Discussion: What is the concentration factor for 2,000 liters of circulating water per hour?
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This post was last edited by hesonchang214 on 2009-8-15 at 12:11. I’ve read some materials on how to increase the concentration ratio in circulating water systems; in some cases, this ratio can be raised to 6.0 or even 8.0. However, the volume of circulating water in those systems is usually in the tens of thousands of cubic meters per hour, while in my plant, the volume is only 2,000 cubic meters per hour, resulting in a concentration ratio of between 1.5 and 2.0. I wonder, fellow experts, what is the volume of circulating water and the concentration ratio in your facilities? What is the maximum concentration ratio that can be achieved for a plant of our scale? Thank you. :lol
The level of concentration multiplication depends on factors such as the conditions of the factory, the quality of local water, and the availability of local water sources; it’s not the case that only large factories can achieve a high level of concentration, while small factories cannot. Due to the large volume of water circulation in large plants, a high concentration ratio can reduce the amount of water that needs to be added, thus saving a significant amount of water resources. It is very suitable for water-scarce areas. However, high concentration ratios require the use of larger amounts of water treatment chemicals, as well as corresponding auxiliary facilities such as acid addition systems and various supporting systems; otherwise, high concentration ratios can lead to scaling. In fact, after the concentration ratio reaches 5, increasing it further does not result in a very significant water savings, but the treatment cost increases significantly; therefore, a concentration ratio of 3–5 is the most appropriate.
This post was last edited by li*ch1968 on 2009-8-14 at 20:02. The original poster made it clear that the concentration factor should be determined based on the local water quality; for a system with a capacity of 2000, I think it would be ideal to increase this factor to around 3.5 times if the water quality is good. But sometimes, due to water quality issues, it is not possible to reach this level – either the structure tends to be too large or it is not economical. You can send me your water quality report to take a look.
This post was last edited by nanshanan on 2009-8-15 06:05: pH 7.5, total iron >0.3mg/L, turbidity
Hehe, the circulation rate is similar to that of my unit. Previously we could keep it at 4-4.5; after the recent maintenance and resumption of operations, with the side filter being backwashed once a day and continuous rain reducing evaporation, the concentration ratio is now between 3-3.5.
This post was last edited by hesonchang214 on 2009-8-15 at 12:17. What is concentration, and how to achieve it? Experts, please advise
The circulating water concentration ratio refers to the degree to which the circulating cooling water becomes more concentrated over time during operation, due to factors such as water evaporation and wind-induced losses (compared against the amount of make-up water used); it is an important comprehensive indicator for assessing the quality of water control. The concentration ratio is low, resulting in high water consumption and wastewater discharge, as well as inadequate utilization of the water treatment chemicals ； A high concentration ratio can reduce water usage and save on water treatment costs ； However, if the concentration ratio is too high, the tendency of water to form scale increases, making it more difficult to control scaling and corrosion. Water treatment chemicals become less effective, and it becomes harder to control microorganisms; therefore, there needs to be a reasonable limit for the concentration ratio of circulating water. There are many methods for detecting the concentration ratio. Due to differences in the quality of make-up water and the operating conditions of circulating water across various plants, the results obtained using different methods vary. Therefore, it is necessary to compare the methods used for measuring the concentration ratio of circulating water. ?① As the concentration ratio increases, both the make-up water volume M and the wastewater discharge volume D in the cooling water system continue to decrease. Therefore, increasing the concentration ratio of circulating water can save water resources. ② The percentage reduction in the amount of water required for supplementation per unit increase in the concentration factor [(ΔM/R)/ΔK] decreases as the concentration factor increases; at lower concentration levels, the water-saving effect of increasing the K value is more significant ； However, when ?K? is increased above 4.0, the water-saving effect of further raising the concentration ratio becomes less significant; for example, when it is raised from 4.0 to 5.0, the water saved accounts for only 0.11% of the circulating water volume. Therefore, it is advisable to keep the concentration ratio of circulating cooling water systems between 2.0 and 4.0.
The water quality stabilizers used in our factory include sodium hexametaphosphate TS-604A, HEDP (C2H8O7P2), and thiazole-based compounds; liquid chlorine is also used for disinfection. Do anyone have any better formulations? Because I feel that the concentration ratio of my plant is a bit low. Our plant currently uses a manual method for adding chemicals; is it necessary to switch to using a chemical pump for this purpose? Is this beneficial for increasing the concentration factor?
As discussed by those above, the concentration factor for recirculated water depends entirely on the quality of the water used for supplementation. In a project I’m working on currently, the concentration factor has reached 8 times, with a water flow rate of 18,000 t/h. Generally, it’s also around 4 times.
3# a16898 The hardness of the water you are adding is too high. Is it groundwater?
It still has a lot to do with the operating environment; our factory has reached 5.0