JPH09170742A - Major flying ash melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a flowing-out of flying ashes toward a discharging port, avoid a damage of a furnace wall and enable flying ash after melting to be positively recovered together with major molten ashes by a method wherein some flying ashes on a floor of a flying ash furnace is melted by heat held in the molten ash dropped from a floor of a major ash furnace. SOLUTION: As major ashes 9 are fed from a major ash feeding port 1, major ashes 9 are melted by burners 3 oppositely installed on a major ash furnace floor 2 and then the ashes are naturally dropped onto a floor 5 of a flying ash furnace. The major molten ashes 9 naturally dropped melt the flying ashes 10 on the floor 5 of the flying ash furnace with their retained heat, the molten flying ashes 10 drop into a water-sealed tank 6 together with the molten major ashes 9. At this time, the floor 5 of the flying ash furnace is increased in its temperature by a temperature increasing device 11, resulting in that a melting with the retained heat can be performed smoothly. Since the floor 2 of the major ash furnace and the floor 5 of the flying ash furnace are inclined in a downward direction, the molten ashes are smoothly dropped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main ash fly ash melting furnace.

[0002]

2. Description of the Related Art When ash is melted by burning with a burner or the like, there is usually only one melting chamber in the melting furnace, and there is a structure in which only the mixed ash of the main ash and the fly ash or the main ash is melted. Melting by combustion of fly ash alone requires special treatment before or during the introduction of fly ash. In electric melting, the electrode or base metal is in contact with molten ash.

[0003]

[Problems to be Solved by the Invention] When ash is melted by burning a burner or the like, a light ash such as fly ash rises due to combustion gas from the burner and becomes difficult to melt. Most of the soared ash is not melted and is discharged together with the combustion exhaust gas. The ash discharged without melting from the furnace is normally collected by a dust collector,
The more ashes rise, the more frequently the filters will be replaced. The ash that has melted in the high-temperature combustion gas and adhered to the furnace wall and the melted ash that has adhered to the furnace wall corrode and damage the furnace wall. Originally, main ash and fly ash are separately collected as a result of incineration, but they are usually mixed and melted. In the melting of fly ash, a special treatment must be performed before or during the charging of the ash before melting the ash. In the electric melting, the molten ash has a structure in which the electrode and the base metal are in direct contact with each other, so that corrosion at the contact portion is a problem.

[0004]

In order to solve the above problems, the present invention provides a main ash hearth below a main ash inlet,
A burner is provided so as to face the main ash hearth, a fly ash inlet is provided in the lower part of the main ash hearth, and a fly ash hearth communicating with the main ash hearth is provided. The main ash fly ash melting hearth is characterized in that the fly ash on the fly ash hearth is melted by the retained heat of the molten ash falling from the floor.

In order to solve the above-mentioned problems, the present invention also provides a main ash fly ash melting furnace, characterized in that the main ash hearth is inclined downward toward the downstream side.

Further, in order to solve the above-mentioned problems, the present invention provides a main ash fly ash melting furnace in which the fly ash hearth is inclined downward toward the downstream side. .

In order to solve the above problems, the present invention also provides a main ash fly ash melting furnace in which a water sealing tank is provided under the fly ash hearth.

In order to solve the above problems, the present invention also provides a main ash fly ash melting furnace in which an extruding device is provided below the main ash inlet.

In order to solve the above-mentioned problems, the present invention provides a main ash fly ash melting furnace characterized in that an ash extrusion device is provided at a fly ash introduction port.

In order to solve the above-mentioned problems, the present invention provides a main ash fly ash melting furnace characterized in that an exhaust part is provided on the main ash hearth side above the fly ash hearth. Is.

In order to solve the above-mentioned problems, the present invention is characterized in that the exhaust part is provided in the vicinity of a communication part between the main ash hearth and the fly ash hearth. A melting furnace is provided.

Further, in order to solve the above-mentioned problems, the present invention provides a main ash fly ash melting furnace characterized in that an exhaust portion is formed on a peripheral wall of a fly ash hearth.

In order to solve the above-mentioned problems, the present invention also provides a main ash fly ash melting furnace, characterized in that the exhaust part is formed in the lower part of the fly ash hearth.

Further, in order to solve the above-mentioned problems, the present invention is characterized in that the fly ash hearth is heated by a temperature raising device by indirect heating by combustion or electric heating to raise the temperature of fly ash. The main ash fly ash melting furnace is provided.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Reference numeral 1 denotes a main ash introduction port, and 2
Is the main ash hearth constructed below. This main ash hearth 2
The burner 3 is installed so as to face the above. Below the main ash hearth 2, a fly ash inlet 4 is provided, and a fly ash hearth 5 communicating with the main ash hearth 2 via a communication part 12 is provided. The fly ash on the fly ash hearth 5 is melted by the retained heat of the molten ash falling from the above. Further, the main ash hearth 2 and the fly ash hearth 5 are configured to be inclined downwards toward the downstream side, and a water sealing tank 6 is provided below the fly ash hearth 5. Further, an ash extrusion device 7 is provided below each of the main ash inlet 1 and the fly ash inlet 4, and an exhaust unit 8 is provided above the fly ash hearth 5 on the main ash hearth 2 side. To do. Also,
The exhaust part 8 is a communication part 1 between the main ash hearth 2 and the fly ash hearth 5.
2 is provided in the vicinity thereof, or is provided on the peripheral wall 13 of the fly ash hearth 5, or is provided on the lower peripheral wall 14 of the fly ash hearth 5. Further, the fly ash hearth 5 is configured to be heated by a temperature raising device 11 by indirect heating by combustion or electric heating. The temperature of the fly ash 10 is raised by the temperature raising device 11.

