Online detection and ammonia spraying optimization control method for SCR denitration catalyst

Abstract

The invention discloses an online detection and ammonia spraying optimization control method for SCR denitration catalyst. The online detection and ammonia spraying optimization control method for the SCR denitration catalyst includes that regulating boiler combustion conditions to perform an experiment, obtaining ratio data of several groups of flue gas oxygen amount, NH3 consumption amount and NOX removing amount which meet preset conditions, drawing a segmentation fitting straight line according to the ratio data, calculating the theoretical ammonia spraying amount of the corresponding working condition, accumulating the theoretical ammonia spraying amount and actual ammonia spraying amount under preset conditions, regulating the ratio k thereof regularly, and judging the catalyst performance reduction situation according to the deviation degree of the k from an initial ratio k0 corresponding to new catalyst; calculating the current theoretically demanded ammonia spraying amount according to the segmentation fitting straight line, the current flue gas oxygen amount and the NOx mass to be removed, after being corrected by the k value obtained through the newest calculation, using as a feed-forward command of an automatic ammonia spaying control system to optimize the automatic ammonia spraying regulating performance; using the theoretically demanded ammonia spraying amount as a reference value to set excessive ammonia warning value and protection value so as to avoid excessive ammonia spraying.

Description

technical field [0001] The invention relates to the technical field of SCR flue gas denitrification catalyst detection and automatic control, in particular to an online detection of SCR denitrification catalyst performance and an optimization method for automatic control of ammonia injection. Background technique [0002] The selective catalytic reduction (SCR) denitrification process is the NOx in the flue gas x with NH injected into the flue 3 After mixing, it enters the reactor and generates harmless N under the action of the catalyst 2 and H 2 O, thereby reducing NO in flue gas x content. [0003] In practical applications, a common detection method for catalysts is to remove part of the catalyst from the reactor, and use a detection device to detect the apparent activity, microstructure and surface deposits of the catalyst to evaluate the performance of the catalyst. Although this method has the advantages of comprehensive testing items and relatively accurate resu...

AI Technical Summary

Problems solved by technology

[0006] 1. There is no online monitoring method for the change of catalyst performance during operation, and it is not convenient to determine the timing of offline detection of catalyst;

[0007] 2. The performance change of the catalyst has a great impact on the adjustment performance index and denitrification efficiency of the automatic ammonia injection control system. The existing technology cannot calculate the theoretical demand for ammonia injection according to the performance change of the catalyst, and the ammonia injection volume cannot be calculated according to the theoretical demand. Optimize the automatic control system of ammonia injection and realize the functions of alarming the excessive amount of ammonia injection

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