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 slurry. Take the slurry pump of shiyi pump industry as an example.High concentration strong abrasion slurry pump can choose AH pump;SP (SPR) pump should be used when the liquid level changes greatly and it is necessary to work under the invading liquid.When high head conveying is required.HH type slurry pump was selected.If corrosive acid slurry pump with DT
2. Selection of performance parameters
After the pump type is determined, the head and flow are the basis for selecting the pump size and whether the pump is in series.High concentration of strong abrasion slurry transport, generally do not choose pump higher revolution nmax(a variety of higher revolution in the performance curve), the choice of revolution around 3/4nmax is appropriate.The selected pump in 3/4 nmax, the flow is appropriate and the head can not reach, can be used in series with multiple pumps.For slurry pump, different slurry, flow range should be limited;For the slurry with high concentration and strong abrasion, the flow rate should be within the range of 40-80% of the flow rate corresponding to the higher efficiency of the pump;For low-concentration abrasive slurry, the flow rate should be selected in the pump higher efficiency corresponding to the flow rate of 40% - range.Generally, it is not selected in the range of -120% of the flow corresponding to higher efficiency.
3. Head allowance
Slurry pump in the process of operation, due to the wear and tear of the flow parts of the pump performance continues to decline, until the final condition can not meet the requirements.In order to make the pump can run for a long time in the rated working conditions near, usually in the selection of pump to increase a head margin.The general allowance is 10% of the rated head.
4. Material selection of over current parts
Slag slurry pump through the flow parts can choose more material, should be based on the transport of slurry in the room (particle composition, particle size, shape, hardness, concentration), chemical (acid, alkali, oil) characteristics and.
5. Selection of shaft seal type
Slurry pump is mainly a filler seal, deputy impeller seal and mechanical seal and other forms of shaft seal.Vice impeller seal is generally used in reverse irrigation work, the pressure of the top management should be less than 10% of the pump outlet pressure, this type of shaft seal without shaft seal water, but the use of vice impeller seal down to increase the power consumption, generally rated power of about 5%.Packing seal need to add shaft seal water, and ensure enough who and water, shaft seal water pressure is equal to the pump outlet pressure plus 35Kpa. Mechanical seal need to add shaft seal water, sealing good, no leakage.
6. Transmission mode
The transmission mode of slurry pump is v-type triangle belt drive, elastic coupling drive, gearbox drive, hydraulic coupler drive, frequency conversion drive device, thyristor speed regulation.Among them, elastic coupling and v-shaped triangle belt are cheap in price, convenient in disassembly and assembly, and should be given priority to.But v-shaped triangular belt will increase the power consumption by 5%.
7. Installation type
Slurry pump has a variety of installation types.CV drive, DCZ drive, CRZ drive and ZVZ drive.
8. Equipped with motor
When the pump shaft power is calculated, the standard motor should have a certain power abundance coefficient when considering the factors such as pump startup and flow fluctuation.Generally, rich system is taken as 1.1 -- 1.2, high power is taken as small value, and low power is taken as large value.