Fw: GAS-L: Tar measurements and indicators

["shuster" <shuster@zol.co.zw>]

----- Original Message -----
From: shuster <shuster@zol.co.zw>
To: Thomas Reed <tombreed@home.com>
Sent: Sunday, September 02, 2001 7:02 AM
Subject: Re: GAS-L: Tar measurements and indicators


> DEAR TOM,
> FROM WHAT I OBSERVE IS ONE REQUIRES A "BLANKET" OF OXYGEN  RIGHT
> ACROSS THE GASIFIER IN THE OXIDATION ZONE. I.E. NO "SHADOW" AS SOMEONE
APTLY
> DESCRIBED. I AM WORKING ON WHAT I WOULD CALL A FAN
> JET POSITIONED CENTRALLY IN THE GASIFIER.(TWO PLATES ON THE END OF YOUR
AIR
> DELIVERY PIPE WITH OPTIMUM GAP) DELIVERING AIR 360 DEGREES.
> WE HAVE DISCOVERED AN INEXPENSIVE WAY TO MONITOR SOOT TARS ECT.
> IN THE LOCAL VERNACULAR MY STAFF HAVE NAMED THIS "MA-PROPELLER"
> OR "MA-POLICEMAN" ITS MADE FROM THE LID OF A FOOD CAN (SIZE APPROPRIATE TO
> THE DIAMETER OF YOUR GAS PIPES.USING TIN SNIPS RADIALLY CUT FROM THE
> CIRCUMFERENCE
> TOWARDS THE CENTER STOPPING SHORT OF THE CENTER BY ABOUT 10MM.
> .DO THIS 6 TIMES TO CREATE 6 EQUAL SEGMENTS.TWIST EACH SEGMENT OUT OF
> POSITION TO CREATE A "FAN" BLADE.
> DO THE SAME TO 2 MORE LIDS.(YOU SHOULD HAVE PRE-DRILLED A  6 MM HOLE
> IN THE CENTER OF EACH DISK.MOUNT THE  3 LIDS ON A SHORT LENGTH
> OF"ALL THREAD BAR) USING 6 NUTS SECURELY POSITION THE LIDS TO THE BAR
> LEAVING ABOUT 5MM GAP BETWEEN EACH LID.THE MIDDLE LID HAS HAD ITS
> SEGMENTS TWISTED IN THE OPPOSITE DIRECTION TO THE 2 OUTER LIDS.
> INSTALL THE "POLICE MAN" IN THE GAS LINE JUST BEFORE YOUR LAST "JUST
INCASE"
> FILTER.
> IN OUR CASE WE HAVE DUPLICATED GAS PIPES .WE CAN SWITCH DELIVERY
> PIPES DURING OPERATION.E.G. WE CAN AFTER 5 10 OR30 MINUTES OF OPERATION
> SWITCH LINES AND INSPECT THE POLICEMAN.INSPECTION  OF THE
> "MA-PROPELLERS" WILL TELL YOU HOW WELL YOUR FILTER SYSTEM IS WORKING.
> OUR WORK SHOWS US THAT WHAT TARS ETC ESCAPE THE GASIFIER OCCURS
> WITHIN THE FIRST 10 MINUTES OF ENGINE START UP.THERE AFTER ZIP.
> I HOPE THAT THIS SMALL CONTRIBUTION FROM ZIMBABWE IS OF INTEREST
> BEST REGARDS TO ALL
> ASHLEY BELBIN
> GAS AFRICA
> ----- Original Message -----
> From: Thomas Reed <tombreed@home.com>
> To: Weststeijn A <A.Weststeijn@epz.nl>; gasification
> <gasification@crest.org>
> Cc: Robb Walt <rwalt@gocpc.com>; <artsolar@aol.com>
> Sent: Saturday, September 01, 2001 3:10 PM
> Subject: GAS-L: Tar measurements and indicators
>
>
> > Dear Andries, Jerod and all:
> >
> > Tars are the Achilles Heel of biomass gasification and we had better all
> > know how to measure them!
> >
> > I am currently working on calibrating the Bacharach Smoke Meter for
> > determining tar and particulate levels in producer gas, and I will
present
> > the results as a poster at Orlando.
> >
> > Meanwhile, we observe at CPC that tar levels seem to coordinate very
well
> > with methane levels.
> >
> > When methane is 8% (ie fresh from the pyrolysis reaction without
> cracking),
> > tars are in the 1000-100,000 level.
> >
> > When methane is 2% we are below 100 ppm tar.
> >
> > Any comments?
> >
> > TOM REED
> >
> >
> >          Dr. Thomas Reed
> >   The Biomass Energy Foundation
> >  1810 Smith Rd., Golden, CO 80401
> > 303 278 0558;
> > tombreed@home.com; www.woodgas.com
> > ----- Original Message -----
> > From: "Weststeijn A" <A.Weststeijn@epz.nl>
> > To: "'Crest Gasification List'" <gasification@crest.org>
> > Sent: Thursday, August 30, 2001 8:07 AM
> > Subject: GAS-L: Tar sampling and analysis response time
> >
> >
> > > Dear List members,
> > >
> > > From an engineering and operational point of view, I am interested in
> the
> > > attainable response time (cycle time) of a singular tar sampling &
> > analysis
> > > system connected to the outlet duct of a gasifier and/or pyrolysis
> > > equipment.
> > >
> > > When -in reality- different process conditions are imposed on the
> > > manufacturing of product gas or pyrolysis gas in order to optimize
> process
> > > conditions, fuel blend and/or CFB bed make-up, the actual cycle time
of
> > the
> > > tar measurements will greatly determine the progress of the
optimization
> > > work.
> > > Purpose of the optimization work here is assumed to be the
minimization
> of
> > > both gaseous light tars as well as heavy condensable tars.
> > > Both lab work and field work experience is appreciated.
> > > Orders of magitude are also wellcome.
> > >
> > > I realize that for practical conditions two parallel systems can
> > accomplish
> > > more than one singular system.
> > > So, my question is specifically related to the response time of a
> singular
> > > system.
> > >
> > > best regards,
> > > Andries Weststeijn
> > >
> > > -
> > > Gasification List Archives:
> > > http://www.crest.org/discussion/gasification/current/
> > >
> > > Gasification List Moderator:
> > > Tom Reed, Biomass Energy Foundation,  Reedtb2@cs.com
> > > www.webpan.com/BEF
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> > > -
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> > >
> >
> >
> > -
> > Gasification List Archives:
> > http://www.crest.org/discussion/gasification/current/
> >
> > Gasification List Moderator:
> > Tom Reed, Biomass Energy Foundation,  Reedtb2@cs.com
> > www.webpan.com/BEF
> > List-Post: <mailto:bioenergy@crest.org>
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> > http://solstice.crest.org/renewables/biomass-info/
> >
>


-
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