Marine Boiler

July 03, 2024 Post a Comment

Marine boiler

Marine boilers used in ships today are mostly for auxiliary purposes in vessels that run on marine diesel engines or diesel-electric propulsion. In the case of ships using steam turbines (mostly found in high-speed vessels used by navies), boilers are a part of the main propulsion system.

What are the types of marine boiler?

5 Types of Marine Boilers

The Water-tube Boiler.
The Main Propulsion Boiler.
The Auxiliary Boiler.
The Waste Heat Boiler.
The Composite Boiler.

What is the most common type of boiler used in marine vessels?

Another most common type of boiler found on ships is the composite boiler, where the exhaust heat of the main engine or generator engine is used to additionally heat the water or generate the steam. Technically, composite boiler is an integration of exhaust gas boiler and oil-fired boiler.

Which boiler is used for marine applications?

The watertube boiler is employed for high-pressure, high-temperature, high-capacity steam applications, e.g. providing steam for main propulsion turbines or cargo pump turbines. Firetube boilers are used for auxiliary purposes to provide smaller quantities of low-pressure steam on diesel engine powered ships..

What are the 3 types of boilers?

There are three main types of boiler: combi, heat only and system. Heat only boilers (aka conventional or regular) work with a cylinder in the airing cupboard. System boilers are often found in modern homes with an 'unvented' hot water cylinder (but they can work with a vented cylinder also).

What are the 2 types of boiler?

There are two basic types of boilers: firetube and watertube. The fundamental difference between these boiler types is which side of the boiler tubes contain the combustion gases or the boiler water/steam.

What is pressure for marine boiler?

Medium pressure boiler: It has a working pressure of steam from 15 bars to 80 bars and is used for power generation or combined use of power generation and process heating. High pressure boiler: It produces steam at a pressure of more than 80 to 200 bars.

What is the principle of boiler?

Working Principle of Boiler Hot gases are produced by burning fuel in the furnace. These hot gases are made to come in contact with the water vessel where the heat transfer takes place between the water and the steam. Therefore, the basic principle of the boiler is to convert water into steam by using heat energy.

What are the parts of marine boiler?

Different components or parts of a boiler

Steam drum. Earlie the drum of boilers were used to be made from riveting method, but now with advancement in the welding technology, drums are made with welding.
Water drum. ...
Headers. ...
Generating tubes. ...
Screen tubes and Water wall tubes. ...
Down comers and Riser tubes.

Why sea water is not used in boiler?

Sea water contains soluble salts of calcium and magnesium, which on boiling change to insoluble salts and get deposited as a crust on the inner sides of a boiler. This crust acts as a bad conductor of heat and prevents the flow of heat to water. A large quantity of fuel gets wasted.

What fuel do marine boilers burn?

Types of Marine Boiler Burner. In a marine boiler, oil fired burner is normally used with diesel or heavy fuel oil as burning fuel. The fuel to be used has to be clean and with correct temperature and viscosity for rapid combustion.

How many types are boiler?

There are mainly two types of boiler – water tube boiler and fire tube boiler.

What are the main parts and its functions of a marine boiler?

The boiler is the part of the system that heats the water to be distributed. 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 is marine fire-tube boiler?

The Scotch Marine Boiler is a fire-tube boiler, in that hot flue gases pass through tubes set within a tank of water. The general layout is that of a horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes.

What is the most important aspect of a marine boiler?

The most important aspect of any marine boiler is maintaining the correct water level. As the boiler fires, steam liberates from the surface of the water and thus as the steam gets consumed, there is subsequent drop in water level inside the boiler.

What fuel is used in boilers?

The primary boiler fuels are coal, oil, and gas. Oil and gas involve the simplest controls, since they can be measured easily and flow is regulated by a control valve in the fuel line.

What kind of boiler is best?

Condensing boilers are the best types of boilers for the environment. Condensing boilers allow you to heat your home in a way that's much more efficient, and that means you'll save money on your heating bills and save energy as well.

Which type of boiler is most efficient?

A condensing boiler recovers more heat from the exhaust flue gas and uses it to heat the central heating water, making it more efficient than older boilers.

What is a 3 pass boiler?

A 3-pass boiler design is the most efficient way to get the maximum amount of heat from the fuel. The design extracts heat from three times as much interior surface area of the boiler, compared to a single-pass, “pin-type” boiler design.

Which oil is used in boiler?

fuel oil, also called furnace oil, fuel consisting mainly of residues from crude-oil distillation. It is used primarily for steam boilers in power plants, aboard ships, and in industrial plants. Commercial fuel oils usually are blended with other petroleum fractions to produce the desired viscosity and flash point.