OCR Text |
Show Unit: % ® Fuel combustion © Combustionair (D Material treated © Total(kcal/h) ® Combustion gas ©Slag production ® Heat loss of furnace, etc. Bottom ash 88 11 1 661,000 65 11 24 Bottom ash mixed 38% Flv ash 88 11 1 926,000 61 10 29 (D Material treated Combustionair © Fuel combustion Figure 6 Heat Balance Melting furnace ® Heat loss of furnace,etc. ®Slag Combutiongas 4. Incineration A sh The ash used in the existing furnace and the test furnace consisted of the bottom ash and the fly ash from an incinerator equipped with stokers. A s shown on table 3, the main components were SiOz, A103 and CaO. The basicity was 0.3, and the softening point, melting point and flowing point were 1,150 *C, 1,170 *C and 1,200 °C, respectively. The fly ash contained the same three main ingredients, but had more C a O and less SiOz. This was because of the slaked lime injected into the gas stream at the treatment unit of the incineration plant. Therefore, the basicity was highat 2.4, and softening, melting and flowingpoints were all above 1,400 °C, revealing its high-temperature melting points. The bottom ash had its clinker crushed by the crusher, and shifted througha 3 0 m m mesh screen, and the metals were removed by the magnetic separator. These processes increase the ash surface increasing heat-conveying surface area, stabilize the equiUbriumslope and assist successful melting. 10 |