Once through boiler - Benson boiler

The correct answer to the question is option 'C', which is the Benson boiler. Let's delve into the details of why the Benson boiler is considered a once-through boiler.

Definition of Once Through Boiler

A once-through boiler is a type of boiler in which water is passed through the boiler tubes only once. Unlike traditional boilers where water passes through multiple times, in a once-through boiler, water is continuously fed into the boiler and steam is produced rapidly.

Benson Boiler

The Benson boiler is a type of once-through boiler that was developed by Mark Benson in the early 20th century. It is known for its high efficiency and rapid steam production. The main characteristic of the Benson boiler is its ability to produce superheated steam at high pressure.

Working Principle

In a Benson boiler, water is pumped at high pressure into the boiler where it is heated to produce steam. The water is not stored in the boiler for a long time, unlike traditional boilers, but instead, it flows through the tubes once and is quickly converted into steam. This rapid steam production makes the Benson boiler highly efficient.

Advantages of Benson Boiler

- High efficiency due to rapid steam production
- Ability to produce superheated steam at high pressure
- Compact design compared to traditional boilers
- Lower fuel consumption

In conclusion, the Benson boiler is considered a once-through boiler due to its unique design and working principle, which allows for rapid steam production and high efficiency.