KR101277973B1 - Method for controlling blow energy of blast furnace - Google Patents

Abstract

The present invention is to control the blowing energy of each blowhole supplied into the blast furnace to 11000 ~ 13000kg · m / sec to maximize the gas flow distribution efficiency in the blast furnace, thereby improving the productivity of the blast furnace, extending the life of the blast furnace and the quality of the molten iron To maintain even ventilation throughout the blast furnace.

Description

Method for controlling blow energy of blast furnace

The present invention relates to a method for controlling the blowing energy of a blast furnace, and relates to a method for controlling the blowing energy of a blast furnace for smoothly controlling the blowing energy of gas flow distribution.

In general, the blast furnace is a facility for producing molten iron by melting the charged iron ore by blowing hot air through the wind hole while repeatedly charging the fuel coke and iron ore.

The blast furnace supplies not only pulverized coal but also hot air into the blast furnace, and the flow of gas is controlled.

Related prior art is domestic patent application No. 2007-0047608.

An object of the present invention is to provide a blast furnace energy control method for maximizing gas flow distribution efficiency to improve the productivity of the blast furnace.

The purpose of the present invention is to calculate the particle size reduction when the coke charged in the blast furnace is located in the end of the wind through the blowing energy supplied into the blast furnace, so that the particle size reduction is within the range to facilitate the gas flow distribution in the blast furnace. It is solved by providing a blowing energy control method of a blast furnace which controls blowing energy.

The particle size reduction amount according to the present invention is

로 계산된다.

.

(Where X is blowing energy (ton · m / sec), and Y is the amount of coke particle size reduction (mm) in the wind sphere).)

Blowing energy control method of the blast furnace according to the present invention is to control the blowing energy of each blast in 11000 ~ 13000kg · m / sec in a large blast furnace having a content of more than 5000m ³

Blowing energy control method of the blast furnace according to the present invention has the effect of maximizing the gas flow distribution efficiency in the blast furnace to improve the productivity of the blast furnace, the blast furnace life and the quality of the molten iron.

Blowing energy control method of the blast furnace according to the present invention is to maintain the entire breathability in the blast furnace to prevent accidents caused by deterioration of breathability during blast furnace operation, there is an effect to make a stable blast furnace operation.

1 is a block diagram showing a blowing energy control method of the blast furnace according to the present invention.
Figure 2 is a graph showing the amount of coke particle size decrease according to the blowing energy amount in the blowing energy control method of the blast furnace according to the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The blowing energy control method of the blast furnace according to the present invention calculates the particle diameter reduction amount when the coke charged in the blast furnace is located at the end of the blowing through the blowing energy, and controls the blowing energy of each tuyere according to the particle diameter reduction amount.

The blowing energy control method of the blast furnace according to the present invention includes a particle size reduction amount estimating step (100) for calculating the particle size reduction amount when the coke charged in the blast furnace with the blowing energy flowing into each tuyere;

The blowing energy control step 200 to control the blowing energy of each tuyere supplied into the blast furnace after the particle size reduction amount prediction step 100 to adjust the particle size reduction amount of coke within a predetermined range to control the blowing energy.

The blowing energy is a total amount of hot wind energy supplied into the blast furnace blast furnace, and when the blowing energy increases, the distribution of gas flows in the blast furnace increases linearly to the core, but the size of the wind blowing zone in the blast furnace is measured. Examination of the data shows that if there is a critical point, gas flow distribution deteriorates if the blowing energy exceeds the critical point.

For reference, the hot blast furnace of the blast furnace is largely composed of a heat storage chamber, a combustion chamber, a mixed cooling chamber, and a plurality of hot blast furnaces per blast furnace is used because the hot air is obtained by alternately repeating combustion-atmosphere-blowing.

The hot stove burns the combustion gases (BFG, COG) and air in the combustion chamber and raises it to about 1250 ° C. The hot stove accumulates heat in a checker (not shown) arranged inside the heat storage chamber. As the cold air introduced into the combustion chamber is supplied to the combustion chamber through the heat-generated checker, the cold air takes the heat of the checker into a hot air, and the hot air passes through the combustion chamber and is supplied to the blast furnace through the mixed air chamber through the hot air pipe.

In addition, the coke charged into the blast furnace is reduced in size and reduced in strength due to the physical causes of friction between the chemical reaction and the charged matter in the blast furnace. The differentiation and deterioration of the coke in the blast furnace will have a direct effect on the aeration and liquid permeability described above, and will interfere with stable operation and smooth production.

For this reason, the change in the size of coke in the blast furnace, that is, the coke particle size, acts as an important factor in the blast furnace operation, and therefore, it is very important to measure or predict the change in the coke particle size according to the operation change.

