# Schmidt

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Entertainment

Published on November 8, 2007

Author: Columbia

Source: authorstream.com

A Model for Purging a 15,000 ton LAR TPC tank :  A Model for Purging a 15,000 ton LAR TPC tank Richard Schmitt Fermi National Accelerator Lab March 13, 2006 Topics:  Topics Large flat bottom tanks Purging goal Calculation results Examples Plans Flat Bottom Tank:  Flat Bottom Tank Commonly used for largest LNG (liquefied natural gas) storage Well known technology Excellent safety record Reasonable cost Can not withstand vacuum Slide5:  50 m diameter Air Purging Goals:  Air Purging Goals Purge to less than 10 ppm O2 Liquid Argon arrives with 1 ppm oxygen and is purified Warm gas contain 0.1% of the contamination that must be removed Purge in a reasonable length of time Analysis & Calculations:  Analysis & Calculations ANSYS-CFX, finite volume analysis Hand calculations Fick’s law Boundary layer Perfect mixing Uniform Inlet, Single Outlet:  Uniform Inlet, Single Outlet Tank Diameter 24.5 m Tank Height 24.5 m Total flow 8.5 m3/minute Tank volume change every 22 hours Isothermal at 20C Slide9:  One volume change Slide10:  Concentration after nine volume changes Center of tank is in upper left Single Outlet Conclusions:  Single Outlet Conclusions Residual air is left in the outer, upper part of the tank Average oxygen concentration is 300 ppm A single outlet is inadequate Local inlet model:  Local inlet model Inlet spacing 2.1 m 100 inlets Model height 2.4 m Slide13:  One ppm reached in 30 hours at 2.4 m elevation Some mixing occurs Distribution plot Slide14:  Red 3200 to 3600 ppm oxygen Orange 2800 to 3200 ppm oxygen Hand Calculations:  Hand Calculations As a rough check of ANSYS analysis Diffusion calculations per Fick’s Law Boundary layer diffusion Perfect mixing Purging Examples:  Purging Examples LNG tank purging SELEX Ring Imaging Cherenkov Small test tank LNG tank purging:  LNG tank purging One inlet/one outlet Purged with nitrogen at room temperature Typically achieve 1% oxygen in one day, one volume change This rough number compares well with the single outlet model Initially outlet is all air later oxygen concentration drops rapidly SELEX RICH:  SELEX RICH Purged with Neon 44 m3 volume, horizontal cylinder Purge headers along the top and bottom Purge rate 0.5 m3/minute Outlet reached 2 ppm oxygen in 7 hours Small tank:  Small tank Vertical, cylindrical tank 1.5m diameter, 4.5m3 volume Mean velocity 1.2m/hour Dispersed inlet, single outlet Small tank model early results:  Small tank model early results 0.3 hours One hour Slide21:  one volume change Small Tank - outlet:  Small Tank - outlet Supply argon contains 8.5 ppm oxygen Ten volume changes Planning:  Planning Analyze more details with ANSYS Importance of other contaminants, nitrogen, water, carbon dioxide Test 10 m diameter water tank with distribution and venting pipe system Palladium catalyst vs. venting cost comparison

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