Study of Heat Supply System Employing Driftwood and Timber Biomass

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  • 流木を利活用した地域熱供給システムの検討
  • リュウボク オ リ カツヨウ シタ チイキ ネツ キョウキュウ システム ノ ケントウ

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Abstract

 We consider a heat supply system that employs felled timber and driftwood, which accumulate at nearby dam, as a source of wood fuel. Because it is known that the calorific value of driftwood differs from that of conventional firewood, drying and burning experiments were conducted, to determine the exact value. Variations in the output of the currently operating boilers were measured at one-minute intervals, and the proper output for the wood fuel boiler that should be attained was calculated. Two types of boilers—firewood and chip—were used for this study. Construction, operation, and fuel expenses were calculated by considering nine scenarios, including a case in which a boiler is installed in each hotel and a case of district heat supply, to determine the most cost effective scenario. To eliminate any bias, unit costs were derived from various sources, such as case studies, and catalog representative values (approximation / mean). From this, the case in which a chip boiler is installed in each hotel was found to be least expensive. The study also revealed that hotels could recover the initial cost of installing these boilers in four years, which would be more economical compared to the case in which they continued to use heavy oil boilers.

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