Selection of water ring vacuum pump _ papermaking industry

1, use energy-saving water ring vacuum pump.

now constant to the company the development should be in the papermaking industry of the vacuum pump has 2 bv series water ring vacuum pump and the German brand SPECK and atlas three international brand, in recent years, 2 bv series water ring vacuum pump under the condition of experiment stations, measured water pump dry air can reach the highest efficiency of 67%, used in paper mill and screw vacuum pump suction wet air will have a higher efficiency, directly for the manufacturer to save power cost. Introduce a lot of water ring vacuum pump related information of liquid ring vacuum pump efficiency is only 35% ~ 50% efficiency, obviously the data fail to keep up with the new technology bring new changes.

2, choose low speed water ring vacuum pump.

when choosing a vacuum pump, should as far as possible choose low rotate speed of water ring vacuum pump. It is best to choose the end of the impeller's blade linear velocity under 18 m/s when the corresponding rotational speed, the efficiency of the pump is usually higher at this moment. Relative to choose high speed water pump, of course, will pay more to purchase cost, and more energy consumption relative to accumulate over a long period, in the context of the growing emphasis on saving energy and reducing consumption, obviously with low speed energy-saving product is worth it.

3, each vacuum pump some reasonable combination.

vacuum and space position close vacuum points should be grouped together, with a larger vacuum pump suction, combination should be considered for piping layout, combination shall be the difference between each function, similar in volume, the vacuum pump with partition can be used at the same time, for instance, between the fleece of suction box up and down, can choose between different vacuum move roller with diaphragm pump.

4, vacuum pump combination gas should be reduced.

because gas is compressible, high pressure gas reduced pressure to low pressure gas when the gas volume expansion will happen. If the vacuum coucher must be of high vacuum chamber and low vacuum chamber, high vacuum degree of vacuum chamber and gas - respectively 65 kpa and 80 m3 / min, the low vacuum degree of vacuum chamber and gas - respectively Kpa 40 and 50 m3 / min, then should be first to convert the low vacuum chamber volume to - 65 kpa at the time of the gas, the gas conversion for 84. 4m3/min( ( 101. 3 - 40) /( 101. 3 - 65). ×50 = 84。 4) , then choose the pump volume should be 164. 4 m3 / min, rather than the volume of 130 m3 / min air pump.

5, vacuum pump selection should consider the pipe.

from the suction vacuum components of gas flow in the pipe line loss, can be used for this part of the line loss will cause the gas pressure is reduced, the volume expansion. In line size under the condition of reasonable design, line loss may take 2 ~ 3 kpa ( Take small value high vacuum, low vacuum take large value) 。

6, vacuum pump temperature correction should be appropriate.

because pump suction gas on the paper machine is high temperature moist air, and water ring vacuum pump working liquid due to various constraints, the water temperature is higher, the water ring vacuum pump performance curve calibration condition is different, so the need for temperature, water temperature, when the temperature is higher, the water temperature is lower, the correction of volume will be relatively small, to select the vacuum pump is small, specific what to take temperature correction should with the parameters of the machine and the specific conditions of the mill, usually take temperature 45 ℃ and 35 ℃ for water temperature correction is feasible, the corrected result is safe and reliable.

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