Reasonable selection of slurry pump is one of the key factors to improve the service life of the pump. Reasonable selection of slurry pump includes several main aspects, such as reasonable selection of pump type, performance parameters, material of over-current components, sealing type and transmission mode.
1. Selection of pump type
There are many types of centrifugal slurry pumps. Different types of pumps should be selected according to the properties of the slurry. Taking Warman pump as an example, the L-type pump can be used for low-abrasive slurry with a weight concentration of less than 30%; The slurry pump can choose the AH type pump; when the liquid level changes greatly and needs to intrude into the liquid to work, the SP (SPR) type pump should be used. When high lift conveying is required. Choose ZGB type pump.
2. Selection of performance parameters
After the pump type is determined, the head and flow are the basis for selecting the size of the pump and whether it is connected in series. When conveying high-concentration and strong abrasive slurries, it is generally not necessary to select the maximum number of revolutions of the pump, nmax (the highest number of revolutions of various revolutions in the performance curve). When the selected pump is at 3/4 nmax, the flow rate is appropriate but the lift cannot be reached, and multiple pumps can be connected in series. For Warman pumps, the flow range of different slurries should also be limited; for high-concentration and strongly abrasive slurries, the flow rate should be within the range of 40-80% of the flow rate corresponding to the maximum efficiency of the pump; for low-concentration abrasive slurries, The flow rate should be selected within the range of 40%-100% of the flow rate corresponding to the highest efficiency of the pump. Generally, it is not selected in the range of 100%-120% of the corresponding flow rate of the highest efficiency.
3. Head flow
During the operation of the slurry pump, the performance of the pump continues to decline due to the wear of the overcurrent components, until it finally fails to meet the requirements of the working conditions. In order to make the pump run near the rated working condition for a long time, a head margin is usually added when selecting the pump. The general allowance is 10% of the rated lift.
4. Material selection of overcurrent parts
There are many materials that can be used for the flow parts of the slurry pump, which should be determined according to the characteristics of the room (particle composition, particle size, shape, hardness, concentration) and chemical (acid, alkali, oil) of the conveying slurry.
5. Selection of shaft seal type
Slurry pumps mainly include shaft seals such as packing seals, auxiliary impeller seals and mechanical seals. Auxiliary impeller seals are generally used in reverse irrigation, and the pressure of the high-pressure pipe should be less than 10% of the pump outlet pressure. This type of shaft seal does not add shaft seal water, but the use of auxiliary impeller seals reduces power consumption, generally about 5% of the rated power. . The packing seal needs to add shaft seal water, and ensure enough water and water. The shaft seal water pressure is equal to the pump outlet pressure plus 35Kpa. The mechanical seal needs to add shaft seal water, with good sealing performance and no leakage.
6. Transmission mode
The transmission mode of the slurry pump includes V-shaped V-belt transmission, elastic coupling transmission, gear reduction box transmission, hydraulic coupling transmission, variable frequency drive device, and thyristor speed regulation. Among them, elastic coupling and V-shaped V-belt are cheap and easy to disassemble and assemble, so they should be used first. But the V-belt will increase the power consumption by 5%.
7. Installation type
Slurry pumps are available in a variety of installation styles. CV transmission, DCZ transmission, CRZ transmission and ZVZ transmission.
8. With motor
When the pump shaft power is calculated, considering factors such as pump start-up and flow fluctuation, a certain power margin factor should be selected when selecting a standard motor. Generally take the rich system as 1.1-1.2, take the small value for high power, and take the large value for low power.
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