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In a water boiler, draft is the difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage. [1] Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.
Types of draught can also be divided into induced draught, where exhaust gases are pulled out of the boiler; forced draught, where fresh air is pushed into the boiler; and balanced draught, where both effects are employed. Natural draught through the use of a chimney is a type of induced draught; mechanical draught can be induced, forced or ...
Most boilers now depend on mechanical draft equipment rather than natural draught. This is because natural draught is subject to outside air conditions and temperature of flue gases leaving the furnace, as well as chimney height. All these factors make effective draught hard to attain and therefore make mechanical draught equipment much more ...
When early marine boilers were fed with salt water, they would be blown-down several times an hour. Blow-down cock A valve mounted low-down on the boiler, often around the foundation ring, which is used for blow down. Blower The blower provides a forced draught on the fire, encouraging combustion.
Forced draught is provided in the locomotive boiler by injecting exhausted steam back into the exhaust via a blast pipe in the smokebox. Locomotive-type boilers are also used in traction engines, steam rollers, portable engines and some other steam road vehicles. The inherent strength of the boiler means it is used as the basis for the vehicle ...
This system dramatically reduced the amount of coal used in ships' boilers. Howden patented this device in 1882 as the 'Howden System of Forced Draught' [8] and during the 1880s more than 1000 boilers were converted to this specification or constructed to Howden's patent. [12] The first vessel to use the system was the New York City, built in ...
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Draft (boiler), difference between atmospheric pressure and the boiler pressure; Chimney draught, outgoing flow into chimney of gases from combustion; Draught excluder, used to eliminate cold draught and slow heat loss; Mechanical draft, incoming flow of air to burn fuel for a boiler or engine; Vertical draft, vertical movement of air, which ...
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