Hello
Dear ALL,
How carbon content (from CHNS of sample), Volatile matter (from Proximate analysis) and HHV of biomass benefits to gasification?
Regards
Dear Abdul,
that depends on the gasification process. For example, if you use autothermal gasification, part of the chemical energy of the biomass is used for the endothermal reactions, thus producing hydrogen and carbon monoxide. So, if you have only a low HHV, it will usually result also in lower HHV of the product gas. Also, the ratio of carbon monoxide and hydrogen will depend on CHNS, but also on gasification agent and process conditions. Higher carbon content might usually result in higher carbon monoxide share of the product gas.
You can do chemical and thermodynamic calculations with software, so you can learn about this.
Best regards
Andreas
Dear Andreas,
Which software do you use for thermodynamic calculation of gasification process?
I think we have to maintain heating value of the feed in some ratio from 15 to 30 MJ/kg. It will give you the best syngas. more CO and H2 and less CO2 and N2
Dear Nauman,
we usually use Matlab, Aspen or comparable software for calculation. Within the gas phase, it should be possible to use Cantera.
Concerning the heating value, I do agree, but of course you have to use what you get... most biomasses will be much below 30 MJ/kg.
Best regards
Andreas
Frankly, the HHV basically tell me how much fuel i will have to use to achieve a particular power output from my motor. As to how it will perform in the gasifier, the amount of moisture in the wood has a far bigger influence on what the product gas will look like. Too little moisture and the hydrogen concentration declines. High moisture and you affect the max temperature achieved in the hearth (I am talking downdraft air gasification here). The design of the gasifier is also a big influence on the syngas qualtiy/composition. Preheating both the air and the wood prior to it reaching the combustion zone allows hotter combustion temperatures or more realistically, allows the use of higher moisture biomass. I would suggest that using wood with a HHV of
With regards to the question asked, I think the essence of the determination of these quantity : carbon, Volatile matter and HHV in biomass gasification, is to pre-quantify the amount of obtainable carbon monoxide and hydrogen depending on gasification agent and process conditions.The determination of these quantity help in the determination of optimal composition for optimal yield. More so that , a higher carbon content might usually result in higher carbon monoxide ratio of the product gas. Most research may be bias if this quantity are not taken and argued for in gasification presentations
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