Complete EFB Pellet Plant

EFB (Palm Empty Fruit Bunch) is a kind of waste material after harvesting palm fruit. Which have high calorific value, the traditional way to treat EFB is to burn them and use the ash as fertilizer, but the burning process brings a lot of pollution to the environment. These years we have a lot of studies on EFB, and finally, we found due to the high calorific value of EFB, it can be good biomass material to make pellets. If we can turn the EFB into biomass pellets, to burn the pellets there will be higher calorific value and less pollution, since biomass pellets are a kind of clean energy and widely use in developed countries as fuel for home heating, furnace, boiler, and powerplant.

Based on this purpose and under our engineering team's long time researching and developing, we designed an EFB pellet plant to turn EFB into biomass fuel pellets.

Now we have a 1.5t/h EFB pellet plant for beginners, 3t/h EFB pellet plant and 5t/h EFB pellet plant for industrial EFB pellet production purposes, 6t/h EFB pellet plant, 8t/h EFB pellet plant and 9-10t/h EFB pellet plant for commercial purpose. We also have the ability to design larger EFB pellet plants according to client requirements.

Complete EFB pellet plant includes: Shredding Part, Drying Part, Grinding Part, Pelletizing Part, Pellet Cooling & Sieving Part, and Pellet Packaging Part.

The shredding part first steps to process the size of EFB, generally an EFB size is around 200-300mm, first step we need to turn EFB into the fiber. We use an EFB shredder to process EFB into fiber size, the fiber is around 1-2mm diameter and length about 10-50mm length.

The EFB shredder combines the inlet conveyor, shredder, out conveyor. EFB feed to the inlet conveyor, which move EFB to shredder feeding inlet, the rollers at feeding inlet will send EFB inside the shredder. Inner shredder there are rotary blades and a stable blade, when the rotary blade rotating to the stable blade, the blades cut EFB into fiber and the fiber finally moves away by the outlet conveyor.

The feeding inlet is controlled by a hydraulic system, if a very big size EFB touches the rollers the hydraulic pump will rise up the upper rollers to make the feeding inlet bigger thus it can go inside the shredder.

The blades of the shredder are made of high wearing resistance alloy steel thus having a better shredding effect and long lifetime.

The drying part is designed to reduce the moisture of EFB fiber, commonly the moisture content of EFB is around 50%, while the best moisture to make pellets is around 15%, so we put a rotary kiln dryer in the EFB pellet plant to reduce the moisture of the EFB fiber.

A rotary kiln dryer includes an inlet conveyor, heating oven, dryer tube, outlet conveyor, and dust collection system. EFB fiber go-to dryer tube from inlet conveyor, the hot air go to dryer tube from heating oven, EFB fiber and hot air mixture inside dryer tube and the moisture got evaporated, and dried EFB fiber go-to outlet conveyor from the end of dryer tube, the dust goes to the dust collection system.

To assure the drying effect, the rotating speed of the dryer tube is VFD adjustable, in case the inlet EFB fiber has a big difference in moisture contents. If inlet moisture is high adjust the rotating speed slower, reverse if inlet moisture is low adjust the rotating speed faster, thus making sure the final dried EFB fiber moisture content is uniform.

Due to EFB fiber is long and soft, we use a single-pass dryer tube in the EFB pellet plant. The inner space of a single-pass rotary kiln dryer is bigger compared with three pass rotary dryer. So the EFB fiber can not block inside the dryer tube.

The dust collection system at end of the dryer is made up of a blower, cyclone, airlock, and chimney, this system can collect the dust during the drying process thus to make reduce dust at working place.

The grinding part is designed to reduce the size of EFB fiber. Generally, the pellets produced with 6mm, 8mm, 10mm, or 12mm diameter, among them 6mm and 8mm diameter are most popular. So before feed the dried EFB fiber to the pellet mill, we need to process the length of EFB fiber smaller than the diameter of pellets want to produce. Because if the EFB length is too much bigger than the pellet diameter it is not easy to press them into the hole of the ring die, thus influence pelletizing efficiency.

