An Overview of Liquid-Fluoride-Salt Heat Transport Systems
Total Page:16
File Type:pdf, Size:1020Kb
ORNL/TM-2010/156 An Overview of Liquid-Fluoride-Salt Heat Transport Systems September 2010 Prepared by David E. Holcomb Sacit M. Cetiner DOCUMENT AVAILABILITY Reports produced after January 1, 1996, are generally available free via the U.S. Department of Energy (DOE) Information Bridge. Web site http://www.osti.gov/bridge Reports produced before January 1, 1996, may be purchased by members of the public from the following source. National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 Telephone 703-605-6000 (1-800-553-6847) TDD 703-487-4639 Fax 703-605-6900 E-mail [email protected] Web site http://www.ntis.gov/support/ordernowabout.htm Reports are available to DOE employees, DOE contractors, Energy Technology Data Exchange (ETDE) representatives, and International Nuclear Information System (INIS) representatives from the following source. Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831 Telephone 865-576-8401 Fax 865-576-5728 E-mail [email protected] Web site http://www.osti.gov/contact.html This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. ORNL/TM-2010/156 Nuclear Science and Technology Division AN OVERVIEW OF LIQUID-FLUORIDE-SALT HEAT TRANSPORT SYSTEMS Author(s) David E. Holcomb Sacit M. Cetiner Date Published: September 2010 Prepared by OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee 37831-6283 managed by UT-BATTELLE, LLC for the U.S. DEPARTMENT OF ENERGY under contract DE-AC05-00OR22725 CONTENTS Page LIST OF FIGURES ................................................................................................................................ v LIST OF TABLES ............................................................................................................................... vii ABBREVIATED TERMS..................................................................................................................... ix EXECUTIVE SUMMARY ................................................................................................................... xi ABSTRACT ........................................................................................................................................ xiii 1. INTRODUCTION ........................................................................................................................... 1 1.1 PURPOSE AND SCOPE ....................................................................................................... 1 1.2 SYSTEM CONCEPTUAL OVERVIEW .............................................................................. 1 1.3 SUMMARY OF PRIOR EXPERIENCE WITH LIQUID FLUORIDE SALTS ................... 3 1.3.1 Aluminum Smelting .................................................................................................. 3 1.3.2 Molten Salt Reactor Program .................................................................................... 3 1.3.3 Fusion First Wall Program ........................................................................................ 4 1.3.4 Electrodeposition ...................................................................................................... 4 2. STRUCTURES, SYSTEMS AND COMPONENTS FOR LIQUID FLUORIDE SALT HEAT TRANSPORT LOOPS..................................................................................................................... 5 2.1 OVERVIEW OF COMMON STRUCTURES, SYSTEMS AND COMPONENTS ............. 5 2.1.1 Heat Source and Heat Sink ....................................................................................... 5 2.1.2 Piping and Insulation ................................................................................................ 8 2.1.3 Liquid Salt Pumps ..................................................................................................... 8 2.2 SUPPORT SYSTEMS AND COMPONENTS ..................................................................... 9 2.2.1 Loop Preheating System ........................................................................................... 9 2.2.2 Fill and Drain System ............................................................................................. 10 2.2.3 Chemistry Control System ...................................................................................... 12 2.2.4 Expansion Tank ....................................................................................................... 13 2.2.5 Rupture Disks .......................................................................................................... 13 2.2.6 Instrumentation ....................................................................................................... 13 2.3 EMERGING COMPONENT TECHNOLOGIES ............................................................... 15 2.3.1 Canned Rotor Pumps .............................................................................................. 16 2.3.2 Dry Gas Seals .......................................................................................................... 18 2.4 A PARAMETRIC ANALYSIS FOR THE HEAT TRANSPORT SYSTEM ..................... 19 2.4.1 Flow Requirements ................................................................................................. 20 2.4.2 Pressure Loss ........................................................................................................... 23 2.4.3 Pumping Power ....................................................................................................... 24 2.5 OTHER ISSUES .................................................................................................................. 26 2.5.1 Salt Freeze-Out ....................................................................................................... 26 3. FLUORIDE SALT PROPERTIES AND CHEMISTRY ............................................................... 31 3.1 THERMOPHYSICAL PROPERTIES OF FLUORIDE SALTS ......................................... 31 3.1.1 Melting Point ........................................................................................................... 31 3.1.2 Vapor Pressure and Vapor Species ......................................................................... 32 3.1.3 Density .................................................................................................................... 34 3.1.4 Viscosity ................................................................................................................. 35 3.1.5 Thermal Conductivity ............................................................................................. 40 3.1.6 Heat Capacity .......................................................................................................... 42 3.1.7 Component Separation and Snow ........................................................................... 44 3.2 CORROSION CHEMISTRY ............................................................................................... 44 3.3 PREPARATION OF FLUORIDE SALT INVENTORY .................................................... 47 iii 4. LIQUID-FLUORIDE-SALT HEAT TRANSFER CHARACTERISTICS ................................... 49 4.1 A REVIEW OF LIQUID SALT HEAT TRANSFER MEASUREMENTS ........................ 49 4.2 HEAT TRANSFER CORRELATIONS .............................................................................. 55 5. OPERATION AND MAINTENANCE ISSUES ........................................................................... 57 5.1 STARTUP PROCEDURES ................................................................................................. 57 5.2 ACTIVE REDOX CORROSION CONTROL .................................................................... 57 5.3 TRITIUM CONTROL ......................................................................................................... 61 6. CONCLUSIONS ........................................................................................................................... 63 REFERENCES ..................................................................................................................................... 65 iv LIST OF FIGURES Figure Page 1 Schematic drawing of a liquid-salt heat transport system ...................................................... 2 2 Possible configuration option for a liquid salt heat transport loop—direct electrical cycle and a parallel intermediate heat exchanger (IHX) ........................................................ 6 3 Possible configuration option for a liquid-salt heat transfer loop—indirect electrical cycle and a parallel secondary heat exchanger (SHX) ........................................................... 7 4 MSRE fuel pump ..................................................................................................................