JPH10185147A - Hopper device for incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hopper device for incineration ash capable of detecting early the loss of a material sealing function resulting from the shortage of the quantity of incineration ash in a hopper and thus assuredly preventing the blowout of gas generated in a melting furnace. SOLUTION: A hopper device for incineration ash has a hopper 1 comprising an upper receiving port 5 for receiving incineration ash and a lower exhaust port 6 for exhausting the incineration ash by which a part between the receiving port 5 and the exhaust port 6 can be sealed. In the hopper device, is provided a sensor device 15 for generating a signal when the upper level 13A of the incineration ash in the hopper 1 falls to a prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper device provided in a path for supplying incineration ash generated in an incinerator to a melting furnace, and more particularly to a hopper device provided between an inlet and an outlet by incineration ash in the hopper. And a hopper device capable of sealing the hopper.

[0002]

2. Description of the Related Art Incineration ash generated in an incinerator is melted in a melting furnace. It is also known to provide a hopper in a path for supplying incinerated ash from an incinerator to a melting furnace. This hopper receives incineration ash from the upper entrance,
It is configured to discharge from a lower outlet.

In a melting furnace, carbon monoxide CO
Such as reducing gas is generated. On the other hand, the incineration ash in the hopper exhibits a material sealing function of sealing between the receiving port and the discharge port of the hopper, and traps gas generated in the melting furnace downstream of the hopper.

[0004] However, when the amount of incineration ash in the hopper becomes less than a predetermined value, the material sealing function due to the incineration ash in the hopper is lost. Then, the gas generated in the melting furnace passes from the discharge port of the hopper to the receiving port and is jetted into the incinerator.
If the gas generated in the melting furnace blows out into the incinerator, it is toxic and is dangerous to the human body, and may cause abnormal combustion.

[0005] In order to detect the loss of the material seal function due to the shortage of incineration ash in the hopper, a load cell is conventionally installed in the hopper.

[0006] This is because the load cell measures the total weight of the hopper based on a change in strain-electric resistance, and when the total weight of the hopper falls below a predetermined value, the amount of incinerated ash may be insufficient and the material sealing function may be lost. Ash is supplied to the hopper.

[0007]

However, the measurement of the total weight by the load cell is originally intended to control the amount of incinerated ash supplied to the hopper. Therefore, there is an unsuitable aspect for early detection of a material seal.
For example, the vibration of the hopper due to the impact of the incineration ash falling into the hopper is mixed in the detection signal of the load cell as noise. Therefore, accurate weight measurement, that is, loss of material seal function cannot be detected unless the detection signal is observed for a relatively long time to suppress the vibration noise.

If it takes a long time to detect the loss of the material sealing function, a large amount of gas generated in the melting furnace is ejected during that time.

The present invention has been made to solve the problems of the conventional example.

An object of the present invention is to detect early the loss of a material seal function due to an insufficient amount of incineration ash in a hopper,
Accordingly, it is an object of the present invention to provide an incineration ash hopper device capable of reliably preventing the emission of gas generated in a melting furnace.

[0011]

In order to achieve this object, the present invention relates to the above-mentioned receiving ash in a hopper which receives incinerated ash from an upper receiving port and discharges the incinerated ash from a lower discharging port. A hopper device capable of sealing between the hopper and the discharge port has a sensor device that emits a signal when the upper level of the incineration ash in the hopper drops to a predetermined position.

According to this incineration ash hopper device, when the upper surface level of the incineration ash in the hopper falls to a predetermined position, the sensor detects this and issues a signal.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the incineration ash hopper device of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an incineration ash supply mechanism and a melting furnace having an embodiment of an incineration ash hopper device of the present invention.

The incineration ash supply mechanism includes a hopper 1 for temporarily storing the incineration ash, a transport device 2 connected to the discharge port 6 of the hopper 1 for continuously transporting the incineration ash, It comprises a chute 3 connecting between the outlet 10 and the inlet 22 of the melting furnace 4.

Here, the hopper 1 is formed with a receiving port 5 and a discharging port 6 at an upper portion and a lower portion, respectively.

In the present embodiment, the transport device 2 includes a casing 7 formed in a tubular shape extending in the lateral direction, and a screw feeder 8 disposed in the casing 7.

The casing 7 has an inlet 9 and an outlet 10 at an upper end and a lower end of the other end, respectively.
The screw feeder 8 is provided to convey the incinerated ash introduced into the casing 7 from the inlet 9 toward the outlet 10. The screw feeder 8 has a rotating shaft 11
, A spiral feed blade 12 is provided. The rotating shaft 11 is configured to transmit a rotating force from a rotation driving mechanism (not shown).

The chute 3 is formed in a cylindrical shape, and is provided for dropping and supplying incinerated ash into the melting furnace 4. The incinerated ash is melted in the melting furnace 4 to become a melt 14.

The incineration ash 13 in the hopper 1 has a material sealing function and seals between the receiving port 5 and the discharging port 6. By this material seal, a reducing gas such as carbon monoxide CO generated in the melting furnace 4 is confined downstream of the hopper 1, that is, in the transfer device 2, the chute 3, and the melting furnace 4.

