KR101065843B1 - system estimate pre-reduce wind in shaft furnace - Google Patents

Abstract

The present invention provides a system for allowing a manager to predict, determine, and execute a time point at which blast furnaces are required during operation of a blast furnace, comprising: a data input step of a manager inputting a blast blast prediction condition; A renew request step of time-checking with a timer and periodically instructing a renewal of a wind drop prediction condition by an administrator; A data collection step of collecting the wind prediction data of the manager and periodically requesting data update; A determination step of determining a wind drop prediction according to the collected data; A logic step of calculating a wind prediction condition based on the data; A range recognition step of judging whether the calculated value is a wind drop prediction range, and if the prediction range is reached, an alarm step is passed; An alarm step of alerting the cab by the signal of the range recognition step; And displaying an alarm banner to an administrator monitor according to the signal of the range recognizing step. A calculating step of calculating an amount of air drift based on the collected data; A check step of checking the pre-injection sensation prediction index; Performing a wind blowing with the finally determined data; It is composed of a blast furnace blast prediction system that aims for stable operation of the blast furnace.

Blast furnace control, blast furnace control, hot air reduction, air blast, blast furnace control prediction,

Description

System estimate pre-reduce wind in shaft furnace}

1 is a flow chart showing a control system according to the present invention.

2 is a diagram showing a list of items displayed on a monitor of a central controller according to the present invention;

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

20: Wind pressure item 30: △ P item

40: Lower K item 50: Body pressure item

60: skin flow item 70: wind pressure deviation item

80: Noche Stave Temperature Items

The present invention relates to a blast furnace blast prediction system that can notify the manager in advance of the point of need for blast blast among the factors that inhibit the productivity of the blast furnace in order to promote stable operation of the blast furnace equipment.

The blast furnace is a furnace for producing pig iron, the schematic structure of which consists of a cylindrical body of a refractory body and a hot stove. Iron ore, limestone and coke, which are the raw materials of steel, are charged in order to form layers, and when the coke is burned by supplying high temperature hot air to the lower part of the furnace, the inside of the blast furnace becomes hot and the reduction of iron oxide by carbon monoxide or carbon is prevented. Happens. In iron ore, in addition to iron oxide, unnecessary components such as silica are mixed, but this is removed by reaction of calcium carbonate in limestone by thermal decomposition to release carbon dioxide gas and remaining calcium oxide.

Iron produced in blast furnaces is usually pig iron containing about 4% or more carbon.

In order to improve the production efficiency of the blast furnace and the quality of pig iron, a hot hot air must be supplied, which is generated and supplied from the hot stove installed next to the blast furnace.

The reason why the hot stove is installed next to the blast furnace is that the efficiency can be improved by preheating the hot stove with hot gas generated from the blast furnace.

The productivity of the blast furnace is evaluated by coke ratio. This is measured by the tonnage of coke needed to make one tonne of pig iron, and in recent years it has made a leap below 0.5 as a result of technological advances.

The reason for reducing the coke in this way is that the high temperature blowing was possible by the hot stove.

Therefore, the supply management of the hot air in the operation of the blast furnace is an important item to determine the productivity.

Conventionally, when looking at a route through which hot air is blown in a blast furnace, the air blown in from the outside is preheated to a temperature of about 300 ° C. by the generated gas of the blast furnace, and is heated up to 1200 ° C. via a hot blast furnace by a blower, and then passes through the hot air main building. It is fed into the furnace through the bottom of the blast furnace through 36 blower pipes and vents, and it dissolves and burns the ore and coke to pass through the charge layer while generating a reduction reaction, and finally through the upper part of the furnace while preheating the charge. I am supposed to go out.

The exiting gas is blast furnace gas, which is stored in the gas holder again via a downcomer and is recycled as a fuel used in steel mills.

In the blast furnace of the stave cooling method, which is one of the blast furnace cooling methods, there is a structural problem with a lot of heat dissipated through the blast furnace body, and the productivity is lower than that of the cooling method in which the furnace body temperature depends on the cooling panel.

In particular, the temperature fluctuation of the furnace is extremely severe, and the yellowing instability often occurs.

The unstable condition of the furnace is different depending on the cause of treatment, but it is usually caused by the wind pressure inside the furnace, the change of the furnace temperature, the increase of the pressure inside the furnace, the excessive increase of the heat rod, etc. Stabilize the aging.

At present, the above-mentioned sensation treatment is left to the manager's judgment in the central control room, but the criteria for sensation are set as follows.

