The research team behind Project LSDi (Liquid State Dual fuel Injection) visited the D4 power plant within the Delimara Power Station complex, operated by ElectroGas Malta. This power plant features a state-of-the-art combined cycle setup, consisting of three identical Siemens gas turbines – each with an output of approximately 53 MW. The exhaust from these turbines is used to generate steam in dedicated Heat Recovery Steam Generators (HRSGs), which is then delivered to a single steam turbine rated at 70 MW. This integrated system achieves a high overall efficiency, with the plant’s combined output reaching a total of around 220 MW.

The gas turbines at D4 operate exclusively on natural gas (NG), which is delivered from the Liquefied Natural Gas (LNG) regasification facility. LNG is imported and stored in a Floating Storage Unit (FSU) anchored at Delimara. At the regasification plant LNG is regasified and discharged at 37 bar. The pressure is then reduced to 8 bar for supply to the D3 power plant and to 33 bar for the D4 plant. Notably, LNG is regarded as a cryogenic fuel due to its low saturation temperature of approximately   -160°C at atmospheric pressure.

During the visit, a full overhaul was underway on both the steam turbine and one of the gas turbines. This allowed the LSDi research team to closely observe the internal components and gain practical insights, deepening their understanding of theoretical principles related to turbine design and operation. The visit also served as a critical opportunity for the researchers to study the safety protocols implemented when handling and distributing natural gas.

This exposure is especially relevant to the LSDi project, which is exploring knock mitigation in engines using LNG as a primary fuel. The knowledge gained will be valuable for the experimental methodologies and risk management strategies for LNG use.

The researchers of Project LSDi would like to express their appreciation to ElectroGas Malta for facilitating this informative visit, which has greatly enhanced the team’s grasp of complex energy infrastructure. The team also extends sincere thanks to Xjenza Malta, project Liquid State Dual fuel Injection LSDi, REP-2024-051 is financed by Xjenza Malta through the FUSION: R&I Research Excellence Program.

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