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

A. Gate
B. Butterfly
C. Globe
D. None of these

A. Waste heat recovery from flue gas
B. Minimising heat losses from furnace walls
C. Maintaining proper draught
D. All A., B. and C.

A. Reduces the flue gas temperature and makes the furnace atmosphere oxidising
B. Increases the load on the induced draft fan
C. Reduces the furnace draught
D. All A., B. and C.

A. Temperature of flue gas
B. Thermal conductivity of stock
C. Thickness of heating stock
D. All A., B. and C.