Question

______ increses the steam raising capacity of a boiler.

• A. Water level indicator
• B. Economizer
• C. Pressure guage
• D. Steam stop valve

Hint:

Boiler accessories (like economizers and air preheaters) increase efficiency and capacity, whereas boiler mountings (like pressure gauges and safety valves) ensure safe operation.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Boilers are closed vessels used to generate steam for food processing operations. Boiler accessories are devices installed to increase the thermal efficiency and capacity of the boiler.

Step 2: Detailed Explanation:
- An economizer is a heat exchanger that recovers waste heat from the hot flue exhaust gases leaving the boiler.
- It uses this recovered heat to preheat the cold feed water before it enters the boiler drum.
- Because the water enters the boiler at a higher initial temperature, less fuel energy is needed to convert it to steam.
- This significantly increases the boiler's overall thermal efficiency and its steam-raising capacity.
- Water level indicators, pressure gauges, and steam stop valves are safety and control mountings, not efficiency-boosting accessories.

Step 3: Final Answer:
An economizer increases the steam-raising capacity of a boiler by preheating the feed water.