To reduce the stack loss, heat recovery from flue gas can be done by_____________________?

Related Mcqs:

1. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?

   A. Furnace oil with air B. Furnace oil with oxygen C. Blast furnace gas with air D. Blast furnace gas with oxygen...

2. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?

   A. 350 B. 750 C. 1050 D. 1250...

3. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?

   A. Economiser B. Regenerator C. Ceramic recuperator D. Waste heat boiler...

4. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?

   A. Quantity & temperature of waste gas B. Dust concentration & nature of dust in waste gas C. Corrosive nature of the waste gas D. All A., B. and C....

5. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?

   A. Rate of firing and emissivity of flame B. Thermal conductivity of the charge & structural materials of furnace C. Nature of process; whether batch, continuous or intermittent D. All A., B. and C....

6. Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?

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

7. Regenerators are used for waste heat recovery in____________________?

   A. By-product coke ovens B. Beehive coke oven C. Blast furnace stoves D. Soaking pits...

8. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an_________________?

   A. Economiser B. Steam superheater C. Air preheater D. All A., B. and C....

9. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?

   A. < 2 B. < 5 C. < 8 D. < 10...

10. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?

    A. Use of non-preheated combustion air B. Use of pulverised solid fuels C. Imperfect mixing of fuel & air and infiltration of air D. Use of excessive positive draft in the furnace...