Furnace Technology Questions

• Regenerators compared to the recuperators for the same duty
• Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
• Heat balance of furnace provides means of determining the
• Hearth furnaces are not used for
• In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
• Furnace pressure is normally controlled by regulating the
• Which of the following is a periodic furnace?
• Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
• An example of indirectly heated furnace is the
• Forced recirculation of furnace gases is practised
• Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
• The method of Lobo and Evans is concerned with the calculation of the
• Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
• In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
• Which furnace employs natural draft?
• Turndown ratio of a burner gives an idea of the __________ in the furnace.
• Regenerators are used for waste heat recovery in
• Dampers are located
• Reverberatory furnace is used for
• Protective gas used in the annealing furnace for steel coil comprises of