JP3037054B2 - Waste supply equipment in waste fluidized bed furnace - 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 supply apparatus in a waste fluidized bed furnace.

[0002]

2. Description of the Related Art Fluid bed furnaces are used as one of the municipal solid waste incinerators because of the merit that the installation area is small.

[0003] In addition, a screw-type supply device for quantitatively supplying refuse is used in this fluidized-bed furnace. Conventionally, the amount of refuse supplied in this type of screw-type supply device depends on the combustion state in the fluidized-bed furnace.
This is performed by controlling the rotation speed of the screw, and the supply state in the screw-type supply device is not considered.

[0004]

According to the structure of the conventional screw-type supply device, the state of the screw-type supply device is not taken into account when controlling the amount of waste as described above. Depending on the type of refuse, a space may be created between the screw blades and not enough, or conversely, a lot of refuse may enter the compacted state due to too much refuse. Within
In many cases, waste could not be supplied quantitatively and efficiently.

[0005] A sensor using microwaves is provided in the chute for guiding the dust into the fluidized-bed furnace in order to grasp the supply state of the dust (for example, Kobe Steel Engineering Report: 199).
2, VOL 42, NO1; see page 108), it is conceivable to control the rotation speed of the screw of the screw type feeding device according to the amount of refuse supplied by this sensor. However, depending on the installation location, there is a dead zone upon detection of dust, and there is a drawback that malfunction occurs.

Accordingly, an object of the present invention is to provide a refuse supply apparatus in a refuse fluidized bed furnace which can solve the above-mentioned problems.

[0007]

In order to solve the above-mentioned problems, a waste supply apparatus for a waste fluidized-bed furnace according to the present invention is a waste supply apparatus for supplying waste to a fluidized-bed furnace for waste incineration, the waste supply apparatus comprising one end. A cylindrical main body in which a dust supply port is formed and a discharge port is formed in the other end, a screw rotatably arranged in the cylindrical main body, and a rotation driving device for rotating the screw, A pressure density detection sensor for detecting a pressure density of a plurality of dusts disposed on a wall of the cylindrical main body; a detection signal from the pressure density detection sensor being input and the rotation driving device being driven in accordance with the detection signal value; And a control device for controlling the control.

[0008] Further, as the pressure density detecting sensor, a strain
A gauge or a pressure sensor is used.

[0009]

According to the above construction, a pressure density sensor, for example, a strain gauge or a pressure sensor provided on the wall of the cylindrical main body .
In other words , since the pressure density of the dust in the cylindrical main body is detected and the rotation speed of the screw is controlled in accordance with the detected signal value, it is possible to reliably supply the fixed amount of dust.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a refuse supply device for supplying refuse 2 into a fluidized-bed furnace (not shown) for incinerating, for example, municipal refuse (hereinafter, simply referred to as refuse).

The refuse supply device 1 has a cylindrical main body 5 having a refuse supply port 3 formed at one end and a discharge port 4 formed at the other end, and a rotatable interior of the cylindrical main body 5. The screw 6 disposed, an electric motor (an example of a rotation driving device) 7 for rotating the screw 6, and the pressure density of a plurality of, for example, three dust disposed at predetermined intervals on the side wall 5 a of the cylindrical main body 5. (An example of a pressure density detection sensor) 8 for detecting the pressure, and a detection signal from the strain gauge 8 is input to control the rotation speed (rotation speed) of the electric motor 7 according to the detection signal value. And a control device 9.

The control device 9 is a signal converter 1 for converting a detection signal from each strain gauge 8 into a predetermined signal value.
1 and a computer (CPU) 12 for inputting a predetermined signal value from the signal converter 11 and changing the rotation speed of the electric motor 7 according to the input signal value.

For example, when the detection signal value from the strain gauge 8 is large, it is determined that a large amount of dust is moving in the cylindrical main body 5, that is, it is determined that the dust is normally supplied. If it is determined that the detection signal value from the strain gauge 8 is small, it is determined that the amount of dust moving in the cylindrical main body 5 is small, and accordingly, the computer 12
, A rotation speed increase signal is output.

On the other hand, if the detection signal value from the strain gauge 8 is too large, a large amount of dust is contained in the cylindrical main body 5, and a deceleration signal is output to the electric motor 7. In the above configuration, the refuse 2 supplied into the cylindrical main body 5 from the supply port 3 is moved toward the discharge port 4 side in the cylindrical main body 5 by the rotation of the screw 6, and is rotated by the rotation of the screw 6. , From the discharge port 4 into the fluidized bed furnace.

