KR20030052731A - Apparatus for estimation of dead man in blast furnace and the same method - Google Patents

Abstract

PURPOSE: An apparatus for diagnosing the state of dead man in blast furnace is provided in which the filling state is easily analyzed, accuracy is improved, handling is easy, and the state of the dead man is diagnosed in realtime, and a method therefor is provided. CONSTITUTION: In a blast furnace dead man state diagnosing apparatus for diagnosing the state of dead man of blast furnace by measuring the filling state of blast furnace coke layer, the apparatus for diagnosing the state of dead man in blast furnace comprises a load measuring means(120) installed at the rear end of a lance(110) inserted into a tuyere for blowing hot blast into the blast furnace to measure load generated by inserting resistance during inserting of the lance; a displacement measuring means(130) for measuring insertion length of the lance; a data logger(140) for storing signals transmitted from the load measuring means and displacement measuring means; and an operation part(150) for diagnosing the state of dead man in the blast furnace by operating the stored data of the data logger. The method for diagnosing the state of dead man in blast furnace comprises a lance inserting step of inserting a lance into the blast furnace through a tuyere of the blast furnace; a measuring step of measuring a load generated by inserting resistance of the lance in the lance inserting step and insertion length of the lance; a data storage step of storing data obtained through the measuring step; and a diagnosing step of diagnosing the state of coke using the data stored in the data storage step.

Description

Apparatus for estimation of dead man in blast furnace and the same method}

The present invention relates to a blast furnace core state diagnosis apparatus and method for diagnosing the state of the blast furnace core during the blast furnace, more specifically, the insertion of the lance through the blast furnace during the blast furnace and the force applied to the rear end of the lance and the rate of entry of the lance The present invention relates to a blast furnace core state diagnosis apparatus and method for diagnosing slope change and diagnosing coke state of the core.

In general, the blast furnace is a kind of industrial furnace for charging molten iron and coke through the top of the furnace, supplying hot air through the bottom vent, reducing and dissolving iron ore as the coke is burned by the hot air.

As shown in FIG. 1, the filling structure of the lower part of the blast furnace is filled with coke 20 at the lower part of the blast furnace 100, and the molten iron 18 and the slag 18 are formed through the air gap between the coke 20. The drop is discharged to the outside of the blast furnace 100 through the outlet 14.

At this time, the hot air introduced through the tuyere 10 forms a cavity at the tip of the tuyere 10 below the blast furnace 100 and generates a reducing gas in the cavity. ), The distance from the tip of the tuyere 10 to the end of the combustion zone 12 is defined as the combustion zone depth.

Here, the combustion zone 12 is a factor that is importantly managed in operation as a reaction field for determining heat and gas supply of the blast furnace 100.

And the coke filling layer located in the center of the blast furnace 100 from the combustion table 12 is normally called core coke layer.

The coke filling state of the core coke layer is an important factor in discharging molten iron and molten molten slag.

It is generally known that the melt of molten iron and slag is most dripped through the area within 1 to 2.5m in front of the tuyere.

On the other hand, when the core coke layer has a lower porosity due to unburned pulverized coal or differentiated coke, the core passage amount of hot gas is reduced, thereby lowering the core temperature, thereby resulting in unstable operation such as delay in starting the ship.

Therefore, in order to perform stable blast furnace operation, it is necessary to accurately determine the filling state of the core coke layer.

In order to understand the structure of the core coke layer, a method of inserting a sonde equipped with a thrust measuring device from the bosch part, which is located at the upper part of the tuyere, to the upper part of the combustion zone, is disclosed in Japanese Patent Laid-Open No. have.

However, the disclosed method is difficult to analyze the radial filling state because the sonde is inserted in the inclined direction, and since the core coke cannot be collected, it is impossible to feed back the actual result and thus the accuracy is low.

In addition, another method of determining the core coke layer structure is to inject the radioisotope into the air-filled core filling layer by the air-ball level, and to analyze the discharge time to the exit port. It is disclosed in Unexamined-Japanese-Patent No. 9-279207.

However, since these methods use radioactive elements, there are risks in handling, and there is a problem in that an analysis error exists and takes a long time because radioactive elements have to go through a component analysis step after being discharged from the exit port.

