METHOD FOR AUTOMATICALLY CONTROLLING CRYSTALLIZATION PROCESS IN A MULTI-BODY EVAPORATOR AND DEVICE FOR CARRYING IT OUT Russian patent published in 2018 - IPC B01D1/26 B01D9/02 G05D27/00 

FIELD: biochemistry.

SUBSTANCE: inventions relate to isothermal crystallization of salts from solutions, more precisely to the methods and devices of control systems for crystallization processes in evaporative plants. Method for automatically controlling the crystallization process in a multi-hull evaporator, for example, for production of table salt, includes maintaining and correcting the set ratio of “initial solution flow rate – heating water flow”, depending on the concentration of the solid phase in the evaporated suspension, determined by the ratio of the specific conductivity of the slurry and its temperature, while the pressure in the separator of each housing of the multi-body evaporator is measured, and the value of the concentration of the solid phase in the evaporated suspension is determined by the expression where β – volume fraction of non-conductive solid phase in suspension; χ_l – specific electrical conductivity of the liquid phase of the evaporated suspension, S/cm; χ_c – specific electric conductivity of the evaporated suspension, S/cm; K – coefficient, the value of which depends on the shape of the solid particles in the evaporated suspension, for example, for spherical particles k = 0.5. Additionally, the functional relationship between the temperature of the evaporated suspension and the specific electrical conductivity of the liquid phase of the evaporated suspension is determined during the start-up of the installation by mathematical processing by the computer device of the joint measurement results management system in each case the boiling point of a saturated solution and its specific electric conductivity at the instant of equality of the measured boiling point of the solution to the value of the temperature, which is calculated by expression, for example, for table salt T = -0.0012P² + 0.5487P + 65.978, where P is pressure in the separator of the evaporator, kPa; T – boiling point of a saturated solution, °C. Device for performing a method for automatically controlling the crystallization process in a multi-body evaporator.

EFFECT: technical result is an increase in the accuracy of maintaining the concentration of the solid phase in the evaporated suspension and improving the reliability of the device.

3 cl, 1 dwg