Originally Posted by kalin89

Dear Friends,

I'm writing this message because I need help with the design of a pneumatic conveying system which purpose is to convey the ash generated in a power plant.

My requirements are as follows:

Horizontal length: 10.000 m

Vertical length: 250 m (upwards)

Conveying capacity: 25 TPH.

Density of ash : 0.85

I need your opinion about this project, because it's a very long pipeline. In particular, I'd like to know your opinion about energy consumption *(I want to estimate the total cost) and information about the pump systems that I need.

Thank you very much in advance for your help.

Rodrigo.

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Rodrigo,

For this project, you have to use a dense phase conveying system with a drop-out station located about every 100 to 200 meters. It means you will need about 50 to 100 conveying systems. Power required for each system may be about 100 to 200 hp. This gives you a rough idea.

Regards,

Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Email: Polypcc@aol.com ■

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25 tph at 10 km is not a viable system. 1 truck load an hour will do the job with very low operating costs.

If you are transporting to an existing lagoon or landfill and dont need it very dry then just use an ash

conditioner and wet it slightly about 5% and transport in open lorry.

Since fly ash is easy to convey 1 -2 km in a single system in Dense phase conveying system is almost standard

in power plants. But they are not cheap to run !I am not sure why Mr Agarwal can only go 100-200m with flyash

on a single system with very high installed power. ■

Originally Posted by Mantoo

25 tph at 10 km is not a viable system. 1 truck load an hour will do the job with very low operating costs.

If you are transporting to an existing lagoon or landfill and dont need it very dry then just use an ash

conditioner and wet it slightly about 5% and transport in open lorry.

Since fly ash is easy to convey 1 -2 km in a single system in Dense phase conveying system is almost standard

in power plants. But they are not cheap to run !I am not sure why Mr Agarwal can only go 100-200m with flyash

on a single system with very high installed power.

Mr. Agarwal thanks for your quick reply, buy I've got some question about this thread. En this topic, Mr Tuinenburg says 502 kW is enough for 6 km (ie. ~84kW per km), but I've calculated with your suggestions and I've gotten 3880 - 7360 kW per km. I think the difference is too big. Could you explain me what is the difference? ■

Dear Rodrigo,

Horizontal length: 10.000 m

Vertical length: 250 m (upwards)

15 bends

Conveying capacity: 25 TPH.

Density of ash : 0.85

Ash size 150 micron

Screw feeder for avoiding purge times and possible choking.

Preliminary calculation results:

Pipe diameter: 593 mm (24”)

Compressor: 3* Aerzen VML95 – 7200 rpm (3* 1.766 =5.3 m3/sec)

37 tons/hr at compressor pressure of 1.50 barg

Power consumption:

compressors: 3* 297 = 892 kW

screw feeder: 22 kW

Energy consumption: approx. 23.6 kWh/ton.

The SLR is 1.76

The design can be improved a little by fine tuning, but not much.

The majority of energy is spend on gas resistance and suspension.

As Mantoo already stated: A (pneumatic) bulk truck will do the job.

Have a nice day. ■