KR20000014618A - Process for side charging of bel-ras blast furnace - Google Patents

Abstract

PURPOSE: A process for side charging of belless blast furnace is maintaining furnace reed of normal operation state with other one way charging hopper in case of unusing one in charging hopper. CONSTITUTION: A process for a side charging of belless blast furnace to improve blast furnace operation efficiency by maximizing productive quantity of molten iron in the state of a side charging mode consist of converting to a side charging mode to use one way charging hopper by controlling electric signal controller, sending to charge coke 2 badge to 1 charge first and to charge small ore 1 badge first and large ore 2 badge in last gradually, discharging charging rate of coke later than charging rate of small ore and large ore by controlling lower real valve, charging coke to middle site of furnace radius from little distance site at furnace wall part and charging small ore and large ore to little over site of middle site of furnace radius from furnace wall, returning to normal material charging mode in rebuilding charging hopper after maintaining constant period.

Description

How to load the bell-lathe blast furnace on one side

The present invention relates to a method for charging fuel and raw materials in a bell-blast furnace, and more particularly, to a one-side charging method for charging fuel and raw materials with only one charging hopper of a bell-las blast furnace.

The bell-lathe blast furnace is used for blast furnace process because it is easy to control the distribution of charges and the equipment cost is low. The order of loading fuel and raw materials into these bell-blast furnaces is generally to load coke, allele ore, central coke and small ore in sequence.

1, the fuel and raw material charging device of the bell-lathe blast furnace will be described schematically.

The bell-lathe blast furnace 10 is equipped with two charging hoppers 11 and 13 for charging fuel and raw materials, and a turning chute 15 is installed below the charging hoppers 11 and 13 to turn the chute chute. Turns to charge fuel and raw materials.

Above and below the charging hoppers (11, 13) of the bell-lathe blast furnace are equipped with seal valves (15, 17) for regulating the pressure in the hopper and regulating the charging of the charges. There are many valves (not shown) for controlling the back.

On the other hand, the coke and iron ore to be charged to the bell-lathe blast furnace is waiting in the basis weight in the conventional five basis weight hoppers 21, 22, 23, 24, 25 installed on the ground. In this case, the coke 26 stores the coke selected through a particle size separator (not shown) in a fuel storage tank (not shown) in the first and second basis weight hoppers 21 and 22. The iron ore is sintered in a sintering furnace (not shown) and then crushed to separate the allele 27 and the small ore 28, and then the allele 27 is transferred to the third and fourth basis weight hoppers 23 and 24. The small particles 28 are respectively stored in the fifth basis weight hopper 25.

The coke 26 and the iron ore 27 and 28 waiting in each basis weight hopper are sequentially transferred to the laborer through the conveyor belt 29, and the transferred charges, that is, the coke 26 and the iron ore 27 and 28 are After arriving at the head chute 18, the transfer chute 19 is installed in the middle of two charging hoppers 11 and 13, and is stored in the charging hoppers 11 and 13.

When the raw material charging device of the bell-lathe blast furnace 10 operates normally, the two charging hoppers 11 and 13 are used to evenly load the contents into the blast furnace.

In order to charge the charges stored in the charging hoppers 11 and 13 into the blast furnace 10, the upper seal valves 14 and 15 of the charging hoppers 11 and 13 are closed and gas is introduced into the charging hoppers 11 and 13. The pressure in the charging hoppers 11 and 13 is kept higher than the pressure in the blast furnace 10.

In this state, the lower seal valves 16 and 17 are opened at a predetermined angle, and the turning chute 15 is pivoted so as to be divided into the furnace wall 20 and to the furnace center.

At this time, the inclination of the turning chute 15 is controlled to be divided into eleven equal parts concentrically from the furnace wall 20 to the furnace center so that the charges can be evenly charged in the furnace. The first part is called a notch, and the furnace wall is 1 notch and the center of the furnace is 11 notches.

In the normal operating conditions, the amount of charge and the order of charging of the charge into the furnace are as follows.

First, the coke 26 stored in the first and second basis weight hoppers 21 and 22 is charged with 1 charge from the furnace wall (2 notches) to the middle side (5 notches) of the furnace radius, and the third And charge the opposing light (27, large ore) stored in the fourth basis weight hopper (23, 24) from the middle (4 notch) of the furnace radius to the core side (8 notch) with one charge, and then the first basis weight hopper (21). ) After charging the coke 1/2 (26, center coke) stored in the core to the core side (11 notches), and finally the small particle (28, small ore) stored in the fifth basis hopper 25 from the furnace wall (2 notches) Charges into the middle of the furnace radius (5 notches). In this case, the term "primary" means the quantity of charges charged once in a blast furnace.

