Monitoring boiler internal treatment with fluorescent-tagged polymers
AssigneeNalco Chemical Company
InventorsJoseph C. Alfano, Martin R. Godfrey, Radhakrishnan Selvarajan, Mary C. Uhing
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Abstract
A method for the determination of the concentration of additives in boiler water systems, by which polymeric additives are utilized to monitor and treat boiler water systems.
Claims18
A method of determining boiler cycles of concentration in a boiler water system containing an anionically charged water soluble boiler water treatment polymer, there being a source of a feedwater stream to the system as a first system parameter, a source of a blowdown stream from the system as a second system parameter, as well as a source of the soluble polymer in the boiler water as a third system parameter, and wherein the soluble polymer undergoes a hydrothermal reaction at boiler water system operating conditions, and the soluble polymer contains at least 0.01% mer units of spectrophotometrically emitting moieties bound to the polymer chain, the method comprising the steps of:
- a. adding the soluble polymer to a feedwater stream entering the boiler water system;
- b. measuring at least one spectrophotometric characteristic of the soluble polymer contained in a sample of the feedwater stream;
- c. allowing at least a portion of the soluble polymer to hydrothermally react into a reaction product as the soluble polymer passes through the boiler water system;
- d. measuring at least one spectrophotometric characteristic of the remaining soluble polymer and measuring at least one spectrophotometric characteristic of the reaction product contained in a sample of the blowdown stream;
- e. converting each of the measured characteristics to electrical signals corresponding the concentration of the soluble polymer in the feedwater stream, the concentration of the remaining soluble polymer in the blowdown stream, and the concentration of the reaction product in the blowdown stream, respectively;
- and,
- f. using the concentration of the soluble polymer in the feedwater stream, the concentration of the remaining soluble polymer in the blowdown stream and the concentration of the reaction product in the blowdown stream to determine the boiler cycles of concentration of the boiler system.
A method for spectrophotometrically monitoring a soluble polymer recovery value in a boiler water system containing an anionically charged water soluble boiler water treatment polymer, there being a source of a feedwater stream to the system as a first system parameter, a source of a blowdown stream from the system as a second system parameter, as well as a source of the soluble polymer as a third system parameter, and wherein the soluble polymer passes through the boiler water system under boiler water system operating conditions, and the soluble polymer contains at least 0.01% mer units of spectrophotometrically emitting moieties bound to the polymer chain, the method comprising the steps of:
- a. adding the soluble polymer to a feedwater stream of the boiler system;
- b. allowing at least a portion of the soluble polymer to hydrothermally react into a reaction product as the soluble polymer passes through the boiler water system;
- c. measuring at least one spectrophotometric characteristic of the remaining soluble polymer and at least one spectrophotometric characteristic of the reaction product in a sample of the blowdown stream;
- d. converting each of the measured characteristics to electrical signals corresponding to the concentration of the remaining soluble polymer in the blowdown stream and the concentration of the reaction product in the blowdown stream, respectively;
- and,
- e. using the concentrations of the remaining soluble polymer in blowdown stream and the concentration of the reaction product in the blowdown stream to determine the soluble polymer recovery value within the boiler water system.
Dependencies are inferred from the claim text.