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First, the selection step
a) List the basic data:
1, the required flow
2, medium temperature: (°C)
3. The particle diameter and content of the body contained in the medium.
4, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity and so on.
5, pressure: suction tank pressure, drainage tank pressure, pressure drop in the piping system (head loss).
6. Pipeline system data (pipe diameter, length, type and number of pipeline accessories, geometry elevation from suction tank to pressure pool).
If necessary, device characteristics should also be made.
When designing layout pipelines, note the following:
A. The discharge pipe and its fittings should take into account the maximum pressure that can be tolerated.
B, pipe layout should be arranged as straight as possible, to minimize the attachment in the pipe and minimize the length of the pipe, the bend radius must be 3 to 5 times the pipe diameter, the angle should be greater than 90 °C.
C. The discharge side of the pump must be equipped with valves (ball valves, globe valves, etc.) and check valves. The valve is used to adjust the operating point of the pump, and the check valve prevents the pump from reversing when the liquid is flowing backwards, and prevents the water hammer from hitting the pump. (When the liquid flows back, it will generate a huge back pressure and damage the pump)
D. Reasonably select the pipe diameter, the pipe diameter is large, the flow rate is small, the resistance loss is small under the same flow, but the high price and the small pipe diameter will lead to a sharp increase of the resistance loss, which will increase the lift of the selected pump. With increased power, costs and operating costs have increased. Therefore, it should be considered from a technical and economic point of view.
b) Determine the flow head
Determination of traffic
a. If the basic data only gives weight flow, it should be converted into volume flow
b. If only normal flow is given in the production process, consider leaving a certain margin.
c. If the minimum, normal, and maximum flow rates are given in the production process, the maximum flow rate should be considered.
Second, the selection principle
The pump is a general-purpose mechanical device with a wide range of applications. It is widely used in petroleum, chemical, power metallurgy, mining, ship selection, light industry, agriculture, civil and national defense departments, and occupies an important position in the national economy. According to statistics from 79 years, China's pump production reached 1.256 million units. The electric energy consumption of the pump accounts for more than 21% of the national electric energy consumption. Therefore, reducing the energy consumption of the pump is very significant and it is of great significance to save energy.
In recent years, our pump industry has designed and developed a number of highly efficient energy-saving products, such as IHF, CQB, FSB, UHB and other types of pump products, which have played a positive role in reducing the energy consumption of pumps. However, at present, in various fields of the national economy, due to unreasonable selection of models, many pumps are in an irrational state of operation, are inefficient in operation, and waste a lot of energy. There are also pumps that are unreasonable in terms of their type selection and cannot be used at all, or the use of maintenance costs increases and the economic efficiency is low. It can be seen that the rational selection of pumps is also of great significance for energy conservation.
The so-called rational pump selection is to comprehensively consider the comprehensive technical and economic indicators such as investment and operating costs of the pump unit and the pump station, so as to meet the principles of economy, safety, and application. Specifically, there are the following aspects:
Must meet the requirements of the use of flow and lift, that requires the pump operating point (device characteristics curve and the pump performance curve of the intersection) are often maintained in the efficient range of operation, so that not only save power and not easy to damage the parts. The selected water pump must be small, light, and inexpensive, and must have good characteristics and high efficiency. It has good anti-cavitation performance, which can not only reduce the excavation depth of the pump room, but also prevent the pump from cavitation. The operation is stable and the service life is long. According to the selected pump construction pump station, the project investment is less, the operation cost is low.
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