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Multi-variable interval constrained estimation-based SCR denitration optimized control system and method

A technology of predictive control and optimal control, which is applied in the direction of controlling the mixing ratio of fluids at different temperatures, etc., can solve problems such as difficulty in obtaining satisfactory control effects, and difficulty in ensuring the economy and safety of power plants, so as to prolong life, reduce execution times, The effect of improving the response speed

Active Publication Date: 2016-06-22
SOUTHEAST UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the SCR denitrification system is a typical object with large inertia and large delay. At present, most SCR denitrification systems of thermal power units adopt the conventional PID cascade control scheme, which is often difficult to achieve satisfactory control effects; At the chimney inlet, there is a long distance from the SCR reactor outlet to the chimney inlet. Sometimes even if the NOx concentration at the reactor outlet reaches the emission standard, the NOx concentration will change at the chimney; in addition, in order to reduce the NOx The concentration is controlled at the set value, and the actuator operates frequently, which makes it difficult to guarantee the economy and safety of the power plant operation

Method used

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specific Embodiment approach

[0063] The specific implementation method comprises the following steps:

[0064] 1) Under steady-state conditions, the model W of the ammonia injection valve A4 is obtained through the step response test 01 (s), model W of SCR reactor A5 02 (s), and the model W from reactor A to the chimney outlet 03 (s), namely:

[0065]

[0066]

[0067]

[0068] 2) Determine the parameter K of the proportional regulator Pa =-0.3,K Pb =-0.3, calculate the total model W(s) of the NOx concentration value of the multivariable predictive control unit 2 to the chimney inlet 11 input end=[W 1 (s), W 2 (s)] T :

[0069]

[0070]

[0071] The calculation method of the B-side model is the same as that of the A-side;

[0072] And get the step response coefficients of the total model W(s):

[0073] a 11 (1),a 11 (2),...,a 11 (N 1 )=[00...0.3811];

[0074] a 12 (1),a 12 (2),...,a 12 (N 2 )=[00...0.3811];

[0075] 3) Set the relevant parameters of the variable predictiv...

Embodiment 1

[0082] The comparison of the control effect of the SCR denitrification system based on the multivariable interval constraint predictive control of the present invention and the control effect of the PID controller obtained in Example 1 figure 2 , image 3 with Figure 4 As shown, the NOx control point of the present invention is at the chimney inlet, while the general PID control takes the NOx at the outlet of the SCR denitrification system as the controlled quantity, and the NOx concentration from the SCR outlet to the input end of the chimney inlet will change, so it can be seen from the figure To, the NOx of the chimney inlet input end under PID control does not reach the set value, and the multivariable interval constraint predictive control of the present invention can control the NOx of the chimney inlet input end in a given range; In contrast, the present invention can be in a shorter The control of the NOx concentration at the input end of the chimney inlet can be re...

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Abstract

The invention discloses a multi-variable interval constrained estimation-based SCR denitration optimized control system, which comprises an NOx concentration target value setting unit, a multi-variable predictive control unit, a proportional control unit A, an ammonia spraying valve A, an SCR reactor A, a transition flue between the reactor A to a chimney inlet, a proportional control unit B, an ammonia spraying valve B, an SCR reactor B, a flue between the reactor B and the chimney inlet, and the chimney inlet. The invention also discloses a control method of the above system. According to the technical scheme of the invention, the response speed of the ammonia spraying amount control to the unit load change is increased. Meanwhile, the influence on the performances of the system, caused by the saturation of an actuator, can be avoided. The actuating number of the actuator is reduced, and the service life thereof is prolonged. The economical efficiency of the denitration system is improved.

Description

technical field [0001] The invention relates to the field of thermal automatic control, in particular to an SCR denitrification optimization control system and method based on multivariable interval constraint prediction. Background technique [0002] As the pollutant with the most environmental problems, nitrogen oxides have become a major focus of pollutant emission control in coal-fired power plants. Coal-fired power plants mainly use post-combustion denitrification to control NOx emissions. There are two common flue gas denitrification technologies: Selective Non-Catalytic Reduction (SNCR) denitrification and Selective Catalytic Reduction (SCR) denitrification. Compared with the SNCR denitrification technology, the SCR method requires a lower reduction reaction temperature, can be installed at the tail of the boiler, has little impact on the furnace, and has high denitrification efficiency. Therefore, the SCR method has been widely used in industry and is currently used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D11/16
CPCG05D11/16
Inventor 李益国谈晨伟沈炯刘西陲
Owner SOUTHEAST UNIV
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