The correct answer is D. Boiler.
A boiler is a heat exchanger that transfers heat energy from a fuel to water, causing it to boil and turn into steam. The steam is then used to drive a turbine, which generates electricity.
Boiler maintenance is essential to ensure the safe and efficient operation of a steam power plant. The most important aspects of boiler maintenance are:
- Inspection and cleaning of the boiler tubes to remove any build-up of scale or other deposits.
- Inspection and replacement of boiler tubes as needed.
- Inspection and adjustment of the boiler controls.
- Testing of the boiler’s safety systems.
Boiler maintenance should be performed by qualified personnel on a regular schedule. The frequency of maintenance will depend on the type of boiler, the quality of the water used, and the operating conditions.
The other options are not as important as the boiler in terms of maintenance. The steam turbine is a machine that converts the energy of steam into mechanical energy. The condenser is a heat exchanger that cools the steam and condenses it back into water. The water treatment plant is a facility that treats the water used in the boiler to remove impurities.
All of these components are important to the operation of a steam power plant, but the boiler is the most critical. If the boiler is not properly maintained, it can fail, which can lead to serious accidents.