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Operation skills for flow regulation of slurry pump
Slurry pumps play an important role in industrial applications, especially when dealing with liquids containing solid particles. It is crucial to adjust the flow rate of the slurry pump reasonably in order to meet the needs of different working conditions. The following are several common methods and operating techniques for regulating the flow rate of slurry pumps:
1. Export throttling regulation
Operation technique: Control the flow rate by adjusting the opening of the valve installed on the discharge pipeline. This method is simple and reliable, but has high power loss and poor economy.
Caution: Partially closing the outlet valve will increase the system pressure head, causing the operating point to move to a lower efficiency point and potentially causing the fluid inside the pump to overheat. Therefore, caution should be exercised when using this method to avoid excessive throttling.
2. Variable speed adjustment
Operation technique: Adjust the flow rate by changing the impeller speed. Variable frequency drives, hydraulic couplings, or other variable speed devices can be used to adjust the speed of motors or driving equipment.
Advantages: This method has minimal additional power loss and is one of the most economical ways.
Initial investment: Additional configuration of variable speed mechanism and variable speed motor is required, resulting in higher initial costs.
3. Bypass regulation
Operation technique: Separate some or all of the flow from the discharge pipeline and guide it back to the suction port or other suitable location through a bypass pipe. Flow orifice plates and control valves can be installed in the bypass to accurately manage the diversion flow.
Applicable scenario: Suitable for solving the problem of continuous operation of slurry pumps under low flow conditions.
Disadvantages: The diversion flow is not fully utilized, which increases additional energy loss and process pipeline complexity.
4. Cut the outer diameter of the impeller
Operation skills: Cut the outer edge of the impeller according to the requirements to reduce its diameter, thereby reducing the flow rate.
Restrictions: Once the cutting is completed, the impeller size cannot be restored and can only be adjusted towards a smaller flow direction; Meanwhile, the range within which the impeller can be reduced is limited.
Best use: Suitable for long-term low traffic situations with little change in traffic.
5. Replace the impeller
Operation technique: Replace the original components with impellers of different diameters or outlet widths to achieve the purpose of regulating flow rate.
Advantages and limitations: Although the power loss is relatively small, multiple specifications of impellers need to be prepared, and the adjustment range is also limited.
6. Block part of the impeller flow channel
Operation technique: Reduce flow output by blocking certain impeller channels (usually even numbered).
Energy saving effect: Compared to traditional valve throttling, it is more energy-efficient because it is an active regulation method that can reduce additional energy consumption.
7. Adjust the blade outlet angle
Operation technique: Changing the outlet angle of the impeller blades to affect the flow characteristics is commonly used for axial flow pumps.
Practical application: This method has been proven effective for specific designed pumps, such as pumps with a specific speed of 5700 (2.086).
8. Cavitation regulation
Operation technique: By changing the inlet pressure (such as water level height or suction valve setting), controllable cavitation phenomenon can be triggered, thereby changing the working characteristic curve of the pump.
Potential risk: Although proper use of cavitation can automatically regulate flow and reduce energy consumption, improper control may cause damage to overcurrent components.
9. Increase or decrease the number of running pumps
Operation skills: Increase or decrease the number of slurry pumps put into operation according to actual needs, and combine appropriate combination strategies to achieve flexible control of overall flow rate.
Flexibility: This method is particularly suitable for large-scale systems when a single pump cannot meet the requirements of the entire process flow.
Each of the above methods has its unique advantages and limitations. When selecting a specific solution, factors such as operating conditions, economic costs, and maintenance convenience should be comprehensively considered. Correctly mastering these operational techniques can help users better manage and optimize the performance of slurry pump systems.
This article originates from https://www.fuyangpumps.com/news/442.html. Please indicate the source when reprinting.
(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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