JPH08247649A - Method of drying jellyfish - Google Patents

Abstract

PURPOSE: To shorten the drying time and enhance the work efficiency by adding small flakes of vegetable additive having a proper water permeability to jellyfishes to be dried and heating the mixture while agitating. CONSTITUTION: Jellyfishes collected on the bottom of a dry processing chamber 7 are arranged to move up slidingly one after another, keeping contact with the inner peripheral surface of an inner cylinder 2 loaded on the surface of a spiral blade 13. The jellyfishes which have arrived at the upper end of the spiral blade 13 are scraped downward to the bottom of the chamber with a scraper plate 15 and are moved up slidingly once again by means of the spiral blade 13. Small flakes of vegetable additive having a proper water permeability are added to the jellyfishes, thereby agitating them properly with the spiral blade 13 and heating them thoroughly while keeping them in contact with the inner peripheral surface of the inner cylinder during the upward movement. This construction makes it possible to shorten the processing time and thereby enhance the work efficiency.

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 heating jellyfish for drying.

[0002]

2. Description of the Related Art For example, when seawater is used as cooling water in a power station located at a seaside, jellyfish floating in the sea are attracted together with seawater to an intake port, and a cage-like suspended matter collector provided at the intake port is used. Since there is a risk of catching and depositing on seawater and impeding the uptake of seawater from the water intake, the jellyfish collected in this suspended matter collector is regularly removed.

By the way, the jellyfish thus collected and removed, if left on the ground as it is, gradually deteriorates to cause foul odor pollution, and requires a vast disposal space. For this reason, the jellyfish that have been collected and removed need to be subjected to an anti-corrosion treatment at an early stage and a volume reduction treatment (that is, a treatment to reduce the volume). Processing is known. Here, this "drying treatment" means about 9% of the body components.
Focusing on the biological characteristics of jellyfish, which is said to be water that causes 5% of decay, this is a treatment in which jellyfish are forcibly dehydrated and dried in order to prevent the decay and reduce the volume.

As a conventional example of such "drying treatment", a treatment method disclosed in, for example, Japanese Patent Laid-Open No. 60-155811 is known.

[0005]

However, in the treatment method disclosed in the above-mentioned publication, when the jellyfish is dehydrated, it is placed under severe temperature conditions (-2 ° C to 110 ° C) to cause the jellyfish to self-contract. Although the treatment is carried out to accelerate the dehydration, such a treatment method requires a long treatment time (about 1.5 hours), which inevitably results in a low work efficiency.

Therefore, the present invention was made as a proposal of a method for drying treatment of jellyfish, which shortens the treatment time to improve the work efficiency and stabilizes the properties of the jellyfish after the treatment to ensure the treatment effect. It is a thing.

[0007]

TECHNICAL BACKGROUND OF THE INVENTION Here, the technical background of the method for drying jellyfish according to the present invention will be described. The inventors of the present application adopted a heat drying method as a method for drying jellyfish and A drying test of jellyfish was conducted by a drying method, and it was confirmed from the test results that heat drying treatment was effective as a method for drying jellyfish. The results of this heat drying treatment test are shown in Table 1.

[0008]

[Table 1]

The test conditions for the heat-drying treatment test of this jellyfish are as follows.

(A) Heating method As a heating method, the chamber wall of the drying treatment chamber is heated from outside by steam, and the jellyfish put into the drying treatment chamber is brought into contact with the heated chamber wall. A so-called indirect heating method of heating the jellyfish by heat conduction from the chamber wall was adopted. Further, in this case, it is necessary to continuously and evenly contact the jellyfish with the chamber wall.

From this point of view, a drying device 1 as shown in FIG. 1 was adopted as the drying device used in the present heat drying test. Here, the structure of the drying device 1 will be briefly described. The drying device 1 is a double-tubular vertical type drying device including an inner cylinder 2 and an outer cylinder 3, and the inner cylinder 2 has an inner side. The space is used as the drying processing chamber 7. On the bottom wall 4 located at the bottom of the drying chamber 7, a crushing cutter 14 rotated at a high speed by a motor (not shown) via a sprocket 22 and a low speed rotation at a motor (not shown) via a sprocket 23. A pair of spiral blades 13 and 13 are provided. This spiral blade 1
Reference numerals 3 and 13 are arranged close to the inner peripheral surface of the inner cylinder 2, and the inner peripheral surface of the inner cylinder 2 is covered with jellyfish accumulated on the bottom of the drying chamber 7 in order. Slide upward while making contact with the surface. This spiral blade 13
The jellyfish that has reached the upper end of is scraped off to the bottom side by the scraping plate 15, and is again slid upward by the spiral blades 13 and 13. Jellyfish has a spiral feather 1
3 is heated uniformly by contacting the inner peripheral surface of the inner cylinder 2 while being raised while being appropriately stirred by 3.

