【Daily Question】Chemical Engineering Principles 319: Generators (February 15)

Currently, the main operating methods for the internal cooling water systems in generators in our country are: the copper corrosion inhibitor addition method, the small mixed-bed treatment method, and the frequent water replacement method. All three operating modes have their own technical drawbacks, which are detrimental to the safe and economical operation of the generator. There have been instances where poor quality of the internal cooling water led to the burning of the generator’s copper bars or forced the generator to operate at reduced capacity. 1) Copper corrosion inhibitor addition method: It is difficult to meet the standard requirements for both the pH value and conductivity of the internal cooling water; the water quality is unstable, with a high copper content. The corrosion inhibitor reacts with copper ions to form deposits, and since copper corrosion inhibitors are insoluble in water, they tend to precipitate within the system and cause blockages in the tubes and rods. 2) Mixed-bed treatment method: The pH value of the effluent is low, resulting in a weakly acidic environment that does not meet the standard requirements; this leads to severe corrosion of copper wires, with corrosion products tending to accumulate. 3) Frequent water change method: This results in a large amount of desalinated water being wasted, and the low dissolved oxygen level and low pH value of the desalinated water make it easy for copper wire rods to corrode.

1) Copper corrosion inhibitor addition method: It is difficult to meet the standard requirements for both the pH value and conductivity of the internal cooling water; the water quality is unstable with high copper levels. The corrosion inhibitors form complexes with copper ions, which can lead to deposition, and since copper corrosion inhibitors are insoluble in water, they tend to precipitate within the system and cause blockages in the wires and rods. 2) Mixed-bed treatment method: The pH value of the effluent is low, resulting in a weakly acidic environment that does not meet the standard requirements; this leads to severe corrosion of copper wires, with corrosion products tending to accumulate. 3) Frequent water change method: This results in a large amount of desalinated water being wasted, and the low dissolved oxygen level and low pH value of the desalinated water make it easy for copper wire rods to corrode.

Currently, the main operating methods for the internal cooling water systems in generators in our country are: the copper corrosion inhibitor addition method, the small mixed-bed treatment method, and the frequent water replacement method. All three operating modes have their own technical drawbacks, which are detrimental to the safe and economical operation of the generator. There have been instances where poor quality of the internal cooling water led to the burning of the generator’s copper bars or forced the generator to operate at reduced capacity. 1) Copper corrosion inhibitor addition method: It is difficult to meet the standard requirements for both the pH value and conductivity of the internal cooling water; the water quality is unstable, with a high copper content. The corrosion inhibitor reacts with copper ions to form deposits, and since copper corrosion inhibitors are insoluble in water, they tend to precipitate within the system and cause blockages in the tubes and rods. 2) Mixed-bed treatment method: The pH value of the effluent is low, resulting in a weakly acidic environment that does not meet the standard requirements; this leads to severe corrosion of copper wires, with corrosion products tending to accumulate. 3) Frequent water change method: This results in a large amount of desalinated water being wasted, and the low dissolved oxygen level and low pH value of the desalinated water make it easy for copper wire rods to corrode.

What are the reasons for substandard cooling water in generators? Currently, the main operating methods for the internal cooling water systems in generators in our country are: the copper corrosion inhibitor addition method, the small mixed-bed treatment method, and the frequent water replacement method. All three operating modes have their own technical drawbacks, which are detrimental to the safe and economical operation of the generator. There have been instances where poor quality of the internal cooling water led to the burning of the generator’s copper bars or forced the generator to operate at reduced capacity. 1) Copper corrosion inhibitor addition method: It is difficult to meet the standard requirements for both the pH value and conductivity of the internal cooling water; the water quality is unstable, with a high copper content. The corrosion inhibitor reacts with copper ions to form deposits, and since copper corrosion inhibitors are insoluble in water, they tend to precipitate within the system and cause blockages in the tubes and rods. 2) Mixed-bed treatment method: The pH value of the effluent is low, resulting in a weakly acidic environment that does not meet the standard requirements; this leads to severe corrosion of copper wires, with corrosion products tending to accumulate. 3) Frequent water change method: This results in a large amount of desalinated water being wasted, and the low dissolved oxygen level and low pH value of the desalinated water make it easy for copper wire rods to corrode.

1) The demineralized water or condensate does not meet the standards； 2) The dosage of the additive is inappropriate ； 3) System defects, cooling water contamination ； 4) The system was not flushed before being put into operation.

What are the reasons for substandard cooling water in generators? Answer: The reasons for substandard cooling water in the generator are: 1) Substandard demineralized water or condensate water ； 2) The dosage of the additive is inappropriate ； 3) System defects, cooling water contamination ； 4) The system was not flushed before being put into operation.

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1) The saline water or condensate water is not up to standard; 2) The dosage of chemicals used is inappropriate; 3) System defects and contamination of the cooling water; 4) The system was not flushed before being put into operation.

Currently, the main operating methods for the internal cooling water systems in generators in our country are: the copper corrosion inhibitor addition method, the small mixed-bed treatment method, and the frequent water replacement method. All three operating modes have their own technical drawbacks, which are detrimental to the safe and economical operation of the generator. There have been instances where poor quality of the internal cooling water led to the burning of the generator’s copper bars or forced the generator to operate at reduced capacity. 1) Copper corrosion inhibitor addition method: It is difficult to meet the standard requirements for both the pH value and conductivity of the internal cooling water; the water quality is unstable, with a high copper content. The corrosion inhibitor reacts with copper ions to form deposits, and since copper corrosion inhibitors are insoluble in water, they tend to precipitate within the system and cause blockages in the tubes and rods. 2) Mixed-bed treatment method: The pH value of the effluent is low, resulting in a weakly acidic environment that does not meet the standard requirements; this leads to severe corrosion of copper wires, with corrosion products tending to accumulate. 3) Frequent water change method: This results in a large amount of desalinated water being wasted, and the low dissolved oxygen level and low pH value of the desalinated water make it easy for copper wire rods to corrode.

1. Dissolved oxygen in demineralized water; 2. Low pH value; 3. High copper content.