POWER PLANT DESIGN | FUSION
Targeting a Fusion Demonstration Plant
Canada-based General Fusion is aiming to transform the way the world is energised with its Magnetized Target Fusion (MTF) technology
THE RACE TO COMMERCIALISE CLEAN fusion energy reached a milestone this year when General Fusion announced it will build a demonstration plant for its magnetized target fusion (MTF) technology. The plant will be used to verify that General Fusion’s MTF technology can create fusion conditions in a practical and cost-effective manner at power plant relevant scales. Construction is anticipated to begin in 2022, with operations beginning approximately three years later. MTF competes with alternative fusion technologies like
tokamaks such as the Joint European Torus (JET). Both need to heat and compress fuel to enormous temperatures to initiate fusion. Like a tokamak, an MTF reactor involves hot plasma contained by a magnetic field. But where the plasma fuel in a tokamak uses an external energy source to heat it, the plasma in an MTF reactor is superheated by being pressurised. This pressure is applied by pistons that coordinate to make a pressure wave. The plasma is surrounded by a liquid metal ‘wall’. ‘Hot’
neutrons escape the plasma and are captured in the liquid metal. A heat exchanger extracts the energy which, as in other fusion designs, is converted to electrical power via conventional turbine generators. In practice, in General Fusion’s MTF, this metal wall takes
the form of a tank containing liquid metal, which is spun until a cavity is formed. Hydrogen plasma is injected into the cavity. The plasma is compressed and heated to more than 100 million degrees Celsius, and fusion occurs. The metal wall can be combined with liquid lithium to breed tritium within the power plant. The Fusion Demonstration Plant (FDP) will be hosted by the UK Atomic Energy Authority (UKAEA) at its Culham Campus in Oxfordshire. It claims to be the first public-private partnership created to support a fusion demonstration that will be focused on delivering a complete power plant, rather than demonstrating the core fusion technology. General Fusion says the FDP will confirm the performance and economics of the MTF technology so the company can scale it to a commercial fusion pilot plant. The key components of an MTF power plant are the
plasma injectors, pistons and liquid metal vortex in a reactor with a central core just 3m in diameter. Currently, General Fusion is developing and optimising these components in parallel to accelerate construction of a demonstration power plant.
44 | October 2021 |
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Practical approach General Fusion says this practical approach will maximise the use of existing industrial technologies so there is a shorter timeline to move from technology testing to commercial deployment. The FDP aims to ‘set the scene’ for a commercial pilot plant by the early 2030s. The company cites four advantages it believes will deliver the full benefits of fusion energy faster. They are: Material durability. The liquid metal liner shields the
MTF structure from neutrons released by the fusion reaction, overcoming the problem of structural damage to plasma-facing materials (also called the ‘first wall’ problem). Fuel fabrication. General Fusion uses high-powered
pistons to compress the plasma to fusion conditions. High-speed digital controls manage and synchronise the timing of 500 individual driver pistons for compression process that happens in milliseconds. Fusion occurs as the liquid metal compresses the plasma, resulting in a release of energy and tritium, which will be captured and used as fuel. Energy conversion. In the commercial pilot plant,
the heat will be extracted from the metal and used to make steam. The steam will drive a turbine and produce electricity, as is commonly used in power generation today. Energy economics. MTF is straightforward to
manufacture and scale because it uses simple electromagnets and avoids expensive lasers. Using practical, existing technology — steam powered pistons — compresses the plasma to fusion conditions, and the exotic lasers or giant magnets found in other fusion approaches are not required. Steam pistons can be practically implemented in a commercial power plant. The power conversion systems are also readily available in the market.
Preparing to scale Construction is scheduled to begin on General Fusion’s FDP in 2022, with operations starting in 2025. The FDP will be at 70% scale of the commercial pilot plant, with an estimated 3000t machine on a site around 11,000 square metres in area. At this scale, the FDP is claimed to be closer to a power generation plant than any other fusion energy prototype. The FDP and commercial pilot plant will reach plasma fusion temperatures — more than 100 million degrees
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