[Gasification] Straw Fueled CHP

Tue Dec 26 12:16:52 CST 2017

Greg,

As long as you have a way of removing the clinkered ash and breaking it up you can make gas. Components in straw sinter and melt at about 750 ⁰C. Oxidation temperatures are typically 1000 ⁰C. In a downdraft gasifier you concentrate the slagging components in the char and either sweep it through with unreacted char or melt it. For that reason most gasification of crop residues has historically been with updraft gasifiers with active grates. 

You’ll find a review of “Commercialization Development of Crop Straw Gasification technologies in China” open access at http://www.mdpi.com/2071-1050/6/12/9159 (Zhang 2014 in Sustainability). The current development in China is to pyrolyze the crop straw with external heat and convert the char to a biochar fertilizer. 

Rice husk gasifiers proliferated in Cambodia and Myanmar during periods of high diesel prices.  Simple downdraft models were built with wet scrubbers. At one point effluent from the scrubbers caused severe pollution problems in Myanmar. Environmental impacts were analyzed in Cambodia. High temperatures created cristobalite silica issues in some gasifiers. There are some good analyses of the performance of these systems. Many are copies of the Ankur Scientific (India) gasifier. Most of the gasifiers fuel low cost engines that are replaced or substantially rebuilt after a year or two. Many generate electricity. Small systems run line shafts that power rice milling equipment. 

Tom     

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Greg Manning
Sent: Tuesday, December 26, 2017 8:57 AM
To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Straw Fueled CHP

Greetings Doug and list, 

I hope all is as well as can be as we all age like fine wine. 

In the interest of the original post about straw gasification, I am going to attempt a sample run in my latest unit out of curiosity, I think going the route of cubed wheat straw would be the way to go, what are your thoughts on this ?

Greg Manning

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On Mon, Dec 25, 2017 at 12:36 PM, Doug <doug.williams.nz at gmail.com <mailto:doug.williams.nz at gmail.com> > wrote:

Hi Gasification Colleagues,

As each year passes, watching requests for proven gasification technology, is like watching the movie "National Ground Hogs Day" where the main character relives the same day over and over gradually correcting his mistakes until he gets the outcome he targets (the girl of course).  There is enough collective experience already in the World to solve just about every permutation of waste biomass use, except how to handle it's huge volume in the place it where it grows, and for a price which must equate to practically nothing.

Yes we can as individuals make things that work for our own edification, but this does not translate to making it work on the scales required by those just discovering biomass conversion.  Far from being a cornucopia ( a Horn of Plenty) it's more the other way of working like a funnel, in which you have to literally stuff bulk $$$ first, then all the "free waste" that must reach the funnel without cost. But, we don't really give up do we?

It's always good to find and refer to what appear to be examples of proven technologies, but few can really meet their own predictions of reliability when put to scrutiny. Take a hard look before you part with your $$$.

This year, I rebuilt my Pioneer Class gasifier down the back shed while I can still see to weld, and visited the CalForests Biochar maker project in California in July to commission a hot pyrolysis gas suction system. We are still trying to stuff a forest into a funnel, so in an eye blink things can go crazy, a single raw chip is failure!  I will try to get the photo file up on the Fluidyne Archive albeit six months late shortly.

On the side, I still study and ponder what secrets still remain as applications for these differing chars,  and continue my other life  as a therapist, researching pain.

Best Wishes to you all for the Festive Season.

Doug Williams,

Fluidyne.  

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