阅读说明：本技术 一种降低干法除尘爆燃、泄爆率的炉钢吹炼方法 (method for blowing steel in furnace to reduce explosion and deflagration rate and explosion venting rate by dry dedusting ) 是由 张威 卓钧 李子攀 郭振宇 谢林超 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种降低干法除尘爆燃、泄爆率的炉钢吹炼方法,在半钢炼钢吹氧前(一次吹炼或吹炼中断二次吹炼)先吹30-60秒的氮气,然后再下枪吹氧；下枪吹氧后,立即向除尘管道内吹氮气60-90秒。两种吹氮的方式保证了静电场内一定的氮气浓度,抑制了静电场内CO和O2的反应,避免干法除尘爆燃或泄爆。(The invention discloses furnace steel converting methods for reducing the explosion and explosion release rate of dry dedusting, which comprises the steps of firstly blowing nitrogen for 30-60 seconds before oxygen blowing ( times of converting or secondary converting interruption of converting) in semisteel steelmaking, then blowing oxygen by a gun, immediately blowing nitrogen for 60-90 seconds into a dedusting pipeline after oxygen blowing by the gun, wherein the two nitrogen blowing modes ensure constant nitrogen concentration in an electrostatic field, inhibit the reaction of CO and O2 in the electrostatic field and avoid explosion and explosion release of dry dedusting.)

1, A blowing method for reducing the deflagration and explosion venting rate of dry dedusting, which is characterized by comprising the following steps:

s1, blowing inert gas into the converter before blowing, and then entering the step S2;

s2, blowing oxygen into the converter to carry out the blowing.

2. The converting method according to claim 1, wherein the inert gas in the step S1 is N₂。

3. The blowing method according to claim 1, wherein the blowing of the inert gas into the converter before the blowing in step S1 is: blowing inert gas into the converter for 30-60s before blowing at a flow rate of 45000Nm³/h。

4. The blowing method according to claim 1, wherein the blowing of the inert gas into the converter before the blowing in step S1 is: before blowing, after the iron-adding converter returns to the zero position, inert gas is blown into a lower gun in the converter.

5. The blowing method according to claim 4, wherein said blowing with oxygen into said converter in step S2 is carried out by: and lifting the lance to a waiting position, and then lowering the lance to blow oxygen into the converter for converting.

6. The converting method according to any of claims 1 to 5 and , wherein the step S2 further comprises blowing an inert gas into the dust removal duct immediately after the blowing of the oxygen gas into the converter for the converting.

7. The converting method according to claim 6, wherein the inert gas in the step S2 is N₂。

8. The converting method according to claim 6, wherein the step S2 of blowing the inert gas into the dust removal duct immediately is: immediately blowing inert gas into the dust removal pipeline for 60-90s at the flow rate of 4000Nm³/h。

9. The converting method of claim 1, wherein the converting in step S1 and step S2 includes converting and converting the interrupted second converting.

10. The converting method of claim 1, wherein the step S2 further comprises: after oxygen is blown into the converter to carry out the blowing, under the condition of equipment failure and before blowing again after equipment recovery, inert gas is blown into the converter, and then oxygen is blown into the converter to carry out the blowing again.

Technical Field

The invention relates to the technical field of metallurgy dust removal, in particular to furnace steel converting methods for reducing the explosion and explosion venting rate of dry dust removal.

Background

At present, a steel-making converter mostly adopts a dry dedusting mode to treat smoke dust generated in the steel-making process.

When a converter adopting semisteel smelting is subjected to secondary lance discharge in the blowing process in the early stage of blowing, the CO generation speed is high and O is generated₂The carbon and oxygen are not completely consumed, and the dry dedusting explosion and explosion venting are caused by carbon and oxygen reaction in the electrostatic field.

The explosion or explosion venting of the dry dedusting can damage the dedusting equipment and interrupt production.

Disclosure of Invention

In view of the above, the invention provides furnace steel converting methods for reducing the deflagration and explosion venting rate of dry dedusting, and CO and O in an electrostatic field are inhibited₂The deflagration or explosion venting caused by dry dedusting is avoided.

In order to achieve the purpose, the invention provides the following technical scheme:

A blowing method for reducing the explosion and deflagration rate and explosion venting rate of dry dedusting, comprising the following steps:

s1, blowing inert gas into the converter before blowing, and then entering the step S2;

s2, blowing oxygen into the converter to carry out the blowing.

Preferably, the inert gas in the step S1 is N₂。

Preferably, the blowing of the inert gas into the converter before the blowing in step S1 is: blowing inert gas into the converter for 30-60s before blowing at a flow rate of 45000Nm³/h。

Preferably, the blowing of the inert gas into the converter before the blowing in step S1 is: before blowing, after the iron-adding converter returns to the zero position, inert gas is blown into a lower gun in the converter.

Preferably, the blowing of oxygen into the converter in step S2 is performed by: and lifting the lance to a waiting position, and then lowering the lance to blow oxygen into the converter for converting.

Preferably, the step S2 further includes: and blowing oxygen into the converter for blowing, and immediately blowing inert gas into the dust removal pipeline.

