JP4806844B2 - Rotation prevention device for marine organisms - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for preventing the occurrence of rot odor of marine organisms, and in particular, efficiently prevents the odor of marine organisms such as jellyfish collected from the screen of a cooling water intake of a thermal power plant or nuclear power plant. It relates to the device.
[0002]
[Prior art and prior art]
In plants such as power plants, chemical complexes, and steelworks, seawater is used in large quantities as industrial cooling water, but if jellyfish and other marine organisms rushed to the seawater channel for seawater sampling are left unattended In order to cause various obstacles such as piping blockage, reduction in seawater sampling volume, cooling efficiency, equipment failure, equipment operation efficiency such as power generation equipment, etc. Kakiage is collected. The collected jellyfish, etc. are transported by a draining conveyor, temporarily stored in a jellyfish storage tank (primary storage tank), and when this storage tank is full, it is transferred to another secondary storage tank by a pump and disposed. Corruption of marine organisms such as jellyfish began, and a foul odor was generated, which caused problems such as deterioration of the working environment and complaints from the surrounding residents.
[0003]
Such a rotting odor of marine organisms is mainly caused by hydrogen sulfide (H ₂ S), methyl mercaptan (MM), ammonia (NH ₃ ), etc. generated by the rotting of marine organisms.
[0004]
Conventionally, masking agents, metal salts, chlorinated oxidants, and nitrates (Japanese Patent Laid-Open No. 10-330206) are used to prevent the rot odor of marine organisms.
[0005]
Japanese Patent Application No. 11-298570 proposes a rotting odor inhibitor containing aluminum sulfate or a salt thereof, such as potassium alum.
[0006]
In particular, potassium alum or nitrate can provide a good antiseptic odor effect.
[0007]
[Problems to be solved by the invention]
Conventionally, however, these anti-corrosion odors are administered to the primary storage tank and the secondary storage tank by sprinkling with a ladle, a bucket, or by injecting with a pump. It was difficult to administer an appropriate amount with respect to the amount of organisms, resulting in excessive or insufficient drugs. Also, the work is complicated because it requires manpower. In particular, when a large amount of jellyfish is fried, it is difficult to measure the amount of jellyfish that is continuously added, and in many cases, the odor of spoilage cannot be prevented due to a shortage of the amount of medicine injected.
[0008]
The present invention solves the above-mentioned conventional problems, and can automatically inject an appropriate amount of anti-septic odor according to the amount of marine organisms such as jellyfish, which reduces the amount of chemical injection work. In addition, an object of the present invention is to provide a device for preventing the occurrence of rot odor of marine organisms, which can prevent the odor of rot of marine organisms reliably by preventing excess and deficiency of drugs.
[0009]
[Means for Solving the Problems]
The apparatus for preventing the occurrence of rot odor of marine organisms of the present invention includes a storage tank for storing marine organisms, a transfer means for separating marine organisms from seawater and transferring them to the storage tank, an operating device for the transfer means, It is provided with a chemical injection device for adding aluminum potassium sulfate AlK (SO ₄ ) ₂ or sodium aluminum sulfate AlNa (SO ₄ ) ₂ as an anti- corrosion agent to the marine organisms that are transferred to the storage tank in conjunction. It is characterized by.
[0010]
With the apparatus for preventing the generation of rot odor of marine organisms of the present invention, the amount of marine organisms such as jellyfish pulled up can be changed by injecting a rot odor inhibitor in conjunction with the means for transferring marine organisms. Corresponding appropriate chemical injection can be performed, and the rot odor can be prevented easily and reliably without requiring manual labor.
[0011]
That is, in general, marine organisms such as jellyfish are fried by a screen, enter a side groove provided on the side, and are sent to a draining conveyor by a water flow. Then, water is transferred while being separated by a draining conveyor, and marine organisms such as jellyfish are introduced into the storage tank.
