Evaluation of thermal decomposition rate of carbohydrazide and its reducing effect on carbon steel corrosion
Creators
- 1. Central Research Inst. of Electric Power Industry, Komae, Tokyo (Japan). Komae Research Lab.
- 2. Kyushu Electric Power Co., Inc., Fukuoka (Japan). Research Lab.
Description
Hydrazine as an oxygen scavenger has been widely used for the feed water treatment of PWR secondary side and fossil power plants in the world. However, there is some concern over health and safety issues related to the use of hydrazine. Carbohydrazide is listed up as one of alternative oxygen scavengers. In this study, laboratory tests were performed to examine the thermal decomposition rate of carbohydrazide and its reducing effect on carbon steel corrosion in comparison with hydrazine. Test results revealed that carbohydrazide was stable below 373 K. The thermal decomposition ratios of carbohydrazide were less than 50% after 20 minutes exposure in the range of 373 K to 428 K. Its thermal decomposition rate constant was derived from experimental test data. The measurement of dissolved oxygen concentration also showed that carbohydrazide possessed a fairly good oxygen scavenger property. Judging from test results mentioned above, it was concluded that carbohydrazide is applicable as an alternative oxygen scavenger for feedwater treatment in PWR and fossil power plant
Additional details
Publishing Information
- Publisher
- NACE International.
- Imprint Place
- Houston, TX (United States)
- Imprint Title
- Corrosion/97 conference papers
- Imprint Pagination
- [4584 p.].
- Journal Page Range
- p. 12, Paper 89.
Conference
- Title
- economics and performance - bridging the gap and NACExpo.
- Acronym
- Corrosion 97. 52. annual corrosion conference of the National Association of Corrosion Engineers
- Dates
- 9-14 Mar 1997.
- Place
- New Orleans, LA (United States).
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 29012599
- Subject category
- S36: MATERIALS SCIENCE; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Resource subtype / Literary indicator
- Conference, Numerical Data
- Descriptors DEI
- CARBON STEELS; CORROSION INHIBITORS; DISSOLVED GASES; EXPERIMENTAL DATA; FEEDWATER; FOSSIL-FUEL POWER PLANTS; HYDRAZIDES; HYDRAZINE; OXYGEN; PWR TYPE REACTORS; THERMAL DEGRADATION; WATER CHEMISTRY
- Descriptors DEC
- ALLOYS; CARBON ADDITIONS; CHEMISTRY; DATA; ELEMENTS; ENRICHED URANIUM REACTORS; FLUIDS; GASES; HYDROGEN COMPOUNDS; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; NONMETALS; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; POWER PLANTS; POWER REACTORS; REACTORS; SOLUTES; STEELS; THERMAL POWER PLANTS; THERMAL REACTORS; TRANSITION ELEMENT ALLOYS; WATER; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Secondary number(s)
- CONF-970332--.