I need few clarifications
1) how does low HHV of feed stock is converted into high HHV of bio-crude?
2) Is HHV of biomass, yield and HHV of bio-crude are dependent on each other?
The HHV of biocrude (and biomass) depends largely on (a) the moisture content, and (b) the oxygen content. Therefore, biocrude HHV increases as the process that generates it minimizes these two things. The first is minimized by using dry feedstock and the first and second by optimizing (usually minimizing) the oxygen exposed to the biomass during conversion to biocrude.
sir,thanks for your answer but I'm working in HTL which is a wet processing of biomass where i cannot dry the biomass. will HHV of biomass influence yield percentage or biocrude HHV?
Generally the more water you add with the fuel the lower the HHV of the product will be unless you have a way to separate the biocrude from water (which is not easily done). The effect of water on yield is more complex and depends on the details of your system. In term of mass yield, it will generally increase it because water usually mixes with the organic oils in ways that are difficult to separate. Energy yield is more complicated. If can decrease the processing temperature to the point that liquid yield suffers or, if operating temperatures are very high, it can promote the formation of light gases. In nearly all cases it will soak up energy that should have gone into biocrude formation and require either more energy input or it will decrease yield.
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