[0012]
Therefore, automatic chemical injection can be performed by operating the injection pump of the antiseptic odor in conjunction with the draining conveyor. In particular, since the draining conveyor can change the number of rotations according to the amount of jellyfish and other marine organisms withdrawn, the injection rate of the rot odor inhibitor can be adjusted by controlling the chemical injection pump in proportion to the number of rotations. For example, an appropriate amount of medicine can be injected according to the amount of marine organisms such as jellyfish.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a schematic view showing an embodiment of a marine organism rotting odor generation preventing apparatus according to the present invention.
[0015]
The jellyfish fried from the screen of the water intake enters the side groove 1, is pushed into the water from the side groove 1, and is sent to the draining conveyor 2. In the draining conveyor 2, the water flows down through the conveyor net 2A. That is, the draining conveyor 2 is such that an endless track-like net 2A is rotated while being moved in the vertical direction by a motor, and a push-up plate 2B is attached in the width direction of the net 2A perpendicular to the surface of the net 2A. There is a structure in which jellyfish is scooped up with a plate 2B while draining water with a net 2A. The jellyfish pushed up by the draining conveyor 2 falls to the jellyfish storage tank 4 through the chute 3 and further sent to the secondary storage tank (not shown) by the transfer pump 5.
[0016]
In this embodiment, the antiseptic odor is injected by the chemical injection pump 6 to the position where the jellyfish falls from the draining conveyor 2, and this chemical injection pump 6 is linked to the operation device of the draining conveyor 2, and preferably the conveyor. Based on the rotational speed of 2, the chemical injection control is set so that the chemical injection amount is increased when the rotational speed is large and the chemical injection amount is decreased when the rotational speed is small.
[0017]
As described above, the draining conveyor 2 can change the number of rotations according to the amount of jellyfish. If the amount of jellyfish is large, the conveyor 2 is operated at high speed (high speed running). Therefore, by controlling the operation of the medicine pump 6 in proportion to the rotational speed of the draining conveyor 2, an appropriate amount of spoilage corresponding to the amount of jellyfish It can automatically dispense odor control agents.
[0018]
In addition, as a specific example of the conveyor operating device interlocked with the chemical injection pump 6 as the chemical injection device, in addition to the above-described conveyor belt (net 2A), an operation switch for running or stopping the conveyor and a rotation for running the net 2A are used. Examples thereof include a body 7 or a motor (not shown) that drives the rotating body 7.
[0019]
The amount of jellyfish is adjusted by adjusting the opening and closing of the medicinal pump 6 in conjunction with the traveling speed of the mesh 2A, the number of revolutions, the number of revolutions of the rotating body 7, the number of revolutions of the motor that drives the rotating body, and the like. The dosage can be increased or decreased depending on
[0020]
In the present invention, Ru using the or al sulfate aluminum salt which is excellent in corruption odor prevention effect as rancidity inhibitor.
[0021]
The sulfuric acid aluminum salt, sulfate aluminum potassium AlK _{(SO 4) 2} (potassium alum), aluminum sulfate Sodium AlNa _{(SO 4) 2} (sodium alum), with preference given to potassium alum.
[0022]
The addition amount of sulfuric acid aluminum salt, according to the type of corruption situation and using sulfuric aluminum salt sea棲生product be appropriately determined such that the amount of rancidity can be sufficiently prevented, generally When using a composite salt of aluminum sulfate such as potassium alum (AlK (SO ₄ ) ₂ · 12H ₂ O), 50 to 10000 mg / L, particularly 500 to 5000 mg / L with respect to marine organisms introduced from a draining conveyor. It is preferable to add so that the concentration is about L. Sulfate aluminum salts, handling property, 5 to 30 wt% from the viewpoint of such contact efficiency between the sea棲生thereof, for example, is preferably used as an aqueous solution of about 10 wt%.
[0023]
In addition, it is preferable to prepare the aqueous solution of these decay odor inhibitors by dissolving the decay odor inhibitor in seawater, industrial water, tap water or the like.
