JP3291656B2 - Waste incineration ash reprocessing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste incineration ash reprocessing device, and more particularly to a method for removing harmful organic chlorine compounds contained in refuse incineration ash (hereinafter simply referred to as incineration ash) obtained by incinerating municipal waste or industrial waste. The present invention relates to an apparatus for reprocessing incinerated ash to be reduced.

[0002]

2. Description of the Related Art Organic chlorine compounds harmful to the human body, especially aromatic chlorine compounds, for example, highly toxic aromatic chlorine compounds such as PCDD _S (polychlorinated dibenzodioxin) and PCDF _S (polychlorinated dibenzofuran). Compounds are known to be produced as by-products of pesticides or secondary products from incineration of garbage and pollute the environment (KO).
lie et al, Chemosphere, 6 , 4
55 (1977); Wakimoto et
al, Environmental Health
Perspectives, 59 , 159 (198
5)).

[0003] The present inventor has proposed various techniques for reducing harmful organic chlorine compounds discharged from waste incineration facilities.

For example, Japanese Patent Application Laid-Open No. 1-155937 proposes a method for removing harmful organic chlorine compounds in exhaust gas generated from a refuse incinerator, and thereafter, the harmful organic chlorine compounds contained in the incinerated ash separated from the exhaust gas are removed from the human body. Japanese Patent Application No. 63-147 in view of the danger of adversely affecting plants and plants.
No. 193 proposed a technique for reducing harmful organic chlorine compounds contained in incinerated ash.

[0005]

SUMMARY OF THE INVENTION The aforementioned Japanese Patent Application No. 63-14 / 1988
According to the technology disclosed in No. 7193, harmful organic chlorine compounds contained in incineration ash can be effectively decomposed. However, there are various types of refuse incineration facilities, which are more efficient and can be used even in narrow spaces. It is assumed that a compact device is required.

It is an object of the present invention to provide a compact waste incineration ash reprocessing device capable of efficiently decomposing and removing harmful organic chlorine compounds, particularly aromatic organic chlorine compounds, contained in incineration ash.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
According to the present invention , a horizontally long apparatus main body is provided with an inlet for waste incineration ash and a discharge port for treated material at intervals in the axial direction, and the apparatus main body includes at least three rotating shafts. A shaft rotation shaft is supported, and the introduction portion of refuse incineration ash having at least a screw on the multi-axis rotation shaft, a stirring portion having a stirring blade, and a screw in the introduction portion for discharging in the opposite direction.
And a discharge portion having a screw provided, the starting end of the inlet portion to the ash inlet side of the apparatus main body, respectively arranged end of the stirring portion in the processing product discharge outlet side of the apparatus body, the apparatus main body and each of the rotating the shaft provided with a heating means for heating the waste incineration ash to 300 ° C. or higher Rutotomoni, horizontal of the treated product outlet
The level is higher than the horizontal level of the incineration ash inlet,
The apparatus is characterized in that the main body is inclined by 5 to 45 degrees .

[0008]

[0009]

An incineration ash inlet and a processed material outlet are provided at an axially spaced position in the apparatus main body which is long in the horizontal direction, and a multi-axis rotary shaft comprising at least three rotary shafts is supported in the apparatus main body. Then, an introduction section having a screw on the multi-axis rotating shaft, a stirring section having a stirring blade, and the screw of the introduction section are in the opposite direction.
And a discharge section having a screw for discharging the incineration ash, and further , by providing incineration ash heating means on the apparatus main body and each rotating shaft, the incineration ash introduced into the apparatus main body from the inlet of the incineration ash is driven. Provided on the multi-axis rotating shaft, is conveyed toward the agitating section of the downstream so as to fill the inside of the apparatus main body through the introduction section consisting of a screw, and is heated to 300 ° C. or more in the agitating section, and air and The harmful organic chlorine compounds contained in the incinerated ash are decomposed with high efficiency because the ash is stirred by the stirring blade in a state in which the contact with the ash is stopped. The incinerated ash from which the harmful organic chlorine compounds have been decomposed and removed is discharged from the downstream outlet as a treated product.

[0010] The multi-axis rotary shaft in the present invention is constituted by three or more rotary shafts.
In order to increase the efficiency when heated by heat transfer from
It is preferable that the space between the apparatus main body and the rotating shaft is as narrow as possible. Therefore, for example, when the apparatus main body has a cylindrical shape,
The number of rotation axes is preferably three, five or seven.
Further, the thickness of each rotating shaft constituting the multi-axis rotating shaft does not necessarily have to be the same, and for example, only the rotating shaft at the center may be made thicker or thinner. Further, the shape of the device main body may be an elliptical cylinder or other.

