JP4019494B2 - Fluidized bed incinerator dust feeder. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust supply device for supplying waste such as municipal waste into a fluidized bed incinerator.
[0002]
[Prior art]
As shown schematically in FIG. 2, a fluidized bed incinerator 1 for incinerating waste such as municipal waste is provided with a fluidized medium in a lower part in a furnace body 1a provided with a chute 2 for introducing waste into the upper part. A fluidized bed 3 filled with sand 4 is provided, and a plurality of diffuser tubes 5 are arranged horizontally in the fluidized bed 3, and fluidized air is introduced into the fluidized bed 3 through the diffuser tubes 5. In general, the fluidized bed 3 is fluidized, and the waste is incinerated in the fluidized bed 3. Further, as a dust feeder 7 for supplying the waste 6 through the chute 2 into the fluidized bed incinerator 1, the combustion in the fluidized bed incinerator 1 is continuously performed while maintaining the sealing performance. Since it is necessary to supply the waste 6, a so-called screw-type dust feeder is generally employed in which the waste 6 is conveyed by rotating the screw 7 b in the casing 7 a, not shown. The waste 6 sent into the charging hopper 8 by the conveying means is fed through the chute 2 into the fluidized bed incinerator 1 while being fed by the screw type feeder 7. 9 is an exhaust gas outlet provided at the top, 10 is an incombustible material discharge machine provided at the bottom, 11 is returned to the fluidized bed incinerator 1 with the fluidized sand 4 that has fallen and discharged together with the incombustible material and separated from the incombustible material. It is a sand circulation conveyor.
[0003]
In the fluidized bed incinerator 1, the waste thrown into the furnace burns rapidly and in a short time. Therefore, in order to stabilize the combustion, the waste 6 is continuously and quantitatively charged into the furnace. It is important to let
[0004]
[Problems to be solved by the invention]
However, the waste 6 such as municipal waste is packed and discarded in bags of various sizes, and the waste 6 such as municipal waste that is thrown into the fluidized bed incinerator 1 by the feeder 7 is Since it remains a bag, the individual shapes are large, and there are compressibility and re-expansion properties, and the fact is that the garbage is entangled with each other. Therefore, when the waste 6 such as municipal waste is continuously supplied by the conventional screw-type dust feeder 7, it seems that the quantitativeness is ensured in a long time, but it is seen in a short time. In addition, the amount of supply varies depending on the size of the individual waste, and the pulsation of the amount of supply is unavoidable. Sometimes, the supply of waste into the fluidized bed incinerator 1 is temporarily interrupted, A so-called "fallen" fall occurs.
[0005]
Under such conditions, the operating conditions exceed the controllable range on the furnace side, so that although the fluidized bed incinerator 1 is originally highly combustible, an instantaneous temperature drop or incomplete combustion occurs. As a result, stable combustion of the furnace is hindered, resulting in the generation of dioxins.
[0006]
In particular, in a small furnace, since the size of the supplied garbage is the same as the size of the garbage supplied to the large furnace, the screw type feeder 7 itself cannot reduce the size of the screw in accordance with the supply amount. Because almost the same scale as that used in large furnaces is used, large screws have to be used at low speed, and continuous supply of waste becomes increasingly impossible. There is a problem that the risk of inhibiting the stable flammability of the furnace and causing dioxin generation becomes more prominent.
[0007]
Therefore, the present invention enables continuous and quantitative supply of waste such as municipal waste into a furnace regardless of whether it is a large furnace or a small furnace, thereby improving the stability of combustion. It is intended to ensure that dioxin generation can be suppressed.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention supplies waste into the furnace through the chute inlet side provided on the furnace wall for supplying waste to the fluidized bed incinerator and the chute. Between the outlet side of the screw-type dust feeder, an inlet chamber attached to the outlet side of the screw-type feeder, an outlet chamber attached to the inlet side of the chute, one end to the inlet chamber and the other end A drum-type transporter composed of a rotary drum that is rotatably connected to each of the outlet chambers by a rotary joint having a sealant interposed therebetween is interposed, and waste supplied from the screw-type dust feeder is transferred into the drum. are the, and so the configuration is continuously falling waste from the outlet chamber of the drum-type conveyor which is adapted to convey while staying the waste in the rotary drum to the inlet side of the chute.
