Electrolytic scale removing device “WET” lowers the scale component concentration in cooling water by forced precipitation of scale components in water through electrolysis in the tank (separating and taking out solid components in liquid) as installed on the route of cooling water/makeup water.
Installation of “WET” is highly advantageous because adhesion of scale to the inside of the equipment causes many troubles.
The following graphs give a water quality comparison between the cooling water the scale components of which have been concentrated by a cooling tower for a certain period of time and treated by “WET” for 5 days and that without “WET” treatment under the same conditions.
By removing scale, the consumption of water treatment chemicals and makeup water are reduced, which will lead to cost reductions.
“WET” is not just a device that removes components causing contaminants in water and prevents adhesion of new contaminants. It also has the effect of inducing the elution of already-adhering scale by lowering the scale component concentration in water.
By removing scale, the consumption of water treatment chemicals and makeup water are reduced, which will lead to cost reductions.
Necessary running cost is only a slight electricity charge.
Maintenance is to simply perform periodic cleaning inside the tank every three months to one year.
Managers and operators require little effort.
We have heard from many satisfied companies in which “WET” has been actually installed.
Here we introduce an installation example.
Company A – Water-cooled experimental facilities –
Company A with many water-cooled experimental facilities had a problem of scale adhesion because of concentration operation while refraining from the use of water treatment chemicals with consideration given to the local environment.
As a measure against this, “WET” was installed.
・Verification through water quality analysis
Through the analysis of water quality with “WET” installed in one of the two cooling water systems of the experimental facilities, we obtained the results as shown in the following graph.
Both of the cooling towers had a capacity of 100RT and they were about the same in load status.
It can be seen that the electrical conductivity rose gradually, and the water quality worsened with time in the cooling water system without “WET.”
You can see from the graph that there was no rise in electrical conductivity in the cooling water system with “WET” (the influence of load increasing in summer was taken into consideration), where the worsening of water quality could be retarded.
Apparently obvious effect
The following photographs show the conditions of heat exchanger tubes before and after installation of “WET.”
Previously (left), scale was adhering as much as some heat exchanger tubes were blocked, but about half a year after installation (right), the adhesion status was significantly improved.
In this user’s case, one cooling water system covers multiple oil coolers.
The image on the left shows the state of a heat exchanger before installation of WET. We can see contaminants as much as some heat exchanger tubes are blocked.
Conventionally, a rise in oil temperature by a decrease in thermal efficiency would be a problem.
The image on the right shows the state of a heat exchanger under periodic maintenance that was performed half a year after installation of WET.
Although a simple comparison cannot be made because the heat exchangers are different, a clear difference in contamination was confirmed.
This result was highly regarded, and WET was installed in all cooling water systems within the operation site to realize nonchemical water quality control.
