JP2880064B2 - Ash melting furnace pretreatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of heating and melting incinerated ash and fly ash, industrial waste, sludge, etc. (hereinafter referred to as treated ash) discharged from a refuse incinerator to make them harmless and to reduce their volume. The present invention relates to a pretreatment facility for an ash melting furnace.

[0002]

2. Description of the Related Art A conventional ash melting furnace equipped with a pretreatment facility for stably melting incineration residues (incinerated ash and fly ash = processed ash) discharged from a refuse incinerator will be described with reference to FIG. I do.

[0003] For example, incineration ash discharged from a refuse incinerator is cooled by cooling water and discharged, so that it contains a large amount of moisture and contains solids and metals. In order to realize the ash supply, the following pretreatment equipment is configured to prevent adhesion to the conveyor and bridging in the hopper.

That is, in the pretreatment path F of the treated ash, coarse metals and coarse clinkers are removed by a coarse substance removing device 2, and then a solid having a diameter of 50 mm or more is sieved by a vibrating sieve 3 to obtain a crusher. 4 and is supplied again from the crusher 4 to the vibrating sieve device 2. The treated ash having a diameter of 50 mm or less sieved by the vibrating sieve device 3 is supplied to a rotary kiln 6 for drying ash, and is heated by an air heater (heat exchanger) 7 in an exhaust gas treatment path G of the melting furnace 1 for drying. The drying is performed by the high-temperature air introduced into the rotary kiln 6 through the air pipe 8. The ash thus dried is supplied to a magnetic separator 9 to remove metals, and then the ash melting furnace 1
Is supplied to the ash supply hopper 1a.

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

[0006]

However, according to the above configuration, the following are required. The pretreatment process of the treated ash is complicated. 2. Complicated equipment causes troubles. 3. Large installation space. There was such a problem.

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

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a processing ash pretreatment path for supplying a processing ash containing a large amount of water to an ash melting furnace. A bulky matter removing device for removing, a solid matter having a predetermined size or more from the treated ash from which the bulky matter has been removed, and a drying sorter for drying the treated ash; and removing metals from the dried treated ash. And a drying air introduction pipe for introducing high-temperature air heat recovered from exhaust gas from the ash melting furnace to the drying sorting machine as drying air.

In addition to the above configuration, a moisture meter for detecting the moisture of the treated ash discharged from the drying and sorting machine is arranged, and the drying air interposed in the drying air introduction pipe is provided based on the detected value of the moisture meter. A control device for operating the air control valve is provided.

[0010]

According to the above construction, a dry sorter having both a solid matter removing function and a treated ash drying function is provided.
It is possible to simplify the pretreatment process of the treated ash and to reduce troubles, and further to reduce the installation space of the pretreatment equipment and make it compact.

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

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 in the related art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, reference numeral 21 denotes a drying sorter interposed between a coarse substance removing device 2 and a magnetic sorter 9 in a pretreatment path F for treated ash. The matter 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 sieving device 23 is disposed in the casing 22 so as to be inclined from one end to the other end, and an ash supply port connected to the ash outlet of the bulky matter removing device 2 in the casing 22 above one end of the sieving device 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 sieve 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 is formed.
A drying air supply port 29 is formed to which a drying air introduction pipe 28 branched from is connected. Further, as shown in FIG. 3, a plurality of comb blade plates 23b each having a predetermined gap formed between the vibrating frames 23a are attached in a stepwise manner to the sieve 23, and an output shaft is provided at one end of the casing 22. A vibrating device 23c connected to the vibration frame 23a is connected. In this configuration, the exciter 23
By applying a predetermined vibration to the comb blade plate 23b with the c, the treated ash supplied from the ash supply port 24 is removed from the comb blade plate 23b.
From the treated ash outlet 27,
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 falls between the comb blade plates 23b and is dried. Thereby, the adhesion of the treated ash to the comb blade plate 23b can be prevented. Solids that do not fall from between the comb blades 23b slide down on the comb blades 23b and are discharged to the solid discharge port 26,
After being crushed by the crusher 4, the crusher 4 is again put into the dry sorter 21.

