Blast furnace newly used iron notch depth control method

Abstract

The invention relates to a blast furnace newly used iron notch depth control method. The blast furnace newly used iron notch depth control method comprises the following steps of a, baking a newly repaired iron slag trough through coal gas fire after completion of repairing on the iron slag trough to enable the iron slag trough to have the iron slag discharge function; b, enabling the liquid levelof a hot metal ladle with a certain iron content to the iron receiving position of an iron notch to be used; c, starting slag flushing water of the newly used iron notch to enable an iron notch to benewly used to have the iron tapping function; d, immediately starting a hydraulic gun to press gun mud in to block the iron notch after iron slag flows out from the iron notch; e, preliminarily forming an iron notch mud drum, drilling the iron notch open again and immediately blocking the iron notch when iron slag flows out; and f, operating the iron notch to be used for 4-6 heats according to the steps of c, d and e and increasing the depth of the iron notch to the normal control standard range. Through the blast furnace newly used iron notch depth control method, the first-heat depth of thenewly used iron notch of a blast furnace is controlled within the standard range when iron slag is charged into the iron notch.

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