[Gasification] SPAM: Re: Characterization of waste water from biomass gasification equipment: A case-study from Cambodia

linvent at aol.com linvent at aol.com
Thu Jan 7 10:45:13 CST 2016


 Tom,?
	Thanks for the compliment and appreciation. There were hundreds of "pot" trials using a wide variety of treatments, extractions, etc. before the key process was accidentally stumbled on. Other processes have evolved and include the ability to take sea-water to potable with a fraction of the cost of distillation or RO.?
	Assumptions about the tar properties including specific gravity can be quite misleading.?
	One aspect of how to deal with the produced water from a gasifier is to give it the right type of compound definition and once that is reached, it makes it much easier to treat it.?
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.?



-----Original Message-----
From: Tom Miles <tmiles at trmiles.com>
To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org>; 'Pete & Sheri' <spaco at baldwin-telecom.net>
Cc: gasifiers <gasifiers at bioenergylists.org>; biochar <biochar at yahoogroups.com>
Sent: Wed, Jan 6, 2016 7:05 pm
Subject: Re: [Gasification] SPAM: Re: Characterization of waste water from biomass gasification equipment: A case-study from Cambodia

 
 
 
Thanks, Doug.  
 
Corrected link Link http://www.fluidynenz.250x.com/ 
 
A typical solution seems to be to clean as much as you can from the black 
water and then burn off what you can't separate with activated carbon. 
Gasifier char has been shown to be a pretty good filter.   
 
Once suggestion has been to heat the liquid to 100C to vaporize the 
benzenes, etc. and then use the steam to gasify the char. Another has been 
to use vapor compression techniques. We quickly get into tech heavy 
solutions that go beyond the cash flow of a small scale gasifier project. 
One scrubber supplier told me that they won't touch developing scrubbers for 
small gasifiers unless you have a minimum of $150,00 to spend on 
development. They find most developers of small scale gasifiers don't have 
enough money for development of appropriate gas cleaning systems, not to 
mention black water cleanup. You have to appreciate the development work 
that Tom Taylor has done. 
 
Tom   
 
-----Original Message----- 
From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On 
Behalf Of Doug Williams 
Sent: Wednesday, January 06, 2016 5:30 PM 
To: Pete & Sheri <spaco at baldwin-telecom.net> 
Cc: 'Discussion of biomass pyrolysis and gasification' 
<gasification at lists.bioenergylists.org>; biochar at yahoogroups.com; 
gasifiers at bioenergylists.org; 'Doug Williams' <doug.williams.nz at gmail.com> 
Subject: SPAM: Re: [Gasification] Characterization of waste water from 
biomass gasification equipment: A case-study from Cambodia 
 
Hi Pete, 
You ask: 
 
> So---- what if one allowed the scrubber water to sit still for a  
>couple of days?  Would most of the "condensible hydrocarbons" and the  
>tar rise to the top?  (I assume that most that "bad stuff" isn't water  
>soluble.) 
 
Heavier tars float but a lot goes into solution and that's the stuff usually 
containing benzine and other nasties that are difficult to filter.  
 
>Then, could that top layer be sucked off, making for a concentrate that  
>might be easier to deal with?  And, would the remaining "water" be  
>useful in the >scrubber again? 
 
Basically this is how the systems are managed, but the condensate is 
carcinogenic and hard not to be exposed to it over a period of time. 
Depending on what the condensible is, and there are huge variations, it can 
be just very light pyrolysis oil without black tars, or the whole spectrum 
of what is commonly referred to as stack gases. These are a very unstable 
mix of distillates, and over 200 chemical combinations have been identified. 
They don't all survive to condense, but the outcome is the same of creating 
toxic black liquor. Sawdust will mop up pyrolysis oils, and the more 
activated chars after gasification, can be used to filter "some black 
liquor", but having said that, you do need lab analysis to be sure of the 
outcomes. 
>  
> My reason for asking the original question is this: 
>   I have been testing a JXQ-10 for several years now.  I can get it to  
>make enough gas to run an Onan 6.5KW genset for up to about 4 hours per  
>batch, at > about 3KW net, max..  The thing that always ends the run is  
>when the reactor is full of wood chips to the top. 
 
To give you a correct answer, I would need a step by step procedure of 
starting it up and operating it over the four hours. It sounds like an open 
core principle burning the pyrolysis gases in a very shallow layer which 
continually moved upwards towards the incoming air. When it fills to the top 
you must have a cylinder of charcoal left that acts like a plug so it just 
slowly shuts down as the amount of exothermic heat drops away. 
 
> As I watch maximum  power, and I see it begin to drop, I can add a  
>thin layer of wood chips and, IMMEDIATELY to power comes back up.  It  
>appears to me that it's the new wood chips that are the "new" energy  
>source, not the (rapid change in) dissociation of CO2 to CO and O2 or  
>the sudden "new" dissociation of H2O to H2 and O2. 
 
The previous set of answers apply, but you are right in that new chips have 
the pyrolysis gases to sustain the oxidation band as gas will burn first 
turning the wood to char, but as the interface to the flame front keeps 
moving up away from the char, it lacks air to maintain oxidation 
> of the char.  
 
I'm pretty sure that is your situation, but give me the fuel operating info 
and we can then see if I read your description correctly. 
 
I just remembered (must be getting old) I did a report on condensates for 
the Fluidyne Archive with photos. www.fluidynenz/250x.com 
 
Doug Williams, 
Fluidyne. 
 
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