Since the mid-1980’s coal producers have known that the most accurate on-line coal analyzers were the full elemental type, analyzing sample streams and employing PGNAA technology. In 1993, Thermo Gamma-Metrics introduced a through-belt model of this technology to the cement industry, enabling analysis of a full process stream without sampling. However, this concept was delivered to the coal industry just two years ago. The authors offer a review of this new product concept, with field results, advantages, and limitations.
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