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GE Energy’s new predictive emissions monitoring system (PEMS) solution for offshore platforms is available at a third the cost of a similar-accuracy continuous emissions monitoring system (CEMS).

Emerging legislation will soon require European offshore operators to monitor and report gas turbine emissions, with numerous other countries expected to follow suit.

In the past, offshore platforms relied primarily on temporary instrumentation to perform as-needed emissions estimates.

However, this approach lacked the necessary models to extend results to other operating regimes and ambient conditions, according to the company.

As such, there are only two viable options for compliance with regulations requiring higher accuracy: a CEMS or a PEMS.

While a CEMS offers a number of advantages, including the continuous and direct measurement of emissions, its capabilities may exceed the requirements of offshore operators.

A PEMS approach, in contrast, can approach the accuracy of a CEMS for as little as one third of the cost while adequately meeting the specific needs of offshore operators.

GE’s PEMS solution is now available for the large installed base of LM2500 SAC aeroderivative gas turbines used in offshore service and is extensible to LM6000 SAC units.

The PEMS solution is implemented in System 1 software and requires: System 1 software, Version 5.x or higher; a Bently Performance System Extender module; and PEMS configuration, tuning and installation services.

For users with existing System 1 and Bently Performance software installations, the PEMS option is a available as an add-on module.

In most cases, it can even be installed remotely from an onshore location.

The PEMS module employs a GE-developed ‘first-principles’ emissions model for the LM2500 SAC gas turbine.

This physics-based model uses fundamental engine parameters and conditions known to correlate to emissions output, drawing on extensive test results from the large installed base of LM2500 SAC units.

It uses ambient conditions, various turbine operating parameters and fuel properties as inputs and is valid for both gas and diesel fuels.

The model computes emissions estimates for nitrogen oxide, carbon monoxide and unburned hydrocarbons, while providing calculated values for carbon dioxide and sulphur dioxide.

A calibration feature enables customisation to a specific installation along with the post-installation refinement of model outputs based on tuning adjustments derived from temporary CEMS solutions and corresponding turbine datasets.

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