Method for minimizing corrosion, scale, and water...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/00 (2006.01)

Patent

CA 2730920

This invention is an improved process for operation of evaporative recirculating cooling systems. In addition to reducing the scaling and corrosive tendencies of the water, the method eliminates or reduces discharge from the system without creating any localized corrosive or scaling conditions as a result of the treatment process. The described measurement and control system generally comprises an array of measurements, a means of implementing control logic, and an array of control actions including activating an ion exchange device to treat makeup water. The measurements can include of physical measurements of flow rates, chemical measurements of water composition, and performance-related metrics such as water corrosiveness or scaling tendency. Preferably, the measurements include one or more of pH, conductivity, hardness, alkalinity, corrosiveness, scaling tenden-cy, treatment additive dosage level, and treatment additive residual of the makeup, treated makeup, and recirculating water.

La présente invention concerne un processus amélioré dutilisation de systèmes de refroidissement par évaporation à recyclage. En plus de réduire les tendances à lentartrage et à la corrosion de leau, le procédé élimine ou réduit les décharges provenant du système sans créer aucune condition de corrosion ou dentartrage localisée du fait du processus de traitement. Les mesures décrites et le système de commande comprennent généralement un ensemble de mesures, des moyens de mise en uvre de la logique de commande, et un ensemble dactions de commande incluant lactivation dun dispositif à échange ionique pour traiter leau dappoint. Les mesures peuvent comporter des mesures physiques de débits, des mesures chimiques de la composition de leau, et une métrique liée à la performance, comme la corrosivité ou la tendance à lentartrage de leau. De préférence, les mesures comportent une ou plusieurs mesures sélectionnées parmi le pH, la conductivité, la dureté, lalcalinité, la corrosivité, la tendance à lentartrage, le niveau de dosage dadditif de traitement, et les résidus dadditif de traitement de leau dappoint, de leau dappoint traitée et de leau recyclée.

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