| 摘要 |
PURPOSE:To burn CO gas with minimum possible amount of air within a range free from explosion of the CO gas by controlling the amount of cool air flowing in according to deviation in comparison with the preset concentration of CO gas detected in a gas from a combustion column. CONSTITUTION:The concentration of CO gas is preset for a CO gas concentration indicator/adjusting meter 15 in a range of allowing no explosion beforehand. If the amount of air flowing in from a cool air inflow duct 13 is small, CO gas generated from an arc furnace 1 remains in a combustion column 5. This CO is detected with a detector 14 and compared with the preset, concentration of CO gas in the CO gas concentration indicator/adjusting meter 15 and a cool air flow control valve 12 is opened according to the deviation signal. When the amount of air flowing in from a cool air inflow duct 13 is too much, the cool air flow control valve 12 is reduced according to a detection value of a CO gas detector 14. This enables the combustion of CO gas with minimum possible amount of air within a range free from the explosion of the CO gas. |
