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A Control System of Flue Gas Denitrification 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: 2017-10-03
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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  • A Control System of Flue Gas Denitrification Based on Mathematical Model
  • A Control System of Flue Gas Denitrification Based on Mathematical Model
  • A Control System of Flue Gas Denitrification Based on Mathematical Model

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Embodiment Construction

[0024] Below, refer to the attached figure 1 , attached figure 2 And attached image 3 , describe in detail as follows in conjunction with embodiment:

[0025] figure 1 , its closed-loop transfer function is: , where y pv (s) is the system output state, r sp (s) is the system setting, n(s) is the system disturbance, when the filter G f =1, it is assumed that the process link G p , G m and G c are stable, even if G p ≠G m , as long as the controller gain G c (0) and the model gain G m (0) are reciprocals of each other, then control deviation: , , indicating that no matter there is 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 on-site control law. Its control process is as follows:

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

[0027] 2....

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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 mathematical model-based flue gas denitrification control system. Background technique [0002] Nitrogen oxides (NO x ) emission control is listed as the focus of emission reduction in my country at this stage. In this context, newly installed thermal power generating units will be equipped with denitrification devices, and the old units that have been put into operation will also be equipped with SCR or SNCR denitrification systems through equipment and process transformation. Selective catalytic reduction SCR process is a mature industrial denitrification technology. Its principle is to selectively convert NO and NO x reduced to N 2 , while NH hardly occurs 3 and O 2 oxidation reaction. Theoretically, by reasonably controlling the temperature of the reaction zone and the amount of ammonia injection, the NH 3 While the escape amount is low, the denitrification efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 陈亮
Owner 陈亮
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