All-working-condition self-adaptive pH adjusting method

Abstract

The invention discloses a full-working-condition self-adaptive pH adjusting method which comprises the steps: step 1, collecting data, selecting DCS historical data, exporting the data to a CSV format file, and arranging the exported data according to a time sequence; step 2, screening and cleaning the data; step 3, performing modeling analysis on the screened and cleaned data table to obtain a dynamic pH expected value model; and step 4, according to the flue gas mass flow monitored in real time and the number of circulating pumps in operation, calculating to obtain the pH value of the corresponding data set 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 under the real-time operation working condition is solved; and compared with a traditional pH value adjusting mode, the limestone consumption can be reduced, and the purpose of reducing consumption is achieved.

Description

Technical field[0001]The present invention belongs to the field of pH adjustment technology, and more particularly to a full-working condition adaptive pH adjustment method.Background technique[0002]At present, the desulfurization device absorbs the pH adjustment of the tower slurry, which is basically based on conventional DCS control technology. The cascade PID control is used to adjust the weight of the limestone and the entrance flue gas SO.2The load matching, the setting value of the pH has the operator to implement the control of the pH according to the operating status person.[0003]However, existing control mode requires human setting due to pH settings, and does not adapt to full load conditions, as well as the stable adjustment of pH value when the boiler is rapidly lifting, which often causes the pH to automatically adjust the system. There is also a control mode that does not take into account the number of absorbent tower circulating pump running stations for the pH valu...

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, 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 the load. Resulting in the overrunning and unloading 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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