Lithium Hydride Liquid-Metal First Wall for Compact Fusion Reactors
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Solution Overview
Problem
Current fusion reactors are large, costly, and inefficient due to complex designs and high maintenance needs, particularly in plasma facing components and tritium fuel costs, with existing liquid metal solutions failing to achieve compact, high-power density and cost-effective operation.
Innovation Solution
A first wall made of a liquid metal mixture comprising lithium and lithium hydride, with suspended pebbles for neutron attenuation and multiplication, and a circulating system using electrodes and magnetic fields to maintain adherence to the wall, allowing for compact design and efficient tritium breeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional fusion reactor designs (ITER, DEMO) are used, then plasma confinement and fusion power generation are achieved, but the reactor size becomes enormous (42-hectare platform, over 70 meters tall) and construction cost becomes excessive (over several billion dollars)
Solution Approach 1:
The patent changes the physical state parameter of the first wall material from solid to liquid, enabling a liquid metal first wall that can be injected and circulated. This parameter change allows the wall to be thinner and more compact while maintaining plasma confinement capabilities, directly reducing reactor size without sacrificing power generation performance
Solution Approach 2:
The patent applies hydraulic principles by using liquid metal flow to form the first wall, replacing conventional solid structural walls. The liquid metal can be circulated and adjusted to maintain optimal plasma confinement, enabling a more compact reactor design that achieves the same fusion power in a smaller volume
2Strength
If conventional solid plasma facing components are used, then structural integrity is maintained, but the components need to be replaced frequently due to high energy exposure and the cost of produced electricity increases
Solution Approach 1:
The liquid metal first wall serves multiple functions simultaneously: it provides plasma confinement, acts as a thermal barrier, and enables tritium breeding. The circulating liquid metal can be continuously replenished and maintained, eliminating the need for frequent replacement of solid components and reducing operational costs
Solution Approach 2:
By changing the material state from solid to liquid, the first wall can be continuously circulated and maintained at optimal temperatures and pressures, extending component lifespan and reducing replacement frequency while maintaining structural integrity through controlled liquid metal flow
3Volume of stationary object
If liquid metal is used as a first wall, then smaller and lower cost components are achieved, but the liquid metal requires complex containment and circulation systems that increase device complexity
Solution Approach 1:
The liquid metal first wall performs multiple functions within a single component: plasma confinement, thermal management, tritium breeding, and neutron shielding. This multi-functionality reduces the need for separate containment systems and simplifies the overall device structure while maintaining compact size
Solution Approach 2:
By using liquid metal flow dynamics to contain and circulate the first wall material, the system replaces complex solid containment structures with hydraulic control mechanisms, reducing device complexity while maintaining compact first wall dimensions
4Power
If tritium fuel is used for fusion power, then high energy output is achieved, but the fuel cost becomes excessive (30,000 dollars per gram) and operational costs increase
Solution Approach 1:
The liquid metal first wall contains lithium isotopes that can capture neutrons and breed tritium in-situ, making the system self-sufficient in tritium production. This eliminates the need for external tritium supply and reduces operational costs associated with expensive fuel replacement
Solution Approach 2:
By changing the composition parameter of the liquid metal to include specific lithium isotopes, the system enables tritium breeding through neutron capture reactions, transforming from a tritium-consuming system to a tritium-producing system that reduces fuel costs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables smaller, more efficient fusion reactors with reduced maintenance and lower operational costs by providing a compact first wall that acts as a breeding blanket, offering adjustable neutron absorption and multiplication, and improving structural longevity.
Implementation Method 1
lithium hydride first wall device may be listed as: allow for much more compact first wall in a fusion reactor... there is no need for a separate lithium breeding blanket because the first wall also acts as the breeding blanket... it is possible to modify the amount of attenuation or absorption of neutrons
Implementation Method 2
a first wall device adapted to form a first wall according to an embodiment, wherein the device comprises: a vessel comprising an inner wall; flowing means adapted to form a flow of a liquid metal mixture on the inner wall... electrodes located on the inner wall of the vessel, the electrodes being adapted to applying an electric current to the liquid metal mixture of the first wall
Implementation Method 3
flowing means adapted to form a flow of a liquid metal mixture on the inner wall... adapted to circulating the liquid metal mixture at high temperatures
Data Source
AI summary
The present disclosure relates a first wall adapted to cover an inner wall (113) of a vessel (106), the first wall being made of a liquid metal mixture (111) comprising at least lithium and lithium hydride.