JP3485751B2 - Wind box for incinerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incinerator wind box, and more specifically, to an incineration object provided below a grate means and placed on the grate means from below. The present invention relates to a wind box for an incinerator having a wind box body for supplying air.

[0002]

2. Description of the Related Art Conventionally, as this kind of incinerator wind box,
It is known that the inner wall surface of the wind box body made of a highly rigid member such as metal is directly exposed to the air supplied from below.

[0003]

In the conventional incinerator wind box having the above-mentioned structure, the sewage and tar leached from the incineration object heated to a high temperature are treated by the grate means (the incinerator equipped with the stoker device). Then, a member called roostle made of cast iron etc. passes through the (corresponding to the grate means) and drips directly on the inner wall surface of the wind box body below it, and a part of it drops on the inner wall surface. The phenomenon of deposits was observed.

Thus, when the sewage or tar is dripped for a long period of time and accumulated on the inner wall surface of the wind box body, the shape of the inner surface of the wind box body is changed, so that the flow of air supplied to the incineration target is changed. Uneven combustion of the incinerated object occurs due to unevenness, the inner diameter of the wind box body is reduced, and a sufficient amount of air is not supplied to the incinerated object, and the tar accumulated on the inner wall surface of the air box body is ignited. There is a problem that a fire occurs in the wind box, and the acid gas generated from the tar at this time promotes corrosion of the grate means generally made of cast steel or the like and the wind box body.

Conventionally, the following measures have been taken or considered for the above problems. That is, the inner wall surface of the wind box main body is cleaned to remove the sewage and tar already accumulated therein at an appropriate frequency,
Adhesion of sewage or tar by allowing water to flow from the upper end of the inner wall surface of the wind box body so that a film of water is always formed on the inner wall surface while the incinerator is operating, By spraying water toward the space inside the wind box to prevent accumulation and prevent fire, the particles of this water collide with liquid sewage and tar dripping into the wind box. The sewage and tar are cooled and solidified in the air, and are dropped onto a water-sealed conveyor provided below the wind box without adhering to the inner wall surface.

However, the cleaning of the inner wall surface cannot be performed very frequently in order to keep the predetermined operation pace of the incinerator, and when the deposit strength on the inner wall surface is high or the deposit amount is high. If it becomes abnormally large, it will be difficult to remove it by cleaning, so it cannot be said that it is an appropriate measure.
In the method of forming a water film on the inner wall surface, since the amount of water flowing is relatively large, it is necessary to strengthen the wastewater treatment capacity required to keep the water level on the water-sealed conveyor constant. There is a disadvantage that it will be a heavy burden, and the method of spraying water into the space inside the wind box may lead to a steam explosion due to the radiant heat from the upper part of the grate and it is a practical measure. No, the measures to overcome these problems were awaited.

The object of the present invention is, in view of the above-mentioned drawbacks observed in the conventional incinerator wind box illustrated above, that the sewage and tar dripping from above are less likely to be deposited on the inner wall surface of the wind box body. An object of the present invention is to provide a wind box for an incinerator, which does not require facility enhancement such as enhancement of wastewater treatment capacity and does not cause concern about steam explosion.

[0008]

In order to achieve the above object, in the incinerator wind box according to claim 1 of the present invention, the inner wall surface of the wind box main body is made of noncombustible fiber and is replaceable. It is characterized by being covered with a covering member.

[Advantages of the Invention] Due to the above-mentioned characteristic configuration,
In the incinerator wind box according to the invention of claim 1, the sewage and tar dripping from above fall onto the replaceable covering member that covers the inner wall surface of the wind box body, , Even if the components of sewage and tar are deposited on the covering member,
It is only necessary to replace the coating member with a new one or a predetermined one that has undergone a predetermined regeneration treatment and to which there is little adherence. Also, when a fire occurs on the deposit on the coating member, the coating member that is causing the fire is also replaced. The fire can be stopped by removing it from the wind box body. Therefore, as a result, an incinerator air box is provided in which the sewage and tar dripping from above do not easily accumulate on the inner wall surface of the air box body, and the inner wall surface does not need to be frequently cleaned, and Since it does not form a film, there is no need to install special wastewater treatment equipment to keep the water level on the water-sealed conveyor constant, and there is no risk of causing a steam explosion. .

