I would tend to differ on that....
"laboratory data" on one gasifier does NOT a bunch make, comparing a poorly
designed gasifier to a top end boiler.... go figure, what next, there
"Really IS" a man in the moon.......
Disinformation at it's finest!
Greg Manning,
Canadian Gasifier Ltd.
Building Hi-Performance Gasifiers, Since 2001
Brandon, Manitoba, Canada
1 (204) 726-1851
-----Original Message-----
From: [email protected]
[mailto:[email protected]]on Behalf Of
[email protected]
Sent: Saturday, September 18, 2010 11:14 AM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Dioxin formation
I have seen data from laboratory research on gasifiers and dioxins were
formed. In fact, significant amounts were formed. In terms of dioxin
formation, the gasifier is likely worse than a good boiler.
Jim Leach
-----Original Message-----
From: Sunil Rawal [mailto:[email protected]]
Sent: Friday, September 17, 2010 10:46 PM
To: 'Discussion of biomass pyrolysis and gasification'
Subject: Re: [Gasification] Dioxin formation
I would say that in practcal way there is always presence of oxygen except
in case of Plasma gasification where temp is very high. If sufficient oxygen
is not there then full burning is not possible and till date there is no
system available which can mix fuel and oxygen perfactly. Sunil Rawal
Achintya Projects & Services, 160 Evershine Mall, Near Mindspace Chincholi
Bunder, Malad (west) MUMBAI 400064 INDIA Cell# 0091-9967064472 Telefax;-
0091 (0)22-42660929 On Fri, Sep 17, 2010 at 8:42 PM, wrote: > As part of the
intermediate step to formaiton of dioxins, it is necessary > to form
chlorine dioxide. In the strongly reducing hydrogen rich environment > of
the gasifier, the oxygen is removed so that this intermediate is not >
formed and dioxins are not formed. In fact, gasifiers are a good method of >
reducing dioxins. > Sincerely, > Leland T. "Tom" Taylor > President >
Thermogenics Inc. > > -----Original Message----- > From: Sunil Rawal > To:
Discussion of biomass pyrolysis and gasification < >
[email protected]> > Sent: Fri, Sep 17, 2010 12:10 am >
Subject: Re: [Gasification] Gasification Digest, Vol 51, Issue 13 > > Dear
All, > > Technically to avoid dioxine, we should prevent reaction of
halogens ( > Florine, chlorine, Iodine, Bromine) with nox and the
temperature most > suitable for it is around 330 to 280 deg cent. So whether
you burn material > in incinerator or plasma gasification process or your
normal furnace, if > you > can aviod the said temperature zone in flue gas
by sudden cooling or > maintaining flue gas above 330 deg cent. to avoid
formation of dioxines. > Another method is scrub out these halogens from gas
at higher temperature > to > avoid formation of dioxine. > > As formation of
dioxene & PCB is based on halogens if raw material is free > of halogen
compound, there is no need to take care of temperature zone. > I have worked
and studied a lot on these issues and what I said above are > only way to
avoid > formation of dioxene. > > Anybody interested in more information may
contact me on my email id > [email protected]. > > Sunil Rawal >
Achintya Projects & Services, > 160 Evershine Mall, Near Mindspace >
Chincholi Bunder, > Malad (west) > MUMBAI 400064 INDIA > Cell#
0091-9967064472 > Telefax;- 0091 (0)22-42660929 > > 2010/9/15 Björn Dahlroth
> > A very important source of chlorine in municipal solid waste is simply
>> foodstuff that contain ordinary table salt. At high temperature sodium >>
chloride will dissociate. The trick to avoid dioxins in the exhaust >> >
from > >> modern incineration plants is first to achieve as complete
combustion >> > as > >> possible and then quick cooling of the flue gas to
decrease >> > recombination > >> plus the use of absorption materials and
catalysts. This is common >> technology today. Thermal gasification would
probably be another >> > story but > >> the important thing is what you get
when you finally burn the gas. >> > Anyways > >> if you work with waste like
MSW the plants have to be very big for >> economical reasons and
