JP2003329226A - Method and device for treating ash and collected dust powder for melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow to reheat ash and dust generated during burning garbage and to make them into slag without flying them around. <P>SOLUTION: A melting furnace 1 and gas processing equipment (a combustion furnace 2, a heat exchange chamber 3 and a temperature-lowering tower 4) processing gas discharged from the melting furnace are communicated in series, the ash discharged from the combustion furnace 2, the heat exchange chamber 3 and the temperature-lowering tower 4 is received in a conveyer room 11 having a hermetically closed structure. The temperature-lowering tower 4 is communicated with a second separator 18, a solid component is separated, the ash discharged from the conveyer room 11 and the solid component discharged from the second separator 18 are led to a first separator 16 through a pipe line 15, and the solid component is separated again. Separated gas is discharged to the outside, and the solid component is introduced to a molding device 34 to be molded into a solid block A of a prescribed size. A closed circuit where the solid block and separately supplied auxiliary material B are re-charged into the melting furnace 1 together is provided to melt the solid component. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash / dust collecting powder processing method and apparatus in a melting furnace.

[0002]

2. Description of the Related Art A melting furnace for incinerating various kinds of waste material makes it possible to recycle it as a resource for other purposes by melting the inorganic content in the waste material at a high temperature, converting it into slag, and collecting it.

The above melting furnace is generally a gas combustion furnace (chamber),
It is composed of a heat exchange room and a cooling tower (room) of the boiler tower.
In such a melting furnace, a gas combustion furnace, a heat exchange chamber,
The ash discharged from the cooling tower may be discharged as a large lump, so that the ash is transported using a plurality of belt conveyors.

Fly ash not collected at the time of discharge is added with slaked lime and activated carbon as a measure for removing toxic gas, filtered by a separator such as a bag filter and conveyed to a fly ash treatment facility, where dioxins are removed. It is designed to be granulated so as not to be eluted, transported to the outside of the incinerator, and discarded.

Further, the environmental dust collected by collecting the dust generated during the transportation of the auxiliary raw material for the melting furnace is also conveyed by using a plurality of belt conveyors, and is transferred to the melting furnace in a fine powder state. It is designed to be turned on again.

[0006] The wastes slagged, especially granulated slag in the melting furnace, are used as concrete aggregates in the civil engineering construction industry because they do not elute dioxin and have a stable particle size. There is.

[0007]

However, in the above-mentioned conventional processing means, as described above, the ash discharged from the gas combustion furnace of the melting furnace, the heat exchange chamber, and the temperature reducing tower is discharged as a large mass. In some cases, it is necessary to install multiple belt conveyors, which requires large equipment.Since the ash discharged from the melting furnace contains dioxin, the discharged large lumps must be handled manually. There was a problem that it could not be entrusted to and processed.

On the other hand, the fly ash treated material is a waste material against which dioxins have been taken, but at present, it has not yet been attempted to be reused as a concrete aggregate or the like in the general civil construction industry.

Further, the environmental dust collected by collecting the dust generated during the transportation of the auxiliary raw material for the melting furnace is a fine powder, so even if it is re-charged into the melting furnace, it is collected again by the dust collector. It was extremely difficult to melt.

In view of this, the present invention has been made to solve the problems of the prior art.

[0011]

As a means for solving the above-mentioned problems, the present invention communicates a melting furnace with a gas processing equipment for processing gas discharged from the melting furnace, and discharges the gas from the gas processing equipment. While receiving the ash into the conveyor chamber having a closed structure, the ash and the solid components discharged from the conveyor chamber are guided to a separator through a pipe to separate the solid components, and the separated gas is purified and discharged to the outside. Together with the solid component, the solid component is introduced into a molding device to be molded into a solid block of a predetermined size, and the solid component is formed by forming a closed circuit for re-injecting this solid block and auxiliary materials supplied separately into the melting furnace. The present invention resides in a method for treating ash / dust collecting powder in a melting furnace, which is characterized by performing melting treatment, and a treatment apparatus used for carrying out the method.

A separate separator is connected to the gas treatment facility to separate solid components in the gas from the gas treatment facility,
It is preferable to send the separated solid component to the separator of the molding apparatus in order to enhance the recovery efficiency of the solid component.

