JP3016989B2 - Blast furnace refractory residual thickness measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace refractory residual thickness measuring method.

[0002]

2. Description of the Related Art Conventionally, a method for measuring the refractory remaining thickness in a blast furnace is to embed a radioactive element inside the refractory and measure the presence or absence of radiation with an RI detector from outside the furnace to measure the remaining thickness of the refractory. The presence or absence was evaluated. In this method, radiation control is required, and only the presence or absence of refractory remains is determined. In addition, there is a method of embedding a plurality of thermometers in a refractory and obtaining a residual thickness from temperature propagation from inside the furnace. In this method, there is a problem that the non-uniformity of the temperature propagation characteristic of the refractory around the thermometer has a great adverse effect on the measurement accuracy. There is also a method in which a refractory conductor is attached to a refractory, a pulse signal is transmitted to the conductor, and the remaining refractory is measured from the time until it is reflected at the tip of the conductor.
In this method, there is a problem that pulse measurement has individual differences. In addition, it is necessary that the refractory conductor be worn in synchronization with the erosion of the refractory, but in reality, there is a problem that the abrasion time is delayed and the conductor is only bent and not worn. Further, there is a problem that the measurement must be performed in a bad environment.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to stably measure even under a bad environment such as temperature and dust, and to perform remote and continuous automatic measurement.

[0004]

The present invention SUMMARY for a] has been made to advantageously solve the problems of the prior art, from the outside to the furnace body furnace shell of the blast furnace, refractory residual thickness a plurality of sheath wires tip is exposed
Insert the probe attached at any interval to suit the measurement accuracy required, the sheath wire tip refractory is attached to the wear and the probe of the is exposed in the furnace, the tip portion is blast furnace
By touching the coke and iron ore is an interior container
Check that the insulation level of the sheath conductor decreases and the current flows.
A method for measuring the residual thickness of a blast furnace refractory, wherein the residual thickness of the refractory is estimated by measuring and evaluating the electric current for each of the sheath conductors.

[0005]

The present invention will be described below in detail with reference to the drawings. 1, 2 and 3 show a probe to which a plurality of sheath wires according to the present invention are attached. The probe 1 includes a sheath 2, a sheath lead wire 3 protected by the sheath 2, a stainless steel support pipe 4 for supporting and fixing the sheath 2, and a flange 5 for fixing the furnace body. The flange No. 5 is for fixing to the blast furnace body, and prevents the gas inside the furnace from leaking outside the furnace to ensure airtightness. The sheath 2 containing the sheath conductor 3 passes through the inside of the support pipe 4, and the distal end of the sheath 2 is exposed through a hole provided in the support pipe 4 in the detection unit. This prevents the measurement from being adversely affected by the flow of the blast furnace interior charge. The exposed end of the sheath conductor 3 is slightly drawn in from the tip of the sheath 2. Note that the resolution of the detection end is determined by the interval at which the sheath conductor is fixed.

FIG. 4 shows a state in which the probe of FIG. 1 according to the present invention is installed in a blast furnace body. 1 is a probe, 6 is a blast furnace furnace shell, and 7 is a refractory remaining in the blast furnace.

FIG. 5 is an electric circuit diagram for automatically evaluating the degree of ground insulation at the tip of the sheath conductor. 8 is a constant voltage source,
9 is a circuit protector (a fuse may be used), and 3 is a sheath lead wire attached to the probe.

When the refractory of the blast furnace body wears out and the tip of the sheath wire 3 comes into contact with the blast furnace interior material (coke or iron ore), the ground insulation of the sheath wire drops and a current I flows (normally, the ground insulation). Has few hundreds to several meg Ω, so almost no current flows). Also, when the degree of insulation to the ground at the distal end of the sheath decreases, a large current (about 0.1 A) flows through the circuit protector, and the circuit protector operates.

[0009]

FIG. 6 is a comparison diagram of the results detected according to the present invention with the results of actual measurement by refractory core boring. As a result, the required accuracy for thickness control, ± 2.5
cm is almost satisfied. In principle, if the resolution of the detection end is increased in principle, the measurement accuracy is further improved. The arrows in the figure indicate the resolution of the detection end and the measurement error range of the core boring.

[0010]

According to the present invention, since the detection principle and the structure of the detection end are simple, the equipment cost is very low, and it is robust even in a bad environment such as high temperature and dust, and can measure stably. In addition, since the refractory thickness inside the furnace can be automatically measured continuously and remotely, work in adverse environments can be reduced.
Labor costs can be reduced. Conventionally, measurement was possible only during regular maintenance of a factory. However, in the present invention, since the remaining thickness can be controlled even during operation, an appropriate furnace body management action without time delay can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a probe to which a plurality of sheath wires are attached.

2 is a partially enlarged view of FIG. 1, showing a state in which a sheath is supported by a support pipe.

FIG. 3 is a partially enlarged view of FIG. 2, showing a state of a distal end portion of a sheath conductive wire.

FIG. 4 is a view showing a state in which the probe of FIG. 1 is installed in a blast furnace body.

FIG. 5 is an electric circuit diagram for automatically evaluating the insulation degree to the ground at the tip of the sheath.

FIG. 6 is a diagram illustrating a comparison between the detection end and a result obtained by core boring an actual refractory.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Probe 2 Sheath 3 Sheath wire 4 Support pipe 5 Flange 6 Blast furnace furnace steel 7 Refractory remaining in furnace 8 Constant voltage source 9 Circuit protector

────────────────────────────────────────────────── ─── Continuing on the front page (72) Nobuyuki Tango 1 Kimitsu, Kimitsu City, Chiba Prefecture Nippon Steel Corporation Kimitsu Works (58) Fields investigated (Int. Cl. ⁷ , DB name) G01M 19 / 00

Claims (1)

(57) [Claims] 1. A plurality of sheathed conductors (3) whose tips are exposed from the outside of a furnace body steel shell of a blast furnace are connected to a refractory remaining thickness measurement required precision.
The probe (1) attached at an arbitrary interval according to the degree is inserted, the refractory is worn out, the tip of the sheath wire (3) attached to the probe is exposed in the furnace, and the tip is high.
By touching the coke and iron ore
That the insulation of the sheathed conductor decreases with respect to the ground and current flows.
Utilizing blast furnace refractory residual thickness measurement method characterized by estimating the residual thickness of the refractory by evaluating current measured for each sheath wire of the.