Charging the coke 26 and the iron ore (27,28) in the same amount and order is called 1 cycle, and in the case of normal blast furnace operation, the charge is continuously loaded into the blast furnace by repeating about 130 to 140 cycles per day.

During normal operation of the blast furnace, one of the charging hoppers 11 and 13 may not be available due to a failure of the valve or control system controlling the raw material charging device.

When this situation occurs, only one charging hopper (11 or 13) is used to perform a series of raw material loading process in the same order as in the normal operation mode by hand.

However, if the charging process is carried out depending on the manual work, it is difficult to maintain high volum operation because it is necessary to use the operation buttons from the basic weighing process of the charge to the charging process of the charging hopper and the final charging process. The reality is that the hopper is being repaired quickly while operating at low airflow conditions with low airflow.

As such, when the operation is carried out in a low wind volume state with one charging hopper, even when repairing a broken charging hopper, it takes a lot of time to recover the deteriorated aging to normal operation. Therefore, due to the deterioration of the blast furnace, the operation rate of the blast furnace is lowered, the production of the molten iron is reduced, the production cost rises, and a number of side problems occur.

The present invention has been invented to solve the above problems, an object of the present invention is to provide a bell-lases that can maintain the normal operation of the rust even with the other one of the charging hopper available when one of the charging hopper is not available It is to provide a unilateral charging method of the blast furnace.

1 is a schematic diagram of a blast furnace and raw material charging device to which the present invention is applied.

2 is a flowchart for carrying out the one-side charging method according to the present invention.

In order to realize the above object, the present invention, in the step of charging the charges using only one charging hopper of the bell-lathe blast furnace,

Controlling the electric signal controller to switch to the one-side charging mode to use only one charging hopper;

A charging sequence of the charges is sequentially charged so that two coke sheets are first charged, and the remaining ones are charged with one small grain of medium first and two of the two opposed minerals;

Controlling the lower seal valve so that the charging speed of the coke is discharged relatively later than the charging speed of the small and allied light;

Coke charged by controlling the inclination of the turning chute is charged from the position slightly away from the furnace wall to the middle position of the furnace radius and the small particle and the opposing light evenly charged from the furnace wall to a position slightly beyond the middle position of the furnace radius;

And after maintaining the charging sequence for a certain period of time, if the broken hopper is repaired provides a one-way charging method of the bell-las blast furnace consisting of returning to the normal raw material charging mode.

In the present invention, unlike the normal operation state, the charging sequence of the charge of the charge is to charge the coke first charge, and to charge the continuous charge as the primary charge by adding the opposing light to the small particles to reduce the interval between each charge.

In addition, in the present invention, unlike the normal operating state, charging the small particle first and then charging the allele later charges the small particle near the first notch, which is the part of the furnace wall, to prevent the temperature of the furnace wall from rising and the furnace gas flow. To form in the center direction. This makes it possible to maintain the existing yellowing which is charged and maintained in the order of the normal charging pattern coke, allele, central coke and small particle in the unilateral charging mode.

On the other hand, controlling the charging speed of the raw material control valve of the charging hopper so that the charging speed of the coke is charged relatively later than the charging speed of the small particles and alleles charged later to maintain the load balance of each charge.

And not charging the core coke charged in normal operation state is to maintain the good ventilation inside a furnace.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment in which the present invention described above may be specifically described will be described with reference to the accompanying drawings.

The present invention relates to charging the charges by using the other charging hopper when one of the two charging hopper of the bell-blast blast furnace is not operated, the blast furnace installation is not different compared to the general bell-las blast furnace.

Therefore, the present invention will be described with reference to FIG. 1, which shows a general bell-laser blast furnace, and FIG. 2, which shows a control flow of the present invention.

Hereinafter, for convenience of description, only the right charging hopper 13 in FIG. 1 may be used.

First, when one of the two charging hoppers 11 and 13 cannot be operated due to a failure of any of the auxiliary facilities of the raw material charging device in the state in which the blast furnace 10 is normally operated (S1), the driver uses The one-side charging mode is selected to execute the charging process using only the remaining charging hopper 13 (S2).

When the one-side charging mode is selected, the electric signal controller reads the setting value for executing the preset one-side charging and resets the setting value for executing the charging.

