Causes of excessive pressure drop in plate heat exchangers and their solutions
Source: http://le-signal.com/ Time: 2019-03-01
When the plate heat exchanger is running, if the system piping is not purged normally; the area is too small during selection and the plate surface scale will cause excessive pressure drop due to long running time. How to solve it?
The running system piping, especially the newly installed piping, will have dirt such as welding slag, which enters the Jiangsu plate heat exchanger, which will cause the area of the flow channel to be greatly reduced and the final pressure to be reduced. The direct solution to this problem is to wash away the dirt in the flow channel with a chemical solution. This cleaning method is also suitable for treating the surface fouling of the sheet. When cleaning, generally use a solution containing 0.3 aminosulfonic acid or a solution of 0.8 nitric acid containing 0.3 urotopine, 0.2 aniline, 0.1 methyl thiocyanate as the cleaning solution, and the cleaning temperature should be 40 ° C-60 ° C. The Jiangsu plate heat exchanger can be cleaned directly without removing the dirt. However, it is necessary to install a nozzle on the cold medium inlet and outlet pipes or a cleaning inlet on the medium inlet and outlet piping, and then pass the matched cleaning solution through the nozzle. After soaking it in the equipment for a period of time, it can be washed with water. Remember to ensure that the pH value is greater than 7. When cleaning the plate, it needs to be disassembled and cleaned, soak the plate to be cleaned in the cleaning solution for 30 minutes, then gently brush the scale with a soft brush, and then wash it with water. Avoid damage to the plates and rubber pads during cleaning. It is worth noting that when cleaning fluid is injected, it is necessary to grasp the cycle cleaning time, preferably not more than 15 minutes. When injecting into the Jiangsu plate heat exchanger, the equipment should be injected in the opposite direction of the medium flow, and the medium flow rate should be controlled at 0.05-0.15m / s. If it is used in a central heating system, the method of primary water supply to secondary water can be used. If you choose secondary circulating water, it is better to use softened water, because the suspended solids concentration in the softened water is less than 5mg / L, the diameter of impurities is less than 3mm, and the pH value is greater than 7, which is not easy to be on the surface Scaling.
If the area of the Jiangsu plate heat exchanger is too small, it will cause too high flow velocity between the plates and cause a large pressure drop. To avoid excessive pressure drop, you should choose a suitable area.
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