In this instance I would define DAC as a machine based process to extract CO2 from the air. Examples would be Lackner’s and Eisenberger’s machines to do this. There would be very good economic drivers to not tie this to electricity generation and to simply use the reactor to just generate heat below 1000C. Once you move into temperatures that raise steam above 1 bar, the cost of the plant and the required materials rises greatly. Equally the electric equipment and associated contracts and switching gear for supply greatly raise the cost and complexity of the project. If you really want to drive the cost down for the supplied heat, use a small reactor of standard design such as a pool reactor and run it at low temperatures. This should be significantly lower capital cost. Equally important, the business model will be simple and this will ease the raising of capital. It was suggested that this might be useful for doing DAC in isolated areas. There would be merit in this. One such example , and you could probably make a good business case for this, would be where CO2 was needed for EOR such as the North Slope of Alaska.
David Sevier Carbon Cycle Limited 248 Sutton Common Road Sutton, Surrey SM3 9PW England Tel 44 (0)208 288 0128 Fax 44 (0)208-288 0129 This email is private and confidential From: Greg Rau [mailto:[email protected]] Sent: 18 September 2017 20:01 To: [email protected]; [email protected]; David Sevier Cc: Andrew Lockley; geoengineering Subject: Re: [geo] nuclear powered DAC Just to back up a bit, what exactly qualifies as DAC? Greg _____ From: Klaus Lackner <[email protected]> To: "[email protected]" <[email protected]>; David Sevier <[email protected]> Cc: Andrew Lockley <[email protected]>; geoengineering <[email protected]> Sent: Monday, September 18, 2017 11:47 AM Subject: Re: [geo] nuclear powered DAC Yes, it could be used to provide low grade heat. Particularly in remote areas. Whether it is cheap enough is not clear to me. From: <[email protected]> on behalf of Peter Eisenberger <[email protected]> Reply-To: Peter Eisenberger <[email protected]> Date: Monday, September 18, 2017 at 7:25 AM To: David Sevier <[email protected]> Cc: Andrew Lockley <[email protected]>, geoengineering <[email protected]> Subject: Re: [geo] nuclear powered DAC Cogenerating DAC and nuclear power if nuclear power produces low cost electricity where the low temperature heat such facilities struggle to get rid of is used to run DAC makes alot of sense. Not sure that their are not lower cost ways to generate low temperature heat. By the way something not mentioned much is nuclear fusion. Once nuclear fusion (mimicking solar reactions of the sun on the earth ) is proven commercially removing enfvironmental and other issues that plaqued fission reactions alot of the issues of the 24x7 dispatchable renewable energy grid go away by using some mixture of nuclear power and solar/wind . I beleive in the long term fusion will be a major source of our energy. On Mon, Sep 18, 2017 at 5:34 AM, David Sevier <[email protected]> wrote: In light of the thermal energy burden, I am wondering if you could combine a small nuclear pile such as a small modular swimming pool reactor (once described as the only nuclear power plant design that anyone ever made profit from) as a heat source without generating electricity with DAC. A number of DAC processes need heat either at or below 1000C. A small nuclear reactor should be able to supply this. If the requirement to raise steam and generate electricity are removed, the cost of the plant and the cost per KWH of heat should be significantly lower. Such an operation would not make sense in the early years of DAC but later when scale up becomes much larger and the world gets serious about DAC, then this could make sense. Look forward to comments and discussion. Swimming pool reactors had a good safety record (as far as I am aware), were not that expensive to build and were not terrible to decommission. 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