SU1703708A1 - Method of control of pelletizing process - Google Patents

Abstract

This invention relates to the steel industry. The purpose of the invention is to improve the quality of suitable raw pellets. When the concentrate or its moisture content dispensed into the mixture changes, the change in the water supply is performed stepwise, each step is entered after the charge passes through the pelletizer or before the beginning of the oscillatory process of the yield of raw pellets, after which the water flow is changed to the opposite of the last step, those. decrease, if the water flow rate increases (and vice versa), and stop the change in the water supply, or until the desired moisture content of the charge is reached. 3 il. Yo

Description

This invention relates to the steel industry.

The purpose of the invention is to improve the quality of suitable raw pellets.

FIG. 1 and 2 are a flowchart of a method for controlling a pelletizing process; in fig. 3 is a block diagram of an apparatus for implementing the method.

The method of controlling the work process is carried out according to the following program (Figs. 1 and 2).

Block 1 enters the initial data: concentrate consumption (qK). moisture concentrate (WK), water consumption in barzban-pelletizer (qB), consumption of suitable raw pellets (qco).

Unit 2 compares the consumption of suitable raw pellets with a given consumption value (qco3).

Unit 3 compares the module of the flow rate of usable raw pellets (Dc | c0) from

q acceptable value (Acjco).

If the deviation module does not exceed the specified value, the algorithm stops working, otherwise block 4 calculates the moisture content of the mixture (L / N) using the formula

q WK + 100 qB

Pk + Qe

which is compared at a given (W) (block 5).

Block 6 compares the moisture deviation modulus of the charge with the tolerance ().

If the deviation of the humidity of the charge does not exceed the permissible, the water consumption is changed by one step (D dst) depending on the sign D qco (block 9), otherwise

Wu

one

ABOUT

with

vj

About 00

case block 7 calculates the flow of water in the drum pelletizer (PB) by the formula

W2i - WK) qx

qBP 1b

ioo-w2,

block 8 calculates the deviation (D qe) of the current water consumption (quT) from the calculated qep, and block 10 determines the number of stages (n).

If the number of steps is less than 1, the water flow is changed by the value of A qe (block 15), and if it is greater than or equal to 1 (block 11), by the value of A qcr (blocks 13 and 14), having previously determined the sign Aqe (block 12), after through the transport time lag t (blocks 16 and 17), block 18 determines the current value of the flow rate deviation of the usable raw pellets from the target flow rate (A qco.

If the current deviation of the consumption of suitable raw pellets does not exceed the allowable or previous (blocks 19 and 20), the algorithm continues to change the flow of water to the pelletizer.

If the current deviation of the flow rate of suitable raw pellets exceeds the allowable and previous one, determined before the change in the flow of water to the pelletizer, this indicates the beginning of the oscillatory process of the yield of raw pellets. In this case, the algorithm sets the previous water consumption (blocks 21-23) and stops working.

A device that implements. The proposed method (Fig. 3) contains a moisture sensor 24 for wet pellets, the output of which, together with the output of sensor 25, concentrate moisture, weight gauges of concentrate 26, and suitable raw pellets 27, are connected to the input of computing device 28. The output of computer 28 together with the output of water meter 29 connected to the inlet of the water flow regulator 30, the outlet of which is connected to the inlet of the actuator 31 of the valve 32 of the pipe 33 of the water bybane-pelletizer 34.

The device can be implemented on the basis of the system of GSP devices and a microcontroller of the Remikont type.

The device works as follows.

Signals proportional to setting the humidity of the finished raw pellets with Za-sensor 24, humidity of the concentrate from sensor 25, humidity and consumption of the concentrate and the finished raw pellets from the weighing instruments of concentrate 26 and finished raw pellets 27, enter the computational input

device 28, which calculates the required water flow in the drum collector 34. compares it with the previously calculated water flow and generates a signal proportional to the algebraic sum of the previously calculated flow rate with the resulting deviation, the deviation being added stepwise with a time delay after each step or until given humidity, or before the start of the oscillating regime of the output of the finished raw pellets.

The signal from the output of the computing device 28 is fed to the input of the water flow meter 29, where it is compared with the signal from the water flow controller 30.

When the deviation of the signal from the output of the computing device 28 from the signal of the controller 30, the flow meter 29 outputs a signal proportional to this deviation by

the input of the actuator 31, which, by changing the position of the shutter 32, changes the water flow from the pipeline 33 to the drum collector 34 by one step, which eliminates the occurrence of the oscillatory process of the output of the finished raw pellets caused by an abrupt change in the water flow that took place in the prototype.

Thus, the application of the proposed method in comparison with the prototype improves the quality of suitable raw pellets.

Claims (1)

Invention Formula The method of controlling the pelletizing process, which involves measuring the flow rate and moisture content of the concentrate, and the effect on the flow rate of water to the pelletizer. characterized in that improve the quality of suitable raw pellets, additionally measure the flow of water into the drum pelletizer and the flow of suitable raw pellets, determine the set value of the flow of water into the drum drum. The flow of water into the pelletizer is affected by the results of a comparison of the measured value of the flow of water into the pelletizer with a predetermined value. Spochalo f Source input / g- Q calculation 24 28 FIG. five