Cuenod selected by Dalkia for the renovation of a boiler room in Tours

Cuenod has just participated in the modernization of an urban heating system for 8500 homes in Tours.

An operation under the banner of environmental and energy efficiency

The Société de Chauffage du Bord de Cher (SCBC, a subsidiary of Dalkia) operates, on behalf of the city of Tours, the management of heating and domestic hot water for a real estate complex made up of condominiums, social housing and buildings for collective use: school, gymnasium, college, etc. This is the equivalent of 8500 homes for a population of approximately 15 to 18 inhabitants. 

To provide this service, one of the energy sources is a boiler room containing four boilers with a total output of 4 megawatts. It serves two districts: one by 43 substations supplied with superheated water at 30°C, the other by 180 substations with hot water at 53°C.

This 40-year-old boiler room, classified as ICPE, had to be modernized and brought into compliance with the latest regulations on atmospheric emissions. Cuenod won the call for tenders launched by Dalkia.

La The first phase of work was carried out with two CC600 duo-block burners equipping an 8-megawatt gas boiler. A second burner, CC900, is planned to equip a 15-megawatt boiler, after thorough verification by Apave.

Cuenod owes its success to the customization of a response guaranteed by a Low NOx combustion system, precise regulation of excess air and an extended modulation range. The combination of these 3 technologies associated in a single product is an exclusive know-how of Cuenod.

 "Our variable setpoint O2 management plays on excess air based on the presence of an additional probe capable of continuously measuring the CO content. This information, which allows the O2 value to be reduced to a minimum, is adjusted at all times, regardless of the load, to deliver only the minimum excess air. The observed gain is very significant compared to conventional solutions with a fixed O2 setpoint. This, for safety reasons, is very often largely oversized, since it is very often around 4%, and therefore unfortunately energy-intensive. " explains Mr. MARKS, Director of the Western Region Cuenod in Nantes and who exclaims :

 "Excess air exists, but with a value below 2% it is controlled and does little to cool the flame. This regulation, combined with a wide modulation range and low NOx emissions, allows our burners to avoid overconsumption that is currently quite unnecessary."

In fact, the control system takes care of safety constraints and the permanent work of the probe generates every eight hours an ideal curve of the O2 setpoint, taking into account the workload assigned to the burner, the humidity, the air temperature and the quantity of energy.

Current regulations on NOx emissions (*) require this type of boiler room not to exceed the threshold of 120mg/m3. Cuenod shows a much lower score with 100mg/m3 maximum. The volume of discharges from the boiler room was reduced by 45%. "The planet will be happy to hear this! And so will Dalkia, because it is part of its requirements to be environmentally friendly."

Dalkia is indeed requesting “low NOx(*)” scores and, It is by deepening the points of superiority of industrial burners Cuenod, their references, their guarantees of results and their low emission levels that these products have naturally established themselves" says Laurent Buffet of Dalkia, in charge of the renovation of the SCBC facility.

The regulation of oxygen and CO appears to him as a major asset to enhance this action and, "...the results measured in terms of security, regulations and modulation ranges since October 2008 are very interesting. They also guarantee the essential continuity of service." He continues.

Given the technological advances highlighted in this renovation, where the burner and automation systems manage everything and the interface provides a comprehensive diagnosis, the boiler room operating staff wanted to add components that would allow them immediate support and rapid diagnosis of anomalies. This renovation is fully in line with current environmental issues, in which DALKIA is a major player.

Laurent Buffet sees it "A good opportunity to show that we are respectful of the environment and regulations."

(*) NOx :Chemical abbreviation for nitrogen and oxygen compounds that include: nitric oxide (NO), the dioxide d'nitrogen (NO2), the  Nitrous oxide(N2O), carbon dioxide (CO2), THE Dinitrogen tetroxide (N2O4), the Nitric oxide (N2O3). The compounds analyzed by air pollution alert and measurement networks are NO and NO2, grouped under the generic term nitrogen oxides (NOx)

 Press contacts:

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Chiara Bergerone
Phone. : 04 50 87 84 34
sharia.bergerone@aristonthermo.com

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