JPH10185146A - Hopper device for incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hopper device for incineration ash capable of assuredly preventing the blowout of gas generated in a melting furnace due to the loss of a material sealing function by the incineration ash in the hopper. 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, are provided a sensor 14 for detecting the concentration of gas generated in a melting furnace 4 in the upper space 16 of the hopper 1 and a detector for giving an alarm signal when the concentration of gas detected by the sensor 14 reaches a prescribed value or higher.

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 an upper receiving port and a lower discharging port provided by the incineration ash. The present invention relates to a hopper device capable of sealing between the hoppers.

[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 is provided to temporarily store incinerated ash. The hopper has a receiving port formed at the upper part and a discharge port formed at the lower part.

[0003] By the way, carbon monoxide CO is contained in a melting furnace.
Such as reducing gas is generated. On the other hand, the incineration ash in the hopper exhibits a so-called material sealing function, and seals between the receiving port and the discharge port of the hopper. With this seal, the gas generated in the melting furnace is confined downstream of the hopper.

However, for example, the amount of incineration ash in the hopper is reduced too much, or incineration ash is accumulated on the inner wall of the hopper with foreign matter as a nucleus, or the incineration ash accumulates on the inner wall due to moisture in the incineration ash. Suspension may occur and the material sealing function may be lost. When the material sealing function is lost, gas generated in the melting furnace passes from the discharge port of the hopper to the receiving port, and is ejected out of the furnace. Since the gas generated in the melting furnace is toxic, it is dangerous to the human body, and causes a problem of abnormal combustion.

[0005] For this reason, when the material sealing function due to the incineration ash in the hopper is lost, the incineration ash is replenished to the hopper or shocks or pressures are applied to the shelves.
Material seal function recovery measures, such as extinguishing by applying vibration, must be taken as soon as possible.

Conventionally, a load cell is installed in a hopper, the total weight of the hopper containing the incinerated ash is measured by a change in strain-electric resistance, and when the total weight of the hopper decreases below a predetermined value, the incinerated ash is thrown into the hopper. That is being done.

[0007]

However, this conventional example is originally intended to control the amount of incinerated ash to be fed into a hopper. Therefore, there is an aspect unsuitable for early detection of the loss of the material seal function.

For example, the vibration of the hopper caused by the impact when the incinerated ash thrown into the hopper falls falls into the load cell detection signal as noise. For this reason, accurate weight measurement cannot be performed unless the detection signal is observed for a relatively long time and noise due to vibration has subsided. As described above, it takes a long time to detect the loss of the material sealing function, and as a result, a large amount of gas generated in the melting furnace may be ejected.

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

An object of the present invention is to provide an incineration ash hopper device capable of reliably preventing the emission of gas generated in a melting furnace due to loss of a material sealing function due to incineration ash in the hopper.

[0011]

In order to achieve this object, the present invention relates to a hopper in a hopper which receives incinerated ash from an upper receiving port, discharges the incinerated ash from a lower outlet, and supplies it to a melting furnace. In a hopper device capable of sealing between the receiving port and the discharging port by incineration ash, a sensor for detecting a gas concentration of a gas generated in the melting furnace is provided in an upper space in the hopper, A detection device is provided for issuing a warning signal when the gas concentration detected by the sensor has exceeded a predetermined value.

According to this incineration ash hopper device, the concentration of gas generated in the melting furnace in the upper space in the hopper is detected by the sensor. Then, as a result of the loss of the material sealing function due to the incineration ash in the hopper, the gas generated in the melting furnace enters the upper space in the hopper, and when the gas concentration in the upper space in the hopper becomes higher than a predetermined value, an alarm signal is issued.

[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 is provided for continuously and quantitatively supplying incineration ash generated in an incinerator (not shown) to the melting furnace 4. That is, the incineration ash supply mechanism includes a hopper 1 for temporarily storing the incineration ash, a transfer device 2 connected to the discharge port 6 of the hopper 1 for continuously supplying the incineration ash, and an outlet of the transfer device 2. And a chute 3 connecting between the inlet 10 of the melting furnace 4.

Here, the hopper 1 has a receiving port 5 and a discharging port 6 formed at the upper end and the lower end, respectively. The outlet 6 is connected to the transport device 2.

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 15.

The incineration ash 13 in the hopper 1 seals the space between the receiving port 5 and the discharging port 6. By this material seal, carbon monoxide C generated in the melting furnace 4
A reducing gas such as O is confined downstream of the hopper 1, that is, in the transfer device 2, the chute 3, and the melting furnace 4. However, if the amount of the incineration ash 13 in the hopper 1 decreases too much, the material sealing function is impaired, and as a result, gas generated in the melting furnace may be ejected outside the furnace.

