JP2002310572A - Slag cooling conveyor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the heat utilization ratio of a melting facility by recovering the heat of a slag cooling water in the melting facility of ash or the like and effectively utilizing the heat and to reduce in size a slag cooler. SOLUTION: A slag cooling conveyor system A of a melting facility comprises a case body 3 used also as a slag cooling water tank, a slag discharge conveyor 4 provided in the body 3, and a cooler 7 of a slag cooling water W1 . The conveyor system A further comprises a panel-like thermoelectric module board 9 having a thermoelectric element 9a, fixed onto the outer wall surface of the body 3. Thus, the element 9a is heated by the heat of the water W1 to execute a thermoelectric generation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag cooling conveyor device for a melting treatment facility for treating combustion residues and fly ash from municipal solid waste and refuse incinerators. To a slag cooling conveyor device that can improve the heat recovery rate of the melting processing equipment and reduce the size of the slag cooling water cooling device by driving the slag cooling conveyor device etc. with the generated power energy It is.

[0002]

2. Description of the Related Art In recent years, incineration residues and fly ash discharged from municipal refuse and refuse incinerators are often melted. This is because volume reduction, detoxification, reuse, and the like can be performed by melting the incineration residue and fly ash into granulated slag.

FIG. 4 shows an example of a slag cooling conveyor apparatus A provided in the conventional ash melting processing equipment. The slag cooling conveyor device A is disposed below the molten slag discharge port 1a of the ash melting furnace 1 so as to communicate with the molten slag discharge port 1a through a duct 2, and has a substantially rectangular cross section serving also as a cooling water tank. , A slag discharge conveyor 4 provided inside the case body 3, a driving device 5 for the slag discharge conveyor 4, and a granulated slag outlet 3d.
The sealing device 6, and is formed from the cooling water W ₁ of the cooling device 7 and the like. In FIG. 4, 3a is a bottom wall of the case body, 3b is a side wall, 3c is a ceiling wall, 3d is a granulated slag take-out port, 4a is a scraper of a slag discharge conveyor, 4b is a roller, 4c is a chain, 7a Is a cooling tower, 7b is a cooling water pump, 7c is a heat exchanger, 7d is a circulating water pump,
S is molten slag, Q is granulated slag, W ₁ is slag cooling water, and W ₂ is cooling water.

The molten slag discharge port 1a of the melting furnace 1
Is discharged from the duct 2 into the case main body 3, falls into the slag cooling water W ₁ , and is rapidly cooled to become granular so-called granulated slag Q, which is transferred onto the slag discharge conveyor 4. Settles. The precipitated granulated slag Q is scooped up by the scraper 4a of the slag discharge conveyor 4, discharged after being transported onto the water surface of the slag cooling water W _1, via a sealing device 6 from granulated slag outlet 3d to the outside Is done.

The slag cooling water W in the case body 3
₁ is extracted by the circulating water pump 7d,
After passing through c and cooled, it is returned into the case body 3. The cooling water W ₂ is supplied to the heat exchanger 7 by the cooling water pump 7b.
c, heated and returned to the cooling tower 7a, where it is cooled and circulated to the heat exchanger 7c. For example, in the case of an electric melting furnace having an ash processing capacity of about 75 T / day, during a steady operation, about 3000 to 1300 ° C. of molten slag S at a temperature of about 1300 ° C. to 1400 ° C. is discharged from the molten slag discharge port 1 a.
Hot water is continuously supplied at a flow rate of kg / H. The discharged molten slag S has an outer dimension of about 1.2 m in width, about 2 m in depth, and about 15 m in length, and enters into the case body 3 in which slag cooling water W ₁ of about 30 Ton is stored. Be dropped.

The temperature of the slag cooling water W ₁ in the case body 3 rises due to the drop of the molten slag S. But,
The slag cooling water W ₁ of about 90 T / H is circulated from the inside of the case main body 3 to the cooling device 7, where it is cooled to about 35 ° C., and the slag cooling water W ₁ is returned to the inside of the case main body 3. the average temperature of the slag cooling water W ₁ of the case body 3 is held between about 50 ° C. to 80 ° C..

[0007]

The slag cooling conveyor device A of the type shown in FIG. 4 has a large number of operation results, and is capable of performing relatively stable operation and exhibiting excellent practical utility. It is. However, the slag cooling conveyor device A still has many problems to be solved. Among them, (a) the cooling device 7 is large and it is difficult to reduce the size, and (b) the heat recovery rate of the melting treatment device is low because the heat retained in the molten slag S is not recovered. (C) The consumption of considerable energy for driving the slag cooling conveyor apparatus A remains as a problem to be solved.

[0008] The present invention has been made to solve cents in above-mentioned problems previously slag cooling conveyor device A, while recovering heat energy of the slag cooling water W ₁ as a power energy recovered electric energy using by actuating a driving device 5 of the slag cooling conveyor device a, it is provided a slag cooling conveyor device a which enables to improve the miniaturization and the heat recovery rate of the cooling device 7 of the slag cooling water W ₁ is there.

