Question

The steam temperature with increase in load in case of boiler fitted with radiation superheater

1. Increases
2. Decreases
3. Remains Unaffected
4. first increase then decrease

Answer 1

Correct Answer - Option 2 : Decreases

Explanation:

• A superheater is a device used to convert saturated steam or wet steam into superheated steam. Superheated steam is used in steam turbines for electricity generation, steam engines and steam formation. There are three types of superheaters: radiant, convection, and separately fired.
•  A radiant superheater is placed directly in the radiant zone of the combustion chamber near the water wall so as to absorb heat by radiation.
• With the increase in load i.e. increase in electrical energy or heat energy requirement, since more thermal energy is extracted from the steam, the steam temperature decreases.

• A convection superheater is located in the convective zone of the furnace usually ahead of the economizer (in the path of the hot flue gases). These are also called primary superheaters.
• A separately fired superheater is a superheater that is placed outside the main boiler, which has its own separate combustion system