Evaporation process discharge caustic alkali concentration measurement device accuracy compensation method

Abstract

The invention relates to an evaporation process discharge caustic alkali concentration measurement device accuracy compensation method. The evaporation process discharge caustic alkali concentration measurement device accuracy compensation method comprises the following steps of: S1, carrying out data acquisition, i.e., acquiring process data of an alkali liquor diopter, a temperature, a caustic alkali concentration instrument value and a laboratory value in the evaporating process; S2, carrying out data preprocessing, i.e., carrying out moving average filtering processing, timing matching andnormalization processing on the process data acquired in the step 1 so as to obtain the preprocessed process data; S3, inputting the preprocessed process data into a caustic alkali concentration measurement device accuracy compensation model to acquire a compensation value; and S4, adding the caustic alkali concentration instrument value with the compensation value so as to implement online compensation of caustic alkali concentration. According to the compensation method provided by the invention, the online instrument concentration value can be relatively accurately compensated, and the concentration value after compensation can follow up the tendency of an actual change; and measurement accuracy can meet the demand of actual production.

Description

technical field [0001] The invention belongs to the technical field of compensating a production parameter measuring device in an alumina evaporation process, and in particular relates to a method for compensating the accuracy of a caustic alkali concentration measuring device in an evaporating process. Background technique [0002] The caustic alkali concentration is the key process index of the alumina evaporation process, because the qualification of the caustic alkali concentration will directly affect the ratio of the alumina grinding process and the dissolution rate of the dissolution process, thereby affecting the final product of alumina production—— quality of alumina. Therefore, online detection of caustic alkali concentration is a very important task in alumina production. [0003] At present, there are usually two methods for detecting the concentration of caustic alkali. One is obtained by manual sampling and testing after the alkali solution is prepared in the...

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Problems solved by technology

Using these severely lagging information to guide production will easily lead to large fluctuations in caustic alkali concentration, low qualification rate of alkali solution, difficulty in controlling other processes, and ultimately lead to low quality alumina

The other is caustic alkali concentration online detection instrument, but these online instruments are expensive, and usually after the instrument is installed, its internal model parameters are fixed, because the raw ore composition used by domestic alumina enterprises fluctuates greatly, and the evaporation process conditions Complex and changeable, with the passage of time, the output value of the online measuring device may drift, the accuracy of the instrument will decrease, and the instrument manufacturer needs to invest a lot of money in maintenance, and the recalibration process is relatively cumbersome

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