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

An adjusting exhaust pipe 34 is branched from the drying air introduction pipe 28, and the drying air introduction pipe 2
8, a first drying air adjustment valve 35 is interposed on the upstream side, a second drying air adjustment valve 36 is interposed on the downstream side, and a third drying air adjustment valve 37 is interposed on the adjustment exhaust pipe 34. Each of the drying air regulating valves 35 to 37 has a moisture content of 5 wt.
% By the control device 33.

According to the above configuration, the processing path of the present invention is provided with a solid matter removing function and a processing ash drying function that require a large volume for processing, and a function of a conventional vibrating sieve apparatus and a rotary kiln. Is provided, the space occupied by the pretreatment equipment can be greatly reduced, and the pretreatment path F can be simplified. Further, since the sorting function and the drying function are provided side by side as an integral type, it is possible to prevent the treated ash from adhering to the solid separation member such as the sieve 23. In this way, by integrating the sorting function and the drying function,
Troubles due to complication of the pretreatment step can be reduced.

Since the moisture content of the treated ash is detected by the moisture meter 32 and the amount of the drying air introduced into the drying and sorting machine 21 is controlled by the control device 33 based on the detected value, the treated ash is controlled. Can be continuously supplied to the ash melting furnace 1 stably in a suitable range in response to the variation of the supply amount of the 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 integrally provided with a solid removing function (corresponding to a conventional vibrating sieve) and a drying function (corresponding to a conventional rotary kiln). With the provision, the pretreatment process of the treated ash can be simplified and troubles can be reduced, and the installation space for the pretreatment equipment can be reduced and the device 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 moisture content may vary. However, it is possible to automatically cope with the problem, and it is possible to continuously and stably supply the treated ash having a uniform moisture content to the ash melting furnace.

[Brief description of the drawings]

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

FIG. 2 is a schematic longitudinal sectional view showing a drying and sorting machine provided in a treatment ash pretreatment path of the ash melting furnace equipment.

FIG. 3 is a plan view showing a sieve of the drying and sorting machine.

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

[Explanation of symbols]

 F Pretreatment path for treated ash G Exhaust gas treatment path 1 Ash melting furnace 1a Ash supply hopper 1b Melting burner 2 Bulk remover 4 Crusher 7 Air heater 9 Magnetic separator 18 Combustion air supply pipe 21 Dry separator 22 Casing 23 Sieve 23b comb blade plate 23c vibrator 24 ash supply port 25 drying air discharge port 26 solid matter discharge port 27 ash discharge port 28 drying air introduction pipe 29 drying air supply port 31 ash supply pipe 32 moisture meter 33 control Apparatus 34 Adjustment exhaust pipe 35 First drying air adjustment valve 36 Second drying air adjustment valve 37 Third drying air adjustment valve

Continuation of the front page (72) Inventor Tadashi Kono 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Hitachi Zosen Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) F23G 5/02 F23G 5/04

Claims (2)

(57) [Claims] 1. An apparatus for removing coarse solids from treated ash, a coarse substance removing apparatus for removing coarse solids from the treated ash, and a ash raw material from which coarse substances have been removed are provided in a treatment ash pretreatment path for supplying treated ash containing a large amount of water to an ash melting furnace. And a magnetic separator for removing metals from the dried treated ash, and a heat separator from the exhaust gas of the ash melting furnace. A pretreatment facility for an ash melting furnace, wherein a drying air introduction pipe is provided for introducing the collected high-temperature air into the drying sorter as drying air. 2. A moisture meter for detecting the moisture of the treated ash discharged from the drying and sorting machine is provided, and a drying air adjusting valve interposed in the drying air introduction pipe is operated based on a detection value of the moisture meter. 2. A pretreatment facility for an ash melting furnace according to claim 1, further comprising a control device for operating the ash melting furnace.