Further, as in the invention described in claim 2, the covering member may be held to the inner wall surface by a joining means that loses the joining effect under a predetermined temperature condition. With such a configuration, when a fire occurs on the deposits on the covering member, the joining means loses the joining effect under the high temperature condition due to the fire, so that the covering member automatically lowers the water below it by its own weight. It is convenient because it can easily be extinguished in a short time by dropping it into the water that has accumulated on the sealed conveyor.

Further, as in the invention described in claim 3,
A temperature fuse is used as the coupling means of the invention described in claim 2, and a detection mechanism for electrically detecting disconnection of the temperature fuse is provided in order to detect movement of the covering member from a predetermined position on the inner wall surface. May be. If implemented in this manner, it is possible to determine whether or not the covering member is held at a predetermined position on the inner wall surface by detecting whether or not the coupling means has been cut. Moreover, this determination can be performed by operating the incinerator. However, it is convenient that the operation can be performed from the outside of the wind box or the furnace, and also from a position separated from the incinerator. Depending on the determination result, the operation of the incinerator may be stopped, the fallen covering member may be collected, and a new covering member may be attached.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Outline of incinerator) FIG. 1 schematically shows an incinerator for municipal waste as an example of the incinerator. In this incinerator,
The dust thrown into the hopper 2 is extruded and fed into the furnace 4 by the pusher 3 provided in the lower part of the hopper 2. In the furnace, there is a stoker device 1 (an example of a grate means) for incineration treatment. The stoker device 1 dries the supplied dust and heats it to a temperature in the vicinity of the ignition point, and burns the dry dust. 1 and 2nd combustion zones 9 and 9 ', and post-combustion zone 1 for ashing dust burned in the 1st and 2nd combustion zones 9 and 9'
It consists of four 0 incineration zones. These four incineration treatment zones are arranged so as to have a stepwise shape that gradually decreases toward the inside of the furnace, but the individual incineration treatment zones are formed substantially horizontally. Below the incineration zones 8, 9, 9 ', 10 are provided wind boxes 5a, 5b, 5c, 5d,
From the normal temperature to the high temperature, the primary combustion air 6 is supplied from the lower side toward the incineration target placed on each incineration zone through these air boxes. Therefore, the individual grates 11, 11 ,. ． Is made of a porous metal so as to allow the flow of the primary combustion air 6.

The lower end of each wind box is as shown in FIG.
It is submerged in the water stored on the water-sealed conveyor 12 so that the negative pressure state inside the furnace 4 is maintained. Afterburn zone 1
The ash generated around 0 drops from the gap between the grate 11 and 11 and the terminal part of the stoker device 1, passes through the wind box, and further precipitates the water on the water-sealed conveyor 12,
It is discharged to the ash pit 13 by the water seal conveyor 12.
The grate 11 is composed of a fixed grate 11A and a movable grate 11B which are alternately arranged. Each movable grate 11
B, while maintaining the sliding contact state with the fixed grate 11A,
The movable grate 11B is reciprocally driven in the front-rear direction with respect to the fixed grate 11A, and the object to be incinerated on the stoker device 1 is conveyed toward the inner side of the furnace by the movement of the movable grate 11B.

(Structure of Dry Box Wind Box) As shown in FIGS. 2 and 3, the wind box 5a of the dry band 8 is composed of a steel upper wind box body 20 and a lower end of the upper wind box body 20. It has a connected lower wind box body 22. The upper wind box body 20 has a generally inverted truncated pyramid shape having a rectangular upper end in a plan view, in other words, a hopper shape (the inclined wall surface forming the hopper has a steep slope of 60 ° or more with respect to the horizontal direction). The lower wind box body 22 is a tubular member having a rectangular cross section in a plan view. The four inner wall surfaces forming the upper air box body 20 are each covered with a glass cloth 30 (an example of a covering member made of noncombustible fiber). In this embodiment, four glass cloths 30 each having a trapezoidal shape cover all four inner wall surfaces of the upper wind box body 20.
A metallic conductive thermal fuse 32 is fixed to the upper end of the glass cloth 30, and the glass cloth 30 is formed on the upper end of the inner wall surface of the upper wind box body 20 via the thermal fuse 32. It is locked to the horizontal rod-shaped locked member 20a. As shown in FIG. 4, the thermal fuse 32 includes an upper hook 36 made of steel, a lower fitting portion 38, and a thermal fuse body 34 connecting the both. A through hole is formed in the lower fitting portion 38, and the through hole and the rivet 40 can be used to fix the lower fitting portion 38 to the upper end of the glass cloth 30. Further, since the upper hook 36 has a hook shape, the glass cloth 30 can be replaceably locked to the locked member 20a of the upper wind box body 20. With these configurations, the sewage and tar falling toward the hopper-shaped wall of the wind box 5a are
It reaches the glass cloth 30 without directly touching the steel upper wind box body 20.

