| 摘要 |
<p>PURPOSE:To inexpensively obtain a good burned article in high yield at the time of laminating a fly ash granulated material on the moving grate of a kiln and passing the material successively through the drying and preheating zone, burning zone, cooling zone, etc., to continuously burn the material by controlling the oxygen amt., temp., etc., necessary for the combustion reaction in the burning zone. CONSTITUTION:A fly ash granulated material 1 is laminated on the moving grate 4 of the kiln isolated from the atmosphere, passed successively through the drying and preheating zone 6, igniting zone 7, burning zones 9 and 10, cooling zone 11, etc., and treated with the gas current circulating from the upper part to lower part. A part of the combustion gas in the burning zones 9 and 10 is mixed with combustion air, the oxygen concn., gas flow rate at the inlet of the burning zones and gas temp. are adjusted, and the combustion gas is circulated to the burning zones 9 and 10 to burn the material. Air is supplied to the cooling zone 11 to cool the burned material, and the waste cooling gas is circulated to the drying and preheating zone 6. The excess gas unnecessary for the circulation in the burning zone combustion gas and the outlet gases from the drying and preheating zone and igniting zone are discharged outside the system. Consequently, the amt. of oxygen necessary for the combustion reaction in the burning zones 9 and 10, circulating gas amt. and temp. are controlled, and the material is continuously calcined.</p> |
