Monitoring system for plant operation condition and its in-situ electrochemical electrode

A monitoring system for plant operating conditions comprising:

• means for sampling consecutively information directly relating to high temperature water quality in an objective monitoring section of the plant in a period from one inspection to the next inspection of the plant with an electrochemical water quality sensor disposed in said objective monitoring section of the plant;
• means for evaluating the water quality based on the sampled information;
• means for comparing the obtained results of water quality evaluation with a predetermined reference value for the plant operation and manipulation;
• and means for displaying or recording necessary portions of said comparison result;
• wherein said electrochemical water quality sensor comprises an electrochemical reference electrode provided with a solid electrolyte layer containing ions of the reference electrode member, a porous ceramic layer in contact with and surrounding the electrolyte layer, a counter electrode member disposed in electrochemical relation with said electrolyte layer, a heat resistant porous ceramic overcoat layer surrounding said ceramic layer which is non-liquid-permeable but ion-permeable, said porous layer being in contact with surrounding said reference electrode and said electrolyte so that said high temperature water does not directly contact said electrode and electrolyte, whereby dissolution of said reference electrode material into said high temperature water is substantially suppressed but said reference electrode is in electrochemical communication with said water, and terminals electrically contacting said electrode members.

A monitoring system for plant operating conditions comprising:

• means for sampling consecutively information directly relating to high temperature water quality in an objective monitoring section of the plant in a predetermined period with a electrochemical water quality sensor disposed in said objective monitoring section of the plant and in which the high temperature water in said objective monitoring sections contacts electrochemically with electrolyte through a porous material, said electrochemical water quality sensor comprising a reference electrode, an electrolyte body in contact with said reference electrode, a counter electrode disposed in electrochemical relation with said reference electrode, a porous layer of water-impermeable, ion-permeable and heat resistant material, and terminal electrically contacting with said electrodes, said porous layer being in contact with and surrounding said reference electrode and said electrolyte so that said high temperature water does not directly contact said electrode and electrolyte, whereby dissolution of said reference electrode material into said high temperature water is substantially suppressed but said reference electrode is in electrochemical communication with said water;
• means for analyzing the water quality based on the sampled information;
• means for comparing the obtained results of water quality analyzation with a predetermined reference value for the plant operation and manipulation;
• and means for displaying or recording necessary portions of the resulting comparison.

A monitoring system for plant operating conditions comprising:

• means for sampling consecutively information directly relating to water quality of high temperature water in an objective monitoring section of the plant in a predetermined period with an electrochemical water quality sensor disposed in said objective monitoring section of the plant and in which the high temperature water in said objective monitoring section contacts electrochemically with an electrolyte through a porous material substantially suppressing dissolution of the electrolyte to the high temperature water, said electrochemical water quality sensor comprising a reference electrode in contact with an electrolyte material, a heat resistant, insoluble, a porous material layer in contact with and a surrounding said reference electrode and said electrolyte material so as to substantially isolate the electrode and electrolyte from the water, a terminal electrically contacting said reference electrode, a pH electrode disposed in electrochemical relation with said reference electrode and surrounded by the heat resistant, insoluble, porous material, and a terminal electrically contacting said pH electrode, whereby dissolution of said reference electrode and pH electrode into high temperature water is substantially suppressed but said electrodes are electrochemically communicated with said high temperature water;
• means for analyzing the water quality based on the sampled information;
• means for comparing the obtained results of water quality analyzation result with a predetermined reference value for the plant operation and manipulation;
• and means for displaying and/or recording necessary portions of the resulting comparison information.

A monitoring system for plant operating conditions comprising:

• means for analyzing consecutively water quality in a circulation water line or a storage water line in a period from a periodic inspection to the next inspection of the plant with an electrochemical sensor disposed in said objective monitoring section of the plant including high temperature water, said electrochemical sensor comprising a reference electrode in contact with an electrolyte material, a heat resistant, insoluble, porous material layer in contact with an completely surrounding said reference electrode and said electrolyte material, a terminal electrically contacting said reference electrode, a pH electrode disposed in electrochemical relation with said reference electrode and surrounded by the heat resistant, insoluble, porous material, and a terminal electrically contacting said pH electrode, whereby dissolution of said reference electrode and pH electrode into high temperature water is substantially suppressed but said electrodes re electrochemically communicated with said high temperature water;
• means for displaying the analyzed result;
• means for selecting a predetermined reference value for the plant operation and manipulation in response to the analyzed water quality result;
• means for predicting variation of said reference value based on the mutual relationship between the analyzed result and the reference value for the plant operation and manipulation;
• and means for controlling water quality.

A monitoring system for plant operating conditions comprising:

• means for analyzing consecutively water quality in a circulation water line or a storage water line in a period from a periodic inspection to the next inspection of the plant with an electrochemical sensor disposed in said objective monitoring section of the plant including high temperature water and for outputting data relating to at least pH, an amount dissolved oxygen and concentration of dissolved hydrogen, said electrochemical sensor comprising a reference electrode, an electrolyte body in contact with said reference electrode, a counter electrode disposed in electrochemical relation with said electrolyte a porous layer of water impermeable, ion-permeable and heat resistant material, and terminals electrically contacting said electrodes, said porous layer being in contact with and substantially isolating said electrode and electrolyte from the water, whereby dissolution of said reference electrode material into said high temperature water is substantially suppressed but said reference electrode is electrochemically communicated with said water;
• means for displaying the analyzed result;
• means for selecting a predetermined reference value for the plant operation and manipulation in response to the analyzed water quality result;
• means for predicting variation of said reference value based on the mutual relationship between the analyzed result and the reference value for the plant operation and manipulation;
• and means for controlling water quality.