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1. What is an oil-gas combined burner? An oil-gas combined burner is one that can burn both fuel oil and fuel gas ； There are units that can run on oil alone or on gas alone, as well as those that can use both oil and gas simultaneously. 2. What is an igniter? The igniter is a small nozzle used to light the main burner. 3. What is a nebulizer? A nebulizer is a component used to atomize liquids. Atomization is usually carried out using steam, air, or mechanical methods. 4. What is a bellows? A bellows refers to a chamber that surrounds the burner, used to distribute air into the burner and reduce combustion noise. 5. What is a soot blower? A soot blower is a device that uses injected steam or air to clean the dust from the surface of furnace tubes. 6. What is a plug-type elbow? Plug-type elbow is usually a cast elbow. Such elbow fittings are equipped with one or more openings to allow for inspection through these holes, or to remove coke from within the furnace tubes by mechanical means or to empty them. Depending on the operating conditions, sealing requirements, and capacity, different sealing structures can be used for this elbow. 7. What is a elbow box? A elbow box is a container with an insulating layer on its interior that separates it from the flue gas, and is used to enclose a certain number of elbows or collector pipes. The cabinet is equipped with a hinged or removable door cover for opening it for operation. 8. What is a coil? The coil refers to all the pipes that connect the radiation chamber and the convection chamber using sharp bends or elbows. 9. What is a collecting duct? A manifold is a pipe used to collect fluid coming from a tube or to distribute the fluid into multiple parallel tube runs. 10. What is a shielding tube? A shielding tube refers to the part of the tube in the convection chamber that prevents it from receiving direct radiation.