[0009]
Since the waste sent intermittently from the screw type feeder is transported while being retained in the rotating drum of the drum type transporter, it is averaged. Thereby, the supply of waste from the chute into the fluidized bed incinerator is performed continuously and quantitatively, and the stability of combustion in the furnace is obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 shows an embodiment of the present invention. Like the fluidized bed incinerator 1 shown in FIG. 2, a chute 2 for introducing waste is provided on the side wall of the furnace body 1a, and the furnace A fluidized bed 3 filled with sand 4 is provided in the inner and lower part, a diffuser pipe 5 is provided in the fluidized bed 3, and the fluidized bed 3 is fluidized by the air blown from the diffuser pipe 5 into the furnace. In a configuration in which wastes 6 such as municipal waste sent by the screw feeder 7 are dropped from the chute 2 into the furnace and supplied in the horizontal direction. An outlet chamber 13 provided with a circular inlet 14 and an outlet 15 at the lower end so that the outlet 15 can be joined to the upper end of the chute 2 with a flange 16; and an end portion on the outlet side of the casing 7a of the screw type dust feeder 7. Fitted and fixed to the outer periphery of the outlet A cylindrical inlet chamber 17 provided with an outlet 18 having the same diameter as the inlet 14 of the thirteen, and one end rotatably connected to the inlet 14 of the outlet chamber 13 and the other end of the outlet 18 of the inlet chamber 17. A drum-type transporter 12 comprising a rotary drum 19 that is rotatably connected to the screw-type transporter 12, the drum-type transporter 12 being interposed between the screw-type dust feeder 7 and the chute 2, and a screw Waste 6 such as municipal waste discharged from the type dust feeder 7 is transferred into the rotary drum 19 of the drum type transporter 12, and the waste 6 is moved to the outlet side while rotating the rotary drum 19 with external power. And is dropped into the chute 2 from the outlet chamber 13.
[0012]
For this purpose, the drum-type transport machine 12 is arranged so that the rotary drum 19 is inclined by about 3 degrees so that the outlet side is lower than the inlet side, and a sealing material is interposed at the outlet 18 of the inlet chamber 17 on the inlet side. The rotary joint 20 is connected and the outlet side is connected to the inlet 14 of the outlet chamber 13 by a rotary joint 20 having a sealing material interposed therebetween. Is attached, and a pinion or roller 23 attached to the output shaft of the motor 22 is engaged or brought into contact with the motor 22 so that the rotary drum 19 is rotated at a low speed by the motor 22.
[0013]
Further, a seal damper 24 that is normally urged in the closing direction and is opened downward by a drop load of the waste 6 is installed at a position in the middle of the chute 2.
[0014]
When waste 6 such as municipal waste is put in the bag hopper 8 of the screw-type dust feeder 7 in different sizes, the waste is put into the casing 7a from the hopper 8 by the rotation of the screw 7b. 6 is pushed and conveyed to the exit side.
[0015]
Since the waste 6 supplied by the screw type dust feeder 7 is pushed and conveyed in the casing, there is continuity. However, as described above, the waste 6 is compressed in various sizes and entangled. For this reason, the waste 6 intermittently exits the screw type feeder 7 and the supply amount pulsates. In the present invention, the drum type conveyor 12 is disposed at the outlet side of the screw type feeder 7. Therefore, the pulsation of the supply amount by the screw type dust feeder 7 can be averaged without the pulsation of the supply amount in the drum type transporter 12. That is, the drum-type transport machine 12 including the inlet chamber 17, the outlet chamber 13, and the rotating drum 19 between them gradually disposes the waste toward the outlet side while rotating the rotating drum 19 so that the outlet side is slightly lowered. 6, the waste 6 transferred from the inlet chamber 17 of the drum type transporter 12 into the rotary drum 19 is released from compression and moved in the circumferential direction by the rotation of the rotary drum 19. By gradually feeding to the outlet side while being stirred, the pulsation of the supply amount by the screw type feeder 7 is averaged, and the waste 6 transferred from the rotary drum 19 to the outlet chamber 13 is continuously produced. Will be dropped to the chute 2 almost every time.
