JPH0316612A - Method and device for treating dust generated from incineration ash melting furnace - Google Patents

Abstract

PURPOSE:To prevent the scattering of dust by opening the tip of a waste gas pipe extending from a waste incineration ash melting furnace into a slag reservoir provided outside the furnace. CONSTITUTION:A plasma arc is generated between a plasma torch 2 in the incineration ash melting furnace 1 and an electrode 3 outside the furnace to melt the incineration ash 5 supplied to the furnace 1, and molten slag 4 is formed. The molten slag 4 overflows through an overflow pipe 6. The overflowing slag is collected in the slag reservoir 11, and the tip of the exhaust pipe 7 of the furnace 1 is dipped in the molten slag 12. An exhaust fan 14 and a stack 15 are connected to the reservoir 11, and the gas is exhausted. The dust in the waste gas in the exhaust pipe 7 is collected in the molten slag 12 and discharged from a discharge pipe 13. The generated dust is recovered in this way.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to an apparatus and method for processing dust generated in a melting furnace for melting incineration ash such as municipal waste. [Prior Art] When incineration ash is melted in a melting furnace, the generated dust is collected using a cyclone or the like, but there are the following problems. (a) It cannot be completely captured and some of it is released into the atmosphere. (b) It is difficult to process the collected dust. (C
) The dust contains harmful substances such as dioxins and heavy metals. Note that even if the collected dust is re-charged into the furnace together with the incineration ash, the particle size is so fine that it will be blown away into the exhaust gas before being melted.

[Problem to be solved by the invention]

The purpose of this project is to create a closed cycle that completely captures the dust generated from the melting furnace and prevents it from leaving the system, and to provide a technology that prevents it from scattering. [A Thousand Steps to Solve the Problems] The present invention provides a technique for solving the above problems, and specifically, by any of the following means. (a) The tip of the exhaust gas pipe led from the waste incineration ash melting furnace is opened into a slag pool provided outside the furnace, and the exhaust gas is passed through the slab melting medium. (b) The tip of the exhaust gas pipe led from the waste incineration ash melting furnace is opened into the water of a closed water tank, and a suction fan is connected to the space of the water tank. (c) In a waste incineration ash melting furnace using plasma,
After the dust in the exhaust gas is captured by the dust collector,
It is carried by the air flow and collided with the plasma flame in the furnace from behind to melt it again. (d) In a waste incineration ash melting furnace, in a device that produces wind slag from the discharged slab, dust in the exhaust gas is mixed into the compressed air used for wind slag and collided with the molten slab. Collect it as part of the slag. (e) In a waste incineration ash melting furnace using plasma,
After the dust in the exhaust gas is captured by the dust extraction device,
It is mixed into plasma gas and melted in a plasma arc. [Action J: It is not easy to remove the fine particles in the incineration ash alone. Therefore, in the present invention, it is important whether to absorb it into another medium or to remelt it. In the above method, (1) it is absorbed into the slag; ■ Grasp underwater. ■ Remelt by colliding with plasma flame. ■ The wind slag is warmed up in the wind of the wind slag device and collected together with the wind slag. ■ Confined in plasma gas. etc. Therefore, it can be collected without scattering. [Example] Example 1 Figure 1 shows an actual example of a type in which the tip of an exhaust pipe is immersed in a molten slag reservoir provided outside the furnace. The incinerated ash melting furnace 1 generates a plasma arc between the plasma torch 2 and the outer electrode 3, melts the incinerated ash 5 supplied to the melting furnace 1, and generates molten slag 4. Molten slag 4
overflows the overflow pipe 6 and flows out. In Example 1, a molten slab reservoir 11 is provided to store this overflow slag, and the tip of the exhaust pipe 7 of the melting furnace 1 is immersed in the molten slag l2 stored in the molten slag reservoir 1l. The molten slag reservoir 11 is connected to an exhaust fan 14 and a chimney 15 for exhaust. The dust mixed into the exhaust gas from the exhaust pipe 7 of the melting furnace and discharged is captured in the molten slag l2 and discharged together with the molten slab from the discharge pipe l3, and is not scattered into the air. Embodiment 2 Figure 2 shows an embodiment in which the tip of an overflow pipe 6, which serves as both a molten slab discharge passage and an exhaust gas discharge passage, is immersed in a molten slag reservoir 2L. The numbers 1-15 in Figure 2 are the lth
It is the same as the figure. In the second embodiment, as in the first embodiment, dust in the exhaust gas is extracted by the molten slab reservoir 11, and clean air is released into the atmosphere through the suction fan 14 and the chimney 15. Embodiment 3 As shown in Fig. 3, the exhaust gas pipe 7 is passed through the water tank 2l and the fan l
Aspirate with 4. The dust trapped in the water 22 is discharged together with the water from the discharge pipe 2l, the water is separated in the separation rock 24, and the dust is charged into the melting furnace l again together with the incinerated ash 5. Embodiment 4 As shown in Figure 4, dust is blown against the plasma flame in the melting furnace 1, and is instantly melted before being scattered, and is discharged as molten slag. In this embodiment, as in the second embodiment, an overflow pipe 6 is provided which shares the molten slag discharge passage and the exhaust gas discharge passage, an exhaust fan 14 and a chimney I5 are connected to the overflow pipe, and a cyclone is connected to this exhaust gas system. A dust trapping device such as the above is installed, and this dust trapping device traps 3 liters of dust, which is collected in a sealed chamber 32, placed on the blown gas of a blowing fan 33, and blown into the plasma flame in the melting furnace 1. Attach and melt. Example 5 As shown in Fig. 2315, similarly to Example 4, the dust captured by a dust trapping device such as a cyclone is placed on the airflow of 4 liters of air fan 7 for creating wind slag, and is passed through the air injection pipe 42. , the collision plate 4 together with the molten slag 43 dripping from the melting furnace.
4, the molten slab is melted together with the molten slab, and is collected as wind slag 46 by the conveyor 45. Example 6 Figure 6 shows another practical example. In the same manner as in Example 4 or 5, 3 liters of dust collected by the dust extraction device 16 is blown into the plasma gas 52 sent to the plasma torch by the fan 5 liters, and when the plasma gas becomes a plasma flame, it is melted to form a melting furnace slab. Discharge. In Example 6, as in Examples 3 and 4, the generated dust forms a closed circuit and does not leak into the outside air. [Efficacy of invention! 1! ] According to the present invention, generated dust can be collected without being released into the outside air.

