Coal Ash Monitor LB420 - the online coal ash analyser

Coal Ash Monitor LB 420

online coal ash analyser for coal ash analysis and monitoring

Rapid determination of coal ash content

On-line coal ash analysis

Accurate

Noncontacting

Typical applications of the Berthold coal ash analysis system

rapid determination of coal ash content during train loading or delivery to the power station for quality assurance

monitoring and control of blending methods

recognition of trends in the coal ash content

run-of-mine coal ash analysis

coal ash monitoring of the output of coal preparation plants and coal washeries

Compelling advantages

On-line measurement
Continuous rapid monitoring of the ash content without laborious sample preparation
Noncontacting measurement
No caking of the measurement transducers
No wear as a result of moving parts or abrasion
Transmission measurement
Measurement and calibration irrespective of belt loading and bulk density variations
Simple installation
Installation directly on the conveyor belt in the main flow or at an existing sample inspection system
Minimum space requirement
Precise and reliable
High accuracy irrespective of the ash content range
Representative measurement by averaging over large material quantities
High long-term stability due to automatic drift and decay compensation

Double-Energy Transmission Method Measuring Principle

The radiation emitted by a gamma source is attenuated when it passes through matter (transmission). A scintillation detector, which is very sensitive to gamma radiation, measures the attenuated radiation and supplies a digital signal which is proportional to the radiation intensity. The absorption of the low-energy gamma radiation from 241Am increases as a function of the atomic number of the material through which the radiation passes. The ash components in the coal have a higher atomic number than the coal itself and thus give a higher absorption level. This absorption is a direct measure of the ash content.

In addition, the attenuation of the radiation during transmission measurement depends on the area weight through which the radiation passes, i.e. on the bulk density and on the loading of the conveyor belt. The area weight is determined independently of the ash content by a second transmission measurement, whereby the higher-energy gamma emitter 137Cs is used. By combining the absorption measurement with 241Am radiation, which depends on ash content and area weight, with absorption measurement by 137Cs radiation, which depends only on area weight, it is possible to obtain a measured value which is proportional to the ash content and independent of the bulk density and bulk height (double-energy transmission method).

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Berthold Industrial Systems

Coal Ash Monitor LB 420