Online Process Control with PGNAA, Analyser Systems Inc (ASYS)

摘要

One might be forgiven for being a little confused by the multitude of claims that label control systems and sensors 'online,' 'inline' or 'onstream' or 'instream' and hence a short clarification is in order. Above collection of designations are generally attributed to XRF raw meal analysers looking at partial side streams taken from the raw mill product stream. Their use for process control has improved on the previously common practice of one and two-hour analysis intervals followed by a proportioning feeder adjustment. What remain in terms of process control flaws are the time delay between blending and analysis points (the latter being downstream of the mill), and sampling and sample preparation variances.