However, when the amount of incinerated ash in the hopper 1 decreases to a predetermined value or less, the material sealing function is lost. Then, the gas generated in the melting furnace may pass from the discharge port 6 of the hopper 1 to the receiving port 5 and be ejected into the incinerator. The gas generated in the melting furnace is toxic and therefore dangerous to the human body, and has a problem of causing abnormal combustion in the incinerator.

Therefore, in the present invention, a sensor device is provided which emits a signal when the level of the upper surface 13A of the incineration ash in the hopper 1 drops to a predetermined position. That is, the hopper 1
If the level of the upper surface 13A of the incineration ash in the inside falls to a predetermined position, it is considered that the material seal function is lost, a signal is issued, a warning is issued, and countermeasures such as replenishment of the incineration ash to the hopper 1 are taken. I am taking it.

In the embodiment shown in FIGS. 1 and 2, the hopper 1
Sensors 15 and 16 for continuously measuring the upper surface level 13A of the incinerated ash from the receiving inlet 5 side of the incineration ash are provided. And
A signal is issued when the level of the upper surface 13A drops to a predetermined position.

FIG. 1 shows a reflection type sensor 15.
It is shown. That is, the sensor 15 emits microwaves, lasers, ultrasonic waves, or the like in the vertical direction toward the upper surface 13A of the incineration ash 13, and receives and processes the reflected waves vertically reflected on the upper surface 13A to measure the level. It is.

In this embodiment, the signal is issued as soon as it is detected that the signal has dropped below a predetermined level. However, the present invention is not limited to this. May be issued.

When this signal is issued, an alarm is issued and a countermeasure such as replenishment of the hopper 1 with incineration ash is taken.

FIG. 2 shows an example of a mechanical sensor 16. The sensor 16 includes a contact 17 that constantly contacts the upper surface 13A of the incineration ash 13 by gravity, a tension member 18 such as a wire that hangs the contact 17 to one end,
A pulley 19 for hanging the tension member 18 and a balancer 2 suspended by the other end of the tension member 18 to balance the weight of the contact 17.
0. Then, the level of the upper surface 13A of the incineration ash 13 is detected from the length of the tension body 18 extending vertically from the pulley 19 toward the upper surface 13A of the incineration ash 13.

In the embodiment of FIG. 3, the sensor is the hopper 1
Transmitting element 21A mounted at a predetermined height on the side of
And the receiving element 21B. The transmitting element 21A and the receiving element 21B are mounted at a predetermined height of the hopper 1 so as to face each other in the horizontal direction. Outgoing element 2
1A always emits light, infrared rays, X-rays, etc. in the horizontal direction toward the receiving element 21B. On the other hand, the receiving element 21A is made up of a photoelectric tube or the like that receives the light or the like and converts it electrically.

When the level of the upper surface 13A of the incineration ash 13 is higher than the positions of the transmitting element 21A and the receiving element 21B, light emitted from the transmitting element 21A is blocked by the incineration ash 13 and does not reach the receiving element 21B.

When the level of the upper surface 13A of the incineration ash 13 falls below the positions of the transmitting element 21A and the receiving element 21B,
Light emitted from the transmitting element 21A reaches the receiving element 21B. At this time, the receiving element 21B issues an alarm signal.

[0031]

According to the hopper device for incinerated ash of the present invention described above, when the upper surface level of incinerated ash in the hopper drops to a predetermined position, the sensor detects this and issues a signal. Therefore, compared to the conventional method of measuring the total weight of the hopper using a load cell, it has nothing to do with the vibration of the hopper,
Loss of the material seal function in the hopper can be detected early and reliably, and measures to recover the material seal function, such as replenishment of incineration ash to the hopper, can be taken at an early stage. Can be blocked.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an incineration ash supply mechanism provided with an embodiment of an incineration ash hopper device of the present invention and a melting furnace.

FIG. 2 is a schematic front view of an incineration ash supply mechanism provided with another embodiment of the incineration ash hopper device of the present invention and a melting furnace.

FIG. 3 is a schematic front view of an incineration ash supply mechanism and a melting furnace provided with still another embodiment of the incineration ash hopper device of the present invention.

[Explanation of symbols]

 1 hopper 13 incineration ash 13A top surface of incineration ash 15 sensor 16 sensor 21A transmitting element (sensor) 21B receiving element (sensor)

Claims (3)

[Claims] 1. The incineration ash in a hopper that receives incinerated ash from an upper receiving port and discharges the incinerated ash from a lower discharging port can seal between the receiving port and the discharging port. An incineration ash hopper device, comprising: a sensor device for emitting a signal when the upper surface level of the incineration ash in the hopper drops to a predetermined position. 2. The sensor device has a sensor for continuously measuring an upper surface level of incinerated ash from a receiving port side of a hopper, and emits a signal when the upper surface level drops to a predetermined position. The incineration ash hopper device according to claim 1, wherein 3. The sensor device has a sensor mounted at a predetermined position on the side of the hopper, and emits a signal when the upper level of the incinerated ash falls to the predetermined position. The incineration ash hopper device according to claim 1.