KR100518320B1 - A method of weighing the Slag coating method of the basic oxyzen converter by using the retained slag weighing system - Google Patents

Abstract

The present invention is to determine the amount of secondary raw materials to be input to the slag coating material during the converter process for steelmaking in the converter by the slag amount during the excavation work of the converter, the slag amount generated during the drilling, and the slag amount discharged during the slapping or tapping. It relates to a method for measuring the amount of remaining slag.

According to the present invention, it is possible to accurately measure the amount of slag remaining in the converter to accurately measure the input amount of sub-materials, and by using this, it has the effect of improving the slag coating quality to improve the life of the refractory of the converter.

Description

A method of weighing the slag coating method of the basic oxyzen converter by using the retained slag weighing system}

The present invention relates to a method for measuring residual slag in a converter, and more particularly, the amount of slag excreted during the excavation work of the converter in order to obtain the amount of secondary raw materials input to the slag coating material in the converter process for steelmaking, the amount of slag generated during drilling It relates to a method for measuring the amount of slag remaining in the converter by the amount of slag flowing out during the slope or tapping.

FIG. 1 shows a schematic diagram of an existing converter steelmaking process. The converter steelmaking process will be described in detail as follows.

When molten iron and scrap are charged into the converter to blow impurities into the molten iron and scrap to remove impurities, slag is generated and slag and converter refractory react to react. Happens. In order to suppress the melting of the refractory and to improve the life of the converter refractory, after the end of the tapping work, a proper amount of slag is left in the converter, and dolomite or light dolomite, which is an auxiliary material, is added to secure the viscosity of the slag, and then the slag is converted into the converter refractory. Slag coating is applied.

At this time, the quality of slag coating is determined by the amount of slag attached to the converter refractory, the amount of slag attached is determined by the viscosity of the slag, the viscosity of the slag and the amount of slag remaining It is determined by the amount of subsidiary material injected.

Therefore, in order to ensure proper viscosity, the temperature of the slag must be controlled, and in order to control the temperature, the amount of slag remaining inside the converter must be accurately measured and the amount of coolant added accordingly is calculated. As a result of estimating the amount of slag remaining in the converter, since the coolant is added, the slag coating has a non-uniform problem.

In the present invention to solve the problems of the prior art, an object of the present invention is to accurately measure the amount of slag remaining in the converter to uniform the slag coating in the converter.

In addition, another object of the present invention is to accurately calculate the amount of slag remaining in the converter to calculate the amount of secondary raw material input to the converter.

Residual slag measurement method in the converter of the present invention, the step of calculating the slag generation (W _product ) during the blowing operation of the steelmaking process; Inputting an amount of slag (W _slopping ) leaked by the slope during the drilling operation; Inputting a slag amount (W _carryover ) leaked during the tapping operation; Measuring the slag amount (W _slag-off ) _excreted in the slag pot during the excavation operation; Inputting the amount of slag (W _pre-retained ) remaining last time; And extracting the amount of slag (W _retained ) remaining in the converter by the following equation.

Specific configuration and operation for achieving the above object of the present invention will be described in detail below with reference to the drawings.

Specific embodiment of the method for measuring the residual slag in the converter of the present invention, as shown in Figure 3, after charging the molten iron and scrap metal in the converter performs the converter blow operation (S100).

At this time, the slag generation amount (W _product ) generated during the blowing operation is a value calculated by the converter operation calculator, is extracted by the following equation (1). (S110).

Where the loss ratio is the rate at which the slag is not slammed at each input

MW _MxOy : molar weight of metal oxide, MW _M : molar weight of metal oxide,

The content of seonjung M,: _{i-W flux:} amount of the line _(pig),% M pig: amount of flux i, W _pig

% M _{end point} : M content in molten steel after converter blow

In addition, the amount of slag (W _slopping ) leaked by the slope during the drilling operation is obtained by inputting the value depending on the livestock of the operator (S120). In addition, when a large slope occurs, the error range is minimized by complete exclusion after completion of the blow. Subsequently, the tapping operation is performed (S200), and the slag amount (W _carryover ) flowing out during tapping is calculated (S210). Here, as shown in FIG. 1, the exclusion is slag injured on the molten iron surface after the tapping operation. Means to remove it. However, in the exemplary embodiment of the present invention, 800 kg may be set as a default value when the dart is used as the amount of slag (W _carryover ) leaked into the ladle during tapping.

