SU466026A1 - Device for automatic regulation of the distillation column mode - Google Patents

Description

1 based on information from the raw material consumption sensor 5. The steam consumption regulator 9 through the steam supply valve 10 stabilizes the steam consumption to the heater 2 of column 1 based on information from the steam consumption sensor 8. Correction unit 11, receiving information from the level sensor 12 in the separator 4, converts it into a correction signal of a reference to the steam flow controller 9, which performs an additional adjustment of the steam flow to the preheater 2. The reflux flow regulator 14 through the reflux feed valve 15 stabilizes the reflux flow on the basis of info The flow meter from the reflux flow sensor 13 and the raw material consumption regulator 6. The benzene consumption regulator 17 through the benzene drain valve 18 from the separator 4 stabilizes the benzene consumption for nitration based on information from the benzene consumption sensor for nitration 16 and the raw material consumption regulator 6. Manual setting The benzene flow controller 17, depending on the composition of the feedstock fed to column 1, establishes a new benzene consumption value for nitration.

Information from the temperature sensor on the upper control plate 21 of column 1 enters positional regulator 20, which, when this temperature exceeds its maximum value, produces a discrete signal passing through the logic element 24, in the absence of a discrete signal from regulator 19 on it a control valve 27 passing an analog signal from the temperature sensor on the top plate 21 to the benzene flow controller 17. The regulator 17 through the valve for removing benzene 18 from the separator 4 reduces the consumption of benzene nitration, which increases the level in the separator 4, the change of which is transmitted through the level sensor 12 to the correction unit 11, which converts these changes into a task correction signal to the steam flow controller 9, which changes the steam flow to the heater 2 so that the temperature at the top control plate returned to its desired value. In a similar way, but with the opposite effect as described, the control circuit, consisting of a temperature sensor on the lower control plate 22 of column 1, passes;

position regulator 19, logic element 23, control valve 26. Position regulator 19 is activated when the temperature on the lower control plate becomes less than its minimum value.

When the temperatures on the lower and upper control plates do not go beyond the limits of the minimum or maximum values, there are no signals at the input of the element 25. The latter produces a discrete signal that turns on the reference valve 28 and passes the reference signal through itself, which enters the flow regulator

benzene 17.

When the temperature control circuit on the lower or upper control plates is working, there is no discrete signal at the output of logic element 25, task 28 is closed, and benzene flow controller 17 inputs signals from control valves 26 or 27.

Subject invention

An apparatus for automatically controlling the mode of a distillation column, comprising a raw material consumption sensor associated

through a regulator with a raw material supply valve, a steam flow sensor connected through a regulator to a steam supply valve, a reflux flow sensor connected via a regulator to a reflux supply valve, a benzene consumption sensor for nitration, connected via a benzene flow regulator to a drain valve benzene from the separator, the level sensor in the separator, temperature sensors on the upper and lower control plates, characterized by

so that, in order to optimize the process, it is equipped with a correction unit, connected to the level sensor in the separator and the steam flow controller, positional controllers connected to temperature sensors, logic elements, control valves, a reference valve, a benzene consumption torus, one of the inputs of which is connected to a raw material consumption regulator connected to the consumption regulator

phlegm.