[0016]
In the above, if the rotary drum 19 of the drum type transporter 12 has a sufficient length to absorb the pulsation of the amount of waste 6 supplied intermittently from the screw type feeder 7. Well, from the viewpoint of waste residence time, it is only necessary to secure a residence time of about 5 minutes.
[0017]
The present invention is not limited to the above-described embodiment. For example, in the case of garbage supply for a large furnace, a plurality of divided drums are arranged in parallel inside the drum 19 of the drum-type transporter 12. Then, the waste may be conveyed by being divided into each drum.
[0018]
【The invention's effect】
As described above, according to the feeder of the fluidized bed incinerator of the present invention, the chute inlet side provided on the furnace wall for supplying waste to the fluidized bed incinerator, and the chute An inlet chamber attached to the outlet side of the screw type feeder, an outlet chamber attached to the inlet side of the chute, between the outlet side of the screw type feeder that supplies waste into the furnace, Supplied from the screw-type dust feeder by interposing a drum-type transporter composed of a rotary drum that is rotatably connected by a rotary joint with one end at the inlet chamber and the other end at the outlet chamber with a sealant interposed therebetween. When the discharged waste is transferred into the drum, the waste is continuously dropped from the outlet chamber of the drum-type transporter, which is transported while staying in the rotating drum , to the inlet side of the chute. configuration and Citea that way So, it can achieve the following of such excellent effect.
(1) The pulsation of the supply amount by the screw type dust feeder is averaged in the drum type transporter, and momentary supply interruption or a temporary large amount that easily occurs when the screw type feeder is fed into the furnace. Even if there is a phenomenon of falling, it is averaged in the drum and does not directly affect the furnace.
(2) Since the waste can be transported while rotating the rotating drum of the drum type transporter, the waste can be supplied continuously and quantitatively to the chute, and homogenization can be expected by stirring in the drum. .
(3) According to the above (2), it is possible to eliminate the state in which control is impossible in the furnace, to ensure the stabilization of combustion, and to suppress the generation of dioxins.
(4) Since the fluctuation range of the plant as a whole is small, it is not necessary to provide an excessive margin for the size of the furnace, ventilation and equipment of the exhaust gas treatment system.
(5) The problem when using a screw type duster in a small furnace can be eliminated.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an outline of a dust feeding device of a fluidized bed incinerator according to the present invention.
FIG. 2 is a schematic side view of a conventional fluidized bed incinerator dust feeder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fluidized bed incinerator 2 Chute 3 Fluidized bed 5 Aeration pipe 6 Waste 7 Screw type feeder 12 Drum-type transport machine 13 Outlet chamber 17 Inlet chamber 19 Rotating drum 20 Rotating joint

Claims (1)

Between the inlet side of the chute provided on the furnace wall for supplying the waste to the fluidized bed incinerator and the outlet side of the screw type dust feeder that supplies the waste into the furnace through the chute , An inlet chamber attached to the outlet side of the screw-type dust feeder, an outlet chamber attached to the inlet side of the chute, and rotation with one end interposed in the inlet chamber and the other end in the outlet chamber. When a waste material supplied from the screw type dust feeder is moved into the drum by interposing a drum-type transporter composed of a rotary drum that is rotatably connected by a joint, the waste material stays in the rotary drum . feeding dust device fluidized bed incinerator, characterized in that from the outlet chamber of the drum-type conveyor which is adapted to convey while so as to continuously drop the waste into the inlet side of the chute.

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