Water Treatment for Closed Boiler System
Water Treatment for Closed Boiler System
(OP)
We're considering a thermosiphon reboiler, carbon steel construction with an electric element, providing saturated steam at 260-300 C to a coil in a pilot plant process vessel.
The water/steam system is totally closed, and will only be opened if leakage has depleted the water sufficiently. There are very few joints in the system so it shouldn't be opened often.
Any recommendations on a passivation procedure prior to protracted operation? Any recommendations for water preparation? Don't direct us to Nalco or the like, because they're not anxious to bother answering questions like this if there's no ongoing need for chemicals.
The water/steam system is totally closed, and will only be opened if leakage has depleted the water sufficiently. There are very few joints in the system so it shouldn't be opened often.
Any recommendations on a passivation procedure prior to protracted operation? Any recommendations for water preparation? Don't direct us to Nalco or the like, because they're not anxious to bother answering questions like this if there's no ongoing need for chemicals.





RE: Water Treatment for Closed Boiler System
Our plant operates in this range on a very large scale. Our pilot plant has numerous small systems operating in this range.
RE: Water Treatment for Closed Boiler System
These chemicals are cheap and have worked well for many years.
RE: Water Treatment for Closed Boiler System
Unclesyd: Good suggestion. We've considered it, but there's too little space inside the pressure vessel to fit a big enough coil to so we could get away with using hot oil vapour instead of steam- and too much of a problem if (when) the process vessel coil fails if we go that route.
RE: Water Treatment for Closed Boiler System
What can be important is to sterilize the system by heating it up very soon after filling it. Some of the worst bacteria involved with MIC are the sulfate-reducers (desulfovibrio desulfuricans--try saying THAT fast!), and the don't need oxygen to set up their drill presses on your system. In fact, oxygen makes they go dormant.
They'll drill thru 304/316 faster than a union worker on group-piecework!
RE: Water Treatment for Closed Boiler System