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April 1, 2011

PEMS: The Low-Cost Alternative To Emissions Monitoring

Real-world experience with installing and using both PEMS and CEMS at this methanol manufacturing facility is shared. The advantages of PEMS are many

Amer Khaqan, Saudi Methanol Co. (Arrazi)

Regulatory authorities around the world require continuous emissions monitoring of certain pollutants from large combustion sources. There are two main technologies for monitoring these emissions on a continuous basis — the more traditional one relies on sampling and analyzing exhaust gases from a continuous emissions monitoring system (CEMS); and the newer one relies on software that uses mathematical algorithms and equations to predict emissions levels from existing control-system data. This second system is called a predictive emissions monitoring system (PEMS).

In this article, practical experience and installation details of both CEMS and PEMS at the reformers and boilers of the Arrazi methanol manufacturing complex are presented. The real-world experience gained in about two-and-a-half years of operation is shared and can be used as a template to implement PEMS at any site.


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