The grinding device we designed in an EFB pellet plant is a hammer mill. A unit hammer mill consists of an inlet conveyor, hammer mill, discharge auger, dust collection system, and outlet conveyor.

Dried EFB fiber goes to hammer mill from inlet conveyor, inside hammer mill the hammers bite EFB fiber to crush them, until the size got smaller than the holes on screen it can be discharged from discharge auger. The dust collection system includes a blower, cyclone, airlock, and dust bags. Crushed EFB and dust will go to the outlet conveyor and be moved to the next step.

The hammer mill we applied is a water drop type hammer mill, which can be opened from two sides, thus make it easier to change hammers, screen, and maintenance.

With the above preparation of moisture and the size of EFB, the next step will be pelletizing. We use a vertical type ring die pellet mill to pres EFB fiber into biomass fuel pellets.

Our vertical type ring dies pellet mill MKLH600 model is designed to produce EFB pellets with a lot of advantages, the capacity of one set is 1.5t/h for output pellets. If you want higher capacity can put more pellet mills in one EFB pellet plant.

Our vertical type pellet mill have advantages in feeding EFB fiber because the fiber is soft if feeding vertically by gravity the EFB fiber can fall into the pelletizing chamber,

For vertical type ring die pellet mill when machine running, the rollers rotating in the middle of ring die while ring dies stable, the rotating rollers can bring centrifugal force, which will help rollers to press EFB fiber inside the hole of ring die, thus to improve pelletizing efficiency.

Our vertical type ring dies pellet mill is equipped with an automatic grease pump that can inject grease to bearings for rollers and the main shaft.

The gearbox of our vertical ring die pellet mill is specially designed, the gears are more heavy and strong to meet the strength needed for pelletizing.

Data for vertical type ring die pellet mill

Pellet Cooling & Sieving Part is designed to cool down the pellets and move the dust, powder and small granular form pellets, thus making sure the pellets go to the packaging machine or storage tank is high quality.

Thus unit includes a counterflow pellet cooler, dust collect system and pellet sieving machine.

The counter flow pellet cooler is controlled by an electric panel with a sensor and time relay, cool air goes to the cooling tank to the mixture with hot pellets thus reducing the temperature of pellets. And the automatic system control discharge of pellets from pellet cooler to the pellet sieving machine.

The whole system is a closed structure, on top of the pellet cooler is an airlock, only pellets can come inside the cooling tank while air can not emission from the top. With suction of blower, cool air comes inside cooling tank from the bottom of cooler and hot air emission from the blower. Some dust will go to cyclone together with hot air under suction of blower.

A pellet cooler can reduce the temperature of pellets at same time it can increase hardness of pellets and decrease the moisture of pellets. After reducing temperature and moisture when storage the pellets, there will be no crack on the surface of the pellets.

When pellets come through the pellet sieving machine, the screen will move out the dust, powders, and small size pellets, so that all of the pellets go to the next step is very good quality.

* The last stage is storage pellets, here have different solution.

Some clients storage the pellets directly on the ground after the pellet sieving machine, a conveyor can do the work to send pellets from the sieving machine to the storage place.

Some clients storage pellets in a big tank, we can provide a conveyor to transfer pellets, design and manufacture storage tanks according to client building size.

Some client package pellets into small bags like 10kg/bag, 15kg/bag, 25kg/bag, 50kg/bag and 100kg/bag. We have a packaging machine to weighing pellets, fill pellets into bags and seal the bags. We have heat sealer to sealing plastic bags and sewing machine to seal woven bags.

Some client pack pellets into 500kg/bag or 1000kg/bag jumbo bags, we have jumbo bag packaging machine to weighing pellets fill pellets into bags.

So, we can provide different storage or packaging solution according to client requirements.

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