A precise control method for high-efficiency denitrification ammonia flow

Abstract

The invention discloses a precise control method for high-efficiency denitrification ammonia flow, which determines the operating state of the boiler according to the unit load command and variable load rate: when the unit is operating in a variable load state, the fuzzy control system is invoked; when the unit is operating in a constant load state, Call for an improved cascade control system. The invention introduces the chimney analysis instrument data into the control system to ensure that the assessment of environmental protection and denitration is up to standard, and introduces a fuzzy control method and a data preprocessing mechanism to solve the problem of large lag in the current control system and the problem of low system control accuracy when CEMS data has bad points. Thereby, the control quality of the denitration control system is improved, and it is suitable for high-efficiency denitration. The invention can effectively solve the problem of large lag in the SCR denitrification process, the problem of low system control accuracy when CEMS data has bad points, and the difficulty in debugging the advanced denitrification control system, low reliability, and the need for real-time calculation and update of parameters. Problems suitable for engineering applications.

Description

technical field [0001] The invention belongs to the technical field of environmental protection denitrification, and in particular relates to a method for precisely controlling the flow rate of highly efficient denitrification ammonia. Background technique [0002] SCR denitrification refers to the use of amino reducing agents to "selectively" react with NOx in the flue gas under the action of an appropriate reaction temperature window and a catalyst to generate harmless N 2 and H 2 O. SCR denitrification of thermal power units adopts high-dust arrangement, and the reaction temperature range is 320°C to 420°C. SCR denitrification has become the most mature and widely used flue gas denitrification technology for thermal power plants due to its high denitrification efficiency, stable and reliable operation, and no secondary pollution of products. [0003] The current common SCR denitrification closed-loop control strategy adopts a fixed SCR outlet NOx concentration control ...

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Problems solved by technology

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a precise control method for high-efficiency denitrification ammonia flow, which can effectively solve the problem of large lag in the process of SCR denitrification, the problem of low system control accuracy when CEMS data has bad points, and the problem of advanced denitrification The control system is difficult to debug, the reliability is low, and the parameters need to be calculated and updated in real time, which is not suitable for engineering applications.

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