[Gasification] ***SPAM*** RE: Question from Philip Pedros

[Tom Miles]

Biosolds are typically gasified in combination with wood or another bulky
biomass. I think the City of Lebanon has incorporated biosolids in their
fuel mix of dry urban wood waste.  Aries Energy purchased a fluidized bed
gasifier developed for biosolids but it is not intended for engine
generation. In about 1985 City of Los Angeles ran three bubbling fluidized
bed gasifiers on dried digester gas. Heat was recovered in a  steam boiler.
The project lasted about five years. There have been many small scale
experiments using dried biosolids in gasifiers for engines. I am not aware
any upgrading the gas.   

 

A few years go Anaergia Inc ran a Biogreen Energy pyrolyzer in which the
dried biosolids from an anaerobic digester were carbonized.  The pyrolysis
gas was put back into the digester using a process patented by Washington
State University. The enriched digester gas was burned in an engine. A
project to build a larger system was announced for the City of Los Angeles
was not built.    

 

Tom

 

From: Gasification <gasification-bounces at lists.bioenergylists.org> On Behalf
Of Pedros, Philip
Sent: Saturday, September 22, 2018 1:56 PM
To: Discussion of biomass pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Question from Philip Pedros

 

Mr. Williams

 

The question was from me and reflects my limited knowledge of gasification,
not the company's.  

 

I did not ask about digester gas being used to generate power, nor am I
aware of digester gas being referred to as syngas, as your statement
implies.  Apparently I should have stated that the feed stock to the
gasifier was thermally dried biosolids.

 

What I asked and what was answered is in point 3 below.  I am not aware of
syngas from a gasifier, with municipal biosolids as the feedstock, directly
fueling a CHP and was asking if it has been done.  

 

Thank you,

Philip Pedros

 

 

 

 

Philip B. Pedros, Ph.D., P.E., BCEE

Technical Lead II

AECOM

250 Apollo Drive

Chelmsford, MA 01824

C: 781 258-8829

 <mailto:Philip.Pedros at aecom.com> Philip.Pedros at aecom.com 

 

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On
Behalf Of Doug
Sent: Saturday, September 22, 2018 4:25 PM
To: gasification at lists.bioenergylists.org
<mailto:gasification at lists.bioenergylists.org> 
Subject: Re: [Gasification] Question from Philip Pedros

 

Hi Philip,

Your question is really in several parts:

1. If you are referring to waste water containing sewage sludge, then yes
you will have the gas present.

2. Untreated Sewage gas (to clarify which syngas you are talking about)
cannot be fed directly into engines without at least a scrubber between the
gasometer storage and engine.

3. The gas calorific value of 120-150 Btu/scf is perfectly adequate to run
an engine and does not need boosting.

4. The technology you seek is already employed at many City Sewage plants,
generating power to run the plant.

5. I suggest you find working installations, there must be quite a few in
the USA.

Can I ask you why you or your organization think this is by your question,
unknown technology?

Regards,

Doug Williams.

 

On 23/09/18 07:49, tmiles at trmiles.com <mailto:tmiles at trmiles.com>  wrote:

Can untreated syngas generated from municipal wastewater sludge be used
directly to generate power?  It is my understanding that the heating value
of untreated syngas (120 - 150 But/scf), is too low to feed directly to
engines and that some type of post treatment to boost the heating value to
190 -200 is typically economically prohibitive.   Any information on such
post treatment and an case studies were this has been done would be
appreciated.

 

Thank you,

Philip Pedros

 

 

 

Philip B. Pedros, Ph.D., P.E., BCEE

Technical Lead II

AECOM

250 Apollo Drive

Chelmsford, MA 01824

C: 781 258-8829

Philip.Pedros at aecom.com <mailto:Philip.Pedros at aecom.com> 

 

 

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