RU88023U1 - DEVICE FOR CONTROLING THE PROCESS OF FELLING OF IRON-MINERAL MATERIALS - Google Patents

Abstract

The utility model relates to the processing industry and can be used for pelletizing bulk iron materials. The technical result of the utility model is to control the process of pelletizing, determining the strength characteristics of pellets, providing the operator with information about the progress of the pelletizing process in real time. The device for controlling the pelletizing process of iron ore materials contains a limestone batcher, a bentonite batcher, a charge moisture sensor, a concentrate humidity sensor, a pelletizer speed sensor, a charge batcher, a 7-9 mm pellet sensor, an ADC, a keyboard, a computer, an indication unit, a program memory unit, a memory unit user counter timer. The device allows you to control the process of pelletizing, in particular the operation of sensors and dispensers used in pelletizing, the strength characteristics of the pellets and the rate of pellet formation. 1 s.p. f-ly, 1 ill.

Description

The utility model relates to the processing industry and can be used for pelletizing bulk iron materials.

A known method of controlling the granulation process, in which to increase the yield of conditioned pellets, measure the content of large and small substandard fractions in the pellets and, depending on their ratio, control the rotation speed or the angle of inclination of the pelletizer to the horizon (USSR author's certificate No. 771176, class C22B 1 / 16, 1980). This method requires the simultaneous measurement of three classes of pellet fineness, and the control system has a large delay time.

It is also known that the optimization device for the charge preparation of iron ore materials before pelletizing (No. 37099, С22В 1/14, 2004), which determines the consumption of bentonite and limestone depending on the moisture content of the material being pelletized, is adopted as a prototype.

The disadvantage is that in real time there are no means to control the process of pelletizing and, as a consequence, degradation (mismatch) of the process of pelletizing and receiving pellets that do not meet the quality criteria of the finished product is possible.

The technical task of the utility model is to control the process of pelletizing, determining the strength characteristics of pellets, providing the operator with information about the progress of the pelletizing process in real time.

The problem is solved by the fact that in the device for controlling the process of pelletizing, containing humidity sensors of the concentrate and the mixture, batchers of bentonite and limestone, computers, ADCs, an additional pelletizer speed sensor, a batcher batcher, a granule sensor of 7-9 mm (0.8 of the size of raw pellets), keyboard, display unit, program memory unit, user memory unit, counter-timer.

The essence of the utility model is illustrated by drawings, where in Fig.1 shows a diagram of the device.

The device for controlling the pelletizing of iron ore materials contains a limestone batcher 1, bentonite batcher 2, charge moisture sensor 3, concentrate moisture sensor 4, pelletizer speed sensor 5, charge batcher 6, pellet sensor 7-9 mm 7, ADC 8, keyboard 9, computer 10 , display unit 11, program memory unit 12, user memory unit 13, counter-timer 14.

The device operates as follows. A survey of sensors 3, 4, 5, 7 and dispensers 1, 2, 6, controlled by a counter-timer 14, is performed 8 times per hour (intervals of 7.5 minutes). Keyboard 9 is designed to enter parameters characterizing the charge and concentrate, which change when used in the process of pelletizing materials with other characteristics. Information is fed through ADC 8 to computer 10, where the strength characteristics of the pellets obtained are calculated, the pelletization index is determined using a regression mathematical model of the pelletizing process control from the program memory 12. The calculation results are provided to display unit 11, which allows the operator to make decisions on process control pelletizing of iron ore materials. Also, the calculation results and readings taken from sensors 3, 4, 5, 7 and dispensers 1, 2, 6 are stored in the user memory unit 13 and allow reporting on the progress of the pelletizing process as necessary.

The determination of the strength characteristics of the pellets and the pellet formation index is carried out as follows.

The output factors characterizing the raw pellets obtained during the pelletizing process have the following notation:

y ₁ - dropping strength (the number of drops of a sample of the obtained product from a height of 200 mm before its destruction), times;

y ₂ - crushing strength, kg / pellet;

Y ₃ - output pellets air-conditioned size, t / h.

The input factors characterizing the mixture entering the pelletization are as follows:

x ₁ is the moisture content of the mixture W _W ,%;

x ₂ - Fe (iron content in the charge),%;

x ₃ - SiO ₂ (silica content in the charge),%;

x ₄ - CaO (limestone),%;

Input factors characterizing the iron ore material supplied to the granulation have the following notation:

x ₅ is the humidity of the concentrate W _K ,%;

x ₆ - the content of thin classes minus 0.053 mm,%;

x ₇ - flow rate P, t / h;

The factor characterizing the operation of the equipment, we denote

x ₈ - drum speed ϑ, rpm

The consumption of binders and hardening additives is denoted by:

x ₉ is the consumption of bentonite R _b , kg / t;

x ₁₀ - limestone consumption R _and , kg / t.

The factor characterizing the pelletization process is denoted by:

x ₁₁ - granules with a size of 7-9 mm, t / h.

Based on the introduced notation of factors, the regression mathematical model for controlling the process of pelletization is presented as follows:

drop strength:

crushing strength:

output of pellets of a conditional size:

Taking into account the introduced notation from sensors and dispensers that determine the main parameters of the process of pelletizing iron ore materials, the following parameters are obtained: x ₁ , x ₇ , x ₈ , x ₉ , x ₁₀ , x ₁₁ .

In turn, the operator manually sets the following parameters using the keyboard: x ₂ , x ₃ , x ₄ , x ₆ .

The result of the calculation according to expression (3) in the form k · y ₃ (the coefficient k is taken to be 0.1, since the mass of granules 7–9 mm is 1/10 of the pelletizing capacity) is compared with the value obtained from the pellet sensor 7– 9 mm, parameter x ₁₁ , i.e. the value of the indicator of granule formation is determined. The value of the indicator of granule formation, the values of the strength for dropping and crushing are displayed on the display unit, after which the operator decides whether it is necessary to influence the pelletizing process in any way. Also, the operator has the ability to control the operation of mechanical equipment by analyzing data taken from sensors and dispensers.

Claims (1)

A device for controlling the pelletizing process of iron ore materials, containing humidity sensors for concentrate and charge, bentonite and limestone dosers, computers, ADCs, characterized in that a pelletizer speed sensor, a charge batcher, a pellet sensor 7-9 mm, a keyboard, an indication unit, a memory block are additionally introduced programs, user memory, counter-timer, and the outputs of the humidity sensors of the concentrate, charge, pelletizer speed, batchers of limestone, bentonite, charge are connected to the inputs of the ADC, the output of which is connected to a computer, the output is a sensor 7-9 mm granules is connected with a computer, program storage units, user memory, display connected to the computer, the counter-timer connected to a computer.