Producing fuels from 1,500 degrees of solar heat: world’s first plant opens in Germany

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• threelonmusketeers@sh.itjust.works ⁨4⁩ ⁨months⁩ ago

  The key chemistry bit:

  The receiver heats a gaseous heat transfer fluid which circulates in a closed loop, delivering the high-temperate process heat to the thermochemical reactor and the thermal energy store. In the reactor, CO2, water vapour, and methane sourced from biowaste are heated with the solar energy over a catalyst which produces a mixture of carbon monoxide and hydrogen known as syngas. This is then piped down the tower to a Fischer-Tropsch unit which converts it into a synthetic crude which a refinery would then process into kerosene for planes, diesel or methanol for ships and trucks, and petrol for cars.

  Fischer-Tropsch process

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  • qjkxbmwvz@startrek.website ⁨4⁩ ⁨months⁩ ago

    Super cool. Chemical fuels (hydrocarbons or even plant oils) have ridiculous energy density, which is nice for e.g. cars but absolutely crucial for fast, long-range air travel. I don’t think we’ll be saying goodbye to jet engines for a long time, and it’s awesome that we have ways of making fuel in a somewhat sustainable fashion.

    The US Navy has experimented with this, but I think the idea is to use nuclear power instead of solar energy. Makes sense for an aircraft carrier with a big reactor and thirsty jets.

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• beetsnuami@slrpnk.net ⁨4⁩ ⁨months⁩ ago

  I‘m not particularly hyped about synthetic fuels, but the application to low-carbon cement seems important to me, if this is possible at the scale required

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  • Diplomjodler3@lemmy.world ⁨4⁩ ⁨months⁩ ago

    There are plenty of applications where batteries simply won’t be sufficient, so synthetic fuels do have a place. Just not in land based transport.

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    • denial@feddit.de ⁨4⁩ ⁨months⁩ ago

      Agreed. Or the heating of buildings and warm water.

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    • chonglibloodsport@lemmy.world ⁨4⁩ ⁨months⁩ ago

      I’d really be interested to see a comparison between the costs of electrifying the rail network vs using synthetic diesel for freight throughout the US.

      Unlike cars or semi trucks, diesel-electric locomotives are extremely efficient. On the other hand, electrifying the many thousands of miles of track that run through large, unpopulated areas of the US seems like a monumental challenge that would yield far fewer benefits over electrifying cars.

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    • evranch@lemmy.ca ⁨4⁩ ⁨months⁩ ago

      Is agriculture land based transport? Short of an actual nuclear tractor, nothing but diesel has the energy density sufficient to run modern scale farms.

      Chatting around the fire we’ve tried to imagine a solution like dragging a cable but with tractors pushing close to 1000HP now that’s about a megawatt. That’s a long, fat cable or an extremely dangerous voltage to drag around a field, probably both. And an insane grid infrastructure to get power to the field borders.

      You wouldn’t believe how much fuel goes into agriculture, to the point where I believe it makes up nearly a third of emissions (possibly including land clearing, can’t remember the details). Synthetic fuels are the only net-zero option.

      Well I’m kind of a fan of the nuclear tractor honestly but I kind of doubt it :)

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• yogthos@lemmy.ml ⁨4⁩ ⁨months⁩ ago

  And by world’s first they mean copying what China’s been doing at scale for years now.

  solarpaces.org/rediscovering-concentrated-solar-p…

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  • poVoq@slrpnk.net ⁨4⁩ ⁨months⁩ ago

    As usual you show a complete lack of reading comprehension as this is about making synthetic fuels with concentrated solar power.

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• palarith@aussie.zone ⁨4⁩ ⁨months⁩ ago

  Isn’t burning fuel still going to create green house gasses?

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  • poVoq@slrpnk.net ⁨4⁩ ⁨months⁩ ago

    Not more than this process took out of the atmosphere before, so they are at least carbon neutral.

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