JP3845567B2 - Dust adhesion prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to dust that prevents dust from adhering and accumulating inside the molten slag outlet in an ash melting furnace that melts incineration ash and fly ash discharged from industrial waste treatment facilities and waste incineration facilities. The present invention relates to an adhesion preventing device.
[0002]
[Prior art]
Conventionally, for example, in a plasma melting furnace 51 which is a kind of electric melting furnace shown in FIG. 6, an object to be melted 53 such as incineration residue (incineration ash, fly ash) charged into the melting furnace body 52 is a plasma torch. The molten slag 54 is sequentially melted by the high-temperature and high-speed plasma generated in (not shown). The molten slag 54 is dropped from the melting furnace main body 52 through a molten slag outlet 55 into a water tank 56 provided below the molten slag outlet 55 and rapidly cooled and solidified in the water tank 56. The water granulated slag 57 is obtained.
[0003]
[Problems to be solved by the invention]
However, in the molten slag outlet 55 in the prior art, aerosol particles generated from the molten slag 54, especially dust and fumes (hereinafter simply referred to as “dust”) having solid properties, are particularly fused. 55 adheres to and accumulates on the lower wall of the interior (the portion indicated by arrow A in FIG. 6), and if left untreated, the dust adhered to and accumulated on the wall and the molten slag 54 discharged from the furnace are connected to generate molten slag. There is a problem that the mouth 55 is blocked. When the molten slag outlet 55 is closed as described above, it is necessary to take measures such as stopping the operation of the furnace and removing the accumulated dust, which causes a great deal of damage.
[0004]
The present invention has been made to solve such problems, and in an ash melting furnace, it is possible to prevent dust from adhering to and accumulating on the inner wall surface of the molten slag outlet. It is an object of the present invention to provide a dust adhesion preventing device that can avoid the problem of mouth clogging.
[0005]
[Means for solving the problems and actions / effects]
In order to achieve the above object, the dust adhesion preventing apparatus according to the first invention is:
A water supply means and a water storage part configured to temporarily store the water supplied from the water supply means and to overflow when exceeding a predetermined water level;
While providing the water storage section along the wall surface inside the molten slag outlet in the ash melting furnace,
The water overflowed from the water reservoir is configured to flow down along the wall surface.
[0006]
In the present invention, the water storage section provided along the wall surface inside the molten slag outlet in the ash melting furnace is configured to temporarily store the water supplied from the water supply means and to overflow when the water level exceeds a predetermined level. For this reason, water can flow uniformly from the water reservoir toward the wall surface. And since the water which flowed down uniformly from this water storage part flows down along the said wall surface, a flowing water film is formed in the said wall surface by the water which flowed down uniformly. According to the present invention, dust that adheres to the wall surface is washed away by the flowing water film, so that adhesion and accumulation of dust on the wall surface can be prevented, thereby avoiding the problem of blockage of the molten slag outlet. it can.
[0007]
In the present invention, the water supply means is configured to include one or a plurality of supply pipes connected to the water storage section for supplying water into the water storage section, and the water supply section includes a water supply direction of the supply pipe. It is preferable that a resistance member that provides resistance to the feed water flow is disposed forward (second invention). In this way, the flow of water supplied from the supply pipe into the water storage section is such that the water flows in the peripheral direction with the resistance member as a boundary, so that the water is fountained at the connection portion of the supply pipe in the water storage section. In addition to preventing overflow, it is possible to distribute the supply water evenly throughout the reservoir. Therefore, even if the amount of water supplied from the water supply means through the supply pipe varies to some extent, there is an effect that a uniform flowing water film can be formed on the wall surface.
[0008]
In the first invention or the second invention, it is preferable that a cover member for blocking dust intrusion into at least the overflow portion in the water storage section is provided inside the molten slag tap outlet (third invention). . If it does in this way, the penetration | invasion of the dust to the inside of the said water storage part will be prevented by the said cover member, and there exists an effect that it can contribute to formation of the stable flowing water film in the said wall surface.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the dust adhesion preventing device according to the present invention will be described with reference to the drawings. The present embodiment is an example in which the present invention is applied to a plasma melting furnace which is a kind of electric ash melting furnace.
