ABSTRACT
The furnace of a modern high-pressure boiler is the most important part of the steam generator and may well be compared to the heart of the human body. The performance of the furnace affects the performance of each and every surface behind it such as superheater, evaporator, economizer, or air heater. When one talks about boiler furnace, the burner also has to be considered as an integral part of it. If combustion is incomplete or poor, NOx and CO formation may increase, adding to the cost of emission control equipment; CO formation also decreases boiler efciency. Fires are likely in oil-and coal-red boilers if combustion in the furnace is poor. There have been instances when oil burners in the furnace did not operate properly, resulting in oil droplets being carried over by the ue gases and deposited in the economizer or air heater, leading to res or explosions. The discussions that follow pertain to package steam generators ring oil or gaseous fuels with a capacity ranging from 15 to 250 t/h of steam.
