KR20010011971A - Apparatus and method for controlling pressure change on charging hot stove with wind - Google Patents

Abstract

PURPOSE: An apparatus for controlling pressure variation during blasting in a hot stove and a method thereof are provided to make a source of blowing air pressure, i.e., cooling air pressure uniform and gas flow in a blast furnace constant by detecting a cooling air flow rate at an even pressure, a cooling air pressure and a blower pressure, calculating and comparing each variations to judge whether or not a normal blasting should be proceeded, and accurately controlling an even pressure control valve. CONSTITUTION: A cooling air pressure is set, and air blowing and even pressure instructions are input in an input part as blowing is being processed after combustion. A pressure in a blast furnace is detected in a detecting part(6) from a blower pressure gauge as detecting a cooling air flow rate from a cooling air flow rate gauge and a cooling air pressure from a cooling air pressure gauge. An operation part(11) controls a pressure variation or calculates a warning value from a warning value calculation part(11-4) by calculating control values of a uniform pressure control valve according to the cooling air pressure variation. A memory part monitors continuously data input into the operation part(11). The proceeding conditions of the operation part(11) can be monitored by an operator in an operation monitor part. An operating part controls a uniform pressure valve for minimizing the pressure variation.

Description

Control device and method of pressure change during hot blast furnace {APPARATUS AND METHOD FOR CONTROLLING PRESSURE CHANGE ON CHARGING HOT STOVE WITH WIND}

The present invention relates to an apparatus and a method for controlling pressure change during charging of a hot blast furnace, in particular, by detecting cold air flow rate, cold wind pressure, and blast furnace pressure during equal pressure, and calculating and comparing the respective amounts of change to determine whether the normal blast is progressing, and judgment data. On the basis of precise control of the equalization control valve according to the change of cold wind pressure when judged to will be.

In general, as shown in FIG. 1, the hot blast furnace 3 of the blast furnace 1 accumulates heat through combustion and blows the hot blast required by the blast furnace through blowing, and at this time, combustion and blowing of the hot blast furnace periodically The two functions are replaced and operated. In particular, the blow air for the equalization (the equal pressure means that the hot air furnace is made at atmospheric pressure at the time of combustion. The cold wind pressure is required to reduce the cold air pressure and the blowing pressure, and cause the smoke and collapse of the heat storage chamber and the combustion chamber to increase a certain amount of cold wind flow to fill the air flow with the blowing pressure. Independent blower equipment (2) and blast furnace hot stove equipment are installed in the city, resulting in a pressure change caused by cold air flow control, which causes a change in the blower pressure, which may disturb the distribution of the contents of the furnace. There is a risk of brittleness (a phenomenon in which the contents collapse and the pressure on the furnace) is caused by changes in the gas flow.

And, in the related art, the equalization method at the time of blowing is performed as shown in FIG. 2, and if the blowing command is output after the combustion process of the hot stove is completed, the combustion valves (not shown) are all closed and the equalization control is performed. The start of blowing of the valve 3-2 and the blower 2 is performed simultaneously.

At this time, the air blow and the pressure equalizing control valve (3-4, 3-2) is controlled by time, so that the pressure of the cold wind due to the wrong progress or failure of each independent equipment is inevitable.

On the other hand, in the conventional blow pressure equalizing method, if a failure occurs in the blower during the equalizing sequence according to the blow, the equalizing control valve 3-2 continues to increase according to the time base, causing the cold wind pressure to drop rapidly. When normal air is blown out, cold air pressure will rise rapidly when opening operation is impossible due to breakdown of pressure control valve.

In addition, when the pressure of the blower 2 reaches the cold wind pressure range during the progress of the pressure equalizing sequence according to the blowing, the pressure equalizing is completed by the pressure equalization completion signal.

In addition, when the normal pressure equalizing sequence is progressed, the pressure equalizing control valve 3-2 controls the time base to prevent pressure control according to the change in cold wind pressure, resulting in a change in pressure, resulting in a problem. The blast furnace load distribution is disturbed due to the change of the blowing pressure, and the gas flow in the blast furnace is not constant.

The present invention has been made to solve the above problems, it detects the cold air flow rate, the cold wind pressure, the blower pressure at the time of equalization, and calculates and compares each change amount to determine whether the normal wind blowing progress, the normal judgment based on the judgment data Pressure control device during the hot air blast to ensure stable operation by uniformly controlling the cold air pressure and the constant gas flow in the blast furnace by precisely controlling the equal pressure control valve. And to provide a method.

