[Gasification] Gasification Digest, Vol 57, Issue 9
BC Jain
bcjain at ankurscientific.com
Mon May 25 22:55:55 CDT 2015
Yes.
BC JAIN
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Subject: Gasification Digest, Vol 57, Issue 9
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Today's Topics:
1. Difference between biomass and coal gasification (Saiteja Chinta)
2. Re: Difference between biomass and coal gasification (Thomas Koch)
3. Re: Difference between biomass and coal gasification (Mano Va)
4. Re: Difference between biomass and coal gasification
(Arnt Karlsen)
5. Re: Difference between biomass and coal gasification (Juan Moreno)
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 May 2015 11:34:08 +0530
From: Saiteja Chinta <chinta.saiteja at gmail.com>
To: gasification at lists.bioenergylists.org
Subject: [Gasification] Difference between biomass and coal
gasification
Message-ID:
<CAH6fn7A8LGFaTVeYZQjBjcJKctX6jRsPA8=vUg5wNGEnytBjqA at mail.gmail.com>
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Hi all,
Thanks for the response, but I am once again stating my question with some
specifications.
I am interested in coal gasification where coal used is with high ash
content and less reactive.
Capacity of gasifier is around 30 Tons of coal per day and technology is
updraft fixed bed.
If the reactor is operated at high temperature to crack any tar, ash would
come out in molten form (Not desired) as conditions will cross ash melting
point.
So in this sense, tar generated after gas cooling be recycled into gasifier?
Regards,
Saiteja
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Message: 2
Date: Mon, 25 May 2015 06:30:06 +0000
From: Thomas Koch <tk at tke.dk>
To: Discussion of biomass pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Difference between biomass and coal
gasification
Message-ID:
<4F20766DE525FF408A7C148DBBD0A91D14489957 at SRV-MAIN.tkenergi.local>
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Hi Saiteja
In an updraft fixed bed gasifier there is no clear link between maximal
temperature and tar content in the gas.
Slagging takes place in the oxidizing zone in the bottom of the reaction
zone, tar is made in pyrolysis zone in the top of the bed.
If you observe slagging you can inject water together with the air ? eg if
you use a water scrubber as part of you gas cleaning you have a fraction to
get rid of. That is one way to reduce the temperature.
There Is a lot of reports from the development of the V?lund updraft
gasifier in Harbo?re that vould be very relevant for you to read.
http://www.res-chains.eu/wp-content/uploads/2013/04/Case-Study-Gasification-
Harbo%C3%B8re.pdf
Thomas
Fra: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] P?
vegne af Saiteja Chinta
Sendt: 25. maj 2015 08:04
Til: gasification at lists.bioenergylists.org
Emne: [Gasification] Difference between biomass and coal gasification
Hi all,
Thanks for the response, but I am once again stating my question with some
specifications.
I am interested in coal gasification where coal used is with high ash
content and less reactive.
Capacity of gasifier is around 30 Tons of coal per day and technology is
updraft fixed bed.
If the reactor is operated at high temperature to crack any tar, ash would
come out in molten form (Not desired) as conditions will cross ash melting
point.
So in this sense, tar generated after gas cooling be recycled into gasifier?
Regards,
Saiteja
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Message: 3
Date: Mon, 25 May 2015 13:18:38 +0530
From: Mano Va <gmmanovassm at gmail.com>
To: Discussion of biomass pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Difference between biomass and coal
gasification
Message-ID:
<CAKVVU5GZpJcD-EPkAGvXUGnibvG9E6LWjcwcW2vJcPxW7j+-CA at mail.gmail.com>
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HI Saiteja Chinta
I want to sare some points with u
I am interested in coal gasification where coal used is with high ash
content and less reactive
** High Ash content Leads to more Clinker formation *
** Its Difficult to continues operation*
Capacity of gasifier is around 30 Tons of coal per day and technology is
updraft fixed bed
**1.25 ton /hr Updraft Leads to more tar formation*
If the reactor is operated at high temperature to crack any tar, ash would
come out in molten form (Not desired) as conditions will cross ash melting
point.
**If u maintained high temperature also in updraft moisture content and
pyrolysis zone Tar wapers are mixed with gas*
So in this sense, tar generated after gas cooling be recycled into gasifier?
*May be Make some pellet form can reuse that tar mix with coal powder *
On Mon, May 25, 2015 at 11:34 AM, Saiteja Chinta <chinta.saiteja at gmail.com>
wrote:
> Hi all,
>
> Thanks for the response, but I am once again stating my question with
> some specifications.
>
> I am interested in coal gasification where coal used is with high ash
> content and less reactive.
>
> Capacity of gasifier is around 30 Tons of coal per day and technology
> is updraft fixed bed.
>
> If the reactor is operated at high temperature to crack any tar, ash
> would come out in molten form (Not desired) as conditions will cross
> ash melting point.
>
> So in this sense, tar generated after gas cooling be recycled into
> gasifier?
