ENERGY EFFICIENCY
Hot water integration following co-generation.
l two water cooled centrifugal units (4133 MW)
l four evaporating towers (4.7 MW) with axial fans, each combined with absorbers or chillers, silenced and equipped with a water treatment system.
Including 36 sub-stations in total, the modernisation of the plants mainly involved the installation of three new heat exchangers – one for heating and two for the production of hot water – in addition to chlorine dioxide disinfection systems for the prevention of Legionnaire’s disease. Connections for the new cooling network were also installed. The water network was also renewed using innovative materials and technologies, which are intended to prevent the potential proliferation of pathogens, such as Legionella and pseudomonas. Two newly constructed wells feed a network dedicated to non- potable water for industrial use. Finally, the new fire ring, which is connected to the pressurisation plant adjacent to the water supply, supplies the external fire hydrants and the fireproof risers present in the various buildings.
The telecontrol system The project included the installation of an automated remote control and management system with distributed
The fume recovery boiler.
logic, capable of managing and optimising the entire cycle of production and the distribution of energy. The system is divided into several control stations for the functioning of plants and networks and provides for the programmed management of all the systems and for the scheduled execution of maintenance activities. It also measures the energy produced and distributed in the various pavilions, with the aim of creating a useful record for verifying how energy flows are used and actual efficiency to support future projects and improvements. One of the most important technical aspects is the change from the previous superheated water distribution network (about 170˚C) to the current hot water network (95˚C), with an increase in efficiency due to the lower thermal gradient. This involved the complete overhaul of the distribution networks, including everything from the underground tunnels that house them and the relative fire fighting devices to the sub-stations present in each of the hospital pavilions.
All the plans included devices for the
containment of noise emissions. For example, the thermal power plant has a large soundproof wall, which is made up of elements that can be opened towards the ventilation space, used for the
movement of components and are useful for maintenance. The maintenance of mechanical and electrical systems and the building was started when the work sites opened in order to support all the planned interventions. The concession for the construction and management of the technical plants, technological systems, works and services is not limited to the service delivery and integrated management of the energy service, but includes global responsibility for the construction, operation and management of mechanical systems, led by a single contractor and under the control of computerised activities protocols. Design, organisation and management are at the heart of the concession. In addition to guaranteeing comfort throughout the year, future plans for the polyclinic mechanical system, include: l stopping the process of obsolescence of existing plants and systems and their transformation, completion and centralisation as soon as possible, which will result in economic savings
l the definition of a multi-year project of management and global maintenance for all mechanical plant, which guarantees uniformity of results through the standardisation of components and maintenance methods
The co-generator engine. IFHE DIGEST 2019
Boilers at the power plant. 17
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