[0009]

According to the present invention, a thermoelectric element element 9a is provided on a case body 3 of a slag cooling conveyor apparatus A.
The conveyor device A is basically operated by the electric power generated by the thermoelectric element 9a. The invention according to claim 1 is provided in the case main body 3 serving also as a slag cooling water tank and provided in the case main body 3. and a slag discharge conveyor 4, the melt processing equipment provided with a cooling device 7 of the slag cooling water W ₁ in the slag cooling conveyor a, panel-shaped having a thermoelectric element elements 9a on the outer wall surface of the case body 3 The slag cooling water W
The basic configuration of the present invention is to heat the thermoelectric element element 9a by the heat of ( ₁ ) to perform thermal power generation.

According to a second aspect of the present invention, in the first aspect, the panel-shaped thermoelectric module board 9 is replaced with a panel-shaped thermoelectric module board 9 having a plurality of thermoelectric element elements 9a arranged in parallel. It is.

According to a third aspect of the present invention, in the first aspect, the thermoelectric element element 9a is a thermoelectric element element 9a having a low-temperature thermoelectric element such as a BiTe type, and the slag is cooled by generated power. The drive device 5 of the conveyor device A is operated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view in which a part of a slag cooling conveyor device to which the present invention is applied is omitted, and FIG. 2 is a schematic sectional view taken along the line II in FIG. 1 and 2, the same parts and members as those in FIG. 4 are denoted by the same reference numerals, and the slag discharge conveyor 4 is omitted.

In FIG. 1, reference numeral 9 denotes a thermoelectric module board. Granulated slag Q formed by rapid cooling of molten slag S
It is removed from the outlet 3d ₂ preparative granulated slag to the outside.
Some W ₂₁ of the cooling water W ₂ is sent to the heat exchanger 7c by the cooling water pump 7b, after being heated, a cooling tower 7
a, and after being cooled here, it is circulated to the heat exchanger 7c. Further, other part W ₂₂ of the cooling water W ₂ is sent to the cooling jacket 8 for cooling of the thermoelectric module plate 9,
After being heated, it is sent to the cooling tower 7a.

In this embodiment, a device configured to take out the granulated slag Q is used as the slag cooling conveyor device A, but the slag cooling conveyor device A may be of any type. The present invention can be applied to any device provided with the main body case 3 also serving as a cooling water tank.

The side walls 3b and the bottom wall 3 of the main body case 3
A plurality of panel-shaped thermoelectric module boards 9 each having a proper surface area are fixedly mounted on the outer surface side of a, and the thermoelectric power generated in each of the plurality of panel-shaped thermoelectric module boards 9 is a predetermined power. They are connected in combination so as to provide an output voltage and a set output.

The panel-shaped thermoelectric module board 9 has a width of about 320 mm, a length of about 40 mm, a length of about 40 mm, and a thickness of 20 to 50 mm. The module is formed into a module having an outer dimension of about 200 mm in width and about 20 to 50 mm in thickness, and is fixed to the outer surface of the steel case 3 as shown in FIG.

FIG. 3 is a schematic sectional view of the thermoelectric module board 9 used in the present invention. A plurality of thermoelectric element elements 9a are attached to the thermoelectric module board 9 side by side. The thermoelectric element element 9a includes an upper electrode piece 9a ₁
And it comprises a lower electrode pieces 9a _2, P-type thermoelectric element 9b and N at both ends and the upper electrode pieces 9a ₁ and the lower electrode piece 9a ₂
They are connected by a thermoelectric element 9c. The lower electrode pieces 9a ₂ in the low temperature side 9d ₂ For example, in the connecting upper electrode pieces 9a ₁ to the high temperature side 9d ₁ N-type thermoelectric element 9c Tc → Th
In the P-type thermoelectric element 9b, a current is generated in the direction of Th → Tc. In addition, one thermoelectric element element 9a is
As described above, the width is about 40 mm, the vertical width is about 40 mm, and the thickness is 20 to
The external dimensions are selected to be 50 mm. In FIG. 3, 5 is a driving device for the slag discharge conveyor 4, I is a generated current, 8 is a water cooling jacket, and 10a and 10b are ceramic bases.

That is, the temperature difference between the heating surface side and the non-heating surface side of the thermoelectric element 9a is about 10 ° C. to 15 ° C. (the temperature of the heating surface side (high temperature portion) is 50 ° C. to 70 ° C., When the temperature of the part (1) is 40 ° C. to 50 ° C.), each thermoelectric element 9a generates 18v, 250 mW of thermoelectric power.

More specifically, a thermoelectric element 9a having a width of about 40 mm × a vertical width of about 40 mm and a thickness of about 20 mm is used.
When a temperature difference of about 10 ° C. is maintained at 0 ° C. and the non-heating surface side temperature is 40 ° C., a thermoelectric power output of 18 v and 250 mW is obtained.

Therefore, when about 40 thermoelectric element elements 9a are assembled to form a panel-like thermoelectric module board 9 having an outer dimension of 200 mm × 320 mm, a thermoelectric power output of about 10 w (heating surface side temperature of 50 ° C., non-heating Surface side temperature 40
° C). As a result, the external dimensions of about 20
900 mm of panel thermoelectric module board 9 of 0 × 320 mm
Like the (approximately 58m ²⁾ used, slag cooling conveyor A
About 900 × 10w = 9.0 kW (18
The electric output of v) can be obtained, and can be utilized as a power source of the driving device 5 of the slag cooling conveyor device A.

