METHOD OF CONTROL OF MULTIPLE-EFFECT EVAPORATOR WITH NATURAL CIRCULATION HEAD EVAPORATOR Russian patent published in 2012 - IPC G05D11/00 B01D1/26 

FIELD: machine building.

SUBSTANCE: method of control of multi-effect evaporator with natural evaporation head evaporator includes measurement and regulation of consumption of the initial solution and steam in the heating chamber and in the mortar space of the head evaporator and the boiling temperature of the solution, and the pressure of heating steam and the temperature of the solution at the outlet of the heating chamber of head evaporator are measured, based on the pressure of heating steam the temperature of its saturation and the difference between it and the solution temperature at the outlet of the heating chamber Δt₁ is calculated, as well as the difference between the temperatures of the solution at the outlet of the heating chamber and the bioling temperature of the solution Δt₂. With that, if Δt₁ reduces to the value mentioned, e.g. 5°C, then the steam is supplied to the mortar space with consumption, corresponding to the amount of steam passing through the 0.3 section of the pipe during 1-2 minutes, if Δt₂ decreases to the value lower than specified, e.g. to 3°C, the steam is supplied to the mortar space with consumption, corresponding to the total cross section of the pipe, and after reaching the setpoint value, e.g. 5°C the steam supply is stopped.

EFFECT: method enables to stabilise the operation of the apparatus, to increase plant efficiency and reduce the steam consumption for evaporation.

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