Preferably, the inert gas in the step S2 is N₂。

Preferably, the blowing of the inert gas into the dust removal pipeline in the step S2 is as follows: immediately blowing inert gas into the dust removal pipeline for 60-90s at the flow rate of 4000Nm³/h。

Preferably, the blowing in the step S1 and the step S2 includes times of blowing and blowing interruption for two times of blowing.

Preferably, the step S2 further includes: after oxygen is blown into the converter to carry out the blowing, under the condition of equipment failure and before blowing again after equipment recovery, inert gas is blown into the converter, and then oxygen is blown into the converter to carry out the blowing again.

According to the technical scheme, the furnace steel converting method for reducing the deflagration and explosion venting rate of the dry dedusting provided by the invention has the advantages that nitrogen is firstly blown for 30-60 seconds before oxygen blowing for semisteel smelting ( times of converting or secondary converting interruption of converting) and then oxygen is blown by a lower gun, nitrogen is immediately blown into a dedusting pipeline for 60-90 seconds after oxygen blowing by the lower gun, and the two nitrogen blowing modes ensure fixed nitrogen concentration in an electrostatic field, and inhibit CO and O in the electrostatic field₂The deflagration or explosion venting caused by dry dedusting is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic flow chart of a blowing method for reducing deflagration and explosion venting rates of dry dedusting according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

The blowing method for reducing the deflagration and explosion venting rate of dry dedusting provided by the embodiment of the invention comprises the following steps:

s1, blowing inert gas into the converter before blowing, and then entering the step S2;

s2, blowing oxygen into the converter for converting; the oxygen blown in may be air or industrially pure oxygen.

According to the technical scheme, the furnace steel converting method for reducing the deflagration and explosion venting rate of the dry dedusting provided by the embodiment of the invention has the advantages that the inert gas is blown in before the oxygen blowing of the steel converter, so that the air in the dedusting pipeline and the electrostatic field can be removed, the concentration of O and CO in the electrostatic field is reduced, and the concentration of CO and O in the electrostatic field is inhibited₂The deflagration or explosion venting caused by dry dedusting is avoided. The scheme is particularly suitable for semi-steel smelting.

Preferably, the inert gas in step S1 is N₂The cost is not high, and the original equipment can be utilized without increasing or improving the equipment. It will be appreciated that other inert gases may be used depending on the field conditions and will not be described in detail herein.

, the step of blowing inert gas into the converter before blowing in the step S1 is to blow inert gas into the converter before blowing at a flow rate of 45000Nm for 30-60S³The constant nitrogen concentration of in the electrostatic field can be ensured, so that the phenomenon that the CO concentration is more than or equal to 9 percent and O does not occur in the time of periods of blowing₂The concentration is more than or equal to 6 percent, and deflagration or explosion venting occurs. Of course, the time and the flow rate of the inert gas can be adjusted by those skilled in the art according to the actual working conditions.

In this embodiment, the inert gas to be blown into the converter before blowing in step S1 is: before blowing, after the iron-adding converter returns to the zero position, inert gas is blown into a lower gun in the converter to fit the existing working procedure.

Specifically, in the step S2, the oxygen is blown into the converter so that the lance is lifted to a standby position and then the lance is lowered to blow oxygen into the converter so as to carry out the blowing, and the conventional and previous steps are carried out in step .

Preferably, the step S2 further comprises blowing an inert gas into the dust removal duct immediately after blowing oxygen into the converter to reduce the concentration of O and CO in the electric field, wherein during the blowing of the inert gas, the step S can further ensure that the oxygen concentration is not less than 9% and O does not occur₂The concentration is more than or equal to 6 percentAnd deflagration or explosion venting occurs.

In order to further optimize the above technical solution, the inert gas in step S2 is N₂The cost is not high, and the existing equipment can be used. It will be appreciated that other inert gases may be used depending on the field conditions and will not be described in detail herein.

In this embodiment, the inert gas is immediately blown into the dust removal duct in step S2 as follows: immediately blowing inert gas into the dust removal pipeline for 60-90s at the flow rate of 4000Nm³The constant nitrogen concentration of in the electrostatic field can be ensured, so that the phenomenon that the CO concentration is more than or equal to 9 percent and O does not occur in the time of periods of blowing₂The concentration is more than or equal to 6 percent, and deflagration or explosion venting occurs. Of course, the time and the flow rate of the inert gas can be adjusted by those skilled in the art according to the actual working conditions.

Specifically, the blowing in the step S1 and the step S2 comprises times of blowing and secondary blowing interruption of blowing, namely, the method can be suitable for blowing under different conditions and solves the problems of dry dedusting explosion or explosion release when a gun is put in.

In order to further optimize the above technical solution, step S2 further includes blowing inert gas into the converter after blowing oxygen into the converter for blowing, and before blowing again after recovery of the equipment in case of equipment failure, blowing oxygen into the converter for blowing again, that is, the previous step S1 is completely repeated after recovery of the failure.

The present solution is further described in with reference to the following embodiments: