SU443668A1 - The method of automatic control of the process of obtaining edible salt - Google Patents

Description

one

This invention relates to the field of automatic control of chemical processes.

According to the main author. St. N ° 242126 discloses a method for automatically controlling the process of obtaining edible salt Extra, for example, in an open barometric type three-unit evaporation plant by maintaining a constant water temperature at the outlet of a barometric condenser by changing the flow rate of cooling water, a constant temperature of the brine at the outlet of the circulation loop by changing the flow steam, the stabilization of the level of the solution in the vacuum apparatus of the evaporator station.

In this case, the stabilization of the level of the solution in the apparatus of the station is carried out by changing the level of brine in the salt collector depending on the amount of vacuum in each apparatus.

The proposed method of automatic control of the process of obtaining edible salt, Extra, differs from the well-known one in that in order to improve the stabilization of the solution level in the apparatus, the brine level in the salt collector is changed depending on the change in atmospheric pressure with respect to

LRat

Mgde ARZt - change in atmospheric pressure;

p is the density of the solution; g - acceleration of gravity The drawing shows a schematic diagram of automatic control, where 1 is a vacuum apparatus; 2 - solution preheaters; 3 - codensor; 4 - salt collector; 5-8 - regulators; 9-11-executive mechanisms; 12-15 - setting devices; 16, 17 - temperature sensors; 18 - solution level gauge in the salt collector; 19 - atmospheric pressure sensor.

Automatic control of the process of obtaining edible salt Extra is carried out as follows.

The outlet temperature pz of the barometric condenser 3 is measured by the sensor 17 and is kept constant in accordance with the setting of the setting device 13 by the regulator 6, acting on the actuator 10, which changes the flow rate of cooling water supplied to the condenser.

The temperature at the outlet of the circulation circuit is measured by the temperature sensor 16 and is kept constant in accordance with the setting of the setting device 12 by the regulator 5, acting on the actuator 9, which changes the steam consumption.

 .UH. -

,,

The level of the brine in the salt collector is measured by the sensor 18 and is maintained equal to the setting of the setting point 14 of the regulator 7, acting on the recovery mechanism AND, which changes the flow rate of the brine iodized in the salt scale.

The level of brine in the salt collector varies depending on the change in atmospheric pressure and according to the pressure:

-g

where DRat is atmospheric pressure change;

p-solution density; g - acceleration of gravity

 BmoputjHtiia lap

1 o

-, T

. .. 443668

Subject invention

A method of automatically regulating the iroess of obtaining a lean salt "Extra but auth. St. Up to 242126, characterized in that, in order to better stabilize the level of the solution in the apparatus, the brine level in the salt blend is changed depending on the change in atmospheric pressure but the ratio:

D / g:.,

fg

change in atmospheric pressure;

mortar density; acceleration of power

e HuvecKaft Section