System and method for detecting carbon content in fly ash under dynamic conditions of hollow metal waveguide

Abstract

The invention provides a system and method for detecting the carbon content of fly ash under the dynamic condition of a hollow metal waveguide. The system includes: a bypass measurement unit and a measurement device capable of real-time measurement of the fly ash from a flue. The measurement method is as follows: the standard ash sample of the same kind of coal is first introduced into the hollow metal waveguide for measurement, and the S21 amplitude or phase data of the standard ash sample is obtained, and the data is fitted to obtain the fitting relational formula at different frequency points of the standard ash sample; Start the air compressor to introduce the fly ash in the flue into the hollow metal waveguide through the jet device and the cyclone separator, and use the vector network analyzer to select any frequency point to test the imported fly ash, and obtain the S21 amplitude or The phase data is substituted into the relational formula to calculate the carbon content. The present invention has higher resolution and test accuracy, and the test results between different carbon contents are relatively stable and clearly distinguished, and every 2% increase in carbon content corresponds to a 15-20° change in the S21 amplitude parameter , with better precision.

Description

technical field [0001] The invention relates to the field of testing the electromagnetic parameters of the carbon content of the fly ash at the tail of a thermal power plant, in particular to a system and method for detecting the carbon content of the fly ash under the dynamic condition of a hollow metal waveguide. Background technique [0002] The carbon content of fly ash is an important parameter reflecting the combustion efficiency of boilers in thermal power plants. Accurate, timely and effective monitoring of the carbon content in fly ash is of great significance for adjusting boiler combustion and improving combustion efficiency. At present, a variety of measurement methods for carbon content in fly ash have been developed, which are mainly divided into two categories: physical measurement and soft measurement. Physical measurement is to use the physical and chemical characteristics of carbon flammability and high dielectric constant to detect the carbon content of fl...

AI Technical Summary

Problems solved by technology

It is understood that many power plants are still using the sampling method to detect fly ash samples. The following problems generally exist in the sampling method: when the ash sample enters the measurement chamber, the temperature drops sharply and condensation occurs, which blocks the measurement chamber with ash, and the tail smoke is not clear. Due to the characteristics and distribution of the flue gas flow field, the sampling is not representative, the influence of the fly ash concentration on the measurement results is ignored, and the additional equipment is complicated to increase the investment and maintenance costs of the equipment.

[0004] The existence of the above problems is difficult to meet the requirements of real-time and accurate detection of carbon content in fly ash in thermal power plants

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