Liquid Composition Sensor in Scaling Environment
First Claim
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1. A system for measuring a component in a liquid that comprises:
- a sensor device that is configured to be positioned in the liquid;
a source of an aqueous mixture of scaling inhibitors; and
means for continuously distributing an effective amount of the aqueous mixture of scaling inhibitors into the liquid in the vicinity of the sensor device, characterized in that scale deposition in the form of salts that are present in the liquid onto the sensor device is effectively controlled to permit continuous operation of the sensor device for more than a month without cleaning.
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Abstract
Scale formation on the electrode(s) of a liquor sensor can be prevented by continuously delivering a water-soluble scale inhibitor or dispersant into the vicinity of the electrodes of a liquor sensor device. Scale inhibitors include, for instance, polymers that are derived from acrylic acid, maleic acid, acrylamide acid, phosphonate, and combinations thereof. An aqueous mixture of scaling inhibitor continuously delivered to the probe tip of the liquor sensor that was placed in a kraft pulping liquor allowed the sensor to operate accurately for over a month without having to be cleaned of scale.
10 Citations
20 Claims
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1. A system for measuring a component in a liquid that comprises:
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a sensor device that is configured to be positioned in the liquid; a source of an aqueous mixture of scaling inhibitors; and means for continuously distributing an effective amount of the aqueous mixture of scaling inhibitors into the liquid in the vicinity of the sensor device, characterized in that scale deposition in the form of salts that are present in the liquid onto the sensor device is effectively controlled to permit continuous operation of the sensor device for more than a month without cleaning. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. The system of claim I wherein the sensor device is a multi-electrode device having a plurality of electrodes that are configured to be positioned in the liquid which is a pulping liquor and wherein the sensor device measures the amount of NaOH, Na2S, and/or Na2CO3 in the pulping liquor.
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11. A method of inhibiting the formation of scale on an electrode that comprises the steps of:
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immersing the electrode of a sensor device into a liquid being measured; providing a source of an aqueous mixture of scaling inhibitors; and continuously distributing an effective amount of the aqueous mixture of scaling inhibitors into the liquid in the vicinity of the electrode characterized in that scale deposition in the form of salts that are present in the liquid onto the electrode is effectively controlled to permit continuous operation of the sensor device for more than a month without cleaning. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification