JP3236205B2 - Artificial reef - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an artificial reef.

[0002]

2. Description of the Related Art In general, some artificial reefs submerged in the sea are constructed in a palanquin shape by a composite of metal (mainly iron is used) and concrete. To this artificial reef, SiO _2, Na ₂ O, Fe ₂ O ₃ , K ₂ O, etc. (hereinafter referred to as growth components) are added in order to grow seaweeds, phytoplankton, and the like.

[0003]

The above-mentioned conventional artificial reef is made of a composite of metal (made of steel or the like) and concrete, so that the structure is complicated and the manufacturing process becomes complicated.

[0004] In addition, there is an inconvenience that a growth component for growing seaweed, phytoplankton and the like must be separately added. On the other hand, incinerated ash such as municipal solid waste and industrial exhaust is melted into slag in order to reduce the volume and render it harmless, and research is being conducted to effectively use the slag. However, since the metal accumulated in the furnace bottom of the melting furnace contains a large amount of various components, it is used only as a weight, and the field of effective utilization is narrow.

Therefore, an object of the present invention is to provide an artificial reef which can solve the above-mentioned problems.

[0006]

Means for Solving the Problems To solve the above problems,
In the artificial reef of the present invention, the metal in the molten slag generated by heating and melting incinerated ash in an ash melting furnace is dropped into cooling water.
And solidify, and at the time of solidification,
It is made of a material obtained by the following method.

[0007] The metal produced in the ash melting furnace (hereinafter referred to as "molten metal") is remelted after cooling or cast into a mold and formed into a shape required for the artificial reef, thereby easily forming the artificial reef. It can be manufactured, and the metal generated in the ash melting furnace contains a growth component for growing attached organisms such as seaweed and phytoplankton in advance. It is also possible to eliminate the trouble of having to do so and generate a sufficient amount of attached organisms.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The artificial reef according to the embodiment of the present invention comprises molten metal 4 separated and discharged from molten slag 3 generated by heating and melting incinerated ash 1 such as municipal waste and industrial waste in an ash melting furnace 2. It is used for the material.

The ash melting furnace 2 for producing the molten metal 4 is a plasma type ash melting furnace. The furnace main body 5 is formed in an oval shape by using a refractory material.
A, 6B penetrates down into the furnace, and these electrodes 6A, 6B
Gas supply holes 6a and 6b for supplying a nitrogen gas for forming an ionized gas are formed in the axis of 6B.

An ash supply device 8 is provided at one end of the furnace body 5 for supplying a predetermined amount of incinerated ash 1 generated in an incinerator (not shown) using a pusher or the like into the furnace. A slag discharge port 10 for discharging the molten slag 3 is formed at the other end side. A heating burner 11 is disposed beside the slag discharge port 10, and the molten slag 3 is cooled by cooling water below the slag discharge port 10. There is provided a slag cooling chamber 14 for producing granulated slag 13 by cooling at 12, and the slag cooling chamber 14 is provided with a conveyor device 15 for transporting the molten slag 3 to a predetermined place.

Further, a molten slag 3 is provided on the bottom wall of the furnace body 5.
A furnace bottom 16 for storing the molten metal 4 is formed. In the ash melting furnace 2 as described above, the incinerated ash 1 supplied into the furnace main body 5 by the ash supply device 8 includes the electrodes 6A,
The molten slag 3 is melted by the generation of plasma between
Becomes The molten metal 4 in the molten slag 3 is stored in the furnace bottom 16 because of its large specific gravity, and the molten slag 3 is stored above the molten slag 3.

By the way, in order to produce the material for the artificial reef in the embodiment of the present invention, the molten slag 3 stored in the furnace bottom 16 is discharged (the molten slag 3 is made of a roadbed material, an interlocking block, etc.). The molten metal 4 stored in the furnace bottom 16 is dropped into the slag cooling chamber 14 by tilting the furnace main body 5 or by a separately provided discharge device (not shown). Then, the molten metal 4 is cooled by the cooling water 12 and is formed into a granular material containing fine bubbles.

This material is redissolved at 1450 ° to 1550 °, cast into a shape required for an artificial reef, and used as an artificial reef. Further, the molten metal 4 stored in the furnace bottom 16 is not dropped into the slag cooling chamber 14 through the casting gutter provided separately without tilting the furnace main body 5 or by the discharge device, and is directly cast into the mold. Alternatively, an artificial reef can be manufactured by cooling it to a shape required for the artificial reef.

