I want to simulate a part-load operation of coal-fired power plant. I have tried to implement Stodola equation and mass and heat balances through Fortran code but got issues in the cycle convergence.
Try to simulate first of all the rated-load (nominal charge) as a particular case. If the results are good, go further.
Thank you for your answer. However, I have already developed and validated the power plant model at a nominal load. The performance is in a good agreement with the literature I am using. The problem is I do not know whether it is possible to conduct an off-design simulation using Aspen Plus directly.
Unfortunatelly, I am not familiar with Aspen Plus. I saw now that it works for chemical industry, but I didn't found anithing about simulating Rankine-Hirn cycle. Maybe it is possible to implement user-made procedures and design a new case-study. Good-luck
!
Thank you for your input! I am trying to define user functions but since the model consists of many recycle streams it is quite hard to converge it.
Sounds like you are "re-inventing the wheel". There are commercial modelling packages such as PEPSE that can do this.
Dear Raymond, thank you for your suggestion. I am aware of commercial packages such as GateCycle, CycleTempo or Ebsilon Professional which can do the work. However, I cannot use these packages to model, ie, the CO2 capture plant integration.
Nevertheless, I would like to thank everyone for contribution as I have already worked it out how to simulate the part-load performance of the power plant using Aspen Plus.
Regards,
Dawid
Dear Dr. Hanak,
I am interested to know, how did you finally proceed with your part-load analysis?
Kind regards,
Sarah
Dear Dawid,
I would advise use MATLAB instead of Fortran code for steam cycle performance.
Power plant can use couple of process simulators such as e.g. Aspen Plus, Unisim, and Pro II. . To evaluate the model’s performance, its predictions may be compared with those of an equivalent model from Gate Cycle or other cycle. Use the Steam table for steam, count enthalpy values of cycle performance, and predict the inlet temperature, mark steam deviations and efficiency range. Just assume, the relative deviations in the plant power output and efficiency must be less than 0.65% for 100% loads. Use MTALAB, it can solve your issue(Reference: Aklilu and Gilani adopted the normalized parameters from to describe the characteristics of compressor and turbine and developed a simulation model in MATLAB to identify the plant operation mode from field data. Zhang et al).
The simulation can follow the recycle modules.
The following assumptions perhaps you have made for simulating the pressure in power plant using Aspen.
1. Plant at Steady state (2) Fuel combustion (3) Cooling water flow (4) No water leak.
Refer the site:
file:///C:/Users/3020/Cookies/Desktop/Downloads/SimulatingcombinedcyclegasturbinepowerplantsinAspenHYSYS.pdf
Ashish
Dear Dawid,
I would advise use MATLAB instead of Fortran code for steam cycle performance.
Power plant can use couple of process simulators such as e.g. Aspen Plus, Unisim, and Pro II. . To evaluate the model’s performance, its predictions may be compared with those of an equivalent model from Gate Cycle or other cycle. Use the Steam table for steam, count enthalpy values of cycle performance, and predict the inlet temperature, mark steam deviations and efficiency range. Just assume, the relative deviations in the plant power output and efficiency must be less than 0.65% for 100% loads. Use MTALAB, it can solve your issue(Reference: Aklilu and Gilani adopted the normalized parameters from to describe the characteristics of compressor and turbine and developed a simulation model in MATLAB to identify the plant operation mode from field data. Zhang et al).
The simulation can follow the recycle modules.
The following assumptions perhaps you have made for simulating the pressure in power plant using Aspen.
1. Plant at Steady state (2) Fuel combustion (3) Cooling water flow (4) No water leak.
Refer the site:
file:///C:/Users/3020/Cookies/Desktop/Downloads/SimulatingcombinedcyclegasturbinepowerplantsinAspenHYSYS.pdf
Ashish
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