create vacuum

inject chemical solution in feed pump

pump water, similar to boiler feed pump

add make up water in the system

higher value

lower value

same value

any value

the draft to be created

limitation of construction facilities

control of pollution

quantity of flue gases to be handled

boiler drum

superheater tubes

economiser

a separate coil located in convection path.

more

equal

less

could be more or less depending on the size of plant