentioned problems, as a method of receiving raw rice after harvesting at a rice center and drying it using a drying device, a freezer or a dehumidifier is used until the water content of the rice becomes approximately 16%. And the rapid cooling and dehumidifying operation by the full operation of the differential pressure fan to reduce the temperature of the paddy to about 14 ° C., and then stop the operation of the refrigerator and reduce the temperature of the rice to 20 ° C. by the dehumidifying operation by the dehumidifier and the differential pressure fan. The temperature is raised to about 15%, and the water content is reduced to about 15%, and stored in this state.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The drying method of the present invention is drying by a combination of cooling dehumidification and chemical dehumidification using silica gel. The average value of the water content of the paddy at the time of receipt is about 24%,
This paddy is dehumidified in the first mode of the rapid cooling and dehumidifying operation until the water content becomes about 16%, and then is performed in the second mode of the dehumidifying operation until it becomes about 15%. In addition, as an example, the following data is described assuming that an equipment scale with a processing amount of 18 t (18000 kg) per unit is one unit.

The first mode (24% for 10 hours of operation)
16%), the refrigerator, the dehumidifier, and the differential pressure fan are fully operated to perform rapid cooling dehumidification for 10 hours with air at a temperature of 14 ° C. and a humidity of 65%.
° C) to about 14 ° C to reduce the water content to 1
Reduce to 6%. The amount of dehumidification per unit in this mode is (24-16)% × 18000 kg / 10 h = 144 kg / h The drying rate is 0.8% / h

In the second mode (3 hours of operation), the refrigerator is stopped, and only the dehumidifier and the differential pressure fan are operated to continue the dehumidification while raising the paddy temperature to 20 ° C. together with the temperature in the refrigerator. Reduce final humidity to 15%.

[0011] In this state, that is, by storing and shipping at a paddy temperature of 20 ° C and a water content of 15%, the rise of moisture and the generation of mold due to the dew condensation of the paddy immediately after shipping that occur when the paddy is shipped. And so on.

FIG. 1 is a diagram showing the relationship between temperature and humidity of paddy in a differential pressure cooling / dehumidifying / drying chamber, FIG. 2 is a flow process diagram of paddy, and FIG. 3 is a differential pressure cooling / dehumidifying / drying method for carrying out the method for drying paddy of the present invention. It is an internal block diagram of a storage.

In FIG. 2, paddy harvested by a combine or the like is first put into a hopper 11, dust is removed by a roughing machine 12, the weight of the paddy is measured by a measuring device 13, and the moisture of the paddy is measured by a voluntary inspection device 14. measure. After the measurement, the paddy is put into the container 4 in a fixed amount. In the apparatus according to the present embodiment, for example, the daily throughput is about 18 tons, which is stored in 18 pallets for about 1 ton, and is stored in a differential pressure type cooling, dehumidifying and drying cabinet.

The container 4 has a structure in which two opposite sides can be ventilated, and a pallet is inserted and removed from this side. The other two sides, the upper surface, and the bottom surface are closed surfaces, and the inside is It is configured to ventilate in only one direction.

The container 4 is installed so that the side of the opening is in close contact with the suction chamber 5a at the center of the processing chamber 5 in the differential pressure type cooling, dehumidifying and drying cabinet 10 shown in FIG. The operation is performed according to the temperature and humidity relationship diagram in the differential pressure type dehumidifying / drying chamber of FIG.

The paddy initially contained in the container 4 generally contains about 24% of water at 30 ° C. In this state, operation is started in the first mode. In this case, the refrigerator 2,
By operating the dehumidifier 1 and the differential pressure fan 3 in the full operation state, the inside of the processing chamber 5 is brought into the first mode rapid cooling dehumidification operation state at 14 ° C. and 65% air, and the inside of the container 4 in about 10 hours. The temperature of the paddy is rapidly increased by strong ventilation toward the central suction chamber 5a.
Down to In order to remove ethylene generated from paddy during the first mode operation, the operation is provided with an ethylene cut device 6.

Next, operation is performed in the second mode. That is, the refrigerator 2 is stopped, the dehumidifier 1 and the differential pressure fan 3 are in a full operation state, the temperature of the paddy is raised to about 20 ° C., and the water content is reduced to 15%. Even during the operation in the second mode, the ethylene cut device 6 is operated to remove generated ethylene.

Thereafter, the refrigerator 2, the dehumidifier 1 and the differential pressure fan 3 are stopped to store the paddy. Please note that when shipping
As shown in (1), the container 4 stored at 20 ° C. and 15% is taken out, passed through a hulling machine 15, a rice sorting machine 16, and a bag packing machine 17, and shipped as bagged brown rice or in a flexible container.

[0019]

As described above, raw rice after harvesting is damaged by bruising when threshing by combine. Therefore, when heated, the ethylene in the paddy increases, the respiration of the paddy abnormally increases, and the respiratory heat raises the grain temperature. For this reason, the taste is reduced. However, in the above-described method, the generation of ethylene is suppressed because the rice is cooled, and the generated ethylene is removed by the ethylene cut device 6, so that the respiratory heat is suppressed and the taste is reduced. Absent.

Since the temperature of the paddy at the time of shipment is 20 ° C., there is no dew condensation even when exposed to the outside air, so that an increase in the water content of the paddy due to the dew condensation and the occurrence of mold can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing the relationship between the temperature and humidity of paddy in a differential pressure type cooling, dehumidifying and drying cabinet.

FIG. 2 is a flow process diagram of paddy.

FIG. 3 is an internal configuration diagram of a differential pressure type cooling / dehumidifying / drying cabinet for carrying out the rice drying method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehumidifier 2 Refrigerator 3 Differential pressure fan 4 Container 5 Processing room 5a Suction chamber 6 Ethylene cut device 10 Differential pressure type cooling dehumidifying drying cabinet

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tadashi Sakakibara 2-29-17 Minamimagome, Ota-ku, Tokyo Inside Ryosan Kogyo Co., Ltd.

Claims (1)

[Claims] Claims 1. As a method of receiving raw rice after harvesting at a rice center and drying it using a drying device, the production of ethylene from raw rice is suppressed, and ethylene in the atmosphere is further removed, so that rice quality is reduced. In the method of drying while preventing deterioration, a refrigerator,
Perform quick cooling dehumidification operation by full operation of dehumidifier and differential pressure fan to lower rice temperature to about 14 ° C, then stop operation of refrigerator and dehumidify operation by dehumidifier and differential pressure fan to reduce rice temperature. A method for drying raw rice for controlling ethylene production, characterized in that the temperature is raised to about 20 ° C. and the water content is lowered to about 15% and stored in this state.