Sign up Calendar Latest Topics Donate
 
 
 


Reply
  Author   Comment  
OLi

Sr. Member
Registered:
Posts: 1,918
Reply with quote  #1 
O1 was shut today and will not start again. It was a plant that we followed for the full cycle and having a single counter rotating radial dual generator turbine with axial stages it was a special and AFAIK the largest of it's kind and unique. Specially my father spent many weeks making it work and there are a few stories around that. It operated from 1972 482MW. It took them 6 years to build a plant those days. After a 2nd and 3d upgrade 1998-2002 it had reduced availablity for various reasons but was recovering lately and now regulations would likely require more upgrades so it was no longer evaluated as cost effective. 2004 it peaked at producing 3,5TWh, not so bad. I made the sensors and converters that monitored it the last 15 years and it had our vectormonitor Vibroflex from start. It was planned to run a couple of weeks more but tripped the last time today. Rest in peace you unique piece of machinery. The 2nd in size turbine of that design is already scrapped as it was used in a nuke that never was started and converted to a oil fuel spare unit, only similar was in the Netherlands, do not know the fate of that. 3d in size of that turbine design are in a spare oil fuel plant that no longer is paid to be in standby.
__________________
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
electricpete

Sr. Member
Registered:
Posts: 651
Reply with quote  #2 
I had to look it up, I think you're talking about Oskarshamn
https://en.wikipedia.org/wiki/Oskarshamn_Nuclear_Power_Plant
OLi

Sr. Member
Registered:
Posts: 1,918
Reply with quote  #3 

Yes, correct, Oskarshamn O1 is the first unit actually the first commercial nuke in Sweden they write, that is somewhat true, we had a combined municipal heatplant and electrical generation plant earlier but it was sort of governement and heavy water design. http://www.okg.se/en/About-OKG/Facilities/Oskarshamn-1/

O2 the second unit is already stopped and waiting to be taken apart after a unfinished upgrade project.

Barsebäck site having 2x ABB BWR units are now staring to be seriously stripped, cutting the tanks in to pieces since it was the first large site to shut down after the early experimental units.

Actually Ringhals R1 was supposed to be first but since they found a couple of GEC turbines cheap unused second hand in a warehouse in Korea. It was somewhat delayed and testrun with steam from a a used Navy destroyer etc. I remember sneaking in thru the rotating door with my father to have a look before it was started, little knowing that I actually would work there later, that is next in turn to be shut down and scrapped not so far away in 2020. It is 2x365MW upgraded to 2x429MW axial flow turbines and so far the largest machine I put balancing weights in on site, and it improved.... We also added a few hundred kilo iron on the RCP's that is of a funny push in type hanging in the vessel with a slight resonance problem that did run for some 40+ years after that adjustment.....
These are all ABB that is now circle W that is now Toshiba? BWR units.

Ringhals site also have 3 pcs of classic circle W PWR units, the first R2 will be shut down a year or so after R1. It was started a year before R1.

Radial flow counter rotating turbines are 5% more efficient than axial flow! Go Radial[biggrin]


__________________
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
John from PA

Sr. Member
Registered:
Posts: 963
Reply with quote  #4 
Oli, can you elaborate on the counter rotating part? I of course know what counter rotating means, just having problems understanding what is counter rotating in a 400+ Mw steam turbine generator.
OLi

Sr. Member
Registered:
Posts: 1,918
Reply with quote  #5 

Well, consider what we call a squirrel cage, than take 2pcs, overhung and stuck in to each other.....

Rotating 300RPM each direction, you be careful when balancing as some not so far back was informed upon by reality.
Some picture a bit down, not so good but this design is almost vanished in history,
https://en.wikipedia.org/wiki/Fredrik_Ljungstr%C3%B6m


find here a clearer sketch:

https://commons.wikimedia.org/wiki/File:Ljungstr%C3%B6m_turbine_principle.png


So entering steam in the center and having 2 overhung rotors, stucked inside each other, that for balancing act as 1 unit almost despite they rotoate opposite directions......

In summary it makes the design to avoid resonance at 3000RPM and being a bit careful when adding weights. It do have a eddy probe in the steam to monitor

the bending and system clearance and when that die due to the environment operation is more difficult....... Clearance is 0.1mm or less on all stages, consider producing such things in the early 1900 when they started. I am still impressed and naturally as they were made in the town where I was born it does add to that, they had a complete factory floor full with manual lathes and the computer was another floor full with people operating adding machines to do the calculations and since there was no ready made material to order from stock a full material lab with funny machines testing materials did complete the scenery. I saw the material lab when having summer job in the lab but it's long gone now and I never saw the calculation room it was already gone but the workshop was still operating at that time, now it is a office space. Inventor and in some way developer Mr. Ljungström died destitute I think the term is 1960 after a total of like 122 patents and I had some problems finding a description that did make a view of the workings understandable so it is slowly sinking down in the mud of history in only like 100 years.....
I still think it is a beautiful design. I might 3D print one then it will be around another few years.

I found this describing the upgrade I didn't know of before that include some pictures, https://www.yumpu.com/en/document/view/248935/han-hamer-sulzer-turbo-services-repairing-and-performing

Obviously info was lost on the design during the takeover frenzy so it was rebuilt, reverse engineered and later destroyed during balancing (no fingers of mine involved) and a rotor set was about 2M Euro some years ago.


So what people do to avoid patent and get a compact in theory 10% more efficient device.


__________________
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.