The exchange efficiency of the thermoelectric energy of the thermoelectric element 9a made of BiTe used in the embodiment is about 10%. Therefore, when a total of 9.0 kW of electrical output is obtained using 900 of the panel-shaped thermoelectric module boards 9, the heat absorbed by the panel-shaped thermoelectric module boards 9 is 9.0 kw × 860 = 7740 kcal / h. . That is, the slag cooling water W ₁ in the main body casing 3 is approximately 80
Heat is absorbed at a rate of 00 kcal / h, so that the amount of heat radiation of the cooling tower 7a can be reduced by the amount of heat absorbed corresponding to 8000 kcal / h.
Can be downsized.

In this embodiment, BiTe is used as the thermoelectric element. However, if the thermoelectric element is capable of obtaining a thermoelectromotive force with considerable thermoelectric exchange efficiency,
It can be of any kind. Further, the panel-shaped thermoelectric module board 9 may be formed by a single thermoelectric element element 9a having a large heat receiving area without using a plurality of thermoelectric element elements 9a.

Although the water-cooled jacket 8 is used for cooling the thermoelectric module board 9 in this embodiment, a radiation fin may be provided. Further, in the present embodiment, the thermoelectric generation output generated by the thermoelectric module panel 9 is used as driving power for the slag discharge conveyor 4, but the thermoelectric generation output may be supplied to another electric load. Of course it is good. Furthermore,
Although the present embodiment is directed to a slag cooling conveyor device provided with the cooling device 7 for the slag cooling water W, the present invention can of course be applied to a slag cooling conveyor device not provided with the cooling device 7. is there. In addition, although the present invention is directed to a slag cooling conveyor device provided in a melting treatment facility, the present invention can be applied to an incineration ash discharge conveyor device of a normal stoker-type incinerator.

[0024]

According to the present invention, a panel-shaped thermoelectric module board 9 is fixed to the outer surface of the main body case 3 which also serves as a cooling water tank of the slag cooling conveyor apparatus A, and the slag cooling water W _{1 is provided.}
Heat energy of the conveyer device A
It is configured to be used as a power source for driving the vehicle. As a result, the thermal utilization of the ash melting processing apparatus is further improved, thereby enabling miniaturization of the cooling device 7 of the slag cooling water W _1. The present invention has a novel and excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a slag cooling conveyor device is broken.

FIG. 2 is a schematic sectional view taken along line II in FIG.

FIG. 3 is a schematic sectional view of a thermoelectric element used in the present embodiment.

FIG. 4 is a schematic explanatory view of a slag cooling conveyor device provided in a conventional melting furnace.

[Explanation of symbols]

A slag cooling conveyor, S is molten slag, Q is granulated slag, W ₁ slag cooling water, W ₂ is the cooling water, 1 ash melting furnace, 1a molten slag discharge port, 2 duct 3 The closed case body, 3a is the bottom wall of the case body, 3b is the side wall of the case body, 3c is the ceiling wall of the case body, 3d is a granulated slag discharge outlet, 4 is a slag discharge conveyor, 4a is a scraper, 4b is a roller, 4c is a chain, 5 is a driving device,
6 is a sealing device, 7 is a cooling water cooling device, 7a is a cooling tower, 7b is a cooling water pump, 7c is a heat exchanger, 7d
Circulating water pump 8 is water-cooled jacket, 9 thermoelectric module board, 9a thermoelectric element element, 9a ₁ upper electrode piece, 9a ₂ lower electrode pieces, 9b are P-type thermoelectric element, 9c is N-type thermoelectric element, 9d ₁ the high temperature side, 9d ₂ is the low-temperature side, 10
a and 10b are ceramic bases.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 35/32 H01L 35/32 A H02N 11/00 H02N 11/00 A (72) Inventor Masaaki Kurata Hyogo 2-33, Kinrakuji-cho, Amagasaki-shi F-term in Takuma Co., Ltd. (reference) 3K061 PA02 PA14 3K065 JA18 4K056 AA05 CA20 DA05 DA31 4K063 AA04 BA13 CA07 HA03 HA10

Claims (3)

[Claims] 1. A case body also serving as a slag cooling water tank,
A slag discharge conveyer provided in a case main body, and a slag cooling conveyer apparatus of a melting processing facility provided with a slag cooling water cooling device, wherein a panel-shaped thermoelectric module having a thermoelectric element element on an outer wall surface of the case main body A slag cooling conveyor device, wherein a panel is fixed and a thermoelectric element is heated by the heat of slag cooling water to generate thermal power. 2. The slag cooling conveyor device according to claim 1, wherein the panel-like thermoelectric module board is a thermoelectric module board in which a plurality of thermoelectric element elements are juxtaposed. 3. The slag cooling conveyor device according to claim 1, wherein the thermoelectric device element is a low temperature thermoelectric device such as a BiTe system, and the driving device of the slag cooling conveyor device is operated by the generated power.