What are the main components of a boiler?

The key elements of a boiler include the burner, combustion chamber, heat exchanger, exhaust stack, and controls. Boiler accessories including the flue gas economizer are also commonly used as an effective method to recover heat from a boiler.

What are the parts of steam boiler?

Steam boiler parts and components Different boilers might have different designs, but three main parts remain the same throughout various designs: The combustion chamber, the heat exchanger, and the burner.

Which boiler component regulates the supply of water?

Feedwater system Feedwater system. The feedwater system channels water into the boiler and automatically controls it to satisfy steam requirements.

What are the 3 types of boilers?

There are three main types of boilers you can install into your home: combi boilers, heat only (regular boilers) and system boilers.

Which type of water is used in boiler?

The boiler receives the feed water, which consists of varying proportion of recovered condensed water (return water) and fresh water, which has been purified in varying degrees (make up water). The make-up water is usually natural water either in its raw state, or treated by some process before use.

What is the most important valve on a boiler?

The safety valve The safety valve is the most important safety device in a boiler or domestic hot-water system. It is designed to relieve internal pressure if a range of failures occur within the system.

What are boiler sections?

a boiler composed of a number of sections, which are usually of small capacity and similar to, and connected with, each other. By multiplication of the sections a boiler of any desired capacity can be built up. See also: Boiler.

What is safety valve in boiler?

Safety valve is a valve that act as a protection of equipment from exploding or damaging and it is mainly installed in pressure vessels such as chemical plants, electric power boilers and gas storage tanks. … When the pressure becomes higher than the set pressure, Disc starts to lift and discharge the fluid.

What is the principle of boiler?

Working Principle of a Boiler Hot gases are formed by burning fuel in the furnace. These gases are made to come in contact with the water vessel, the point where the heat transfer takes place between the steam and water. Thus, the boiler’s basic principle is to convert water into steam with heat energy.

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What is the pH of boiler feed water?

An important element of boiler feedwater treatment is controlling corrosion by keeping the boiler water slightly alkaline, between 7 and 9 on the pH scale.

Where is the mud drum on a boiler?

The upper drum is the steam drum, and the lower drum is the mud drum. Chemicals are added to the boiler feedwater that enters these drums in order to prevent fouling and corrosion. Water tube boiler a type of boiler that contains water-filled tubes that allow water to circulate through a heated firebox.

What’s the purpose of the zinc rod used in steel boilers?

What is the purpose of the zinc rod used in steel boilers? It prevents corrosion by reacting with corrosive elements before they attack the boiler.

What is boiler PDF?

A steam boiler is a closed vessel, generally made of steel, in which water is heated by some source of heat produced by combustion of fuel and ultimately to generate steam. The steam produced may be supplied at low pressure for industrial process work in cotton mills, sugar industries etc.

Which type of boiler is best?

Combi boilers are probably the most cost-effective residential boiler for most homes. They control both hot water and central heating, and their energy efficiency makes them the unit of choice for environmentally-conscious homeowners.

What are the two types of boiler?

When we think about boilers, there are a two types that typically come to mind; firetube, or scotch marine, and watertube boilers. These types of boilers can be classified as hot water, steam, high pressure, and low pressure.

What is TDS in boiler water?

1 – To control the level of total dissolved solids (TDS) within the boiler. As water is boiled within the boiler and steam is produced, then the solids remain in the water and concentrate. Thus, over time the level of total dissolved solids (TDS) increases.

Why phosphate is added in boiler?

Phosphate compounds are common additives for boiler water treatment. Phosphate compounds react with any remaining hard water compounds to create a soft sludge that is eliminated through blowdown. … Phosphates also scavenge (or remove) any remaining oxygen and create a pH buffer to minimize corrosion potential.

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What is oxygen scavenger in boiler?

Boiler Oxygen Scavengers are used to remove dissolved oxygen from the boiler feed water and boilers. Dissolved oxygen in the boiler is very corrosive at higher temperatures and pressures. This may lead to localized pitting and premature boiler tube failure or excessive feedwater leaks.

What is spalling in a boiler?

Spalling: Spalling is a type of defect, also known as fracture of refractory, which is caused by excessive thermal and/or mechanical load on the refractory.

How many safety valves must each boiler have?

two safety valves In most cases, two safety valves per boiler are required, and a third may be needed if they do not exceed the MFC. There are three main parts to the safety valve: nozzle, disc, and spring. Pressurized steam enters the valve through the nozzle and is then threaded to the boiler.

How often should boilers be inspected?

annually While every boiler should be professionally inspected annually, there is more than one type of inspection made by an inspector. Jurisdictions and insurance companies recommend that power boilers be inspected annually, both internally and externally, while not under pressure.

What are the types of boiler?

Boilers can be broadly classified as shell tube and water tube boilers.

  • Shell and tube boilers. Shell and tube boilers are also referred to as fire tube or smoke tube boilers. …
  • Different types of fire tube boilers: …
  • Lancashire boiler: …
  • Locomotive boiler. …
  • Reversal Chamber: …
  • Wet Back Boilers: …
  • Dry Back Boilers: …
  • Two pass boilers:

What is boiler drum?

A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.

What is water wall in boiler?

Water Wall Tubes: These are tubes in the boiler where water is evaporated to steam and are also called steam generating tubes. These tubes also form the walls of the boiler and are hence called water walls or water wall panels.

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What is PSV valve?

A Pressure Safety Valve (PSV) is a type of valve used to quickly release gasses from equipment in order to avoid overpressurization and potential process safety incidents. PSVs are activated automatically when pressure exceeds prescribed pressure limits in order to return equipment pressure to a safe operating level.

What is the function of fusible plug?

Purpose. A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. Fusible plugs are commonly installed in aircraft wheels, most typically in those of larger or high-performance aircraft.

Where is fusible plug located?

Typical locations for fusible plugs include the crown sheet (top of combustion chamber), rear tube sheet (Scotch marine boiler) and front tube sheet (firebox boiler). The location chosen depends upon the boiler design.

How steam is produced in boiler?

How Does A Boiler Work? A steam boiler operates through a combustion reaction between fuel and air, which ignites a flame into tubes that are submerged in water. The heat from this combustion is then transferred from the tube to the water in which the tubes are submerged. The water is then evaporated into steam.

In what form is the coal used in boiler?

Bituminous coal is commonly used in power plant boilers for generation of electric power. Bituminous coal has a higher boiler heating value than either sub-bituminous or lignite, but less than that of anthracite.

What is accessories of boiler?

The following are the important accessories of the boiler are: Feed water pump Injector Pressure reducing valve Economiser Air pre heater Super heater Steam drier or separator Steam trap 1. Feed water pump: the feed water pump is used to feed water to the boiler.