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US 4,472,354 AGranted
System for continuously monitoring the ionic content of steam-producing water
AssigneeElectric Power Research Institute, Inc.
InventorsThomas O. Passell, Michel N. Robles, James L. Simpson, Constantine N. Spalaris
Life of this patent
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Abstract
An on-line and continuous sampling system for monitoring the ionic content of steam-producing water in a steam-operated electrical power plant. The monitoring system comprises a plurality of sampling lines and associated apparatus for sampling the steam-producing water at a number of different points in the power plant, an ion chromatographic subsystem for analyzing the sampled water, a calibration subsystem for calibrating the ion chromatographic subsystem, and an automatic control subsystem for operating the monitoring system of the present invention.
Claims15
A system for monitoring corrosive impurities in the steam-producing water of a steam-operated electrical power plant, comprising:
- a plurality of sample lines connected at different points in the power plant for on-line and continuous sampling of the steam-producing water at said different points;
- valve means in each of said sample lines for controlling the flow of steam-producing water therethrough;
- conduit means connected to each of said sample lines for flowing steam-producing water from said sample lines;
- filter means in each of said conduit means;
- a means defining a sample reservoir connected to each of said conduit means for the flow of steam-producing water from said sample lines thereinto;
- means defining and containing a supply of nitrogen and means for feeding said nitrogen to said sample reservoirs so that nitrogen is added thereto to cover the steam-producing water in said sample reservoirs;
- stirring means in each of said sample reservoirs for mixing the steam-producing water in said sample reservoirs;
- valve means in each of said conduit means for controlled flow of steam-producing water therethrough, said valve means including a first valve for controlling the flow of water into said conduit means and a metering valve for metering the flow of steam-producing water through said conduit means into said sample reservoirs;
- a plurality ion chromatographs for detecting the presence of selected corrosive impurities in the steam-producing water at said different points;
- means for selectively connecting any of said sample reservoirs to any one of said ion chromatographs for the flow of steam-producing water thereto;
- calibration means connectable in fluid communication with said ion chromatographs for calibrating said ion chromatographs, said calibration means including
- (i) a plurality of calibration reservoirs each containing a stock standard solution for calibrating a respective one of said ion chromatographs,
- (ii) means for selectively transferring any one of said stock standard solutions to a dilution reservoir,
- (iii) means for spraying water into said dilution reservoir for diluting said stock standard solution contained therein,
- (iv) means for stirring said stock standard solution and said water in said dilution reservoir, and
- (v) means for flowing said stock standard solution from said dilution reservoir to a selected one of said ion chromatographs;
- and
- control means for automatically controlling the operation of the on-line and continuous sampling of the steam-producing water, said ion chromatographs, and said calibration means.
15 more elements
A system for monitoring the ionic content of the steam-producing water in a steam-operated electrical generating power plant, comprising:
- a plurality of sample lines connectable in fluid communication with the steam-producing water at different points within the power plant;
- means for controlling the flow of steam-producing water through each of said sample lines for a predetermined period of time comprising a fill cycle;
- means defining a plurality of sample reservoirs, each of said sample lines connectable in fluid communication with a respective one of said sample reservoirs for the flow of steam-producing water thereinto during said fill cycle;
- a plurality of ion chromatographs for detecting for the presence of selected ions in the steam-producing water;
- selector valve means for flowing the steam-producing water from any one of said sample reservoirs to a selected one of said ion chromatographs so as to determine the ionic content of the steam-producing water at said different points over said predetermined period of time;
- means defining and containing a source of inert gas and means for feeding said inert gas to said sample reservoirs so that said inert gas is added thereto to cover the steam-producing water therein;
- a plurality of calibration reservoirs each containing a stock standard solution for calibrating a respective one of said ion chromatographs prior to the initiation of a fill cycle;
- means for diluting said stock standard solutions;
- means for flowing a selected one of said diluted stock standard solutions to a respective one of said ion chromatographs;
- and
- control means for automatically controlling the flow of the steam-producing water and the stock standard solutions to said ion chromatographs.
8 more elements
A system for continuous sampling and on-line monitoring of the ionic content of the steam-producing water in an electrical generating power plant, comprising:
- a plurality of sample lines for flowing steam-producing water from different points within the plant steam/water cycle;
- valve means in each of said sample lines for controlling the flow of steam-producing water into said sample lines;
- cooling means in each of said sample lines for reducing the temperature of the steam-producing water flowing therethrough;
- conduit means connected to each of said sample lines for flowing the steam-producing water from said sample lines;
- a means defining a sample reservoir in fluid communication with each of said conduit means for the flow of steam-producing water thereinto;
- means defining and containing a source of inert gas and means for feeding said inert gas to said sample reservoirs so that said inert gas is added thereto to cover the steam-producing water therein;
- valve means in each of said conduit means for controlled flow of the steam-producing water into said sample reservoirs over a predetermined period of time comprising a fill cycle;
- a plurality of ion chromatographs for detecting the ionic content of the steam-producing water;
- a first selector valve means and constant volume metering pump means for selectively flowing the steam-producing water from any one of said sample reservoirs to a selected one of said ion chromatographs so as to determine the ionic content of the steam-producing water at said different points during said fill cycle;
- a plurality of calibration reservoirs each containing a stock standard solution for use in calibrating a respective one of said ion chromatographs;
- means for diluting said stock standard solutions;
- and
- a second selector valve means and constant volume metering pump means for flowing a respective one of said diluted stock standard solutions to a selected one of said ion chromatographs.
10 more elements
Dependencies are inferred from the claim text.