Convective flue gas analysers
August 2006
Analytical Instrumentation & Environmental Monitoring
Ametek's convective flue gas analysers are designed for applications with high particulate levels in gas streams. The WDG-HPII and WDG-HPIIC analysers mount directly on the combustion process to provide continuous measurement of oxygen or oxygen and combustibles.
The analysers are suitable for gas streams up to 704°C using the standard 316SS probe/filter assembly. Flue gas temperatures up to 1537°C can be measured using optional high temperature probes. For corrosive gas streams, sample wetted parts in Hastelloy or Inconel are available. The analysers can be provided in a range of mounting styles, and for hazardous area locations, purged or explosion-proof versions are available.
Since the sample inlet and return are inside the filter and at the same absolute pressure as the process, there is no flow through the filter. The flue gas oxygen diffuses through the filter and the sample in the filter flows through the sensor plumbing because of a convective motive force. The sample in the vertical cell housing is heated to 695°C while the sample in the return vertical tube is at approximately 249°C. This difference in temperature generates a density difference that circulates the gas through the system. Process gas enters and replenishes the gas inside the filter by diffusion only. This eliminates filter blockage making the analysers ideal for high particulate applications.
The WDG-HPII and WDG-HPIIC analysers are suitable for use in a variety of furnaces, boilers, lime and cement kilns and various types of incinerators. The units are available in various Ex configurations depending on the hazardous area classification.
For more information contact Noel Bauchop, OEN Enterprises, +27 (0) 11 675 4447, [email protected], www.oenenterprises.co.za
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