As a compact and efficient heat exchanger, the plugging heat exchanger is mostly used in complete equipment, and has a good economic benefit. It is mainly composed of plate, gasket, fixed head, movable head clamping bolt, guide rail, column, etc. it has the advantages of compact volume, heat transfer efficiency, and convenient cleaning and maintenance. But the heat exchanger also encountered various problems in the process of use. The gap between the flow passage of 1 block plate heat exchanger is small (2.5-6mm), and particles with diameter greater than 1.5-3mm are easy to block the plate channel, which makes the pressure drop of the equipment deteriorate sharply, which leads to the greatly reduced heat exchange capacity of the equipment due to the blockage, which seriously causes the continuous production interruption of the device. Because of the large amount of impurities in circulating water, similar devices e208/e209 have been blocked many times, which causes frequent shutdown of the device, which has a certain impact on the economic benefits of the enterprise. Later, before e208/e209, a filter was added to ensure the long-term operation of e208/e209. Therefore, the coarse filter or backwash device can be set at the inlet of medium according to the needs to effectively prevent the plate heat exchanger from blocking. 2 scaling will lead to the reduction of heat transfer coefficient, and in serious cases, the plate channel can be blocked. The plate heat exchanger and plate are designed with sufficient supporting medium. The medium acts as disturbance and support, which is limited to solid impurities and fibers. Its side effect is that the fluid forms local concentration and generates dirt, and accumulates the table attached to the table attached to the appropriate temperature of calcium magnesium ions easy to exhale, which is like honeydew drop in the honeycomb. Jam and dirt are formed in different influences, but in plate heat exchanger the phenomenon is the same. The following countermeasures can be taken: (1) the dirty or easily scaling environment should not be used for the heat exchanger (unless other effective measures are added)（ 2) The cooling medium shall be softened with uncooled water, and the operating temperature shall be controlled at 50 ℃ or lower to avoid sensitive temperature of calcium and magnesium ions precipitation. The cleaning method of heat exchanger after a period of operation, a layer of white scale is attached to the inner and outer walls of the heat exchanger. The main reason for the formation of scale is that the water contains calcium and magnesium salts with less solubility. This kind of salt is common in nature, and its dissolution temperature increases, which becomes difficult and capable. Once the existing salt and heat exchanger can produce the following consequences. 1. The scale has poor thermal conductivity, which is 30-50 times smaller than that of steel, and the existence of scale will make the heat transfer of the heating surface worse, so that the heat transfer surface can not reach the ideal temperature drop. According to the relevant data, the experiment shows that 1mm thick scale is produced, and the efficiency of heat exchanger will be reduced by about 10%.