| 摘要 |
PURPOSE:To avoid a decrease in the concn. of CO2 in an exhaust gas and to obtain CO2 having fixed compsn., by releasing the exhaust gas of a hot-blast stove decreased in the concn. of CO2, in the air without introducing to a stack pipe, when air blast and combustion in the hot-blast stove are switched. CONSTITUTION:When the combustion is switched over to the air blast in the air-blast stove HS-1, stack valves V1 and V2 are opened and other valves are shutted, and when the combustion process is finished the supply of combustion gas and air for combustion is stopped. And then, the valves V1 and V2 are shutted and the pressure of other air-blast stoves having atmospheric pressure at the time is increased to e.g., 2K, by opening blasting valve V4 and by letting flow from the air-blast stove HS-1 to other air-blast stove through a equalizing pipe 6. Then, by shutting the valve V4 and opening the valve V5, the pressure of other air-blast stove is increased to e.g., 4K and hot air blast 2 to a blast furnace is started. By this way, in switching between air blast and combustion in the hot-blast stove HS-1, the concn. of the product CO2 is kept constant without introducing the exhaust gas decreased in the concn. of CO2 to the stack pipe 5. |
