SU1279667A1 - Method of controlling the process of joint grinding of charge component parts - Google Patents

Abstract

The invention relates to the field of automation of grinding processes. It can be used in the steel industry, building materials and glass production. It allows to improve the quality of grinding process control. To achieve this goal, the costs of the components of the charge, the filling of the mill of the grinding mixture and the content of a large class in each of the components before grinding are measured. The costs of all components and the component components with the highest content of a large class vary depending on the deviation of the filling of the mill with the charge from the specified value, and the set value of the filling of the mill is set to dependent-. ti from the weighted average of the content of a large class in the charge.

Description

The invention relates to the automation of grinding processes and can be used in ferrous metallurgy, lumbering of building materials, glass production.

The purpose of the invention is to improve the quality of control of the grinding process.

The essence of the method is as follows.

The main indirect indicator of the mill's operation is its filling. With optimal (the highest possible) filling, Tpet provides a bootable grinding quality and the lowest specific power consumption. The optimal filling may vary depending on the physicomechanical properties of the materials being ground, i and i the most important of which for grain size is particle size. As a rule, ball drum mills poorly grind material with a high content of particle size of 20–25 mm (this property is true for iron ores, coal, charge additives during the work of iron ore concentrates}.

The dependence is optimal,

full filling of the mill from the size of the crushed mixture. For this, the value of the large class of each component of the charge is measured continuously before grinding, as well as the consumption of each component of the charge in the mill.

Since the mixing of the components takes place directly in the mill drum, it is difficult to measure the content of a large class directly in the charge.

Therefore, the weighted average content of a large class is calculated by the formula

R.

.I: Q; P J

D Rsr

 Zlqi

weighted average content of a large class in the charge, dol .;

the content of a large class in the 1st component of the charge, dol .;

consumption of the th component of the charge, t / h;

the number of components of the charge.

Using the resulting value, - set the task to fill

Q; fr

15

thirty

796672

mills. If the content of a large class in the charge increases (the increase in the task for the floor is correspondingly reduced, otherwise the mill may overload and collapse, because in this case the critical point of its static characteristic through the feed consumption channel is filling to the left of the nominal (passport) value. For by reducing the content of a large class in the charge, the filling task can be set higher than the nominal one, since the critical point on the static characteristic in this case is to the right of the nominal full value of filling.

With this method of specifying filling, frequent deviations are not excluded.

25

neither the filling from the task, since the ratio of large classes of different components may vary over time (the value ofn may not change), and also, to a lesser extent, fluctuations in other physicomechanical parameters (for example, moisture, hardness) are observed, operating parameters (E: ary load, lining states, etc.). By

this provides for the ps deaning of the filling of the mill at a given value close to the optimum one and determined depending on the size

of the charge, by asymmetrically changing the costs of the components. When filling less than a specified value, component costs increase proportionally, and when filled more than a specified value, not all components are consumed, but only the consumption of 1-1 mt, larger in comparison with the others, as the most likely cause of overload. The proposed method is carried out

in the following way.

The costs of the components of the charge, for example, are measured continuously, by conveyor belts in measuring instruments, as well as by the content of a large class in the components using a device for controlling the particle size distribution of dry products.

A weighted average of a large class by form (l) is calculated, for example, using microprocessor technology.

Adjust the filling of the mill with the charge by varying the flow rates of the components using a standard automatic stabilization circuit. Establish the task for filling in the stabilization circuit by the setter.

The component with the highest content of a large class is selected by continuously comparing the values of the content of a large class in various components and by selecting the highest value, using, for example, a comparator on an operational amplifier.

If it is necessary to reduce the filling of the mill, the consumption of the component with the highest content of a large class is reduced, for example, by influencing the output signal of the regulator in the stabilization circuit on the actuator drive of the component.

The method makes it possible to increase the productivity of a mill (for example, a spherical ventilated type Sh-50A, a grinding additive into a mixture to produce iron ore deposits) by an average of 3–4%.

