Hi there

We have same situation with moisture content (more 32%-ar) of coal in stock yard specially on rainy season. From the ships (unloading) moisture content is range from 25-32% and need max 25% when enter coal bunker at boiler system. We used 35000-40000 ton/day and total stock is keep about 800000 ton.

We think to make such a roof or warehouse or silos at the stockyard. Is it effective / economic for reducing moisture content?

Thanks

huri amri ■

If you use a LamiFlo System to pump the coal from your tansportation vehicle to the warehouse, then this system has a wonderful spin off for drying the coal, as it is pumped.

It uses air rather than heat sources, and therefore is a fanstatically cost effective drying solution, as well as being able to pump materials over 500metres

www.lfpumping.com ■

The situation you describe is the result of a serious design oversight. Its frequency is an indicator of the power station contractors' ignorance of your tropical operating conditions.

Rainwater ingress occurs during the stevedoring operations at both ends of the shipment through the open hatches. There is some smaller addition during onshore handling. Some power plant operators stack winrow for blending which, although admirable in dryer climes, presents tropical downfalls with ideal catchment and retention furrows.

Covering the pile is a case of 'closing the stable door after the horse has bolted'. You would have to consider the suitability of the stockyard equipment for one thing. In many cases sheds would be prohibitively expensive unless the machinery was replaced. You would still have the delivered moisture to contend with.

There is plenty of waste heat available. Introducing waste heat to the wet coal is the problem. It must be introduced just upstream of the bunkers & comes in liquid & gaseous carriers. The nearest convenient sources will be untreated flue gas & open circuit cooling water. Flue gas will be hotter & combustion conditions must be balanced against the relative inertness. Cooling water would entail a large heat exchanger because you cannot risk damage to the water pipes!

I'd go for a large, the largest, rotary kiln dryer fed by raw flue gas, drawn from the main flue by a big ID fan. Have the original designers left you enough room for a proper job?■

We are currently doing some work with a Korean Power Station.

Looking at Microwave Drying of their higher moisture (Lower cost) coal in an effort in getting their BTU target for their feed blend more optimal.

Go to www.drycol.com ■

The drycol website is so slow I thought I'd better ask...just in case.

Just what sort of power consumption are we talking about with these microwave machines?

How is the separated moisture removed?

Is there any possibility for heat recovery/regeneration?

Have the Korean owners checked the advantages of chucking power, which they have only just developed, back at the fuel source?■

Dear, If, I am not wrong,you are discussing about Drying Indonesian coal,you will have to adapt natural drying method together with rotary coal dryers.The cost depends upon how much coal TPH you want to dry.

Regard, Anil

www.libranengineering.com

09811055650 ■

Fluid bed drying is often more efficient, cost-effective, and in a smaller footprint than rotary drying. We would be happy to discuss further how Ventilex can dry your coal product before transport into silos/bunkers/boilers/etc.

Energy usage is difficult to predict right now, and depends on how much heat we can reclaim from flue gases, hot water, and other sources, but our dryers are well suited for direct use of these heat sources.

Please get in touch and we can discuss your application in more detail. ■

consider www.drycol.com ■