The Heartbeat of Wood, Again - The Challenge of Wood Biomass Boiler Technology (June 2004)
In 2004, Japan was working to expand the use of renewable resources in accordance with the "Basic Law for Establishing a Recycling-based Society" (enacted in 2000) and the "Biomass Nippon Comprehensive Strategy" (formulated in 2002). In this context, a woody biomass boiler that uses unused wood that was originally discarded, such as construction waste and thinned wood, as fuel was being demonstrated.
This technology was designed to promote the use of domestic timber, which had been neglected due to inadequate forest maintenance and falling timber prices, and to reuse the large amount of construction waste that lay dormant in the suburbs of cities as a heat resource. One of the issues at the time was the establishment of control technology to reduce emissions such as dioxin and particulate matter while improving combustion efficiency. For example, in Iwate Prefecture, "development of a compact and inexpensive chip boiler that can handle high moisture content wood chips" is underway.
In cold regions such as Hokkaido and Nagano Prefecture, introduction experiments are underway for schools and hot spring facilities, and cost comparisons with heavy oil boilers and verification of CO₂ reduction effects were also conducted. For example, data showing a "220 t-CO₂ reduction per year through the use of fuel production and chip boilers" has been reported.
Technically, the combustion principle of woody biomass boilers emphasized a system that "reduces the moisture content of the biomass fuel and generates combustible gas from the pyrolysis stage for combustion.
This technological advancement was significant from the perspective of "local production for local consumption of energy" and "mountain village development," and was highly regarded as a response from the field to the national challenge at the time of linking environmental technology and local economies.
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