Therefore, the present invention has been made to solve the problems of the prior art, the object of the present invention is to provide a blast furnace core state diagnosis apparatus and method for easy analysis of the filling state and improved precision.

In addition, another object of the present invention is to provide a blast furnace core state diagnosis apparatus and diagnostic method that is easy to handle and capable of diagnosing the state of the core in real time.

1 is a state diagram showing the filling structure of the lower part of a typical blast furnace.

2 schematically illustrates a core state diagnostic apparatus according to the present invention.

3 is a graph showing the change of the load value according to the distance from the tuyere of the actual blast furnace;

4 is a graph showing the distribution of coke ratio of 3 mm or less in diameter by directly taking coke in a tuyere.

5 is a graph showing a change in load and a change in the lance insertion speed with time during insertion of the lance according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: blast furnace 120: load measuring means

130: displacement measurement means 140: data logger

150: calculation unit

In order to achieve the above object, the present invention is a blast furnace core state diagnosis apparatus for measuring the filling state of the blast furnace coke layer, the core state of the blast furnace, installed in the rear end of the lance is inserted into the blast to blow hot air into the blast furnace Load measuring means for measuring the load generated by the insertion resistance during insertion, displacement measuring means for measuring the insertion length of the lance, data logger for storing signals transmitted from the load measuring means and the displacement measuring means, stored data of the data logger The present invention provides a blast furnace core state diagnosis apparatus including an operation unit for diagnosing the blast furnace core state.

In addition, the present invention is a method for diagnosing the core state of the blast furnace by measuring the filling state of the blast furnace coke layer, the lance insertion step of inserting the lance through the blast blast, the lance insertion step in the lance insertion resistance The blast furnace core includes a measuring step of measuring the load generated by the load and the insertion length of the lance, a data storing step of storing data obtained through the measuring step, and a diagnosis step of diagnosing the state of coke using the data stored in the data storing step. Provide a method for diagnosing the condition.

Here, it is preferable to diagnose the dense filling zone when the insertion speed is 0.2m / s or less when the lance is inserted in the diagnosis step.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view schematically showing a core state diagnostic apparatus according to the present invention.

The blast furnace core state diagnosis apparatus according to the present invention includes load measuring means 120 installed at the rear end of the lance 110 inserted into the tuyere, displacement measuring means 130 for measuring the insertion length of the lance 110 and , A data logger 140 storing signals transmitted from the load measuring means 120 and the displacement measuring means 130, and an operation unit that diagnoses the blast furnace core state by calculating the stored data of the data logger 140 ( 150).

First, the load measuring means 120 is provided with a load cell (Load cell), which is an essential weighing element in the electronic balance represented by numbers, and the load cell is deformed, such as being compressed or stretched under load, and the amount of deformation The analog electric signal measured by is converted into a digital signal and transmitted to the data log.

Next, the displacement measuring unit 130 measures the length of the wire as a means for measuring the length of the lance 110 is inserted, and converts the measured analog electric signal into a digital signal and is transmitted to the data log.

Next, the data log 140 is a computer in which the digital signals generated by the load measuring means 120 and the displacement measuring means 130 are transmitted and stored.

Next, the calculation unit 150 diagnoses the blast furnace core state by using the data stored in the data log 140.

Here, the core state of the blast furnace diagnosed by the calculating unit 150 is first collected by analyzing the coke through the air vent during the blast furnace, and according to the analysis results, the coke-filled state of the bottom of the blast furnace is less dense in the combustion zone area, the end of the combustion zone and the core Minutes begin to accumulate from the beginning and become dense.

Therefore, when the lance 110 is inserted from the tip of the tuyere, the load applied to the lance is low due to the low insertion resistance when passing through the combustion zone region, and the load starts to rise from the point of reaching the core.

In addition, if the propulsion force for pushing the lance 110 is made constant, the entrance speed of the lance is fast because of less insertion resistance in the combustion zone, and starts to slow down from the point of contact with the tightly packed region.

Therefore, the blast furnace core state can be diagnosed by measuring a change in the load applied to the lance 110 and the insertion speed of the lance 110.

