JPS6033417A - Disposal device for incineration slag - Google Patents

Abstract

PURPOSE:To make available to control a combustion and a melting quantity, while simultaneously preventing an incinerator from a blocking trouble which would otherwise be caused by bridging, by providing a moving layer transferring means adapted to vary the moving speed of incineration slag's moving layer. CONSTITUTION:An incineration slag N containing unburned carbons is stacked upon a grate 15 inside a melting furnace 11, and such slag stacked falls downwardly toward the inclining direction as a moving layer 10, while being pushed by means of moving layer pushing member 32 of moving layer transferring means 31. The proximal end of pushing member 32 is connected via a pin joint with the piston rod 35 of piston mechanism 33, so that the pushing member 32 may be moved to and out of the furnace 11. The piston mechanism 33 is constructed such that its operable distance., i.e., the stroke, operating interval and operating speed of piston rod 35 may be varied arbitrarily, and thereby controlling the moving quantity of moving layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incineration residue processing device for melting incineration residue discharged from an incinerator, and particularly enables control of the supply of incineration residue and the amount of combustion and melting. The present invention relates to an incineration residue processing device that can prevent clogging of the furnace and perform stable operation.

Generally, municipal waste, industrial waste, etc. are incinerated, but
The resulting incineration residue is normally disposed of in a landfill.

Incidentally, this landfill disposal poses a larger social problem than the issue of securing a landfill site and countermeasures for inundation activation.

Therefore, recently, a method for melting incineration residue has been developed which solves these problems all at once and makes it non-polluting.

This treatment method will be explained based on Fig. 1. 1 is an incinerator such as a stoker type furnace or a rotary kiln type furnace, in which waste M such as municipal garbage is incinerated with combustion air 2. . The discharged incineration residue N is introduced into the melting furnace 4 of the incineration residue treatment device 3, and the unburned carbon remaining therein is combusted by the combustion air 5 supplied at the entrance of the melting furnace, and the combustion heat is used to burn it. Heat and melt the incineration ash. The molten slag 6 flows diagonally downward through the hearth 7 and forms a predetermined-shaped lump from the discharge end 8 and falls one after another into the slag cooling water tank 9 located below, where it is cooled and solidified into lump-like solids. will be generated.

By the way, in order to improve the combustion efficiency, it is necessary to appropriately control the combustion and melting amount, but in this type of conventional example, the weight of the residue or molten slag causes these to form a sloped hearth. Because it is structured so that 7 flows down,
Not only is it difficult to properly control combustion and melting, but the molten slag solidifies on the furnace walls, etc. In some cases, crosslinks were formed and occlusion problems occurred.

Furnaces equipped with an ash pushing mechanism are also known, but this operation is only intended to discharge ash and does not control the amount of combustion and melting. Furthermore, in the conventional example, since the combustion air 5 is supplied at the melting point 4 [1] to burn the unburned carbon, a sufficient amount of heat is supplied to the molten slag 6 flowing through the hearth 7. First, there was a problem of promoting the formation of the above-mentioned crosslinks.

For this reason, attempts have been made to increase the combustion temperature and prevent the solidification of molten slag by supplying oxygen instead of air, but in this case, the power consumption of the oxygen generator is large, and the handling It wasn't easy either.

On the other hand, in addition to the above embodiments, the surface of the combustion residue may be directly irradiated with a flame from an oil burner to melt it, or an electrode may be inserted into the combustion residue or molten slag to melt it using Joule heat. However, in the method using an oil burner, heat loss due to radiant heat is large because the molten high-temperature part on the surface is exposed, and furthermore, because the thermal conductivity of molten slag is poor, oil inevitably Consumption increased and running costs increased.Furthermore, the method using Joule heat cannot use unburned carbon in the residue as fuel, resulting in increased power consumption and is not suitable for practical use.

The present invention has been devised to effectively solve the problems described above, particularly in view of the difficulty in controlling the amount of combustion and melting.