When the tar accumulated on the glass cloth 30 is ignited and a fire occurs, the heat fuse body 34 is melted and cut by the heat of the fire, and the glass cloth 30 is automatically weighed by the upper wind box body 20. It is configured to be extinguished by being dropped from the water, landing in water on the water-sealed conveyor 12 and extinguished. Therefore, as the individual glass cloth 30,
A thin lower air box body 2 that is thin and bends easily when necessary.
It is desirable to be able to pass 2 without resistance. As the thermal fuse body 34, one that is melted and blown at about 300 ° C. (an example of a predetermined temperature condition) is selected. Further, the incinerator wind box according to the present invention is provided with the verification circuit 50 for determining the drop of the glass cloth 30 following the melting of the temperature fuse main body 34 or the displacement with respect to the upper wind box main body 20 from a remote location. Has been. The verification circuit 50 includes a conducting wire 52, a thermal fuse 32, a voltage generating means 54 such as a battery.
And alarm means 56 for visually or audibly indicating that the current in the circuit has been interrupted. The conducting wire 52 is fixed to the upper hook 36 of the thermal fuse body 34 at one end, while the other end of the conducting wire 52 is the other end of the conducting wire 52 when the thermal fuse body 34 is cut and the glass cloth 30 falls. Is inserted and locked in a sleeve (not shown) provided in the lower fitting portion 38 so as to come out of the sleeve. Although only one set of the verification circuits 50 is shown in FIG. 3 for the sake of clarity, the four glass cloths 30, 30 ,. ． , And all the thermal fuses 32, 32 ,. ． It is convenient to provide the same for each glass cloth 30 so that the state of each glass cloth 30 can be determined separately.

[Other Embodiments] <1> Instead of the metallic and conductive thermal fuse 32,
The glass cloth 30 may be locked with a resin piece that melts under a predetermined temperature condition and loses the bonding force.

<2> In the above embodiment, the incinerator air box equipped with the glass cloth 30 according to the present invention is generally installed only for the dry zone 8 where the amount of sewage and tar fall is the largest. However, the wind box for the incinerator having the glass cloth 30 may be applied to the wind boxes for other parts of the stoker device 1 such as the combustion zone 9.

[Brief description of drawings]

FIG. 1 is a schematic side view of an incinerator having an incinerator air box according to the present invention.

FIG. 2 is a schematic perspective view of an incinerator wind box according to the present invention.

FIG. 3 is a schematic view of an incinerator wind box according to the present invention.

FIG. 4 is a schematic view of a thermal fuse used in the incinerator air box of FIG.

[Explanation of symbols]

5 wind box 20 Upper wind box body 22 Lower wind box body 30 glass cloth 32 Thermal fuse 50 test circuit

Claims (3)

(57) [Claims] 1. A wind box for an incinerator, comprising a wind box main body which is provided below a grate means and supplies air from below to an incineration object placed on the grate means, wherein: An incinerator air box in which the inner wall surface of the air box body is covered with a replaceable covering member made of non-combustible fiber. 2. The wind box for an incinerator according to claim 1, wherein the covering member is held against the inner wall surface by a joining means that loses a joining effect under a predetermined temperature condition. 3. A temperature fuse is used as the coupling means, and a detection mechanism is provided for electrically detecting disconnection of the temperature fuse in order to detect movement of the covering member from a predetermined position on the inner wall surface. The air box for an incinerator according to claim 2, which is provided.