[Gasification] Producer Gas issues in a baking oven
linvent at aol.com
linvent at aol.com
Fri Feb 26 06:28:44 CST 2016
Updraft counter-current systems suffer from intrinsic high tar production and if one burns the tarry gas near the reactor, it may appear to be high in heating value, but really isn't without the tars. There are other factors which may affect the gas heating value after distances and I have seen this when the percent of tar is high.
There are other than downdraft designs that will produce low tar content gas that saves a lot of downstream handling of tars which is never really productive to economics or overall success of gasification. The design doesn't require a briquette feed, can handle MSW, tires, dried sewage sludge and other waste materials.
It is surprising that with the number and preponderance of downdraft, briquette fed gasifiers that you didn't use one, but there are issues with using larger ones of this configuration.
Removing the contaminants from the water can be an issue also, but if you know some basic chemical properties of the mixed tar oil water stream, it can be cleaned up rather easily. Even the low tar content downdraft gasifiers produce contaminants in the gas stream that should be removed prior to engine operation to prevent engine damage, lowered heating value into the combustion chamber. For thermal operations such as an oven, with long distance piping and acid water in the gas, comes corrosion, potential freezing, water accumulation and potential dumping or dripping into the gas combustion area, or blockage of flow in the piping system.
An interesting experience with a high profile gasification and other chemical process modeling group was during a demonstration when they went into great detail about an IGCC coal project their complex spreadsheet did not take into account tar production and removal from the reactor output gas stream. When I asked the demonstrating engineer about it, he initially said "Tar production would depend on how much is put into the reactor" then I explained that tars were spontaneously produced in a gasifier and he said that they would look into it. So, if one wants to build a successful gasification system, don't use the modeling programs for your design.
Thermogenics is seeking a third party reviewer of out technology for financing sources. The qualifications have to include experience with successful design, construction and operation of a gasification system, and this cannot be a two stage combustor which many tout as a gasifier but isn't. Although there have been project failures such as Range Fuels, my understanding is that the gasifier worked but the catalyst didn't, so someone who worked on the gasifier system may still be eligible.
Thermogenics finds it amusing to watch the industry do the same things over and over again and have repeated brain damage around the world from doing so. We have parties who realize the value of the decades of work to address the problems and are wisely working in licensing the technologies to accelerate the field. The technologies are feeding, ash discharge, gas cooling without using fixed, foulable surfaces or liquid sprays, water treatment, residue neutralization, process control architecture using 2 wires for control and 2 wires for power distribution, overall single layer platform for process control without PLCs, and other process simplifications.
The other global aspect of gasification is that it is one of the fields still able to show good economics in the sinking energy price field, when waste is used, but the financing world is well aware of the muddy tracks left in the field that it is gun shy of getting into it. Any more plasma or pyrolysis technologies get funded and go bust, we all suffer and the field gets farther and farther away from acceptable in the financial world.
Leland T. "Tom" Taylor
From: Mano Va <gmmanovassm at gmail.com>
To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org>
Sent: Thu, Feb 25, 2016 9:20 pm
Subject: Re: [Gasification] Producer Gas issues in a baking oven
Hi srini sir,
1.Tar content based on your gas outlet position and I want to know your gas outlet temperature
2.Above 450 'C its possible to reduce tar but in updraft Pyrolysis gas also mixed in it
3.Duel fuel Oil burners may help to solve this issues
On Thu, Feb 25, 2016 at 8:13 PM, Srinivas Nuti <nuti.srinivas1 at gmail.com> wrote:
We have installed an updraft gasifier of 8 TPD capacity using biomass briquettes for substitution of LPG in a baking oven of temperature of 170 C.
The gasifier is air based atmospheric updraft. The producer gas generated has successfully erected and commissioned.
But we have observed these issues in one out of 3 ovens while the other two are working fine.
We have faced these problems with burner of third oven.
1) It ran for 6 days but later on the producer gas is not able to catch fire at the burner end.
2) Due to lack of flame burner does not start.
3) We have installed tar condenser anticipating tar choke on burner nozzle, but still no positive results.
Your guidance and experience on the same is highly appreciated.
with best regards,
Gasification mailing list
to Send a Message to the list, use the email address
Gasification at bioenergylists.org
to UNSUBSCRIBE or Change your List Settings use the web page
for more Gasifiers, News and Information see our web site:
_______________________________________________ Gasification mailing list to Send a Message to the list, use the email address Gasification at bioenergylists.org to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Gasification