Screwconveyor drive motor sizing
1. your material.
Calcium powder known as limestone dust is a very light - sluggish material, midely abrasive tends to aerate and become uncontrolable fluid.
2. your screw conveyor.
For a horizontal U through conveyor (not feeder) of 10" screw you need a housing of 11" MAX. Supposing you have no intermediate bearing and a regular screw, you need a 6" centeral pipe. With a 30% loading your capacity will be 91 cubic - feet per hour (3 metric tone per hour).
since you have a 35 deg. inclenation you will have a 20% efficiancy wich means 0.6 metric tone per hour. because the large clearence and the material tendcy to aerate and flow back your real capacity will be 0 (ZERO) metric tone per hour.
You need no drive motor for this capacity.
3. improve your screw conveyor.
You may use the existing U through as a base for your improved conveyer and change \ replace the screw only. It's preferable to take an all new half pitch circular through screw conveyer. Supposing the existing through is a 12" sch 10 the inner diameter will be 314.7mm. A new screw with a diameter 12" (304mm) with a 6" pipe and half pitch screw will give a capacity of 5 metric tone per hour at 75 rpm for 30% load and 35 deg. inclination.
Use a 5.5 HP (4 Kwatt) motor.
You have to control the feeding to the screw conveyor.
For further info. you may contact me at : email@example.com
Ludan engineering LTD.