[0024]
In FIG. 1, the rot odor preventing agent is put into the jellyfish storage tank 4 at the position where the jellyfish falls, but the rot odor preventing agent may be put into any part of the jellyfish storage tank 4, and the jellyfish storage tank. It is also effective to stir 4 to make it uniform.
[0025]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0026]
Example 1
The following tests were carried out using the full scale draining conveyor and jellyfish storage tank shown in FIG.
[0027]
First, the jellyfish stored in the jellyfish storage tank were allowed to stand for 10 days in a non-chemically poured state, and the jellyfish decay status in the jellyfish storage tank was determined by measuring the hydrogen sulfide (H ₂ S) gas concentration. The results are shown in FIG.
[0028]
As a result, it was confirmed that the jellyfish began to rot immediately, and the H ₂ S concentration reached 3000 to 4000 ppm after a few days.
[0029]
Next, a test was performed by operating a chemical injection pump in conjunction with a draining conveyor and injecting an aqueous potassium alum solution. Jellyfish transfer and drug injection were conducted for 8 days from the start of the test, and then both jellyfish transfer and drug injection were stopped. The results are shown in FIG.
[0030]
In FIG. 2, Run-1 is the result when the chemical injection pump is operated in conjunction with the operation switch of the draining conveyor, and Run-2 is in accordance with the rotational speed of the draining conveyor, specifically the rotational speed of the net. It is a result when the amount of chemical injection is also increased or decreased. The medicinal position is where the jellyfish fall from the draining conveyor. As a result, it was confirmed that the generation of H ₂ S can be significantly suppressed by injecting potassium alum.
[0031]
However, in the case of Run-1, a change is observed in the H ₂ S concentration. This indicates that there may be cases where the amount of drug injection commensurate with the amount of jellyfish is not always sufficient.
[0032]
On the other hand, the H ₂ S concentration in Run-2 is always stable at a low level. This indicates that the medicine is being delivered following the increase and decrease of jellyfish. In addition, Run-2 is a chemical injection of 10% by weight potassium alum aqueous solution with respect to the rotation speed of the draining conveyor so that the amount of jellyfish collected by the draining conveyor is 3000 to 4000 mg / L as 12 salt of potassium alum. The amount was injected as follows.
Number of rotations of draining conveyor net Chemical dosage 0.5-2 rpm 8-35 L / min 2-3.5 rpm 35-70 L / min 3.5-5 rpm 70-150 L / min
From this result, it was confirmed that the automatic chemical injection system that operates the chemical injection pump of the rot odor prevention agent in conjunction with the drainage conveyor of jellyfish is effective in preventing the rot odor of jellyfish.
[0034]
【The invention's effect】
As described in detail above, according to the apparatus for preventing the occurrence of rot odor of marine organisms of the present invention, complicated drug injection work is not required, and the appropriate amount of the rot odor preventive agent is automatically dispensed. The amount of excess and deficiency can be prevented and the rot odor of marine organisms can be surely prevented.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of a marine organism rotting odor generation preventing apparatus according to the present invention.
2 is a graph showing daily changes in H ₂ S concentration during no drug injection in Example 1. FIG.
3 is a graph showing daily changes in H ₂ S concentration at the time of drug injection in Example 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side groove 2 Draining conveyor 3 Chute 4 Jellyfish storage tank 5 Transfer pump 6 Chemical injection pump 7 Rotating body

Claims (2)

A storage tank for storing marine organisms, a transfer means for separating marine organisms from seawater and transferring them to the storage tank;
A chemical injection in which potassium aluminum sulfate AlK (SO ₄ ) ₂ or sodium aluminum sulfate AlNa (SO ₄ ) ₂ is added as an anti- corrosion agent to marine organisms transferred to the storage tank in conjunction with the operating device of the transfer means. An apparatus for preventing the generation of rot odors of marine organisms. The transfer means is a conveyor;
2. The apparatus for preventing the occurrence of rot odor of marine organisms according to claim 1, wherein the chemical injection device performs chemical injection control of the rot odor inhibitor based on the number of rotations of the conveyor.

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