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orbuch's profile
Ryan Orbuch
Ryan Orbuch
Ryan Orbuch
Verified account
@orbuch

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Ryan OrbuchVerified account

@orbuch

unlearned helplessness | climate @lowercarbon, previously @stripe

NYC etc
orbuch.com/carbon-removal
Joined December 2011

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    Ryan Orbuch‏Verified account @orbuch 21 Jul 2020

    Ok so why can’t you take a coal plant, flip the smokestack upside down, and emit all the flue gas straight into a geologic injection well? Skip the amine scrubbing, heat exchange, all the complicated expensive stuff.

    7:49 AM - 21 Jul 2020
    • 34 Likes
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    10 replies 0 retweets 34 likes
      1. New conversation
      2. Alex Sexton‏ @SlexAxton 21 Jul 2020
        Replying to @orbuch

        I assume itd work for a minute and then reverse due to pressure?

        1 reply 0 retweets 0 likes
      3. Ryan Orbuch‏Verified account @orbuch 21 Jul 2020
        Replying to @SlexAxton

        nah there’s tons of space and gas injection is a thing we do all the time afaik

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. José Luis Ricón Fernández de la Puente‏ @ArtirKel 21 Jul 2020
        Replying to @orbuch

        Answers would be: too expensive, or unworkable (volume of flue too large), at least in-situ (maybe you would need to colocate the plant near a place that can hold that much gas.

        1 reply 0 retweets 3 likes
      3. José Luis Ricón Fernández de la Puente‏ @ArtirKel 21 Jul 2020
        Replying to @ArtirKel @orbuch

        (Not that I've checked the, but the space of possible answers seems to be those two as key suspect)

        1 reply 0 retweets 2 likes
      4. Show replies
      1. Matt Zieger  💬‏ @mattzieger 21 Jul 2020
        Replying to @orbuch

        As it’s gaseous, wouldn’t you need to pressurize the injection? What pressure can an injection well hold? Liquid injection hydro-fractures and expands volume, gas?

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. freak in the spreadsheets‏ @mattbasta 21 Jul 2020
        Replying to @orbuch

        If you flip the smokestack upside down the plant takes in CO2 and outputs coal. Engineering 101 ryan

        1 reply 0 retweets 5 likes
      3. Ryan Orbuch‏Verified account @orbuch 21 Jul 2020
        Replying to @mattbasta

        you’re hired

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. Pol Knops‏ @GreenOlivine 21 Jul 2020
        Replying to @orbuch

        A few reasons: - costs: You would need to compress the whole flue gasses. Instead of only 10%. - when CO2 is compressed it becomes liquid. The other gasses at other temp/pressure. - the CO2 will either dissolve in the formation water or react to carbonates. The other gasses not

        2 replies 0 retweets 4 likes
      3. Ryan Orbuch‏Verified account @orbuch 21 Jul 2020
        Replying to @GreenOlivine

        So in traditional power plant CCS they’re actually injecting a liquid? Does that mean you use a gravity-fed well?

        1 reply 0 retweets 0 likes
      4. Show replies
      1. New conversation
      2. Mackenzie Burnett‏ @ciaomack 21 Jul 2020
        Replying to @orbuch

        You can’t inject unprocessed flue gas into the ground because it doesn’t store long term (will likely bubble back up, undoing the effort) and is dangerous (could erupt violently and/or suffocate nearby people with a sudden excess of CO2)

        1 reply 2 retweets 20 likes
      3. Mackenzie Burnett‏ @ciaomack 21 Jul 2020
        Replying to @ciaomack @orbuch

        That’s why you process it into a supercritical fluid, which is much more dense than a gas but requires 3-4x more energy if you don’t separate out the nitrogen and would therefore be a lot more expensive than just doing separation in the first place

        2 replies 0 retweets 7 likes
      4. Show replies

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