When the tapping work is completed (S220), the excavation work is performed, and the slag amount (W _slag-off ) to be _excluded in the slag pot during the excavation work (S300). In one embodiment of the present invention, the slag amount (W _slag-off ) is installed in the slag bogie load cell to measure the displacement amount during the excavation of the converter. Slag amount (W _retained ) remaining in the converter is extracted by the following equation (2) (S400).

(2)

Here, the amount of slag remaining last time (W _pre-retained ) is a value measured by the amount of slag remaining in the previous process. However, when slag is completely excluded last time, it has a value of "0".

Subsequently, using the amount of residual slag calculated in the system using the method of measuring residual slag, the steelmaking processor computer calculates the coating subsidiary material according to the following formula (4) (S500), and transfers the calculated subsidiary material amount to the PLC. Subsidiary materials are automatically weighed and added (S510, S520).

In addition, the processor computer calculates the amount of residual slag to suppress the slapping according to the information of the molten iron and provides the information to the road workers. To reset.

Here, the method of calculating the dosage of the slag coating material is performed as follows.

The slag temperature remaining after the first blown is about 1600 ~ 1640 ^O C level, the slag viscosity is about 0.1 ~ 0.6 poise. Referring to FIG. 4, it can be seen that the viscosity of the slag increases as the temperature of the slag decreases, and in particular, the viscosity of the slag increases sharply near the melting point of the slag.

To reduce slag temperature, the sensible heat of slag should be removed. Equation (3) below shows a decrease in the temperature of the system due to the temperature rise of the raw material, which is a result of the heat balance effect due to chemical reaction (endothermic reaction) and heat of dissolution of the raw material.

When dolomite or limestone is added to control the temperature according to Equations 3 and 1, the endothermic reaction may be utilized by the temperature strengthening by firing or the reduction of iron oxide by coal or coke injection. .

The amount of secondary raw materials to be input in order to reach the target slag temperature in Equation (3) is represented by Equation (4), where the mole of slag remaining in the converter using thermodynamic data such as heat capacity. (mole) number was correctly weighed and calculated.

Where N _slag : mole number of slag, N _flux : mole number of injected flux,

Cp _i : heat capacity of i, T: temperature, DH: enthalpy change

By using the retained slag weighing system of the converter of the present inventors it was possible to accurately measure the amount of slag remaining in the converter to accurately measure the input of the feedstock, by utilizing this to improve the slag coating quality It has the effect of improving the life of the refractory.

FIG. 1: Schematic diagram of converter steelmaking process

2: Schematic diagram of converter residual slag measuring system

3: Process Diagram of Residual Slag Measuring System

Figure 4: Changes in Slag Viscosity with Temperature in Slag

FIG. 5: Slag Management Screen in Slag Rejection Work

Figure 6: Variation in Exhaust Volume in Slag Ports due to Exhaust

       * An explanatory diagram of the main parts of the drawing

        201: Process computer

        202: personal computer

        203: wireless data receiving system

        204: data wireless transmission system

        205: load cell

        206: load cell signal converter

        207: slag pot transfer car

        208 slag red beans

        209: Converter

        211: converter slag

        212: Operator displayer

        213: Operator

Claims (5)

Calculating slag generation (W _product ) during the blowing operation of the steelmaking process; Inputting an amount of slag (W _slopping ) leaked by the slope during the drilling operation; Inputting a slag amount (W _carryover ) leaked during the tapping operation; Measuring the slag amount (W _slag-off ) _excreted in the slag pot during the excavation operation; Inputting the amount of slag (W _pre-retained ) remaining last time; And The method of measuring the residual slag in the converter consisting of extracting the amount of slag (W _retained ) remaining in the converter by the following equation. The method of claim 1, wherein the slag generation amount (W _product ) is characterized in that extracted by the following equation Where the loss ratio is the rate at which the slag is not slammed at each input MW _MxOy : molar weight of metal oxide, MW _M : molar weight of metal oxide, The content of seonjung M,: _{i-W flux:} amount of the line _(pig),% M pig: amount of flux i, W _pig % M _{end point} : M content in molten steel after converter blow According to the claim 1, wherein by the amount of slag remaining in the converter (W _retained) with the further step of the additives for the coating slag extracted from the following equation. The method according to claim 1, wherein the amount of slag previously _retained (W _pre-retained ) has a measured value or “0” due to complete exclusion at the previous time. The method of claim 1, wherein the slag amount (W _slag-off ) is _excluded The method characterized in that the load cell is installed in the slag bogie to measure during the excavation of the converter.