The annular space between the inner cylinder 2 and the outer cylinder 3 serves as a steam jacket 6, into which steam for heating is introduced from a steam supply source 19, and the steam is used to heat the drying treatment chamber 7. The inner cylinder 2 serving as a wall is heated.

In FIG. 1, reference numeral 8 is an inlet provided in the ceiling wall 5, 9 is a lid for opening and closing the inlet 8,
The jellyfish are thrown into the drying processing chamber 7 through the feeding port 8. Further, reference numeral 10 is a residue discharge port 10 provided with a discharge gate 11, and from the residue discharge port 10, the jellyfish whose drying process has been completed is taken out as a residue. Reference numeral 12 is a drain port for discharging the condensed water in the steam jacket 6, 16
Is an exhaust port, 17 is an exhaust blower, and 18 is a deodorizer.

(B) Samples As shown in Table 1, two samples, Sample 1 and Sample 2, were prepared. Sample 1 is a jellyfish previously cut into about 50 mm square, and its weight is 35 Kg. Sample 2 is a living jellyfish itself which is not cut, and its weight is also 35 kg.

(C) Processing Conditions As shown in Table 1, the processing conditions are slightly different between Sample 1 and Sample 2. In the case of Sample 1, the steam temperature is 150 ° C, the steam pressure is 4.5 Kg / cm ² , and the steam amount is 1
It is set to 60 kg / H. For sample 2, vapor temperature 1
50 ℃, Steam pressure 5.0Kg / cm ² , Steam amount 200K
g / H.

(D) Processing status The processing status of each sample was examined at 5 minute intervals for a total processing time of 20 minutes, and the results are shown in Table 1. Here, the processing status of each sample will be considered.

In the case of sample 1 In the case of sample 1, the jellyfish becomes foamy at the bottom of the apparatus by heating for the first 5 minutes, and the water content is still high.
After the lapse of 10 minutes, the water content of the jellyfish has almost disappeared, and the jellyfish has shrunk to about 20 mm square and is white and dry. When 15 minutes have passed, the jellyfish has become burred on the wall surface of the device and is a little scorched. At the time of 20 minutes, the jellyfish hangs on the wall of the device,
It is completely dry. The weight of the jellyfish at the time of 20 minutes was 1 kg, and the weight before the treatment was 3 kg.
The weight loss rate was 97% with respect to 5 kg. The weight reduction rate is
Weight loss rate (%) = (jellyfish weight at the start of the test−jellyfish weight after the test) / (jellyfish weight at the start of the test).

Sample 2 In the case of Sample 2, the jellyfish becomes foamy at the bottom of the apparatus by the first heating for 5 minutes, and the water content is still high.
After 10 minutes, the water content is still high and the jellyfish has shrunk to a ball shape of about 100 mm. After 15 minutes, the water content of the jellyfish has almost disappeared, the jellyfish has shrunk to about 20 mm square and is white and dry. 20
At the time when minutes passed, the jellyfish had a slight scorch on the wall surface of the device. The weight of the jellyfish after the lapse of 20 minutes was 1.5 kg, and the weight reduction ratio was 96% with respect to the weight before treatment of 35 kg.

Judging from these treatment conditions, especially the weight reduction rate, it is considered that the jellyfish whose body component contains about 95% water is completely dried. Therefore, it was confirmed that such heat drying treatment is suitable as the method for drying treatment of jellyfish.

However, even if this heat-drying treatment is suitable as a jellyfish drying treatment method, the treatment time is about 20 minutes (in the case of the sample 2, it becomes longer).
Therefore, in terms of work efficiency in processing work, it is still not sufficiently satisfied. Therefore, the inventors of the present application have studied a method of shortening the processing time in such heat drying processing. At the same time, even if the treatment is completed, if the properties of the jellyfish after the treatment are unstable, there is a risk of rot or the like again, so it is necessary to stabilize the properties of the jellyfish after the treatment. From the research from such a viewpoint, as described below, it has been found that by adding a water-absorbing additive when heat-drying a jellyfish, it is possible to simultaneously shorten the treatment time and stabilize the properties after the treatment. Is.