Further, if foreign matter is mixed in the incineration ash supplied to the hopper 1 or the moisture content in the incineration ash is high, shelf hanging in which the incineration ash accumulates on the inner wall of the hopper 1 easily occurs. This shelving can also be one of the causes of the loss of the material seal function.

In order to prevent hanging from the shelves, a dryer (not shown) and a sieve (not shown) for incineration ash are provided upstream of the hopper 1 to reduce the moisture content of the incineration ash introduced into the hopper 1. It is desirable to reduce the amount of contaminants and foreign substances. However, there is still a risk that shelving may occur.

Therefore, means for early detecting such a shortage of incineration ash in the hopper or loss of the material seal function due to hanging of the shelf in the hopper is taken as follows. That is, the hopper 1 is provided with a detection device that issues a warning signal when the concentration of the gas generated in the melting furnace, for example, carbon monoxide gas CO becomes equal to or higher than a predetermined value (for example, 50 ppm).
That is, a sensor 14 for detecting a gas concentration is provided in an upper space 16 in the hopper 1, and a warning signal is issued when the gas concentration detected by the sensor 14 exceeds a predetermined value.

When the concentration of carbon monoxide CO reaches 500 ppm, it can be said that an abnormal situation has occurred. In the present embodiment, a warning signal is issued when the concentration of carbon monoxide CO becomes 50 ppm.

The gas generated in the melting furnace to be detected by the sensor 14 is not limited to the carbon monoxide gas CO, but may be, for example, the concentrations of carbon dioxide CO ₂ and hydrogen H ₂ .

According to the incineration ash hopper device configured as described above, the loss of the material seal function is detected as follows.

The incineration ash generated in the incinerator is temporarily stored in a hopper 1 and then conveyed quantitatively by a screw feeder 8 in a conveying device 2 and then dropped into a chute 3 to be melted into a melting furnace 4. You.

In the hopper 1, the incineration ash 13 seals the gap between the upper receiving port 5 and the lower discharging port 6. Due to this material seal, generated gas in the melting furnace containing carbon monoxide CO is confined downstream of the hopper 1.

However, for example, the incineration ash 13 in the hopper 1
Is too small, or the shelf is suspended in the hopper 1, the material sealing function of the incineration ash 13 is lost. When the material seal function is lost, the gas generated in the melting furnace passes from the discharge port 6 of the hopper 1, passes through the deficient portion of the incineration ash seal, and enters the upper space in the hopper 1.

As a result, the concentration of carbon monoxide CO in the upper space 16 of the hopper 1 increases. On the other hand, the sensor 14 detects the concentration of carbon monoxide CO in the upper space 16 and issues a warning signal when the concentration of carbon monoxide CO reaches 50 ppm.

An alarm is issued by this warning signal. And
For example, the material sealing function is restored by taking a countermeasure such as putting sufficient incineration ash into the hopper 1 or breaking a hanging shelf by applying an impact or the like. If the material sealing function is restored, it is possible to prevent high-concentration carbon monoxide CO or the like from squirting into the incinerator.

[0032]

According to the incineration ash hopper device of the present invention described above, the concentration of gas generated in the melting furnace in the upper space in the hopper is detected by the sensor, and an alarm signal is issued when the gas concentration exceeds a predetermined value. Therefore, the material sealing function is directly monitored compared to the conventional example in which the loss of the sealing function is detected by measuring the total weight of the hopper by using the load cell, and the material sealing function is quickly performed regardless of the vibration of the hopper. Loss of function can be detected, and ejection of gas generated in the melting furnace can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing an incineration ash supply mechanism including an embodiment of an incineration ash hopper device of the present invention and a melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 4 Melting furnace 5 Reception port 6 Discharge port 13 Incineration ash 14 Sensor for detecting gas concentration 16 Upper space

Claims (1)

[Claims] 1. An incineration ash is received from an upper receiving port, and the incinerated ash is discharged from a lower discharging port and supplied to a melting furnace. The incinerated ash in a hopper is sealed between the receiving port and the discharging port. In a hopper device which is capable of, a sensor for detecting a gas concentration of a gas generated in a melting furnace is provided in an upper space in the hopper, and when a gas concentration detected by the sensor becomes a predetermined value or more, An incineration ash hopper device comprising a detection device for issuing a warning signal.