SU1589020A1 - Method of controlling anthracite thermal pretreament process in electric calcinator - Google Patents

Abstract

The invention relates to the production of electrode paste for electroreduction furnaces in the chemical industry, as well as ferrous and nonferrous metallurgy, and concerns the process control of the preparation of anthracite, which is the main component of the electrode masses. The aim of the invention is to improve the quality of the final product. The method of controlling the process of heat treatment of anthracite in an electrochlorinator includes measuring the amount of electricity consumed, calculating its specific consumption, determining the yield of thermoanthracite completely less than 1.2 g / cm 3, calculating the correction of the specific energy consumption according to the established dependence in case its value goes beyond the required value, the determination of the total specific energy consumption with a correction, and the adjustment of the heat treatment regime by changing the amount of unloading and / or electric power awns electrochlorinator. Using the proposed method of controlling the heat treatment of anthracite in an electrochlorinator will improve the quality of thermoanthracite by stabilizing its electrical resistivity, as well as the quality of the electrode mass obtained from it. 2 tab., 1 Il.

Description

The invention relates to the production of an electrode mass for electrodes of a mine-producing electric furnaces of the chemical industry, as well as ferrous and non-ferrous metallurgy, and concerns the process control of anthracite thermal preparation, which is the main component of the electrode masses.

The purpose of the invention is to improve the quality of the final product.

The drawing shows a block diagram intended for the implementation of the proposed method.

In the mine electrochlorinator 1 placed electrodes 2 and 3.

The control unit for the process of thermal preparation of anthracite includes a block 4 of determination in thermoanthracite of a material with a density of less than 1.2 g / cm unit 5 for calculating specific electric energy consumption, logic control unit 6, unit 7 for setting the unloading mode, unit 8 for controlling unloading, a weighting device 9, an electric calciner power control unit 10.

The signal from the active energy meter 11 goes to the unit 5 for calculating the specific energy consumption, where the signal from the output of the unit 9 arrives. The signal from unit 4 goes to the unit 12 for determining the correction value of the specific energy consumption. At the same time, if the content in the thermoanthracite of a material with a density of less than 1.2 g / cm is within the specified limits or the deviation of its value from the boundary

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the values of the specified limits do not exceed 0.25-0.3%, then the adjustment of the specific energy consumption is not required. If the content of material with a density of less than 1.2 g / cm in thermoanthracite used in the production of electrode mass with a resistivity of not more than 90 .. m - less than 4% or more than 9%, and less than 9% or more than 15% in thermoanthracite used in production the electrode mass with a resistivity of not more than 80x X10 ® Ohm-m, and exceeds the permissible boundary values from the specified limits, the mode is corrected and the signal from block 12 is fed to block 5, which determines the total specific energy consumption necessary to ensure the specified content in thermoanthracite material n Lot less than 1.2 g / cm1. The output of block 5 is connected to the input of logic control unit 6. The signal from block 6 affects either the change in power of the electroclimate using the mosch control block 10, which is connected with electrodes 2 and 3, or the change in discharge mode by means of block 7.

Example 1. Carried out on a 1500 kVA electrolytic calciner.

The electrochlorinator operated at a power of 800 kVA. Its capacity for calcined thermoanthracite was 840 kg / h, the calculated specific energy consumption in this mode was 950 kWh / t. The specified content in the thermoanthracite material with a density of less than 1.2 g / cm for the formulation of electrode mass with a resistivity of not more than 80-10 Ohm.m in the range of 9-15% (average 12%).

The process was controlled as follows.

Using block 4, the current content of the thermoanthracite of the material with a density of less than 1.2 g / cm was determined to be 8.3%. The signal from block 4 went to block 12, where the calculation of the correction value of the specific consumption of electrical energy was performed;

(.103 (, 018.10 (12-8.3): 66.8 kW / h / t.

The signal from block 12 was fed to the input of block 5, where the total specific energy consumption needed to provide the mode allowing to obtain the specified content in the thermoanthracite material with a density of less than 1.2 was calculated.

 + L 950 + 66.8 1016.7 kWh / t.

The signal from block 5 was fed to block 6, which puts the electrochlorinator in the required mode: the power of the electrochlorinator does not change, and the amount of unloading of thermoanthracite decreases to 816 kg / h.

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Other examples of the implementation of the method for controlling the process of heat treatment of anthracite in an electrochlorinator are summarized in table. one.

From tab. 1 that the use of the proposed method under production conditions allows improving the quality of thermoanthracite by stabilizing its electrical resistivity.

In tab. 2 presents data confirming the improvement of the quality of electrodes when using thermoanthracite in the composition of the electrode mass prepared by the proposed method (determination of the characteristics of electrodes obtained from electrode masses using thermoanthracite using the known and proposed control methods was carried out according to the methods and requirements of TU 113-25 -72-84).

Analysis of the data given in table. 2 shows that the introduction of thermoanthracite into the composition of the electrode mass without controlling the content of the fraction with a density of less than 1.2 g / cm at a given level adversely affects the performance characteristics of the self-burning electrodes, since it does not allow to obtain electrode masses with stable properties tensile strength.

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Claims (1)

Invention Formula The method of controlling the heat treatment process of anthracite in an electric wiper, including measuring the amount of electricity consumed, calculating its specific consumption and adjusting the regime of heat preparation by changing the amount of unloading and / or electric power of the electric calculator, in order to improve the quality of the final product, the value of the yield of thermoanthracite with a density of less than 1.2 g / cm, set its limit value and when the current value of this component deviates from the given o calculate the correction of the specific energy consumption according to the following dependence: where ak WITH" (Q-Q, adjustment value of the specific power consumption; coefficient of proportionality, depending on the quality and granular content of the material supplied to the electrochlorinator (, 015-0.02); - the specified content in the thermoanthracite material with a density of less than 1.2 g / cm is equal to 4-9% for the thermoanthracite used in the production of electrode mass with a specific electrical resistivity of not more than 90., and in lax 9–15% for thermoanthracite used in the production of an electrode mass with a specific electrical resistance not exceeding 80 × 10-Ω-m; current content in thermoanthracite of material with density less than 1.2 g / cm%, and determine the total specific energy consumption with regard to the amendment, according to which the mode is adjusted by changing the power consumed by the electrochlorinator, and when the last value is reached, equal to 0.6-0.9 of its active power, the mode is Corrected by changing the amount of discharge. 1.1 3.2 4.0 10.0 15.0 18.0 t a b l ii c a 1 table 2 100.7 93 85.9 78.5 75.4 65.0 21.1 21.6 22.4 23.3 20.6 15.1