[0021]

Based on the above findings, the method for drying a jellyfish of the present invention is, when heating and drying a jellyfish, the jellyfish to be dried is in the form of a strip having an appropriate water absorption property. It is characterized in that the plant-based additives are added and heated while stirring and mixing them.

[0022]

According to the present invention, the following actions and effects can be obtained with such a configuration. That is, to the jellyfish that is the target of the drying treatment, flaky plant additives having appropriate water absorption are added, and when these are heated while stirring and mixing, first of all, the plant additives absorb water. Therefore, by having the jellyfish heated while being stirred and mixed with this vegetable additive, at the same time as the evaporating action of water due to the heating of the jellyfish itself, the water exuding from the jellyfish by the water absorbing action of the vegetable additive is It is directly absorbed by the vegetable additive side, and the synergistic action of the two promotes the dehydration of the jellyfish, that is, the drying. The water absorbed from the jellyfish into the vegetable additive may be re-absorbed by the jellyfish side because the vegetable additive has a faster drying speed than the jellyfish because of its nature. Instead, the vegetable additives are constantly maintained in a state capable of absorbing the water of the jellyfish. As a result, the water content of the jellyfish is
It is dehydrated continuously and efficiently with a transition cycle of jellyfish → plant additives → evaporation, and a high level of drying action is realized.

Secondly, since the above-mentioned vegetable additive has a strip-like form, when the vegetable additive is stirred and mixed with the jellyfish, a state in which the vegetable additive is attached to the entire surface of the jellyfish. Becomes Therefore, the jellyfish will be heated via the vegetable additives attached to its surface, which is “sticky”, for example when the jellyfish directly contacts the heated surface.
Is prevented as much as possible. Therefore, the heat transfer performance of the heating surface does not deteriorate due to "sticking" to the heating surface of the jellyfish, and the jellyfish can be heated and dried efficiently, and the drying processing time can be shortened accordingly. Is. Further, in this case, since the vegetable additive adhering to the surface of the jellyfish comes into contact with the heating surface, the plant additive has a heat transfer property in addition to its characteristic elements, and thus is more effective than the jellyfish. Then, the drying speed becomes faster, which contributes to the shortening of the drying processing time.

Third, after the jellyfish is dried,
Even if there are incompletely dried jellyfish,
The water that exudes from the jellyfish is absorbed and stored in the plant-based additive, and thus the jellyfish after the drying treatment has stable properties and maintains a solid state as a whole. Therefore, the deterioration of jellyfish is surely prevented.

Fourthly, various disposal methods are conceivable, for example, the jellyfish after the drying treatment is incinerated or used as a soil improving material as it is, or is used as compost by utilizing decomposition action by microorganisms. However, in any of these disposal methods, what is added to the jellyfish is a vegetable additive, which does not hinder incineration, decomposition by microorganisms, etc. I have. Therefore, final disposal after the drying process is safe and easy.

As described above, according to the jellyfish drying treatment method of the present invention, the work efficiency is improved by shortening the jellyfish drying treatment time, and the spoilage is prevented by stabilizing the properties of the jellyfish after the drying treatment. They are compatible with each other and have extremely high utility as a method for treating jellyfish.

[0027]

EXAMPLES The method for drying jellyfish according to the present invention will be specifically described below. The present inventors, when carrying out the jellyfish drying treatment method according to the present invention, select wood chips, dried moss, and bran as plant additives to be mixed with the jellyfish to be dried, and add these plant additions. The jellyfish were dried using each of the products, and the treatment status is shown in Table 2.

[0028]

[Table 2]

Here, the processing conditions and the like of this drying processing will be described. First, as the processing conditions, the steam heating method using the drying apparatus 1 as described above is adopted, and the steam temperature is 150.
℃, steam pressure 4.5Kg / cm ² , steam amount 160Kg /
Under the treatment condition of H, the following three samples were heat-treated for 10 minutes, and the treatment status was examined at 5 minutes and 10 minutes (that is, at the completion of treatment) from the start of the treatment.

Samples 1 to 3 were prepared as samples. Sample 1 is made by adding 1.75 kg of wood chips as a vegetable additive to 35 kg of jellyfish, and the total weight in the mixed state thereof is 36.75 kg. The wood chips were in the form of strips having a length of 5 mm to 15 mm, and fibers were present in the longitudinal direction.

