Choosing a plate heat exchanger – difficult to determine the material when water quality is complex?
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Cold source: Water flow rate: 2.7 m3/h. The water contains Na+: 3830 mg/l, Ca2+: 200 mg/l, Mg: 30.4 mg/l, SiO2: 44.3 mg/l, F-: 30.5 mg/l, Cl-: 4553 mg/l, NO3-: 304.5 mg/l, CODcr: 284 mg/l. TDS is calculated at 9177 mg/l. PH: 6~8) ； The temperature was increased from 20°C to 60°C. Heat source: Water flow rate: 2.55 m3/h (TDS is calculated at 1000 mg/l; the water is essentially clean). PH: 6~8) ； The temperature is considered to be 71°C. The pressures of the cold and hot sources are considered to be 0.4 MPa. In the water used as the cooling source, the concentrations of F- are 30.5 mg/l and those of CL- are 4553 mg/l; both values are quite high, which means they pose a significant corrosive threat to the plates. Is it suitable to use 316 material in this case? Still need a titanium plate? The levels of other ions are high: Na+: 3830 mg/l, Ca2+: 200 mg/l, Mg: 30.4 mg/l, SiO2: 44.3 mg/l. Are there any special requirements for the channels in plate heat exchangers? Can ordinary plates be used?
Due to the presence of chloride ions, 316L is not suitable; I’ve seen experimental results indicating that Baosteel’s water tank plates work well.
Haven’t heard of it; 316 won’t work, so it’s better to use titanium plates.
It’s best to run another test to see the scaling situation. The water quality is too complex; the scaling isn’t severe, so a regular plate heat exchanger will suffice
Also, if there are small particulate solids present, a wide-channel plate type can be chosen as well
Hello, I am a manufacturer of plate heat exchangers. If you have any needs, feel free to contact me at QQ3225774384
The material should be titanium. As for the flow channels, it depends on the size of the soluble substances. We have a variety of plate designs available, with plate spacing ranging from 2 MM to 7 MM, and equivalent diameter ranging from 4 MM to 14 MM; there is definitely a design that suits your requirements. If you’re interested, my QQ number is 3225774384
F-: 30.5 mg/l, CL-: 4553 mg/l. In such conditions, 316L steel definitely won’t work; Ti may or may not work either, as there are F- ions present. I don’t have any data to determine whether it’s suitable under these conditions of F- ion concentration, pH, and temperature