Signal processing method for measuring mercury concentration of smoke of heat-engine plant on basis of CVAFS method

A technology of signal processing and mercury concentration, which is applied in the field of signal processing, can solve the problems of large errors and affecting the filtering effect, and achieve the effect of easy implementation, good filtering effect and simple software filtering method

Active Publication Date: 2017-07-21
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

Before filtering the signal, the corresponding state space equation must be obtained first, and the commonly used empirical model is Gaussian. By comparing this model with the actual curve, it is found that the error of the model is large, which will inevitably affect the final filtering effect.

Method used

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  • Signal processing method for measuring mercury concentration of smoke of heat-engine plant on basis of CVAFS method
  • Signal processing method for measuring mercury concentration of smoke of heat-engine plant on basis of CVAFS method
  • Signal processing method for measuring mercury concentration of smoke of heat-engine plant on basis of CVAFS method

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Experimental program
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Effect test

Embodiment 1

[0042] The voltage signal of the mercury analyzer comes from the wave peak after the hardware filtering process produced by the mercury analyzer when monitoring the mercury content in the flue gas of a coal-fired power plant given in the TekranMercury Data System in the Tekran 2600Mercury Analysis System for a certain period of time, such as figure 1 shown.

[0043] Further, the voltage signal data preprocessing includes the following steps:

[0044] S11, randomly find a peak from the obtained several peaks, the present invention takes the second peak, and obtains 23 groups of voltage values ​​under the premise of satisfying the Shannon sampling theorem;

[0045] S12. Import the obtained 23 groups of voltage values ​​into MATLAB, and draw as image 3 The voltage peak curve is shown.

[0046] Further, the segmental polynomial fitting of the voltage curve includes the following steps:

[0047] S21. According to the characteristics of the voltage curve, the voltage curve is se...

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Abstract

The invention provides a signal processing method for measuring mercury concentration of smoke of a heat-engine plant on the basis of a CVAFS method. The method comprises the following steps: acquiring an output voltage signal of a mercury analyzer; preprocessing data of the voltage signal; carrying out segmented polynomial fitting on a voltage curve; establishing a corresponding state-space equation for a fitted polynomial; and carrying out multi-model extension Kalman filtering processing on a noised signal. The signal processing method is used for the situation that a system accurate mechanism model in the field of online monitoring of mercury concentration of the smoke of the heat-engine plant on the basis of the CVAFS method is difficult to determine; filtering processing on output signals of a photomultiplier can be realized; the method is simple and is easy to implement; and the filtering effect is good.

Description

Technical field: [0001] The invention relates to a signal processing method for measuring the mercury concentration in flue gas of a thermal power plant based on a CVAFS method, and belongs to the technical field of signal processing. Background technique: [0002] As a highly toxic trace heavy metal element, mercury has attracted more and more attention at home and abroad for its potential persistent harm in environmental pollution. In 2011, the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) issued by the Ministry of Environmental Protection of my country included mercury in the scope of control, stipulating that the maximum emission of mercury and its compounds in coal-fired power plants is 0.05mg / m 3 In 2015, this standard was raised to 0.03mg / m 3 . Although my country currently restricts new coal-fired power plants, they are still the main power generation in my country, so the monitoring and control of mercury pollutant emissions from c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 程力骆毅段钰锋
Owner SOUTHEAST UNIV
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