Five main factors affecting the function of vacuum pumps

1. The influence of internal leakage: During the whole molten steel treatment process, the vacuum degree of the system is continuously increased with the reduction of the outgassing amount of molten steel. In the early stage of molten steel treatment, the vacuum degree of the system is low and the gas release volume is large, which requires a large pumping capacity of the backing pump. Usually, multiple pumps are connected in parallel to increase the pumping capacity of the system. And when the vacuum degree of the system continues to increase, the air release volume of the system will also decrease. In order to reduce the steam consumption and save energy, it is necessary to turn off several of the back-stage parallel pumps.

2. The influence of steam: the vacuum pump we use is a steam eruption vacuum pump, which uses supersaturated water vapor as the working medium, and the state of the steam has a decisive impact on the performance of the pump. Wet steam not only affects the function of the pump, but also corrodes the steam nozzle, increases the steam consumption of the pump, and makes the working condition of the pump unstable.

3. The influence of condensed water: Condensed water plays an insignificant role in multi-stage vacuum pumps. In order to ensure that condensed water can fully condense steam, the partial pressure of water vapor in the discharge pressure of the vacuum pump must be higher than its corresponding full vapor pressure. Therefore, the temperature of the condensed water should be lower than the saturation temperature under the pressure to ensure the normal operation of the pump body.

4. The influence of the structure of the pump body: For a single-stage vacuum pump, the part that is easy to wear is the nozzle of the steam. After the nozzle is worn, it will not only affect the performance of the pump, but also increase the operating cost of the system.

5. Impact on the environment: The impact on the environment mainly refers to the pollution of the system by the pumped gas. During the liquid steel disposal process, the molten steel will release a lot of gas, and some small particles such as fine oxide powder will be sucked into the vacuum pump. These small particles will accumulate and adhere to the pump body, reducing the flow conductance of the pumping pipeline, prolonging the pumping time, and reducing the pumping performance of the pump.