1 is a configuration diagram showing a blast furnace hot stove facility.

Figure 2 is a flow chart showing a pressure change control method during the charging of the hot stove according to the prior art.

Figure 3 is a block diagram showing a pressure change control device during the hot air in accordance with the present invention;

Figure 4 is a flow chart showing a pressure change control method when the hot air in accordance with the present invention.

<Explanation of symbols for main parts of drawing>

DESCRIPTION OF SYMBOLS 1: Blast furnace 2: Blower 3: Hot air blower 3-1: Uniform pressure valve 3-2: Uniform pressure control valve 3-3: Cold air valve 3-4: Cold air control valve 3-6: Back pressure valve 3-7: Back pressure control valve 5: Input unit 6: Detection unit 7: Memory unit 8: Operation monitoring unit 9: Operation unit

In order to achieve the above object, the present invention provides an input unit for setting a cold wind pressure, a blow command, and a pressure equalization command while the air is blown after combustion; A detection unit for detecting the cold air flow rate from the cold air flow meter and detecting the furnace pressure from the blower pressure gauge while detecting the cold air pressure from the cold air pressure gauge; By calculating the data input from the input unit and the detection unit calculates the rate of change of the air volume and the wind pressure in the speed calculation unit, and determines whether or not the normal air blow progress by using the cold wind pressure, the change in the furnace pressure of the blower in the air blow judgment unit, An operation unit for controlling the pressure change or calculating an alarm value in the alarm value calculation unit by calculating a control value of the equalization control valve according to the cold wind pressure change in the equalization pressure shift calculation unit according to the equalization progress judgment of the impulse advancing decision unit; A memory unit for continuously monitoring data input to the operation unit; An operation monitoring unit for monitoring the progress of the operation unit by the driver; Provided is a pressure change control device during the charging of the hot blast furnace, characterized in that consisting of the operation unit for controlling the equalization valve and the pressure equalization valve to minimize the pressure change by using the values calculated by the input unit, the detection unit, the calculation unit.

In addition, the present invention comprises the steps of the blow start signal and the pressure equalization valve of the blower by the pressure equalization command is opened when the blow command is output in the operation for the progress of the blowing and the air flow, the detection unit detects the air flow rate and wind pressure and enters into the operation unit; Calculating a wind volume change rate, a wind pressure change rate, and a furnace pressure change rate in a speed calculator of the calculator; Determining whether the pressure equalization is advanced by using the calculated value of the speed calculation unit at the air blow determination unit; Calculating a control value of a pressure equalizing control valve according to a change in cold wind pressure in the pressure equalizing degree calculation unit according to the pressure equalizing judgment of the air blowing advancing unit and controlling a pressure change or calculating an alarm value at an alarm value calculating unit; After the pressure equalization control valve is opened according to the opening value calculated by the pressure equalizing degree calculation unit, the pressure equalization progresses, and when the pressure is within 200 [g / ㎠] by comparing the cold air pressure with the furnace pressure of the blower, the pressure equalization is completed and the blower ends the blower. Steps; The pressure at the time of blowing in the hot blast furnace, characterized in that if the increase in the cold wind pressure after the end of the charging pressure is controlled to open the back pressure control valve to prevent the increase in pressure, and if the pressure is less than the set pressure, the pressure equalizing control valve is closed and blowing is performed. Provides a change control method.

EMBODIMENT OF THE INVENTION The structure of this invention is demonstrated in detail with reference to attached drawing.

Figure 3 is a block diagram showing a pressure change control device during the hot air blast according to the present invention, Figure 4 is a flow chart showing a pressure change control method during the hot air blast according to the present invention.

In the pressure equalizing pressure control device according to the furnace body of the blast furnace, the input unit 5 receives the cold wind pressure setting, the blowing command, and the pressure equalizing command as an operation for advancing the air after the combustion is completed.

The detection unit 6 detects the cold air flow rate from the cold air flow meter 10-1, detects the furnace pressure from the blower pressure gauge 10-3, while detecting the cold air pressure from the cold air pressure gauge 10-2. 11).

At this time, the calculation unit 11 calculates the change rate of the air volume and the wind pressure by calculating the data input from the input unit 5 and the detection unit 6, from which it is determined whether or not the normal wind progress.