[0011] The heating means used in the present invention is a method in which incinerated ash is
Any material can be used as long as it can be heated to 0 ° C. or higher, preferably 400 ° C. or higher.

In the present invention, the inclination angle of the apparatus main body is 5
゜ to 45 ゜, and particularly preferably 10 ゜ to 20 ゜. By making the horizontal level of the discharge port higher than the horizontal level of the input port and tilting the main body of the apparatus by 5 ° to 45 °, the own weight of the incinerated ash introduced from the input port acts on the input screw of the multi-axis rotary shaft. As a result, the introduction screw conveys the incinerated ash so as to be constantly pushed up. Accordingly, the degree of filling of the incineration ash is increased, the treatment efficiency is improved, and the contact between the incineration ash and the air is cut off with a high probability, so that the decomposition of the harmful organic chlorine compounds in the incineration ash is promoted. If the inclination angle is less than 5 °, the filling effect of the incineration ash due to the inclination is not sufficiently exhibited. On the other hand, if it exceeds 45 °, the transport efficiency of the screw will be extremely reduced, the processing capacity will be reduced, and the load on the multi-shaft rotating shaft will be excessive due to clogging of incineration ash.

[0013]

Next, the present invention will be described in more detail with reference to examples.

FIG. 1 is an explanatory view of a refuse incineration ash reprocessing device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG.

This device comprises an apparatus main body 1 and the apparatus main body 1
, A multi-axis rotating shaft composed of seven rotating shafts 2a, 2b... 2g, a band heater 3 provided on the outer surface of the apparatus main body 1, and a rod-shaped heat transfer heater embedded inside the rotating shaft. 15 and the main body 1
Has a cylindrical shape that is long in the horizontal direction, and an inlet 4 for incinerated ash to be treated is provided at one upper end in the axial direction, and a discharge port 5 for treated material is provided at the lower end at the other end. The device body 1
The input port 4 is provided with a viewing window 6, and a detection port 7 for detecting an internal pressure, an internal temperature, and the like is provided between the input port 4 and the discharge port 5 at intervals. ing.

The multi-axis rotating shaft is roughly divided into an incineration ash introduction section A, a stirring section B, and a treated matter discharge section C. As shown in FIG. 2, the rotation axis 2a and the rotation axis 2a And the rotating shafts 2b to 2g arranged on the circumference.
A screw 11 for introducing incinerated ash is provided at an introduction portion A of each of the rotating shafts 2a to 2g, and a stirring blade 12 is provided at a stirring portion B at a uniform pitch on a spiral locus. Further, the discharge section C is provided with a discharge screw 13 which is opposite to the screw 11 of the introduction section A. The beginning of the introduction section A is disposed on the side of the incineration ash inlet 4 of the apparatus main body 1, and the end of the stirring section B is disposed on the side of the processed material discharge port 5. The rotating shafts 2a to 2g are supported by bearings 8 and 9 provided outside the apparatus main body 1, and are connected to a motor 10 via a gear 11. In addition, 14 is an energization facility.

The band heater 3 as a heating means is disposed on the outer peripheral surface from the end of the incineration ash inlet 4 of the apparatus main body 1 to the start of the processed material discharge port 5. Along with the rod-shaped heat transfer heater 15 embedded inside the rotary shaft, the incinerated ash
It has the ability to heat above 0 ° C.

In such a configuration, for example, the incinerated ash collected by a bag filter, an electric dust collector, etc.
Is introduced into the apparatus main body 1 by the screw 11 of the introduction part A of the multi-axis rotating shaft which rotates at a predetermined rotation speed.
The belt heater 3 and the rod-shaped heat transfer heater 15 inside the rotating shaft are conveyed toward the stirring section B while
, And is heated to, for example, 350 ° C. and stirred by the stirring blade, so that the harmful organic chlorine compounds contained in the incinerated ash are efficiently decomposed. The incinerated ash from which the organochlorine compounds have been decomposed and removed is discharged out of the system through a discharge port 5 of the downstream processed material. At this time, the processed material overrunning the discharge port 5 is pushed back by the discharge screw 13 provided on each rotating shaft and falls from the discharge port 5.