In the blast furnace core state diagnosis method according to the present invention, the lance insertion step of inserting the lance through the blast furnace blast, the load applied to the rear of the lance and the measurement step of measuring the insertion length of the lance, the data obtained through the measuring step A storage step of storing, and a diagnostic step of diagnosing the state of coke based on the data stored in the storing step.

First, the lance insertion step inserts the lance through the tuyere during the absence of air, and the insertion speed is changed according to the state of the coke during insertion.

Next, in the measuring step, the load applied to the rear of the lance is measured by a predetermined time unit using a load measuring means, and at the same time, the insertion length of the lance is measured by a predetermined time unit.

Next, the storing step is to store the data measured in the measuring step and to diagnose the core state using the stored data.

Next, in the diagnosis step, the state of the core is diagnosed using the data stored in the storage step.

Figure 3 shows the change in load value according to the distance from the tuyere measured at the time of the actual blast furnace.

As shown in FIG. 3, the load rapidly increases from about 2.3m while maintaining the 0.1Ton when the lance is inserted. From this, it can be seen that the coke is densely distributed from the 2.3m or more region.

4 is a graph showing the distribution of the coke ratio of 3 mm or less in diameter by directly collecting coke in the tuyere.

In actual operation, when the coke ratio of 3 mm or less in diameter increases, the porosity of the core is reduced, which lowers the gas permeability and the melt liquidity, which causes trouble in the operation.

That is, the point in which the load shown in FIG. 3 rises sharply is a region where the coke ratio of 3 mm or less in diameter is distributed in a large amount of 40% or more and is considered to be a region having low gas breathability.

Therefore, in the present invention, since the filling state of the core can be grasped, it can be estimated as a poor aeration zone from the point where the load sharply rises.

5 is a graph showing the change in load and the lance insertion speed with time when the lance is inserted according to the present invention, the x axis is the elapsed time of the experiment, the y1 axis is the load, the y2 axis shows the change of the insertion speed with the elapsed time. .

Therefore, as shown in FIG. 5, since the initial stage of insertion passes through the combustion zone with low insertion resistance, the insertion speed of the lance is maintained while the insertion speed of the lance is gradually decreased, so that the insertion speed of the lance falls in the region where the core filling structure is dense. Can be.

Here, when comparing with the rising point of the load, the point where the insertion speed of the lance falls below 0.2m / s can be defined as the starting point of the dense core filling layer, through the size analysis of this area through the core air permeability, liquid permeability You can judge the good and bad.

As described above, the apparatus and method for diagnosing the blast furnace core state according to the present invention are installed at the rear end of the lance to measure the load and displacement, and the filling state of the coke layer of the core is based on the measured data. You can diagnose in real time.

Therefore, after diagnosing the change of the blast furnace core condition in real time and analyzing the size of the bad ventilation zone, the operation conditions are changed to bring down the bad ventilation zone through correlation analysis with the operating conditions, so Improve blast furnace productivity and stabilize operations.

Claims (3)

In the blast furnace core state diagnosis device for diagnosing the core state of the blast furnace by measuring the filling state of the blast furnace coke layer, Load measuring means for measuring the load generated by the insertion resistance when the lance is inserted into the rear end of the lance to be inserted into the blast hole for blowing hot air into the blast furnace, displacement measuring means for measuring the insertion length of the lance, and the load And a data logger for storing the signal transmitted from the measuring means and the displacement measuring means, and a calculation unit for calculating the blast furnace core state by calculating the stored data of the data logger. In the blast furnace core state diagnosis method for diagnosing the core state of the blast furnace by measuring the filling state of the blast furnace coke layer, A lance insertion step of inserting the lance through the blast furnace blast furnace, a measurement step of measuring the load generated by the insertion resistance of the lance and the insertion length of the lance in the lance insertion step, and storing the data obtained through the measurement step And a diagnostic step of diagnosing the state of coke using the data stored in the data storing step. The method of claim 2, The blast furnace core condition diagnostic method, characterized in that the diagnosing the dense filling zone when the insertion speed is 0.2m / s or less when the lance is inserted in the diagnostic step.