ABSTRACT
Natural-draft burners are used in a wide range of residential and commercial applications, including gas-fired furnaces, water heaters, cooking ranges, and ovens. However, these burners are somewhat unique in industry. Most burners used in industrial combustion applications are forced or mechanical draft, where the combustion air is supplied to the burner with a fan or blower. In natural-draft burners, the combustion air is induced or drawn into the burner via the suction created by the
incoming fuel jets and via the buoyancy forces inside the furnace that create an updraft. These burners are predominantly used in the chemical process industry (CPI) and the hydrocarbon process industry (HPI). They are fired in a variety of configurations on a variety of fuel compositions that are mostly gaseous, but are sometimes liquid. There are many unique aspects of natural-draft burners, compared to forced-draft burners, discussed in this chapter.