The particle size reduction amount prediction step 100 predicts the particle size reduction amount of the coke at the end of the blast furnace according to Equation 1 below.

Equation 1 may be applied to a large blast furnace having a content of 5000m ³ or more, it is preferable to be applied to a large blast furnace having a content of 5250m ³ .

[Equation 1]

X: Blowing energy (tonm / sec)

Y: Coke particle size reduction amount in the wind sphere (mm)

Equation 1 is to extract the coke in the blast furnace during the operation of a large blast furnace having a content of 5250m ³ and to compare with the coke particle size at the time of the first charging and repeated process to derive a quadratic function formula.

The particle size reduction predicting step 100 predicts the particle size reduction of the coke by the amount of blowing energy supplied into the blast furnace.

2 is a quadratic function graph of Equation 1, and it can be seen that the change in the coke particle size decrease in the wind blower end as the blowing energy increases.

Referring to FIG. 2, it can be seen that the amount of coke particle size decrease Y in the wind sphere gradually decreases and then increases again as the blowing energy increases.

If the particle size reduction of the coke is large, air permeability is deteriorated at the end of the air vent, so that the gas flow distribution is uneven. Therefore, it is preferable to adjust the particle size reduction of the coke to a preset range of more than 0 and 32.5 mm or less. Since the coke particle size reduction is difficult to control below 31mm, it is adjusted to the preset range exceeding 31mm and below 32.5mm.

In the blowing energy control step 200, in order to control the amount of coke particle diameter reduction at the wind blowing end to 32.5 mm or less, it is preferable to control the blowing energy of each blowing hole at 11000 to 13000 kg · m / sec. You can check it.

In addition, the blowing energy WE is calculated by Equation 2 below.

&Quot; (2) "

WE: Blowing energy (kgm / sec)

VB: Air flow rate (Nm ³ / min)

O ₂ : oxygen enrichment (Nm ³ / min)

U _OT : Wind ball flow velocity (m / sec)

W _H2O : Humidity (g / Nm ³ )

TU: Feng Gusu

9.8: acceleration of gravity (m / sec ² )

Ek (kinetic energy) = 1/2 mv ² utilization

1.288 = 0.21 * 32 / 22.4 + 0.79 * 28 / 22.4 (hot air volume to mass conversion)

1.43 = 32 / 22.4 (oxygen enrichment volume → mass conversion)

Blowing mass = hot air term + oxygen enrichment term + humidity term

Unit Comparison: kgm / sec * (m / sec) ² / m / sec ²

Since the blowing energy supplied into the blast furnace is most affected by the wind bulb flow velocity, as confirmed in Equation 2, it can be controlled by adjusting the wind bulb flow velocity.

Punggujeon flow rate refers to the flow rate of the hot air just before flowing into the blast furnace through the windball.

In addition, the air flow rate can be controlled by adjusting the diameter of the hot air pipe for supplying hot air into the blast furnace, it can be controlled by adjusting the opening and closing amount of the pipe of the hot air pipe.

That is, the blowing energy control method of the blast furnace according to the present invention by controlling the blowing energy supplied into the blast furnace as described above by controlling the particle size reduction of the coke in the blast furnace to ensure the air permeability in the blast furnace, even breathability throughout the blast furnace To have.

The blowing energy control method of the blast furnace according to the present invention maximizes the gas flow distribution efficiency in the blast furnace to improve the productivity of the blast furnace, extending the life of the blast furnace and the quality of the molten iron.

Blowing energy control method of the blast furnace according to the present invention to maintain the entire ventilation in the blast furnace evenly to prevent the occurrence of accidents due to deterioration of breathability during blast furnace operation, and to make stable blast furnace operation.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention, which is understood to be included in the configuration of the present invention.

100: particle size reduction amount prediction step 200: blowing energy control step

Claims (3)

delete The blowing energy supplied into the blast furnace calculates the particle size reduction when the coke charged in the blast furnace is located at the end of the blast furnace, and controls the blowing energy so that the particle size reduction is within a range that facilitates the gas flow distribution in the blast furnace.
The particle size reduction amount is expressed by equation

Blowing energy control method of the blast furnace, characterized in that calculated as.
(Where X is blowing energy (ton · m / sec), and Y is the amount of coke particle size reduction (mm) in the wind sphere).) The method according to claim 2,
A blowing energy control method for a blast furnace, characterized by controlling the blowing energy of each tuyere at 11000 to 13000 kg · m / sec in a large blast furnace having a capacity of 5000 m ³ or more.

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