How to calculate the concentration ratio of circulating water using conductivity
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This post was last edited by rockleepj on 2011-3-21 at 13:13. I would like to ask the experts how to calculate the concentration ratio of circulating water in oil refining plants using conductivity. What is the formula for this? In practical analysis, how often should samples be taken for testing, and which specific parameters need to be analyzed? Are there any standards for such calculations?
Circulating water conductivity/Replenishing water conductivity = Concentration factor. What is your unit? Is it a water treatment company or a chemical plant? We analyzed PH, conductivity, alkalinity, calcium ions, total iron, as well as the main components of the chemicals used
Using conductivity to determine the concentration factor is only an approximate value, and using it to guide the operating parameters of circulating water can lead to problems. The concentration factor is generally determined using an ion that is not easily affected by external changes; for example, using K ions provides a more accurate result.
It is inaccurate to determine the concentration factor using conductivity; generally, calcium ions or chloride ions are used
To be precise, it should refer to the salinity of the circulating water/salinity of the make-up water; later on, this was changed to chloride ions in the circulating water/chloride ions in the make-up water, or potassium ions in the circulating water/potassium ions in the make-up water. Once scaling occurs in the circulating water, its calcium ions and alkalinity tend to decrease, which in turn leads to errors in the concentration ratio.
The analysis parameters include pH, turbidity, conductivity, calcium ions, alkalinity, chloride ions, total phosphorus, total iron, oil content, or COD, etc. The specific indicators shall be determined based on the makeup water, concentration ratio, properties of the chemicals used, and the conditions of the on-site process, in accordance with the requirements of the national standard GB50050—2007.
The concentration factor should be considered in combination with several indicators
Generally, it is not determined based on a single indicator; instead, comprehensive considerations are given to total alkalinity, total hardness, calcium hardness, chlorine, and salt content
Our unit calculates it by dividing the conductivity of recycled water by that of fresh water
Based on the data you have measured, the concentration factor can be determined using conductivity and chloride ions