Posted by Tarzan on June 18, 2001 at 09:28:25:
In Reply to: to manny silver tarzan & raymonds posted by zaib on June 17, 2001 at 08:12:59:
: my no.2 question was that how we will come to know that what percentage of continuous blow down (c.b.d.)valve we should open so that we may keep concentration of dissolved solid in boiler water within limits. you know that there is a scale fitted on c.b.d. valve which shows opening of c.b.d. valve in percentage. (simply i want to ask you , is there any formula that can tell us what percentage of c.b.d. valve we will need to open to control the t.d.s. of boiler water. as a friend has already suggested that it can be adjusted on the basis of c.c. i want to know how we will adjust c.b.d.)
: thanks.
Determine the cycles on concentration first....compare it to your feed rate and adjust the c.b.d. accordingly....fine tune it to conserve water and chemicals...then thump your chest and show your boss the savings...
Listen to Raymond too....if your downstream process keeps things unstable, then do what you can to react to the swing....
c.b.d. rate based on c.c. is the answer providing your steam cycle remains rather stable....
I've managed to get our water use and chemical use down to 25% of what it was just 4 months ago...fixed the condensate leaks first....now I will fine tune the c.d.b. to get the rest of the savings...the gas meter will show it all....
Just remember that every drop of city water has to be heated and chemically treated...and every drop of city water contains imputities that require increased c.d.b....so fix the leaks, insulate the pipes and graph the trends out on paper....watch your condensate temps to detect any leaking traps and observe the city make up meter to see any increase in raw water consumption...it will all show up eventually as a decrease in fuel, water and chemical consumption....that's why you get the big bucks....you can save them fuel while providing a reliable supply of steam...