As a result, after separating the ash and dust discharged from the gas treatment equipment into a gas and a solid component by a separator, the solid component is molded into a solid block by a molding device, and the solid block together with auxiliary materials. Since it is re-charged into the melting furnace to be melted, the solid component to be re-charged is reliably melted without flying.

Further, since the ash and dust discharged from each part can be guided to the molding apparatus in a substantially sealed state, the working environment is greatly improved.

When an environmental dust collector is connected so as to communicate with the pipe leading to the separator, the ash and dust floating in the air are captured and the solid components are also solidified by the molding device. Since it can be made into blocks, the working environment can be further improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows an overall configuration of an embodiment of the present invention. A melting furnace 1 and a combustion furnace 2 (secondary combustion furnace) for burning gas as a facility for processing gas generated by the melting furnace 1 are shown. ), A heat exchange chamber 3 (boiler) for exchanging heat with the combustion gas from the combustion furnace 2 to recover exhaust heat, and a temperature reducing tower 4 for reducing the temperature of the combustion gas. The exhaust ports 2a, 3a, 4a at the lower ends of the combustion chamber 2, the heat exchange chamber 3, and the temperature reducing tower 4 are communicated with the conveyor chamber 11 via valves 8, 9, and 10.

The conveyor chamber 11 has a hermetically sealed structure, and a conveyor 12 including a belt, a screw, etc. is disposed inside the conveyor chamber 11, and the ash discharged from the discharge ports 2a, 3a, 4a is placed on the conveyor 12. Receive and conveyer room 11
It is configured to be conveyed to the discharge port 11a at the end of the.

A crusher 13 is provided at the discharge port 11a of the conveyer 11 so that the ash discharged in the form of lumps is finely crushed and discharged into the pipe line 15 through the valve 14.

The pipe 15 is extended and connected to a separator 16 (referred to as a first separator) for separating a solid component and a gas. As the separator 16, a bag filter structure is suitable.

A side portion of the temperature reducing tower 4 is connected to a separator 18 (referred to as a second separator) through a communication passage 17. The second separator 18 is provided with a bag filter 19 at its upper portion and a conveyor 20 made up of a belt, a screw or the like is provided at the lower portion thereof, and conveys the collected solid components to the discharge port 18a, From this discharge port 18a to the valve 21
It is designed to be discharged to the pipe line 22 via.

The pipe line 22 is connected to the pipe line 15 through an automatic three-way valve 23. Further, the communication passage 17 is provided with an addition section 24 for slaked lime, activated carbon or the like.

On the other hand, in the illustrated embodiment, the pipe 15
The environmental dust collector 25 is connected to. This environmental dust collector 2
5 has a structure similar to that of the second separator 18, in which a bag filter 26 is provided in the upper part and a conveyor 27 is provided in the lower part, and the solid components carried to the end thereof are discharged from a discharge port 25a through a valve 28. Is discharged to a pipe line 29, which is communicated with the pipe line 15 through an automatic three-way valve 30.

A suction blower 31 is connected to the upper portion of the first separator 16 so that the air separated and separated from the solid components in the first separator 16 is discharged to the outside. The solid component discharge port 16a of the damper 3
It is communicated with the molding device 34 via 2, 33.

The molding device 34 includes the first separator 16
In order to automatically mold the solid component separated from the gas into a solid block A having a predetermined size, a device as illustrated in FIG. 2 is used, and the solid block A molded by the molding device 34 is It is designed to be charged into the melting furnace 1 through a pipe 35, and a damper 36 is provided in the middle thereof.

The molding device 34 is the same as the first separator 1.
Shoot 3 for receiving solid components such as ash separated in 6
Charger 38 that doubles as storage is at the bottom of 7
The charger 38 is slidably provided on the shaft 9 and is reciprocally movable by a cylinder 40 between a receiving position shown by a solid line and a filling position shown by a chain line in FIG. Three
Reference numeral 7a denotes a shutter that opens and closes the lower end of the chute 37.

Immediately below the base 39 at the filling position, a molding space 41a for molding a solid component into a solid block A is formed.
The molding frame 41 having the
The lower surface of the molding space 41a is opened and closed by a shutter plate 43 that reciprocates by a cylinder 42.

