water cooler
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Dear sea friends: I have a question – what is the appropriate temperature range for the water chiller to cool the materials? That is, what should be the appropriate temperature of the material entering the cooler in order to prevent scaling on the tubes of the water cooler? We have 3 heat exchangers here; the inlet temperature of the material is around 180–200 degrees, while the outlet temperature is about 30–60 degrees. These 3 heat exchangers are prone to scale formation that can block the tube bundles, although their heat exchange area is sufficient. Thank you.
The temperature range for cooling the material using water-cooled exchangers is generally kept below 160°C; the inlet temperature of the material is around 180–200 degrees, while the outlet temperature is about 30–60 degrees. These three exchangers are prone to scale formation that can lead to blockages in the tube bundles, so it is recommended to use air cooling first and then water cooling.
Adding chemicals to the cooling water in the cooling tower to prevent scaling is the simplest method.
If the temperature of the material is too high, scaling is likely to occur; it’s better to first use another cooling medium to lower the material’s temperature a bit, and then using circulating water will work better.
An inlet temperature of 180°C makes it entirely possible to carry out heat recovery; with such a large temperature difference, using ordinary quality circulating water would surely cause problems in the structure. It is recommended to add heat exchange equipment and replace the circulating water with higher quality water
In a circulating water system, scale is formed by supersaturated water-soluble components. Various salts are dissolved in water, such as bicarbonates, carbonates, chlorides, and silicates. Among these, the dissolved bicarbonates like Ca(HCO3)2 and Mg(HCO3)2 are the most unstable and readily decompose to form carbonates. Therefore, when there is a high concentration of dissolved bicarbonates in the cooling water, the water flowing over the surface of the heat exchanger, especially the areas with higher temperatures, will decompose due to heat. When phosphates and calcium ions are present in the water, calcium phosphate precipitates will form as well. Calcium carbonate and Ca3(PO4)2 belong to salts with low solubility; their solubility does not increase as temperature rises, but rather decreases with rising temperature. Therefore, on the heat transfer surface of the heat exchanger, these insoluble salts can easily reach a supersaturated state and crystallize in the water. Especially when the flow rate of water is low or the heat transfer surface is rough, these crystalline deposits accumulate on the heat transfer surface, forming what is commonly known as scale. Due to their dense and hard structure, these scale deposits are also referred to as hard scale. Common components of scale include calcium carbonate, calcium sulfate, calcium phosphate, magnesium salts, and silicates.
Is it possible to use 180-degree heating of the raw materials to reduce energy consumption?
The 180°C heat was not applied to the pinch point, what a shame! !
Make reasonable use of these 180 degrees – you can save a lot of resources. Adding a heat exchanger is a good idea; it also prevents scaling
Purely physical special multi-alloy technologies for scale prevention, scale removal, and corrosion inhibition can be considered; WeChat ID: *mi59