According to the present embodiment, since the stirring section B is filled with incineration ash and the heating and stirring treatment is carried out in a state where the incineration ash and oxygen are minimized, the harmful organic chlorine compounds in the incineration ash can be efficiently removed. Can be disassembled. In addition, by using a multi-shaft rotary shaft as the rotary shaft, the incineration ash transportation cross-sectional area increases, and the area of the heating section can be increased. Can be reduced to about 1 / 2.5.

In this embodiment, a speed controller (not shown) is provided for the motor 10 and when the amount of incinerated ash to be charged into the apparatus main body 1 and the processing capacity do not match, the load of the motor 10 is used as a parameter and the multi-axis rotating shaft is used. Can be controlled. Furthermore, instead of the band heater 3,
Alternatively, in parallel with this, for example, high pressure gas may be introduced into at least one of the rotating shafts 2a to 2g to heat the incinerated ash.

In the apparatus shown in FIG. 1, the filling level of the incineration ash can be further increased by setting the discharge level of the processed material higher than the input level of the incineration ash, for example, by inclining the apparatus body by 15 °. As a result, the organochlorine compounds in the incineration ash can be decomposed more efficiently. In addition, such a device with a high degree of filling can eliminate a supplementary facility such as a level switch, a rotary valve, and a motor for opening and closing the same, resulting in a more compact device.

Next, the present invention will be described in more detail with reference to specific examples. The incineration ash collected by the bag filter was processed at 350 k
g / h, fullness 98 vol%, processing temperature 350 ° C. and 450 ° C., and processing for 30 min.
All of the harmful organic chlorine compounds in the incineration ash could be converted into negligible small. Table 1 shows the results. In the table, nd indicates neglible small.

[0023]

[Table 1] Note) Processing amount: 350 kg / h Filling degree: 98 vol% Processing time: 30 min As can be seen from Table 1, processing amount 350 kg / h, filling degree 98 vol%, processing temperature 450 ° C., processing time 30 min.
, Almost all of the harmful organochlorine compounds in the incineration ash were thermally decomposed.

[0024]

According to the present invention , the incineration ash recovered from the refuse incineration facility is reduced to 300 ° C. by reducing contact with oxygen.
Since the heating and stirring treatment is performed as described above, the harmful organic chlorine compounds in the incineration ash can be decomposed with high efficiency. In addition, since the rotating shaft is multi-axial, the transport cross-sectional area of the incinerated ash becomes large and the heating area can be made large, so that the entire apparatus can be made compact. Further, the device body is
Inclined incineration ash inside the device body
Of harmful organic chlorine compounds is more improved.
Performance is improved.

[0025]

[Brief description of the drawings]

FIG. 1 is an explanatory view of a waste incineration ash reprocessing device showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially cutaway explanatory view of a rotating shaft.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Device main body, 2a-2g ... Rotating shaft, 3 ... Belt heater, 4 ... Input port, 5 ... Discharge port, 6 ... Viewing window, 7 ... Detection port, 8 ... Bearing, 9 ... Bearing, 10 ... Motor.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Otake 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Seigo Ando 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding (56) References JP-A-52-120575 (JP, A) JP-A-60-119999 (JP, U) JP-B-45-3525 (JP, B1) European Patent Application Publication 280364 (EP, A) 1) German Patent Application 3900268 (DE, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B09B 3/00 F23J 1/00 B01J 19/18-19/20 C10B 53/00 EPAT (QUESTEL)

Claims (1)

(57) [Claims] 1. An apparatus main body that is long in the horizontal direction is provided with an inlet for incineration ash and a discharge port for processed material at an axial interval, and includes at least three rotating shafts in the apparatus main body. The multi-rotation shaft is supported, and the introduction portion of the refuse incineration ash having at least a screw on the multi-axis rotation shaft, a stirring unit having a stirring blade, and a discharge in the opposite direction to the screw of the introduction unit
And a discharge section having a screw for use, a start end of the introduction section is disposed on an incineration ash input port side of the apparatus main body, and an end of the stirring section is disposed on a processed substance discharge port side of the apparatus main body, respectively. a rotating shaft provided with a heating means for heating the waste incineration ash to 300 ° C. or higher Rutotomoni, water in the treated product outlet
Flat level higher than the horizontal level of the incineration ash inlet
And a refuse incineration ash reprocessing device characterized in that the main body of the device is inclined by 5 to 45 degrees .