Previous in Forum: Tesla Earthquake Machine.   Next in Forum: Proper Threaded Pipe Joints
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
6 comments
Rate Comments: Nested
dhayanandhan
Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65

What Are The Deciding Criterion of Boiler Drum Size?

05/18/2010 8:29 PM

The Boiler Design and Capacity has improved tremendously and now a days a single boiler can supply steam to 1000 MW. I have come across a case for identical capacity and pressure of boilers, the Boiler Drum Sizes are different.

Now the question is WHAT ARE THE DECIDING CRITERION FOR BOILER DRUM.?

DHAYANANDHAN.S
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
ducon
Guru

Join Date: Dec 2006
Location: Hop around Toronto, New York & Karachi
Posts: 1876
Good Answers: 19
#1

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/19/2010 2:11 AM

maybe the Steam Turbine attached to it (condensing/extraction) nos of stages.

Nice question I'd love to educate myself too.

__________________
 I not only use all the brains that I have, but all that I can borrow. Woodrow Wilson
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#2

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/19/2010 11:10 AM
  • Feedwater quality
  • Feedwater temperature
  • Blowdown setpoint
  • Fuel type(s)
  • Required steam quality
  • Installation requirements
  • Delivery requirements
  • Etc., etc
__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
AussieBob
Power-User
New Zealand - Member - Member Australia - Member - Member

Join Date: Oct 2008
Location: Auckland, New Zealand
Posts: 463
Good Answers: 43
#3

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/19/2010 11:09 PM

The prime reason for the major difference, will be whether the boiler is natural circulation or forced (assisted) circulation, given equivalent boiler/turbine sets and similar coal specifications. In the natural circulation boiler where there is approx a 4:1 circulation ratio it is not uncommon to have two boiler drums and these would have links on the waterside by crossover pipes. Each drum would approximate to the size of a single drum forced circulation design. The reason for two is the complications of size of manufacture/transport of a single drum.

The selection of material will influence the drum wall thickness.
Register to Reply
dhayanandhan
Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#4
In reply to #3

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/20/2010 12:39 PM

Dear AussieBob,

Thanks for remarks. I meant to ask WHAT ARE THE CRITERION(S) THAT DECIDE THE BOILER DRUM SIZE or CAPACITY. In my question I have mentioned that identical capacity and pressure boilers has DIFFERENT SIZE of drums.

How to decide the size of the Drum is the question.

Thanks,

DHAYANANDHAN.S
Register to Reply
AussieBob
Power-User
New Zealand - Member - Member Australia - Member - Member

Join Date: Oct 2008
Location: Auckland, New Zealand
Posts: 463
Good Answers: 43
#5
In reply to #4

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/20/2010 10:38 PM

Hi dhayanandhan,

I see where you are coming from now. The prime purpose of the steam drum is the mechanical phase separation of the water and steam mixture. The efficiencies of the separator and drier elements and their physical size will affect how much "hardware" takes up space inside the drum. These and the boiler flowrate capacity will define the physical size of the drum. All conditions being similar the natural circulation boiler drum will be of greater volume than the forced circulation boiler. Once-through types are a different kettle of fish though.

What are the capacity/pressure and drum sizes for the ones you have come across?
Register to Reply
dhayanandhan
Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#6
In reply to #5

Re: What Are The Deciding Criterion of Boiler Drum Size?

05/21/2010 7:27 AM

Dear Mr.AussieBob,

Thank you for your reply and I shall provide the details of the drums where I happened to come across.

thanks,

dhayanandhdan.s
Register to Reply
Register to Reply
Have a Different Question?
6 comments
Copy to Clipboard

Users who posted comments:

AussieBob (2); dhayanandhan (2); ducon (1); PWSlack (1)

Previous in Forum: Tesla Earthquake Machine.   Next in Forum: Proper Threaded Pipe Joints
You might be interested in: Boiler Services, Boiler Controllers, Drum Pulleys

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (68 right now)
Show Members
Advertisement