一, the basic parameters: the basic condition, the capacity and head
1, through the working condition of first determine whether using slurry pump, the working condition of this understanding as an industry, etc., such as mineral processing, coal, sand, etc. (this step is very important, is also do type of work)
2, flow, head is the most basic of two parameters: the selected pump
A general idea, through the working condition of the primary pump, such as which series models or consider material, etc
B, to determine the pump series model, through traffic, head read performance curves, to determine the specific type and size of the pump.
C, read, computing power, the shaft of the pump power calculation must know parameters including flow, lift, efficiency, slurry density; Efficiency (eta) by flow, lift, found out by reading performance curve; Slurry share customer cannot provide only through experience. Generally between (1-2), will give an estimate technology to calculate the power.
D, calculation of shaft power P = m * g * h/eta its export type: P = rho * Q * h / 102 eta (should be pay attention to the safety coefficient in the calculation of actual use)
E, calculate the motor power, through the shaft power take its recently and larger than the shaft power of the motor power as the ultimate power.
二, more parameters: working condition, flow, lift, slurry density, solid density, concentration, Ph, temperature, etc
According to (1) the basic process of, only in steps (c) the slurry density parameters provided by the customer value directly, or through a solid density and the concentration to calculate the slurry density.
Weight concentration of the slurry main consideration of the degree of abrasion, specific pulp, the higher the concentration of abradability is relatively higher for certain, slurry density at the same time also will be higher. So there will be a heavy, neutral, points of light slurry pump (is according to the content of slurry is roughly for such a concept, no strict boundaries).
Ph value is our judgment is one of the material factors in selection of pump flow components (usually 5-12 of the Ph value is considered metal flow range, the rest of the range consider using rubber or other special material, here is a theory of digital can't die set, flexible application to);
Temperature is one of the factors to determine whether material can be used, general temperature mostly is seldom considered, but also sometimes have special condition for temperature requirements.
三, detailed parameters, operating mode, flow, lift, slurry density, solid density, concentration, Ph, temperature, D50, D80, pipe, pipe, elbow, valve, gradually (shrinkage, expansion tube), viscosity, etc
Is still in accordance with the basic process of (a), but in this kind of detailed parameters, are generally not bidding project, or the client is very professional, can provide more detailed parameters. In general can provide to the parameters of (son) is detailed. Some big projects, the tender will have special design units or departments to provide a detailed data, so we may provide (3) the level of detail. The detailed parameters is mainly to increase the line ways, and the pipeline is calculated TDH (dynamic head) parameters, usually a lot of customers to provide detailed line, or a simple line, so all ignore, directly provide a head, we don't have to calculate, but once the detailed line, we need to calculate itself TDH, concrete calculation of TDH is relatively complex, but there are ready-made formula to paraphrase (here) are introduced. |