Using digital systems to control air pulsers

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Air pulsing is a standard method used at the Hanford Site for enhancing the efficiency of sieve tray columns. Air is injected into the base of the column and then vented using a latching solenoid valve. This ``shaking`` action increases the contact between the two liquid phases in the column. The existing analog speed controllers can vary the pulse rate from 0 to 100 pulses per minute. The controllers are nonlinear, and replacement with digital controllers is desired. Simulator tests, however, showed erratic results when a digital controller was used. This was traced to the scan time of the controller. ... continued below

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7 p.

Creation Information

Silvan, G.R. April 1, 1995.

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  • Westinghouse Hanford Company
    Publisher Info: Westinghouse Hanford Co., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

Air pulsing is a standard method used at the Hanford Site for enhancing the efficiency of sieve tray columns. Air is injected into the base of the column and then vented using a latching solenoid valve. This ``shaking`` action increases the contact between the two liquid phases in the column. The existing analog speed controllers can vary the pulse rate from 0 to 100 pulses per minute. The controllers are nonlinear, and replacement with digital controllers is desired. Simulator tests, however, showed erratic results when a digital controller was used. This was traced to the scan time of the controller. The 0.1 second scan rate of the controller, although fast enough to control at 100 pulses per minute, could not handle small setpoint changes. This was especially true at the high end of the range, and was due to the integer relationship created by the scan time. Using a controller specially modified to scan every 0.01 second will lessen the problem. This experience has shown that resolution, as well as maximum rate, should be considered when specifying scan rates requirements for digital controllers.

Physical Description

7 p.

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INIS; OSTI as DE95011636

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  • International conference and exhibit of the Instrument Society of America, New Orleans, LA (United States), 2-5 Oct 1995

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  • Other: DE95011636
  • Report No.: WHC-SA--2856
  • Report No.: CONF-951048--1
  • Grant Number: AC06-87RL10930
  • Office of Scientific & Technical Information Report Number: 90102
  • Archival Resource Key: ark:/67531/metadc794903

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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.

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Creation Date

  • April 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

Description Last Updated

  • Feb. 8, 2016, 9:51 p.m.

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Silvan, G.R. Using digital systems to control air pulsers, article, April 1, 1995; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc794903/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.