SU1302444A1 - Method of controlling electric conditions of electric-arc furnace - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the productivity of the furnace by accelerating the melting period. In the process of melting the charge, the duration of melting of the charge, the flow rate of the elec- tive, are recorded. troeners for this period determine the bulk density of the charge. The electric mode of the furnace is set at the beginning of the melting period by maintaining the max. coefficients irradiance of the lining until power consumption W does not reach the value W 2.368JS x X (p - 17.95) + 188.48 (kWh / t), where. f is the numerical value of the bulk density of the charge in t / m, then switches to the mode of maintaining the max. STI arc. 1 tab. with power (L o: About to 4 4 4

Description

The invention relates to an electric term and can be applied in metallurgical plants operating electric arc furnaces.

The aim of the invention is to increase the productivity of the furnace by accelerating the melting period.

The method was tested in a series of experimental heats on a DSP-100NZA furnace.

The magnitude of the bulk density of the charge has a significant effect on such performance indicators of the furnace installation as the melting time, the mass melting rate, the diameter of the resulting well, etc.

When a mixture with a low bulk density (light weight) is loaded into the furnace, the melting period is characterized by a high melting rate of the metal in the arc burning zone and the rapid lowering of the electrodes in relatively narrow wells. At the same time, in order to increase the mass melting rate of the metal and form a common well, it is necessary to increase the part of the energy introduced

195 183 170 155 140 180 180 155 155 145 130 155 155 145

1.9

1.8

1.7

1.75

1.8

1.7

1.67

1.6

1.65

1.7

1.6

1.5

into the furnace by radiating the arc, i.e. set and control the electric mode of operation of the furnace, corresponding to the maximum irradiance coefficient of the lining. According to Mepis, the increase in veltgain of the bulk density of the charge part of the heat that must be introduced into the furnace during the period of melting due to the radiant energy of the arc decreases accordingly, since at the weight of the body material, due to its high thermal conductivity, it is necessary to increase the input of thermal energy under the arc to achieve the enthalpy required for melting metal, i.e. change the setting of the electric mode of operation in the direction of the maximum arc power.

In the smelting process, the duration of the melting of the charge and of the entire melting, the power consumption during the period of melting of the charge — and the entire melting were recorded. Comparative data on the melts held in the table.

,one

449

395,583,555,572,587,571,549,540,545,556,551,537

Table continuation

. The best electric mode for introducing energy into the working volume of the furnace is the mode in which the bulk density of the charge is determined, then at the beginning of the melting period the electric mode of operation of the furnace is set according to the maximum irradiance coefficient of the lining and controlled until the specific power consumption:

V 2.368 R (I-17.95) + 188.48,

where W is the specific energy consumption, kWh / t; p is the numerical value of the bulk density of the mixture, t / m, pos

The setting of the electric mode of the furnace is changed in the direction of the maximum arc power.

The application of the proposed method of controlling the electric mode of a steel-smelting arc furnace will allow an increase in the productivity of the furnace installation due to more efficient use of the electricity introduced into the furnace and reduction of the melting time.

Editor L. Langazo Order 1225/56

Compiled by O. Turpak

Tehred L.OleinikKorrektor M.Pojo

Circulation 802. Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

J5

3024446

Claims (1)

Formula from 1 The method of controlling the electric mode of an electric arc furnace, during which the electric parameters of the arc, the irradiance coefficient of the lining and the specific energy consumption are controlled during the period of melting, and when the last parameter reaches the specified value, the task is switched to the electric mode control of the furnace to the fact that, in order to increase the productivity of the furnace by accelerating the melting period, until the moment of switching, the tasks are maintained the maximum irradiance coefficient of the lining, in addition ten control the bulk density of the charge loaded into the furnace, and the specified value of the specific energy consumption is determined by the formula W. 2.368f (p- 17.95) + 188.48, where W is the specific consumption of electricity, hyi, kWh / t; J - bulk density of the mixture, t / m,