Measuring method of pulverized coal concentration

Abstract

The invention discloses a measuring method of pulverized coal concentration. The measuring method comprises the steps that a wavelet neural network model is built, and training is conducted; wherein the wavelet neural network model comprises a cold primary air volume, a primary wind temperature, a coal feed quantity, a hot primary air volume, a coal mill inlet and outlet pressure differential, a coal mill outlet pulverized coal temperature, a separator outlet pressure and a total air volume which serve as wavelet neural network inputs and takes a concentration value of pulverized coal at the coal mill outlet as a wavelet neural network output; the trained wavelet neural network model is used for real-time online measuring of the pulverized coal concentration, newly sampled coal mill data serves as an input of the trained wavelet neural network model, and an output of the trained wavelet neural network model is the concentration value of the pulverized coal at the coal mill outlet. According to the measuring method of the pulverized coal concentration, dependence on a training sample set is low, the stability of the measuring method is high, the robustness is good, the method is not affected by field measurement environmental factors, and the error-tolerant rate is high; a wavelet neural network measuring system is simple in structure, convenient to install, free of interference of the field measurement environmental factors, high in sensitivity and low in maintenance cost.

Description

technical field [0001] The invention designs a measurement method, specifically a method for measuring the pulverized coal concentration at the outlet of a coal mill. Background technique [0002] The concentration of pulverized coal is an important parameter that reflects the safety, economy and environmental protection of coal-fired power plant boiler combustion. The reasonable distribution of coal and air volume can ensure the safe and efficient operation of the boiler. Therefore, the realization of coal mill outlet coal Real-time, online and accurate measurement of powder concentration can improve the combustion efficiency of power plant boilers and ensure the safe operation of units. At present, the commonly used measurement methods include tribostatic method, capacitive method, optical method and process tomography method. Due to the complex flow characteristics of gas-solid two-phase flow, the detection of phase concentration is very difficult. The pulverized coal co...

AI Technical Summary

Problems solved by technology

This method obtains the electrostatic charge measurement signal through the electrostatic sensor. Since the electrostatic sensor is limited by many complicated factors, the measurement reliability of this method is poor and the measurement range is small.

Moreover, the measurement system based on this method is difficult to install and the maintenance cost is high, which seriously affects the accuracy and stability of pulverized coal concentration measurement.

In the harsh measurement environment of thermal power plants, this method is difficult to achieve real-time online measurement

This method uses fuzzy rules to infer data, has high requirements for training samples, and has slow measurement speed and low anti-interference ability.

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