KR101175473B1 - Method for controlling nute coke in blast furnace - Google Patents

Abstract

The present invention relates to a method for controlling the distribution of nut coke in a blast furnace, and more particularly, to a method for controlling the distribution of nut coke in a blast furnace using a semi-circular shaped top bunker. According to the present invention, the gas flow in the blast furnace is stabilized by controlling the distribution of nut coke in the blast furnace, and the air permeability is improved by distributing the nut coke in the middle part of the blast furnace, which is the most vulnerable part, to perform an efficient and economical blast furnace process. You can.

Description

Method for controlling nute coke in blast furnace}

The present invention relates to a method for controlling the distribution of nut coke in a blast furnace, and more particularly, to a method for controlling the distribution of nut coke in a blast furnace by using a semicircle-shaped road top bunker.

The blast furnace is a facility that melts iron ore to manufacture molten iron (pig iron).

In general, the blast furnace process uses raw ore and fuel coke from the furnace bunker to the center from the periphery, that is, the chute alternately from top to bottom using the chute slewing chute. The process is done by blowing with pulverized coal.

An object of the present invention is to provide a method for controlling the distribution of nut coke in a blast furnace that can stabilize the gas flow in the blast furnace and improve air permeability by controlling the distribution of charges in the blast furnace for an efficient and economical blast furnace process.

According to a feature of the present invention for achieving the above object, the present invention is to discharge the charge from the semicircle-shaped furnace bunker, and then notch fractionated using a chute in the radial direction of the blast furnace wall section from the blast furnace wall part It provides a method for controlling the distribution of nut coke in the blast furnace, characterized in that the charge is uniformly injected along.

The residence time of the charge in the semicircle-shaped furnace bunker is the shortest residence time at the outlet because the rapid downstream flow occurs along the top of the outlet of the furnace bunker, and it becomes longer as it is discharged from the adjacent portion of the outlet and separated from the outlet.

The charge is iron ore including iron ore and nut coke, and the nut coke can be positioned on the top of the iron ore in the furnace bunker.

The fractionated notch is a position where the notch number is 4, 5, 6, 7 when the bottom surface of the blast furnace is divided into 11 and the notch number at the blast furnace wall part is 1 and the notch number at the blast furnace center is 11, wherein The charge is sprayed at positions where the notch numbers are 4, 5, 6 and 7.

The present invention controls the distribution of nut coke in the blast furnace by discharging the charges from the semicircular shaped roadside bunkers and then spraying the charges in accordance with a notch that is radially fractionated from the blast furnace wall to the blast furnace center.

In this case, by controlling the distribution of nut coke in the blast furnace, the gas flow in the blast furnace is stabilized, and the distribution of nut coke in the middle portion of the blast furnace, which is the most vulnerable part, improves the air permeability, thereby enabling an efficient and economical blast furnace process.

1 is a schematic view showing a topless bunker in the form of a bellless type on the upper part of a blast furnace.
Figure 2 is a graph showing the results of the discharge by inserting a tracer (tracer) painted in seven branches in the cold road of the model.
FIG. 3 is a distribution diagram showing the distribution of the residence time of charges in the semi-circular roadside bunker according to the present invention based on the graph of FIG. 2 and the results of video shooting at the time of the experiment.
Figure 4 is a distribution diagram showing the distribution of the residence time of the charge in the Blessed-type furnace top bunker according to a comparative example of the present invention.
5 is a schematic view showing the distribution in a blast furnace of a nut coke according to Example 1 according to the present invention.

The present invention provides a method for controlling the distribution of nut coke in a blast furnace by adjusting the distribution of the charge residence time in the furnace bunker and then spraying it regularly for each notch.

Hereinafter, the present invention will be described in detail.

1 is a schematic view showing a topless bunker of a bellless type in the upper part of the blast furnace.

Referring to Figure 1, the blast furnace process includes a feeder spout (4) connected to the bottom of the hopper (3) and the hopper (3) receiving the charge from the furnace bunker (2) located on the top of the blast furnace (1) and It is connected to the feeder spout 4 and is performed with a chute 5 that is capable of rotation and angular change. In the process of generating molten iron in the blast furnace, iron ore and coke are charged by particle size from the upper part of the blast furnace, and when hot air, pulverized coal and oxygen of 1,070 to 1,250 ℃ are supplied from the lower part of the blast furnace, a reduction reaction occurs inside the blast furnace to produce molten iron.

