[USCC] Re: Compost as fuel
CAVM at aol.com
CAVM at aol.com
Wed Feb 9 19:28:20 CST 2005
Jerry Foster, the problems with combustion of poultry litter are basically 3.
1. Litter clumps and smolders without a good under fired combustion unit,
densification or a bulking agent. Any or all of these will help significantly.
2. At high combustion temperatures slagging occurs.
3. Acid released during combustion will eventually degrade the combustion
chamber and heat exchangers.
Certainly the minerals will not be consumed in the combustion unit.
However, the handling issues are greatly reduced. Perhaps this group can assist in
value added processing for the ash.
Heating poultry houses with biomass involves significant capital in
equipment. Either multiple biomass units are required or insulated transmission
lines to carry hot water to each house must be laid. The district heating model
of a single large combustion unit and multiple buried lines to transmit the
hot water seems the most economical and least trouble.
Other issues are to be considered such as the method of transmission. We
advocate hot water radiators of various kinds depending on the house
construction. Dr. Mike Brown of Arab, Alabama recommends hot air systems. In either
case the birds are considerably more healthy, the litter drier, odor and flies
greatly reduced and significant money is saved by the farmer. Automatic
feeding and ash cleaning features, heat exchangers and other issues must be
addressed in the design of a combustion system.
I am coming to the idea that composted poultry litter may be somewhat better
as a fuel then dried straight litter. Odor issues in the stockpiled fuel as
well as volumes of litter are reduced. I think it may handle better
composted as well.
Missouri has other farm issues, including not having rendering plants for
farm mortalities. As has been said here, composting mortalities on the farm
may now provide a new source of biomass fuel for your farmers. These are very
exciting issues to be discussing.
Neal Van Milligen
_cavm at aol.com_ (mailto:cavm at aol.com)
From: "Jerry Foster" _jerry.foster at dnr.mo.gov_
(mailto:jerry.foster at dnr.mo.gov)
Do you have a idea, or better yet a plan for dealing with the ash?
Missouri has a project going to look at using poultry litter to as fuel
for force air furnaces used to heat the same barns the litter came from.
We're seeing air quality improvements in the barns and reduced volume of
litter to handle. But for the most part, we have the same amount of
phosphorus in the ash as we had when we started with the litter. We
haven't found anyone willing to utilize the ash.
More information about the Compost