SU785258A1 - Control device for mean size of annealing products - Google Patents

Description

1 The invention relates to devices for automatically controlling the average size of pieces of material, their output from a rotary kiln, for example, to control the average size of pieces of hot cement clinker. It can be used to automatically control one of the indicators of the quality of firing - the average size of the granuloclinker. A device for monitoring the average size of the calcined products is known, comprising a grate cooler, air pressure sensors under and above the grates, and a measuring device l. A disadvantage of this device is low control accuracy, since a small part of the material flow coming out of the furnace is controlled. A device is also known for controlling the average size of firing products, mainly cement clinker, which contains an electric motorized grate cooler, veins, til tor , blow, pressure sensor, multiplication unit, dividing unit and measuring unit: 2. Radiating device 2. A disadvantage of this device is the low control accuracy due to the possibility of some controlled overflow or the emptiness of the working volume of the refrigerator. The purpose of the invention is to improve the accuracy of control. The goal is achieved by the fact that the device for control. . Medium sized firing products of predominantly cement clinker, containing an electric grate cooler, blow fan, pressure sensor connected the first filter and the quad is connected to one input of the block, multiplying, the other input of which through the serially connected converter and the second filter under The key is connected to the current sensor, the pressure sensor through the third filter is connected to one input of the manufacturing unit, the other input of which is connected to the output of the multiplication unit, and the output

the dividing unit is connected to the measuring instrument. :,

The drawing shows a schematic diagram of the proposed device.

The device comprises a grate hollow 1, an air flow sensor 2, a current sensor 3, an air pressure sensor 4, filters 5, 6 and 7 quad 8, a converter 9, a multiplier 1-0, a division block 11 and a measuring device 12.

The device works as follows.

The signals from sensors 2, 3, 4 are filtered from noise in filters 5, 6 and 7, and the signal from the filter b is fed to the input of the converter 9, the output of which is riponbpiifHbHajieH the amount of material on the lattice of the refrigerator. The output signal of the filter 5 is fed to the input of the quadrant 8. The signals from the outputs of the quadrant 8 and the converter 9 are multiplied in block 10 and the resulting signal is fed to the input of block 11, where the signal from the output of block 10 is divided by the signal from the output of filter 7.

The signal is proportional to the partial division from the output of block 11 pt to measuring device 12, the readings of which are proportional to the average size of the pieces of material exiting the furnace. When reducing the size of pieces of material, an increase in pressure occurs under the lattice of the refrigerator, since As the resistance of the layer V1en increases; The current of the Pig lattice dBigat as the sprinkling of clinker through the grates increases. This leads to an increase in the signal coming from sensor 4, and the readings of measuring device 12 decrease, which corresponds to a decrease in the average size of pieces of material. When the signal from the sensor 4 decreases, the readings of the device 12 change upwards. With an increase in the signal coming from sensors 2 or 3, the reading

instrument 12 increases, and when the signal from sensors 2 or 3 decreases, instrument 12 decreases; are coming.

Thus, the proposed device makes it possible to control the average size of the pieces with high accuracy and low operating costs, which increases the efficiency of control of the firing process in rotary kilns.

Claims (2)

1.Nelidov V.A. Continuous automatic control of cement grinding, Cement, No. 4, 1971, with. 10-11. . 2. USSR author's certificate No. 447598, cl. G 01 N 15/02, 1973 (prototype).