Supersonic Man

June 21, 2018

hydrogen economy? how about methane instead?

Filed under: Hobbyism and Nerdry,science!,the future! — Supersonic Man @ 4:52 pm

Ever since the seventies, there’s been an idea floating around that someday, in order to replace fossil fuels, we’d start using hydrogen as our main chemical fuel.  We’d have hydrogen tanks instead of gasoline tanks, and hydrogen pipelines instead of natural gas pipes.  The hydrogen would be produced from water with either renewable or nuclear energy sources, and then whenever we needed a chemical fuel, we’d use hydrogen.  And wherever we needed a portable source of electric power, we’d use hydrogen fuel cells.  Our cars might be fuel cell powered, for instance.

Since then, fuel cell cars have advanced pretty well, and building a fleet of electric cars which get their power from hydrogen fuel cells looks fairly doable.  There are even some demo filling stations which allow you to fill up a fuel cell car with hydrogen, if you have one of the test vehicles.

So that part is doable, though nobody’s sure if there’ll be any need for it.  Cars might do just as well by simply using batteries, and plugging in to charge, as many people do today.  Making a new network for delivering hydrogen to cars might be an unnecessary expense.

But what about all the other things we use fossil fuel for, besides transportation?  What about heating our houses, and fueling our stoves and ovens?  Could we, for instance, substitute hydrogen for natural gas?

I think the answer is that we could, but maybe we shouldn’t, because there’s a better idea.  An approach which lets us keep using the natural gas infrastructure that we already have.  Switching to hydrogen would entail replacing most of it, because a pipe or a valve that safely contains natural gas can easily fail at containing hydrogen.  Since it is the lightest of all gases, one of its properties is that it can find its way through leaks which, to any ordinary gas, aren’t leaks at all.  Every piece of every pipe, and every valve in every appliance, would have to be either carefully tested, or replaced.

We can avoid all that with one simple step: taking the hydrogen we produce and converting it into methane.  Natural gas is 95% methane, and if we make it artificially, it could be used as a direct replacement for gas.  And the way we’d do that is with a process called the Sabatier reaction.  In this process, hydrogen is combined with carbon dioxide by means of a metallic catalyst.  The oxygen is stripped off of the carbon atoms and hydrogen takes its place.  The result is methane, plus leftover oxygen.

The best part is where we get the carbon dioxide: out of the atmosphere.  At first, we could take it directly from the smokestacks of industries which still burn fossil fuel.  (Steelmaking, for instance, might have a hard time using anything but coal.)  Later, as the scale increases, we could just separate it out of regular air.  This makes your home’s stove and furnace and water heater carbon neutral.

With some further chemical processes we could probably convert the methane into longer chain hydrocarbons, producing oils and so on — substitutes for things like butane or kerosene or diesel or gear oil… or even gasoline for classic car enthusiasts.

Between battery cars and methane conversion, maybe there wouldn’t be all that big a market for straight pure hydrogen.  It would definitely have some uses, but I don’t think all that big a part of our energy supply would be used in hydrogen form.  We might, however, use hydrogen to store solar energy from midday for use at night.  Such hydrogen might be produced directly by vats of algae, then fed to stationary fuel cells as the sun sets.

If a big methane convertor works, we should of course encourage its use.  We’ll have tax credits for making carbon-neutral methane, and penalties for fossil fuels.  The rival approach of getting gas by fracking might even be banned outright, because of its harmful side effects.  This assumes, of course, that at some point we overcome the reactionary political forces who want to prop up the oil and coal industries, and let all the profitable advances in renewables be done overseas.

One cool thing is that methane making machines are being developed right now, as part of the space program.  Not NASA’s space program, but SpaceX’s private program.  They’re building it for future Martian explorers and colonists, so they’ll be able to make their own rocket fuel for flights back to Earth.  Who knows, maybe at some point they’ll use the machine to fuel rockets here as well  so they can say they have carbon neutral satellite launchers.  Both of the major reusable rocket companies say methane is the fuel they want to use.

Of course, some other rockets will keep on using hydrogen.

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November 18, 2016

future cars

Filed under: Hobbyism and Nerdry,the future!,thoughtful handwaving — Supersonic Man @ 8:05 pm

A lot of people who talk about the coming future of post-petroleum vehicles like to pooh-pooh the battery electric car, even though it’s the most successful type so far.  They keep insisting that the real future will belong to hydrogen fuel cells or ethanol or something else exotic.

