Heating furnace issues

"What do \"few burners\" and \"many burners\" in a heating furnace mean? Also, when burning gas, what color should the flame be? The air inlet is regulated by the damper, and the same goes for the flue dampers – what are the differences? Please advise: In 3 n’ U: c’ H6 G, the terms \"more burners\" and \"fewer burners\" refer to the number of burners that are lit. The general requirement is to have \"as many burners as possible, short flames, low back pressure, and even distribution\"; that is, as many burners should be used as feasible while still meeting the temperature control requirements, in order to achieve short flames and even distribution ； The flame from burning gas should be light blue; if it is yellow, it indicates an excess of oxygen, and the amount of air supplied should be reduced. If there is black smoke or secondary combustion, it means there is a lack of oxygen, and the amount of air supplied should be increased ； The air damper is used to regulate the amount of air intake, while the flue damper is used to control the pressure in the furnace. When the opening degree of the air damper is fixed, adjusting the opening degree of the flue damper can also affect the air intake to a certain extent; however, the flue damper is generally not used to regulate the air intake.