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Actually both the HYSYS and ASPEN PLUS computer codes gave the same results for cases we investigated. However, HYSYS has more capabilities than those for Aspen Plus. If more complicated chemical processes are involved, Aspen Plus can be a better code. However, when it is applied to no chemical reaction application with polytropic compression and expansion, HYSYS is a slightly better code with more characteristic turbine curves. INEEL has had company wide licenses for both computer codes. Therefore, we can use Aspen Pus code for other application such as hydrogen production plant. Task 1-4 Layout of the CO2 thermal cycle and initial calculations The objective of this task is to create a preliminary layout of a CO2 thermal cycle as a baseline case for comparing with the helium cycle. Task technical status overview: As reported in the first annual report the following tasks were already accomplished through the end of September 2002. Task 1-5 Perform baseline calculations along with Task 1-4 The objective of this task is to establish a baseline case and to use the baseline case as a basis for comparing its results with those from other cycle efficiency calculations using other cycle configurations and various working fluids. Task technical status overview: This task was completed in June 2003. Task 2. Improvement of Pebble Bed Reactor (PBR) Net Efficiency Task 2-1 Parametric study due to enhancement of each component’s efficiency The objective of this task is to determine the overall plant busbar efficiency by the combination of the increased efficiency of each component in the secondary side of the HTGR. To accomplish this task, we performed a parametric study of the effect of each component on the overall Brayton cycle efficiency. Important parameters for improving the Brayton cycle efficiency are increasing the reactor core outlet temperature, increasing the efficiencies of the compressor, turbine, intermediate heat exchanger, and others. The reactor core outlet temperature was varied between 850 C and 1000 C. For each of the fixed outlet temperatures (850 C, 900 C, 950 C and 1000 C), the inlet temperature to the core was varied between 400 C and 640 C. All of the above cases are based on a three shaft arrangement for the helium Brayton cycle, using an intermediate heat exchanger effectiveness factor of 92 %, a 90 % polytropic efficiency for the compressors and turbines, and a 300C cooling temperature to the precooler and the three intercoolers. The mass flow rate through the core needed to remove 250 MW of thermal energy from the reactor core is a function of the required temperature drop across the core. Thus, the pressure drop across the core is a function of the core mass flow rate. Previously we did not account for the effect of the pressure drop on the Brayton cycle efficiency. For these calculations, we used a pressure drop equation shown below that is based on a pebble bed reactor. 2PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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