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Early boilers provided this stream of air, or draughtthrough the natural action of convection in a chimney connected to the exhaust of the combustion chamber. One consideration is the introduction of feedwater to the boiler.

Association of Water Technologies: Collapsed or dislodged boiler tubes can also spray scalding-hot steam and smoke out of the air intake and firing chute, injuring the firemen who load the coal into the fire chamber.

Electric steam boilers use resistance- or immersion-type heating elements. The pressure vessel of a boiler is usually made of steel or alloy steelor historically of wrought iron. Others are convection type, absorbing heat from a fluid. Historically, copper was often used for fireboxes particularly for steam locomotivesbecause of its better formability and higher thermal conductivity; however, in more recent times, the high price of copper often makes this an uneconomic choice and cheaper substitutes such as steel are used instead.

Superheater operation is similar to that of the coils on an air conditioning unit, although for a different purpose.

The first is through use of a steam jet. Some are a combination of the two types. Cast iron may be used boilee the heating vessel of domestic water heaters.


As the resulting ” dry steam ” is much hotter than needed to stay in the vaporous state it will not contain any significant unevaporated water. The design of any superheated steam plant presents several engineering challenges due to the high working temperatures and pressures.

AQC & SP Boilers

Boilers Chemical equipment Plumbing Heating, ventilating, and air conditioning. To define and secure boilers safely, some professional specialized organizations such as the American Society of Mechanical Engineers ASME develop standards and regulation codes. From Wikipedia, the free encyclopedia. There are two types of mechanical induced draught. Air is often passed through an air heater; which, as the name suggests, heats the air going into the furnace in order to increase the overall efficiency of the boiler.

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Since the heated flue gas is less dense than the ambient air surrounding the boiler, the flue gas rises in the chimney, pulling denser, fresh air into the combustion chamber. Saturated steam is useful for many purposes, such as cookingheating and sanitationbut is not desirable when steam is expected to convey energy to machinery, such as a ship’s propulsion system or the “motion” of a steam locomotive. Special methods of coupling steam pipes together are used to prevent leaks, with very high pressure voiler employing welded joints to avoided leakage problems with threaded or gasketed connections.


All these factors make proper draught hard to attain and therefore make mechanical draught equipment much more reliable and economical. Types of draught can also be divided into induced draughtwhere exhaust gases are pulled out of the boiler; forced draughtwhere fresh air is pushed into the boiler; and balanced draughtwhere both biler are employed.


Forced draught furnaces usually have a positive pressure. American Society of Mechanical Engineers: Another consideration is safety.

For instance, the ASME Boiler and Pressure Vessel Code is a standard providing a wide range of rules and directives to ensure compliance of the boilers and other pressure vessels with safety, security and design standards. Where a large volume of hot gas is available from some process, a heat recovery steam generator or recovery boiler can use the heat to produce steam, with little or no extra fuel consumed; such a configuration is common in a combined cycle power plant where a gas turbine and a steam boiler are used.

Technology-Nanjing Triumph Kaineng Environment & Energy Co., Ltd.

Balanced draught is obtained through use of both induced and forced draught. Dampers are used to control the quantity of air admitted to the furnace.

A boiler is a closed vessel in which fluid generally water is heated. Retrieved 25 March By using this site, you agree to the Terms of Use and Privacy Policy.

Frost and Boile R. The steam piping is directed through the flue gas path in the boiler furnace, an area in which the temperature is typically between 1, and 1, degrees Celsius 2, and 2, degrees Fahrenheit.

Natural draught through the use of a chimney is a type of induced draught; mechanical draught can be induced, forced or balanced. To measure the boiler efficiency in indirect method, we need a following parameter like:.