Thermal modeling of core sampling in flammable gas waste tanks. Part 2: Rotary-mode sampling

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The radioactive waste stored in underground storage tanks at Hanford site includes mixtures of sodium nitrate and sodium nitrite with organic compounds. The waste can produce undesired violent exothermic reactions when heated locally during the rotary-mode sampling. Experiments are performed varying the downward force at a maximum rotational speed of 55 rpm and minimum nitrogen purge flow of 30 scfm. The rotary drill bit teeth-face temperatures are measured. The waste is simulated with a low thermal conductivity hard material, pumice blocks. A torque meter is used to determine the energy provided to the drill string. The exhaust air-chip temperature as ... continued below

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13 p.

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Unal, C.; Poston, D.; Pasamehmetoglu, K.O. & Witwer, K.S. August 1, 1997.

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The radioactive waste stored in underground storage tanks at Hanford site includes mixtures of sodium nitrate and sodium nitrite with organic compounds. The waste can produce undesired violent exothermic reactions when heated locally during the rotary-mode sampling. Experiments are performed varying the downward force at a maximum rotational speed of 55 rpm and minimum nitrogen purge flow of 30 scfm. The rotary drill bit teeth-face temperatures are measured. The waste is simulated with a low thermal conductivity hard material, pumice blocks. A torque meter is used to determine the energy provided to the drill string. The exhaust air-chip temperature as well as drill string and drill bit temperatures and other key operating parameters were recorded. A two-dimensional thermal model is developed. The safe operating conditions were determined for normal operating conditions. A downward force of 750 at 55 rpm and 30 scfm nitrogen purge flow was found to yield acceptable substrate temperatures. The model predicted experimental results reasonably well. Therefore, it could be used to simulate abnormal conditions to develop procedures for safe operations.

Physical Description

13 p.

Notes

INIS; OSTI as DE97003399

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  • AICHE/ASME national heat transfer conference: current developments in numerical simulation of heat and mass transfer, Baltimore, MD (United States), 10-12 Aug 1997

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  • Other: DE97003399
  • Report No.: LA-UR--97-63
  • Report No.: CONF-970824--9
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 510326
  • Archival Resource Key: ark:/67531/metadc697199

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  • August 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 7:52 p.m.

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Unal, C.; Poston, D.; Pasamehmetoglu, K.O. & Witwer, K.S. Thermal modeling of core sampling in flammable gas waste tanks. Part 2: Rotary-mode sampling, article, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697199/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.