THE DISTURBANCE FACTOR DURING STEAM BLOW

[energyhack]

We are preparing a steam blow procedure for a boiler and steam pipes upstream of a steam turbine.
Usually the disturbance factor can be calculated by the ratio of the pressure drop over the supheater during blowing to that calculated at boiler MCR.But it is not very precise.

So how to calculate K=(Mb^2*Vb)/(Mf^2*Vf)(because the blowing flow can not be measured accuratly)
where Mb is steam flow rate during blowing
Mf is steam flow rate at full load
Vb is specific volume of steam during blowing
Vf is specific volume at full load.

what should we do duriing the design stage.
Any help appreciated!

 

[MJCronin]

https://www.eng-tips.com/viewthread.cfm?qid=347317

MJCronin
Sr. Process Engineer

 

[energyhack]

It seems that 2 methods applied to steam blow out. in firs method a sacrifice valve positioned at the end of pipeline and before temporary line ( valve must be quick open type) and after pipe filled with steam up to desired pressure, sacrifice valve will be opened and for some minutes (5-15 minute)steam is blown with maximum rate that boilers can provide without loss of water level at steam drum.

Yes，we use first method，in this equal “K=(Mb^2*Vb)/(Mf^2*Vf)”，we can not read Mb.
This question made me puzzled.

 

[MJCronin]

This paper contains a discussion of the K factors and alternative methods to achieve cleanliness ...

http://e2014.drustvo-termicara.com/papers/download/101

MJCronin
Sr. Process Engineer