Concentration multiple[1-2](concentration times) refers to the ratio of the content of the substance concentrated due to evaporation in the circulating cooling water to the content of the same substance in the make-up water, or the ratio of the make-up water volume to the sewage volume.During the operation of circulating water, the water keeps evaporating. If the concentration of solution exceeds the saturation solubility under the same conditions, salt precipitation will occur. Therefore, the concentration multiple of circulating water has a certain limit.
Chinese name
Concentration multiple
Foreign name
concentration times
Definition
Ratio of make-up water volume to sewage volume
Ratio
Conductivity ratio of circulating cooling water to make-up water
In circulating cooling water, the ratio of dissolved solids concentrated due to evaporation to dissolved solids in make-up water.In actual measurement, usuallyCirculating cooling waterThe ratio of the conductivity value of% to the conductivity of makeup water, or the ratio of [K+][3]。
benefit
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Benefits of increasing the concentration ratio of cooling water:
(1) Increasing the concentration multiple of cooling water can reduce the amount of make-up water and save water resources;
(2) Increasing the concentration multiple of cooling water can reduce the amount of sewage, thus reducing environmental pollution and waste water treatment;
(3) Increasing the concentration multiple of cooling water can save the consumption of water treatment agent, thus reducing the cost of cooling water treatment;
Disadvantages
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Disadvantages of excessively increasing the concentration ratio of cooling water:
If the concentration ratio of cooling water is increased too much, the hardness and alkalinity of cooling water will be too high, and the scaling tendency of water will increase;
Therefore, in order to ensure the treatment effect of cooling water, it is necessary to control the concentration multiple of cooling water. Generally, the concentration multiple of central air-conditioning cooling water is generally controlled at 4-5[2]。
application
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Concentration ratio is an important indicator of industrial circulating water, and chlorideCa2+、Na+、K+Determination, but because chloride ion is artificially added, it is of little practical significance to use chloride ion to express the concentration multiple;In general,CatwoIt is a scaling factor. The circulating water will scale more or less during operation, especially in the case of high concentration ratio, so Ca is usedtwoThe determined concentration multiple will be low;The solubility of K ion in water is quite large, and it will not precipitate during operation. At the same time, K in the make-up water is basically stable, so the concentration multiple determined by K is more accurate.
