[Gasification] low/no nitrogen

[Benjamin Domingo Bof]

Adress of PGSAC
   http://www.angelfire.com/ak5/energy21/woodfire.htm
   for me is the better subject about gassers. Benjamin

Benjamin Domingo Bof <benjaminbof at yahoo.com.ar> escribió:
  GF and Toby, sorry for one comment. My experience in gassers and many readouts is : low moisture fuel obtainig the upmost possible high temperature . then steam is cracked giving ten percent of hydrogen in gas composition. Please read PRODUCER GAS SCIENCE AND CONSTRUCTION of one aussie couple. 
Regards , Benjamin

Toby Seiler escribió:
GF,

Please look at your post and carry the numbers out a little more...I think you'll see why we (I) wish it would work, but believe I see a problem. 

If you have 1 million btu and can extract 250k btu of electric energy and use 10% of that, it makes 25k btu of energy available for the electric apparatus budgeted. That strikes me as a much smaller number than will be required to reform a fuel gas and make syngas from a significant amount of steam. The process doesn't account for making the steam and super-heating it, but the argument of making steam from the 750k btu remaining, maybe consuming 100k btu, appears achievable. 

What remains then are the figures for the volumes of fuel and air for the engine you propose. I'm not sure if you and Dan discussed those numbers and I don't recall what your primary fuel for the engine is. Perhaps you and I are not discussing the same fuels.

In what I have intended, concerning the thermodynamics, the fuel is wood derived gas from a gasification apparatus. Bound and free water contained in wood is either a problem or opportunity but it must be dealt with. You suggest adding steam. I suggest that the steam present is an unavoidable consequence of wet fuel or low temp pyrolysis.

Perhaps you are referring to a diesel fueled engine as a starting point... please enlighten me as to the fuel that you refer to, that feeds the engine prior to recycling certain energies. A diesel fuel would not be reformed and all energy could concentrate on making syngas. 

I believe that you will find the electrical requirement to reform a fuel and make syngas from steam in the volume sufficient for making the 1000k btu of gas energy will require much more input than 25k btu. I suspect that the number to do that is maybe over 5-10 times more. 

There is a trade of electric energy for less maintenance and I think, a better delivery of energy because of flame speed and other factors that improve internal combustion. 

The possibility here, I believe, is that the initial inefficiencies are changed and you can double your recoverable high grade energy. You now have a fuel, because of the reformation process (back to gasifier fuel), that can for example, reach a 50% efficiency and you now get 500k btu of useful work in high grade electric power. Even in this model, I suggest that at least 5-10 times more energy (125k btu to 250k btu) than you think is required (25k btu) will be required for reforming and synthesizing the volume of input fuel for the engine (1000k btu). An advantage appears to me to be taking a problem fuel (tar and moisture laden gas) and making it a much better performing fuel, eleminating or significantly reducing certain maintainance issues. 

Please don't view this as any type of attack on you. I have no reason to be anything but helpful and I encourage you to continue with your good works.

Sincerely, Toby Seiler





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