The leakage of ambient air into furnaces through gaps, charging ports, and apertures ________________?
Show answer Hide answer
Answer: D. All A., B. and C.
Explanation
Air infiltration into furnaces cools the combustion gases significantly. It alters the internal atmosphere by introducing unwanted oxidizing oxygen. Infiltration increases fan load and disrupts internal draft control balance. Gaps and charging ports allow ambient air to leak into negative pressure furnaces. Cold air mixing with hot flue gases lowers overall thermal efficiency. Draft fans must work harder to exhaust the extra volume of infiltrated air.
Furnace operators inspect seals regularly to prevent costly ambient air leakage. Oxidizing atmospheres caused by air leaks ruin metal stock through excessive scaling. Maintaining proper furnace pressure prevents air infiltration and saves fuel. Reduces flue gas temperature and makes atmosphere oxidising describes one valid effect. Increases load on the induced draft fan describes the mechanical impact of leaks. Reduces furnace draught describes the operational disruption caused by air inleakage.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Ostwald charts are utilized for__________________?
Show answer Hide answer
Answer: A. Computing the excess/deficiency of combustion air
Ostwald charts provide graphical relations between carbon dioxide and oxygen. They allow operators to easily compute the excess or deficiency of combustion air. Analyzing flue gas composition on the chart reveals burner...
Q2. Metallic recuperators are avoided for waste heat recovery when hot flue gases exceed _____________ °C to prevent corrosion issues?
Show answer Hide answer
Answer: B. 750
Metallic recuperators are avoided for waste heat recovery above 750 °C. High temperatures cause severe metal oxidation and structural corrosion issues. Metallic alloys lose mechanical strength and creep under high therma...
Q3. Flue gases leaving a gaseous fuel-fired furnace should ideally contain an oxygen percentage near _____________ percent?
Show answer Hide answer
Answer: A. < 2
Well-operated gas-fired furnaces maintain very low excess air levels. This precise control results in an ideal flue gas oxygen percentage below 2 percent. Low oxygen levels minimize sensible heat losses escaping through...
Q4. A neutral atmosphere is sustained inside a/an ____________ furnace?
Show answer Hide answer
Answer: A. Cold rolled steel coil annealing
Cold rolled steel coil annealing requires a protective non-reactive atmosphere. Nitrogen-hydrogen gas mixtures are used to sustain a neutral surface condition. This prevents oxidation and discoloration during prolonged h...
Q5. The presence of SO2 within furnace gases induces ferrous metal corrosion through_________________?
Show answer Hide answer
Answer: D. All A., B. and C.
Sulfur dioxide in furnace gases accelerates ferrous metal scaling rates. It causes severe metal embrittlement during high temperature processing. It attacks grain boundaries, causing severe damage on low carbon steels. S...
Q6. Furnaces firing pulverized fuel utilize ______________ fuel injection?
Show answer Hide answer
Answer: D. All A., B. and C.
Pulverized fuel furnaces utilize various fuel injection configurations. Horizontal, vertical, and tangential firing methods ensure complete combustion. Different burner arrangements optimize residence time and flame turb...