[Gasification] A formula for calculation of steam as fluidized media for BFB gasifier

[L. He]

Hi Farokh,
 
i think it's somehow similar to the calculation of equivalence ratio (ER), in which the gas products of complete combustion are assumed to be only CO2 and H2O. 
 
In the case of steam gasification, the gas products of 'complete gasification' are assumed to be H2 and CO. The proximate and ultimate analysis of biomass provide the formula of biomass in the form of CxHyOz. By balancing CxHyOz + H2O -- CO + H2, you will find out the theorectical amount of H2O necessary for the steam gasification. For normal wood (with H2O wt.% < 10%) , it's around 0.27 while for Jatropha 0.6. In practical application, excess amount of steam will be supplied to the system due to the low reaction rate and therefore incomplete conversion. That's why the range of 0.2 to 1 is pretty often used in the experiments. When calculating the steam input, the water content in the fuel itself should be considered, which means less steam is needed for wet fuel. 
 
Best Regards,
Ling He
 


From: farokh156 at gmail.com
Date: Thu, 2 Dec 2010 21:33:53 +0100
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] A formula for calculation of steam as fluidized media for BFB gasifier


Yes, I we have the experimental ratio in range of 0.2 to 1 ton steam per ton of biomass. I need a scientific reason for that.

Best Regards,
Farokh Sahraei
Cell: (+46 700 2392 11)





On Thu, Dec 2, 2010 at 17:36, L. He <sunyears at hotmail.com> wrote:


Hi Farokh,

do you mean the steam to biomass ratio (S/B)? 

Best Regards,
Ling He



From: farokh156 at gmail.com
Date: Tue, 30 Nov 2010 23:29:50 +0100
To: Gasification at bioenergylists.org
Subject: [Gasification] A formula for calculation of steam as fluidized media for BFB gasifier





Hi everyone,

Does anybody know any formula for calculation of steam as fluidized media for bubbling fluidized bed (BFB) gasifier for biomass gasification using steam?
Also correlation between the steam and feed rate for feedstock or bed material?

Thanks in advance


Best Regards,
Farokh Sahraei
Cell: (+46 700 2392 11)



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