Loop testing of alternative amines for all-volatile treatment control in PWRs

Technical Report · Mon Jun 01 04:00:00 EDT 1992

OSTI ID:7269491

Shenberger, D M; Zupanovich, J D; Walker, J L ^[1]; Nolan, N W ^[2]

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1. Calgon Corp., Pittsburgh, PA (United States). Water Management Div.
2. Halliburton NUS Environmental Corp., Pittsburgh, PA (United States)

The performance of six amines plus ammonia was evaluated in the high pressure test boiler system operating located at Calgon Center, Pittsburgh, PA. The amines tested were: 1,2-diaminoethane, ethanolamine, morpholine, 2-amino-2-methyl-l-propanol, 3-methoxypropylamine, and 3-hydroxyquinuclidine. All loop tests were conducted at 286{degrees}C (1000 psig) with 4-5% blowdown and an average steam flow of approximately 90 lbs/hr. Amines were fed to give a feedwater pH{sub 25{degree}C} of 9.0. Six sample streams including the low temperature feedwater water, final feedwater, blowdown, high pressure steam, low pressure steam, and condensate return were monitored by online ion chromatography for the dominant cations and anions. Additional samples were taken daily for pH, conductivity, and iron analysis. Summary graphs are presented for much of the data. Measured amine relative volatilities show the trend DAE {congruent} ETA {congruent} 3HQ < AMP < morpholine < MPA < ammonia. Distribution and pH calculations in a model PWR demonstrate that all the amines offer superior performance to ammonia for corrosion control in wet steam piping, with 3HQ and DAE offering maximum protection. System mass balances were calculated yielding the fraction of amine decomposition, and the quantity of the degradation products ammonia, acetate, and formate generated by decomposition. Both DAE and AMP exhibited extensive degradation, but extrapolation to PWR conditions indicates that any of the amines is sufficiently stable for use in AVT. ETA, DAE, and 3HQ have the best overall performance.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Calgon Corp., Pittsburgh, PA (United States). Water Management Div.; Halliburton NUS Environmental Corp., Pittsburgh, PA (United States)
• Sponsoring Organization: EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 7269491
• Report Number(s): EPRI-TR-100756
• Country of Publication: United States
• Language: English

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