To list:, cc Greg
I like what I read about the productivity of the brown seaweed, but as
Greg points out, there is nothing of a geoengineering character in this article
(not read because it is behind a pay wall and doesn't seem pertinent to my
interests). Adding to Greg's short list, I would add biochar production (via
pyrolysis, not gasification) as a possible better use of the seaweed (sizable
output of useful CO, not CO2, simultaneous with H2 and char). But also should
be considered is HTC (Hydrothermal Carbonization) which welcomes a wet
feedstock and produces almost no CO2 - yielding mainly (useful hot) H2O and a
mostly carbon output. This process yields a more labile product - but some
swear it is good enough for serious sequestration. There are an amazing number
of ways to process biomass - but on this list, I hope we emphasize production
of recalcitrant forms of carbon. This article does not.
There is some good giant algae work going on in Australia - and not
enough worldwide.
Ron
On Sep 16, 2014, at 11:51 AM, Rau, Greg <[email protected]> wrote:
> Add CCS or preferably AWL to get C negativity. Figure out a way to
> cost-effectively harvest biomass and recycle nutrients, and you might have
> something, pending rigorous analysis from our ethics experts.
> Greg
> Steam co-gasification of brown seaweed and land-based biomass
>
> <image001.png>
>
> <image002.gif>
>
> DOI: 10.1016/j.fuproc.2013.12.013
>
> Get rights and content
>
>
> Highlights
>
> *
>
> Excellent self-catalytic effect was found in steam gasification of seaweed.
>
> *
>
> More gas was produced from seaweed than land-based biomass.
>
> *
>
> Addition of brown seaweed in land-based biomass promoted gasification rate.
>
>
> Abstract
>
> Alkali and alkaline earth species in biomass have self-catalytic activity on
> the steam gasification to produce hydrogen-rich gas. In this study, three
> types of biomass, i.e., brown seaweed, Japanese cedar, apple branch
> containing different concentrations of alkali and alkaline earth species, and
> the mix of both of them were gasified with steam in a fixed-bed reactor under
> atmospheric pressure. The effects of reaction temperature, steam amount and
> mixing ratio in co-gasification on gas production yields were investigated.
>
> The results showed that higher gas production yields (especially for H2 and
> CO2) were obtained when the brown seaweed was used than the other two types
> of biomass since the ash content in brown seaweed was much higher than in
> land-based biomass and contained a large amount of alkali and alkaline earth
> species.
>
> The yield of hydrogen increased with an increase in the amount of steam, but
> excessive steam use reduced the hydrogen production yield. From the
> co-gasification experiments, the gas production yields (especially for H2 and
> CO2) from the land-based biomass increased with the increase in brown seaweed
> ratio, suggesting that the alkali and alkaline earth species in brown seaweed
> acted as the catalysts to enhance the gasification of land-based biomass in
> co-gasification process.
>
>
> Graphical abstract
>
> <image003.jpg>
>
> Keywords
>
> Biomass;
>
> Steam gasification;
>
> Co-gasification;
>
> Seaweed;
>
> Alkali metals;
>
> Alkaline earth metals
>
>
>
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