Sample 2 is 35 Kg of jellyfish with 1.0 Kg of dry moss added as a vegetable additive, and the total weight of these in a mixed state is 36 Kg. Sample 3 has 35 kg of jellyfish and 1.75 K of fusuma as a vegetable additive.
The total weight in the mixed state is 36.75 Kg.

In the case of Sample 1, in the case of Sample 1, some water was accumulated at the bottom of the apparatus at the time of 5 minutes from the start of the heat drying treatment, but at the time of 10 minutes, the water was at the bottom of the apparatus. It was in a dry state. The weight of Sample 1 at this point was 4.0 Kg, and the weight before the start of treatment was 36.75 Kg.
The weight loss was 89%. Therefore, it can be said that the jellyfish are almost completely dried.

In the case of Sample 2, some moisture was accumulated at the bottom of the apparatus at the time of 5 minutes from the start of the heat-drying treatment, which was almost the same as in the case of Sample 1, but at the time of 10 minutes, moisture at the bottom of the apparatus. It was in a dry state. However, in the dry state, Sample 1 using wood chips as a vegetable additive
Was worse than the case. The weight of Sample 2 at this point was 8.5 kg, which was a weight loss rate of 76.4% with respect to the weight of 36 kg before the start of treatment. Therefore, also in the case of this sample 2, it can be said that the jellyfish is almost completely dried.

In the case of sample 3, a large amount of water is accumulated at the bottom of the apparatus at the time point when 5 minutes have passed since the start of the heat drying treatment, and the dry state is much worse than in the case of sample 1 and sample 2. Further, when 10 minutes have passed, although the degree of drying has progressed more than when 5 minutes had passed, water is still accumulated at the bottom of the apparatus, and the dry state is worse than in the case of Sample 1 and Sample 2. Therefore, with respect to this sample 3, the amount of residual water was large and the jellyfish was not completely dried, so that the weight measurement was not performed after 10 minutes.

From the above test results, it is understood that wood waste and dried moss are suitable as plant additives in the jellyfish drying treatment method of the present invention, and bran is not suitable. In particular, wood chips have a remarkable effect in shortening the drying treatment time of jellyfish when used as a vegetable additive. In the case of Sample 1 and Sample 2, both can be brought to a nearly completely dried state by the treatment time of 10 minutes, and the conventional general heat drying treatment without adding the vegetable additives shown in Table 1 above. As described above, the treatment time is halved compared to the case where the treatment time of about 20 minutes is required for complete drying.

Here, the reason why such test results are obtained will be considered. When wood chips were used as a botanical additive and mixed with jellyfish and stirred and heated, the best drying acceleration effect was observed in each sample as described above.
This is because this wood waste exhibits a high water absorption having both a water absorption effect on the cell tissue and a water absorption effect between the fibers, so that when it is mixed with jellyfish and heated while being stirred,
It is considered that the water content of jellyfish is efficiently absorbed. Therefore, it can be said that the wood chips used as the vegetable additive are preferably those having a spongy cellular tissue that easily absorbs water, or those containing many fibers.

Further, although dried moss has a sufficiently practical drying promoting action, it is somewhat inferior in drying promoting action to wood chips. This is considered to be because although the dry moss has a fine cilia structure, the length of the cilia is shorter than the fiber length of the wood chips, and the water absorption between the cilia is inferior to that extent.

On the other hand, bran is bark,
Since it has hydrophobicity as its attribute, it has low water absorption, and therefore, it is considered that when it is used as a vegetable additive, it does not show so much a drying promoting effect.

Next, in order to find out a suitable mixing ratio of the vegetable additive when the vegetable additive is added to the jellyfish to perform its drying promoting action, as shown in Table 3,
Taking as an example the case where jellyfish was mixed with wood chips as a vegetable additive, three samples were prepared and the effect of the mixing ratio of the wood chips on the acceleration of jellyfish drying was discussed.

[0040]

[Table 3]

Here, the sample 1 is a sample of 3% wood chips mixed with 35 kg of jellyfish and 1.0 kg of wood chips. Sample 2 is a sample of 4% wood chips mixed with 35 kg of jellyfish and 1.4 kg of wood chips. Sample 3 is a sample of 5% wood chips mixed with 35 kg of jellyfish and 1.75 kg of wood chips.