A punch 44 is press-fitted into the molding space 41a of the molding frame 41. This punch 4
4 is suspended and supported by an elevating frame 46 that is elevated by cylinders 45, 45, and the punch 44 is pressed into the molding space 41a by the shortening operation of the cylinders 45, 45 to mold the solid component into the solid block A. .

Reference numeral 47 is a passage for directly guiding a solid component having a predetermined size or more and not floating in the melting furnace 1 to the melting furnace 1 by bypassing the molding apparatus 16, and 48 is a size of the solid component. The mesh which classifies is shown.

Therefore, the size of the solid component separated by the first separator 16 is classified by the mesh 48, and the large-sized solid component which cannot pass through the mesh 48 is passed through the passage 47.
Then, the fine powdery solid component passing through the mesh 48 and directly to the melting furnace 1 is charged into the charger 38.

When a fixed amount of the solid component is charged, the shutter 37a is closed, and then the cylinder 40 is extended to move the charger 38 to the filling position shown by the chain line in FIG. Here, the cylinders 45, 45 are shortened and the punch 4 is moved.
4 to lower the solid component in the charger 38 to the molding frame 4
The first molding space 41a is press-fitted into the molding space 41a to be tamped and molded.

When the molding by tamping is completed as described above, the cylinder 42 is shortened from the state of FIG. 2 to open the shutter 43, and the molded solid block A is finished.
To the melting furnace 1. Then the cylinder 45,
45 expands and the punch 44 returns upward, and the cylinder 40 shortens to pull the charger 38 back to the receiving position shown in FIG. 2 and the solid line, open the shutter 37a, and move to the next operation.

As a result, the fine powdery granular solid component separated by the first separator 16 is re-charged into the melting furnace 1 as a block A having a predetermined size, and is charged into the melting furnace 1. After that, the melting process is reliably performed without flying in the furnace.

On the other hand, an auxiliary material supply system 50 is provided near the molding device 34. This subsidiary material supply system 50
Is, for example, coke, limestone or the like for promoting the combustion of the solid block A in the melting furnace 1 and having a particle size of about 20 m.
The auxiliary material B of m or more is supplied, and the auxiliary material B carried by the transportation means such as the trolley 51 is introduced into the melting furnace 1 through the pipeline 52. A partitioning damper 53 for controlling the input amount of B is provided, and a lower damper 55 is provided in the conduit 54 that joins the conduits 35. Further, a supply pipe 56 from a dust collector is connected to a pipe 54 between the lower damper 55 and the melting furnace 1.

With the above configuration, a closed-circuit processing cycle is formed through all the pipelines, and all the components are pneumatically transported by the suction air flow from the suction blower 31.

The main pipe 15 is subject to wear, mainly in the bent portion, in consideration of wear resistance of the ceramic vent pipe, castable coat or the like.
It is desirable to use 7, 57 ...

Next, the operation will be described.

Treated materials such as household waste and various industrial wastes discarded from households are put into the melting furnace 1, and the organic matter in the treated materials is thermally decomposed in the melting furnace 1 to be gasified to be inorganic. Minutes are melted and made into slag, melting furnace 1
The slag discharged from the slag is treated by the slag treatment facility.

The gasified unburned matter is sent to the combustion furnace 2 and the heat exchange chamber 3 and reburned for complete combustion. Then, the gas is discharged to the outside after the harmful gas is removed through the temperature reducing tower 4 and the second separator 18.

The ash temporarily suspended in the combustion chamber 2, the heat exchange chamber 3 and the temperature reducing tower 4 which are the gas treatment facilities spontaneously falls with the passage of time, and these ash fall into the conveyor chamber 11 having a closed structure. The hopper 13a of the crusher 13 is discharged and conveyed by the conveyor 12 from the discharge port 11a at the end thereof.
The ash that is thrown into the inside is crushed by the crusher 13 into particles having a particle size that does not hinder the pneumatic transportation, and the particles are sized. The sized ash is discharged to the pipe line 15 and carried by the air flow to the first separator 16.