Claims (1)

The invention relates to the automation of grinding processes and can be used in the ferrous metallurgy industry, the bulk production of building materials, and the production of glass. The purpose of the invention is to improve the quality of control of the grinding process. The essence of the method is as follows. The main indirect indicator of the mill's operation is its filling. With optimal (the highest possible) filling, Tpet provides a bootable quality of grinding and the lowest specific power consumption. Optimal filling may vary depending on the physicomechanical properties of the materials being crushed, i and i the most important of which is the size for grinding. As a rule, ball drum mills poorly grind material with a high content of particle size of 20–25 mm (this property is true for iron ores, coal, commercial additives in the work of iron ore concentrates). To this end, the value of the large class of each component of the charge before grinding, as well as the consumption of each component of the mixture in the mill, is continuously measured. Since the mixing of the components occurs directly into the mill It is difficult to measure the content of a large class directly in the charge. Therefore, the weighted average of the content of a large class is calculated by the formula: I: Q; PJ ZlQi D Pcp: the weighted average of the content of a large class in the charge, US $. class in the 1 st component of the charge, USD, consumption of the th component of yours, t / h, the number of components of yours. Using the obtained value, set the task to fill 72 mills. If the content of a large class in the charge increases (the increase in the task for the floor is correspondingly reduced, otherwise the mill may overload and collapse, because in this case the critical point of its static characteristic through the feed consumption channel is filling to the left of the nominal (passport) value. For by reducing the content of a large class in the charge, the filling task can be set higher than the nominal one, since the critical point on the static characteristic in this case is to the right of the nominal With this method of specifying the filling, frequent filling deviations from the task are not excluded, since the ratio of large classes of different components may vary over time (the value Ofn may not change), and also, to a lesser extent, other oscillations are observed physicomechanical parameters (e.g., moisture, hardness), regime parameters (E: aromatic load, lining conditions, etc.). Therefore, it is provided that the mill is filled to a predetermined value close to the optimum and Food emom L depending on the size of the batch by varying asimmetr1- ary cost components. When filling less than a specified value, component costs increase proportionally, and when filled more than a specified value, not all components are consumed, but only the consumption of 1-1 mt, larger in comparison with the others, as the most likely cause of overload. The proposed method is carried out as follows. The costs of the components of the charge, for example, are measured continuously, by conveyor belts in measuring instruments, as well as by the content of a large class in the components using a device for controlling the particle size distribution of dry products. Calculate the weighted average of the large class of form (l), for example, using microprocessor technology. Adjust the filling of the mill with the charge by changing the costs of components using a standard automatic stabilization circuit. Set the task for filling in the stabilization circuit with the setpoint device. The component with the highest content of a large class is selected by continuously comparing the values of the content of a large class in various components and by selecting the highest value using, for example, a comparator on an operational amplifier. If it is necessary to reduce the filling of the mill, the consumption of the component with the highest content of a large class is reduced, for example, by influencing the output signal of the regulator in the stabilization circuit on the actuator drive of the component. The method makes it possible to increase the productivity of a mill (for example, a ventilated ball of the type Sh-50A, a grinding additive to the charge to produce iron ore deposits) by an average of 3–4%. The invention The method of controlling the process of joint grinding of components of your components, including measuring the costs of components and changing the costs of components before feeding them into the mill, characterized in that, in order to improve the quality of the control of the grinding process, iz. measure the grinding mill charge, measure the large class in each component before grinding, compare the measured values of the large class content in the various components, identify the component with the highest content of the large class and determine the weighted average of this class, and the change in the costs of all components in the increase side is carried out while reducing the filling of the mill with the grinded mixture below a predetermined value, changing the consumption of the component with the highest soda large class zhaniem toward reducing is performed by increasing the charge Chopping mill filling vsh1e setpoint and setpoint Chopping mill filling the charge set according to the weighted average of krupnogoklassa content in the mixture.