Maximum total organic carbon limit for DWPF melter feed

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Description

DWPF recently decided to control the potential flammability of melter off-gas by limiting the total carbon content in the melter feed and maintaining adequate conditions for combustion in the melter plenum. With this new strategy, all the LFL analyzers and associated interlocks and alarms were removed from both the primary and backup melter off-gas systems. Subsequently, D. Iverson of DWPF- T{ampersand}E requested that SRTC determine the maximum allowable total organic carbon (TOC) content in the melter feed which can be implemented as part of the Process Requirements for melter feed preparation (PR-S04). The maximum TOC limit thus determined in this ... continued below

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28 p.

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Choi, A.S. March 13, 1995.

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Description

DWPF recently decided to control the potential flammability of melter off-gas by limiting the total carbon content in the melter feed and maintaining adequate conditions for combustion in the melter plenum. With this new strategy, all the LFL analyzers and associated interlocks and alarms were removed from both the primary and backup melter off-gas systems. Subsequently, D. Iverson of DWPF- T{ampersand}E requested that SRTC determine the maximum allowable total organic carbon (TOC) content in the melter feed which can be implemented as part of the Process Requirements for melter feed preparation (PR-S04). The maximum TOC limit thus determined in this study was about 24,000 ppm on an aqueous slurry basis. At the TOC levels below this, the peak concentration of combustible components in the quenched off-gas will not exceed 60 percent of the LFL during off-gas surges of magnitudes up to three times nominal, provided that the melter plenum temperature and the air purge rate to the BUFC are monitored and controlled above 650 degrees C and 220 lb/hr, respectively. Appropriate interlocks should discontinue the feeding when one or both of these conditions are not met. Both the magnitude and duration of an off-gas surge have a major impact on the maximum TOC limit, since they directly affect the melter plenum temperature and combustion. Although the data obtained during recent DWPF melter startup tests showed that the peak magnitude of a surge can be greater than three times nominal, the observed duration was considerably shorter, on the order of several seconds. The long surge duration assumed in this study has a greater impact on the plenum temperature than the peak magnitude, thus making the maximum TOC estimate conservative. Two models were used to make the necessary calculations to determine the TOC limit.

Physical Description

28 p.

Notes

INIS; OSTI as DE97060041

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  • Other Information: PBD: 13 Mar 1995

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  • Other: DE97060041
  • Report No.: WSRC-TR--95-0119
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/403976 | External Link
  • Office of Scientific & Technical Information Report Number: 403976
  • Archival Resource Key: ark:/67531/metadc685574

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  • March 13, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 9, 2016, 8:54 p.m.

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Choi, A.S. Maximum total organic carbon limit for DWPF melter feed, report, March 13, 1995; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc685574/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.