SPECIALIST EQUIPMENT
irect optical methods for monitoring of gases are in use in a wide range of applications. For mining smelters and sulphuric acid plants, these technologies provide reliable measurements of gases with real-time feedback to the operators. Direct optical methods mean that gas analysis takes place in the gas stream, without extracting any samples. A beam of light probes the gas. A receiver collects the signal and a fibre optic guides it to the analyser spectrometer some distance away. Te system digitises the spectral information with incredible resolution and speed. Ten, in a fraction of a second, it calculates the result and puts it out to the plant DCS. Te result is a rugged and stable solution. Compared to traditional
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GAS MONITORING D
REAL-TIME
Carl J Kamme reveals how mining applications can benefit from direct optical monitoring methods
technologies based on sample extraction, transport and conditioning before measurement, there are significant differences. Te sample handling in an extractive system causes a slow and flattened signal due to an integrating effect. Direct optical measures the exact content passing the light beam during sampling. Te result is a true dynamic real-time signal. In addition, since these methods
exclude sampling handling used in traditional units, optical methods are less prone to failures, and the maintenance needed to operate such a system is limited. For mining smelters, sulphuric acid and other process plants, these systems can deliver a high-performing, stable solution in demanding situations where gases
may be hot, corrosive and contain high levels of vapours and dust. Applications include continuous emissions monitoring, measurement in raw gas to control a scrubber function and other process types of measurements.
ULTRAVIOLET DOAS UV-DOAS is the most dynamic tool for measurements of SO2
levels to high percent per volume. It can also measure other components, e.g. NOx, Hg, CO2
and H2 O. INFRARED FTIR
Tis technology is the most accurate alternative for measurements in the near-
plants and metal smelters. Te same system can monitor any level of SO2
and at sulphuric acid from low ppm
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