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- 저자 : Javad Hosseinpour (검색결과 2 건)
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Analysis and design of centrifugal compressor for 10 MWe supercritical CO2 Brayton cycles
Javad Hosseinpour,Mekuannint Messele,ABRAHAM ENGEDA 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5
The concept of a closed-loop s-CO 2 Brayton cycle is highly attractive and promising; however, there is yet a major hurdle to overcome, namely, the designing, developing, and testing of a reasonable size (10 MWe or higher) prototype of an s-CO 2 Brayton-cycle-based power gas turbine. In the present paper, two well-known closed-loop s-CO 2 Brayton cycles, the simple recuperated and recompression cycles, were reconfigured to generate 10 MW electric power. It was found that the thermal efficiency of simple and recompression cycle was 43.2 %, and 54.2 %, respectively. Further, a 1-D compressor design code was developed by avoiding condensation margin and the Widom region and validated with Eckardt Impeller-A to proceed and design a single-stage s-CO 2 impeller for the simple recuperated power cycle. The results show that the diffusion rate along the blades (W 2 /W 1 ) is fairly high for the designed compressor. Additionally, blade angle distribution and the performance plots were computed by utilizing the developed code and presented for the simple recuperated cycle. Lastly, the 3-D impeller was generated and CFD analysis was performed and the results are reported.
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Seyed Javad Ahmadi,Neda Akbari,Zahra Shiri-Yekta,Mohammad Hossein Mashhadizadeh,Morteza Hosseinpour 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
This study focuses mainly on the synthesis of MnO2-ZrO2 nano-composite as a new inorganic adsorbent. Supercritical water was used as a preparation medium for particle deposited materials. MnO2-ZrO2 was prepared frommetal nitrate solutions in supercritical region. The resulting sample was characterized by Fourier transform infrared(FTIR), X-ray fluorescence (XRF), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and transmissionelectron microscope (TEM). Analyses of the TEM images show the possibility for crystallizing nano-sized particles. The synthesized adsorbent was then used for the removal of strontium(II) from the nuclear waste. Moreover, anumber of factors such as aqueous phase pH, contact time and initial metal ions concentration in the adsorption processwere investigated. Comparison of the adsorption efficiency of the MnO2-ZrO2 nano-particles with those of thenon-nano particles shows a shift of uptake of the metal ions vs. pH curves towards lower pH values and a significantimprovement in adsorption of strontium ions was observed by using the nano-adsorbent. The kinetic data correspondswell to the pseudo-second-order equation. The adsorption data for strontium(II) were well fitted by the Langmuir isotherm. The synthesized nano-composite also showed a strong affinity toward the removal of Y(III), Ni(II), Pb(II) andCo(II) from the nuclear radioactive waste.
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