scholarly journals Analysis of the complementary energy losses of a high temperature gas to gas heat exchanger based on a solid intermediate medium

2012 ◽  
Author(s):  
L. A. Catalano ◽  
R. Amirante ◽  
P. Tamburrano ◽  
S. Copertino
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Energy Losses ◽  
Complementary Energy ◽  
Intermediate Medium ◽  
High Temperature Gas

Active Chemistry Control for Coolant Helium Applying High-Temperature Gas-Cooled Reactors

2008 ◽  
Author(s):  
Nariaki Sakaba ◽  
Shimpei Hamamoto ◽  
Yoichi Takeda
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchanger ◽  
Chemical Composition ◽  
Structural Integrity ◽  
Carbon Deposition ◽  
Control Technology ◽  
Equilibrium Study ◽  
Intermediate Heat Exchanger ◽  
High Temperature Gas

Lifetime extension of high-temperature equipment such as the intermediate heat exchanger of high-temperature gas-cooled reactors (HTGRs) is important from the economical point of view. Since the replacing cost will cause the increasing of the running cost, it is important to reduce replacing times of the high-cost primary equipment during assumed reactor lifetime. In the past, helium chemistry has been controlled by the passive chemistry control technology in which chemical impurity in the coolant helium is removed as low concentration as possible, as does Japan’s HTTR. Although the lifetime of high-temperature equipment almost depends upon the chemistry conditions in the coolant helium, it is necessary to establish an active chemistry control technology to maintain adequate chemical conditions. In this study, carbon deposition which could occur at the surface of the heat transfer tubes of the intermediate heat exchanger and decarburization of the high-temperature material of Hastelloy XR used at the heat transfer tubes were evaluated by referring the actual chemistry data obtained by the HTTR. The chemical equilibrium study contributed to clarify the algorism of the chemistry behaviours to be controlled. The created algorism is planned to be added to the instrumentation system of the helium purification systems. In addition, the chemical composition to be maintained during the reactor operation was proposed by evaluating not only core graphite oxidation but also carbon deposition and decarburization. It was identified when the chemical composition could not keep adequately, injection of 10 ppm carbon monoxide could effectively control the chemical composition to the designated stable area where the high-temperature materials could keep their structural integrity beyond the assumed duration. The proposed active chemistry control technology is expected to contribute economically to the purification systems of the future very high-temperature reactors.

scholarly journals Development of Plate-Fin Heat Exchanger for Intermediate Heat Exchanger of High-Temperature Gas Cooled Reactor

2010 ◽  
Vol 9 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Yorikata MIZOKAMI ◽  
Toshihide IGARI ◽  
Keiichi NAKASHIMA ◽  
Fumiko KAWASHIMA ◽  
Noriyuki SAKAKIBARA ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Intermediate Heat Exchanger ◽  
High Temperature Gas

Oxide Layers Mechanical Properties for Ni Base Alloys in HTR Environment

2008 ◽  
Vol 595-598 ◽  
pp. 501-509
Author(s):  
Damien Kaczorowski ◽  
Gouenou Girardin ◽  
S. Chamousset
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Heat Exchanger ◽  
Tensile Test ◽  
Oxide Layers ◽  
Intermediate Heat Exchanger ◽  
Nickel Base ◽  
Very High ◽  
High Temperature Gas

Nickel base alloys 617 and 230 are promising candidates for the Intermediate Heat eXchanger (IHX) of GenIV Very High Temperature gas cooled Reactors. The capability to maintain an oxide layer as an efficient barrier against corrosion under mechanical loading is investigated through SEM in situ tensile test. The mechanical properties of external oxide layers are so compared between the two alloys. Cracks and spallation are observed. Few differences could be observed between these two alloys when pre oxidized in impure helium.

Thermal hydraulic study on a high-temperature gas–gas heat exchanger with helically coiled tube bundles

1998 ◽  
Vol 185 (2-3) ◽  
pp. 141-151 ◽  
Author(s):  
Yoshiyuki Inagaki ◽  
Hiroshi Koiso ◽  
Hideki Takumi ◽  
Ikuo Ioka ◽  
Yoshiaki Miyamoto
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Coiled Tube ◽  
Helically Coiled Tube ◽  
Tube Bundles ◽  
High Temperature Gas
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