gasification followed by any thermal >> > electricity > >> production will
hardly achieve a higher total efficiency then a modern >> incineration plant
where you have pressed up steam data to the >> > possible > >> limits with
such kind of fuel. It is also an unavoidable fact that >> > with > >> common
market price levels for electricity or combined electricity and >> district
heating it will be necessary that waste treatment plants >> > charge > >>
some kind of gate fee. This is what we have to pay to achieve a very >> >
low > >> pollution of the environment. >> Bjorn Dahlroth >> Sweden >>
>> -----Ursprungligt meddelande----- >> Från:
[email protected] >>
[mailto:[email protected]] För >>
[email protected] >> Skickat: den 14 september 2010
21:00 >> Till: [email protected] >> Ämne: Gasification Digest,
Vol 51, Issue 13 >> >> Send Gasification mailing list submissions to >>
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Contents of Gasification digest..." >> >> >> Today's Topics: >> >> 1. Re:
Does anyboday know GEM3T120, waste gasification (Max Kennedy) >> 2. Re: Does
anyboday know GEM3T120, waste gasification >> ([email protected]) >> 3. Re:
Does anyboday know GEM3T120, waste gasification (Arnt >> > Karlsen) > >> >>
>> ---------------------------------------------------------------------- >>
>> Message: 1 >> Date: Mon, 13 Sep 2010 16:56:48 -0700 (PDT) >> From: Max
Kennedy >> To: Discussion of biomass pyrolysis and gasification >> >>
Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>
gasification >> Message-ID: <[email protected]> >>
Content-Type: text/plain; charset=us-ascii >> >> Dioxins are formed from
chlorinated and organic compounds not nitrogen >> containing compounds.
Vinyls are especially bad. >> >> >> >> >> ________________________________
>> From: Arnt Karlsen >> To: [email protected] >> Sent: Mon,
September 13, 2010 1:36:20 PM >> Subject: Re: [Gasification] Does anyboday
know GEM3T120, waste >> > gasification > >> >> ... >> >> ..they and dioxins
etc are produced when you burn fuels >> containing organic nitrogen
compounds. >> >> >> >> ------------------------------ >> >> Message: 2 >>
Date: Mon, 13 Sep 2010 22:38:04 EDT >> From: [email protected] >> To:
[email protected], [email protected] >> Subject: Re:
[Gasification] Does anyboday know GEM3T120, waste >> gasification >>
Message-ID: <[email protected]> >> Content-Type: text/plain;
charset="UTF-8" >> >> from Lewis L. Smith >> >> As I recall from my "boiler"
days, the production of dioxins can be >> > avoided > >> in combustion
processes by ? >> >> [1] Removing chlorinated materials from the feedstock.
>> >> [2] Controlling temperatures, especially those of combustion and >> >
stack > >> gasses. >> >> [3] All of the above. >> >> ### >> >>
>> ------------------------------ >> >> Message: 3 >> Date: Tue, 14 Sep 2010
13:48:00 +0200 >> From: Arnt Karlsen >> To: [email protected]
>> Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>
gasification >> Message-ID: <[email protected]> >>
Content-Type: text/plain; charset=US-ASCII >> >> On Mon, 13 Sep 2010
16:56:48 -0700 (PDT), Max wrote in message >>
<[email protected]>: >> >> > Dioxins are formed
from chlorinated and organic compounds not >> > nitrogen containing
compounds. Vinyls are especially bad. >> >> ..correct (some of these contain
nitrogen ;o)), they are >> broken down in a gasifier in about the same way,
though. >> >> ..some (Danish?) R&D people played with FeCl type acids >> in
char beds to break down freon type gases, I read this >> years back doing
"my homework" on my own gasifier. >> >> -- >> ..med vennlig hilsen = with
Kind Regards from Arnt... ;o) >> ...with a number of polar bear hunters in
his ancestry... >> Scenarios always come in sets of three: >> best case,
worst case, and just in case. >> >> >> >> ------------------------------ >>
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>> >> >> End of Gasification Digest, Vol 51, Issue 13 >>
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