On the other hand, the gas discharged from the temperature reducing tower 4 is sent to the second separator 18 through the pipe 22, is cleaned through the filter 19 of the second separator 18, and is discharged outdoors. It Further, the fine ash contained in this gas naturally falls, is carried to the discharge port 18a by the conveyor 20, and is carried by the air flow through the conduit 22 toward the first separator 16.

Dust floating indoors is collected in the environmental dust collector 25, and the dust separated here is similarly discharged from the discharge port 25a and carried by the air flow through the conduit 29 to the first separator 16. It

The ashes are collected in the first separator 16 by adjusting the flow rate by switching the automatic three-way valves 23 and 30 provided in the conduit 15 by timer control.

The ash thus sent to the first separator 16 is cleaned of the air content by the filter in the separator 16 and discharged to the outside, and the solid component is alternately discharged from the lower discharge port 16a to the dampers 32 and 33. Molding device 34 by opening and closing
Then, the solid block A having a predetermined size is molded, and the solid block A is charged into the pipe line 35 and stopped by the damper 36.

On the other hand, the auxiliary material B is put into the pipe line 52 from the carriage 51 and stopped by the damper 53.

The dampers 36 and 53 are opened at appropriate times to supply a predetermined amount of the solid block A and the auxiliary material B, and the damper 55 is opened to be charged into the melting furnace 1 and reburned.

When the solid block A and the auxiliary material B are charged, the opening / closing timings of the dampers 36, 53 and 55 are synchronized in consideration of the gas sealing property of the melting furnace 1 and the melting temperature decrease. In this way, the influence of temperature on the inside of the melting furnace 1 can be minimized.

The input timing is, for example, as follows.

To insert the auxiliary material B, first, the damper 53 is opened and the damper 55 is closed, and the auxiliary material B is stored between the dampers 53 and 55. That is, when the damper 55 receives the entire amount of the auxiliary material B charged at one time, the damper 53 is closed, and then the damper 55 is opened and charged into the melting furnace 1.

Further, switching between the damper 36 of the passage 35 on the side of the first separator 16 and the damper 55 receives a closing signal while the auxiliary material B is being supplied, and is attached to the first separator 16 at other than this timing. When the level sensor or the like is turned on, the level sensor or the like is turned off in the molding device 34.
Molding is continued until the temperature reaches F, and the dampers 36 and 55 are opened and closed to be charged into the melting furnace 1.

In this case, since the upper dampers 36 and 53 both directly receive the solid block A and the auxiliary material B, the surface is easily scratched and the sealing property is deteriorated. Then, it is better to receive it with the lower damper 55.

On the side of the molding device 34, molding is performed with the damper 36 open, the molding device 34 is stopped for each set molding amount (number of moldings), and the damper 36 is opened to connect the damper 36 and the damper 55. After being stored in the space, it is put into the melting furnace 1.

As the dampers 36, 53, 55, double flap dampers are used.

[0054]

As described above, according to the present invention, the following effects can be obtained.

Since the ash discharged from the combustion furnace, the heat exchange chamber, and the temperature reducing tower is received in the conveyor chamber having a closed structure and carried out in a lump, it is not necessary to install a plurality of belt conveyors, and the space is greatly reduced. be able to.

Since the discharged ash is treated by pneumatic transportation, the piping work can be easily carried out, which can greatly contribute to space saving and a significant reduction in equipment cost.

Since the ash is solidified into a solid block by the molding device, the ash does not scatter when it is recharged into the melting furnace, and the ash can be reliably melted.

Since the ash is solidified, the generation of dust is suppressed, and the working environment can be greatly improved in combination with the fact that the whole or most of the processing steps of the collected ash and dust can be made a closed structure.

As in the illustrated embodiment, if a crusher for crushing lumps of ash discharged from the combustion furnace, the heat exchange chamber, and the temperature reduction tower is provided, ash containing harmful substances such as dioxins is artificially added. The work environment can be made safe without the need for crushing.

Further, the influence on the temperature inside the melting furnace can be reduced by adjusting the timing of charging the solid block and the auxiliary material.

Further, if the double flap damper is used as in the embodiment, the sealing property of gas from the melting furnace can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of the present invention.

FIG. 2 is a front view with a partial cross section showing an example of the molding apparatus in FIG.