[0010]
FIG. 1 shows a cross-sectional side view of an essential part of the ash melting furnace according to the present embodiment. Further, FIG. 2 shows an AA arrow view in FIG. 1, and FIG. 3 shows an BB arrow view in FIG. FIG. 4 is a structural explanatory diagram of the dust adhesion preventing device according to this embodiment.
[0011]
The ash melting furnace 1 according to the present embodiment includes a melting furnace main body 2 and a molten slag outlet 3 provided continuously to the melting furnace main body 2. The melting furnace main body 2 is equipped with a plasma torch (not shown). A plasma generation gas is supplied to the plasma torch, and a voltage is applied to generate high-temperature and high-speed plasma, and an incineration residue (incineration ash, The melted material 4 such as fly ash can be continuously melted. The molten slag outlet 3 is an opening provided in the melting furnace body 2 for allowing the molten slag 5 to flow out of the melting furnace body 2, and is directed downward from the side surface of the melting furnace body 2. Each wall portion is partitioned and formed by a rectangular cylindrical member made of a castable refractory. The lower part 3e of the molten slag outlet is formed so as to extend vertically downward, and below that, a granulation conveyor 9 and a granulation nozzle 6 in which a slag conveyor 8 is installed in a water tank 7 are attached. Has been. Here, in the lower part 3e of the molten slag tap outlet, the wall near the melting furnace body 2 is the rear wall 3a, the wall facing the rear wall 3a is the front wall 3b, and the right side when viewed from the rear wall 3a to the front wall 3b. The left and right wall portions are referred to as a right side wall 3c and a left side wall 3d, respectively.
[0012]
In the ash melting furnace 1 configured as described above, the melt 4 is continuously melted by the plasma generated by the plasma torch and sequentially overflowed from the weir 10 of the melting furnace body 2 as the molten slag 5. The molten slag 5 overflowed from the weir 10 is dropped into the water tank 7 through the molten slag outlet port 3 and is rapidly cooled and solidified in the water tank 7, and is water-crushed by the water-pulverizing nozzle 6 and water. This is crushed slag 11. The granulated slag 11 is discharged out of the system by the slag conveyor 8.
[0013]
In the ash melting furnace 1, the dust adhesion preventing device 15 of the present embodiment is provided in the molten slag tap outlet lower part 3e, and temporarily stores the water supply means 30 and the wash water supplied from the water supply means 30. The water storage unit 20 is configured to overflow when a predetermined water level is exceeded.
[0014]
As shown in FIG. 4, in the water storage section 20, a bowl-shaped member 22 is fitted in a concave groove 21 formed so as to extend in the horizontal direction along the inner wall surface at the uppermost position in the molten slag tap outlet lower part 3 e. Is formed. The concave groove 21 is engraved so as to continue over the front wall 3b, the right side wall 3c, and the left side wall 3d. The saddle-shaped member 22 is composed of two large and small equilateral angle steels 23 and 24, and one side of the smaller equilateral angle steel 24 is in a state where one side of the smaller equilateral angle steel 24 is the bottom and faces the inside. An end portion and one side end portion of the larger equilateral angle steel 23 are butted and joined to each other so as to be continuous over the front wall 3b, the right side wall 3c, and the left side wall 3d. Yes.
[0015]
In the bowl-shaped member 22, the wash water supplied from the water supply means 30 is temporarily stored in a space 25 formed by the inside of the smaller equilateral angle steel 24 and the inner side of the larger equilateral angle steel 23. . Further, when the water level of the washing water stored in the space 25 of the bowl-shaped member 22 exceeds the height H of the space 25, the overflow formed by the other side of the smaller equilateral angle steel 24 standing upright. The stored wash water overflows over the flow weir 22a. Thus, the washing water can be made to flow uniformly toward the wall surfaces of the wall portions 3b, 3c, 3d. Further, the upper end of the overflow weir 22a, which is the portion where the opening 22b of the bowl-like member 22 and the washing water overflow, is formed on the other side end of the larger equilateral angle steel 23 with respect to the inside of the molten slag outlet 3 A cover member 26 is provided so as to cover the portion, prevents dust from entering the inside of the bowl-shaped member 22, and contributes to the formation of a stable flowing water film 27 on the wall surfaces of the wall portions 3b, 3c, 3d. Has been.