But consider the following vision for a future car:

It’s an affordable compact or midsize, nothing fancy.  The base model comes with an electric motor for each front wheel, and 25 or 30 kilowatt-hours of batteries layered under the floor.  This arrangement keeps the powertrain out of the way, so it can have a trunk at both ends, like a Tesla.  Its range is at most a hundred miles, so it’s fine for commuting and shopping and local excursions, but very inconvenient for a road trip.

Most people accustomed to gasoline cars would find this disappointing.  But consider the upgrades you could buy for it.  If you want sure-footedness in snow, or more performance, add a pair of rear motors.  (They would be smaller than the front ones, unless you’re doing some aggressive hot-rodding.)  If you want longer range, you could have a second battery pack in place of your front trunk.  And… if you want to drive everywhere and refuel with gasoline, you could replace that front trunk or second battery with a small gasoline engine and a generator.  It would be no bigger than a motorcycle engine, because it would only need to produce twenty to thirty horsepower to keep your batteries from draining while cruising down a highway.  Ideally it would be a turbine rather than a piston engine, as it would only run at one speed.

Or if gasoline goes out of fashion, you could use that space for a fuel cell and a hydrogen tank.  Again, it would produce only a steady twenty or thirty horsepower.  Or there could eventually be other alternatives not well known today, such as liquid-fueled batteries which you refill with exotic ion solutions, or metal-air cells fueled with pellets of zinc or aluminum.

These would not have to be options you choose when buying the car, but could just as easily be aftermarket modifications.  They simply bolt in!  Anyone with a hoist could swap them in minutes, because the only connections needed are electrical, not mechanical.  Even the front trunk would just be a bolted-in tub.  With a good design, these power options might be interchangeable easily enough that people could just rent such an add-on as needed, rather than buying it.  It might be cheaper than, say, renting another car for a vacation trip.

Another option might be to install stuff from below.  There have been plans to make a network of stations where a machine just unclips your empty battery and slots in a full one, from underneath.  With forethought, this car could be made compatible with such a system.

The point is, once you have the basic platform of a battery-electric car, it can be cheaply adapted to run on any power source.  You could run it with coal, or with thorium, if you’re crazy enough.  Whatever becomes the most economical and abundant power storage medium of the future, your existing car can take it onboard.  All you need is to make sure it has some unused room under the hood.

And the best part?  Even if you don’t add anything, you still have a plug-in car that’s perfectly okay for most everyday uses.  In fact, I suspect a lot of people might come to prefer the car with no add-on, because it’s lighter and quicker and more efficient and cheaper that way, and it has two trunks.

November 6, 2016

the obsolescence of labor

Filed under: Rantation and Politicizing,the future!,thoughtful handwaving — Supersonic Man @ 5:29 am

This article has been promoted to my website, here.

October 13, 2016

a pre-post-mortem of the 2016 Republican debacle

Filed under: Rantation and Politicizing,the future!,thoughtful handwaving — Supersonic Man @ 3:07 pm

It is now 24 days before the 2016 election, and the Democrats seem very likely to have a solid victory, retaining the Presidency and gaining a number of House and Senate seats.  Their popular vote advantage is expected to be around six percentage points, according to current polling aggregates… but there are now hints and rumors and suspicions which suggest a broader and more lopsided victory than that could be coming.  Trump’s support is continuing to erode, and in early voting, Republican enthusiasm seems low.

[Post-election update: yeah, I look like an idiot now.  But I think most of what I wrote below remains valid.]

If that does happen, it’s traditional for the punditry, and the parties themselves, to do a post-mortem to try to figure out what went wrong and how to fix it.  I figure I’ll just do it ahead of time.

So, what is to blame for the crushing defeat that the Republican Party just experienced (hypothetically) in the 2016 election?

(more…)

August 17, 2016

will there ever be a material to replace steel?

Filed under: science!,the future!,thoughtful handwaving — Supersonic Man @ 12:14 pm

This post has been promoted to my website, here.

 

March 28, 2016

some fatuous computer industry predictions

Filed under: Hobbyism and Nerdry,the future! — Supersonic Man @ 11:15 am

I think I’ll call some trends in where the computer industry is going to go in the coming years. And yes, these are pulled straight from my lower gastrointestinal tract.

