BURNER - a gas burner, widely used in scientific...

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a gas burner, widely used in scientific laboratories, consisting of a metal tube with an adjustable air valve at the base -------- The Bunsen burner is the object most frequently associated with a chemistry laboratory. In this lab, it will serve as the primary heat source. The burner operates on natural gas, much like the burners of a gas stove. ------------------ All combustion requires three components: fuel, heat, and oxidant. There are several types of laboratory burners. All types have some means to mix the fuel and oxidant. Many have a valve to regulate the amount of fuel that enters the burner. Starting the burner requires a source of heat, usually a spark from a striker or a match flame. Tirrill burners have a barrel with air intake openings that are regulated by screwing the barrel up and down on the base. They also include a needle valve near the base of the burner to regulate the gas flow. Some Tirrill burners have a collar at the top of the barrel to help increase the fuel oxidant mixing if natural gas is used instead of propane. The gas intake tube has a small hole called a spud that increases the speed of the fuel as it exits into the barrel of the burner. Look at the burner diagram to identify these parts of your Tirrill burner. Lean fuel mixtures (less fuel and more oxidant) burn hotter than rich fuel mixtures (more fuel and less oxidant). Rich fuel mixtures are easier to ignite. Once a Tirrill burner has been optimally adjusted for proper flame height, it is much easier to leave the fuel valve adjustment alone and adjust only the air intake openings to achieve a rich mixture for easy lighting. Use the following procedure to light your burner. Screw the barrel down to reduce the size of the air intake openings. Attach the burner to the fuel source with a rubber tube. Hold a striker just above and to the side of
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This note was uploaded on 02/02/2012 for the course CHEM 211 taught by Professor Santos,j during the Spring '11 term at Abu Dhabi University.

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BURNER - a gas burner, widely used in scientific...

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