Primary brine calcium and magnesium ion content control and monitoring system and control method thereof

Abstract

The invention discloses a primary brine calcium and magnesium ion content control and monitoring system and a control method thereof, and relates to the technical field of primary brine treatment. The method is automatically controlled by a DCS control program, a two-alkali analyzer is used for measuring the content of sodium percarbonate and sodium percarbonate, filters are additionally arranged in front of a sodium hydroxide analyzer and a sodium carbonate analyzer respectively, accurate operation of the analyzers is guaranteed, the addition amount of sodium hydroxide and sodium carbonate is calculated through a DCS calculation module, the addition amounts of sodium hydroxide and sodium carbonate are automatically adjusted by using an adjusting valve, the salt proportion is adjusted according to the consumption amounts of sodium hydroxide and sodium carbonate, and the addition coefficients of sodium hydroxide and sodium carbonate are revised according to actual data by using online monitoring of calcium and magnesium in primary brine; when calcium and magnesium data are abnormal, the PLC automatic sampling function is started, and calcium and magnesium content analysis of single equipment is achieved.

Description

technical field [0001] The invention relates to the technical field of primary brine treatment, in particular to a control and monitoring system and control method for the content of calcium and magnesium ions in primary brine. Background technique [0002] The main equipment for industrial caustic soda production is an ion-exchange membrane electrolyzer, and the main raw material used is secondary brine. The main factor affecting the service life of the ion-exchange membrane electrolyzer is the content of calcium and magnesium ions in the secondary brine. The refining of the secondary brine is divided into two steps. That is, the first refining is primary brine, and the second refining is secondary brine. The second refining process adopts resin adsorption, and the operation effect is stable, but the resin adsorption capacity is limited, so the calcium and magnesium content of the primary brine directly affects the calcium and magnesium content of the secondary brine. The ...

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Problems solved by technology

The second step refining process adopts resin adsorption, and the operation effect is stable, but the resin adsorption capacity is limited, so the calcium and magnesium content of the primary brine directly affects the calcium and magnesium content of the secondary brine

[0003] The following problems exist in the refining of primary brine: 1. The content of calcium and magnesium ions in raw materials changes, and the delay in artificial sampling results in insufficient addition of refined preparations, and the content of calcium and magnesium ions in primary brine exceeds the standard

2. The content of over-alkali and sodium percarbonate in primary brine is analyzed manually, without online monitoring

3. Manually adjusting the addition of refined preparations results in frequent operations and poor accuracy

4. The equipment of Kai membrane or ceramic membrane is damaged, causing the content of calcium and magnesium ions to exceed the standard, and DCS operators cannot find out in time

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