[Brief explanation of the drawing]

Figure 1 is a system diagram of an embodiment in which the tip of the exhaust gas pipe is immersed in a molten slag reservoir provided outside the furnace, and Figure 2 is an overflow pipe in which the exhaust gas pipe is used in a molten slag reservoir provided outside the furnace. Figure 3 is a system diagram of an embodiment of the type in which the tip is immersed, Figure 3 is a system diagram of an embodiment of the type in which the exhaust gas pipe is connected to a water tank, and Figure 4 is an example of an embodiment of the type in which the collected dust is blown into the plasma flame in the furnace. Fig. 5 is a system diagram of an embodiment in which collected dust is mixed into the wind slag airflow, and Fig. 6 is a system diagram of an embodiment in which collected dust is mixed into plasma gas. ．． 1=-melting furnace 2...plasma torch 3...furnace outer electrode 4--molten slag 5--burning ash 6--overflow pipe 7--exhaust pipe 1 1--molten slag reservoir l2... Molten slag l3... - Discharge pipe 1 4-... Exhaust fan l5... Chimney 6- - Dust collection device l... Water tank l... Dust 2... Sealed room 3...・Blowing fan 1...Air fan 2...Blowing pipe 3...Melted slag 4...Collision plate 5...Conveyor 6...Ichihoslag 1...Ichibu fan

Claims (1)

[Claims] 1. Incineration ash characterized in that the tip of an exhaust gas pipe led from a waste incineration ash melting furnace is opened into a slag pool provided outside the furnace, and the exhaust gas is passed through the slag bath. Processing equipment for dust generated in melting furnaces. 2. A device for processing dust generated by an incinerated ash melting furnace in exhaust gas, characterized in that the tip of an exhaust gas pipe led from a waste incinerated ash melting furnace is opened into water in a closed water tank, and an exhaust fan is connected to the space of the water tank. . 3. In a waste incineration ash melting furnace that uses plasma, the dust in the exhaust gas is captured by a dust collection device, and then carried by an air flow and collided with the plasma flame in the furnace from behind to melt it again. A method for treating dust generated in an ash melting furnace. 4 In a device that produces wind slag from the slag discharged from a waste incineration ash melting furnace, the dust in the exhaust gas is mixed into the compressed air used for wind slag and collided with the molten slag to create wind slag. A method for disposing of the dust generated by the incineration ash melting furnace, which is collected as part of the collection. 5. In a waste incineration ash melting furnace using plasma, dust in the exhaust gas is captured by a dust collection device, and then mixed into the plasma gas and melted in a plasma arc. How to deal with dust.