JPH10339424A - Ash melting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize operation by grasping the amount of molten slag in a furnace without being influenced by a severe environment in the furnace. SOLUTION: An ash melting furnace F is placed on a frame 12 and is supported to be capable of being inclined. A load cell 22 is disposed on a lower part of the frame 12 whereby total weights of the ash melting furnace F and attachments are continuously measured. Based upon a load measured by the load cell 22 the amount of molten slag 8 in the furnace is estimated in an arithmetic operation device 23. Based upon the estimated amount of the molten slag 8 a driver 16 for an ash supplier 15, an electrode power supply 19, and a driver 14 for a cast outlet opening/closing apparatus 13 are adjusted to control operation parameters such as the amount of ash introduction, the amount of melting energy insertion, and the amount of taking-out of the molten slag 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash melting facility for melting ash such as refuse incineration ash and fly ash in an ash melting furnace.

[0002]

2. Description of the Related Art Among such seed ash melting equipment, the one using an electric resistance type ash melting furnace is capable of ascending and descending a central portion of a furnace lid 2 of an ash melting furnace F, as schematically shown in FIG. The current flows through the molten slag 8 between the upper electrode 4 as the main electrode inserted into the molten slag 8 on the molten metal layer in the furnace body 1 and the furnace bottom electrode 5 provided on the furnace bottom 3. , The molten slag 8 itself is used as a heat source, and the ash 7 as the material to be melted which has been introduced into the furnace body 1 through the ash inlet 6 is sequentially melted by Joule heat. When the level of the slag 8 increases, the molten slag 8 is discharged to the outside through the slag port 9 at the lower part of the furnace wall by the head pressure applied by its own weight.

[0003] In addition, in order to tilt the ash melting furnace F to discharge ash, the ash melting furnace F includes:
The operation of the tilt cylinder 10 as a tilt device causes the hinge 11 to move.
Is fixed on a gantry 12 capable of tilting displacement around a fulcrum so that the slag port 9 is located on the hinge 11 side. By inclining F, the molten slag 8 in the furnace body 1 can be discharged from the slag port 9.
13 is a slag opening / closing device for opening and closing the slag opening 9 by a slide gate 13a, 14 is a driving device of the slag opening / closing device 13, 15 is an ash supply device driven by a driving device 16, and 17 is a ash supply device. An exhaust gas pipe connected to the exhaust gas outlet 18 and 19 indicates an electrode power supply. The ash supply device 1
Flexible hoses 20 and 21 are interposed between the pipe 5 and the exhaust gas pipe 17 so that the tilt displacement of the furnace body 1 can be absorbed.

[0004] In the above ash melting facility, the amount of the molten slag 8 is small, the amount of heat for melting the ash 7 is insufficient when the amount of the molten slag 8 is small, due to the relationship between the amount of the ash 7 charged into the furnace and the amount of the molten slag 8. On the other hand, if the amount of the ash 7 is too large, the ash 7 cannot be melted by the heat of the molten slag 8 and unmelted ash will be discharged. It is necessary to control the input,
The amount of the molten slag 8 in the furnace is grasped, the amount of the ash 7 charged, the amount of the molten slag 8 extracted, the amount of the molten energy input (power supply) and the like are controlled, and the amount of the molten slag 8 is kept constant. It is very important for the operation to do so, and studies for detecting the amount of molten slag in the ash melting furnace have been conventionally conducted.

[0005] As a conventional method for grasping the amount of the molten slag 8 in the furnace, a thermocouple is lowered from the upper part in the furnace,
A method in which the upper surface level of the molten slag 8 is detected based on the temperature change point to grasp the amount of the molten slag 8, or one electrode is formed by utilizing the conductivity of the molten slag 8 Then, another electrode is lowered from the upper part of the furnace, and when it comes into contact with the molten slag 8, a current flows between the electrodes.
, Which detects the upper surface level.

