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Method of controlling emission of dry dedusting of converter

A technology of converter dry dust removal and dust removal fan, which is applied in the manufacture of converters and the improvement of process efficiency. It can solve the problems of electric precipitator explosion venting, discharge tower discharge exceeding the standard, dry dust removal discharge tower discharge exceeding the standard, etc., to achieve energy saving The effect of operation and reliable operation

Inactive Publication Date: 2019-09-24
HEBEI IRON AND STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When semi-steel is smelted, due to the particularity of semi-steel smelting, the discharge of dry dust removal towers exceeds the standard. After the explosion, the emission tower emitted black smoke, and the discharge seriously exceeded the standard; second, there was a slight discharge phenomenon in the initial stage of blowing; third, the emission of the emission tower exceeded the standard due to the interruption of blowing due to the failure of ignition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The method for controlling the emission of converter dry dust removal adopts the following specific processes.

[0034] A 120-ton converter is used for smelting, and the season is summer. After mixing the iron, prepare for blowing. After blowing, the electrostatic precipitator post and smelting post respectively carry out the following operations:

[0035] Electrostatic precipitator position: the target value of the outlet temperature of the evaporative cooler is 260 degrees, and the water regulating valve of the evaporative cooler is controlled by a fixed opening at 16% in the first 15 seconds before blowing, and the flow rate of the evaporative cooler is 19Nm 3 / h; 15 seconds after the start of blowing, the water regulating valve of the EVC water distribution is transferred to the water distribution curve control. The water distribution curve control takes the outlet temperature of the evaporative cooler as the control target. The target temperature au...

Embodiment 2

[0039] Embodiment 2: The method for controlling the emission of converter dry dust removal adopts the following specific processes.

[0040] A 120-ton converter is used for smelting, and the season is summer. After mixing the iron, prepare for blowing. After blowing, the electrostatic precipitator post and smelting post respectively carry out the following operations:

[0041] Electrostatic precipitator position: the target value of the outlet temperature of the evaporative cooler is 250 degrees, and the water regulating valve of the evaporative cooler is controlled by a fixed opening at 15% in the first 16 seconds before blowing, and the flow rate of the evaporative cooler is 18Nm 3 / h; 16 seconds after the start of blowing, the water regulating valve of the EVC water distribution is transferred to the water distribution curve control. The water distribution curve control takes the outlet temperature of the evaporative cooler as the control target. The target temperature au...

Embodiment 3

[0045] Embodiment 3: The method for controlling the emission of converter dry dust removal adopts the following specific processes.

[0046] A 120-ton converter is used for smelting, and the season is summer. After mixing the iron, prepare for blowing. After blowing, the electrostatic precipitator post and smelting post respectively carry out the following operations:

[0047] Electrostatic precipitator position: The target value of the outlet temperature of the evaporative cooler is 255 degrees, and the water regulating valve of the evaporative cooler is controlled by a fixed opening 14S before blowing starts, and the opening is controlled at 18%, and the flow rate of the evaporative cooler is 20Nm 3 / h; 14 seconds after the start of blowing, the water regulating valve of the EVC water distribution is transferred to the water distribution curve control. The water distribution curve control takes the outlet temperature of the evaporative cooler as the control target. The tar...

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Abstract

The invention discloses a method of controlling emission of dry dedusting of a converter. The method comprises an initial blowing stage, an early blowing stage, a middle blowing stage and a later blowing stage, specifically, in the initial blowing stage, fixedly controlling the opening of a water regulating valve of an evaporative cooler to 15-18% in the beginning 14-16 S of blowing, and controlling the flow of the evaporative cooler at 18-22 m<3> / h; after blowing for 14-16 S, by taking the outlet temperature of the evaporative cooler as a control target for controlling an EVC water distribution curve, adjusting the control target according to the environment temperature; in summer, the outlet temperature target value of the evaporative cooler is 250-260 DEG C, and in winter, the outlet temperature target value of the evaporative cooler is 310-320 DEG C; and the outlet temperature target values of the evaporative cooler in spring and autumn are 280-290 DEG C. By integrally controlling a primary dust collecting fan, EVC water distribution, top blowing of oxygen and nitrogen, on the premise of guaranteeing standard discharge of a diffusing tower, stable and reliable energy-saving operations of dry method dedusting equipment are guaranteed, so that the method is suitable for being popularized and applied in various iron and steel enterprises.

Description

technical field [0001] The invention relates to a steelmaking dedusting technology, in particular to a method for controlling the dry dedusting discharge of a converter. Background technique [0002] With the development of converter steelmaking technology, the steelmaking process is becoming more and more perfect, and the corresponding dust removal technology is also constantly developing and improving. At present, there are mainly two methods for the purification and recovery of flue gas in oxygen top-blown converter steelmaking, one is the flue gas wet purification recovery system, and the other is the flue gas dry purification recovery system. [0003] The converter flue gas dry purification and recovery system is mainly composed of evaporative cooler, electrostatic precipitator, fan, gas cooler, switching station, and diffuser tower. The dust removal effect is obviously better than the traditional wet dust removal. Compared with wet dust removal, dry dust removal has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/38C21C5/32
CPCC21C5/32C21C5/38Y02P10/20
Inventor 李艳东邢建军韩锋李涛王金星刘畅
Owner HEBEI IRON AND STEEL
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