All-working-condition self-adaptive pH adjusting system

Abstract

The invention discloses an all-working-condition self-adaptive pH adjusting method which comprises the following steps: 1, collecting data, selecting DCS historical data, exporting the DCS historicaldata to a CSV format file, and arranging the exported data according to a time sequence, 2, screening and cleaning data, 3, performing modeling analysis on the screened and cleaned data table to obtain a dynamic pH expected value model, 4, according to the flue gas mass flow monitored in real time and the number of in-operation circulating pumps, calculating the pH value of the corresponding dataset online through a dynamic pH expected value formula, and carrying out pH adjustment in real time. According to the full-working-condition self-adaptive pH adjusting method, accurate control over the desulfurization pH value under the full-load working condition can be achieved, and the defect that in traditional PID control, the set value is manually adjusted by an operator according to the real-time working condition is overcome, the problem of automatic and accurate matching of the pH value set value according to the real-time operation condition is solved, compared with a traditional PHvalue adjusting mode, limestone consumption can be reduced, and the purpose of reducing consumption is achieved.

Description

technical field [0001] The invention belongs to the technical field of pH adjustment, and in particular relates to an adaptive pH adjustment method for all working conditions. Background technique [0002] At present, the pH adjustment of the slurry in the absorption tower of the desulfurization unit is basically based on the traditional DCS control technology, using cascade PID control. By adjusting the amount of limestone slurry supplied to match the SO2 load of the inlet flue gas, the set value of the pH value is determined by the operating personnel. The operating state is artificially set to achieve pH control. [0003] However, the existing control mode cannot adapt to the stable adjustment of the pH value under full load conditions and the boiler’s rapid load lifting and lowering because the pH setting value needs to be set manually, which often leads to the automatic pH value adjustment system overriding and disconnecting; now There is a control mode that does not t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive pH adjustment method for all working conditions, so as to solve the problem that the existing control mode in the prior art cannot adapt to the full-load working condition, and the stable adjustment of the pH value when the boiler quickly lifts and lowers the load. Lead to the overrunning of the pH value automatic adjustment system; the existing control mode does not take into account the technical problem of the impact of the number of absorption tower circulation pumps on the slurry pH value; the preferred technical solution in the many technical solutions provided by the present invention can produce Many technical effects of

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