| 摘要 |
PURPOSE:To prohibit hydrogen sulfuride from being generated during combustion by a method wherein a concentration of hydrogen sulfuride in combustion gas near the extremity end of flame or each of burners or each of groups of burners in a furnace is detected and a flow rate of air in each of the burners or each of groups of burners is adjusted by this sensed value. CONSTITUTION:Combustion gas is collected by combustion gas collecting pipes 19, 19' and 19'' arranged near extremity ends of flames of each of grouts of burners 3, 3' and 3'' and a concentration of hydrogen sulfuride in combustion gas can be detected by an analyzer. As fuel, heavy oil having sulfur of more than 1 wt%, remaining carbon of more than 7 wt% and a kinematic viscosity of 100 cSt or more at 50 deg.C is used, a concentration of hydrogen sulfuride in combustion gas near extremity ends of flames in each of groups of burners during combustion is detected and a flow rate of combustion air is adjusted by a degree of opening of a damper 14 arranged in an air duct 13 of each of burners or groups of burners in such a way as the concentration becomes 20 volumetric ppm or less. Operation is carried out while keeping an air fuel ratio of each of the groups of burners within a desired range and then hydrogen sulfuride is prohibited from being generated during combustion. |