1. Reduce the wind pressure inside the blast furnace due to the rise of the low ship level and the deterioration of the gas flow in the furnace.

2. If the furnace temperature fluctuates and at the same time the pressure in each furnace direction fluctuates, gas drift occurs in the furnace.

3. Carry out when △ P rises and L.K rises due to the pressure increase in the furnace.

4. When the gas flow around the furnace is developed, the airflow is excessively increased.                         

As described above, the damping treatment depending on the judgment of the manager is not uniform in terms of trend shape and condition of each operation index and suitability of proper damping method according to the situation.

For this reason, the manager's sensation processing time is different, and the situation is worse. This is because the individual's tastes and personality differences are the effects, so each individual's judgment on the sensation of stimulation is inevitably varied.

Preliminary forecasting is important, and if you miss the point, it is likely to lead to a loss of opportunity that will make it difficult to cope with the large-scale winds.

Accordingly, the present invention provides a blast blast prediction system for the blast furnace blast furnace management by creating a requirement that the manager can reliably predict the sensation in the management of the aging in the stave-cooled blast furnace, so as not to cause problems between the blast period by the manager. The purpose is to provide.

According to the present invention, as the system instructs, the manager must periodically check the items corresponding to the requirements for the reduction of wind pressure, so that it is possible to determine whether or not the reduction of wind pressure is to be carried out in advance, thereby improving productivity by stabilizing the yellowing. We can plan.

The present invention to achieve the above object,                     

In the central control system to control the operation of the blast furnace,

A data input step of the manager inputting the blast blast prediction condition;

A renew request step of time-checking with a timer and periodically instructing a renewal of a wind drop prediction condition by an administrator;

A data collection step of collecting the wind prediction data of the manager and periodically requesting data update;

A determination step of determining a wind drop prediction according to the collected data;

A logic step of calculating a wind prediction condition based on the data;

A range recognition step of judging whether the calculated value is a wind drop prediction range, and if the prediction range is reached, an alarm step is passed;

An alarm step of alerting the cab by the signal of the range recognition step; And

A display step of presenting an alarm banner to an administrator monitor according to the signal of the range recognizing step;

A calculating step of calculating an amount of air drift based on the collected data;

A check step of checking the pre-injection sensation prediction index;

Performing a wind blowing with the finally determined data;

It consists of.

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

The present invention includes a control system such as the flow chart shown in FIG.

That is, in the data input step 100, the manager inputs a predifference prediction condition based on the operation state of the currently monitored blast furnace.

The data input of the signal is instructed by the update request step 210, which is time checked by a timer, to periodically request input update of the wind drop prediction condition by the manager in, for example, 10 minutes or the like.

The data collection step 110 periodically collects the wind prediction data of the manager, and periodically transmits a message requesting data update to the monitor of the manager.

The determination step 120 determines whether the wind drop prediction is consistent with the required condition according to the collected data. If the damping prediction is satisfied, the logic step 130 calculates the damping prediction condition based on the transmitted data.

In the range recognition step 140, the calculated value compares and determines whether it is within the wind shock prediction range, and if the prediction range is reached, goes to the next alarm step 150, and if it is outside the prediction range, the operation proceeds to the furnace operation step 200.

The alarm step 150 alerts the cab according to the instruction of the range recognition step 140. On the other hand, the signal of the range recognition step 140 is also sent to the display step 16 so that the alert banner is displayed to the manager monitor.

After the alarm is issued in the alarm step 150, the data necessary for the reduction of wind is calculated in the calculation step 17.

The calculated damping data is compared with the pre-injection prediction operation index previously input in the checking step 180 and finally determined.

The final determined data is implemented by reflecting the sensation in the implementation step 190.                     

The above-described sensation is carried out at an appropriate amount of air volume at an early stage when the various brittleness operation indexes fluctuate, and it is important to predict and reduce it in advance to prevent the deterioration caused by deodorization.

In the above-described sensation prediction method of the present invention, the sensation prediction operation index is easily displayed on the monitor of the manager.

That is, as shown in Figure 2 wind pressure 20, ΔP (30), lower K (40), furnace body pressure (50), skin flow (60), wind pressure deviation (70), furnace body stave temperature (80) 7 items are selected to be centrally managed so that the current value is always displayed on the screen.

All items are displayed in a color distinguished from other parts so as to stand out, and the upper limit of the wind pressure 20 must be input by the administrator.

