Method of waste melting treatment

Abstract

A waste-melting method, in which waste is fed into a waste-melting furnace ( 1 ), and the waste is thermally decomposed and combusted, and then, thermal decomposition and combustion residues are melted, is characterized in that coal coke and a biomass-molded material obtained by press-molding a biomass starting material while heating the biomass starting material to a temperature lower than the carbonization temperature thereof are fed into the melting furnace, a high-temperature grate is formed with coal coke at the bottom of the melting furnace, and the coal coke and the biomass-molded material are combusted and used as heat sources for melting.

1 - 5 . (canceled) 
     
     
         6 . A method of waste melting treatment performed by charging waste into a waste melting furnace, thermally decomposing and burning the waste, and melting a pyrolysis combustion residue to produce a melt, comprising:
 the biomass molding step of providing a biomass molded article containing volatile components by 50 weight percent or more and having a property suppressing pyrolysis and combustion of the volatile components until the biomass molded article reaching a lower section of the waste melting furnace after having been charged into the waste melting furnace,   the high temperature fire grate forming step of forming a high temperature fire grate with coal coke in the lower section of the melting furnace by charging the coal coke into the waste melting furnace at a minimum supply quantity required for forming a high temperature fire grate securing combustion gas rising and passing through the high temperature fire grate and the melt falling and passing therethrough with voids created between lumps of coke,   the biomass molded articles falling step of, after the biomass molded article provided in the biomass molding step having been charged into the waste melting furnace, causing the biomass molded article to fall and reach the high temperature fire grate while suppressing pyrolysis and combustion of the volatile components of the biomass molded article, and   the pyrolysis combustion residue melting step of melting the pyrolysis combustion residue, using the heat generated by burning the coal coke, and the volatile components and fixed carbon of the biomass molded article with the high temperature fire grate.   
     
     
         7 . The method of waste melting treatment according to  claim 6 , wherein the biomass molding step performs heating a biomass raw material at a temperature of 115 to 230° C. while pressure molding it. 
     
     
         8 . The method of waste melting treatment according to any one of  claims 6  or  7 , wherein the biomass molding step provides a biomass molded article as a prismatic body one side of which has a length of 50 mm or longer, or a cylindrical body having a diameter of 50 mm or larger and a length of 50 mm or longer.