Compact Steam Generator Powers Modular Energy Storage

Alfa Laval debuts an OTSG built for scalable power-to-heat systems

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Alfa Laval has introduced a compact once-through steam generator (OTSG) designed to support modular molten salt thermal energy storage systems. Tailored for decentralized power-to-heat setups, the system enables industrial operators to convert renewable electricity into thermal energy and later recover it as steam — offering a path away from fossil-based heating without overhauling existing infrastructure.

Instead of separating components like economizers, evaporators, superheaters, and steam drums, the new design integrates these into one streamlined shell. This reduces installation demands, limits spatial footprint, and simplifies system architecture, which is especially valuable in retrofit environments or space-constrained facilities.

Targeted at small-scale and distributed industrial applications, the OTSG provides flexibility for companies looking to stabilize energy use and integrate renewables more effectively into their process heat supply.

Designed for Flexibility, Engineered for Stability

Key to the unit’s performance is its spiral-wound heat transfer surface, which is built to handle rapid cycling and thermal stresses commonly found in intermittent energy storage systems. This helps extend operational lifespan and maintain performance consistency over time.

The generator includes an integrated water separation and recirculation system, ensuring steady steam output even at partial loads—as low as 5%. This low-load operation capability supports fast response times, efficient startup, and minimal hold-up volume, all of which are essential in systems using fluctuating inputs like solar or wind power.

Its modular design also allows for phased deployment across industrial plants, supporting energy scaling without major capital investment. As more companies look to reduce reliance on natural gas, technologies like this one aim to fill the gap with reliable, renewably powered heat solutions.

Environment + Energy Leader