[0016]
Here, the overflow weir 22a is such that the flow point of the wash water (overflow water) overflowing over the overflow weir 22a is flush with or close to the wall surface of each of the walls 3b, 3c, 3d. In this embodiment, by arranging the overflow weir 22a in the vicinity of the wall surface of each of the wall portions 3b, 3c, 3d, the downflow point is in the vicinity of the wall surface of each of the wall portions 3b, 3c, 3d. Further, by chamfering the corner portion 21a of the concave groove 21 at the flow point, the overflow water from the overflow weir 22a is smoothly and directly along the wall surfaces of the wall portions 3b, 3c, 3d. It is made to flow down.
[0017]
The water supply means 30 includes a wash water main pipe 31 embedded and arranged below the water storage section 20 and a plurality of pipes branched from the wash water main pipe 31 and connected to the bowl-shaped member 22 (this embodiment) In the embodiment, the cleaning water pipes 32 are provided. In the washing water main pipe 31, the pipe end 31 b is closed by a water stop plate 33, and the washing water supplied from the inlet end 31 a is circulated to each washing moisture pipe 32. In addition, each of the cleaning moisture pipes 32 is disposed so that the supply area of the cleaning water to the bowl-shaped member 22 is substantially equally divided. In addition, as water supply power in the water supply means 30, power for injecting water into the water tank 7 from the water breaking nozzle 6 is used.
[0018]
In the present embodiment, a flat baffle plate (resistive member) 28 is provided at an appropriate position in front of the water supply direction at a position where each cleaning moisture pipe 32 is connected in the bowl-shaped member 22 so as to be orthogonal to the water supply direction. And by fixing the end of the baffle plate 28 to the other side of the smaller equilateral angle steel 24 by welding, the water supply flow from the cleaning moisture pipe 32 is blocked and the periphery of the baffle plate 28 is taken as a boundary. It is designed to flow in a direction. In this way, it is possible to prevent the cleaning water from overflowing in the form of a fountain at the connection portion of each cleaning moisture pipe 32 in the bowl-shaped member 22, and the washing water supplied from each washing moisture pipe 32 is universally used. It is made to be able to spread within. As a result, even if the amount of cleaning water supplied from the cleaning water main pipe 31 through each cleaning moisture pipe 32 varies depending on each cleaning moisture pipe 32, the overflow weir 22a It becomes possible to overflow the washing water uniformly.
[0019]
In the dust adhesion preventing apparatus 15 of the present embodiment configured as described above, a predetermined amount of water is continuously supplied to the bowl-shaped member 22 through the washing water main pipe 31 and each washing moisture pipe 32 to form a bowl-like shape. After being temporarily stored in the space 25 of the member 22, it overflows from the overflow weir 22a and flows down toward the wall surfaces of the wall portions 3b, 3c, 3d, and the wall portions 3b, 3c are washed down by the washed water. , 3d is formed on the wall surface. Then, in the molten slag tap outlet lower part 3e, the dust which is about to adhere to the wall surfaces of the walls 3b, 3c, 3d is washed away by the flowing water film 27 and dropped into the water tank 6. In this way, the adhesion and accumulation of dust on the wall surfaces of the respective wall portions 3b, 3c, 3d are prevented.
[0020]
According to the present embodiment, the adhesion and accumulation of dust in the molten slag tap outlet lower portion 3e is prevented, so that the molten slag tap outlet 3 can be prevented from being blocked in advance, and the ash melting furnace 1 can be operated continuously. It becomes possible. Further, since the wash water that has flowed down to the wall surfaces of the walls 3b, 3c, 3d is dropped into the water tank 7 of the granulating conveyor 9, there is an advantage that a separate water treatment device is not required. Moreover, since the motive power which injects water from the granulation nozzle 6 is used for the water supply motive power in the water supply means 30, the structure can be simplified. Moreover, since there is no mechanical part penetrating the inside and outside of the furnace, the airtightness of the ash melting furnace 1 can be maintained. Moreover, since it is a simple structure and can be washed with water, there is an advantage that maintenance is easy and management is easy.
[0021]
With respect to the dust adhesion preventing apparatus 15 of the present embodiment, the following test was performed in order to derive the optimum conditions for obtaining a uniform flowing water film 27.
[0022]
Test 1: A test for determining the best arrangement of the cleaning moisture piping 32.
