Hi Shivanand, You are right to raise these points.
>[email protected] wrote: > One major issue in using engine cooling air for drying would be the > power requirement. Typically, the engine cooling fan consumed about > 5% of BHP ( BHP, not net power). Assuming similar pressure drop for >the dryer system, another 5% of BHP towards power consumption of dryer >would be too high a parasitic load. This would be true if the biomass being dried was high resistance,but not all driers need the extra fan. Unless the engine generator is being used for base load, many generators are operating on demand. Listers recommend that in this situation, the engine operates at about 70% of it's rated electrical load, leaving 30% to pick up start-up peaks to prevent a drop in frequency. It's a small price to pay using unused power for adding what could be a second $$$ making activity drying "stuff" in any rural community. > Typically the cooling air would be @ 50-55 Deg C ( amx in Indian > conditions). This temperature would be sufficient to dry out the > surface moisture. For drying beyond the surface, a higher temperature > differential would be required to drive the heat transfer at a > reasonable rate so as to make the residence times reasonable. While this is true, in practice drying wood blocks in these types of driers has been very successful allowing more to be dried than consumed by the gasifier. Important to watch those parasitic ancillary loads however. You might like to check out the Wood chip Bunkers on the Fluidyne Archive http://www.fluidynenz.250x.com/ The CHP engines were fitted with water heat exchangers, allowing hot air drawn from the engine radiator and gasifier room, to be blown over the heating radiators feeding the drying floors. Lots of waste heat if you can catch it all (:-) Doug Williams, Fluidyne. _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
