CN-122012832-A - Method for reducing brick lining temperature of blast furnace hearth iron notch area

Abstract

Aiming at the condition that the temperature of brick lining in a tap hole area of a blast furnace is abnormally increased, the method aims at reducing the iron passing amount of a high-temperature tap hole by 10% -15% through adjusting tapping time sequence, recovering the tap hole depth to a normal level by increasing the tap hole mud amount by 5% -20% in 2 sections, controlling parameters such as molten iron [ Si ] to 0.50% -0.60%, and [ S ] to 0.018% -0.025%, repairing a slag iron solidification layer in the tap hole area under the conditions of keeping the furnace condition stable and smooth running and reducing yield loss, reducing the brick lining temperature in the tap hole area, eliminating safety risks and prolonging the service life of the blast furnace.

Inventors

• ZHAO XUEBIN
• WU SHUYONG
• SONG JIANZHONG
• WANG ZHAOHUI
• TANG SHUNBING
• YAN BIN
• SHI QING
• GONG LIWEI
• LI ZHUANGNIAN
• ZHANG ZHI

Assignees

• 山西太钢不锈钢股份有限公司

Dates

Publication Date

20260512

Application Date

20260206

Claims (2)

1. 1. A method for reducing the temperature of brick lining in a blast furnace hearth tap hole area is characterized by comprising the following steps: The method comprises the steps of firstly, adjusting tapping time and sequence, and reducing tapping time of a tap hole in a high-temperature area, wherein the tapping time of a double tap hole blast furnace is reduced, the tapping interval is 20-25 min, after the temperature rise of a tap hole area in 1# exceeds a safety control early warning value, after the tap hole in 1# is plugged, the tap hole in 2# is opened 25-35 min after the tap hole is plugged, after the tap hole in 2# is plugged, the tap hole in 1# is opened for 10-20 min after the tap hole is plugged, the tap hole in three or more tap hole blast furnaces are overlapped for 10-30 min, namely, the tap hole in the next tap hole is opened before the last tap hole is planned to be plugged for 10-30 min, at the moment, after the tap hole in the next tap hole is opened, the average tapping time is subtracted by the planned overlapping time for 10-15min on the basis of five days before the temperature rise of a hearth brick lining, the tap hole in 1# is correspondingly opened for 10-15min on the basis of the average tapping time before the hearth brick lining temperature rise, the tap hole in 1# is opened for 10-15min on the five days, the tap hole in the time is opened for 10-50 mm before the hearth lining is opened for the average time before the hearth lining temperature is increased for the hearth, and the tap hole in the average time is adjusted for the average time of the tap hole in the hearth is opened for 10-50 mm before the hearth is opened on the hearth on the basis of the hearth lining; Step two, increasing the mud beating amount in stages, maintaining the normal tap hole depth, namely when the thermocouple temperature in a tap hole area 1 is increased by more than 5% compared with the average value of five days before the temperature of the hearth brick lining is increased, increasing the mud amount by 5% -10% on the basis of the average mud beating amount of five days before the temperature of the hearth brick lining is increased, continuing to increase by 15% -20% on the basis of the average value of five days before the temperature of the hearth brick lining is increased, continuing to increase by 4% -5% on the basis of the average value of five days before the temperature of the hearth brick lining is increased, and returning the increased mud amount to 5% -10% of the average value of five days before the temperature of the hearth brick lining when the tap hole depth is not increased; and thirdly, adjusting the fuel ratio and controlling Si and S.
2. 2. A method for reducing the brick lining temperature of a blast furnace hearth tap hole area is characterized in that Si and S are controlled in the third step, and the Si of molten iron is controlled to be 0.50% -0.60% and the S is controlled to be 0.018% -0.025% by adjusting a fuel ratio, a heat system and a slag making system at the same time.