That is, the speed calculating section 11-1 calculates the change rate of the air volume and the wind pressure by the following equation.

Airflow rate change rate = [HQ-HQ '] / T

In this case, HQ is the current air volume, HQ 'represents the T super-electric wind volume, T represents the sample period.

Wind pressure change rate = [HP-HP '] / T

At this time, HP represents the current pressure, HP 'represents the T seconds ago pressure, T represents the sample period.

Inner Pressure Change Rate = [HP1-HP1 '] / T

At this time, HP1 is the current furnace pressure, HP1 'is T seconds ago furnace pressure, and T represents the sampling cycle.

When the speed calculation unit 11-1 calculates each change amount by using the above equation, the blow wind determination unit 11-2 determines whether or not the normal blow wind progress is performed by using the cold wind pressure and the furnace pressure change of the blower. It is determined based on the following Table 1.

Table 1.

division Equal Pressure Command Cold wind pressure change Blower Pressure Change Print Remarks One Yes none increase Normal course Normal sequence 2 Yes decrease increase Equalization valve closed Blowing up of blower facility 3 Yes increase decrease Chungpoong administration stop Operation stop of equal pressure valve 4 Yes increase increase Equal pressure control valve control Poor pressure detection failure of the ventilation furnace

Here, when it is determined that the normal pressure equalization progress is performed by the air blow decision unit 11-2, the pressure change is calculated by calculating the control value of the pressure equalizing control valve according to the cold wind pressure change in the pressure equalizing degree calculation unit 11-3 from the following Equation 4. Control.

Equal pressure control variable = [(△ T × ratio) + A] × △ P

At this time, ΔT × ratio is the system scan time and the valve response speed, A represents the opening degree of the valve, and ΔP represents the compensation value by the cold wind pressure change amount.

However, if it is determined that the abnormal wind pressure is advanced by the wind advancing unit 11-2, the alarm value calculating unit 11-4 calculates the alarm value.

On the other hand, the memory unit 7 continuously monitors the data input to the calculating unit 11, and the operation monitoring unit 8 enables the driver to monitor the progress state of the calculating unit 11.

In addition, the operation unit 9 performs control of the equalization valve for minimizing the air blow progress and the pressure change by using the values calculated by the input unit 5, the detection unit 6, and the operation unit 11.

Hereinafter, the operation according to the present invention will be described in detail.

In the control method of pressure change during the pressure equalization according to the furnace body of the blast furnace hot air, when the blow command is output as the operation for blowing progress, the blow start signal and the pressure equalizing valve 3-1 of the blower are opened by the pressure equalization command. The air volume and the wind pressure are detected and input to the calculating unit 11.

At this time, in order to determine whether or not normal charging is performed by using each of the input cold wind flow rate, cold wind pressure, and blower pressure, it is determined whether or not it is normal by calculating the air flow rate and the wind pressure change rate.

For example, the cold wind pressure change amount and the furnace pressure change amount of the blower are calculated and determined as follows.

Cold wind pressure change rate = {HP [g / ㎠] -HP '[g / ㎠]} / T [SEC]

= {4160 [g / cm 2]-(4020 [g / cm 2])} / 2 [SEC]

= 70 [g / cm 2] / SEC

In-house pressure change rate = {HP1 [g / ㎠]-HP1 '[g / ㎠]} / T [SEC]

= {26 [g / cm 2]-(1.2 [g / cm 2])} / 2 [SEC]

= 12.4 [g / cm 2] / SEC

For example, if the cold wind pressure change value is 25 [g / cm2] / SEC or more and the blower furnace pressure is within 0 [g / cm2] / SEC, it is judged to be equal to the equalization control valve system and the cold wind pressure change value is -25. If the pressure in the blower is less than [g / cm 2] SEC and the pressure in the blower is 25 [g / cm 2] / SEC or more, it is determined that the blower system is abnormal. Alarm is calculated by calculating alarm value in -4).

Further, in the air blowing adjudication unit 11-2, the cold air pressure change value is in the range of -25 [g / cm 2] / SEC to 25 [g / cm 2] / SEC, and the furnace pressure of the blower is 10 [g / cm 2]. If / SEC or more, it is considered normal.

