Question: 5 . How does catalytic cracking differ from thermal cracking in petroleum refining? 6 . What role does hydrogen play in the hydrocracking process? 7

5. How does catalytic cracking differ from thermal cracking in petroleum refining?
6. What role does hydrogen play in the hydrocracking process?
7. Why is excess air used in combustion processes, and what are the potential disadvantages of using too much?
8. Describe the operational advantages of using a fluidized bed combustion system for low-grade fuels.

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