In order to input the coke as a fuel to the blast furnace, coke ejected from a coke storage tank (not shown) is screened to a particle size of 25 to 75 mm through a coke particle size selector (not shown), and less than 25 mm selected from the coke particle size sorter. (Iii) Coke is temporarily stored in the minute coke reservoir through a lower conveyer belt. The stored minute coke is again sorted into a nut coke of 12-25 mm through a nut coke particle size selector.

The charge is transferred to the chute 5 through the hopper 3, and the chute 5 is capable of rotation and angular change, and a desired charge distribution can be obtained through control of the charge drop trajectory. It is important to understand the behavior of the charges at each location, since the dropping of charges is made continuously from the hopper 3 through the chute 5 and stacked on top of the charges. You can do

Figure 2 is a graph showing the results of the discharge by inserting a tracer (tracer) painted in seven branches in the roadside bunker.

As shown in Figure 2, put the tracer marked in red into the semi-circular roadside bunker according to the present invention, and then stack the tracers marked in green, orange, blue, yellow, black, and white sequentially, and then discharged from the semicircular roadside bunker As a result, the red tracer located at the outlet of the route bunker is located at the bottom of the semi-circular route bunker, so it is discharged the most, and it can be seen that a certain amount is discharged over time (as the sampling number increases), and green, orange, blue, yellow, and black , The white tracer was used to predict the distribution of the residence time of the charge in the semicircular road bunker.

FIG. 3 is a distribution diagram showing the distribution of the residence time of the charges in the semi-circular roadside bunker according to the present invention based on the graph of FIG. 2 and the results of video shooting at the time of the experiment.

As shown in FIG. 3, the shortest residence time of the charge was indicated as 1, and as it was 7, the retention time of the charge was increased. The semi-circular roadtop bunker 10, which is a new bellyless type, can be seen that it is discharged in a mass flow-like mass flow, unlike the bellyless type according to the comparative example of the present invention, and the outlet 11 Accordingly, it can be seen that a rapid funnel flow appears, so that the residence time of the charge at the upper portion of the outlet 11 is the shortest, and then discharged sequentially from the top, and the residence time of the charge at the wall of the furnace bunker 10 is the longest. . The arrow f shown in FIG. 3 represents the flow of the charge.

Figure 4 is a distribution diagram showing the distribution of the charge residence time in the bell-type type of the road top bunker according to a comparative example of the present invention.

As shown in FIG. 4, it can be seen that the distribution of the residence time of the charges in the furnace bunker 10 in the form of a bellless type according to a comparative example of the present invention indicates a funnel flow like a typical funnel flow, and an outlet It can be seen that the residence time of the charge in the portion (11) is the shortest, and the residence time of the charge is longest in the side wall near the outlet 11. The arrow f shown in FIG. 4 represents the flow of the charge.

That is, in the method of controlling the distribution of nut coke in the blast furnace according to the present invention, the residence time distribution of the charge in the furnace is a rapid flow downstream from the semi-circular furnace bunker along the top of the furnace bunker outlet, resulting in an outlet. The residence time is the shortest, and the residence time has a longer distribution as it is discharged from the adjacent portion of the outlet and separated from the outlet. On the other hand, the distribution of the residence time of the charges in the bell-less type of the furnace bunker according to the comparative example of the present invention is the shortest at the outlet of the furnace bunker, the longest at the wall of the furnace bunker, the funnel flow (funnel flow) ).

After generating the charge flow according to the present invention through the outlet of the furnace bunker with the above residence time distribution of the residence time distribution caused by the semi-circular furnace bunker as described above, the chute is used in the radial direction of the blast furnace wall section in the center direction of the blast furnace. By spraying it constantly along the notch.

In the method for controlling the distribution of nut coke in a blast furnace according to the present invention, by controlling the distribution position of the nut coke, the air permeability is improved and the reduction and melting of iron ore is good, so that an efficient blast furnace process can be performed.

