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Evaluation of Demonstration Test Results of Alternative Technologies for Demilitarization of Assembled Chemical Weapons A Supplemental Review for Demonstration II (2001) / Chapter Skim
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3 Foster Wheeler/ECO Logic/ KV Aerner Integrated Demilitarization Process
Pages 23-30

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From page 23...
... No major changes have been made to the SCWO system, but there are some differences between the SCWO unit previously tested and the SCWO units proposed for EDS and for full-scale operation. Changes have also been made to equipment downstream of the SCWO reactor to facilitate processing of the suspended solids in the reactor effluent, especially for aluminum-rich feeds.
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From page 24...
... · Characterize the gas, liquid, and solid process streams from the TW-SCWO process for selected chemical constituents and physical parameters and the presence or absence of hazardous, toxic, agent, and CWC Schedule 2 compounds. To meet these objectives, four 100-hour validation tests of the TW-SCWO unit were planned, with each test preceded by a workup run.
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From page 25...
... Because the replacement liner was designed for a lower section of the reactor, it had smaller holes than the top sections and a slower flow rate; accordingly, a bleed hole for additional transpiration water flow was added to ensure the appropriate pressure drop and to increase the flow rate. This field modification led to a highly asymmetric flow of transpiration water and formation of a blister in the liner near the bleed hole, which was discovered during testing.
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From page 26...
... The committee believes these modifications should be demonstrated during EDS testing. Before the full-scale plant design is finalized, the committee also recommends demonstration tests for the following changes suggested by Foster Wheeler: using oxygen instead of air in the SCWO reactor increasing the temperature of the transpiration water to reduce thermal stresses during planned and unplanned shutdowns altering the flow circuitry of water in the transpiring wall using an evaporator/crystallizer instead of a flash separator after the reactor A much more detailed discussion of the TW-SCWO Demo II testing can be found in Assembled Chemical Weapons Assessment Program: Annual Report to Congress (DoD, 2001)
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From page 27...
... Since then, the hydrolysis process has been changed; the moving parts driving the baskets have been removed from the caustic bath and replaced with an overhead chain conveyor system. As a result, the maintenance associated with the hydrolysis process, which is performed by workers 27 in DPE suits, is expected to be reduced, with a corresponding increase in worker safety.
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From page 28...
... The TRBP treatment of the firing tubes produced a solid residue that largely remained in the reactor. In the treatment of neat GB and mortars containing HD, no suspended solids were detected in the scrubber solution, indicating that appreciable amounts of carbon dust did not form in the reactor and exit with the product gas.
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From page 29...
... The hot-caustic environments in the initial hydrolysis vessels will pose severe challenges to the reliability and operability of the equipment inside these vessels, especially the basket transport mechanisms. Removal of agent by caustic solution jet washout and movement of metal parts through a caustic bath in baskets were not tested in Demo II.
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From page 30...
... SUPPLEMENTAL RECOMMENDATIONS Recommendation DII FEK-1. Since the hydrolysate/total feed ratio and flow velocity used in Demo II testing are so different from those of the proposed design, the TW-SCWO reactor must be tested at a hydrolysate/total feed ratio and flow velocities close to the proposed design conditions.
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Key Terms

  • finding dii
  • product gas
  • scwo reactor
  • scrubber solution
  • technology provider

  • firing tubes
  • water flow
  • cwc schedule
  • caustic hydrolysis
  • epa syngas

  • caustic bath
  • flow rates
  • upper liner
  • supercritical water
  • reactor liner

  • foster wheeler
  • flow rate
  • thermal reduction
  • process streams
  • chemical agent

  • proposed design
  • reactor design
  • design conditions
  • solid process
  • remains valid

  • flow velocities
  • water oxidation
  • feed ratio
  • hazardous waste
  • hydrolysis process


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