JPH0472005A - Method for adjusting the temperature of hot metal between the tap hole of a blast furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for adjusting the temperature of hot metal between the tap holes of a blast furnace, which adjusts the temperature of hot metal between the tap holes.

[Prior Art] In order to adjust the temperature inside a blast furnace at the tuyere level, water is injected from the tuyere. The branch pipes that supply water to the water injection lances of each tuyere are directly connected to the water mains.
The amount of water blown in is adjusted by adjusting the main valve installed in the water main pipe.

The temperature inside the furnace at the tuyere level has a positive correlation with the hot metal temperature, so if the hot metal temperature is too high,
Increase the opening of the main valve of the water main to increase the amount of water blown from the tuyeres to lower the hot metal temperature, and if the hot metal temperature is too low, throttle the main valve to reduce the amount of water blown from the tuyeres. , the hot metal temperature was raised.

[Problems to be Solved by the Invention] However, even if the amount of water blown into water is adjusted by the main valve of the water main, the temperature of the entire hot metal (average temperature of the hot metal) increases or decreases, and the temperature of the hot metal between the tap holes increases. There is a problem in that if a temperature difference occurs, it cannot be corrected. For this reason, the fuel ratio could not be lowered, and the St% in the hot metal of the hot metal between the tap holes was non-uniform.

[Means for Solving the Problems] This invention attempts to solve the above-mentioned problems, and includes a control method that divides the tuyere of a blast furnace into a plurality of blocks and controls the amount of water blown into the tuyere for each block. This is a method for adjusting the temperature of hot metal between tap holes in a blast furnace, characterized in that a valve is provided, and the amount of water blown into the tuyere of a block is adjusted by the control valve to equalize the temperature of hot metal between the tap holes.

[Action] By operating the control valve of the tuyere block, the amount of water blown into the tuyere block can be adjusted.If the amount of water blown into the tuyere block is increased or decreased, the amount of water blown into the tuyere block can be adjusted. The temperature inside the furnace decreases or increases, and the temperature of the hot metal below the tuyere block decreases or increases. Therefore, by adjusting the amount of water blown into the tuyere block above the tap hole where a difference in hot metal temperature has occurred, the hot metal temperature between the tap holes can be made uniform.

[Example] Examples of the present invention will be described in detail below. Figure 1 is a layout diagram of the water injection tuyere block, control valve, and tap hole of the blast furnace. Figure 0 shows the 42 water injection tuyere A (hereinafter referred to as tuyere
The figure shows an example of a blast furnace with a The 42 tuyeres A are divided into 8 blocks (indicated by symbol B) around the entire circumference, with 4 to 6 tuyere A being one block, and the water supply branch pipe E of the water injection lance of the tuyere A in the block is connected to the same header pipe F. A control valve is provided on the water pipe G that connects to the header pipe F.

Each water pipe G is connected to a water main (not shown).
C in the figure shows the location of the tap hole, and the symbol TH in parentheses represents the tap hole, and ITH means No. 1 tap hole. 6 Usually, 40 to 50 g is extracted from each tuyere. / N■3
water is being blown into the area.

The amount of water blown is adjusted as follows. For example, if the temperature of hot metal from ITH is 10°C or more lower than the target value,
NOI above and around H.

2. Decrease the amount of water blown into 8 Roblox by 10%9
On the other hand, if the hot metal temperature is 10℃ or more higher than the target value,
Increase the amount of water blown into the N0I 2.8 Roblox above and around ITH by 10%. Then, by looking at the change in temperature of the hot metal from the tap hole for the second or third time after changing the amount of blown water, it is decided whether to leave it as it is or to take additional action. FIG. 2 is a graph showing the change in hot metal temperature when the method of the present invention is carried out with a difference in hot metal temperature between the tap holes. The hot metal temperature of ITH is the target temperature (1500
℃), the hot metal temperature of 2TH was 10℃ higher than the target temperature, and the temperature range between the tapholes was 25℃, so the NOI above the ITH and the blowing of the 2.8-blade roblox were Reduce water volume by 10%, NO3,4 above 2TH,
Increased the amount of water blown into 5 Roblox by 10%. ITH
The hot metal temperature of 2TH reached the target temperature 10 hours after changing the amount of blown water (during the second tapping), and the hot metal temperature of 2TH reached almost the target temperature 14 hours after changing the amount of blown water (during the second tapping). The target temperature has been reached.

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

(1) If there is a difference in hot metal temperature between the tap holes, the difference can be corrected by simply adjusting the amount of water blown into the tuyere blocks above or above the tap hole and around it. .

(Since the amount of water blown into some of the tuyeres around Furnace 21 is adjusted, the fuel ratio can be reduced compared to the conventional method.

f3) With f1+, the Sj% of hot metal between the tap holes can be made uniform.

[Brief explanation of the drawing]

FIG. 1 shows a block of a water injection tuyere for a blast furnace according to the present invention;
FIG. 2 is a layout diagram of a control valve and a tap hole, and a graph showing a change in hot metal temperature when the method of the present invention is implemented. A: Tuyere, B: Tuyere block number, C: Tap hole,
D...Control valve.

Claims (1)

[Claims] The tuyere of the blast furnace is divided into multiple blocks, and a control valve is installed to control the amount of water blown into the tuyere for each block. A method for adjusting the temperature of hot metal between the tap holes of a blast furnace, which is characterized by making the temperature uniform.