Procal - Parker Hannifin Corp

In-situ continuous emissions monitoring & regulatory compliance

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Courtesy of Procal - Parker Hannifin Corp

As environmental scrutiny has risen and regulation has tightened in recent years, the importance of having accurate information on the environmental performance of your power plant has increased.

After all, if you want to manage something, you need to be able to measure it. The analogy is obvious; you wouldn't start a diet without first investing in a set of scales.

So it is with Continuous Emissions Monitoring (CEM), which not only helps you to meet your environmental targets, but also has a critical role to play in the pursuit of operational excellence.

Extractive CEM systems have traditionally been relied upon to monitor the levels of pollutants from power plant operations. These systems fall into three categories: cold extractive, where the sample is drawn from the stack, rapidly chilled, then analysed; hot extractive, where the sample is analysed when hot; and the dilution system, where the sample is diluted to avoid the need to remove water vapour and remove the risk of condensation.

However, all these methods pose particular technical challenges, as well as higher maintenance burdens.

The answer lies in In-Situ CEM systems. Kittiwake Procal's leading emissions monitoring solution is the Procal 2000, an infrared duct or stack-mounted analyser, which provides simultaneous in-situ emissions analysis of multiple gases.

The Procal 2000 uses the reflective beam principle to directly measure process gas as it enters the in-situ sample cell. Unlike high-cost, highmaintenance extractive systems, this removes the need for gas filtering or sample conditioning, and achieves uptime of over 98%. It also has MCERTS approval and is US EPA compliant.

The Procal 2000 can monitor for up to six gases, including NO, NO2, SO2, CO, CO2 and H2O. It can also report on a wet or dry gas basis and requires no operator intervention during routine use. The data collected can be displayed on a Microsoft Windows-based system or a standalone unit, such as the Procal 1000 Analyser Control Unit. This can display gas concentrations, sample conditions, diagnostic data and trends, along with data from other sources, allowing for a single CEM data hub.

The Procal 2000 is used in coal, oil, gas and biomass fired plants across Europe, the USA and the Asia Pacific region. This includes Drax Power Station, which is Europe's largest coal-fired power plant. Procal 2000 units (18) have been in operation at Drax for the past 10 years, helping to ensure a reliable operation on coal and biomass top-up fired fuels, supported by a 24-hour service and maintenance agreement. Procal's in-stack emissions monitoring technology is also used by the Bermuda Electric Light Company Ltd (BELCO), Bermuda's sole supplier of electricity with 165 MW of diesel and gas turbine capacity. In 2008, BELCO established a formal environmental policy by voluntarily adopting ISO 14001, making it only the second company in the Caribbean to seek this certification, and developing an Environmental Management Programme, which required accurate measurement of air emissions.

Not only does BELCO's In-Situ CEM system ensure compliance with the Clean Air Act 1991, as required by its Operating Licence from the Environment Authority, it also contributes to good operational practices by informing engine load maximisation & providing preventative maintenance indicators to optimise fuel efficiency and reducing stack testing requirements.

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