In addition, when the upper limit value is reached, the neck part 150 and the display step 160 are triggered and alarmed, and the administrator must input the alarm upper and lower limit values every 10 minutes, and the difference between the wind pressure and the current wind pressure 10 minutes before If the fall value range, the alarm step 150 is triggered.

In the case of DELTA P 30, the output is output in the same prominent colored letters. The upper limit value of DELTA P 30 is directly input by the administrator. When the upper limit value is reached, the alarm step 150 is triggered.

The lower K 40 is also configured in the same manner as the ΔP 30, and in the case of the furnace pressure 50, the operator raises the alarm rise value over 10 minutes, so that the difference between the furnace pressure and the current furnace pressure 10 minutes ago is the alarm rise value. Alert stage 150 is triggered upon reaching.                     

In the case of the skin flow 60, the operator is configured to input a new alarm up / down value for 10 minutes, and when the temperature difference between the skin flow 60 and the current skin flow 60 reaches 10 minutes before the alarm up / down value, Alert step 150 is triggered.

The furnace stave temperature 80 is configured to set the alarm up and down values for the operator over 10 minutes and allow the alarm step 150 to be triggered in that range.

In addition, the operation index of the seven items may be used as a standard for general operation so that the same pattern can be used.

1) Set upper limit of alarm for dropping by operation index

Wind pressure: 4350 g / ㎠

△ P: 1.75

L.K: 1.90

2) Setting the alarm range for the wind drop by shape of operation index

Wind pressure: Up and down 5 minutes ago ± 100 g / ㎠

△ P: Up from 10 minutes ago +0.15

L.K: Up from 10 minutes ago +0.15

Body pressure gauge (SP6 ~ 12 steps): up and down 10 minutes ago ± 200 g / ㎠

Skin flow: Rise and fall 10 minutes ago + 50 ℃

BP-SD: Up from 10 minutes ago + 20 ℃

Noche SB5 stage: Up from 10 minutes ago + 50 ℃

According to the present invention, if any one of the seven items reaches the 10 minutes ago contrast alarm range setting value by setting the upper limit value and the rising / falling alarm for pre-sensitizing, the emergency alarm sounds to the operation alarm panel, and on the general monitoring screen for operation A banner is displayed by displaying the "Wind Prediction" to display the text, and the color of the text is blinking by colored text such as red. At this time, if the administrator clicks the "Wind Prediction" banner, the screen of the wind prediction system opens and an alarm is triggered. The num- ber of the corresponding fishing index turns red to indicate a discernible indication.

By doing so, the system of the present invention enhances the monitoring management through the monitor of the manager, and alerts each time the condition is met so that there is no sensation factor that can be overlooked, and manages the manager periodically by requesting data updates. It can dispel the fear of neglect, giving you the opportunity to judge whether or not a sensation has been carried out.

As described above, the present invention, in managing the blast furnace of the stave cooling method, by constructing a system for the operator to update the upper, lower limit or alarm phase, the falling value of the seven major items of the wind drop prediction in a fixed time, The operator does not have to keep an eye on the monitor, and the main management system easily identifies the banner of the item on the operator's monitor when the fluctuation of the seven index items occurs. By switching to red blinking as much as possible, it is impossible to overlook the opportunity for the worker to determine whether or not the wind is carried out, and accordingly, the following advantages can be obtained.                     

1. It is easy to prevent prediction due to pre-prediction sensation and to establish proper method of perception according to various operation index shape and situation.

2. Maintains stabilization of the old age by timely small wind and prevents loss of opportunity by timely wind.

3. It is possible to prevent excessive wind volume increase after stabilization and to stabilize the furnace body heat load prematurely.

Claims (1)

In the central control system to control the operation of the blast furnace, A data input step of the manager inputting the blast blast prediction condition; A renew request step of time-checking with a timer and periodically instructing a renewal of a wind drop prediction condition by an administrator; A data collection step of collecting the wind prediction data of the manager and periodically requesting data update; A determination step of determining a wind drop prediction according to the collected data; A logic step of calculating a wind prediction condition based on the data; A range recognition step of judging whether the calculated value is a wind drop prediction range, and if the prediction range is reached, an alarm step is passed; An alarm step of alerting the cab by the signal of the range recognition step; And A display step of presenting an alarm banner to an administrator monitor according to the signal of the range recognizing step; A calculating step of calculating an amount of air drift based on the collected data; A check step of checking the pre-injection sensation prediction index; Performing a wind blowing with the finally determined data; Blast blast prediction system consisting of.

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