Construction and Working Principle of Scotch Marine Boiler

By the name of Scotch Marine Boiler, we can understand it’s a marine boiler. That’s means this boiler is used in the marine sector.  Scotch marine boiler is one of the most common boilers which are used on ships. In this post, we will learn about the scotch marine boiler construction, working principle with its advantage.

Scotch Marine Boiler
Scotch Marine Boiler. Source-SSMaster

Scotch Marine Boiler:

First of all Scotch Marine Boiler is a Fire Tube Boiler. It is also a scotch or tank-type boiler. It is a common boiler in the marine industry. This boiler has some special advantages like its compactness and operation efficiency. Scotch Marine Boiler can use any type of water.

The general layout of the Scotch Marine Boiler is that of a squat horizontal cylinder. At the lower part of the boiler shell, one or more large cylindrical furnaces are present. Burned gases and smoke from the boiler furnace pass through the backside of this boiler. After that gases and smoke return through the small tubes and up and out through the boiler chimney.

Related: Construction and Working Principle of Locomotive Boiler

Types of Scotch Marine Boiler:

Single Ended: Generally the single-ended steam boiler contains one to four furnaces. All these furnaces enter from the front part of the boiler. Normally the length of the single-ended steam boiler can be 3.5 meters.

Double Ended: Furnaces are present at both ends of this type of boiler. But a number of furnaces with the boiler varies from 2 to 4 in each end. Normally the length of the double-ended steam boiler can be 6.5 meters.

Construction of Scotch Marine Boiler:

This boiler consists of some basic components like another boiler. I am going to give you more details about each element. If I missed any of it then please let me know in a comment.

First of all, it’s Furnace, and like other boilers, it used to burn the fuel inside the boiler. We already know that a single-ended scotch marine boiler is fired with four furnaces. But each of the furnaces has its own combustion chamber with it. Now come to another component which is a combustion chamber. It is one of the parts of the boiler where the fuel combustion normally takes place. You will also find plates in the combustion chamber.  It requires staying the top plate, back plate, two side plate, and the tube plate. There are some smokes tubes placed horizontally. All those smoked tubes connect the combustion chamber to the chimney.

Related: Construction and Working Principle of Lancashire Boiler

Next component is the smoke box. This boiler has numbers of smoke tubes. We already know that all are tubes placed horizontally and connects each other from the combustion chamber to the chimney. After fuel combustion, burned smoke passes through smokes tubes and then it enters the chimney.

Like others, boiler Chimney is used to exhaust the burned gases and smoke out of the boiler during operation. Exhaust gases release into the environment by the chimney. Another important component is the Boiler shell. It will be better you know how boiler shell made. “Boiler – How It’s Made?” read this article and you will know how boiler shell is made. It protects the internal parts of the boiler. Boiler shell size and its thickness depending on the amount of pressurized steam required for the purpose.

Working of Scotch Marine Boiler:

Working on the boiler is very simple. It will take the fuel, burn it in the combustion chamber and water will be heated. After then heated water becomes steam. For this reason at first fuel is inserted into the furnace. Fuel passes through the furnace by fire hole. When there is fuel in the furnace then it ignites through the fire hole. After that burnt fuel enters the combustion chamber and this is the place where combustion of the fuel takes place. Now come to the heat transfer procedure. When heat generated into the combustion chamber then it is used to heat the water surrounding the combustion chamber. Again it is the basic heat transfer procedure for regular fire tube boiler.

When water becomes steam, then it supplies to the steam turbine. Here we have some burnt flue gases and smoke that created at the fuel combustion procedure and it needs to release in the environment. For this step the exhaust gases pass through the smoke tubes and reaches to the boiler chimney. Then the chimney releases all smoke and exhaust gases into the atmosphere. In this boiler, the water uses to surround with the furnace, combustion chamber and the smoke tubes. For this reason, it provides the greater heating surface to the water during boiler operation.

Advantages of Scotch Marine Boiler:

This boiler has a great advantage and for this reason, this boiler is generally used in marine works and on ships.  It is a compact size boiler and it has great efficiency in operation. Also, this boiler can generate steam by any type of water. Brick work setting like Locomotive Boiler and external flues are not required in this boiler.

Related: Fire Tube Boiler

If you like this post, then please shares with your friends and let us know in comments if we missed any part to explain. Thanks!

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