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A question that becomes particularly relevant for "the hydrogen economy" or in the event that IGCC coal baseload electric generation seeks off-peak markets for hydrogen.

I can't seem to locate a breakdown of the costs of Haber Bosch plants adequate to tell me about just the Haber Bosch reaction stage of the plant*.

In particular, I'm interested in the energy consumed to and the capital cost per capacity.

*I did find an IGCC conceptual design paper that proposes a Haber Bosch stage consuming 375MW producing 8731kg/hr implying NH3 would cost 43,000kWh/tonne but that seems quite exorbitant. By contrast, there is another proposal that says 6MW is adequate to produce 1000tonne/day implying a cost of 144kWh/tonne. An additional dataum is capital cost of 3000€/kgh ammonia capacity I located from a slide presentation pdf but it isn't clear whether this includes the air separation unit capital.

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  • $\begingroup$ A significant r\part of the cost is making H, do you mean to ignore that cost ? $\endgroup$ Apr 17 at 16:26
  • $\begingroup$ @blacksmith37 If you exchange the source of H2 from natural gas to something else, this question becomes relevant. $\endgroup$
    – mart
    Apr 17 at 19:47
  • $\begingroup$ I added a motivating sentence at the beginning. $\endgroup$ Apr 18 at 3:48
  • $\begingroup$ @mart so you are saying that without your suggested change, the question is not relevant? $\endgroup$
    – Solar Mike
    Apr 18 at 5:32
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    $\begingroup$ Well I spent several hours doing web searches without being able to find any papers that broke out just H2+N2 => NH3 stage from the electrolyitic and other energy inputs of unrelated stages (such as air separation units, etc.). I could go back over those results and show you what I mean if you like. $\endgroup$ Apr 19 at 23:13

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