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Method for automatic bottom blowing control of converter

A bottom blowing control and converter technology, which is applied in the manufacture of converters, etc., can solve problems such as poor hardware operation and increased costs, and achieve the effects of reducing blowing time and material consumption, reducing operating intensity, and reducing production costs.

Inactive Publication Date: 2011-05-04
BEIJING JIANLONG HEAVY IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Redundant software system makes the hardware run poorly, and adding too much hardware system will increase the cost, which is not advisable

Method used

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  • Method for automatic bottom blowing control of converter
  • Method for automatic bottom blowing control of converter
  • Method for automatic bottom blowing control of converter

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for automatic bottom blowing control of a converter, the hardware system used in the method, such as figure 1 shown. The hardware system used in the method described in this embodiment includes: a converter 2 with re-blowing function, an oxygen pipe 1 is arranged on the upper part of the converter, and oxygen is blown into the furnace. Ventilation bricks are arranged at the bottom of the converter. The branch pipeline 5 connected to the air brick is connected to the valve station through the rotary joint 3 of the converter trunnion and the metal hose 4 . The valve station for supplying argon and nitrogen is actually a device for controlling the switching and flow of argon and nitrogen, and consists of a series of pressure regulating valves, gas bags, branch pipe flow regulating valves, etc. PLC is an electronic control system that can control the valve station. PLC has a man-machine exchange interface HMI, and the controller can control the smelting process t...

Embodiment 2

[0047] This embodiment is an improvement of the first embodiment, and it is a refinement of the bottom blowing model of the first embodiment. The bottom blowing model described in the present embodiment comprises:

[0048] According to the requirements of the steel type on the nitrogen content in the finished product, it is divided into the following three bottom blowing control methods:

[0049] a. For steel types with N ≤ 40PPM, argon is blown throughout the bottom blowing of the converter during the blowing process. image 3 It is a schematic diagram of the blowing process of blowing argon throughout. The vertical axis represents the gas flow rate of bottom blowing, and the straight horizontal line is only for illustration, and there are usually some fluctuations in the actual smelting process, especially in the process of oxygen blowing. exist figure 2 This change can be seen in the table of .

[0050] b. For steel grades with 40 Figure 4 Schematic diagram of blowing ...

Embodiment 3

[0061] This embodiment is an improvement of Embodiment 2, which relates to the refinement of nine bottom blowing models displayed on the HMI. The nine bottom blowing models described in this embodiment are represented by 1-9 Arabic numerals respectively, and the nine Arabic numerals are displayed on the HMI in the form of a bottom blowing model matrix, and steel is marked on the upper and left sides of the bottom blowing model matrix respectively. The carbon content and nitrogen content of the species, such as Figure 6 shown.

[0062] The nine bottom blowing models in this embodiment are displayed on the HMI, which is a concise display, and the controller can easily select the required model from the bottom blowing model matrix. When selecting, you only need to observe the nitrogen content on the far left of the bottom blowing model matrix and the carbon content in the upper part of the bottom blowing model matrix, and then look for the intersection point of the two, which i...

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Abstract

The invention relates to a method for the automatic bottom blowing control of a converter. Hardware adopted by the method in the invention comprises a converter with a combined blowing function, a valve station for supplying argon and nitrogen and a PLC (programmable logic controller) with an HMI (human machine interface), wherein the PLC controls the valve station and stores a plurality of bottom blowing models. The method comprises the followings steps: selecting a bottom blowing model; confirming; loading a flow set value; transmitting the flow set value; and monitoring smelting process. According to different nitrogen contents and carbon contents of a target steel type, 9 models are combined in the invention, production operation personnel select a corresponding model code only according to a steel type to be smelted, and the parameter and the curve data of the model are automatically downloaded to the PLC. Thus, in the invention, the phenomenon that production operation personnel continuously and manually adjust valve opening in the conventional production step is reduced, thus the operation intensity is lightened. The PLC automatically switches nitrogen and argon, controls stable intake pressure and adjustable branch pipe flow, has high control precision and strong degree of automation and lowers production cost.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for automatically switching between nitrogen and argon by PLC to control stable inlet pressure and adjustable branch pipe flow rate according to the difference between the nitrogen content and carbon content of the target steel type. Converter automatic bottom blowing control method. Background technique [0002] Top-bottom combined blowing converter (oxygen is blown at the top of the converter, and inert gas is blown at the bottom), the gas supply intensity of the bottom blowing system, that is, the control of the gas flow rate is the most critical control parameter of the system. The bottom blowing process runs through the entire smelting process. In order to reduce costs, nitrogen is often used instead of expensive argon, which requires switching between the two gases in some smelting processes. Smelting different steel types requires switching be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34
Inventor 魏国建张泽永李占国
Owner BEIJING JIANLONG HEAVY IND GROUP
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