In a power plant with thermal engines, exhaust is a very powerful noise source potentially causing sound nuisance for personnel of the operator operating in the vicinity as well as for the neighborhood (including long distance, a fortiori in the case of tall stacks). It is often necessary to use in such cases a soundproofing equipment of high technology to ensure compliance of the installation on the one hand with respect to the legislation on noise at work and on the other hand with respect to the regulation in terms of environmental protection. In fact exhaust silencers for thermal engines (such as those equiping gensets) must often have high acoustic performance (the overall sound power level to consider is often greater than 120 dBA and noise emissions include low frequency components involving specific soundproofing devices) in a context where high temperatures (around 425 °C or sometimes more) and high gas flow rates must be considered: great care must be taken when sizing to limit the total pressure loss directly impacting the productivity of the plant.
ITS will participate in the construction of an exhaust system for a thermal engine (diesel) with a high power in the context of the realization of a power plant near Bordeaux, in the region Aquitaine (France).
The soundproofing system must have a sound transmission loss particularly important, requiring the implementation of a primary silencer - with an insertion loss of 40 dB(A) - and of a secondary silencer - with an insertion loss of 30 dB(A) - (installed in series : each silencer being of the absorptive / reactive type). Due to the compacity requested for the exhaust system, the flow speed of exhaust gas into the silencers will be extremely high, requiring a specific design of the silencer in particular with respect to issues related to aerodynamic and to self-noise.
Therefore, the simulation of the insertion loss (with or without flow noise) as well as of the total pressure loss of the silencer in the foreseen operation conditions will be a key step of the project.
Materials used for the construction wich properties must satisfy both the ambitious goals of acoustic performance and also to requirements related to mechanical and thermal extreme solicitations will be incorporated into the design as required for this exhaust system for a thermal engine (diesel).
The manufacturing will be performed according to the highest construction and quality standards in order to allow the delivery of soundprofing equipments of which the expected longevity has been a reason why choosing equipment offered by ITS.