CCGT power plant
Hassyan Power Plant (Hassyan PP) is a gas-fuelled power plant being constructed in Hassyan, Dubai, UAE. The project integrates a power island and a desalination island. The production capacity of the desalination island is 720 million imperial gallons per day (MIGD).
When fully operational, Hassyan PP will be one of the largest power plants in the world with a production capacity of 9,000MW. The power plant, which is being built on the shores of the Arabian Gulf, is owned by the Dubai Electricity and Water Authority (DEWA).
The growing economy and population of UAE called for new power and water projects in Dubai such as the Hassyan power plant and desalination facility.
DEWA may privatise 1,500MW of the plant. It is currently looking to appoint a consultant to suggest on the privatisation.
The project was designed to meet the increasing demand for power and water in Dubai, and will be carried out in six phases. Each phase will include the construction of a power island with a capacity of 1,500MW and a desalination island with a capacity of 120 MIGD. The cost of each phase of the Dubai power station is estimated to be between $2bn and $3bn.
The first power station P1 will be operational in 2014 and the remaining five will follow.
DEWA has selected Mott MacDonald (MMD) as the owner’s engineer for the P1 station, seawater intake and outfall system. MMD carried out the feasibility study for the development of the 9,000MW power plant and a 720 MIGD desalination plant. MMD is also involved in the work related to site layout and provides co-ordination for the entire Hassyan complex.
Hassyan power plant will be housed on a 4km2 site located 60km south-west of Dubai. The power island P1 will incorporate a combined-cycle gas turbine (CCGT) system. The system consists of four F-class gas turbines, four heat recovery steam generators and two backpressure steam turbines.
The power island will use natural gas as the primary fuel. Diesel oil will act as the secondary fuel in case of disruption in the supply of natural gas. The Dubai Supply Authority (DUSUP) will supply the required fuel to the power plant. A service corridor will be built along the southern length of the site to supply natural gas and diesel to each power island.
The Dubai power station will have four fuel storage tankers with a capacity equivalent to operating the P1 station for ten days. P1 will integrate a gas buffer system that enables the automatic changeover of fuel.
A seawater intake canal being built will provide water for desalination and cooling to all the six islands of the project. The canal will be along the northern length of the site and designed to carry 90,000gal of water per second.
The project’s construction work includes building six power islands and six desalination units on the site. The construction of the Hassyan PP will be carried out in six stages. Each stage will involve the construction of power stations with a capacity of 1,500MW. The construction of the first two plants, P1 and P2, will form the first phase of the project. The remaining power stations will be built in subsequent phases.
The construction of the intake canal for the desalination facility began in 2009. This includes the construction of offshore and onshore canals with a length of 1.5km and 4km respectively. An offshore outfall channel, which discharges cooling water and brine from the facility, will also be built.
The outfall channel will have its terminal at a distance of 4km from the sea in order to avoid the re-circulation of warm discharged brine into the intake channel.
The power plant in the UAE will employ a CCGT system for power generation, to enhance efficiency and reduce emissions.
The CCGT to be installed includes inlet filters that draw air required for combustion. The air drawn is cooled before entering the compressor cabin of a gas turbine where the pressure of the gas is increased.
The pressurised gas interacts with the fuel in the combustion chamber and generates gas of high temperature and energy. The pressurised gas will act as a mechanical force that drives the gas turbine, which in turn supplies mechanical energy to the generator.
The escaped hot gases will be transferred to the heat-recovery steam generator in order to convert water into steam. The steam generated will drive the steam turbine, which provides mechanical energy to another generator.
The Dubai power station will be operated automatically from a central control room of the power plant. A distributed control system (DCS) will be integrated by the plant in order to control and monitor the power station.
The power produced by each generator of P1 will first be transmitted to a 400kV substation by using gas-insulated lines. The substation will further supply the power to the DEWA transmission network.
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