SU541481A1 - Device for automatic control of the gas fractionation column process mode - Google Patents

Description

one

The invention relates to the field of automatic control of the technological regime of a gas fractioning column and can be used in the refining and petrochemical industry in rectifying columns for the separation of binary and multicomponent mixtures of hydrocarbons.

A device for automatic control of a distillation column is known, which contains temperature sensors on control plates connected via temperature difference sensors to the heat supply regulator down the column 1 ..

It is also known a device containing temperature sensors on the control plates of the column, a switch unit, as well as a flow controller and an actuator installed on the coolant supply line to the column boiler 2. However, they do not provide accurate regulation of the rectification process and the quality of the product in the columns, where the control plate changes its location depending on the magnitude of the deviation

rejection of its nominal value.

The circuit of the invention is to improve the accuracy of the process control and improve the quality of the target product. This is achieved by the fact that the device is equipped with a coolant flow sensor, a multiplier, comparison blocks, a raw material flow sensor connected through blocks of comparison with a switching unit connected to the multiplier input, the output of which is connected to one of the coolant flow regulator inputs, the second input of which It is connected to the flow meter heat sensor ITEL.

The drawing shows a schematic diagram of the device

Claims (2)

The device consists of a raw material sensor 1 connected to the inputs of three comparison units 2-4, the outputs of which are connected to three inputs of the switching unit 5, three other inputs of which are connected to temperature sensors 6-8 on the control plates, and the output - to the multiplier 9 , the second input of the multiplier is connected to the manual setting device 10, and the output is connected to the input of the flow medium control 11 connected to the second input with the flow medium 1 sensor and the output is connected to the actuator 13 installed on the supply line of the heat carrier to the boiler 14, anny the column 15. The device operates as follows. At the nominal consumption of raw materials, the output signals of blocks 2–4 are equal to zero and the output signal of the switching unit 5, supplied to the input of multiplier 9, is also equal to zero. Therefore, the output of the multiplier 9, which determines the required flow rate of the coolant is equal to the optimal value that goes to the second input of the multiplier 9 in the form of a constant task from the manual setter 10. The output of the multiplier 9 enters the chamber, the task of the regulator 11, s of which the chamber is variable the output signal of the flow sensor 12 heat carrier. The output signal of the regulator 11 goes to the actuator 13 installed on the coolant supply line to the boiler 14. If the feed supply changes during the operation of column 15, the output signal of one of the comparison blocks 2, 3, 4 will become equal to one. In this case, if the current value of the raw material consumption is less than the nominal, the HON4 output signal of unit 2, equal to one, fed to the switching unit 5, connects the output of the temperature sensor 6 to the output of the unit 5, which leads to a correction of the output signal of the multiplier 9, the coolant flow rate regulator arriving at the input 11, which brings the current coolant flow rate in accordance with the target through the actuator 13. If the current value of raw materials consumption is more nominal, but less than 1.2O FHO, i.e. P = 1.2O, then the output signal of the unit 3, equal to one, fed to the switching unit 5, connects the output of the temperature sensor 7 to the output of the unit 5, which leads to the correction of the output signal of the multiplier 9 to the controller 11. If the current value of raw material consumption is greater than nominal and greater than 1.20 PHQNV, i.e., F ,, / 1.20, then the output signal of comparator unit 4 will become equal to one and, through unit 5, will provide an offset to the output of unit 5 of temperature sensor 8, which will to adjust the output of the multiplier 9, by stepping to the controller 11. Thus, this device improves the accuracy of the gas fractionation column and the quality of the product obtained by taking into account the change in the location of the cocktail plate and the dependence of the OTKj onenik of the disturbing effect on its nominal value. Apparatus of the invention for automatic control of the gas fractionation column process mode, comprising temperature sensors on the control plates of the column, a regulator of the flow rate of the heat carrier into the boiler, a switching unit, an actuator, characterized in that, in order to improve the accuracy of process control and improve the quality of the target of the product, it is equipped with a coolant flow sensor, multiplier, comparison units, a raw material consumption sensor connected through comparison units with a switching unit It is connected to the input of the multiplier, the output of which is connected to one of the inputs of the coolant flow controller, the second input of which is connected to the flow sensor of the coolant. Sources of information taken into account in the examination: 1. US Patent No. 258О651, 2О2-40, 1968. 2. For the number 2O08472 / 26 from 27.O3.74 on which the decision was taken to issue an author's certificate.