[Explanation of symbols]

1 melting furnace 2 combustion furnace 3 Heat exchange room (boiler) 4 temperature reducing tower 11 conveyor room 15 Main pipeline 16 First separator 18 Second separator 25 Environmental dust collector 31 suction blower 34 Molding equipment 37 Sub-material supply system

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27B 1/04 B09B 3/00 303L (72) Inventor Koji Ishii 4-chome, Kudankita 4-chome, Chiyoda-ku, Tokyo No. 7 Shin Kawashiro Brick Co., Ltd. (72) Inventor Keizo Nishimura No. 4-7 Kudankita 4-chome, Chiyoda-ku, Tokyo Shin Kawashiro Brick Co., Ltd. F term (reference) 3K061 AA24 AB01 AB03 BA05 DA18 DA19 3K065 AA24 AB01 AB03 BA05 HA02 HA03 3K070 DA07 DA09 DA27 DA49 4D004 AA36 AA37 CA04 CA12 CA14 CA29 CA32 CB13 CB31 CB44 CB45 CB47 CC11 CC15 4K045 BA10 GD11

Claims (6)

[Claims] 1. A smelting furnace and a gas processing facility for processing gas discharged from the smelting furnace are communicated with each other, and ash discharged from the gas processing facility is received in a conveyor chamber having a closed structure, while the ash is discharged from the conveyor chamber. The discharged ash and the solid component are guided to a separator through a pipe to separate the solid component, the separated gas is purified and discharged to the outside, and the solid component is introduced into a molding device to have a predetermined size. Ash / dust collection in a melting furnace, characterized by forming a closed block for forming a solid block and re-charging the solid block and auxiliary materials supplied separately to the melting furnace together to melt the solid components Powder processing method. 2. A melting furnace and a gas processing facility for treating gas discharged from the melting furnace are connected to each other, and the ash discharged from the gas treating facility is received in a conveyor chamber having a hermetically sealed structure, while the gas treating facility is treated. To a second separator to separate solid components, and to guide the ash discharged from the conveyor chamber and the solid components discharged from the second separator to the first separator through a pipe line to re-solidify the solid components. The separated gas is discharged to the outside and the solid component is introduced into a molding device to mold into a solid block of a predetermined size, and this solid block and auxiliary materials separately supplied together to the melting furnace. A method for treating ash and dust in a melting furnace, characterized in that a closed circuit for recharging is constructed to melt the solid component. 3. A melting furnace and a gas processing facility for treating gas discharged from the melting furnace are connected to each other, and the ash discharged from the gas treating facility is received in a conveyor chamber having a closed structure, while the gas treating facility is treated. To a second separator to separate solid components, and to separate the ash discharged from the conveyor chamber, the solid components discharged from the second separator, and the dust collected by the environmental dust collector through a pipe line. (1) The solid component is guided to the separator again to separate the solid component, and the separated gas is discharged to the outside and the solid component is introduced into the molding device to be molded into a solid block of a predetermined size, which is supplied separately from this solid block. A method for treating ash and dust in a melting furnace, characterized in that a closed circuit is reintroduced together with the auxiliary material into the melting furnace to melt the solid component. 4. A conveyor chamber having a closed structure, which connects a melting furnace with a gas processing facility for processing gas discharged from the melting furnace and receives ash discharged from the gas processing facility,
A second separator that communicates with the gas treatment facility to separate solid components, ash discharged from the conveyor chamber, and the second separator.
A first separator that receives the solid component discharged from the separator through a pipe and separates the solid component, and a molding device that receives the solid component separated by the first separator and molds it into a solid block of a predetermined size. And a sub-material supply system that re-inputs a sub-material that is separately supplied in communication with the discharge path of the solid block into the melting furnace together with the solid block, and a gate valve device that controls the supply of the solid block and the sub-material. An apparatus for treating ash / dust collection powder in a melting furnace, characterized by having a tool. 5. The ash / dust collection apparatus for a melting furnace according to claim 4, wherein an exhaust port of the environmental dust collector is connected to a pipe line leading to the first separator. 6. The gas treatment facility comprises a combustion furnace, a heat exchange chamber,
An ash / dust collecting apparatus for a melting furnace according to claim 4 or 5, comprising a temperature reducing tower.