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구형 촉매가 삽입된 공정열교환기 유동채널의 압력강하 실험
홍성덕(Sung Deok Hong),서동운(Dong Un Seo),김찬수(Chan Soo Kim),김민환(Min Hwan Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
A process heat exchanger (PHE) provides an interface between the nuclear heat and the hydrogen production process. The SO3 gas is heated and decomposed into SO2 and O2 in the PHE. The SO3 flow channels have enough space to be filled with 1-4mm diameter catalysts. we carried out the pressure drop experiments on a flow channel filled with ball shaped catalysts. The test section simulates a single channel of the PHE secondary side plate-fin channel. The experimental results compared well with the known pressure drop correlations and a numerical analysis, respectively.
홍성덕(Sung Deok Hong),김신엽(Sin Yeob Kim),강경준(Kyung Jun Kang),박병하,김찬수(Chan Soo Kim),Hong Sik Lim 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Hydrogen production efficiency using High Temperature Steam Electrolysis (HTSE) improves as the temperature of the supplied steam increases. A Lab-scale HTSE system is now under constructing at the Korea Atomic Energy Research Institute. An experiment facility to generate high-temperature steam of 820℃ is designed and constructed for 30㎾ HTSE using solid-oxide electrolyte cell stacks. The experiment facility equipped a 77㎾ heating system to heat the helium up to 950℃, and a Multi-stream heat exchanger (MHX) is designed and manufactured to heat the steam and air up to 800℃ with the heated helium. To control the mass flow rate and pressure of superheated steam into the MHX, shell and helical-tube type steam generator with core tank is separately designed. Pressurized pure water at a constant flow rate is injected into the shell side of the steam generator, and helium from the MHX passes through the tube side of steam generator. In this study, the stable generation of both superheated steam of 15.4 ㎏/hr at 805℃ and air of 11.5 ㎏/hr at 761℃ are tested through the helium heated steam/air supply system.
Experimental Apparatus to Study the Adsorption Behavior of Metals on Reactor Components
Sung-Deok Hong(홍성덕),Nam-il Tak(탁남일),Byung-Ha Park(박병하),Eung-Seon Kim(김응선),Min-Hwan Kim(김민환) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Metallic fission product (FP), such as silver, cesium, and strontium, can be released from defected nuclear fuel of high temperature gas-cooled reactor (HTGR). These metals may subsequently diffuse from the fuel, become plate-out on the internal walls of primary components, leading to the introduction of radioactive impurities into many components of the reactor. Each material, each FP and each of its compound form have different kinetics and so, potentially, very large number of experiments are necessary. It should be understood that the empirical knowledge of FP alloy interactions makes no distinction between the different adsorption/absorption/reaction mechanisms. KAERI prepare a lab-scale apparatus to study plate-out characteristics of metallic FP. The apparatus is an out-of-pile test device and is able to simulate HTGR core temperature at helium flow condition or argon flow condition. The apparatus is an open loop that composed of a gas supply system, a preheater, a FP heater, a test section, an air cooler and two kind of filters. We invented multi-couponed tube type test section(MCTS) to get many test coupons with various temperature conditions. It is confirmed from a strontium metal test. Strontium in the crucible is entrained by argon gas flow and plated out on the MCTS successfully during 6.0 hours 900 ℃ steady-state operation of the experimental apparatus.
초고온가스로용 대용량 헬륨가스순환기에 대한 자기베어링 기술 적용성 평가
홍성덕(Sung Deok Hong),김민환(Min Hwan Kim),정명관(Myung Kwan Jung),박승기(Seung Gi Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The Helium circulator is a unique high speed rotating component in the Very High Temperature gas-cooled Reactor(VHTR) which is a candidated nuclear reactor for hydrogen production. Control of gaseous impurities in the VHTR is a significant operating requirement. The oil vapor induced by a circulator will contaminate and damage the sophisticated high temperature components composed of Graphite material. Therefore, Helium circulator needs an elimination of the oil systems required by traditional bearing designs. An oil less magnetic bearing circulator could meet the requirement for VHTR, because the control object in the magnetic bearing system enables the rotor to rotate without any physical contact by using magnetic force. We study the status of magnetic bearing technology and pick out possible problem when the large size helium circulator adapted the magnetic bearing as his bearing system.
용접물성치를 고려한 소형 공정열교환기 시제품의 고온구조해석
송기남,홍성덕,박홍윤,Song, Kee-Nam,Hong, Sung-Deok,Park, Hong-Yoon 한국압력기기공학회 2012 한국압력기기공학회 논문집 Vol.8 No.2
A PHE (Process Heat Exchanger) in a nuclear hydrogen system is a key component required to transfer heat energy of $950^{\circ}C$ generated in a VHTR (Very High Temperature gas cooled Reactor) to the chemical reaction that yields a large quantity of hydrogen. A small-scale PHE prototype made of Hastelloy-X is being tested in a small-scale gas loop at Korea Atomic Energy Research Institute. Previous research on the high-temperature structural analysis of the small-scale PHE prototype had been performed only using parent material properties. In this study, high-temperature structural analysis using weld properties in weld zone was performed and the analysis results compared with the previous research.
계장화 압입시험법에 의한 SUS316L판의 용접부 기계적 물성치 측정
송기남,홍성덕,노동성,Song, Kee-Nam,Hong, Sung-Deok,Ro, Dong-Seong 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.2
Different microstructures in the weld zone of a metal structure such as a fusion zone or heat affected zone are formed as compared to the parent material. Thus, the mechanical properties in the weld zone are different from those in the parent material. As the basic data for reliably understanding the structural characteristics of welded PCHE prototype made of SUS316L, the mechanical properties in the weld zone and parent material for a SUS316L plate are measured using an the instrumented indentation technique in this study.