ABSTRACT
The M-30 motorway ring located in Madrid is a road surrounding the centre of the Spanish capital. In 2007, FILTRONtec installed three air purification systems in one of the tunnel segments of this motorway. The existing tunnel was extended by 620 meters in 2022, now connecting the two existing sections beyond the former Vicente Calderón Stadium.
In March 2022, FILTRONtec was awarded the contract to design and install an additional air purification system for this new tunnel section. The installation and commissioning were completed in early 2023. The air purification system installed cleans an air flow volume of up to 305 m³/s. The air is extracted directly from the tunnel section adjacent to the filter unit. The city of Madrid required the installation of a particle filter achieving high separation rates for particles classified as PM2.5 and PM10. The filter installed by FILTRONtec is meeting this requirement. It is a two-stage electrostatic precipitator and separates over 85% of the fine dust particles. The automated filter cleaning allows for the reuse of wastewater through a combination of pumps, a compressor, and a water treatment system, thus demonstrating a high degree of sustainability. The power supply for the systems is provided by a three-phase transformer rectifier unit, which supplies voltage to both the ioniser and the collector of the electrostatic precipitator. This power supply unit was precisely adapted to the requirements of the installed electrostatic precipitator to achieve maximum efficiency of the air filtration system. The cleaned air is discharged from the filter building into the surroundings.
The paper will focus on the operation and unique features of the installed system by showcasing developments in filter technology over recent years and their impact. Additionally, it will explain the construction requirements for installing an air filtration system and the associated operating costs.
