6,000,000 KCal/Hr HGG

Yes this one is huge, capable of combusting 2 ton per hour of rice husk. This unit were use to supply hot gas to a ball mill in a cement plant in the Philippines.

                                 6,000,000 KCal/Hr HGG

It is equip with sensors and inverters for control from a DCS which is 50 meter away. Only one person are posted on site and monitoring and control are carried out from the control room.

Key Features of the HGG
- 18 inch furnace wall with extra outer insulation for very low heat loss
- Automatic Deashing
- Automatic Feeding
- Inverter for FD and ID Fan
- PLC built in
- Ash Auto Mix to Ball Mill
- Over Temperature Release Vent
- and many more


                             PLC control in DCS

Maximum Savings of RM4,000 per hour is possible when compared to the use of fuel oil for combustion.

Hot Gas Generator

One of the plant we sold have a more advance furnace which reduce manpower and also ease of operation .

As pelleting need very accurate moisture content , the Hot Gas Generator help tremendously especially for big scale operation and also for less experience operator .

The Moisture Content of dust was constantly within ± 1% MC after exiting the dryer . This eliminates one of the most important varible in pelleting , in my previous post I mentioned that MC consistency are very important for good pelleting .

To explain a bit why the Hot Gas Generator helps a lot and normal furnace have it's pertinent issues . Normal furnace feeding of fuel is by hand , worker tend to overfeed the furnace which have small grate , by doing so the worker will have longer time to sit , by doing so too the temperature of the furnace will fluctuate through very wide range which cause drying inconsistency . Hot Gas Generator feed fuel automatically at set parameter and flame in furnace can be control by fan , this will give consistent flame in furnace continuously thus consistent Moisture Content of the sawdust output from dryer .

Drum Dryer

Sawdust Drying

We are touching this topic specifically due to it's importance to make good wood pellet unless your sawdust is already dried to 15% Moisture Content ( MC ) .

If you have gone through our earlier writings , the cost of drum dryer are significant for a Whole Line Wood Pellet Plant . The High price are due to it's big structure and complication in maintaining stable MC sawdust output . Sawdust comes in various MC from 12% to 60% , therefore it is important to control the MC for optimum pelleting otherwise you would not get high standard wood pellet and high production efficiency .

We will now study a typical drying process base on the following conditions :

1 ) Input Sawdust MC 35%

2 ) Output Sawdust MC 12%

3 ) Drying Rate 2 Ton Per Hour Output

To reduce MC from 35% to 12% you would need to evaporate 20% of water , based on 2,000 kg per hour output , water that need to be removed is 600kg and the input sawdust is 2,600 kg/hr .

To remove 600kg of water you will need 640kw ( 550,000 kCal/hour ) of energy which is equivalent to burning 200kg/hour of wood offcut . In short 100kg/hour need to be combusted to dry 1 TPH ( output ) sawdust . Cost of drying would be about RM5 / ton sawdust if your offcut cost is RM50 / ton .

The Calculation Chart below is from ASPENTECH software and reconfirm by manual calculation which I did not show here due to it's tediousness of calculation , suffice to say the input data , output data and design of the dryer are correct .

Drum Dryer selection are important , many factor affect the cost of the dryer , in this case we believe Drum Dryer Size of Diameter 1.5 meter X Length 9 meter should be enough to dry 2 TPH of sawdust .

Cost of this dryer should be around RM200,000 landed in Malaysia c/w stove , electrical panel and cyclone .

We hope to use this Dryer and the Pellet Mill to make EFB Pellet once we have started Wood Pellet Production probably in August 2011 .