"Carbon footprints of various sources of heat – biomass combustion and CHPDH comes out lowest " – William Orchard.
The analysis indicates that burning biomass in large scale CHP has significant benefits compared to Anaerobic digestion of biomass and then burning the gas in CHP or in boilers.
The table follows the convention of treating the growing of biomass and the CO2 it absorbs as one process and then the use of biomass as a second process.
Wood used in a building where it may be stored for hundreds of years will reduce global CO2 whereas burning the wood merely stabilises CO2.
Growing biomass and then burning it can not reduce global CO2.
Using the current waste heat from today’s power generation to heat buildings will however displace other fuel and thus reduce global warming.
Given my logic is sound the use of waste heat from electricity generation should be given greater incentives by government than burning biomass.
I am not an expert on the different routes to biofuels but those that are will no doubt comment.
William Orchard – Orchard Partners