Question of the Month – 2018

Question of the Month for February 2018

QUESTION:

Can plant efficiency be increased if a closed feedwater heater is used? ANSWER:

ANSWER:

Yes, it is possible to increase plant efficiency when heating feed water in a closed feed water heater.  A good example of this is when steam is extracted or bled from a high-pressure stage of a steam turbine and used in a closed feed water heater.  The latent heat of the steam is recovered in the feed water instead of being lost in the condenser.

 

Question of the Month for January 2018

QUESTION:

What is the difference between a flush-front and an extended-front horizontal return-tubular boiler?

 ANSWER:

In the extended-front type horizontal return-tubular boiler the front tube sheet is set in line with the front of the boiler setting.  The lower part of the shell extends beyond the tube sheet.  This extension forms part of the smoke box and is known as the dry sheet.

The shell of the flush-front type horizontal return-tubular boiler does not extend beyond the front tube sheet.  The front of the boiler is set back from the front of the setting to allow a space which forms the smoke box.  An arch at the front of the furnace prevents the gases from entering this space and going directly to the stack.