Plant, Equipment and Furnace Design Set 1

Soaking pit ✘ Sintering machine ✘ Beehive oven ✘ None of these ✔

No O2 in flue gas ✘ CO in flue gas ✘ High excess air ✘ None of these ✔

Furnace employing neutral atmosphere ✘ Carbon resistance furnace ✘ Reducing atmosphere ✘ Furnace employing negative pressure ✔

Hearth area and furnace temperature ✘ Emissivity of the stock ✘ Ratio of wall surface to stock surface ✘ All (a), (b) and ✔

Temperature of flue gas ✘ Thermal conductivity of stock ✘ Thickness of heating stock ✘ All (a), (b) and ✔

Oxidation/scaling ✘ Decarburising ✘ Sulphur penetration ✘ Either of the above ✔

CO ✘ H2 ✘ High CO/CO2 ✘ All (a), (b) & ✔

Increase in heating capacity/m2 of floor space ✘ Elimination of cold spot at the bottom of the charge ✘ Reduction in the temperature of furnace gases ✘ Protection of the periphery of the charge from excessive radiation ✔

Walking beam ✘ Shaft ✘ Tunnel ✘ Rotary hearth ✔

Change in volume during a change of temperature ✘ Difference in density between hot and cold gases ✘ Furnace pressure in conjunction with draft in flues ✘ All (a), (b) and ✔