Slurry Pump is a kind of general-purpose mechanical equipment with a wide range of applications. It is widely used in petroleum, chemical industry, electric power metallurgy, mining, ship selection, light industry, agriculture, civil and national defense departments, and plays an important role in the national economy. According to statistics in 79, the output of pumps in China reached 1256000 units. The electric energy consumption of pumps accounts for more than 21% of the national electric energy consumption. Therefore, it is of great significance to reduce the energy consumption of the pump.
In recent years, our pump industry has designed and developed many high-efficiency and energy-saving products, which has played a positive role in reducing the energy consumption of pumps. However, at present, in various fields of the national economy, due to the unreasonable selection, many SLURRY PUMPS are in unreasonable operation, low operation efficiency and waste a lot of energy. Some pumps cannot be used at all due to unreasonable selection, or the use and maintenance cost increases and the economic benefit is low. It can be seen that reasonable pump selection is also of great significance to save energy.
Reasonable Slurry pump selection is to comprehensively consider the comprehensive technical and economic indicators such as the investment and operation cost of pump unit and pump station, so as to make it conform to the principles of economy, safety and applicability.
Specifically, there are the following aspects:
1. The requirements of service flow and head must be met, that is, the operation work point of the pump (the intersection of the device characteristic curve and the pump performance curve) must always be maintained in the efficient range, so as to save power and not easily damage the parts.
2. The selected water pump should not only have small volume, light weight and low cost, but also have good characteristics and high efficiency.
3. It has good anti cavitation performance, which can not only reduce the excavation depth of the pump house, but also prevent cavitation of the pump, with stable operation and long service life.
4. The construction of pump station according to the selected pump has the advantages of less project investment and low operation cost.
The necessary parameters for model selection are as follows:
(1) List Basic Data
1. Characteristics of medium: medium name, specific gravity, viscosity, corrosivity, toxicity, etc.
2. The particle diameter and content of the agent contained in the medium.
3. Medium temperature: (℃)
4. Required flow
Generally, the leakage in the pipeline system can be ignored in the process flow of industrial pumps, but the influence of process change on flow must be considered. If the agricultural pump adopts open channel water transmission, the leakage and evaporation must also be considered.
5. Pressure: suction tank pressure, drainage tank pressure, pressure drop in piping system (head loss).
6. Pipeline system data (pipe diameter, length, type and number of pipeline accessories, geometric elevation from suction tank to pressure tank). If necessary, the device characteristic curve shall also be made.
When designing and arranging pipelines, the following matters shall be paid attention to:
A. Reasonably select the pipe diameter. The pipe diameter is large. Under the same flow, the liquid flow speed is small and the resistance loss is small, but the high price and small pipe diameter will lead to a sharp increase in resistance loss, increase the head of the selected pump, increase the matching power, and increase the cost and operation cost. Therefore, it should be considered comprehensively from the perspective of technology and economy.
B. The maximum pressure that the discharge pipe and its pipe joint can withstand shall be considered.
C. The pipeline shall be arranged as a straight pipe as far as possible to minimize the accessories in the pipeline and the length of the pipeline. When it is necessary to turn, the bending radius of the elbow shall be 3 ~ 5 times the diameter of the pipeline, and the angle shall be greater than 90 ℃ as far as possible.
D. The discharge side of the pump must be equipped with valves (ball valves or globe valves, etc.) and check valves. The valve is used to adjust the working point of the pump. The check valve can prevent the pump from reversing when the liquid flows back and prevent the pump from being hit by water hammer. (when the liquid flows back, it will generate huge reverse pressure and damage the pump)
(2) Determine Flow(capacity) & Head(pressure)
1. Determination of flow
a. If the minimum, normal and maximum flow has been given in the production process, the maximum flow shall be considered.
b. If only normal flow is given in the production process, a certain margin shall be considered.
For pumps with large flow and low unintended head with NS > 100, the flow margin shall be 5%. For pumps with small flow and high lift with NS < 50, the flow margin shall be 10%. For pumps with 50 ≤ ns ≤ 100, the flow margin shall also be 5%. For pumps with poor quality and poor operating conditions, the flow margin shall be 10%.
c. If the basic data only give weight flow, it shall be converted into volume flow.
The pump is the power source of the whole process system. It is very important for industrial and mining units to select a slurry pump suitable for their own working environment, high efficiency and energy saving.
The experience is for reference only. If you need to solve specific problems (especially in legal, medical and other fields), you are recommended to consult professionals in relevant fields in detail. D. The discharge side of the pump must be equipped with valves (ball valves or globe valves, etc.) and check valves. The valve is used to adjust the working point of the pump. The check valve can prevent the pump from reversing when the liquid flows back and prevent the pump from being hit by water hammer. (when the liquid flows back, it will generate huge reverse pressure and damage the pump)
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