Dust adhesion according to the present embodiment using a bowl-shaped member 22 composed of two equal side angle steels 23 and 24 having a nominal size of 50 × 50 × 6t and 65 × 65 × 6t, and a cleaning moisture pipe 32 having a nominal diameter of 25 In the prevention device 15, an experiment was performed in which the amount of water supplied, the water supply position, etc. were changed to observe the state of the flowing water film 27 formed on the wall surfaces of the walls 3b, 3c, 3d. As a result, it can be seen that it is best to set the range covered by one cleaning moisture pipe 32 in the bowl-shaped member 22 to 250 to 300 mm centering on the water supply port, and in order to obtain a uniform flowing water film 27, FIG. It was confirmed that the arrangement (six locations) of the cleaning moisture piping 32 as shown in FIG.
[0023]
Test 2: Test for confirming the effect of the baffle plate 28.
In the case where the baffle plate 28 is omitted in the dust adhesion preventing device 15 of the test 1 in which the cleaning moisture pipe 32 is arranged as shown in FIG.
(1) Supply water amount: 130 L / min
Water becomes fountain-like from the water supply part, and the flowing water film 27 does not become uniform. ... Judgment ×
(2) Supply water amount: 50 L / min
Although the flowing water film 27 becomes uniform, it cannot cope with fluctuations in the amount of water. ... Judgment ×
[0024]
Test 3: A test to determine the optimal water supply.
In the dust adhesion preventing apparatus 15 of the test 1 in which the cleaning moisture pipe 32 is arranged as shown in FIG.
(1) Water volume: 130 L / min
Water did not form a fountain from the water supply section, and the flowing water film 27 was uniform. ... Judgment ○
(2) Water volume: 70 L / min
The flowing water film 27 is uniform and can cope with fluctuations in the amount of water. ... Judgment ○
(3) Water volume: 50 L / min
Although the flowing water film becomes uniform, it cannot cope with fluctuations in water volume. ... Judgment ×
(4) Water volume: 20 L / min
Although the flowing water film becomes uniform, it cannot cope with fluctuations in water volume. ... Judgment ×
[0025]
From the results obtained from the above test, in order to stably form the uniform flowing water film 27,
(1) The cleaning water pipe 32 is arranged as shown in FIG. 5 (six locations). (2) The supply water amount is 70 L / min to 130 L / min. (3) The baffle plate 28 is provided in front of the water supply port. I got the conclusion that it was necessary.
[0026]
In accordance with the gist of the present invention, the dust adhesion preventing device 15 of the present embodiment is applied as a dust adhesion preventing device such as a combustion chamber or a temperature reducing tower in a garbage incineration facility by adopting a structure that allows washing water to flow down. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of an essential part of an ash melting furnace according to the present embodiment.
FIG. 2 is an AA arrow view in FIG. 1;
FIG. 3 is a view taken along arrow BB in FIG. 1;
FIG. 4 is an explanatory diagram of the structure of the dust adhesion preventing device according to the present embodiment.
FIG. 5 is a diagram showing the best arrangement of cleaning moisture piping.
FIGS. 6A and 6B are diagrams for explaining an ash melting furnace according to the prior art, and are (a) a side cross-sectional view of a main part and (b) a plan cross-sectional view of a main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ash melting furnace 3 Molten slag outlet 5 Molten slag 15 Dust adhesion prevention apparatus 20 Water storage part 21 Recessed groove 22 Gutter-shaped member 26 Cover member 27 Flowing film 28 Baffle plate 30 Water supply means 31 Washing water main piping 32 Washing water piping

Claims (3)

A water supply means and a water storage part configured to temporarily store the water supplied from the water supply means and to overflow when exceeding a predetermined water level;
While providing the water storage section along the wall surface inside the molten slag outlet in the ash melting furnace,
A dust adhesion preventing apparatus configured to cause water overflowed from the water storage section to flow down along the wall surface. The water supply means is configured to include one or a plurality of supply pipes connected to the water storage section for supplying water into the water storage section, and the water supply flow in the water storage section is forward of the water supply direction of the supply pipe. The dust adhesion preventing apparatus according to claim 1, wherein a resistance member is provided so as to have a resistance of 10 μm. The dust adhesion preventing apparatus according to claim 1, wherein a cover member that blocks dust from entering at least an overflow portion in the water storage section is provided inside the molten slag outlet.

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