| 摘要 |
<p>PURPOSE:To prevent dioxin from generating by a method wherein an exhaust gas discharged from a scrap melting furnace (electric furnace) is burnt by a high combustion to eliminate carbon monoxide in the exhaust gas. CONSTITUTION:An exhaust gas discharged from a scrap melting furnace (electric furnace) 1 enters a combustion chamber 20 through a sliding pipe 19. Then, the exhaust gas discharged from the combustion chamber 20, e.g. passes through a bucket 25 for scrap preheating under a condition in which a switching valve 23 of a by-pass 22 is opened, and a switching valve 24 of the by-pass 22 is closed, and is introduced to a combustion tower 2 under a condition in which a switching valve 29 is opened. When the operation of the scrap melting furnace 1 starts, the quantity of carbon monoxide increases. However, for a few minutes from the start of power connection of the scrap melting furnace 1, the quantity of carbon monoxide is lower than the explosion limit, and carbon monoxide does not burn. For this reason, the inside of the combustion tower 2 is kept at a high temperature which is 800 deg.C or higher from the start of a power connection of the scrap melting furnace 1 to burn and make the exhaust gas stay for 2 seconds or longer, and thus, dioxin is prevented from generating.</p> |
