Abstract
A new neutron and gamma-ray analysis system has been developed for the direct on-conveyor belt analysis of ash in coal. This analysis system incorporates a method for ash measurements that is relatively independent of changes in segregation, belt loading, and ash composition. Consequently, the analysis system provides greater accuracy than on-belt dual energy gamma-ray transmission (DUET) gauges but at a much lower cost than by-line prompt gamma-ray neutron activation analysis (PGNAA) analyzers and samplers. The NITA (Neutron Inelastic scatter and Thermal capture Analysis) method simultaneously measures prompt neutron inelastic scatter and thermal neutron capture gamma rays from bulk coal samples using a 241 Am-Be fast neutron source and bismuth germanate (BGO) detectors in transmission and backscatter geometries. The NITA method has been tested in both laboratory feasibility studies and, more recently, under simulated industrial conditions using a prototype analyzer. Measurements have been carried out on coal samples of ash contents from 6.7 to 49.4 wt% (dry basis (d.b.)) with variable ash composition and at thicknesses between 100 and 300 mm. The results show that accuracies of ∼0.5 wt% ash are achievable over a wide range of ash values, compositions, and thicknesses.
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