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86 15188770013
The influence of different working conditions on slurry pumps
Operating conditions refer to the working conditions of power equipment under certain conditions, that is, the interrelationships between various parameters. The operating conditions of the slurry pump depend on three factors: the performance of the slurry pump, the performance of the pipeline, and the water level difference in the inlet and outlet water tanks. Any change in any factor will change the operating point of the slurry pump accordingly, and the operating point of its device is actually moving within a considerable range. For example, when water flows through the vicinity of water pipes and pipelines, there will be a certain amount of resistance loss, resulting in the actual head of the slurry pump being generally 10% -20% lower than the total head, and the water output will correspondingly decrease.
Operation adjustment methods under different working conditions
flow regulation
Regulating valve adjustment: Install a regulating valve on the discharge pipeline of the slurry pump, and adjust the flow rate by switching the regulating valve. This method is simple and reliable, but it has high power loss and poor economy, and the effect of adjusting small flow or low flow is not good.
Variable speed regulation: Adjust the flow rate by changing the speed of the slurry pump impeller. This method has low additional power loss and is relatively economical, but it requires the addition of a variable speed mechanism and a variable speed motor, resulting in a relatively high initial investment cost. Various mechanical, magnetic, hydraulic transmission devices, as well as DC and AC variable speed motors can be used for speed regulation.
Bypass regulation: By using a bypass to regulate the flow rate, the problem of continuous operation of slurry pumps with low flow rates can be solved. However, the diversion flow rate cannot be fully utilized, resulting in additional losses and a corresponding increase in process pipelines.
Cutting the outer diameter of the impeller: By cutting the outer diameter of the impeller to adjust the flow rate of the slurry pump, the power loss is small, but the impeller cannot be restored after cutting, that is, the flow rate can only be adjusted in the direction of small flow rate. Moreover, the cutting volume of the impeller is limited, and the flow adjustment range is limited. It is suitable for situations where it needs to work under small flow rate for a long time with little change in flow rate.
Replacing impellers: The flow rate of the slurry pump can be adjusted by replacing impellers with different diameters or outlet widths, resulting in low power loss. However, impellers of various diameters are required, limiting the range of flow rate adjustment.
Blocking part of the impeller passage: By blocking the impeller passage (even number) to reduce the flow rate, it is equivalent to throttling and adjusting the outlet valve, but it is an active regulation to reduce additional energy loss, which is more energy-efficient than throttling and adjusting the valve.
Adjusting the blade outlet angle: By changing the outlet angle of the impeller blades, the flow rate of the slurry pump can be adjusted. This method is commonly used in axial flow pumps.
Cavitation regulation: By changing the inlet pressure (water level, suction valve) of the slurry pump, cavitation is generated, and the characteristic curve of the slurry pump is changed, thereby changing the flow rate of the slurry pump. Practice has proven that if cavitation adjustment is used properly, the damage to the overcurrent components of the slurry pump is not severe, and the flow rate can be automatically adjusted to reduce the power consumption of the slurry pump.
Increase or decrease the number of pumps: Adjust the flow rate by increasing or decreasing the number of slurry pumps in operation and using appropriate combination methods.
Head adjustment
When the actual head does not match the required head, the head can be indirectly affected through the above-mentioned methods of adjusting the flow rate. For example, in variable speed regulation, when the speed is reduced, the flow rate decreases and the head will also decrease accordingly; When the speed is increased, the flow rate increases and the head also increases. At the same time, the pipeline system can also be inspected to reduce unnecessary resistance losses, such as cleaning debris inside the pipeline, optimizing pipeline layout, etc., in order to improve the actual head.
Power regulation
When selecting the matching power, you can choose according to the power indicated on the label. In order to make the slurry pump start quickly and use safely, the power of the power machine can also be slightly higher than the required power of the slurry pump, generally about 10% higher. During operation, adjust the flow rate and head reasonably according to the actual working conditions to avoid the pump running in the low efficiency zone and reduce power consumption. For example, when the flow demand is low, using methods such as cutting the outer diameter of the impeller or variable speed adjustment can enable the pump to operate under more suitable conditions and reduce power loss.
Precautions for operation adjustment
In terms of safety
Ensure personal safety and avoid contact with moving parts of pump trucks and pumping stations.
Do not operate during the movement of the pump truck to prevent accidents.
During operation, it is prohibited to turn on the concrete pump to prevent spraying or leakage.
Equipment maintenance aspect
Without authorization, the parameters of the slurry pump shall not be adjusted arbitrarily.
Regularly maintain and upkeep the slurry pump, such as checking the filter screen and filter of the slurry pump, cleaning up accumulated mud, to ensure the reliability of the equipment and extend its service life.
If excessive vibration or abnormal noise is found in the slurry pump, it should be stopped immediately for inspection.
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(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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