A flue dilution system is normally installed where difficulties are encountered in the provision of a conventional flue to above roof level.
Flue dilution is only permitted for VLS (very low sulphur, i.e. <0.04%) fuels up to a total combined gross heat input rating 5.45MW nett heat input or 6MW gross heat input. However, regulations recommend flue dilution systems are not installed on systems with a combined net heat input greater than 2MW.
These systems are designed on the principle of diluting the vented products of combustion sufficiently to reduce the CO2 content to the required level of below one per cent. Fresh air and products of combustion from the boilers are drawn into a duct by a fan and consequently diluted, thus maintaining the low CO2 discharge levels, enabling safe discharge at low level. We also provide design advice on noise and plume reduction methods.
We carefully design each system ensuring compliance with the Clean Air Act and Environmental Health Noise Control requirements.