Although the ash melting furnace 2 is of a plasma type, a material for an artificial reef is manufactured using the burner type ash melting furnace 2 in the same manner as in the case of the plasma ash melting furnace 2. You can also.

Incidentally, in the artificial reef manufactured as described above, since the molten metal 4 is used as a material, it is necessary to examine the amount of heavy metal eluted when submerged on the seabed. Here, in each of the ash melting furnaces 2 of the burner type and the plasma type, two methods as described above, namely, a case where the molten metal 4 cooled by the cooling water 12 is remelted, and a case where the molten metal 4 is cooled Metals shown in the following (Table 1) were measured for artificial reefs made by casting directly into molds without cooling in Table 12, based on the detection limits based on the provisions of the Environment Agency Notification No. 13, No. 2 of 1974. As an object, the elution amount was measured. As a result, it was found that none of the metals detected elution into the sea and met the standards set by the Environment Agency.

Table 1 shows the results after three months for the burner type ash melting furnace 2 and the results after six months for the plasma type ash melting furnace 2. Things.

[0017]

[Table 1]

Further, a test piece manufactured by each of the burner type ash melting furnace 2 and the plasma type ash melting furnace 2 and a conventional steel test piece (SS400) are immersed in the sea by a predetermined number of test pieces. The type and amount of attached organisms that occur on the artificial reef after one month (January 12, 1995) and after two months (February 14, 1995) are as follows (Table 2). Was.

According to this (Table 2), the adherent organisms generated on the conventionally used steel test pieces adhere, and after two months, their amount is smaller than the amount generated on the steel test pieces. Was found to be not inadequate.

However, in Table 2, the test pieces by the burner type ash melting furnace 2 and the plasma type ash melting furnace 2 are as follows.
An average value of two test pieces is shown, and a steel test piece is a value for one piece.

[0021]

[Table 2]

FIG. 2 shows a burner type ash melting furnace 2 (remelted test piece) and a plasma type ash melting furnace 2.
This graph shows the relationship between the immersion time h in the sea and the amount of corrosion mg / cm ² for each of the (remelted test piece and the test piece cast directly) and the conventional steel test piece. From the results, it was found that the amount of corrosion was remarkably smaller in the test piece manufactured in the plasma type ash melting furnace 2 than in the other test pieces.

As described above, according to the embodiment of the present invention,
An artificial fish reef can be easily manufactured by re-melting the molten metal 4 generated in the ash melting furnace 2 after cooling or by casting it into a mold to form a shape required for the artificial fish reef.

Further, by using the molten metal 4 generated in the ash melting furnace 2 as a constituent material of an artificial reef, the molten metal 4 which has been conventionally used as a weight can be effectively used and the molten metal 4 can be used. If the artificial reef used as the material is submerged in the sea, the molten metal 4 is safe without elution into the sea, and the molten metal 4 generated in the ash melting furnace 2 contains seaweed and phytoplankton. Since the growth component for growing the attached organisms is contained in advance, it is possible to eliminate the trouble of having to separately add the proliferation component as in the past, and to generate a sufficient amount of attached organisms. it can.

Further, in the artificial reef using the material manufactured in the plasma type ash melting furnace 2, the amount of corrosion is smaller than that of the conventional artificial reef made of steel, and the long-term use is possible.

[0026]

As apparent from the above description, the present invention is an artificial reef using the metal in the molten slag produced by heating and melting the incinerated ash in a melting furnace as a constituent material. Metal can be used effectively, and as before,
Artificial fish reefs can be manufactured more easily than when they are made of a composite of steel and other metals and concrete, and in this metal, a growth component for growing attached organisms such as seaweeds and phytoplankton. As described above, it is possible to eliminate the trouble of separately adding a growth component as in the related art.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a plasma melting furnace showing an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the time of immersion in the sea and the amount of corrosion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 incineration ash 2 ash melting furnace 3 molten slag 4 molten metal 5 furnace body 6A electrode 6B electrode 8 ash supply device 10 slag discharge port 11 heating burner 12 cooling water 13 granulated slag 14 slag cooling room 15 conveyor device 16 furnace bottom

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01K 61/00

Claims (1)

(57) [Claims] An incinerated ash is heated and melted in an ash melting furnace, and the metal in the molten slag produced is dropped into cooling water and solidified.
Material that contains air bubbles when it solidifies
An artificial reef characterized by comprising: