Water Ring Vacuum Pump Unit of Cavitation Analysis

Once the water ring vacuum pump unit is affected by cavitation, it will not only seriously lose the service life of the equipment, but also make the equipment unable to operate normally. Therefore, when the equipment is found to be cavitating, the cause must be found out and handled in time.

1. Water ring vacuum pump unit operates at full load for a long time; In summer, the cooling water temperature is high or the cooling water flow is too small, resulting in poor cooling effect of the heat exchanger. The water ring vacuum pump will operate under high vacuum, which is equivalent to operating close to or in a suffocated state;

2. Due to the inherent physical phenomenon, under the condition of a certain water temperature, the higher the vacuum, the higher the water temperature, the water in the pump is close to boiling and will produce a large number of bubbles. The generation and rupture process of bubbles will cause cavitation damage to the impeller, destroy the dynamic balance of the impeller, cause strong vibration of the pump body, damage the auxiliary equipment of the vacuum pump, and produce very large cavitation noise, These conditions seriously affect the safe operation of water ring vacuum pump unit and steam turbine generator unit;

3. To solve the problem of cavitation, the cost of reducing the water temperature is large, and reducing the vacuum degree is even more impossible, which will seriously affect the load capacity of the unit. The ideal way is to solve the generation of cavitation when the original water temperature and system vacuum remain unchanged;

4. At present, the better choice is to install an atmospheric ejector on the feed ring vacuum pump unit, and the whole steam extraction performance will be better. Therefore, the vacuum of the condenser can still ensure the current level or higher, but the internal vacuum is only 12kpa (at this time, the system vacuum is within the range of 3-8kpa), which can effectively avoid cavitation.

If cavitation occurs in the water ring vacuum pump unit, we should deal with it differently according to different situations. Therefore, before solving the problem, we should first learn to judge what causes cavitation easily, and then apply the remedy to the case.