Is it necessary to keep the sewage pipe of the water cooling tower at a certain opening degree?
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The waste water discharge pipeline of the water cooling tower here is constantly in operation, which causes the makeup water valve to open more widely. As a result, circulating water at a higher temperature enters the water cooling tower, leading to very high temperatures in it. This in turn increases the load on the chiller and results in wasted energy consumption. I would like to ask whether the discharge valve of everyone’s water cooling tower is kept at a certain opening level at all times, or is it opened occasionally to remove the dirt from the bottom.
If the quality of the circulating water is good, it is recommended to discharge water intermittently; of course, the bottom of the air-cooled tower also needs to be drained intermittently~~
I hope to sketch out the process flow simply. I’m sorry for my ignorance – I didn’t understand the process you described. Where does all the waste water go?
If it keeps being discharged, will the temperature of the system rise further? I still don’t understand this
This is to prevent water from crystallizing out, right? Just reduce the opening degree
The water supply volume to the water cooling tower before and after opening the drain is different; assuming that the amount of nitrogen-containing waste entering the water cooling tower remains unchanged, the temperature of the water flowing into the low-temperature water pump increases relatively after the drain is opened. In fact, as long as the chiller load is sufficient, there is no need to worry about the outlet temperature of the air-cooled tower. Of course, when the water quality is good, it is recommended to discharge water intermittently; air-cooled towers require such discharge even more~~
Preventing cold scale or crystallization is mainly to avoid sudden flow interruptions; it is believed that setting the lower temperature limit too low is the issue~~
Personal opinion: 1. If this is done to prevent crystallization due to too low outlet temperature, it increases energy consumption; adjustments should be made to the ice machine rather than to the water volume. 2. If wastewater discharge is a concern, it is recommended that the person in question take the opportunity to open the manhole during maintenance – they will then realize that it basically serves no purpose. The connection of the sewage pipe inside the tower is not at the very bottom, unless the water quality there is really very poor. I have done work on draining water from cooling towers before; after opening the manholes for inspection, it turned out that the sludge never reached a height sufficient to reach the drainage outlet. 3. Take water samples at the outlet of the sewage discharge valve, or at either the inlet or outlet of the circulation pump; a simple filtration through filter paper in the laboratory will determine whether sewage discharge is necessary. 4. Regarding the drainage from air-cooled towers, a few more words are needed on this topic. The access hatches on air-cooled towers are opened many times; what accumulates in them is not sludge, so this issue can basically be ignored (it can be determined based on regional conditions and air quality, or it can also be attributed to the water discharged from cleaning the air compressor impellers). The main issue with air-cooling towers is the scaling of the air distribution pipes; this is something that really requires attention. Whenever there is an opportunity for maintenance, the manholes should be opened to clean off the scale
The purpose of draining water from a water-cooled tower is not to remove waste, but rather to reduce the accumulation of salts in the tower. There is no need to drain water from an air-cooled tower, as there is no waste material there at all; scaling mainly occurs on the baffle plates.