Feasibility of Lead Fast Reactor Heat Exchanger Tube Online Monitoring

2021 ◽  
Author(s):  
S. W. Glass ◽  
M. S. Good ◽  
E. H. Hirt
Keyword(s):  
Heat Exchanger ◽  
Molten Salt ◽  
Fast Reactor ◽  
Heat Exchangers ◽  
Management Approach ◽  
Corrosion Monitoring ◽  
Heat Exchanger Tube ◽  
Torsional Mode ◽  
Higher Temperature ◽  
Exchanger Tube

Abstract Online structural health corrosion monitoring in advanced lead fast reactor heat exchangers and molten salt reactor heat exchangers is desirable for detecting tube degradation prior to leaks that may allow mixing of heat exchanger fluids or release of radiological contamination beyond the design containment boundary. This program demonstrates feasibility for a torsional mode sensor to attach to the outside of a long (30-m) heat-exchanger tube in the stagnant flow area where the tube joins the heat-exchanger plenum and where it is possible to protect a sensor and cable from high-force flows. The sensor must be connected by a cable to a monitoring instrument near the heat exchanger. The sensor and cable management approach will be impractical to implement on existing heat exchangers; rather, sensors must be installed in conjunction with heat exchanger fabrication. Previous work has shown the ability of low-temperature lead zirconate titanate (PZT) piezoceramic sensors to detect anomalies of interest in 3-m tubes. These sensors have subsequently been extended to a 30-m tube more representative of commercial power heat exchanger designs. The program will continue to investigate higher-temperature piezoelectric ceramics and long-term performance of high-temperature adhesives and sealants for 350 C lead reactor environments and higher-temperature (700 °C) molten salt environments.

Feasibility of Molten Salt Reactor Heat Exchanger On-Line Monitoring

2021 ◽  
pp. 1-5
Author(s):  
Samuel W. Glass ◽  
Morris Good ◽  
Ericka Forsi ◽  
Robert Montgomery
Keyword(s):  
Heat Exchanger ◽  
Molten Salt ◽  
Heat Exchangers ◽  
Wave Mode ◽  
Management Approach ◽  
Corrosion Monitoring ◽  
Molten Salt Reactor ◽  
Flat Bottom ◽  
Flow Area ◽  
On Line

Abstract On-line structural health corrosion monitoring in advanced molten salt reactor heat exchangers is desirable for detecting tube degradation prior to leaks that either would cause mixing of heat exchanger fluids or release of radiologically contaminated fluids beyond the design containment boundary. This program seeks to demonstrate feasibility for a torsional wave mode sensor to attach to the outside of a long (30-m) heat exchanger tube in the stagnant flow area where the tube joins the heat exchanger plenum and where it is possible to protect a sensor cable from high-force flow connecting through a heat exchanger shell to a monitoring instrument. The envisioned sensor and cable management approach will be impractical to implement on existing heat exchangers; rather sensors must be installed in conjunction with the heat exchanger fabrication. Initially, flaw surrogates of interest (50% notch and 50% flat bottom hole) have been detected in a 3-m tube using low-temperature PZT piezoelectric crystals. The transducer consisted of multiple shear elements placed circumferentially around a tube. The program will continue to investigate higher temperature piezoelectric ceramics, long-term performance of high temperature adhesives, and flaw sensitivity on long (30-m +) tubes.

scholarly journals Horizontal earth-air heat exchanger for preheating external air in the mechanical ventilation system

2018 ◽  
Vol 13 (1) ◽  
pp. 71-76
Author(s):  
Vasyl Zhelykh ◽  
Olena Savchenko ◽  
Vadym Matusevych
Keyword(s):  
Heat Transfer ◽  
Mechanical Ventilation ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Convective Heat Transfer Coefficient ◽  
Ventilation System ◽  
Heat Pipes ◽  
Heat Exchanger Tube ◽  
Exchanger Tube

Abstract To save traditional energy sources in mechanical ventilation systems, it is advisable to use low-energy ground energy for preheating or cooling the outside air. Heat exchange between ground and outside air occurs in ground heat exchangers. Many factors influence the process of heat transfer between air in the heat exchanger and the ground, in particular geological and climatic parameters of the construction site, parameters of the ventilation air in the projected house, physical and geometric parameters of the heat exchanger tube. Part of the parameters when designing a ventilation system with earth-air heat exchangers couldn’t be changed. The one of the factors, the change which directly affects the process of heat transfer between ground and air, is convective heat transfer coefficient from the internal surface of the heat exchanger tube. In this article the designs of a horizontal earthair heat exchanger with heat pipes was proposed. The use of heat pipes in designs of a horizontal heat exchanger allows intensification of the process of heat exchange by turbulence of air flow inside the heat exchanger. Besides this, additionally heat transfer from the ground to the air is carried out at the expense of heat transfer in the heat pipe itself.

