• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.3 no.3
• /
• pp.60-67
• /
• 1989

본 논문에서는 열병합발전소로서 가스터빈을 이용하는 경우, 계통분리를 비롯한 각종고장에 따른 발전기 및 계통의 응답성을 검토하여 가스터빈의 운전방법 및 계통의 안전운전여부를 파악할수 있는 방법에 대하여 검토하였다. 특히 온도제어루프, 가속도제어루프를 비롯한 가스터빈의 제어루프와 Droop 및 등속도 운전과 같은 운전방법을 시뮬레이션에 포함하여 각종 사례연구를 통하여 열병합발전소의 적절한 운전방법을 연구하였다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.10
• /
• pp.1455-1462
• /
• 2010

PHE (Process Heat Exchanger) is a key component required to transfer heat energy of $950^{\circ}C$ generated in a VHTR (Very High Temperature Reactor) to the chemical reaction that yields a large quantity of hydrogen. Korea Atomic Energy Research Institute established the helium gas loop for the performance test of components, which are used in the VHTR, and they manufactured a PHE prototype to be tested in the loop. In this study, as part of the hightemperature structural-integrity evaluation of the PHE prototype, which is scheduled to be tested in the helium gas loop, we carried out high-temperature structural-analysis modeling, thermal analysis, and thermal expansion analysis of the PHE prototype. The results obtained in this study will be used to design the performance test setup for the PHE prototype.

• Journal of the Korean Institute of Gas
• /
• v.9 no.1 s.26
• /
• pp.33-37
• /
• 2005

This paper deals with parametric studies for the structural response of LNG Storage Tank steel roof behavior acoording to change in design condition. In the design of steel roof, it may be required to represent a stable behavior under many loading conditions and those of combinations. We fulfill the analysis the steel roof behavior during concret placing and additionally change the design variabls like H beam, pressure and steel roof plate thickness. On the basis of the obtained results from this studies a guideline for a more reasonable design of LNG storage tank steel roof is introduced.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.35 no.2
• /
• pp.191-200
• /
• 2011

A PHE (Process Heat Exchanger) is a key component of nuclear hydrogen system for massive production of hydrogen; the PHE transfers the very high temperature heat ($950^{\circ}C$) generated from the VHTR (Very High Temperature Reactor) to a chemical reaction. The Korea Atomic Energy Research Institute developed a small-scale gas loop for testing the performance of VHTR components and manufactured a modified PHE prototype for carrying out the testing in the gas loop. In this study, as a part of the evaluation of the high-temperature structural integrity of the modified PHE prototype which is scheduled to test in the gas loop, we carried out high-temperature structural analysis modeling, macroscopic thermal and structural analysis of the PHE prototype under the gas loop test conditions as a precedent study before carrying out the performance test in the gas loop. The results obtained in this study will be used to design the performance test setup for the modified PHE prototype.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.36 no.10
• /
• pp.1283-1288
• /
• 2012

A process heat exchanger (PHE) in a nuclear hydrogen system is a key component for transferring the considerable heat generated in a very high temperature reactor (VHTR) to a chemical reaction that yields a large quantity of hydrogen. A performance test on a medium-scale PHE prototype made of $Hastelloy^{(R)}$-X is scheduled in a small-scale gas loop at the Korea Atomic Energy Research Institute. In this study, as a preliminary study before carrying out the performance test in the gas loop, high-temperature structural analysis modeling and macroscopic thermal and structural analysis of the medium-scale PHE prototype by imposing the established displacement boundary constraints were carried out under the gas loop test condition. The results obtained in this study will be compared with the performance test results of the medium-scale PHE prototype in the gas loop.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.35 no.10
• /
• pp.1249-1255
• /
• 2011

A PHE (Process Heat Exchanger) is a key component required to transfer heat energy of $950^{\circ}C$ generated in a VHTR (Very High Temperature Reactor) to a chemical reaction that yields a large quantity of hydrogen. A small-scale PHE prototype made of Hastelloy-X was scheduled for testing in a small-scale gas loop at the Korea Atomic Energy Research Institute. In this study, as a part of the evaluation of the high-temperature structural integrity of the PHE prototype, high-temperature structural analysis modeling, and macroscopic thermal and elastic-plastic structural analysis of the PHE prototype were carried out under the gas-loop test conditions as a preliminary qwer123$study before carrying out the performance test in the gas loop. The results obtained in this study will be used to design the performance test setup for the modified PHE prototype.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.9
• /
• pp.1241-1248
• /
• 2010

In large-scale production of hydrogen, a PHE (Process Heat Exchanger) is a key component because the heat required to carry out the Sulfur-Iodine chemical reaction that yields hydrogen is transferred from a VHTR (Very High Temperature Reactor) by the PHE. Korea Atomic Energy Research Institute established a helium gas loop for conducting performance test of components that are used in the VHTR. In this study, as a part of high-temperature structural-integrity evaluation of a designed PHE prototype that is scheduled to be tested in the helium gas loop, we carried out high-temperature structural-analysis modeling, thermal analysis, and thermal-expansion analysis for the designed PHE prototype. An appropriate constraint condition is proposed at the end of the in-flow and out-flow pipelines of the primary and secondary coolants and the proposed constraint condition will be applied to the design of the performance-test loop setup for the designed PHE prototype.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.13 no.3
• /
• pp.490-499
• /
• 1989

These days the closed cycle gas turbine attracts considerable attention due to : (1) The possibility of directly coupling the closed cycle gas turbine with a high temperature gas cooled reactor ; (2) the economical use of dry coolers to reduce the thermal charge of the environment ; and (3) the reduction of pollution and energy consumption, by replacing the domestic hearth by a central heating and power station. In this paper, we selected the optimal cycle from the characteristic of thermodynamic cycle for the optimal design of closed CO$_{2}$ gas turbine cycle usuable in nuclear energy power plant. Also the effects of between the parameters and thermal efficiency were investigated by computer simulation. These results and design data will be added to basics in optimal designing closed CO$_{2}$ cycle gas turbine plant.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2010.10a
• /
• pp.135-136
• /
• 2010

• Journal of the Korean Institute of Gas
• /
• v.14 no.5
• /
• pp.7-12
• /
• 2010

This paper presents FE analysis on the stress and displacement behavior safeties of dome roof structures for a LNG outer tank, which is constructed by sets of H beams and reinforced concrete. The excitation force of 0.2g is applied at the center of the bottom concrete structure of an outer tank. The computed FEM results indicated that the maximum von Mises stress was shown at the edge of dome roof structure and the maximum displacement was produced at the center of dome roof. The results showed that the concentrated stress and displacement were steadily increased for an increased number of H beams. This means that the number of H beams does not critically affect to the safety of the dome roof structure because the stiffness of a reinforced concrete structure is much higher than that of H beams. Thus, the number of H beams may be restricted under 60 due to a dead weight of H beams for 0.2g excitation force.