Here, when it is determined that the normal pressure equalization progress is performed by the charging wind advancing part 11-2, the equalization pressure shift calculation unit 11-3 calculates the control value of the equalization control valve according to the change of the cold wind pressure.

For example, the control value of the equal pressure control valve according to the change in cold wind pressure is calculated and determined as follows.

Equalizing control valve opening value = [ΔT (0.2) × ratio (0.4)] + [A (25%)] × [ΔP (1.12)]

= 25.08 × 1.12 = 28.08%.

Then, comparing the cold air pressure and the furnace pressure of the blower, if the pressure is within 200 [g / cm 2], the pressure equalization is completed and the blower ends.

At this time, if the cold wind pressure rise after the end of the charging wind is more than the set pressure, that is, 100 [g / cm 2] or more to control the opening of the back pressure control valve (3-7) to prevent the pressure rise.

In addition, if the cold air pressure rise is normal, the pressure control valve 3-2 is closed and the air is blown to uniformize the cold air pressure, which is the basis of the blowing pressure, so that the gas flow in the blast furnace can be constant and stable operation can be performed. The present invention relates to a control method of pressure change during pressure equalization according to the furnace body of a blast furnace.

The present invention detects the cold air flow rate, cold air pressure, blower pressure at the time of equalization and calculates and compares each change amount to determine whether the normal blow is in progress to prevent the sudden change of pressure, precise control of the pressure control valve according to the cold wind pressure change As a result, the cold air pressure, which is the basis of the blowing pressure, is made uniform, thereby preventing the change of the furnace body pressure in the blast furnace hot air furnace in advance, thereby providing the effect of inducing stable operation of the gas flow in the blast furnace.

Claims (2)

After combustion, while the blowing is in progress, the input unit (5) for setting the cold air pressure setting and the blowing command, the equalizing command; A detection unit 6 for detecting the cold air flow rate from the cold air flow meter 10-1 and detecting the furnace pressure from the blower pressure gauge 10-3 while detecting the cold air pressure from the cold air pressure gauge 10-2; By calculating the data input from the input unit 5 and the detection unit 6, the speed calculating unit 11-1 calculates the rate of change of the air volume and the wind pressure, and the cold wind pressure determining unit 11-2 calculates the cold wind pressure and the air blowing path. It is judged whether or not normal blow wind is progressed by using the in-furnace pressure change, and control of the equal pressure control valve according to the cold wind pressure change in the equal pressure change degree calculation unit (11-3) according to the pressure equalizing decision of the blow wind decision unit (11-2). A calculation unit 11 for controlling a pressure change by calculating a value or calculating an alarm value in the alarm value calculating unit 11-4; A memory unit (7) for continuously monitoring data input to said calculating unit (11); An operation monitoring unit 8 capable of monitoring the progress of the operation unit 11 by the driver; Hot air, characterized in that consisting of the operating unit 9 for controlling the equalization valve and the pressure equalization valve for minimizing the pressure change by using the values calculated by the input unit 5, the detection unit 6, the calculation unit 11 Pressure change control device when the furnace is blowing. After the combustion is finished and the blow command is output in the operation for blowing progress, the blow start signal and the equalization valve 3-1 of the blower by the pressure equalization command are opened, and the detection unit 6 detects the air volume and the wind pressure to calculate the operation unit 11. Inputting to; Calculating a speed change rate, a wind pressure change rate, and a furnace pressure change rate in the speed calculator 11-1 of the calculation unit 11; Determining whether or not the pressure equalization is advanced by using the calculated value of the speed calculating unit (11-1) in the air blow determination unit (11-2); In accordance with the pressure equalization judgment of the air blowing decision unit 11-2, the pressure equalization degree calculation unit 11-3 calculates a control value of the pressure equalizing control valve according to the cold wind pressure change to control the pressure change or the alarm value calculating unit 11 Calculating an alarm value at -4); After the pressure equalization control valve 11-3 is opened and the pressure equalization proceeds according to the opening degree calculated by the pressure equalization opening degree calculation unit 11-3, 200 [g / cm 2] If it is within the step of completing the pressure equalization and blowing of the blower; When the cold wind pressure rise is higher than the set pressure after the end of the blowing air, the back pressure control valve (3-7) is opened to prevent the pressure rise, and if it is less than the set pressure, the pressure control valve (3-2) is closed and blowing is performed. Pressure change control method during the blowing of the hot stove, characterized in that.