JPH07239111A - Pretreating facility for ash melting furnace - Google Patents

Abstract

PURPOSE:To simplify the step of pretreating ash to be treated and to delete an installation space. CONSTITUTION:A large-sized article removing unit 2 for removing a large-sized solid matter from ash to be treated, a dry sorter 21 for removing predetermined or more solid matter from raw material ash in which the large-sized article is removed and drying the ash, and a magnetic sorter 9 for removing metals from the dried treated ash are provided on a pretreating route F of the ash to be treated to supply the ash containing a large quantity of moisture to an ash melting furnace 1. A dry air introducing tube 28 for introducing high temperature air heat-recovered from exhaust gas of the furnace 1 to the sorter 21 as drying air is provided. Thus, removing and drying of the solid matter are simultaneously conducted by the dry sorter.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention heats and melts incineration ash and fly ash discharged from a refuse incinerator, industrial waste, sludge (hereinafter referred to as treated ash) to detoxify and reduce the volume. The present invention relates to pretreatment equipment for an ash melting furnace.

[0002]

2. Description of the Related Art An ash melting furnace facility equipped with a pretreatment facility for stably melting incineration residue (incineration ash and fly ash = treated ash) discharged from a conventional refuse incinerator will be described with reference to FIG. To do.

For example, incineration ash discharged from the refuse incinerator is cooled by cooling water and is discharged, so that it contains a large amount of water and contains solids and metals, so that the ash melting furnace 1 is stable. In order to realize the ash supply, the following pretreatment equipment is configured to prevent adhesion to the conveyor and bridge in the hopper.

That is, in the pretreatment route F of the treated ash, the coarse metal removing device 2 removes coarse metals and coarse clinker, and then the vibrating and sieving device 3 sieves solid substances having a diameter of 50 mm or more to crusher. 4 to the vibrating screen device 2 again from the crusher 4. The treated ash having a diameter of 50 mm or less that has been sieved by the vibrating screen device 3 is supplied to the rotary kiln 6 for ash drying, and is heated by the air heater (heat exchanger) 7 of the exhaust gas treatment route G of the melting furnace 1 for drying. It is dried by the hot air introduced into the rotary kiln 6 through the air pipe 8. Then, the ash thus dried is supplied to the magnetic separator 9 to remove metals, and then the ash melting furnace 1
Is supplied to the ash supply hopper 1a.

Further, in the exhaust gas treatment route G of the ash melting furnace 1, an exhaust gas cooler 11 for cooling the exhaust gas of about 1100 ° C. from the ash melting furnace 1 to about 500 ° C., and heat exchange with the exhaust gas of about 500 ° C. 350 The air heater 7 for obtaining high-temperature air of ℃, bag filter 12 for collecting dust in the exhaust gas discharged from the air heater 7 of 200 ℃ or less,
Induction blower 13 and chimney 14 are arranged in order.
A forced air blower 16 and a first control valve 17 are interposed in the air suction pipe 15 connected to the rotary kiln 6, and the drying air pipe 8 connected to the rotary kiln 6 is ash from the outlet of the air heater 7. The combustion air supply pipe 18 connected to the melting burner 1b of the melting furnace 1 is branched, and the drying air pipe 8 is provided with a second adjusting valve 19 for adjusting the amount of air. Each of the adjusting valves 1
The openings 7 and 19 are controlled by the control device 20 that controls the melting burner 1b of the ash melting furnace 1.

[0006]

However, according to the above configuration, 1. The pretreatment process of treated ash is complicated. 2. Trouble may occur due to the complicated equipment. 3. Large installation space. There was such a problem.

The present invention solves the above-mentioned problems, simplifies the pretreatment process of treated ash, reduces troubles, and further provides a pretreatment facility for an ash melting furnace which can reduce the installation space. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for pretreating a treated ash containing a large amount of water to an ash melting furnace to treat coarse ash from the treated ash. A coarse substance removing device for removing, a dry sorter for removing solid substances having a predetermined size or more from the treated ash from which the coarse substance has been removed and drying the treated ash, and removing metals from the dried treated ash. And a magnetic air sorter, which is provided with a drying air introduction pipe for introducing high temperature air, which has been heat-recovered from the exhaust gas of the ash melting furnace, into the drying sorter as drying air.