The setting values of the single-sided charging mode are as follows.

First, the raw material loading matrix using only one charging hopper 13 has coke and allied light so that two batches of coke are transported to the first cell, and then two mediums of coke and one of the small particles are transferred to the first cell. Set the location to save small particles. Herein, 1 medium refers to the amount of charged matter that is once weighed into the basis weight hopper 21.

Then, the control angle of the lower seal valve 17 is set so that the charging speed of the coke 26 is charged relatively later than the charging speeds of the small particle 28 and the opposing light 27 which are next charged. The actual set control angle is larger when small and allied light are emitted than when coke is emitted. On the other hand, the number of revolutions of the turning chute 15 at each notch is appropriately set in the range of 1 to 4 revolutions in consideration of the characteristics of the furnace.

In addition, the position where the charged coke and iron ore are charged in the furnace is charged from the position slightly away from the furnace wall (2 notches) to the middle position of the furnace radius (5 notches) in the case of coke 26, and is opposed to the small particles 28 The light 27 sets the inclination of the turning chute 15 so as to be evenly charged from the furnace wall (1 notch) to a position slightly above the intermediate position of the furnace radius (7 notches).

When the electric signal controller reads the one-side charging mode with the set value as described above, it immediately changes from the normal charging mode to the one-side charging mode (S4).

When switching to the one-side charging mode, the electric signal controller first checks whether the charge reaches the charging reference line by the furnace charge level measuring device 30, and then, when the charge reaches the charging reference line (S5), the coke basis weight hopper 21, Opening the gates 31 and 32 of 22) instructs the discharged coke to be discharged to the operating conveyor belt (S6).

The first amount of coke discharged from the basis weight hopper is transferred to the conveyor belt (S7), stored in the charging hopper 13 operable through the upper seal valve (S8), and then opened at the control angle set through the charging process. After discharging through the seal valve, the coke is sequentially charged from 2 notches to 5 notches by the turning chute which is inclined at the set slope and rotates at the set rotation speed (S9 and S10).

On the other hand, when the electric signal controller receives a signal indicating that the coke is being transferred by the conveyor belt from the charge loading detector 37, the electric signal controller opens the gate 36 of the small particle basis weight hopper 25 to first distribute the small particle size to the conveyor belt. Instructs to load (S11), and after the small particle light is completely loaded, the gates 34 and 35 of the allergic light basis hoppers 23 and 24 are sequentially opened to load two medium amounts of allergic light onto the conveyor belt ( S12).

The primary amount of small and allied light discharged from the basis weight hoppers (25, 23, 24) is transferred to the conveyor belt (S13) and stored in the right charging hopper through the upper seal valve (S14) than when the coke is discharged. After being discharged to the lower seal valve opened at a large angle, it is charged sequentially from 1 notch to 7 notches by the swivel hopper which is inclined at the set slope and rotates at the set speed (S15, S16). As the iron ore is charged in this order, the small ore particles are charged to the furnace wall portion, and the opposing minerals are evenly charged to the furnace core portion.

One cycle for charging the charge is completed in the order as described above. After that, the charging cycle using the one-side charging mode is repeated until the charging hopper 11 which is not operated is fully operated.

When the non-operating charging hopper 11 starts to operate normally again, the electric signal controller returns from the one-side charging mode to the normal charging mode (S1).

When the coke and iron ore is charged using one charging hopper in the same way as above, the charging can be carried out without abruptly lowering the air volume, so that the broken charging hopper can be repaired while maintaining the aging under the normal charging mode. In the charging mode, blast furnace workability can be improved by maximizing the yield of molten iron.

Claims (1)

In the process of charging the charges using only one charging hopper of the bell-lathe blast furnace, Controlling the electric signal controller to switch to the one-side charging mode to use only one charging hopper; A charging sequence of the charges is sequentially carried out so that two cokes of coke are first charged, and the remaining one is charged with one small grain of medium first and then two of the alleles are charged later; Controlling the lower seal valve so that the charging speed of the coke is discharged relatively later than the charging speed of the small and allied light; Coke, which is charged by controlling the slope and the number of turns of the turning chute, is charged from the position slightly away from the furnace wall to the middle position of the furnace radius, and small and opposing light is evenly charged from the furnace wall to a position slightly above the middle position of the furnace radius. step; And returning to the normal raw material charging mode when the broken hopper is repaired after maintaining the charging sequence for a predetermined period of time.