[Digestion] Biogas appliances

[Vianney Tumwesige]

Dear All,

I am writing a paper on biogas appliances, below is an extract from the
paper.

All gas burners follow the same principle; the force which drives the gas
and air into the burner is the pressure of gas in the pipeline. A biogas
stove can have single or double burner with varying gas consumption rates
ranging from 220 dm3 hr-1 to 450 dm3 hr-1 at standard temperature and
pressure. This consumption rate results from the pressure provided by the
biogas plant and the diameter of the inlet pipe. The jet at the inlet of
the burner increases the gas speed, so producing a draft that sucks primary
air into the pipe. The primary air must be completely mixed with the
biogas, and this is achieved by widening the pipe to a minimum diameter,
which is in constant relation [JUS1] <#_msocom_1> to the diameter of the
jet. The widening of the pipe again reduces the speed of the gas. This
diffuse gas goes into the burner head. The burner head is formed in such a
way as to allow equal gas pressure everywhere before the gas/air mixture
leaves the burner through the orifices at a speed only slightly above 0.25
ms-1, the specific flame speed of biogas. More oxygen (secondary air) is
supplied by the surrounding air to enable final combustion.
------------------------------

 [JUS1] <#_msoanchor_1>Specify what this constant relationship is plus
reference
 Please, is some one in position to provide more information on the
highlighted section of the extract?

Thank you in advance,

Regards
-- 
Vianney Tumwesige
Director - Green Heat (U) Ltd  [image: Picture]
P.O. Box 10235
Kampala-Uganda
256 (0) 71 237 9889

"The more people are self sufficient in cooking fuel, the more personal and
financial freedom they have." - Emma Casson


 <http://trustvianney.wordpress.com/>
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