Description

Method for reducing brick lining temperature of blast furnace hearth iron notch area Technical Field The invention relates to a blast furnace ironmaking technology, in particular to a method for reducing the temperature of brick lining in a hearth iron notch area of a blast furnace. Background The blast furnace hearth plays a role of supporting the blast furnace body, accommodating and discharging molten iron. The structure of the hearth is typically composed of refractory material, a cooling system and a support structure. Refractory materials are the core of the hearth, typically carbon bricks or ceramic materials, to withstand the erosion and thermal stresses of the high temperature melt. The cooling system cools the brick lining in the hearth through the water cooling wall, so that the hearth is prevented from being damaged due to overhigh temperature. The lining in the hearth iron notch area is subjected to the scouring and thermal stress action of high-temperature molten iron for a long time, when the brick lining is degraded, peeled off or even fails, the thickness of the brick lining is correspondingly thinned, the heat flux is increased, and the thermocouple temperature embedded into the brick lining is correspondingly increased. Therefore, the tap hole area hearth thermocouple temperature can reflect the working state of the tap hole area hearth brick lining. Reducing the temperature of brick lining in the hearth tap hole area is a key link in the operation of the blast furnace. Too high hearth temperatures are indicative of erosion of the refractory material, and can shorten hearth life and even cause safety accidents. Therefore, when the temperature of the brick lining of the hearth in the iron notch area is increased, the brick lining temperature is reduced through technological measures, so that the safe and stable operation of the blast furnace can be ensured, the service life of the hearth is prolonged, and the production cost is reduced, thereby being one of important technical difficulties in the operation of the blast furnace. Aiming at the condition that the temperature of the brick lining in the tap hole area of the blast furnace is abnormally increased, parameters such as tapping time sequence, tap hole mud beating amount, molten iron [ Si ] content and [ S ] content are adjusted, and under the conditions of keeping the stable and smooth running of the furnace condition and reducing yield loss, the method for reducing the temperature of the brick lining in the tap hole area of the blast furnace is provided, so that the temperature of the brick lining in the tap hole area of the blast furnace is reduced, the safety risk is eliminated, and the service life of the blast furnace is prolonged. Disclosure of Invention The invention aims to solve the problems and provides a method for reducing the temperature of brick lining in a tap hole area of a blast furnace hearth. The method for reducing the brick lining temperature of the tap hole area of the blast furnace hearth comprises the following steps of firstly, adjusting tapping time and sequence, and reducing tapping time of the tap hole in a high-temperature area, wherein the tapping interval is 20-25 min, after the thermocouple temperature of the tap hole area in the 1# is increased beyond a safety control early warning value, the tap hole in the 1# is blocked, the tap hole in the 2# is opened for 25-35 min after the tap hole in the 1# is blocked, and the tap hole in the 1# is opened for 10-20 min after the tap hole in the 2# is blocked; three or more tap hole blast furnaces are subjected to overlapped tapping for 10-30 min, namely the next tap hole is opened before the previous tap hole is planned to be plugged for 10-30 min, after the 1# tap hole is opened, the opening time of the next tap hole is 10-15min in advance on the basis of subtracting the planned overlapped time from the average tapping time of five days before the temperature of the hearth brick lining is increased, the 1# tap hole plugging time is correspondingly 10-15min in advance from the average tapping time of five days before the temperature of the hearth brick lining is increased, the opening time of the 1# tap hole when tapping again is 10-15min in advance on the basis of the average tapping time of five days before the temperature of the hearth brick lining is increased, and the other furnace tap holes are plugged according to the average tapping time of five days before the temperature of the hearth brick lining is increased; on the basis of the adjustment of tapping time, the diameter of the No. 1 tap hole drill bit is reduced by 5mm, namely the diameter of a normal drill bit is 50-55 mm and is adjusted to 45-50 mm, step two, namely the tap hole depth is increased in stages, namely when the thermocouple temperature in the No. 1 tap hole area is increased to be more than 5% lower than the average value of five days before the temperature of the hearth brick lining i