In addition to the above construction, a moisture meter for detecting the moisture content of the treated ash discharged from the drying / sorting machine is arranged, and the drying intervening in the drying air introducing pipe is based on the detection value of the moisture meter. A control device for operating the air control valve is provided.

[0010]

According to the above construction, since the drying and sorting machine having both the solid matter removing function and the processing ash drying function is provided,
The pretreatment process of the treated ash can be simplified and the trouble can be reduced, and the installation space of the pretreatment equipment can be reduced and the ash can be made compact.

Further, since the moisture content of the dried ash is detected by the moisture meter and the control device controls the supply amount of the drying air introduced into the drying and sorting machine, the supply amount of the treated ash and the Even if the water content changes, it can be automatically dealt with, and the treated ash having a uniform water content can be continuously and stably supplied to the ash melting furnace.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ash melting furnace equipment according to the present invention will be described below with reference to FIGS. The same members as those of the related art are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 21 denotes a dry sorter which is interposed between the coarse material removing device 2 and the magnetic sorter 9 in the pretreatment route F of the treated ash, and is a solid having a diameter of 50 mm or more from the treated ash. The substance is separated and removed, and the amount of water contained in the treated ash is dried to about 5% by weight.

That is, as shown in FIGS. 2 and 3,
A sifter 23 is arranged inside the casing 22 so as to be inclined from one end side to the other end side, and an ash supply port connected to the ash outlet of the coarse material removing device 2 in the casing 22 above the one end side of the sifter 23. 24 and a drying air outlet 25 are formed.
Further, a solid material discharge port 26 is formed outside the other end of the sieving machine 23 and is configured to be sent to the crusher 4 via a transfer means (not shown). Further, an ash discharge port 27 is formed in the lower part of the sieve 23, and the combustion air supply pipe 18
A drying air supply port 29 to which a drying air introduction pipe 28 branched from is connected is formed. Further, as shown in FIG. 3, the sifter 23 has a plurality of comb blade plates 23b with a predetermined gap formed between the vibrating frames 23a attached in a stepwise manner, and an output shaft is provided on one end side of the casing 22. A vibrating device 23c connected to the vibrating frame 23a is connected and configured. In this configuration, the vibration generator 23
By applying a predetermined vibration to the comb blade plate 23b by c, the treated ash fed from the ash supply port 24 can be treated by the comb blade plate 23b.
From the treated ash outlet 27 and at the same time
The high temperature drying air supplied from the drying air supply port 29 into the casing 22 is brought into direct contact with the treated ash that slides or drops between the comb blade plates 23b to dry. As a result, it is possible to prevent the treated ash from adhering to the comb blade plate 23b. Further, solid matter that does not fall from between the comb blade plates 23b slides down on the comb blade plates 23b and is discharged to the solid matter discharge port 26,
After being crushed by the crusher 4, the crusher 4 is put into the drying and sorting machine 21 again.

In FIG. 1, an ash supply pipe 31 extending from the dry sorter 21 to the magnetic sorter 9 is provided with an infrared moisture meter 32 for detecting the moisture content of the treated ash by infrared rays, for example. Is input to the control device 33.

An adjusting exhaust pipe 34 is branched from the drying air introducing pipe 28, and the drying air introducing pipe 2 at this branch portion is branched.
8, a first drying air adjusting valve 35 is provided on the upstream side, a second drying air adjusting valve 36 is provided on the downstream side, and a third drying air adjusting valve 37 is provided on the adjusting exhaust pipe 34. Each of the drying air adjusting valves 35 to 37 is operated by the control device 33 so that the water content of the treated ash becomes about 5% by weight based on the detection value of the water content meter 32.

According to the above construction, the treatment route of the present invention is integrally provided with a solid matter removing function which requires a large volume for treatment and a treated ash drying function, and thus has the function of the conventional vibrating screen device and the rotary kiln. Since the integrated type dry sorter 21 having the function of 1 is provided, the space occupied by the pretreatment facility can be significantly reduced and the pretreatment route F can be simplified. Further, since the sorting function and the drying function are provided side by side as an integrated type, it is possible to prevent the treated ash from adhering to the solid material separating member such as the sieve 23. In this way, by integrating the sorting function and the drying function,
It is possible to reduce troubles caused by the complicated pretreatment process.

