SU388759A1 - AUTOMATIC CONTROL METHOD - Google Patents

Description

one

The invention can be applied in the chemical-metallurgical industry, for example, in the production of guitar tetrachloride and in other industries, for example, the chemical industry.

There is a known method of automatically controlling successively operating rectification and distillation columns by changing the feedstock feed.

A disadvantage of the known method is the impossibility of ensuring quality control of the supply of the raw material, since the expenditures of the target and intermediate products depending on the column conditions are not taken into account. Fluctuations in these costs change the level in the distillation column and, consequently, the consumption of “similar raw materials.

In order to increase the regulation of the proposed method, the supply of the feedstock is carried out depending on the algebraic sum of the target and intermediate flow rate signals and the level in the distillation column.

The drawing shows a diagram of the implementation of the method.

The flow rate of the intermediate product taken from the rectification column / after the dephlegmator 2 is measured by the flow sensor 3. Consumption of the target product, selected from the distillation column. 4 after the reflux condenser 5, is measured by the flow sensor 6.

The level in the DISTILLATION column is measured by the sensor 7.

The output signal of the adder 8 is the task of the feedstock consumption controller 9, where it is compared with the signal of the flow sensor W of the raw materials.

The regulator output controls a control valve in the feed line.

When the signals of the flow sensors of the intermediate 3 and target 6 products change, the output signal of the adder 8 takes on a new value, and the regulator 9 moves the valve regulator // until

sensor 10 does not match the output of the adder.

Thus, in the new state, the material balance is maintained between the arrival of raw materials in the column and the expenditure of products withdrawn from the column, which does not cause a significant change in the level. Small level fluctuations caused by accumulating flow measurement errors are compensated for by the sensor signal.

level 7 through adder 8 with minor changes in feedstock consumption.

Subject invention

Method for automatic control of sequentially operating rectification

and DISTILLATION columns by changing the feedstock supply, characterized in that, in order to improve the regulation, the feed of the raw materials is carried out depending on the algebraic sum of the target and intermediary flow signals and the level in the distillation column.

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