boiler circulation pump

[pumposervicio]

hi all
pls help me to understand this.

in power plant, why do we need to put a boiler circulation pump to boiler ? what is the use of it? boiler produce steam @ 200deg (c), h= 700m, Q = 50cu.m/hr.

thanks

 

[BigInch]

Is it not reinjecting the spent steam condensate back into the boiler?

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[Unotec]

It is a waste of energy to try to move the condensate back to the boiler using the steam's pressure. Makes the heating loop extremely inefficient

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[TBP]

I suspect there's a language translation issue, and pumposervicio is referring to a boiler feed pump, as opposed to a circulator.

 

[gliwice]

It's difficult to know what this circulation pump will do without looking at the drwaing showing where is attached. Generaly in boilers with natural circulation ( where the movwement of water/steam mixture in boiler tubes is acheived by the means of different water S.G. at the bottom/top of the boiler),
sometimes certain portions of tubing suffer from overheating - hence need to add "circulation pump"
Critical boilers ( where SG of steam vs. S.G. of water is similar) need to use this pump(s) to circulate water/steam mixture through the boiler( not your case).