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Home > Forums > Engineering Forums by Industry > Energy Engineering > Heat: Combustion engineering Forum

Heating Value of BiogasHelpful Member! 

thread610-285405
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magaguadavic (Bioengineer)
9 Nov 10 12:38
Can someone tell me how to claculate the heating value of biogas given the following: 55% methane, 750 mbar, 47 degrees C, gas is saturated? Been using the lower heating value at STP but we're off setting more fuel oil than expected. Assume it is because gas is not at STP. Any help would be greatly appreciated.
25362 (Chemical)
10 Nov 10 2:02

Following danw2's given link, it seems that LHV drops by about 19% at the conditions submitted by magaguadavic. For that message danw2 merits a star.  
magaguadavic (Bioengineer)
10 Nov 10 7:07
25362, I don't get the same. Using danw2's link and especially Figure 2, I get an increase in LHV due to the increase in P and T above STP. Am I missing something?
25362 (Chemical)
10 Nov 10 9:40

Magaguadavic, I based myself on Table 1. The LHV values are tabulated at a given STP, which adjusted to the prevailing conditions you mentioned, means that every CF of gas has a lower heat value.
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