Selection of the absorption tower circulation pump
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1. Flow rate: 100m³； Head: 32 meters. 2. Medium: Ammonium bisulfite solution (pH value 5-6). 3. Temperature: below 50°C. 4. Sealing type of the pump: mechanical seal; cooling is achieved through internal circulation. 5. Motor speed: a four-stage motor is used, which is an explosion-proof motor. 6. Material: The parts in contact with the medium are made of 304 stainless steel. 7. Inlet diameter: 100; outlet diameter: 80. I would like to ask everyone how such parameters should be taken into account when modifying the pump. The two magnetic drive pumps that were used in the past failed after operating for only a short time, experiencing issues such as high current levels, excessive noise, or the shaft getting stuck due to graphite bushings; there are no significant solid impurities in the medium.
As the original poster said, there aren’t many solid particles, but it’s still clear that some particles are present; it is recommended not to use a magnetic pump in such cases. As for the excess current, the shaft power can be calculated based on the specific gravity of the material, thereby determining the size of the motor required.
If there are particles present, it will cause rapid damage to the isolation sleeve; it is recommended to use a lined centrifugal pump
Chemical pumps manufactured by Hangzhou Alkali Pump Factory Co., Ltd. are also equipped with mechanical seals; both four-stage and six-stage motors are suitable for use. The absorbing liquid is sodium bisulfite, with a pH of 5-6. It is best to use 321 or 316L materials for the components that come into contact with the material. Usage experience: It’s very useful.
A regular centrifugal pump can be chosen, equipped with a mechanical seal; if there are solid particles present, hard-to-hard seals should be used for the stationary and rotating rings. External flushing is preferred if possible, otherwise PLAN31 could be considered. The material of the pump itself should be 316L or higher.