A denitrification reducing agent addition control method and control device based on time difference matching

Abstract

The invention relates to a denitration reductant adding control method based on time difference matching and a control device of the control method. By setting in-situ real-time test points, measuring corresponding parameters and depending on actual characteristics of a catalytic deoxidizing reaction of a denitration device, the time difference of flue gas from a flue gas flow speed and flow rate test point to an ammonia spraying region when the flue gas amount and the concentration of pollutants are changed, and the time difference between ammonia / air for spraying into a grating are mainly calculated, so that synchronous non-time-difference mixing is achieved; meanwhile, the flow speed of front nitric oxide and the flow speed of flue gas are taken as feedforward parameters, the concentration of sprayed and mixed nitric oxide and ammonia is taken as the feedback variable, the weight ratio of the feedforward to the feedback is reasonably set and adjusted, the reductant and the nitric oxide after mixed in flue gas react based on set efficiency before entering the denitration device, the amount of ammonia / nitrogen is rapidly and timely adjusted and matched and flexibly controlled under the working conditions such as various change amplitudes and wild fluctuations, the problem of adverse effects caused by the denitration device, a unit and the like is solved, and a significant effect of promoting pollution reduction is achieved.

Description

technical field [0001] The invention relates to the technical field of reducing agent addition control in the technical field of selective catalytic reduction and denitrification in thermal power unit or boiler flue gas, in particular to a denitrification reducing agent addition control method based on time difference matching and a control device thereof. Background technique [0002] Flue gas denitrification by selective catalytic reduction method is the most widely used denitrification technology in thermal power units and cement and steel industries. It has a series of advantages such as high denitrification efficiency and small secondary pollution, so it is widely used at home and abroad. However, with the increasingly higher requirements of environmental protection standards and the stricter environmental requirements of the public, higher requirements are put forward for the original flue gas denitrification system. [0003] The high-temperature flue gas in the flue g...

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Problems solved by technology

[0004] In order to solve the problem that the concentration of pollutants or flue gas fluctuates greatly and violently, as well as changes in conventional lifting loads, the addition of reducing agent and its change cannot be matched and controlled in time, and at the same time realize the molar ratio of reducing agent ammonia and nitrogen oxides Control, reducing the large delay and thick line control in the conventional control method, the present invention provides a denitrification reducing agent addition control method and its control device based on time difference matching

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