An object of the present invention is to form a moving layer transfer means in a melting furnace for changing the moving speed of the incineration residue moving layer transferred into the melting furnace, and to change the transfer purpose by changing the operating interval, operating speed, etc. It is an object of the present invention to provide a sintered residue processing apparatus which allows combustion and melting amount to be controlled and prevents clogging of the furnace due to crosslinking.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 2 is a longitudinal sectional view showing a first embodiment of the present invention, and FIG. 3 is an enlarged perspective view of the Δ section in FIG.

As shown in the figure, the incineration 2Jl residue processing apparatus has a melting furnace 11 for forming a moving layer 10 of incineration residue N. The melting furnace 11 has a substantially cylindrical casing 12 whose outer shell is made of refractory bricks, etc., and one end of the upper part has an upwardly extending casing 12 connected to the residue discharge port of the incinerator 1. An open hopper, that is, an incineration residue inlet 13 is formed (see FIG. 1). The casing 12 is inclined downward at an appropriate angle along the direction of transport of the incineration residue or molten slag to be transported into the casing 12, thereby facilitating the transport of the moving bed 10 as will be described later.

A grate plate 15 is attached to the bottom of the casing 12 at a predetermined distance above the casing bottom wall 14 and is provided along the inclination direction of the furnace, thereby forming a hearth 16. This fire bed board 15 is formed into a flat plate shape using heat-resistant Relamix, for example.
Improves the flow of molten slag, etc.

A heating means 17 is provided at the lower part of the grate plate 15 for heating the moving bed 10 flowing down the upper side thereof, and a heating means 17 is provided on the casing side wall or the furnace side wall 18 to air the combustion air in the moving bed. A combustion air supply means 19 is provided for supplying combustion air.

The heating means 17 is located at the lower part of the grate plate 15 in the width direction, and includes a large number of heating elements 20 arranged at predetermined intervals along the longitudinal direction of the grate plate, and each heating element 20 The heating element protection case 21 has a semicircular cross section and covers the heat generating element 20 at a predetermined interval.
Since a high temperature output is required, it is made of silicon carbide molded into a rod shape, and by passing current through it through the wiring 22, it can generate a high temperature that cannot be obtained with a metal heating element (such as a chrome wire). This will heat the moving layer 10 on the grate plate. The above-mentioned wiring 22 is connected to a temperature controller (not shown) to control the temperature, but it is preferable to use multiple wirings to control the temperature of each heating element in accordance with the part where each heating element is located. Even so, J.

In order to prevent the heating element 20 inside the case from deteriorating, it is preferable to make the inside of the case a closed space and fill it with an inert gas such as nitrogen.

Further, the combustion air supply means 19 is arranged so as to face the furnace side wall at an angle of τ. In one direction? /) Combustion air inlets 22 are drilled at predetermined intervals, and an on-off valve 2 is installed in the middle.
3 is interposed and a combustion air supply pipe 24 is connected to each of these blowing ports, and high-temperature heated air is blown into the moving bed from the side so as to cross the hearth 16. There is. Incidentally, the opening of the closing valve 23 is individually controlled by a combustion air controller (not shown).
It is possible to supply the required amount of air into the moving bed.

Further, a slag discharge port 25 for discharging the slab melted in the furnace is formed at the lower end of the casing 12 in the inclined direction, and a molten slag discharge passage 26 extending in the vertical direction is formed in the discharge port 25. The molten slag 27 that is connected and falls in the form of a predetermined lump is cooled and solidified in the slag cooling water tank 9 (see Fig. 1). A flue 28 is provided in the middle of the exhaust passage 26 and is branched from the flue 28 and inclined slightly upward, and the flue 28 is directed toward the blower 2.
9, the exhaust gas is cooled by an exhaust gas cooler 30, and then released into the atmosphere.

The melting furnace 11 thus constructed is provided with a moving bed transfer means 31, which is one of the features of the present invention. This transfer means 31 is for controlling the amount of transfer by changing the moving speed of the moving layer 10, and the moving layer pushing member 3
2, and a piston mechanism 33 for making it appear and disappear into the furnace.
It is composed of:

The moving layer extrusion member 32 is formed by molding heat-resistant ceramics or the like into a rectangular shape so that its length and width are approximately the same as the length and width of the hearth 16,
The side wall in the inclination direction of the casing 12 is passed through the casing 12 so that it can freely slide in the inclination direction along the hearth, and the residue can be forcibly transferred by the tip residue abutting surface 34. It looks like this.

