Calculating Intermittent Blowdown Rate for Boiler
Calculating Intermittent Blowdown Rate for Boiler
(OP)
I've looked around the net, and while there are sources that detail the calculations involved in determining continuous blowdown rate, tips on intermittent blowdown rates amount to little more than "shorter, more frequent blows are better than longer, less frequent blows," and recommend blowdown periods of anywhere between 10 seconds and 2 minutes. 280 psig saturated, 55k lb/hr output, 48k lb/hr condensate return.
HALP!
HALP!





RE: Calculating Intermittent Blowdown Rate for Boiler
As far as frequency is concerned, if your steam quality is poor, then you need to do it more often.
I2I
RE: Calculating Intermittent Blowdown Rate for Boiler
Surface blows are usually continuous and at a very small flow rate. Surface blows are to remove "floaties" as well as TDS control.
rmw
RE: Calculating Intermittent Blowdown Rate for Boiler
I am assuming that you have a small packaged watertube boiler...
Intermittent blows are typically done once per shift and, yes, they will depend mostly on the policy of the owner and on the desired water quality.
They usually last a few seconds
-MJC
RE: Calculating Intermittent Blowdown Rate for Boiler
The bottom blowdown is used to remove suspended solids that have settled to the bottom (or 'mud'). A short quick blowdown will suck this muck out. Usually performed once a shift, once a day, or even once a week for cleaner systems.
The rate can be found if you know your bottom blowdown valve, differential pressure, and time you leave the valve open....
Joe Lambert
http://www.control-associates.com/
RE: Calculating Intermittent Blowdown Rate for Boiler