Question

What is the major disadvantage of fluidized bed dryer?

• A. Attrition of particles
• B. Non uniform drying
• C. Time consuming
• D. Lack of cost effectiveness

Hint:

FBD is fast and uniform, but the "bumping" of particles leads to "breaking" (Attrition).

Answer 1

The Correct Option is A

Step 1: Concept
Fluidized Bed Dryer (FBD) is used for drying granules by suspending them in a stream of hot air, creating a "fluid-like" state.

Step 2: Meaning
Attrition refers to the wearing away or breaking of particles due to friction and collision with each other or the equipment walls.

Step 3: Analysis
Because the particles are in constant high-velocity motion and frequently collide, the granules can break down into smaller "fines." This attrition is the primary drawback of this otherwise efficient and uniform drying method.

Step 4: Conclusion
Hence, the significant disadvantage of FBD is the attrition of particles.

Final Answer: (A)