Further, the moisture content of the treated ash is detected by the moisture meter 32, and the controller 33 controls the amount of drying air introduced into the drying and sorting machine 21 based on the detected value. It is possible to stably supply the treated ash dried in an appropriate range to the ash melting furnace 1 in a stable manner in response to the variation of the supply amount of the treated ash and the variation of the water content of the treated ash.

[0019]

As described above, according to the present invention, there is provided a drying and sorting machine having a solid matter removing function (corresponding to a conventional vibrating screen device) and a drying function (corresponding to a conventional rotary kiln) integrally. Since it is provided, the pretreatment process of the treated ash can be simplified and troubles can be reduced, and further, the installation space of the pretreatment equipment can be reduced and the size can be made compact.

Further, since the moisture content of the dried ash is detected by the moisture meter and the supply amount of the drying air is controlled by the control device, the supply amount of the treated ash and the water content may vary. Even if there is, it is possible to deal with it automatically, and it is possible to continuously and stably supply the treated ash having a uniform water content to the ash melting furnace.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an ash melting furnace facility according to the present invention.

FIG. 2 is a schematic vertical sectional view showing a drying and sorting machine provided in a treated ash pretreatment route of the ash melting furnace facility.

FIG. 3 is a plan view showing a sifter of the dry sorting machine.

FIG. 4 is a configuration diagram showing a conventional ash melting furnace facility.

[Explanation of symbols]

 F Treated ash pretreatment route G Exhaust gas treatment route 1 Ash melting furnace 1a Ash supply hopper 1b Melt burner 2 Coarse material removal device 4 Crusher 7 Air heater 9 Magnetic sorter 18 Combustion air supply pipe 21 Dry sorter 22 Casing 23 Sieve unit 23b Comb blade plate 23c Vibration device 24 Ash supply port 25 Drying air discharge port 26 Solid matter discharge port 27 Solids discharge port 28 Drying air introduction pipe 29 Drying air supply port 31 Ash supply pipe 32 Moisture meter 33 Control Device 34 Adjusting exhaust pipe 35 First drying air adjusting valve 36 Second drying air adjusting valve 37 Third drying air adjusting valve

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[Procedure amendment]

[Submission date] May 31, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In FIG. 1, reference numeral 21 denotes a dry sorting machine which is interposed between the coarse material removing device 2 and the magnetic sorting machine 9 in the pretreatment route F of the treated ash. The material is separated and removed, and the amount of water contained in the treated ash is dried to about 10 to 20% by weight .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

An adjusting exhaust pipe 34 is branched from the drying air introducing pipe 28, and the drying air introducing pipe 2 at this branch portion is branched.
8, a first drying air adjusting valve 35 is provided on the upstream side, a second drying air adjusting valve 36 is provided on the downstream side, and a third drying air adjusting valve 37 is provided on the adjusting exhaust pipe 34. Each of the drying air adjusting valves 35 to 37 has a water content of 10 times as much as that of the treated ash based on the detection value of the moisture meter 32.
It is operated by the control device 33 so as to be about 20% by weight to 20% by weight .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Kono 5-3-8, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. A coarse material removing device for removing coarse solid matter from the treated ash in a pretreatment route of the treated ash for supplying treated ash containing a large amount of water to an ash melting furnace, and the ash raw material from which the coarse material is removed. From the exhaust gas of the ash melting furnace, which is equipped with a dry sorter that removes solid matter of a predetermined size or more from the ash melting source and a magnetic sorter that removes metals from the dried treated ash A pretreatment facility for an ash melting furnace, characterized by comprising a drying air introduction pipe for introducing the recovered high temperature air into the drying sorting machine as drying air. 2. A moisture meter for detecting the moisture content of the treated ash discharged from the drying / sorting machine is arranged, and a drying air adjusting valve interposed in the drying air introducing pipe is arranged on the basis of the detection value of the moisture meter. The pretreatment facility for an ash melting furnace according to claim 1, further comprising a control device that operates.