Generally, the causes of imbalance of the impeller of the negative pressure fan in use can be divided into two types: the wear of the impeller and the scaling of the impeller. These two situations are related to the dust removal device connected in front of the induced draft fan. The cause of the imbalance of the impeller caused by the dry method is mainly wear, and the cause of the imbalance of the impeller caused by the wet method is mainly scaling. Ningbo air cooler, Ningbo air cooler

As long as this happens, blade-like wear is formed at the blade exit. For the impeller wear caused by dry dust removal, in addition to improving the dust removal effect of the dust collector, the most effective method is to improve the wear resistance of the impeller. As a result, the operating costs of the negative pressure fan and the entire production system are reduced, and the overall benefit is very good. Analysis and solution of imbalance of impeller of negative pressure fan

协 The association force between these oxide scales and the surface of the impeller is not even. Some oxide scales will fall off automatically under the action of vibration or centrifugal force, which is also a cause of the imbalance of the impeller. A more practical solution is the thermal spraying technique, which uses special methods to change materials such as wear-resistant and high-temperature-resistant metals or ceramics into high-temperature and high-speed particle flow, and sprays it onto the surface of the blade of the impeller to form a layer of material than the impeller itself. Super-strong outerwear with abrasion resistance, high temperature resistance, and oxidation resistance.

湿度 The humidity of the flue gas purified by the wet dust removal device is very high. Although the dust particles that have not been removed are small, the viscosity is very large. When the departmental ash falls off under the combined effect of centrifugal force and vibration, the balance of the impeller is destroyed, and the entire induced draft fan will vibrate. Although this will increase the cost of manufacturing or maintaining the impeller, it will increase the service life of the impeller by 2 times and extend the overhaul period of the induced draft fan. Impellers that are not treated by thermal spraying during use can be considered for thermal spraying of the impellers during equipment maintenance.

Dry type dust removal device can remove most of the large particles of dust in the flue gas, but a small number of large particles and many small dust particles along with high temperature and high speed smoke through the induced draft fan, subject the blades to continuous washing. When selecting the induced draft fan, the dry dust removal should preferably use the impeller treated by thermal spraying. Because this wear is irregular, it causes the imbalance of the impeller. This can not only reduce the damage caused by the impeller's dynamic balance, but also reduce the imbalance caused by the oxide layer. When they pass through the induced draft fan, they will be adsorbed on the non-working surface of the blade under the action of the gas, especially at the entrance and the exit of the non-working surface, which will form severe dust fouling and gradually thicken.