Dear mr Piechbi,

15 tons/hr quick lime over 600 m of pipe line will require approx. 3.0 to 3.2 kWh/ton,

using a kettle system.

The influence of water (humid convey air) can be calculated when the air volume and the

water content of the air is known.

The chemical formula, how the quicklime reacts with the amount of H2O in the convey air, shows how much lime is bonded.

Weighing or metering should be done outside the pneumatic conveying system.

success

teus ■

Quick lime reacts with atmospheric moisture and clogs pipes very fast. Talk to someone who has experience of these kind of systems as the engineering solution is not that simple. ■

Piechbi,

Please see our website. The fluidization hose will handle your material.

http://sciroccohose.com/index.html ■

Dear Philippe,

As far as I am aware, drying of convey air is never done in installations where bulk materials are conveyed.

I can understand that in chemical or pharmaceutical installations drying and conditioning of the air is necessary (or evens the application of an inert gas)

Sometimes the convey air is cooled just after the compressor and the water condenses partly and that water is separated from the air.

Straight forward calculation:

150tons/hr CaO = 4.167 kg CaO/sec

SLR = 17.2

Mass of convey air = 4.167 / 17.2 = 0.242 kg air/sec

At 35 degrC and 90% humidity and at 1 bar(abs),

the water content of the air = 0.03289 kgH2O/kg air

Mol mass of CaO = 56

Mol mass of water = 18

18 kg H2O reacts with 56 kg CaO

Present mass of H2O = 0.242 * 0.03289 = 0.00796 kg H2O/sec

Reacts with 50/18 * 0.00796 = 0.0221 kg CaO/sec

Reacted part of CaO = 0.0221/4.167 * 100 = 0.53 %

I doubt tht 0.53 % bonded mass (evenly spread over the massflow) will cause plugging.

The remaining 99.47 % of dry CaO will clean out the bonded Ca(OH)2

In my experience (mainly cement and 1 case of quicklime) this is the case.

Success

Teus ■

Sorry read ; 15.0 tons/hr

(my keyboard seems to be jammed)

teus ■

Dear Philippe,

The SLR of 17.2 is the result of a preliminary guess calculation.

As the distance of your conveying system is 600m, the SLR should be low.

all for now

teus ■

dear Philippe,

In my (preliminary, guessed, indicative, design)) calculation,

a screw compressor was selected with 13.5 m3/min at 25 bar(o),

requiring 48.8 kw of power.

(A VM 15R Aerzen screwcompressor requires 50.8 kw for 810 m3/hr at 2.5 bar(o))

I assumed a double pressure tank system, where capacity is lost in purging- and pressurizing times.

For more accurate calculations, the product properties of the Lime and the pipe layout need to be known.

best regards

teus ■