In the case of sample 1, the weight after 10 minutes of drying treatment is 7.5 Kg, and the weight reduction rate is 79%. In the case of Sample 2, the weight after 10 minutes of drying treatment was 5.0 kg, and the weight reduction rate was 86%. In the case of sample 3, the weight after the lapse of 10 minutes of drying treatment is 4.0K.
g, and the weight reduction rate is 89%. Here, jellyfish have a body weight of 95% water, and a weight loss rate of 8
If it is 0% or more, it is almost completely dry and there is no hindrance to incineration disposal (described below), and in terms of lowering treatment costs, the smaller the amount of plant additives, the better. In consideration of the above, when wood chips are used as the vegetable additive, it is considered that the mixing ratio is 4 to 5%.

Next, the possibility of incineration of the dried jellyfish (mixture of dried jellyfish and plant additives) was examined by a test, and the results are shown in Table 4.

[0044]

[Table 4]

Here, as shown in Table 3 above, in the case where the wood chips most suitable as the plant-based additive were used, the weight reduction ratio was 79%, which was the lowest, in Sample 1 (35 kg of jellyfish was mixed with 1.0 kg of wood chips). 100 kg was prepared as Sample 1 in this test as shown in Table 4. In addition, as a comparative example with this sample 1, a mixture of 35 kg of jellyfish and 1.0 kg of dried moss was dried for 10 minutes and the weight after treatment was 8.5 kg (weight reduction ratio of 76).
%) Was prepared as Sample 2 at 100 kg.

Table 4 shows the results of an incineration test using these gas burners. From Table 4, it can be seen that in the case of Sample 1, incineration for 3 minutes results in an ash state, the weight of which is from 100 kg before incineration to 12 kg, and when wood chips are used as the plant-based additive, it is somewhat dry. It can be seen that the incineration can be done without any problem even if the value is low. On the other hand, when dry moss was used as the plant-based additive, even if it was incinerated for 2.5 minutes, the surface of the sample turned white only and did not burn, but it was incinerated by the gas burner as in this test. However, it is considered possible to incinerate sufficiently if a method capable of high temperature incineration is used. From this result, it is understood that wood waste is the most suitable as a plant-based additive from the viewpoint of incineration after drying treatment.

As described above, according to the method for drying a jellyfish of the present invention, wood dust,
By adding an appropriate amount of a vegetable additive in the form of strips having water absorbency such as dried moss, it is possible to accelerate the drying process of the jellyfish and shorten the processing time to improve the work efficiency. is there. At the same time, since these vegetable additives have water absorbency, even if there is an incompletely dried jellyfish after the drying treatment, the water exuded from the jellyfish is absorbed by the vegetable additives. The jellyfish after the drying treatment has stable properties and maintains a solid state, so that rot will not progress.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a dryer used for carrying out a method for drying a jellyfish according to the present invention.

[Explanation of symbols]

1 is a drying device, 2 is an inner cylinder, 3 is an outer cylinder, 4 is a bottom wall, 5 is a ceiling wall, 6 is a steam jacket, 7 is a drying chamber, 8 is an inlet, 9 is a lid, 10 is a residue discharge port. , 11 are discharge gates, 1
2 is a drain port, 13 is a spiral blade, 14 is a crushing cutter, 15 is a scraping plate, 16 is an exhaust port, 17 is a blower,
Reference numeral 18 is a deodorizer, and 19 is a steam supply source.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akira Yanagihara Akira Yanagibara 3-4-1 Uenomachi, Takamatsu City, Kagawa Prefecture, Shiden Engineering Co., Ltd. (72) Nozomi Shirakami 3-chome Kaminomachi, Takamatsu City, Kagawa Prefecture No. 1 in 4 Denshi Engineering Co., Ltd. (72) Inventor, Morito Noguchi, 3-4 Uenomachi, Takamatsu City, Kagawa Prefecture No. 4 in Shinden Engineering Co., Ltd. (72) Inventor Yoshinori Moribashi, Osaka City, Osaka Nishi-Kujo 1-33-1, Hirowa Co., Ltd. (72) Inventor Hiromichi Kobayashi 1-3-3, Nishi-Kujo 1-3-3, Konohana-ku, Osaka, Osaka

Claims (1)

[Claims] 1. A method for drying a jellyfish by heating and drying the jellyfish, which comprises adding a strip-shaped plant additive having an appropriate water absorbability to the jellyfish to be dried and stirring them. A method for drying a jellyfish, which comprises heating while mixing.