CN110643768A

CN110643768A - Method for controlling depth of newly-thrown taphole of blast furnace

Info

Publication number: CN110643768A
Application number: CN201910062934.0A
Authority: CN
Inventors: 陈生利; 李国超; 陈小东; 邓晖; 徐英彪; 庄锦填; 黄立薇; 徐国庆; 于美晨; 蔡林
Original assignee: Shaogang Songshan Co Ltd Guangdong
Current assignee: SGIS Songshan Co Ltd; Shaogang Songshan Co Ltd Guangdong
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2020-01-03
Anticipated expiration: 2039-01-23
Also published as: CN110643768B

Abstract

The invention relates to a method for controlling the depth of a newly-thrown taphole of a blast furnace, which comprises the following steps: a) after the blast furnace iron slag groove repairing is finished, the structure is baked by gas fire to newly repair the iron slag groove, so that the iron slag groove has the function of discharging iron slag; b) the method comprises the following steps of (1) pouring a ladle with a certain iron capacity to a receiving position of a taphole to be put into; c) starting slag flushing water newly added into the taphole to enable the taphole to be prepared to have a tapping function; d) after the slag iron at the taphole flows out, immediately starting a hydraulic gun to press in stemming to plug the taphole; e) forming a taphole mud bag preliminarily, organizing again to drill the taphole, and immediately plugging the taphole after slag iron flows out; f) and c, preparing the iron notch to be used for 4-6 times according to the operations of the steps c, d and e, and increasing the depth of the iron notch to a normal control standard range. The depth of the first furnace time of the blast furnace newly-thrown iron notch for throwing the slag iron is within the control standard range.

Description

Method for controlling depth of newly-thrown taphole of blast furnace

Technical Field

The invention belongs to the technical field of blast furnace stokehold control, and relates to a method for controlling the depth of a newly-thrown taphole of a blast furnace.

Background

At present, a large-scale blast furnace generally has 3-4 tapholes, and an iron runner and a slag runner matched with the tapholes of the blast furnace need to be repaired regularly according to the iron flux and the damage degree to ensure the safety of the slag iron runner, so the tapholes of the blast furnace usually adopt a tapping mode of dual-purpose one-standby or dual-purpose two-standby to complete the discharge work of the blast furnace slag iron.

The regular repair of the blast furnace slag iron runner needs to stop the corresponding iron notch, the time for repairing the slag iron runner is generally 10 to 15 days, and the iron notch is periodically and alternately used for tapping according to the working state of the iron notch and the slag iron runner in the running state.

After the blast furnace taphole is stopped, as the taphole is close to the hearth area mud bag and the stemming filling can not be timely supplemented, under the action of hearth slag iron circulation scouring, the taphole mud bag gradually disappears, the taphole pore channel can be gradually eroded and scoured by the high-pressure high-speed flowing slag iron, and the taphole depth becomes shallow. Usually, in the period of repairing the slag iron runner and stopping the runner, the depth of a newly-thrown iron notch becomes 500-1000mm, the depth of the iron notch is insufficient, the normal discharge of the blast furnace slag iron is seriously influenced, and the phenomenon that molten iron cannot be discharged for a long time after the iron notch is opened is serious, so that the blast furnace slag iron wind pressure high-air-reduction operation is caused, the productivity of the blast furnace is reduced, and great economic loss is brought to the production of the blast furnace. Meanwhile, the temperature of carbon bricks in the area of the iron notch of the furnace hearth is easily increased due to the slag iron discharged from the shallow iron notch, and the depth of the iron notch is insufficient for multiple times, so that the burning-through accident of the furnace hearth can be seriously caused.

Under the existing technical conditions, the depth of a newly-thrown iron notch does not meet the control standard requirement, and under the condition, operators in front of a blast furnace fill a mud bag by adopting a method of pressing more stemming when the iron notch is blocked, and the depth of the iron notch can be gradually controlled within the control standard range by taking two days for 8-10 heats of iron generally.

Under the prior art, because the depth of a newly-thrown iron notch is insufficient, the phenomenon of coke blocking of an iron notch channel after the iron notch is opened is also very obvious, a staff in front of a furnace is required to organize and poke the iron notch 3-5 times, a drill rod with the length of 6-8 meters is consumed when poking the iron notch once, and the cost of spare parts in front of the furnace is greatly increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a method for controlling the depth of a newly-thrown taphole of a blast furnace, which is characterized in that the taphole is opened and blocked immediately before being newly put into use, and the amount of the taphole clay pressed into the taphole is increased appropriately, so that a channel and a taphole clay bag of the newly-thrown taphole are pre-filled with the stemming, and the depth of the newly-thrown taphole of the blast furnace in the first furnace time of throwing the slag iron is in a control standard range.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling the depth of a newly-thrown taphole of a blast furnace comprises the following steps:

