JPS6039755Y2 - Smelting furnace loading height measuring device - Google Patents

Description

[Detailed description of the invention] This invention relates to a load height measuring device for detecting the loading level of charging material supplied into a vertical heating distillation smelting furnace such as a zinc smelting furnace. be.

In an electric furnace for smelting zinc ore, a rotary ore feeder is installed above the top opening of the furnace, and the charge material, which is a sintered lump of zinc mixed with coke, is fed at a temperature of 400° to 700°C. The ore is sprayed into the furnace from the ore feeder.

By applying electricity to the heating electrodes installed at the top and bottom of the furnace, the charge material or load loaded into the furnace becomes a resistor and generates heat, and the coke is combusted. The sintered mass near the middle stage is heated to around 1200°C, and the zinc is volatilized.

At this time, the temperature distribution of the load is 5000 to 900° C., which is almost equal to the charging temperature at the top of the load, that is, near the level, with the center being higher in the height direction of the furnace and the top being lower.

The volatilized zinc vapor is then led from the mid-height vapor ring of the furnace to a condenser outside the furnace, where it is condensed and liquefied.

By the way, during this operation, the level of the load, that is, the height of the load, decreases as the zinc evaporates, so in order to restore the predetermined height of the load, it is necessary to bring in manufacturing personnel from the ore feeder in a timely manner. The load level can be visually checked from the outside, so the load level must be detected by some means.

However, in the past, a measuring rod was inserted or suspended into the furnace from the top opening periodically during operation, and the load height was determined by the insertion dimension when the lower end of the rod hit the top surface of the load. I was trying to detect it.

Such conventional detection means operated manually has drawbacks such as not only dangerous work but also inaccurate detection height and difficulty in continuous detection.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the purpose of the present invention is to provide a load height measuring device for a smelting furnace that can detect the load height by remote electrical measurement. .

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in FIG. 1, the measuring device of the embodiment is composed of a sensing section provided on the upper furnace wall 2 of the smelting furnace 1 and an electric measuring section placed at a suitable location outside the furnace. There is.

First, the furnace 1 is equipped with a feeder 3 in contact with the furnace top opening 1a, and heating electrodes 4 are attached to the upper furnace wall 2 above the vapor ring 14 in multiple pairs (5 pairs in the figure) from the point to the top. Detection electrode pairs 5 to 9 are fixedly installed in upper and lower multiple stages at predetermined vertical intervals, and each pair of electrodes made of a heat-resistant and conductive material such as SUS penetrates the furnace wall 2. The tip is made to protrude into the furnace, and the tip is opposed to the sealing can.

Next, the electric measurement section includes a transformer 10 as a power source that continuously supplies current to each electrode pair 5 to 9, and a meter relay 11 that reads the amount of current supplied and sends a detection signal to a recording circuit.
and a recorder 12 for recording readings and its constant voltage power supply 1.
It is formed by 3.

In this way, in the meter relay 11 and recorder 12,
The conductivity between each electrode pair 5 to 9 is displayed and recorded, but when no charging material is charged, the conductivity between each electrode pair 5 to 9 is within the furnace. The insulation resistance of the atmosphere is shown, and when the load level rises above either electrode pair, the charge material makes an electrical connection between the electrode pairs below the level. The conductivity of the input material will be indicated.

By the way, as mentioned above, the temperature of the charging material is lower at the top of the load, so the lower the level, the lower the specific resistance of the charging material.From this, the amount of current used to determine the level is If it is necessary to keep the voltage constant, it is necessary to add a compensation resistor to the circuit for each stage of electrode pairs 5 to 9.

For example, when using 30V as the power supply voltage of the transformer 10 and keeping the current amount for level determination constant at IOA, the electrode 5 is 2Ω, the electrode 6 is 1.5Ω, and the electrode 7 is 1.0Ω.
It is appropriate to add compensation resistors of 0.5 Ω to each of the electrodes 8 and 8.

In order to use the measuring device of the embodiment configured as described above, each electrode pair 5 to 9 must be energized during operation of the furnace 1, and
By checking the meter relay 11 from time to time, it can be detected that there is a load height between the electrode that has reached the determined current amount and the electrode that has a minute current amount.

In addition, when it is not possible to continuously check the meter relay 11, it is sufficient to keep the recorder 12 in operation and check the required time recorder 12, or to attach an alarm to the recorder 12 of the electrode pair at a predetermined level. If the amount of current is exceeded, an alarm will sound when the amount of current exceeds the threshold, thereby eliminating the need for workers to constantly monitor the amount of current.

In addition, some lights may adhere to the inner surface of the upper furnace wall 2 as the furnace 1 is operated, but there is no possibility that it will particularly affect the measured values.

As described above, according to the load height measuring device for a smelting furnace according to the present invention, the detection electrode pairs are fixed in multiple stages up and down through the furnace wall at the upper part of the smelting furnace, and the tip of each detection electrode pair Since the detection electrodes are arranged to protrude from the inner wall of the furnace wall while facing each other, the existence of each detection electrode does not interfere with the charging work, and the charging work can be constantly and accurately carried out without interruption. In addition, it becomes possible to detect the load height at predetermined locations in multiple upper and lower stages, which has the effect of improving the operability of the smelting furnace.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a loading height measuring device for a smelting furnace showing an embodiment of the present invention. 1...Smelting furnace, 2...Upper furnace wall, 5~
9...Pair of detection electrodes, 11.12...Meter relay and recorder as detection means.

Claims (1)

[Scope of utility model registration request] In a load height measuring device for detecting the level of charge material supplied into a vertical heating distillation smelting furnace, it is fixed through the furnace wall at the top of the smelting furnace and protrudes from the inner wall of the furnace wall. The conductivity inside the furnace is measured between the upper and lower multi-stage detection electrode pairs whose tips face each other and face the inside of the furnace, and the rain detection electrode pair.
1. A loading height measuring device for a smelting furnace, comprising means for detecting the presence or absence of charging material in a pair of rain detection electrodes based on the measured value.