Do you believe the conveyor would transport up 10 degrees if the material was dearated? Have you allowed the conveyor to stop, then wait for a likely dearation time, say 5 minutes, and then soft start to see if it will then transport up the incline?

If this works, then a possible solution is a non-aerating transfer chute.

Need help? ■

Will you share the conveyor geometry and operating particulars?

Are you loading on an incline of 10.5 degrees?

What is the tonnage? My guess is about 330 t/h if running at 3 m/s or about 110 t/h for each multiple of 1 m/s.

Can you try a very slow speed (~0.5 m/s) to give the product time to settle as an experiment in de-aeration? ■

DEAR Anil m

When you are loading cement particularly when hot on belt or pipe conveyor angle of inclination at loading point shuld not be more than 5 degree.

At loading point pipe conveyor is similar to conventional conveyor. We have installed many conveyors in cement plants and found if angle of inclination at loading point more than 5 degree cement fludises/dearated

In case your angle of inclination is 10 degree at loading point you have to correct it

for cement conveying you have to keep speed betweem 1 -1.5 m/sec

A R SINGH ■

Dear Sir,

Low speed would help.Probabally, entrapped air in fluidised cement may be cousing the blockage and back flow. Low speed would help in deairating the cement. Please let us know the capacity and length of conveyor for more analysing.

a.k.dewan ■

Anim:

You asked a question and sought assistance. Your question could not be answered as shown by the many questions put to you. As a courtesy, either claim you have been helped and need no further assistance, or provide the answers to those who wish to assist.

Questions and answers in this forum do help many more than the responding individuals.

Hope you find what you seek. ■

It is common practice to aid the discharge of cement by means of aeration, transport via air slides and free fall down steep chute, but these practices invariably presents the material at the point of delivery in a highly dilated and virtually fluid condition. To get the cement to pass up an inclined conveyor without running back it is essential to load the material in a settled condition. It is usually best to do this in a feed hopper of mass flow extraction that has sufficient surface area and depth to enable the back flow of gas to well exceed the flow velocity at any point and provide the residence time for excess air to escape from the voids. Such a hopper requires expert design to generate a relatively even draw-down profile over an extended length of belt contact and almost certainly means priming the system with a controlled feed into the hopper, as cement in a fluidised state will just flush away. The conveyor then must have a variable drive to act as a controlled rate feeder that matches the input in order to maintain the working depth of cement in the hopper. The hopper will probably need to be fitted with a de-aeration frame if it is not of sufficient cross section to achieve natural de-aeration within the space available. I will be presenting a paper at Bulk Asia 2005 in Mumbia in Nov, that includes a typical hopper design of this type. Meanwhile, if you care to send details of the current arrangement to lyn@ajax.co.uk I will be pleased to review the situation. ■

Dear sir

In this case problem is of different nature cement is loaded on conveyor having 10.5 degree inlination and running at higher speed.

I have seen during recent years pipe mnufactured have supplied pipe conveyors for handling cementin 2/3 plants Without reviewing hot cement properties.

In such cases hot Cement is loaded on conveyor having more than 10 degree inclination at tail end .

under such condition conveyors are not giving desired capacity

A R SINGH ■

OK,

My 2 bobs worth

Speed needs to be less than 1.5m/sec. I have never heard of a belt at 4.5m/sec for finished cement!!!

Loading Angle should be level.

Install a de-aeration screw just before the feed chute/spoon. These forces the cement over a "weir"

Use a forward inclined feeding spoon.

Let the belt/pipe sag as much as possible just after the loading zone to rock the cement and make it settle ie remove support idlers or increase spacing. Do this in the horizontal section.

Cheers

James ■

Hi.

Have U found a fix for your problem and what did U do to get there.

Thanks

James ■