Posted by Buddy on June 25, 2000 at 21:30:56:
In Reply to: Steam Purity - What happens to the solids? posted by Buddy on June 23, 2000 at 21:01:02:
: Got a couple of questions and I hope the gurus who frequent this site can shed a little light
: on the subject. If this question is overly basic, please cut a beginner some slack.
: We have two low pressure HRSG's (150psi) that produce superheated steam (250 degC) to
: drive a 2MW steam turbine. The conductivity in steam drums are on the average 1000 micro-mhos/cm.
: Since we don't have a device to measure steam purity at the inlet to the turbine, I am guessing it is in
: the neighborhood of 0.3 micro-mhos/cm (based on manufacturers specs).
: Question #1: What happens to all the solids? How do they reduce from 1000 to 0.3.
: Question #2: Does anyone know of an easy way to calculate steam purity?
I jumped the gun a bit on this post and didn't convert properly from micro-mhos/cm to
micro-Siemens/cm. So ignore the above and let me rephrase the question. With respect to conductivity, will
a sample pulled from the steam drum yield the same results as a sample pulled from the
superheated steam line prior to the turbine? OR Can we expect to see some of the solids fall out as the steam passes from
saturated to superheated?