Measuring system of ash content and heat productivity of coal, and measuring method thereof

Abstract

The invention provides a measuring system of ash content and heat productivity of coal, and a method for measuring the ash content and the heat productivity of the coal by using the system. The system is characterized in that: dual-energy gamma ray transmission measuring devices are arranged in front of the inlet of coal combustion equipment and behind the outlet of the coal combustion equipment respectively, so as to measure attenuation coefficients of the coal and coal ash respectively; the ash content and / or the heat productivity of the coal are calculated by combining attenuation coefficients of the coal and the coal ash. The measuring system disclosed by the invention both satisfies the demand of real-time measurement and eliminates influence to measurement of the ash content and the heat productivity of the coal by content change of high atomic number elements, so that measurement of the ash content of the coal is free from influence by change of coal type, and measurement accuracy is increased.

Description

technical field [0001] The invention relates to the field of coal detection, in particular to a coal ash and calorific value measurement system and a measurement method thereof. Background technique [0002] The dual-energy gamma ray transmission method is a widely used method for measuring coal ash at present. By measuring the attenuation coefficient of the coal flow for two gamma rays of different energies in the dual-energy gamma ray transmission measurement device, the coal ash content is calculated, and then The calorific value of coal can be calculated from the ash content of coal. The method is real-time, quick and easy to operate, and can be better applied to coal-consuming places with fixed coal sources. [0003] However, the disadvantage of this method is that the measurement results are greatly affected by changes in the content of high atomic number elements in coal, for example, changes in the content of elements such as iron and calcium in coal will directly a...

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Problems solved by technology

[0003] However, the disadvantage of this method is that the measurement results are greatly affected by changes in the content of high atomic number elements in coal, for example, changes in the content of elements such as iron and calcium in coal will directly affect the measurement results of ash

For coal-consuming units with complex coal sources such as thermal power plants, because the coal used comes from multiple mines and production areas, the content of high atomic number elements generally varies greatly, so using this method to measure coal ash content has a large error

And this problem is difficult to solve through calibration, because using the calibrated ash calculation parameters is only accurate for the coal quality at the time of calibration, and using the calibrated parameters to calculate ash content after the coal quality changes may cause large errors

In practical applications, the change of coal quality is usually irregular and difficult to predict, which brings great difficulties to the application of this ash measurement equipment in the case of complex coal sources

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