  • Is Windows going to start dying off?  Yes, but it will be very slow.  Home use will disappear before office use.
  • What will replace it?  A windowed variant of Android, or something Android-compatible, which doesn’t even exist yet.
  • Will that be Google’s planned merger of Android with ChromeOS?  Maybe, but I think it may be more likely to come from an independent outfit.  And if it’s advertised as being half Android and half ChromeOS, it’ll really be 90% Android.
  • Will ARM architecture replace Intel ’86 architecture?  Yes, but only temporarily.
  • Then what will win out in the long term?  Something designed for massive parallelism, like a GPU.  I predict that in The Future, when comparing the size and power of different computers, the main stat that will be quoted is the number of kilocores.
  • Will these cores be similar to full-blown processors such as an ARM core, or will they be more basic and stripped-down like a GPU core?  I think the trend may be from the former toward the latter — quantity over quality.
  • Will we still be using Android variants when things get into kilocore country?  Nah, something fundamentally more advanced will replace the whole current idea of desktop-like interfaces.
  • Will neural networks be important?  Maybe.  They’ll remain a specialized minority of architectures, but I think as the massively parallel architecture evolves toward having more cores and less in each core, it will converge toward neural-net architecture and then replace it.
  • What about software?  I think it will be stored in portable binary format and adapted to individual architectures with JIT compilation and/or automatic local optimizers.  The actual coding of highly parallel algorithms will rarely be done by hand, and will usually depend heavily on automated assistance.
  • What about quantum computing?  It’s impossible to tell how big an impact it will have.  It’s essentially a form of analog computing, and as such may be confined to niche specialties… but you never know: it could end up beating conventional computing at its own game and become much more general-purpose.  If this happens, the need for automated assistance in coding goes double.
  • Will we eventually use computers through direct brain interfaces?  Yes, but progress toward that will be frustratingly slow and gradual.
  • Will these new architectures lead to Artificial Intelligence?  Yes, though in a quite limited sense for the shorter term.  See this article for how I think that will go.
  • Does this mean that a computer will take your job?  It sure does, and it’s going to be a very difficult social challenge to adapt to.  See this further article.

February 9, 2016

Batteries

Filed under: Hobbyism and Nerdry,the future!,thoughtful handwaving — Supersonic Man @ 11:45 am

Battery technology is going to be extremely important to our future.  If someone just came up with a rechargeable battery that improved the energy density of lithium-ion cells by a factor of, say, about six, the effects would be tremendous.  It wouldn’t just suddenly make the electric car really competitive with fossil-fuel powered cars, it could pretty near wipe out small internal combustion engines altogether.  Motor scooters, lawnmowers, maybe even chainsaws would go electric, as would heavy trucks and buses.  The reduction of air pollution would be dramatic.  Vacuum cleaners would start going cordless.  Laptop computers could start being as powerful as desktops.

We could build robots that could walk around for longer than fifteen minutes before needing to plug themselves in.  We could make strength-enhancing exoskeletons.  All kinds of high powered portable doodads.

Also, the economics of shifting from fossil fuels to renewables would become a lot more attractive than they already are.

March 1, 2015

winding down

Filed under: life,the future!,thoughtful handwaving — Supersonic Man @ 7:26 pm

Nobody reads this blog. Even the index page of my personal website gets a lot more interest than this blog does. Even my secondary website for superhero movies does.  The only time I get a noticeable number of readers here is when I link a post from social media.

And yet, some of my most serious recent writing is here, because today’s social media sites — the ones with people you know on them, anyway — generally suck for long-form writing.  So what I’m doing is extracting the major posts from this blog, and putting them onto my main website as permanent pages.  This makes sense because some of them were already being subjected to repeated revisions.

Since many of these posts were about topics having to do with the future, or at least with science, the new website section where they’re being put is called The Future!.  Check it out.  Back here, meanwhile, a number of posts are now just one line pointers to the website.

There are still some longer posts that haven’t been moved, mainly political ones.  Maybe I’ll grab some of those in a second wave, or maybe not.  Also, lots of bird pictures — I have never updated the ancient photography section of my website to include my current bird photography.  That needs doing someday.

In any case, the point is that I’m no longer going to be investing effort in this blog.  The number of new posts will be significantly reduced and at some point will probably cease.

January 3, 2015

Organics meet Robotics

Filed under: the future!,thoughtful handwaving — Supersonic Man @ 11:21 am

This post has been promoted to a permanent page on my website, located here.

August 28, 2013

automation is going to take our jobs

Filed under: the future!,thoughtful handwaving — Supersonic Man @ 10:28 am

This post has been promoted to a permanent page on my website, here.

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