| 摘要 |
According to the present invention, it is possible to prevent a difference in temperature among the fields of temperature inside the reaction furnace from becoming so large as to cause cracks of the reaction pipes or coking at the start of combustion. It is also possible to prevent a difference in temperature among the fields of temperature in the combustion chamber from becoming so large as to cause cracks of the reaction pipes or coking by reducing the combustion amount of the first burners with an increase in combustion of the one or more second burners after a high temperature air combustion state is attained in the combustion chamber of the reaction furnace. <IMAGE> |
