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Method to prevent dry dust removal and explosion relief after converter blowing is interrupted

A technology of dry dust removal and converter blowing, applied in the manufacture of converters, etc., can solve the problems of changing the operating process system and increasing the difficulty of control, and achieve the effects of stabilizing smelting control, preventing explosion venting, and ensuring smooth production

Active Publication Date: 2020-11-24
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional method needs to change the operating process system, which increases the difficulty of control and other problems.

Method used

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  • Method to prevent dry dust removal and explosion relief after converter blowing is interrupted

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: The method for preventing explosion and venting by dry dust removal after converter blowing is interrupted is specifically described as follows.

[0017] In a 120t converter in a factory, heat number 1 is interrupted in converter blowing, and when the oxygen lance reaches the oxygen shut-off point in the process of raising the lance, the injection system is turned on, and the particle size is injected into the furnace with nitrogen through the nozzles evenly arranged at the furnace mouth. Mixed powder of carbon powder and coal powder less than 0.2mm. The number of nozzles is 2, the angle between the injection angle and the liquid surface is 75 degrees, the pressure used for injection is 0.8MPa, the injection volume of combustible powder is 20kg, and the injection time is controlled at 60s. After injection, the concentration of CO entering the electric field increased from 7% to 12% before injection, and O 2 The concentration of the gas is reduced from 4.5...

Embodiment 2

[0018] Embodiment 2: The method for preventing explosion and venting by dry dust removal after converter blowing is interrupted is specifically described as follows.

[0019] In a 120t converter in a factory, furnace number 2 is interrupted when the converter blowing is interrupted, and when the oxygen lance reaches the oxygen shut-off point during the oxygen lance lifting process, the injection system is turned on, and the particle size is injected into the furnace with nitrogen through the nozzles evenly arranged at the furnace mouth. ≤0.2mm toner. The number of nozzles is 8, the angle between the injection angle and the liquid surface is 30 degrees, the pressure used for injection is 0.6MPa, the injection volume of combustible powder is 100kg, and the injection time is controlled at 20s. After injection, the concentration of CO entering the electric field increased from 8% to 14% before injection, and O 2 The concentration of the gas is reduced from 4.6% before injection t...

Embodiment 3

[0020] Embodiment 3: The method for preventing explosion and venting by dry dust removal after converter blowing is interrupted is specifically described as follows.

[0021] In a 120t converter in a certain factory, when the converter blowing was interrupted for heat number 3, when the oxygen lance was lifted and the oxygen shut-off point was reached, the injection system was turned on, and the particle size was injected into the furnace with nitrogen through the nozzles evenly arranged at the furnace mouth. ≤1.8mm coal powder. The number of nozzles is 4, the angle between the injection angle and the liquid surface is 60 degrees, the pressure used for injection is 0.8MPa, the injection volume of combustible powder is 50kg, and the injection time is controlled at 50s. After injection, the concentration of CO entering the electric field increased from 10% to 17% before injection, and O 2 The concentration of the gas is reduced from 4.2% before injection to 1.8%, which prevents...

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Abstract

The invention discloses a method for preventing dry dedusting explosion venting after converter blowing breaking off. In the converter smelting process, breaking off happens, a lance needs to be lifted, in the oxygen lance lifting process, when the oxygen closing point is obtained, nozzles evenly formed in a furnace opening blow combustible powder to a furnace through non-explosive gas, and the combustible powder is carbon powder and / or coal powder. The combustible powder is blown into the furnace, the high temperature in the furnace is used for enabling the powder to have a reaction with excessive O2 in the furnace to generate CO, the concentration of CO entering an electric field can be improved, the O2 concentration is reduced to below 5%, the exploding limit of CO and O2 can be avoided, and the aim of effectively preventing explosion venting is achieved. The combustible powder has a reaction with the surplus oxygen in the furnace, the proportion of gas entering the electric field can be controlled, the problem that in the midway of converter smelting, the lance is lifted, and dry dedusting explosion venting is performed is solved, the dry method dedusting zero explosion ventingin the converter blowing breaking off process can be achieved, the smelting control is stabilized, smooth production is ensured, and a dry dedusting system more perfectly runs.

Description

technical field [0001] The invention belongs to the technical field of converter dry dust removal, in particular to a method for preventing dry dust removal and explosion relief after converter blowing is interrupted. Background technique [0002] Electrostatic field dust collector is an important dust removal method in converter steelmaking production. It is widely used in domestic steelmaking converters because of its advantages of water saving, electricity saving, good dust removal effect and less land occupation. CO, O contained in the flue gas in the electric field of the electrostatic precipitator 2 、H 2 When the explosive gas reaches the explosion limit, it will detonate in the electric field, causing the explosion relief valve to open, so that the internal detonation pressure will drop rapidly. Frequent explosion venting caused damage to the electrostatic precipitator system and restricted the normal production of the converter. [0003] Severe carbon-oxygen react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/38
CPCC21C5/30C21C5/38
Inventor 白银舰王金星曹斌连庆张冬生李亚厚
Owner HEBEI IRON AND STEEL
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