Have You Mastered These Five Methods Of Slurry Pump Flow Regulation?

Five methods to regulate the flow of the slurry pump:

1. Exit throttling flow regulation This is one of the more common flow regulation methods.Closed some valves of any form on the outlet pipe will add a system pressure head, so the system pressure head curve will intersect the slurry pump pressure head curve at a small flow rate.The throttling at the outlet moves the operating point to a lower efficiency point and there is a power loss at the throttle valve.Throttled to the dead point may cause liquid in the pump to overheat, bypasses may be used to maintain the necessary minimum flow rate, or different adjustment devices may be used.

2. Adjust the throttling flow rate at the suction inlet.Then some power can be saved by throttling in the suction pipe.Since outlet throttling will cause liquid to overheat or vaporize, jet engine fuel slurry pumps often use inlet throttling.At small flow rates, the impellers of these pumps are only partially filled with liquid.Therefore, when the outlet is throttling, the flow rate of the condensate pump with an input power and temperature rise of about 1/30 of the full operating position of the impeller is usually controlled by the immersion depth, which is equivalent to the inlet throttling.This particular design can reduce cavitation damage from these pumps to a minor extent, but the energy levels also become quite low.

3. Adjust bypass adjustment

All or part of the flow can be diverted from the discharge pipeline of the slurry pump and directed to the suction port of the pump or other suitable points through the bypass pipe.One or more flow orifices and suitable control valves may be installed in the bypass.Metering bypass is usually used to reduce the flow of the boiler feed pump, mainly to prevent overheating.A considerable power saving can be saved if the excess flow of the bypass propeller pump is used instead of the outlet throttle.

4. Speed \u200b\u200badjustment of flow rate adjustment

When adjusting the flow rate in this way, the required power can be reduced and overheating can be eliminated during the flow rate adjustment process.Steam turbines and internal combustion engines can easily adapt to speed adjustment at a very small additional cost.Various mechanical, magnetic, hydraulic transmissions, as well as DC and AC variable speed motors can be used to adjust the speed.Usually, variable speed motors are too expensive and can only be adjusted with adjustable blades when they have been proven to be worth it in special circumstances.After studying the adjustable guide vanes installed in front of the impeller, it was found that this method is effective in adjusting the pump at a specific speed of 5700 (2.086).The blades can produce forward pre-rotation, thereby reducing the indentation head, flow rate and efficiency.However, relatively small adjustment effects can be achieved only through the blades.With the constant change of the indenter and relatively small efficiency loss, a larger flow rate variation range can be obtained.

5. Flow regulation and gas replenishment

Supplying air to the suction port of the slurry pump is also a method to regulate the flow rate. Throttled flow can save some power compared to the outlet.Generally speaking, air is not desired in the conveyed liquid. Too much air is always at risk of causing the pump to lose the filling head, so this method is rarely used in practice except in a few occasions.