Development of Fire Retarding Substances Processing Technology by Using Molten Slag:—Fundamental Research on Combustion Phenomena—

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We have proposed a new processing technology for fire retarding substances kept in the nuclear power plants, etc., which contain low level radioactive wastes. The purpose of this research is to develop a furnace with less combustion air and smaller off-gas system. In this technology, the fire retarding substances are placed on molten slag. The volatile material and fixed carbon are them gasified. Ash at the surface of burning substances melts into the molten slag. This technology is hereafter referred to as the slag fluidized bed process. We compared this new technology to the conventional one. The weight loss of different kinds of substances with different sizes (φ2-5mm) was measured at 1100 deg. C. and in the air. The main results are as follows.<BR>(1) The processing time was greatly dependent on ash contents and the sizes of substances.<BR>(2) In the case of consentional air combustion technology, the processing time of fire retarding substances which had a high ash ratio became longer. This result is due to the surface combustion of fixed carbon. On the other hand, in the case of the slag fluidized bed technology, the processing time was comparatively shorter.<BR>(3) The reason is attributed to the continuous removal of ash along with the molten slag, being followed by the contact of its bare surface with the air.<BR>(4) In this new technology, no evaporation of ash was observed because it was almost all resolved in the molten slag.
一般社団法人廃棄物資源循環学会の論文

Development of Fire Retarding Substances Processing Technology by Using Molten Slag:—Fundamental Research on Combustion Phenomena—

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