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PostPosted: Oct 28, 2013 9:43 pm 
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Joined: Dec 14, 2006 1:01 pm
Posts: 380
Have you guys seen GE's philosophy of gas turbine design?
http://site.ge-energy.com/prod_serv/products/tech_docs/en/downloads/ger3434d.pdf

Probably the right way to do this is not to compete with them, but buy turbines from them.
The trick with that is to persuade them that a Brayton cycle for LFTRs is a real business.


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PostPosted: Oct 29, 2013 10:24 am 
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Joined: Jul 14, 2008 3:12 pm
Posts: 5058
rgvandewalker wrote:
Have you guys seen GE's philosophy of gas turbine design?
http://site.ge-energy.com/prod_serv/products/tech_docs/en/downloads/ger3434d.pdf

Probably the right way to do this is not to compete with them, but buy turbines from them.
The trick with that is to persuade them that a Brayton cycle for LFTRs is a real business.


GE also sells steam turbines.


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PostPosted: Nov 05, 2013 12:41 am 
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Joined: Mar 16, 2010 1:48 am
Posts: 68
Location: Guangdong, China
How to deternmine the operation temperature ? Differernt MSR has different temperature, various from 566 degree to 700 degree. What is the biggest limit for core operation temperature?


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PostPosted: Nov 05, 2013 5:21 am 
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Joined: Jul 14, 2008 3:12 pm
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longwei1221 wrote:
How to deternmine the operation temperature ? Differernt MSR has different temperature, various from 566 degree to 700 degree. What is the biggest limit for core operation temperature?


An apparently simple design question but in reality a surprisingly complex situation.

The temperature depends on many different factors. There are so many different requirements.
-Freeze protection. Higher margin to freezing is attractive, but increases temperature relates issues (weaker material strength etc.).
- thermal stresses. Lower delta T, especially lower delta across the HX walls reduces thermal stresses.
- pump power. Higher delta T across the core means a lower pump power.
- solubility driven corrosion. Gets worse with higher delta T for most alloys of construction.
- power cycle or process heat demand. With Brayton there is more incentive for higher temperature delivery, so that means smaller delta T across HXs. But that means bigger HXs, all things being equal, or much higher pump power and related hydraulic stresses and such.
- many other factors (no time to discuss right now).

A balance must be found between the different factors. The balance will be different for different reactor layouts, type of fuel/coolant salts, steam/gas cycle, etc.


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PostPosted: Nov 05, 2013 10:04 pm 
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Joined: Mar 16, 2010 1:48 am
Posts: 68
Location: Guangdong, China
Cyril R wrote:
longwei1221 wrote:
How to deternmine the operation temperature ? Differernt MSR has different temperature, various from 566 degree to 700 degree. What is the biggest limit for core operation temperature?


An apparently simple design question but in reality a surprisingly complex situation.

The temperature depends on many different factors. There are so many different requirements.
-Freeze protection. Higher margin to freezing is attractive, but increases temperature relates issues (weaker material strength etc.).
- thermal stresses. Lower delta T, especially lower delta across the HX walls reduces thermal stresses.
- pump power. Higher delta T across the core means a lower pump power.
- solubility driven corrosion. Gets worse with higher delta T for most alloys of construction.
- power cycle or process heat demand. With Brayton there is more incentive for higher temperature delivery, so that means smaller delta T across HXs. But that means bigger HXs, all things being equal, or much higher pump power and related hydraulic stresses and such.
- many other factors (no time to discuss right now).

A balance must be found between the different factors. The balance will be different for different reactor layouts, type of fuel/coolant salts, steam/gas cycle, etc.



Cyril R, thank you! I found the temperature limit for MSRE is from bump and heatexchanger(704 degree, ORNL-TM-0732), this is important.


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