Inlet water for gas fired steam boiler
Inlet water for gas fired steam boiler
(OP)
Hi,
What are the requirements for the inlet water of a gas fired steam boiler?
Since impurities in water cannot be 100% removed, how to solve the scaling problem in the boiler?
Thanks,
What are the requirements for the inlet water of a gas fired steam boiler?
Since impurities in water cannot be 100% removed, how to solve the scaling problem in the boiler?
Thanks,





RE: Inlet water for gas fired steam boiler
It depends... on your application and the water supply and how much tolerance you have. Some boilers are oversized enough that the employees don't need to worry about the mineral content of the water. Some plants are located in areas where the mineral content of the water is low enough that they don't have to worry about scale build-up. Some plants have the luxory of taking a unit off-line every so often for cleaning.
Maybe you can't remove 100% of the impurities ... but you can get it pretty darn close, depending on how much money you're willing to put into it. Also, just because you don't remove 100% of the impurities doesn't mean you will get scale buildup.
So are you wanting to know what steps to take to alter your boiler water input system to improve the water quality? Or are you wanting to know how to remove scale that's already there?
Patricia Lougheed
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RE: Inlet water for gas fired steam boiler
This question has been around for 150 years
Read up..
h
http://www.thermidaire.on.ca/boiler-feed.html
RE: Inlet water for gas fired steam boiler
A google search should find the table that gives the BFW specs based on boiler pressure.
RE: Inlet water for gas fired steam boiler
I know that boiler water needs to be treated before going to the boiler.
The reason I am asking this question is that I asked for a quote from a water treatment unit vendor. And I was told that since the boiler pressure is low (at atmosphere pressure) and there is no blowdown to remove the impurities left in the water after water treatment as it does in high pressure steam generator/drum, there will be scaling build up in the boiler tube. The boiler we will purchase is a gas fired steam boiler.
The water to be boiled off is produced water separated from process gas. It has high content of Na and Ca, Mg, K, Cl, HCO3. I meant to ask to what content the water won't cause much scaling in the boiler so we don't have to spent too much money of water softening or clean the tube too often.
RE: Inlet water for gas fired steam boiler
rmw
RE: Inlet water for gas fired steam boiler
I know that a lot of nuclear reactors in the US have opted to impose stringent water control options up front -- after having faced replacing their steam generators (a steam boiler by another name). They basically try to get as close to demineralized water as they can get.
I think you need to do some economic analyses to figure out which is going to be cheaper. But I wouldn't be surprised if you could justify a lot of water treatment as compared to downtime and cost for cleaning or replacing the boiler.
Patricia Lougheed
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RE: Inlet water for gas fired steam boiler
I talked to the water treatment vendor. He suggested we can use evaporator for our case. I wasn't very familiar with wastewater evaporator to avoild scaling. Is water treatment required for evaporator?
RE: Inlet water for gas fired steam boiler
rmw
RE: Inlet water for gas fired steam boiler
RE: Inlet water for gas fired steam boiler
RE: Inlet water for gas fired steam boiler
For a commercial boiler? Nope
Patricia Lougheed
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: Inlet water for gas fired steam boiler
economics! no one mentioned the size of the boiler.
if a small coffe pot or cappuchinomaker, a filter will do, and up the ladder cost adds up
for small boilers a cheap watetr softener will do.
RE: Inlet water for gas fired steam boiler
I agree with some of the earlier comments about this being quite ugly. What are you trying to do, generate steam or dispose of a waste water stream? I've never heard of combining the two and don't think you can do so successfully. And why don't you have blowdown? You ALWAYS have blowdown in a steam generator. That's how you limit the buildup of non volatile materials such as solids and salts. There's a lot in your postings that just ain't right.
RE: Inlet water for gas fired steam boiler
I made quite a bit of money off of that one when it all caught up with them. I've never seen anything so ugly. I think I could have paved the roads in his plant with that scale it was so tough (and plentiful).
rmw