Evaluation method of completion degree of flash evaporation process in alumina evaporation process

The invention provides an evaluation method of completion degree of flash evaporation process in alumina evaporation process, and belongs to the technical field of industrial automatic control application. The evaluation method comprises following steps: 1, alumina evaporation system real time process data is obtained; 2, it is determined that whether flash evaporation system feeding amount is ina normal working range of 450 to 650m /h, if the flash evaporation system feeding amount is in the normal working range, a step 3 is carried out, otherwise, the step 1 is repeated; 3, sodium aluminate solution boiling point increasing value delta' BPE is obtained based on data obtained in step 1; and 4, non-equilibrium fraction NEF is calculated based on boiling point increasing value delta' BPEobtained in step 3, and on-line real-time evaluation of the completion degree of flash evaporation process in alumina evaporation process is carried out based on the obtained NEF. The evaluation method is capable of realizing o