[0006]

However, any of the above methods is not suitable for continuous measurement.
The temperature inside the furnace is very high, around 1400 ° C, and it is under severe atmosphere conditions in which Cl and the like in the ash are volatilized. Therefore, the life of the thermocouple is extremely short and it may burn out in one measurement. Erroneous measurement is likely to occur.

Therefore, the present invention enables continuous measurement of the amount of molten slag without being affected by the severe atmosphere in the ash melting furnace, and further controls operating parameters based on the measured amount of molten slag. Is to try to be able to.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above problem by energizing ash by passing electricity between an upper electrode placed in a furnace through a furnace lid and a furnace bottom electrode placed on the furnace bottom. In an ash melting facility having an ash melting furnace that is melted into a molten slag, one or more load measuring devices are installed to receive the ash melting furnace and measure the total load of the ash melting furnace and attached devices. And an arithmetic unit for calculating the amount of molten slag in the furnace based on the value measured by the load measuring device.

Since the load measuring device continuously measures the load of the furnace, the amount of molten slag in the furnace is continuously measured by the arithmetic device based on the measured value. At this time, since the load measuring device is located outside the furnace, it can be accurately measured for a long period without being exposed to a severe atmosphere in the furnace.

Further, a control command is sent to the driving device of the ash supply device, the electrode power supply, and the driving device of the slag opening / closing device based on the amount of the molten slag obtained by the arithmetic device. The operation is stabilized because the ash input amount, the melting energy input amount, and the molten slag extraction amount are adjusted.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. As in the ash melting facility shown in FIG. 2, a gantry 12 on which an ash melting furnace F is mounted and fixed is hinged by the expansion and contraction operation of a tilting cylinder 10. In a configuration in which the ash melting furnace F is tilted by tilting with the fulcrum 11 as a fulcrum, a load cell 22 as a load measuring device is installed near the tilt cylinder 10, and the ash melting furnace is F can be received via the gantry 12, so that the total load of the gantry 12, the ash melting furnace F, etc. can be measured, and based on the load value measured by the load cell 22, the ash melting furnace F An arithmetic unit 23 capable of determining the amount of the molten slag 8 is provided.

Based on the amount of the molten slag 8 obtained by the arithmetic unit 23, a control command is sent to the drive unit 16 of the ash supply unit 15, the electrode power supply 19, and the drive unit 14 of the slag opening / closing unit 13. Operation parameters such as the ash input amount, the melting energy input amount, and the molten slag extraction amount are adjusted.

The number of load cells 22 may be one if it is for a large load, but may be two or more. Other configurations are the same as those shown in FIG. 2, and the same components are denoted by the same reference numerals.

A gantry 12 that tilts about a hinge 11 as a fulcrum,
The ash melting furnace F itself on the gantry 12 and other ash melting furnaces F
Since the loads of the devices such as the ash supply device 15 attached to the apparatus are known in advance, these loads are input in advance to the arithmetic unit 23, and during the operation of the ash melting furnace F, the tilt cylinder 10 is shortened and the load cell 22 is used. When the load of the ash melting furnace F is received, the load of the entire ash melting furnace F and the equipment attached thereto can be continuously measured as a cantilever load by the load cell 22, and the measured value is calculated. By inputting to the device 23, the amount of the molten slag 8 in the furnace can be obtained from the difference between the total load of the gantry 12, the ash melting furnace F itself, and the like, which are input in advance. Thereby, the ash melting furnace F
The amount of the molten slag 8 in the furnace can be grasped from outside.

Next, the molten slag 8 determined by the arithmetic unit 23
The control command is output from the arithmetic unit 23 to the drive unit 16 of the ash supply unit 15, the electrode power supply 19, and the drive unit 14 of the slag opening / closing unit 13 based on the amount of. In this case, if the amount of the molten slag 8 is small, a control command is sent to the driving device 16 of the ash supply device 15 so that the ash 7
Is controlled so as to increase the input amount of the electrode, and a control command is sent to the electrode power supply 19 so that the current flowing between the electrodes 4 and 5 is controlled to be increased. When the control command is sent, the amount of the molten slag 8 is controlled so as to be adjusted by the slide gate 13a so that the opening amount of the slag port 9 is reduced. On the other hand, when the amount of the molten slag 8 is large, control opposite to the above is performed, and the amount of the molten slag 8 is adjusted to be constant.

