Watts The Problem?

Erstellt am 22. Feb. 2010 - 11:26

6% of 2000tph is 120 tonnes of water. Depending on the size spectrum you can screen or filter without too much energy consumption. Suppose you can reasonably mechanically dewater to 8% then your final removal of the remaining 40 tonnes, 2%,will demand more power than a large plant could produce anyway. Aim for 8% moisture which any good dewatering screen will provide. Screen manufacturers will advise you on further draining expectations during storage.

Re: Power Station Coal Drying

Erstellt am 22. Feb. 2010 - 02:17

Hi louispanjang

How does "screen" and "filter" and mechanical de-water" work? Can you refer me to some sites or something? Manufacturers?



Re: Power Station Coal Drying

Erstellt am 26. Feb. 2010 - 04:21

If this application is at a thermal power station, don't you have lots of waste heat available from the process?

Have a look at fluidized bed dryers and investigate using waste heat form the plant.


Erstellt am 26. Feb. 2010 - 05:36
Quote Originally Posted by PietPowerStationView Post
Hi Gentlemen

Are there any technologies available on the market that will enable you to dry 2000 ton per hour of 12% moisture content coal down to 6% MC? I cant think of a way of doing this that wont take an incredible amount of energy?



Why even bother if you are using stokers?, most folks simply have a coal shed for high grade met. coal to store it in a covered area prior to burning or dont even bother covering it.

A rotary kiln with exhaust stack gas would be one way but its an opportunity cost decision and the problem is simply handling and rehandling and rehandling.

Heating it to dry will only enable spontaneous combustion to occur with aid of the heat source if the coal is easily shattered.

Physics Of Drying Coal

Erstellt am 4. Mar. 2010 - 11:30

To remove surface moisture one needs to apply enough energy to break the surface tension. Many mechanical devices can do this well.

To remove interstitial moisture one needs enough energy to drive moisture out of voids. This requires a force beyond the capacity of mechanics. This is where we enter the application of Thermal.

An alternative technology is now available which has been operating in the food and textile industries for years. It Microwave drying. This technology basically does the same thing as a thermal dryer but focuses the energy on the water molecules rather than heating up the whole mass.

See attached technical paper, and go to

drycol paper sacps 170807

href="http://www.drycol.com" target="blank">www.drycol.com for more information.


Trevor Learey

drycol paper sacps 170807



drycol paper sacps 170807 (PDF)