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Notes on the Harwell Carbon Meter (HCM)

Abstract

The sensor of the HCM is an iron membrane, generally in the form of a helically wound tube, the inner surface of which has been oxidised to form an iron oxide film. When immersed in the liquid sodium, preferably in the temperature range 500-650 deg. C, the outer surface of the membrane will rapidly achieve the same carbon activity ({alpha}{sub C}) as the sodium and carbon will diffuse through the iron. When the carbon reaches the inner surface it reacts with the iron oxide to form CO and CO{sub 2} which are swept away by a flow of inert carrier gas. Thus, at the inner surface of the membrane is maintained close to zero. In this way there is produced across the membrane a carbon activity gradient. The rate of diffusion of carbon through the membrane and the resulting flux of CO+CO{sub 2} are directly proportional to {alpha}{sub C} the membrane outer surface and, by the same token, directly proportional to {alpha}{sub C} in the sodium. The rate of production of CO+CO{sub 2} is measured continuously by passing the carrier gas through an analytical unit.
Authors:
Asher, R C; Kirstein, T B.A. [1] 
  1. AERE, Harwell, Oxon (United Kingdom)
Publication Date:
May 01, 1980
Product Type:
Conference
Report Number:
IWGFR-33
Resource Relation:
Conference: IAEA-IWGFR specialists' meeting on carbon in sodium, Harwell (United Kingdom), 27-30 Nov 1979; Other Information: 7 figs; PBD: May 1980; Related Information: In: Specialists' meeting on carbon in sodium. Summary report, 194 pages.
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 22 GENERAL STUDIES OF NUCLEAR REACTORS; CARBON; CARBON DIOXIDE; CARBON METERS; CARBON MONOXIDE; CHEMICAL PROPERTIES; DIFFUSION; IRON OXIDES; MEMBRANES; SODIUM; TEMPERATURE RANGE 0400-1000 K
OSTI ID:
20244562
Research Organizations:
International Atomic Energy Agency, International Working Group on Fast Reactors, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA0200950017266
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 92-101
Announcement Date:

Citation Formats

Asher, R C, and Kirstein, T B.A. Notes on the Harwell Carbon Meter (HCM). IAEA: N. p., 1980. Web.
Asher, R C, & Kirstein, T B.A. Notes on the Harwell Carbon Meter (HCM). IAEA.
Asher, R C, and Kirstein, T B.A. 1980. "Notes on the Harwell Carbon Meter (HCM)." IAEA.
@misc{etde_20244562,
title = {Notes on the Harwell Carbon Meter (HCM)}
author = {Asher, R C, and Kirstein, T B.A.}
abstractNote = {The sensor of the HCM is an iron membrane, generally in the form of a helically wound tube, the inner surface of which has been oxidised to form an iron oxide film. When immersed in the liquid sodium, preferably in the temperature range 500-650 deg. C, the outer surface of the membrane will rapidly achieve the same carbon activity ({alpha}{sub C}) as the sodium and carbon will diffuse through the iron. When the carbon reaches the inner surface it reacts with the iron oxide to form CO and CO{sub 2} which are swept away by a flow of inert carrier gas. Thus, at the inner surface of the membrane is maintained close to zero. In this way there is produced across the membrane a carbon activity gradient. The rate of diffusion of carbon through the membrane and the resulting flux of CO+CO{sub 2} are directly proportional to {alpha}{sub C} the membrane outer surface and, by the same token, directly proportional to {alpha}{sub C} in the sodium. The rate of production of CO+CO{sub 2} is measured continuously by passing the carrier gas through an analytical unit.}
place = {IAEA}
year = {1980}
month = {May}
}