Dirt blockage of common failures of plate heat exchanger maintenance_
In the process of repairing the 746 plate heat exchanger, the fault problem is still more complicated. One of the common fault problems is the fouling of the plate heat exchanger. I believe that many users have encountered such a clogging problem, so what is good? Ways to solve this problem, through the plate heat exchanger maintenance experience, we have summarized the following prevention and solution of the problem of plate heat exchanger blockage. Plate heat exchangers have played an increasingly important role in the industrial and civil markets due to their light weight, small footprint, high heat exchange efficiency, and flexible assembly. However, due to the narrow gap of the plate heat exchanger and the small flow cross-sectional area, when high-temperature water or media with fibers and particles pass through, it is easy to scale or cause blockage, which reduces the heat exchange efficiency of the plate heat exchanger and affects the exchange rate. Safe and normal operation of the heater. Therefore, how to quickly and effectively clean the plate heat exchanger to prevent the formation of scale and blockage is very important. Cleaning method for civil fouling and process blockage of plate heat exchanger 1. Flushing: Before pickling, open the heat exchanger to be flushed so that there are no impurities such as mud and scale inside the heat exchanger, which can improve pickling The effect can also reduce the acid consumption of pickling. 2. Pour the cleaning liquid into the cleaning equipment, and then pour it into the heat exchanger. 3. Pickling: statically soak the heat exchanger filled with acid solution for 2h, and then continuously and dynamically cycle for 3-4h, during which the positive and negative cleaning is performed alternately every 0.5h. After the pickling is finished, if the pH of the acid solution is greater than 2, the acid solution can be reused, otherwise, the acid solution should be diluted, neutralized and drained. 4. Alkaline washing: After the pickling is finished, prepare it with NaOH, Na3PO4, and softened water in a certain proportion, and use dynamic circulation to carry out alkaline washing of the heat exchanger to achieve acid-base neutralization, so that the heat exchanger plates are not Corroded again. 5. Water washing: After alkaline washing, use clean softened water to repeatedly rinse the heat exchanger for 0.5h to thoroughly rinse the residue in the heat exchanger. 6. Record: During the cleaning process, the time of each step should be strictly recorded to check the cleaning effect. Measures to prevent fouling of plate heat exchangers are to strictly control the water quality during operation. The water in the system and the softened water in the softening tank must be strictly tested for blocking water quality before being injected into the pipe network after being qualified. In the heating system, the decontamination device and filter should be cleaned irregularly, and the pipe network should be kept clean to prevent the heat exchanger from clogging. Use a reasonable filtering device to ensure that the water particulate content entering the heat exchanger is lower than the particle diameter requirement of the plate heat exchanger. Choosing a reasonable way to clean and prevent clogging of the plate heat exchanger is an important guarantee for the normal operation of the heat exchanger production.