Technology
Japan’s first
system to produce biomass fuel from dehydrate sludge with the help of the
low-temperature carbonization technology has been completed. Three companies of
J-Power, Tsukishima Kikai, and Metawater jointly constructed system in
Hiroshima city. The constituent includes sludge dryer, carbonizing furnace, and
granulator. The system will start operation soon in April. A total cost
including the construction cost and the 20-year operating cost is about 9,300
million yen.
The system has a
capacity to treat 4,500 tons of sludge annually, 46% of total sludges generated
in Hiroshima city in a year. With the completion of the system, the city will
reduce carbon dioxide emissions 8,700 tons annually. In addition, decreased fossil
fuel consumption will reduce carbon dioxide emissions 6,400 tons annually,
making the total reduction of carbon dioxide emissions 15,100 tons annually.
The system decreases the carbonization temperature to 250-300 degrees
centigrade that is from half to one-third of the temperature of the conventional carbonization
technology. The low carbonization temperature enables carbide to realize high
calorific value, increasing the value of the generated biomass fuel.
Granulation in the pre-carbonization stage makes the spontaneous combustibility
low. The fuel to be produced will be sold and mixed with coal fuel.
A biomass production plant
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