Related Questions

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
A Fireclay
B Silicon carbide
C Corrundum
D Siliceous fireclay
Ceramic recuperators compared to metallic recuperators for the same duty
A Are lighter
B Occupy more space
C Are less costly
D Have higher pressure differential between flue gas & air side
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
A Recuperator
B Regenerator
C Waste heat boiler
D None of these
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
A Efficiency of the boiler
B Efficiency of the chimney
C Efficiency of the fan
D Power of the boiler
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
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
A 250
B 650
C 850
D 1000
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 of the above
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as
A Superheater
B Air-preheater
C Economizer
D Injector

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