The charge is iron ore containing iron ore and nut coke, and when the iron ore containing nut coke is located in an upper part of a semicircle-shaped furnace bunker, when the blast furnace wall part is uniformly sprayed for each notch in the center direction Since the nut coke is located in the middle part of the blast furnace, which is the most vulnerable part, the effect of improving the overall breathability can be further improved.

In the method for controlling the distribution of nut coke in a blast furnace according to the present invention, the bottom surface of the blast furnace is divided into 11 equal parts to make the notch number 1 at the blast furnace wall part and the notch number 11 at the blast furnace center to be 4, 5, 6 , By placing the nut coke in the middle part of the blast furnace where the ventilation is the most vulnerable in the 7-person position, there is an effect of improving the overall breathability.

[Example 1]

The iron ore containing nut coke was loaded into the road top bunker, and the iron ore without nut coke was loaded up to 2/3 point in the road top bunker. In order to control the distribution of the residence time of the charges in the furnace bunker, the semi-circular furnace bunker is used to rapidly discharge in the direction directly above the outlet of the furnace bunker, and the charge is placed so that the residence time of the charge existing on the wall of the furnace bunker is the longest. After discharging, the nut coke distribution in the blast furnace was controlled by spraying constantly by notch using a chute from the blast furnace wall part in the radial direction that is the center of the blast furnace. The injection by the notch was sprayed 4, 4, 1 and 1 times at the positions of the notches No. 4, 5, 6 and 7, respectively.

5 is a schematic view showing the distribution in the blast furnace of the nut coke according to Example 1 according to the present invention.

As shown in FIG. 5, in the first embodiment, the iron ore 30 containing the nut coke 20 is pre-loaded into the furnace bunker 10 and the iron ore 40 without the nut coke 20 is exposed to the furnace bunker. (10) After charging to the 2/3 point in the inside, spraying on the notches Nos. 4, 5, 6, and 7 shows that the breathability was improved by placing the nut coke in the middle part of the blast furnace where the breathability was most vulnerable.

delete

delete

delete

delete

The contents of the present invention have been described with reference to one embodiment shown in the drawings, but this is merely exemplary, and those skilled in the art can understand that various modifications and other equivalent embodiments are possible therefrom. Will be able to. Therefore, the true technical protection scope of the present invention is indicated by the appended claims, and it should be interpreted that all changes or modifications derived from the meaning and scope of the claims and equivalent concepts are included in the scope of the present invention. do.

1: Blast furnace 2: Bunker
3: Hopper 4: Peter Spout
5: suit
10: Road top bunker 11: Road top bunker outlet
20: nut coke 30: iron ore with nut coke
40: iron ore without nut coke

Claims (4)

delete After discharging the charges from the semicircle-shaped furnace bunker, the charges are uniformly sprayed along the notch fractionated by using the chute in the radial direction that is the center of the blast furnace at the blast furnace wall.
The residence time of the charges in the semicircle-shaped furnace bunker is characterized by a rapid downstream flow along the upper portion of the outlet of the furnace bunker, resulting in the shortest residence time at the outlet and longer as it is discharged from the adjacent portion of the outlet and separated from the outlet. How to control the distribution of nut coke in the blast furnace. After discharging the charges from the semicircle-shaped furnace bunker, the charges are uniformly sprayed along the notch fractionated by using the chute in the radial direction that is the center of the blast furnace at the blast furnace wall.
The charge is an iron ore containing an iron ore and a nut coke (nut coke), the method of controlling the distribution of nut coke in the blast furnace, characterized in that the iron ore containing the nut coke is located in the top of the furnace bunker. After discharging the charges from the semicircle-shaped furnace bunker, the charges are uniformly sprayed along the notch fractionated by using the chute in the radial direction that is the center of the blast furnace at the blast furnace wall.
The fractionated notch is a position where the notch number is 4, 5, 6, 7 when the bottom surface of the blast furnace is divided into 11 and the notch number is 1 in the blast furnace wall and the notch number is 11 in the blast furnace center. A method for controlling the distribution of nut coke in a blast furnace, characterized in that the charge is sprayed at positions where the notch numbers are 4, 5, 6, and 7.

Images