The 1st end of the extrusion 1st part G432 is connected to the piston [JRAD 35] of the above-mentioned screw t-n mechanism 33 by a bin joint, so that the extrusion part 432 can be moved in and out of the furnace. There is. This piston mechanism 33 is controlled by a control means (not shown) to control the piston rod 35 at each working distance.
0 Stroke, operation interval, and operation speed can be changed arbitrarily!
7, it is configured to move the moving layer! It is designed to control Ij+m.

In the above embodiment, the hearth 16 is integrally molded from a single piece of ceramic, and the combustion air is supplied from the side wall of the furnace.
However, the present invention is not limited to this. For example, as shown in FIG. A hearth may be formed adjacent to the hearth.A wind box 37 formed at the bottom of the hearth allows combustion air to flow through the wind box 37.
and -9= The fuel may be supplied from the lower part of the moving layer 10 through a slit 38 formed in the overlapped portion of the grate plate 36.

The operation of the present invention configured as above will be described.

First, as shown in Figures 1 and 2, industrial waste M such as municipal waste is fed into the incinerator 1 from the input port, and after being burned normally therein, the generated incineration residue is transferred to the incinerator. 1 into the incineration residue introduction [] 13 of the melting furnace 11 connected to the end of the melting furnace 11. During combustion in the incinerator, combustion is controlled so that unburned carbon in the residue remains in the range of 1 to 25%, preferably 10 to 20%.

Specifically, combustion control is performed by adjusting the input amount of waste, the amount of combustion air, the stoker feed rate in the case of a stoker type, and the rotation speed in a rotary kiln type.

As shown in FIGS. 2 and 3, the incineration residue N containing unburned carbon is stacked on the grate plate 15 in the melting furnace 11, and this stacked residue is transferred to the moving bed 10 of the moving bed transfer means 31. It becomes the moving layer 10 while being pushed by the pushing member 32 and flows down in the inclined direction.

On the other hand, the combustion air transferred within the combustion air supply pipe 19 is supplied into the moving bed from the combustion air blowing port 22,
This causes the unburned carbon to burn, and the heat generated at this time melts the incineration ash. In this way, since air is supplied directly into the moving bed from the sides of the moving bed, it is possible to burn the residue from within, and there is also little heat radiation, which is effective for melting by retaining the combustion heat within the bed. can contribute to

This molten slag flows on the grate plate 15 heated to a high temperature by the heating element 20 of the heating means 17, that is, above the melting point of the molten slag, or is pushed away by the moving bed extrusion member 32 and is discharged from the lower end slag discharge port 25 to a predetermined amount. The molten slag becomes a large molten slag and falls through the molten slag discharge passage 26, and is cooled and solidified in the slag cooling water tank 9.

Then, when the molten slag flows out, the gas is sucked in by the blower 29 and is discharged from the flue 28 while preventing the outlet 39 of the grate plate from being cooled. . In this way, the extrusion member 32 normally moves back and forth continuously in the furnace at a constant speed, or moves for a large distance without moving the extrusion member 32 to the end of the stroke, and then returns at a constant speed. It is burned and melted in small quantities.

Here, if it becomes necessary to increase the amount of combustion or molten layer remaining in the furnace due to load fluctuations, for example, the operability -1, operation interval, or operation speed of the piston mechanism 33 is increased. As a result, the piston rod 35 extends to the stroke end, and the operating distance of the pushing member 32 connected thereto is increased, the operating interval of the pushing member 32 is shortened, or the reciprocating operating speed is increased. The amount of combustion melting can be increased by these combined operations.

Further, in order to reduce the amount of combustion melt, the operation described above is reversed.

In this way, by sliding the extrusion member 32 into the furnace, it is not only possible to control the combustion melt 111m as described in 1, but also to remove the solidified slag that has adhered to the hearth 16 and the furnace side I¥18. It is possible to prevent the occurrence of crosslinking, etc. Furthermore, it is possible to forcibly discharge so-called unsuitable materials for melting that remain in the hearth 16 without being melted, thereby enabling stable operation.

