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Show 1 . 3 The necessity to develop ash-melting furnace It is a common practice to incinerate refuse in order to reduce its volumeand detoxify it. The ash residue must be landnlled, and due to the shortage of landfill sites, reuse of residue after it is melted and solidified, is required. This calls for development of ash-melting furnace. Here, I will explain the history and current status of surface-melt furnace using fuels. 2 . History Table 2 shows the installation record of Takuma's surface-melt furnaces Table 2 Takuma's Reflecting Surface-Melt Furnace No. 1 2 3 4 5 6 7 N a m e of plant Kashima,Ibaragi Prefecture Saitama East No.2 Saitama East No.l AnanCity Sakado, Saitama Pref. Sayama City No.2 TouganeCity Unit X Capacity (Ton/Dav) 1 x 6.5 2 X 14.4 2 X 15.0 2 X 4.8 1 x 9.6 1 x 7.0 1 x 26.0 Year 1981 1985 1986 1991 1994 1996 1998 2 .1 Kashima intermittent operation furnace Design work for this surface-melt furnace began in 1977, and a test furnace was built in our testing center where tests were conducted. Working furnace No.l was installed at Kashima in 1981. This unit was designed to melt both the bottom ash and the fly ash into slag, and it was for intermittent operation. The iron content of the ash was as high as 15.5% and the molten metal accumulated at the tip of slag tapping hole, blocking the flow. Also, the monolithic refractories on the side wall and ceiling fell down. 2 . 2 Saitama-East No.2 Incinerator in-line continuous operation furnace This furnace was installed in-line with the incinerator so that the residual heat of the bottom ash can be utilized for melting without heat loss. However, the input of ash was irregular, and the clinker which grew in the furnace was transferred to the melting furnace. Also, the metal content(11.5%) was not removed, causing accumulation at the slag tap, 3 |