When the main ash 9 is introduced from the main ash inlet port 1,
On the main ash hearth 2, the main ash 9 is melted by the burners 3 installed facing each other, and as shown in the drawing, is melted and naturally falls on the fly ash hearth 5. The naturally falling molten main floor 9 melts the fly ash 10 on the fly ash hearth 5 due to its retained heat, and the melted fly ash 10 falls into the water sealing tank 6 together with the molten main ash 9. At this time, the fly ash hearth 5
When the temperature is raised by 1, the melting due to the retained heat is smoothly performed. Since the main ash hearth 2 and the fly ash hearth are inclined downward, the molten ash drops smoothly. Moreover, you may operate | move the extrusion apparatus 7 as needed and accelerate | stimulate melting, and you may make a molten bed fall.
Since the combustion gas is heated from the surface of the main ash 9 and is heated and melted from the surface, the main ash 9 before melting is covered with the melted main ash 9 and the main ash is not scattered. The same is performed by the falling molten ash 9 on the fly ash hearth 5. Since the fly ash hearth 5 is heated by the temperature raising device 11, the fly ash 10 is not cooled by the hearth 5,
The temperature of the fly ash 10 is effectively raised. From the above, there is no ash scattering, and since the exhaust part 8 is provided on the main ash hearth 2 side on the fly ash hearth 5, there is no outflow of fly ash from the exhaust part 8. When the exhaust part 8 is provided in the vicinity of the communication part 12, the combustion gas passes around the molten ash and maintains the temperature of the molten ash, which prevents the molten ash from condensing and enhances the heat of fusion of the fly ash. It will be. In this case, by making the exhaust portion 8 relatively large, the flow velocity of the exhaust gas can be reduced to the extent that ash does not fly. In addition, the exhaust unit 8 is attached to the peripheral wall 13 of the fly ash hearth 5.
The temperature rise of the fly ash 10 can be improved by providing the above. Also in this case, by making the exhaust portion 8 relatively large, the flow velocity of the exhaust gas can be reduced to the extent that ash does not fly. Further, the exhaust part 8 is provided on the lower peripheral wall 14 of the fly ash hearth 5 to improve the temperature rise of the molten fly ash 10,
The temperature of molten ash is prevented from lowering, the condensation of molten ash is prevented, and the heat of fusion of fly ash is increased. Also in this case, by making the exhaust portion 8 relatively large, the flow velocity of the exhaust gas can be reduced to the extent that ash does not fly.

[0017]

As described above, the present invention has the following effects. In the past, in combustion-type melting, lightweight ash such as fly ash was scattered in the furnace by the combustion gas and was mostly discharged from the exhaust port together with the combustion gas. Even if the soared ash melts, it adheres to the furnace wall and damages the furnace wall, and it is often impossible to recover the ash after melting. The present invention does not cause the fly ash to be scattered in the furnace so that the fly ash does not flow out to the exhaust port, damage to the furnace wall can be avoided, and the fly ash after melting can be reliably collected together with the molten main ash. is there. In combustion type melting,
It has been extremely difficult to melt the fly ash alone for the above reasons. Therefore, when the fly ash is melted, it is necessary to perform a special treatment before or at the time of charging it into the furnace, but according to the present invention, the fly ash can be melted without any special treatment.
Although there are some cases in which fly ash does not scatter in electric melting, damage due to corrosion of the electrode or base metal in contact with the molten ash was a problem, but in the present invention, there is no contact surface with molten ash, so corrosion It is possible to avoid damage to the furnace wall due to.

[0018]

[Brief description of the drawings]

FIG. 1 is a systematic explanatory view of the present invention.

[Explanation of symbols]

 1 Main ash inlet 2 Main ash hearth 3 Burner 4 Fly ash inlet 5 Fly ash hearth 6 Water sealing tank 7 Ash extruding device 8 Exhaust part 9 Main ash 10 Fly ash 11 Temperature raising device 12 Communication part 13 Fly ash furnace Floor wall 14 Fly ash furnace floor bottom wall

Claims (11)

[Claims] 1. A main ash hearth is formed below the main ash inlet,
A burner is provided to face the main ash hearth, a fly ash inlet is provided at the bottom of the main ash hearth, and a fly ash hearth that is in communication with the main ash hearth via a communication part is provided. A main ash fly ash melting furnace, characterized in that the fly ash on the fly ash hearth is melted by the retained heat of the molten ash falling from the main ash hearth. 2. The main ash fly ash melting furnace according to claim 1, wherein the main ash hearth is inclined downward toward the downstream side. 3. The main ash fly ash melting furnace according to claim 1, wherein the fly ash hearth is inclined downward toward the downstream side. 4. The main ash fly ash melting furnace according to claim 1, wherein a water sealing tank is provided below the fly ash hearth. 5. The main ash fly ash melting furnace according to claim 1, wherein the main ash inlet is provided with an ash extrusion device. 6. The main ash fly ash melting furnace according to claim 1, 2, 3 or 4, wherein an ash extrusion device is provided at a fly ash introduction port. 7. The main ash fly ash melting furnace according to claim 1, wherein the exhaust part is provided on the main ash hearth side above the fly ash hearth. 8. The exhaust part is provided in the vicinity of a communication part between the main ash hearth and the fly ash hearth.
Main ash fly ash melting furnace according to 3, 4, 5 or 6. 9. The main ash fly ash melting furnace according to claim 1, wherein the exhaust part is formed on a peripheral wall of the fly ash hearth. 10. The main ash fly ash melting furnace according to claim 1, 2, 3, 4, 5 or 6, wherein the exhaust part is formed in a lower portion of the fly ash hearth. 11. The fly ash hearth is heated by a temperature raising device by indirect heating by combustion or electric heating to raise the temperature of fly ash. , 6,
Main ash fly ash melting furnace according to 7, 8, 9 or 10.