Cooling Water System

Chemco is proposing for a comprehensive treatment program for the cooling water system covering specific problems that are expected of the cooling water system.

Corrosion

Corrosion is a natural phenomenon where metals return to their natural oxide state. Carbon steel is among the easiest metal to corrode but due to the economic it is also the most common metal used in the industry. Corrosion in the cooling water system can be of many categories. It can be of general flash corrosion due to the natural presence of anode and cathode, under deposit corrosion underneath deposition, crevice corrosion, galvanic corrosion, and microbiologically induced corrosion.

The method chosen for corrosion control is mainly based on the make-up water chemistry. If the make-up water is considered soft or low in calcium, the corrosion inhibitors selected will generally be of inorganic types. It either can be a low concentration of zinc or molybdate, which is not classified as heavy metal combined with organic and inorganic phosphate. In the absence of calcium, these inhibitors are readily capable of providing sufficient protection.

In the presence of high hardness water, corrosion inhibition selection will generally favor the full application of inorganic and organic phosphate or organic phosphate alone. In the presence of calcium corrosion inhibition means will be provided with a minimal potential of scales formation.

Scales and Deposit

Certain minerals form scales when their solubility in water is exceeded. Calcium carbonate, calcium phosphate, and excess corrosion inhibition layer are common scales in the cooling water system besides iron and siliceous matters. Deposits are the precipitation of the mineral scales and sedimentation of suspended matters that can be of corrosion products, silt, debris, organic matters, and ash.

Scales generally will for a hard deposit that can inhibit proper heat transfer while deposition of suspended matters from soft to hard sludge that restrict water flow as well as initiate sites for corrosion.  In the industry, most of the severe corrosion cases are under deposit corrosion. The inhibition of scale formations involved the chemistry of phosphonate and acrylate/acrylamide compounds. Organophosphorous provides inhibition for calcium carbonate scales formation while acrylate and acrylamide compounds provide protection against other scales as well as deposition of suspended matters.

Chemco also has patented amide molecules for deposit control applications. The hydrophobic and hydrophilic properties of this molecule have enabled excellent penetration and dispersion of, especially organic deposit and slime masses.

Microorganism

Microorganisms such as algae, fungi, and bacteria are common to the cooling water system causing problems from as simple as plugging the distribution holes to microbiologically induced corrosion (MIC). Problem with algae and fungi is limited to cooling tower structure but bacteria with species such as pseudomonas, galleonella, desulfurvibrio, and Nitrobacter among others are known to create problem either by forming slime masses or causing pitting corrosion.
To control the activities of these microorganisms, besides introducing oxidizers such as sodium hypochlorite, a broad spectrum of non-oxidizing biocide is also recommended.

Selections normally will be made based on the unique individual plant needs.

Cooling Water Concern in Utility Operation

In a power plant operation where rapid steam condensation is required to provide a sufficient vacuum for steam turbine operation,   the cooling efficiency of condenser is very vital.  To ensure this,  many treatment programs have been developed over the years to minimize mineral scaling potential as well as deposition of suspended solids.

  • It is a blend of corrosion, scale and fouling inhibitors
  • It is a formulation of organophosphorous compounds, threshold agents, polyacrylates, triazoles and a copolymer designed to minimize hardness of cooling water
  • Protects metal surfaces and keeps cooling water clean
  • Does not require acid dosing nor does it use traditional inhibitors like Phosphates and Zinc
  • It is a formulation of organic and inorganic compounds, threshold agents, polyacrylates, triazoles with a low level phosphate residual
  • Assures high corrosion inhibition against all metals
  • Prevents scale and fouling thereby keeping the system clean
  • It is a blend of scale and corrosion inhibitors
  • It is a formulation of organic and inorganic compounds, threshold agents, polyacrylates, triazoles and a low level Zinc salt
  • It is thermally stable and under normal operating conditions can be used over a wide range of temperatures
  • It is a liquid polymeric product used to remove scale and act as a dispersing agent
  • It coagulates small particles of dust, dirt, silt and mud for easy removal by bleed-off
  • It is a broad spectrum microbicide based on a blend of polyquarts
  • Highly effective against the growth of algae, bacteria and fungi
  • Completely soluble in water and compatible with most treatment programs
  • Effective in acid and alkaline systems as well as in the presence of iron and other metallic contaminants.
  • It is a highly effective biocide specially formulated to inhibit the growth of algae, bacteria and fungi
  • Completely soluble in water and compatible with most treatment programs
  • Cleans not only the visible portion of the equipment but also the piping valves and spray nozzles inside

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