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France (site survey)

EDF commissioned RJM to carry out a site survey at one of its oil-fired plants near Paris to find out what its options were to deliver peak network and still meet the latest NOx emission limits, set out in the 2010 LCPD.

EDFEDF was experiencing emissions challenges at one of its oil-fired plants just outside Paris, France. Two of the plant's four units had been mothballed for 12 years and EDF wanted a third party evaluation to see what cost-effective emissions control techniques might be required to make it capable of meeting peak network load.

It would also have to be fully-compliant with the anticipated 2010 European Union LCPD (Large Combustion Plant Directive) emissions limits expected to be not greater than 400 Mg/Nm3 for NOx and 50 Mg/Nm3 for particulate emissions.

RJM sent a three-man team to the plant to spend a week reviewing every aspect of its four generation units. This included comparing key features on the engineering drawings against actual dimensions on the plant - often the drawings don't show latest modifications -and tracking every stage in the combustion process for each unit.

As all four units were configured differently, RJM's report provided a set of individual solutions for each one, in a way that would yield maximum emissions benefit at minimum cost. Of key importance, for example, was the fact that the report confirmed that excellent performance could be achieved without the need to add selective non-catalytic reduction (SNCR) or selective catalytic reduction (SCR) technology to the units.

While SNCR or SCR systems lead to bigger NOx reductions, they are relatively costly to add on, since ammonia has to be bought in, and an ammonia storage plant has to be built adjacent to the unit.

RJM's report also confirmed that availability and reliability of the boilers would not be affected and that minimal changes to the control schemes of the boilers were needed.

Checking measurements on an oil lance

Taking accurate measurements and comparing them with the dimensions marked up on the site plans is a key part of the site survey process.  Here the length of an oil gun on Unit 2 is being verified.