Water Ring Vacuum Pump Selected in Paper Industry

Vacuum pumps in paper industry include 2BV series water ring vacuum pumps, SPECK of Germany and Atlas of international brands. In recent years, under the condition of laboratory stations, 2BV series water ring vacuum pumps have been tested to achieve the highest efficiency of pumping dry air, while screw vacuum pumps will be more efficient in pumping humid air in paper mills, which directly saves power costs for manufacturers. The efficiency of the liquid-ring vacuum pump introduced by many relevant data of water-ring vacuum pump is only 35%~50%. Obviously, these data can not keep up with the new changes brought by the new technology.

2. Select low-speed water ring vacuum pump.

When choosing vacuum pump, water ring vacuum pump with low speed should be selected as far as possible. It is better to choose the corresponding speed at the end of the impeller blade when the linear speed is below 18 m/s. At this time, the efficiency of the pump is usually higher. Of course, relative to the higher speed of the pump will pay more purchase costs, relative to the cumulative increase in energy consumption, in the context of increasing emphasis on energy saving, it is obviously worthwhile to choose low-speed energy-saving products.

3. Reasonable combination of vacuum pump points.

Vacuum points with similar vacuum degree and space position should be combined together, and a large vacuum pump should be used to suck. The combination should be considered to be conducive to pipeline layout. The combination should distinguish the functional areas. Pumps with diaphragms can be selected when the air volume is similar and the vacuum degree is different. For example, pumps with diaphragms can be selected between suction boxes of upper and lower blankets and between different vacuum suction rollers.

4. The combined air volume of vacuum pump should be converted.

Because the gas is compressible, the volume of the gas expands when the high-pressure gas is reduced to the low-pressure gas. If it is necessary to combine the high vacuum chamber and the low vacuum chamber of the vacuum roller, the vacuum degree and the gas volume of the high vacuum chamber are -65 kPa and 80 m3/min respectively, and the vacuum degree and the gas volume of the low vacuum chamber are -40 kPa and 50 m3/min respectively, then the gas volume of the low vacuum chamber should be converted to - 65 kPa, and the gas volume of the low vacuum chamber should be 84.4 m3/min ((101.3-40)/(101.3-65) x50=84.4), then the gas volume of the pump should be 164.4 m3/min. Rather than choosing a pump with 130 m3/min gas volume.what-is-a-vacuum-pumps

5. Pipeline should be considered.

The gas pumped from each vacuum element will flow in the pipeline with a certain pipeline loss, which will cause the pressure drop and volume expansion of the gas. In the case of reasonable design of pipeline size, the loss of pipeline can be 2-3 kPa (small value for high vacuum and large value for low vacuum).
6. Temperature correction should be appropriate.

Because the air pumped by the pump on the paper machine is wet air with higher temperature, and the working fluid of the water ring vacuum pump has higher water temperature because of various restrictions, which is different from the working condition calibrated on the performance curve of the water ring vacuum pump. Therefore, the temperature and water temperature need to be corrected. When the temperature is higher and the water temperature is lower, the corrected air volume will be smaller, and the corrected air temperature will be selected. Vacuum pumps are also smaller. The specific temperature to be corrected depends on the parameters of the paper machine and the specific conditions of the paper mill. Usually, it is feasible to take the temperature of 45 C and water temperature of 35 C to correct. The corrected results are safe and reliable.
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