As described above, the load cell 22 is used to continuously measure the weight of the ash melting furnace F and the entire equipment attached thereto to obtain the amount of the molten slag 8, so that the amount of the molten slag 8 is measured in the furnace. The amount of the molten slag 8 can be obtained without inserting the device, and the load cell 2 as a measuring device can be obtained.
2 is not affected by the harsh atmosphere in the furnace,
The load can be reliably measured over a long period of time. In addition, since the arithmetic unit 23 sends a control command to each part based on the change data of the measured value, the amounts of the molten slag 8 and the ash 7 in the furnace can be appropriately controlled, and a stable operation is performed. be able to.

Although the present invention is not limited to the above embodiment, a load cell is exemplified as a load measuring device. However, the load cell may be replaced by a load cell. Can be selected arbitrarily in consideration of the weight of the ash-melting furnace and the like, and furthermore, the ash-melting furnace of the type that does not need to be tilted can be implemented in the same manner, and various changes are made without departing from the gist of the present invention. Obviously you can get it.

[0019]

As described above, according to the ash melting equipment of the present invention, the ash is melted by energizing between the upper electrode placed in the furnace through the furnace lid and the bottom electrode placed on the furnace bottom. In an ash melting facility having an ash melting furnace which is made into a molten slag, one or a plurality of load measuring devices for receiving the ash melting furnace and measuring the total load of the ash melting furnace and attached equipment are installed. In addition, since it has a configuration provided with an arithmetic unit for calculating the amount of molten slag in the furnace based on the value measured by the load measuring device, the amount of molten slag can be obtained from the total weight, and the measuring device The load measuring device as described above can be continuously measured for a long time without being placed in the severe atmosphere in the furnace, and based on the amount of molten slag obtained by the arithmetic device, the ash supply device Driving device, electrode power supply, slag opening / closing device By adopting a configuration in which a control command is sent to the drive unit, the amount of ash input, electrode current, and amount of molten slag withdrawn can be controlled based on the measured amount of molten slag, and the amount of molten slag can be controlled. An excellent effect of being able to be kept constant and stabilizing the operation is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of an ash melting facility of the present invention.

FIG. 2 is a schematic diagram showing an example of an ash melting facility.

[Explanation of symbols]

 F Ash melting furnace 1 Furnace body 2 Furnace lid 3 Furnace bottom 4 Upper electrode 5 Furnace bottom electrode 7 Ash 8 Melting slag 13 Slag opening / closing device 14 Drive device 15 Ash supply device 16 Drive device 19 Electrode power supply 22 Load cell (Load measuring device) ) 23 arithmetic unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23G 5/50 ZAB F23G 5/50 ZABG ZABJ (72) Inventor Jojiro Umeda 1 Shinnakaharacho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima Harima Heavy Industries Co., Ltd. (72) Inventor Kenichi Tahara 1 Kawasaki Harima Heavy Industries Co., Ltd.

Claims (2)

[Claims] 1. An ash melting furnace having a configuration in which ash is melted by turning on electricity between an upper electrode disposed in a furnace body through a furnace lid and a furnace bottom electrode installed on a furnace bottom to form a molten slag. In the ash melting equipment, one or more load measuring devices are installed to receive the ash melting furnace and measure the total load of the ash melting furnace and the attached equipment, and in the furnace based on the measured values by the load measuring device. An ash melting facility having a configuration provided with an arithmetic unit for obtaining the amount of molten slag. 2. A control command is sent to a driving device of an ash supply device, an electrode power supply, and a driving device of a slag opening / closing device based on the amount of molten slag obtained by the arithmetic device. 2. The ash melting facility according to claim 1, wherein the molten energy input amount and the molten slag withdrawal amount can be adjusted simultaneously or individually.