a) after the blast furnace iron slag groove repairing is finished, the structure is baked by gas fire to newly repair the iron slag groove, so that the iron slag groove has the function of discharging iron slag;

b) the method comprises the following steps of (1) filling a ladle with a certain iron capacity to a receiving position of a taphole to be filled in a casting state of other tapholes of a blast furnace one day before a new taphole corresponding to a newly repaired slag iron runner is filled in a required organization;

c) starting slag flushing water newly added into the taphole to enable the taphole to be prepared to have a tapping function;

d) starting a tapping machine to drill an iron notch to be used, withdrawing the tapping machine, immediately starting a hydraulic gun to press into stemming to plug the iron notch after iron slag on the iron notch flows out, and withdrawing the hydraulic gun 30min after the iron notch is plugged;

e) after 2 hours of the blocking of the taphole, sintering and shaping stemming in the taphole channel, preliminarily forming a taphole mud pack, organizing again to drill the taphole, immediately blocking the taphole after slag iron flows out, and withdrawing the hydraulic gun 30min after the blocking;

f) and c, preparing the iron notch to be used for 4-6 times according to the operations of the steps c, d and e, and increasing the depth of the iron notch to a normal control standard range.

Preferably, the amount of the plugging mud pressing in the step d is 30-50kg more than that of the normal plugging taphole mud pressing in.

Preferably, in the step e, the tissue performs the opening and closing operation on the taphole next time after 3 hours of taphole closing.

The invention has the positive effects that: through throwing the iron notch newly earlier stage, open promptly to the iron notch implementation and block up the technique promptly, through increasing stifled mouthful big gun mud volume of impressing, effectively filled the formation of iron notch passageway and mud package, stopped newly throwing the indisputable operation of slagging tap under the not enough state of iron notch degree of depth, avoided drawing newly to drop into the shallow adverse effect that brings for blast furnace production of iron notch. Meanwhile, the method carries out the pretreatment of opening and blocking the newly-input tap hole, realizes the effect of quickly recovering the depth of the tap hole, and reduces the harm of tapping from a shallow tap hole to the safety of a blast furnace hearth.

Detailed Description

The present invention will be further described with reference to the following examples.

The first embodiment is as follows:

and a) arranging 4 tapholes in the blast furnace in the step a), wherein the normal depth of the taphole is 3500mm, the tapholes 1 and 2 are used for tapping, and the slag iron runner is repaired in the state that the tapholes 3 and 4 are stopped, and after the repairing is finished and the baking is finished. And b) preparing to put into a No. 3 taphole for use, and stopping the No. 1 taphole to repair the slag iron runner. And c) opening slag flushing water corresponding to the No. 3 taphole in the step c). In the step d), the No. 3 tapping machine is started to drill the No. 3 taphole, the depth of the taphole is 2700mm, the tapping machine is withdrawn, the No. 3 taphole has slag iron to flow out, the No. 3 hydraulic gun is started, 320kg of anhydrous stemming is pressed in, and the No. 3 taphole is plugged. And in e), after the No. 3 taphole is blocked by the hydraulic gun for 3 hours, drilling the No. 3 taphole again, wherein the depth of the taphole is 2900mm, and after the taphole is opened, the No. 3 hydraulic gun is started immediately, 320kg of stemming is pressed in, and the No. 3 taphole is blocked. After 3 hours, drilling a No. 3 iron notch for the third time, wherein the depth of the iron notch is 3200mm, starting a No. 3 hydraulic gun after the slag iron flows out, pressing 315kg of stemming in, and plugging the No. 3 iron notch. After 3 hours, drilling a No. 3 taphole for the fourth time, wherein the depth of the taphole is 3600mm, starting a No. 3 hydraulic gun after the slag iron flows out, pressing in the normal gun mud amount of 270kg, and plugging the No. 3 taphole. And opening and blocking the No. 3 taphole after 4 times, wherein the depth of the taphole meets the control standard requirement, putting the No. 3 taphole into operation formally, and stopping the No. 1 taphole to repair the slag iron runner.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling the depth of a newly-thrown taphole of a blast furnace is characterized by comprising the following steps:

2. The method for controlling the depth of a newly-placed taphole of a blast furnace according to claim 1, wherein: and d, the mud pressing amount of the blocking hole in the step d is 30-50kg more than the mud pressing amount of a normal iron blocking hole.

3. The method for controlling the depth of a newly-placed taphole of a blast furnace according to claim 1, wherein: and in the step e, after 3 hours of iron notch plugging, the next time of the iron notch is opened and then the iron notch is plugged.