scholarly journals Heat exchanger design studies for molten salt fast reactor

2019 ◽  
Vol 5 ◽  
pp. 12
Author(s):  
Uğur Köse ◽  
Ufuk Koç ◽  
Latife Berrin Erbay ◽  
Erdem Öğüt ◽  
Hüseyin Ayhan
Keyword(s):  
Heat Exchanger ◽  
Molten Salt ◽  
Fast Reactor ◽  
Heat Exchangers ◽  
Temperature Drop ◽  
Freezing Temperature ◽  
Fuel Temperature ◽  
Design Studies ◽  
The Core ◽  
Heat Exchanger Design

In this study, conceptual design for primary heat exchanger of the Molten Salt Fast Reactor is made. The design was carried out to remove the produced heat from the reactor developed under the SAMOFAR project. Nominal power of the reactor is 3 GWth and it has 16 heat exchangers. There are several requirements related to the heat exchanger. To sustain the steady-state conditions, heat exchangers have to transfer the heat produced in the core and it has to maintain the temperature drop as much as the temperature rise in the core due to the fission. It should do it as fast as possible. It must also ensure that the fuel temperature does not reach the freezing temperature to avoid solidification. In doing so, the fuel volume in the heat exchanger must not exceed the specified limit. Design studies were carried out taking into account all requirements and final geometric configurations were determined. Plate type heat exchanger was adopted in this study. 3D CFD analyses were performed to investigate the thermal-hydraulic behavior of the system. Analyses were made by ANSYS-Fluent commercial code. Results are in a good agreement with limitations and requirements specified for the reactor designed under the SAMOFAR project.

A Comparative Overview of Marine Risers and Heat Exchanger Tube Banks

1991 ◽  
Vol 113 (1) ◽  
pp. 30-36
Author(s):  
M. M. Zdravkovich
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Design Guidelines ◽  
Heat Exchanger Tube ◽  
Marine Risers ◽  
Tube Arrays ◽  
Flow Induced Vibrations ◽  
Satellite Clusters ◽  
Tube Banks ◽  
Exchanger Tube

This is neither an original paper nor a review, but a comparative overview of two seemingly unrelated engineering fields. There are some similarities and strong dissimilarities between multipipe risers and tube arrays employed in heat exchangers. For example, square arrays are used in both, whereas “satellite” clusters cannot be found in heat exchangers. The extensive research on flow-induced vibrations in heat exchanger arrays reveals several mechanisms of excitation and sustenance of tube vibration. Some of the mechanisms identified for tube arrays may be relevant for marine risers. The main object of this comparative overview is to compile and discuss heat exchanger data which may be applicable to marine risers. Design guidelines are specified for satellite clusters.

Dynamics of Heat Exchanger Tube Banks

1977 ◽  
Vol 99 (3) ◽  
pp. 462-467 ◽  
Author(s):  
S. S. Chen
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
High Performance ◽  
Forced Vibrations ◽  
Heat Exchanger Tube ◽  
Flow Induced Vibration ◽  
Free And Forced Vibrations ◽  
Tube Banks ◽  
Fluid Interaction ◽  
Exchanger Tube

Flow-induced vibration in heat exchanger tube banks is of great concern, particularly in high performance heat exchangers used in nuclear raactor systems. In this paper, the dynamic characteristics of tube banks in stationary liquid are studied. A method of analysis is presented for free and forced vibrations of tube banks including tube/fluid interaction. Numerical results are given for tube banks subjected to various types of excitations.

Thermal-Hydraulic Character Effect Factors Analysis for Passive Residual Heat Removal System of Sodium-Cooled Fast Reactor

2012 ◽  
Author(s):  
Xiaolong Sun ◽  
Minjun Peng ◽  
Genglei Xia
Keyword(s):  
Heat Exchanger ◽  
Fast Reactor ◽  
Heat Exchangers ◽  
Heat Removal ◽  
Factors Analysis ◽  
Higher Temperature ◽  
Heat Removal System ◽  
China Experimental Fast Reactor ◽  
Removal System ◽  
Residual Heat

A theoretical investigation was performed on the passive residual heat removal system (PRHRs) of China Experimental Fast Reactor (CEFR). The system contained two air heat exchangers, two independent heat exchangers and several pipes. By means of JTOPMERET code developed by GSE, the thermodynamic model of the system had been built. Based on the model, transient characteristics of the PRHRs have been discussed in detail. Through the calculation analysis, it is then indicated that the capacity of removing residual heat was affected by some factors. The faster speed of air in the air heat exchanger, the higher temperature and the larger heat transfer area of the air heat exchanger are favorable to the PRHRs. At the same time, the calculated parameters variation trends are reasonable according to the Experimental data from CEFR.

Research of a heat exchanger tube durability of a phase transition accumulator, working in the composition of NPP

2019 ◽  
Vol 54 (1) ◽  
pp. 63-71
Author(s):  
V.E. Yurin ◽  
◽  
A.B. Moskalenko ◽  
M.A. Murtazov ◽  
◽  
...  
Keyword(s):  
Phase Transition ◽  
Heat Exchanger ◽  
Heat Exchanger Tube ◽  
Exchanger Tube
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