In addition, even after the unburned carbon is burned out, the molten slag remains molten due to the constant supply of heat from the grate plate 15 heated above its melting point, so it adheres to the hearth 16 and the furnace walls. Solidification can be suppressed.

Furthermore, by installing the heating element 20, it is possible to heat the incinerated residue with heat other than combustion heat, so this combustion is promoted, and during low negative operation or when there is little unburned carbon in the residue. This can be accommodated even if

Next, a second embodiment will be described based on FIG.

Components that are the same as those in the first embodiment are given the same reference numerals and explanations will be omitted.

-13= This second embodiment employs a so-called moving bed type stoker 41 as the moving bed transfer means 40.

This stoker 41 is constructed by passing a chain roller 43 between a pair of sprockets 42 and 42 that are rotatably provided at the upper and lower ends of the bottom of the casing 12 in the inclined direction. It is constructed by continuously connecting grate plates 44 made of

The remaining moving layer 10 is stagnantly moved by the movement of the grate plate 44 and is sequentially transferred downward in the inclination direction inside the furnace.

Therefore, in order to control the amount of combustion and melting, the moving speed of the moving layer 10 is changed by reducing the operating speed or changing the operating interval of the stoker 41 as the moving layer transfer means 40, and thereby the transfer amount of the moving layer 1110 is controlled. Let's do it.

Incidentally, in the above embodiments, the moving layer transfer means has been described as an extrusion type or a moving bed type, but the present invention is not limited thereto, and may be, for example, a conveyor 14 type.

In addition, although the heating element 20 is installed at the lower part of the hearth, etc., and the moving bed is heated from the lower part, the present invention is not limited thereto. Alternatively, the heating element may be inserted into a protective case and installed in the furnace.

In short, according to the present invention, the following excellent effects can be achieved.

(1) By changing the operating interval, operating distance, and operating speed of the first stage of moving bed transfer, it is possible to control the amount of moving bed transfer and thereby control the combustion and melting period of the remaining residue.

(2) By forcibly transferring the residue, the contact between the residue and the combustion air becomes good, and together with the burying described in the above device section, the combustion efficiency can be improved.

(3) Molten slag solidified by FSL 6 on the hearth and furnace walls can be removed and crosslinking of the slag can be prevented.

(4) It is possible to forcibly discharge so-called unmelted substances that do not melt, and in combination with the reason described in the above 3, it is possible to prevent clogging in the furnace and perform stable operation.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional incineration residue processing device connected to an incinerator, FIG. 2 is a vertical cross-sectional view not showing the first embodiment of the present invention, and FIG. Figure 4 is an enlarged perspective view of the
FIG. 5 is a vertical sectional view showing a modification of the embodiment, and FIG.
FIG. 3 is a longitudinal cross-sectional view showing an example. In the figure, 1 is an incinerator, 10 is a moving bed, 11 is a melting furnace, and 3 is an incinerator.
1.40 is a moving layer transfer means, 32 is a moving layer pushing member, 33 is a piston mechanism, and N is an incineration residue. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinutani Continued from page 1 [Co., Ltd.] Inventor Takehiko Mokugi Tokyo Department Company Yutaka [Co., Ltd.] Inventor Benjo Single Core Tokyo Department Company 3-2-16 Toyosu, Toyoe Higashi-ku Ishikawajima Harima Heavy Industries Stock %
Formula % 3-2-16 Toyosu, Koto-ku, Ishikawajima Harima Heavy Industries Co., Ltd. General Office

Claims (1)

[Claims] In an incineration residue treatment device that burns unburned carbon contained in incineration residue discharged from an incinerator to obtain molten slag, a moving layer of incineration residue is formed in order to melt and process the incineration residue discharged. An incineration residue treatment characterized by comprising: a melting furnace in which the moving layer is moved; and a moving layer transfer means provided in the melting furnace for changing the speed of movement of the moving layer in order to control the amount of transfer of the moving layer. Device.