>
> Regards,
>
> Saiteja
>
> _______________________________________________
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>
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>
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> http://gasifiers.bioenergylists.org/
>
>
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Message: 4
Date: Mon, 25 May 2015 11:10:22 +0200
From: Arnt Karlsen <arnt at iaksess.no>
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Difference between biomass and coal
gasification
Message-ID: <20150525111022.0f7b80bc at nb6.lan>
Content-Type: text/plain; charset=US-ASCII
On Mon, 25 May 2015 11:34:08 +0530, Saiteja wrote in message
<CAH6fn7A8LGFaTVeYZQjBjcJKctX6jRsPA8=vUg5wNGEnytBjqA at mail.gmail.com>:
> Hi all,
>
> Thanks for the response, but I am once again stating my question with
> some specifications.
>
> I am interested in coal gasification where coal used is with high ash
> content and less reactive.
>
> Capacity of gasifier is around 30 Tons of coal per day and technology
> is updraft fixed bed.
..can this be modified to fit e.g. a 1 - 2 meter tall "battery of Imberts"
inside your current reactor vessel? I haven't made up my mind on the ideal
sizes for my gasifier and I have a few ideas I'd like to try out.
..regardless of sizes, the hot section of my gasifier is going to be about
1 to 2 meters tall, and I'd like to consentrate on that rather on the other
junk I need to test my ideas.
> If the reactor is operated at high temperature to crack any tar, ash
> would come out in molten form (Not desired) as conditions will cross
> ash melting point.
..in my gasifier (75kWe-300kWth "V-hearth Imbert" with tar vapor flare on
top of the combustion zone "lens") I simply draw my tar vapors off my fuel
hopper that sits on top of my combustion zone "lens", pipe it and some air
straight down into my flare and use the combustion zone "lens" to ignite and
burn my tar vapors, this also agitates and stabilizes the Imbert combustion
zone "lens."
..for updraft, this becomes a little harder, as you have tar vapors "all
over" your gas, and not just in your fuel hopper.
> So in this sense, tar generated after gas cooling be recycled into
> gasifier?
..your tar vapors generated in your gasifier and then condensed into tar
droplets when you cool your gas.
..with your upstream gasifier, you have to clean your entire product gas
stream, how much does that cost?
..with my setup, I keep my tar vapors away from my product gas, instead I
use them to heat, agitate and stabilize my "Imbert"
combustion zone, and then to fuel it, around 2/3 to 4/5 of it.
> Regards,
>
> Saiteja
--
..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...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.
------------------------------
Message: 5
Date: Mon, 25 May 2015 08:37:05 -0300
From: Juan Moreno <juan.moreno at umag.cl>
To: Discussion of biomass pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Difference between biomass and coal
gasification
Message-ID: <55630961.3090808 at umag.cl>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
1. You want to adapt a biomass gasifier to coal gasifier?
2. If you have high ash coal, you know the components of these ashes, as
many inorganic can catalyze your reaction and behave in a better way.
3. What is the calorific value of your coal, will be the subbitominosos
type.
4. Do you know which is the melting point of your ashes?
Juan Moreno
El 25-05-2015 a las 6:10, Arnt Karlsen escribi?:
>> Hi all,
>> >
>> >Thanks for the response, but I am once again stating my question with
>> >some specifications.
>> >
>> >I am interested in coal gasification where coal used is with high ash
>> >content and less reactive.
>> >
>> >Capacity of gasifier is around 30 Tons of coal per day and technology
>> >is updraft fixed bed.
> ..can this be modified to fit e.g. a 1 - 2 meter tall "battery
> of Imberts" inside your current reactor vessel? I haven't made
> up my mind on the ideal sizes for my gasifier and I have a few
> ideas I'd like to try out.
>
> ..regardless of sizes, the hot section of my gasifier is going
> to be about 1 to 2 meters tall, and I'd like to consentrate on
> that rather on the other junk I need to test my ideas.
>
>> >If the reactor is operated at high temperature to crack any tar, ash
>> >would come out in molten form (Not desired) as conditions will cross
>> >ash melting point.
> ..in my gasifier (75kWe-300kWth "V-hearth Imbert" with tar vapor
> flare on top of the combustion zone "lens") I simply draw my tar
> vapors off my fuel hopper that sits on top of my combustion zone
> "lens", pipe it and some air straight down into my flare and use
> the combustion zone "lens" to ignite and burn my tar vapors, this
> also agitates and stabilizes the Imbert combustion zone "lens."
>
> ..for updraft, this becomes a little harder, as you have tar vapors
> "all over" your gas, and not just in your fuel hopper.
>
>> >So in this sense, tar generated after gas cooling be recycled into
>> >gasifier?
> ..your tar vapors generated in your gasifier and then
> condensed into tar droplets when you cool your gas.
>
> ..with your upstream gasifier, you have to clean your
> entire product gas stream, how much does that cost?
>
> ..with my setup, I keep my tar vapors away from my product gas,
> instead I use them to heat, agitate and stabilize my "Imbert"
> combustion zone, and then to fuel it, around 2/3 to 4/5 of it.
>
>
>> >Regards,
>> >
>> >Saiteja
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