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Chemical Engineering :: Furnace Technology

  1. To reduce the stack loss, heat recovery from flue gas can be done by

  2. A.
    preheating of cold stock.
    B.
    preheating of combustion air.
    C.
    steam generation in waste heat boilers.
    D.
    all (a), (b) and (c).

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  3. Large tonnage of refractory bricks are dried in a

  4. A.
    shaft furnace
    B.
    rotary hearth furnace
    C.
    tunnel kiln
    D.
    muffle furnace

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  5. Pulverised fuel fired furnaces employ __________ fuel firing.

  6. A.
    horizontal
    B.
    vertical
    C.
    tangential
    D.
    all (a), (b) and (c)

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  7. Which of the following is not a directly fired furnace ?

  8. A.
    By-product coke oven
    B.
    Calcination kiln
    C.
    Sintering furnace
    D.
    Open hearth furnace

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  9. The reason for excessive clinker formation in gas producers is the

  10. A.
    use of coal/coke containing a high % of fines and ash.
    B.
    use of fuel having too low an ash fusion temperature.
    C.
    development of hot spots in the fuel bed and an abnormally high rate of gasification.
    D.
    all (a), (b) and (c).

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  11. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

  12. A.
    Ammonia
    B.
    Fine dolomite
    C.
    Alkaline powders
    D.
    None of these

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  13. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

  14. A.
    80
    B.
    130
    C.
    180
    D.
    250

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  15. Low stack loss indicates the

  16. A.
    use of sub-stoichiometric air for combustion.
    B.
    efficient use of fuel.
    C.
    inefficient use of fuel.
    D.
    oxygen enrichment of combustion air.

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  17. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

  18. A.
    20
    B.
    40
    C.
    60
    D.
    80

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  19. Heat transfer rate to the stock/charge in the furnace does not depend upon the

  20. A.
    emissivity of the refactory walls.
    B.
    size of the furance.
    C.
    use of waste heat recovery equipments.
    D.
    thickness of the stock.

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