Drawing of an HRSG

[BlrInspectorVa]

I am looking for a good drawing that I can print out and label the areas of an HRSG--supercritical boiler with and with out drums.

 

[AllHandlesTaken]

Something like the attached?
(more a picture than a drawing, but it's a shot)

 

[eliebl]

It would be interesting to see if there is anyone who has built a supercritical HRSG.

 

[BlrInspectorVa]

Thanks AllHandsTaken, but the drawing I am looking for is a scaled version..blueprint type like the one the can be found or seen in Basics of Boiler and HRSG Design book, it was also released by B&W on the A type boiler or El-Paso type boiler.

eliebl, I have attached a link for your review.

http://www.ebook-search-engine.com/supercritical-boiler-ebook-pdf.html

Again, Thank You for the drawing you provided.

 

[rmw]

Have you looked in

http://www.hrsgdesign.com

under "types/configs"?

rmw

 

[curtis2004]

What is a "superscritical" means here?

 

[rmw]

In the context of the question asked, especially as regards a HRSG, I read the word "supercritical" to mean "once through". I could have been wrong about that, however.

rmw

 

[AllHandlesTaken]

I don't have access to "Basics of Boiler and HRSG Design book", so here is another shot in the dusk, from ABB's "Combustion Fossil Power".

 

[nhliew]

curtis & rmw, i think that supercritical means that the steam produced from the boiler is at higher pressure and/or temperature than the critical values for water.

 

[davefitz]

The once thru HRSG's are built by licensees of Siemens KWU, such as recently announced by Nooter Ericksen. One KWU style was built in England about 10 yrs ago . The HP circuit is once thru . without a steam drum, but with integral steam/water separators.( Horizontal gas pass)

Another syle once thru HRSG has been proposed by a belgian HRSG mfr ( vertical gas pass), but I do not think they have built one yet.

The most common once thru HRSG is made by a canadian mfr, called IST, uses all-incolnel tubing and very high inlet orifice pressure drop ( for flow distribution and stability), vertical gas flow.

 

[davefitz]

The IST site is at <

http://www.otsg.com>

The once thru unit built in england by KWU siemens is called "cottam"

 

[davefitz]

Traditionally, one was unlikely to have a supercritical unit if the steam turbine electric rating was below 450 MWe for 2 reasonsa) The leakage past the HP turbine seals caused a loss which exceeded the thermodynamic gain due to the higher pressure cycle if the HP turbine ( 3600 rpm) rating was below a certain size, historically judged to be 450 MWe and (b) for a coal fired radiant furnace, it was difficult to achieve the required mass flowrate thru the furnace waterwall tubes for ratings below 450 MWe.

In the case of a gas fired combined cycle, item (b) is irrelevant, but it may be possible to overcome the steam turbine leakage issue by using a sepeate shaft for the HP turbine with a gear reducer or separate HP generator or a digital conversion to 60 Hz ( as used with small capstone gas turbines).

 

[BlrInspectorVa]

Supercritcal: As previously stated it is a once through, meaning what comes in goes out, there is a steam drum, but may or may not have a mud/water drum, the steam is generated within the water wall tubes. The SC boiler operates up to 4500 psig.

 

[BlrInspectorVa]

Here is a type of drawing am loking for this is a subcritical boiler coal fire

 

[davefitz]

There seems to be some confusion in this series.

a) The dwgs that were listed are not HRSG's; they were fossil fired steam generators with radiant furnaces

b) the boiler shown was an older design subcritical once thru unit; there is no steam drum, but there may be a low pressure flash tank for startup in the old design that was shown.

c) I suggest you find a the latest editio of BW "Steam" and obtain the required dwgs for all the differnt styles of boilers + steam generators from that source.

 

[BlrInspectorVa]

There is a steam drum on the boiler picture I provided, two reason I know for sure:

1) it is in the drawing

2) I have crawled through it, the steam drum that is, not to mention the two mud drums that is installed.

The latest addition of "Steam": "Reprint of the 1927 edition
This is a rare reprint and should not be confused with the 1992 40th edition, or the upcoming (2005) 41st edition. This is the 36th edition from 1927 and the reprint is not a publication of Babcock & Wilcox."

as per Amazon.com you can even review the book there.

 

[athomas236]

My understanding is that all supercritical HRSG stages are once through but not all once through HRSG stages are supercritical.

I have worked on two projects on the latter type.

Regards,

athomas236

 

[rmw]

I think the reference to 'water wall tubes' indicates a state of confusion regarding the meaning of the terminology.

rmw