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Control system for flue gas denitration based on mathematical model

A mathematical model and control system technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve the problem that denitration control cannot be predicted in advance and accurately control the amount of ammonia injection

Active Publication Date: 2015-09-23
陈亮
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a mathematical model-based flue gas denitrification control system to solve the problem that the denitrification control cannot be predicted in advance and accurately in the current control strategy based on PI and PID control algorithms. The problem of controlling the amount of ammonia injection

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  • Control system for flue gas denitration based on mathematical model
  • Control system for flue gas denitration based on mathematical model
  • Control system for flue gas denitration based on mathematical model

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Embodiment Construction

[0024] Below, will refer to the attached figure 1 , Attached figure 2 And image 3 , The detailed description is as follows in conjunction with the embodiments:

[0025] figure 1 In, the closed-loop transfer function is: , Where y pv (s) is the output state of the system, r sp (s) is the system setting, n(s) is the system disturbance, when the filter G f =1, assume that the process link G p , G m And G c Are stable, even G p ≠G m , As long as the controller gain G c (0) and model gain G m (0) is the reciprocal of each other, then control deviation: , , Which means that regardless of any deviation or disturbance, the system can still eliminate the static deviation after responding to the input deviation and disturbance, and realize the tracking of PV to SP. Therefore, the process mathematical model can be approximated to the field control law. The control process is as follows:

[0026] 1. The SP is input by the operator according to requirements;

[0027] 2. The ammonia inje...

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Abstract

The invention relates to a control system for flue gas denitration based on a mathematical model. According to the invention, the difference between the actual emission of a flue gas NOx and the theoretical emission calculated by a NOx model acts as a modified value of a NOx emission set value, then an inverse model of a controlled object is used as a controller, and a real-time control instruction of an ammonia injection actuator for the next step is calculated. Meanwhile, the control system is designed to be a following control system, and the NOx set value is realized by superposing a function of a boiler main control instruction and a function of the boiler total air volume through a manual operating instruction of the operating personnel, thereby solving a problem that denitration control cannot pre-judge or accurately control the ammonia injection amount in a control strategy based on PI and PID control algorithms at present.

Description

Technical field [0001] The invention relates to the field of automatic control, in particular to a control system for flue gas denitration based on a mathematical model. Background technique [0002] Nitrogen oxides (NO x ) Emission control is listed as the current focus of emission reduction in my country. In this context, newly installed thermal power generating units will be equipped with denitrification devices, and old units that have been built and put into production have also been retrofitted with SCR or SNCR denitrification systems. The selective catalytic reduction SCR process is a mature industrial denitration technology. Its principle is to selectively remove NO and NO under the action of a catalyst at a flue gas temperature of 300-400℃. x Reduce to N 2 , And almost no NH 3 And O 2 的oxidation reaction. Theoretically, by reasonably controlling the temperature of the reaction zone and the amount of ammonia sprayed, NH 3 While the escape volume is low, the denitrificati...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 陈亮
Owner 陈亮
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