Development of advanced in-situ techniques for chemistry monitoring and corrosion mitigation in SCWO environments. 1998 annual progress report

PDF Version Also Available for Download.

Description

'This report evaluates the two years results of the research on the development of advanced electrochemical techniques for use in supercritical water oxidation (SCWO) environments. The SCWO technology was found to be a promising approach to treat a variety of hazardous wastes. However, the corrosion processes in the SCWO reactors is still a problem for further development of this technology. The authors have developed a flow-through electrochemical cell (FTEC) which allows us to monitor the corrosion process in real time at temperatures up to 500 C and pressures up to 400 bar. The FTEC consists of a flow-through Ag/AgCl external ... continued below

Physical Description

3 pages

Creation Information

Macdonald, D.D.; Engelhardt, G. & Garcia, K.M. June 1, 1998.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Authors

Sponsor

Publisher

  • Pennsylvania State University
    Publisher Info: Pennsylvania State Univ., University Park, PA (United States)
    Place of Publication: University Park, Pennsylvania

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

'This report evaluates the two years results of the research on the development of advanced electrochemical techniques for use in supercritical water oxidation (SCWO) environments. The SCWO technology was found to be a promising approach to treat a variety of hazardous wastes. However, the corrosion processes in the SCWO reactors is still a problem for further development of this technology. The authors have developed a flow-through electrochemical cell (FTEC) which allows us to monitor the corrosion process in real time at temperatures up to 500 C and pressures up to 400 bar. The FTEC consists of a flow-through Ag/AgCl external pressure-balanced reference electrode, a flow-through platinum hydrogen electrode, an yttria-stabilized zirconia pH sensor and an electrochemical noise sensor. The new FTEC has been designed to serve as a measurement vessel for the high temperature and high pressure circulation once-through flow loop and titanium alloy was chosen as the construction material. The FTEC, shown schematically in Figure 1, is used for the experiments. Two HPLC pumps are employed in the system, one for pumping the reaction solution through the loop and the other for pumping the reference solution through the reference electrode. The system pressure is sustained as a constant via a back pressure regulator. The temperature was measured using a thermocouple installed at the center of the FTEC. Because many physico-chemical processes, including corrosion, are sensitive to the pH, the measurement and control of pH is very important for the high temperature SCWO environment. The authors have measured the potentials of the FTEC for several HCl(aq) + NaCl(aq) solutions of different concentrations of HCl(aq) and derived the corresponding pH differences ({Delta}pH) over a wide range of temperatures at pressure around 350 bar. Comparison of the experimentally derived and theoretically calculated DpH values presented in Figure 2 clearly demonstrates the ability to measure pH with a high accuracy (better than \2610.05 pH units). This result also shows the viability of the developed FTEC as a versatile potentiometric system for use at supercritical temperatures. During the next year of the project they will address the problem of electrochemical noise measurements and monitoring corrosion processes that occur on metallic materials exposed to super critical water.'

Physical Description

3 pages

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE00013443
  • Report No.: EMSP-55171--98
  • Grant Number: NONE
  • DOI: 10.2172/13443 | External Link
  • Office of Scientific & Technical Information Report Number: 13443
  • Archival Resource Key: ark:/67531/metadc627438

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • June 1, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • Feb. 20, 2017, 1:17 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 3

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Macdonald, D.D.; Engelhardt, G. & Garcia, K.M. Development of advanced in-situ techniques for chemistry monitoring and corrosion mitigation in SCWO environments. 1998 annual progress report, report, June 1, 1998; University Park, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc627438/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.