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As the fluid expands through the turbine stages, its thermodynamic state drops below the critical point as it does work turning the turbine which turns the electrical generator from which power is ultimately extracted.

Because of this, steam is a great way of moving energy and heat around a site from a central boiler house to where it is needed, but without the right boiler feed water treatment, a steam-raising plant will suffer from scale formation and corrosion.

AQC & SP Boilers

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. Tube tool Boiler feed water deaerator Dealkalization of water Electric water boiler for drinking water Heat-only boiler station Hot water reset Internally rifled boiler tubes also known as Serve tubes Lancashire boiler List of boiler types Outdoor wood-fired boiler Natural circulation boiler.

Heat recovery steam generators HRSGs use the heat rejected from other processes such as gas turbine. There are two types of mechanical induced draught. The fluid does not necessarily boil. Forced draught furnaces usually have a positive pressure.

The brittleness of cast iron makes it impractical for high-pressure steam boilers. Retrieved 25 March Superheater operation is similar to that of the coils on an air conditioning unit, although for a different purpose. In a nuclear power plant, boilers called steam generators are heated by the heat produced by nuclear fission.

Views Read Edit View history. To define and secure boilers safely, some professional specialized organizations such as the American Society of Mechanical Engineers ASME develop standards and regulation codes. By using this site, you agree to the Terms of Use and Privacy Policy. One consideration is the introduction of feedwater to the boiler.

The fluid at that point may be a mix of steam and liquid droplets as it passes into the condenser. Mechanical forced draught is provided by means of a fan forcing air into the combustion chamber. The induced draught fan works in conjunction with the forced draught fan allowing the furnace pressure to be maintained slightly below atmospheric.


When water is converted to steam it expands to over 1, times its original volume and travels down steam pipes at over kilometres per hour. As the resulting ” dry steam ” is much hotter than needed to stay in the vaporous state it will not contain any significant unevaporated water.

Some superheaters are radiant type, which as the name suggests, they absorb heat by radiation. Cast iron may be used for the heating vessel of domestic water heaters. In the event of a major rupture of the system, an ever-present hazard in a warship during combatthe enormous energy release of escaping superheated steam, expanding to more than times its confined volume, would be equivalent to a cataclysmic explosion, whose effects would be exacerbated by the steam release occurring in a confined space, such as a ship’s engine room.

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. Wrought iron boilers corrode far more slowly than their modern-day steel counterparts, and are less susceptible to localized pitting and stress-corrosion. However, the overall energy efficiency of the steam plant the combination of boiler, superheater, piping and machinery generally will be improved enough to more than offset the increased fuel consumption.

Thin and brittle metal shells can rupture, while poorly welded or riveted seams could open up, leading to a violent eruption of the pressurized steam. 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.

Association of Water Technologies: This iron was often obtained from specialist ironworkssuch as those in the Cleator Moor UK area, noted for the high quality of their rolled platewhich was especially suitable for use in critical applications such as high-pressure boilers.

Retrieved from ” https: High Pressure Boilers 3rd ed. Balanced draught is obtained through use of both induced and forced draught. A boiler that has a loss of feed water and is permitted to boil dry can be extremely dangerous.

Historically, boilers were a source of many serious injuries and property destruction due to poorly understood engineering principles. The term “boiler” should not be used for a supercritical pressure steam generator, as no “boiling” occurs in this device. Boilers Chemical equipment Plumbing Heating, ventilating, and air conditioning.


Most modern boilers depend on mechanical draught rather than natural draught.

The source of heat for a boiler is combustion of any of several fuelssuch as woodcoaloilor natural gas. In the 20th century, design practice moved towards the use of steel, with welded construction, which is stronger and cheaper, and can be fabricated more quickly and with less labour. Stainless steelespecially of the austenitic types, is not used in wetted parts of boilers due to corrosion qac stress obiler cracking.

Although superheating adds more energy to the steam in the form of heat there is no effect on pressure, which is determined by the rate at which steam is drawn from the boiler and the pressure settings of the safety valves. The asc vessel of a boiler is usually made of steel or alloy steelor historically of wrought iron. This is more common with larger boilers where the flue gases have to travel a long distance through many boiler passes.

Boiler – Wikipedia

All these factors make proper draught hard to attain and therefore make mechanical draught equipment much more reliable and economical. High pressure, superheated steam can be extremely dangerous if it boler escapes. 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.

Some are a combination of the two types.

The water entrained in the steam may damage turbine blades or in the case of a reciprocating steam enginemay cause serious mechanical damage due to hydrostatic lock. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, [1] [2] including water heatingcentral heatingboiler-based power generationcookingand sanitation.

Also, higher steam pressure will be possible than with saturated steam, enabling the steam to carry more energy.

Special methods of coupling steam pipes together are used to prevent leaks, with very high pressure systems employing welded joints to avoided leakage problems with threaded or gasketed connections.

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