Thermodynamics Regenerative Rankine Cycle

[Kamuna]

Summary:: regenerative rankine cycle

Im a bit troubled by my home activity recently and maybe i could use some help this is the problem :

In a steam power plant operating on regenerative Rankine cycle with one contact feedwater heater, steam enters the turbine at 8.0 MPa, 350 C and condensed in the condenser with a pressure at saturated temperature of 40 C. Some steam is bled at 700 kPa for feedwater heating. There are 27.5 kg/s of steam entering the high-pressure turbine, determine:

a. extracted steam flow per second
b. turbine work output in kW
c. thermal efficiency of the cycle
( Home Activity : If the extraction of steam is at 1.2 MPa , determine a b, & c)

My question is what is the meaning of the extraction of steam and where would i use the 1.2Mpa or should i change a variable in the given problem to 1.2Mpa? Thanks in advance

 

[BvU]

what is the meaning of the extraction of steam

extraction of steam is the opening of the valve between boiler and turbine, I would say.
Am I right in understanding this exercise was done (in class, or otherwise) with extraction at 8 MPa and now you are asked to do the same exercise at 1.2 MPa ?

 

[Kamuna]

extraction of steam is the opening of the valve between boiler and turbine, I would say.
Am I right in understanding this exercise was done (in class, or otherwise) with extraction at 8 MPa and now you are asked to do the same exercise at 1.2 MPa ?

Is this the same question as https://www.physicsforums.com/threads/regenerative-rankine-cycle.1013703/ ?

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the 8Mpa has a solution already but our home activity was if the extraction is 1.2Mpa. So I just need to replace the 8Mpa into 1.2Mpa? I am still a bit confused in the topic so i don't know what extraction of steam means and still don't know where to replace the given

 

[BvU]

dont know what extraction of steam means

Extraction, translated literally, means: removal (the taking out) from ex (out) and traction (pulling).

I wrongly said 'between boiler and turbine': it can just as well be between a turbine stage and the feed water heater.
(And must humbly admit that that is the more sensible exercise: with 12 Bar instead of 7 Bar)

Do you have a flowchart of your process at 80 Bar ? Does it look like https://www.electrical4u.com/rankine-cycle-and-re-generative-feed-heating/#:~:text=In%20a%20Rankine%20regenerative%20cycle,)%2C%20where%20it%20is%20extracted. ?

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[Kamuna]

Extraction, translated literally, means: removal (the taking out) from ex (out) and traction (pulling).

I wrongly said 'between boiler and turbine': it can just as well be between a turbine stage and the feed water heater.
(And must humbly admit that that is the more sensible exercise: with 12 Bar instead of 7 Bar)

Do you have a flowchart of your process at 80 Bar ? Does it look like https://www.electrical4u.com/rankine-cycle-and-re-generative-feed-heating/#:~:text=In%20a%20Rankine%20regenerative%20cycle,)%2C%20where%20it%20is%20extracted. ?

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yep, it looked like that and thanks anyway I've already solved it it's just that the 700kpa needs to be replaced with 1.2Mpa and now I'm good so thanks again for helping me