When the dust 2 supplied into the cylindrical main body 5 enters unevenly between the blades of the screw 6, a space A is generated at an intermediate position of the screw 6, as shown in FIG. I do.

Then, such a space A is provided by the strain gauge 8.
Comes to the place where is located, the detection signal value from the strain gauge 8 changes, that is, the detection signal value becomes small. Therefore, it is assumed that this change is detected by the computer 12 and the space A is generated. Is determined.

As described above, when it is determined that the space A is generated, a signal for increasing the rotation speed is output from the computer 12 to the electric motor 7, and the amount of the refuse 2 supplied to the fluidized bed furnace is reduced. Non-uniformity is prevented. That is, the fixed amount supply is continued.

Of course, the rotational speed of the electric motor 7 is controlled according to the size of the space A. The size of the space A can be estimated by, for example, considering all the detection signal values from the installed strain gauges 8.

Here, FIG. 2 shows a graph in which the amount of refuse supplied according to time is measured in the refuse supply apparatus of the present embodiment and the refuse supply apparatus of the conventional example. (A) shows the case of the present embodiment, and (b) shows the case of the conventional example. As can be seen from (a), the waste supply apparatus of the present embodiment is more stable in the quantitative supply of waste.

Conversely, when a consolidation state occurs in the cylindrical main body 5, the rotational speed of the electric motor 7 is also controlled. That is, when the detection signal value from the strain gauge 8 provided on the cylindrical main body 5 is too large, it is determined that a consolidation state has occurred, and the computer 12 outputs a deceleration signal to the electric motor 7.

As described above, the strain gauge 8 provided on the side wall 5a of the cylindrical main body 5 detects the pressure density of dust in the cylindrical main body 5 and controls the rotational speed of the screw 6. Therefore, it is possible to reliably supply a fixed amount of waste. That is, the combustion state in the fluidized bed furnace can be stabilized.

Further, the above configuration can be easily applied to a conventional screw-type feeding device. Further, by using together with the conventional control (ACC) adapted to the combustion state, the inside of the fluidized-bed furnace can be further improved. Can be stabilized.

In the above embodiment, three strain gauges are provided. However, the number of strain gauges can be appropriately increased or decreased depending on the detection accuracy and detection range of the pressure density. The installation location of the cylindrical body 5
Any of the peripheral wall portions may be used, but from the viewpoint of the detection accuracy of the pressure density,
More preferred.

Further, in the above embodiment, the strain gauge is used as the pressure density detecting sensor. However, for example, a pressure sensor can be used. In this case, the surface of the pressure sensor is installed so as to be exposed on the inner surface of the cylindrical main body.

[0025]

As described above, according to the structure of the present invention, a pressure density detecting sensor provided on the wall of
Since the pressure density of the dust in the cylindrical body is detected by a gauge or pressure sensor to control the rotation speed of the screw, it is possible to reliably supply a fixed amount of the dust, and as a result, the fluidized bed furnace The combustion inside can be stabilized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a refuse supply device according to an embodiment of the present invention.

FIG. 2 is a graph showing a state of supplying refuse in the refuse supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Garbage supply apparatus 2 Garbage 3 Supply port 4 Discharge port 5 Cylindrical main body 5a Side wall part 6 Screw 7 Motor 9 Control device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Etsuo Ogino 5-28, Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Michio Ito 5-chome, Nishikujo, Konohana-ku, Osaka-shi, Osaka No. 28, No. 28, Hitachi Zosen Corporation (56) References JP-A-61-96317 (JP, A) JP-A-52-16274 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) F23G 5/50 ZAB B65G 33/34 F23G 5/44 ZAB

Claims (3)

(57) [Claims] 1. A refuse supply device for supplying refuse to a fluidized-bed furnace for refuse incineration, comprising: a tubular main body having a refuse supply port formed at one end and a discharge port formed at the other end. A screw rotatably disposed in the cylindrical main body, a rotation driving device for rotating the screw, and a pressure density detecting sensor for detecting a pressure density of a plurality of dust disposed on a wall of the cylindrical main body. And a controller for inputting a detection signal from the pressure density detection sensor and controlling the rotary drive device in accordance with the detection signal value. 2. The refuse supply device in a refuse fluidized bed furnace according to claim 1, wherein the pressure density detection sensor is a strain gauge. 3. The pressure density detection sensor is a pressure sensor.
The refuse in the refuse fluidized-bed furnace according to claim 1, characterized in that:
Feeding device.