A Method for Controlling the Depth of a New Casting Hole of a Blast Furnace

Abstract

The invention relates to a method for controlling the depth of a new iron casting hole of a blast furnace. Function; b) Exchange the molten iron ladle with a certain amount of iron to the iron receiving position of the tap hole to be put in; c) Start the slag flushing water for the newly put into the tap hole, so that the tap hole to be newly thrown has the function of tapping iron; d ) After seeing the slag and iron flowing out of the iron hole, immediately start the hydraulic gun to press the gun mud to seal the iron hole; e) The mud bag of the iron hole is initially formed, and then organize to drill the iron hole again, and immediately block the hole after seeing the slag and iron flowing out; f) According to steps c, d, and e, operate the 4-6 heats of the tap hole ready to be put into use, and the depth of the tap hole is increased to the normal control standard range. Realize that the depth of the first furnace of the new iron casting port of the blast furnace is within the control standard range.

Description

technical field [0001] The invention belongs to the technical field of blast furnace front control, and relates to a method for controlling the depth of a new casting hole of a blast furnace. Background technique [0002] At present, large-scale blast furnaces generally have 3-4 tapholes. The iron trenches and slag trenches for the blast furnace tapholes need to be regularly repaired according to the iron flux and damage degree to ensure the safety of the slag-iron trenches. Therefore, the blast furnace tapholes are usually The tapping mode of dual-purpose and one-standby or dual-purpose and two-standby is adopted to complete the discharge of blast furnace slag and iron. [0003] The regular repair of the blast furnace slag and iron trench requires stopping the corresponding iron gate. Generally, it takes 10-15 days to repair the slag and iron trench. iron. [0004] After the taphole of the blast furnace is stopped, because the mud bag near the hearth area of ​​the tap hol...

AI Technical Summary

Problems solved by technology

Usually, during the period of repairing the slag iron ditch and stopping the ditch, the depth of the new iron casting hole will become shallower by 500-1000mm. The depth of the iron hole is insufficient, which seriously affects the normal discharge of blast furnace slag and iron. After opening the iron hole, the molten iron cannot be discharged for a long time. As a result, blast furnace slag slag iron wind pressure is high and wind reduction operation, blast furnace production capacity is reduced, and large economic losses are brought to blast furnace production

At the same time, the slag iron from the shallow iron hole will easily cause the temperature of the carbon brick in the hearth iron hole area to rise, and the depth of the iron hole in multiple furnaces will be insufficient, which will seriously cause hearth burn-through accidents

[0005] Under the existing technical conditions, the depth of the new iron casting hole does not meet the requirements of the control standard. Under such circumstances, the operators in front of the blast furnace all use the method of pressing more gun mud when blocking the iron hole to fill the mud bag , it generally takes 8-10 heats of iron and it takes two days to gradually bring the depth of the iron hole to the control standard range

[0006] Under the current technical conditions, due to the lack of depth of the new tap hole, the phenomenon of coke stuck in the tap hole channel is particularly obvious after opening the tap hole. Usually, it is necessary for the staff in front of the furnace to poke the tap hole 3-5 times, and the tap hole will be consumed every time. A 6-8 meter long drill pipe greatly increases the cost of spare parts in front of the furnace