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Giant king grass to pellet fuel holds giant profit potential

By Jack Huang    Mar 27, 2015

 

giant king grass as biomass pellet fuel raw materil

Giant king grass is also known as Elephant grass, Napier grass, or Uganda grass, which is the most popular planted biomass fuel in the tropical and subtropical regions where the sunshine can last more than 100 days per year and the rain volume can be more than 32 inches per year. The favorable growing conditions makes the growing of giant king grass very fast, which can be harvested in 195 days after planting for pellets production at 13 feet tall, and be harvested again every 120 days, and about 375 metric tons of fresh giant king grass biomass with the moisture content around 70% can be harvested per hectare within a year.

Giant king grass as resource fuel source

Giant king grass as energy plant can provide about 4400 kcal per kilogram or 18.4 MJ per kilogram. The energy analysis of giant king grass is showed in the following table:
 

Proximate Analysis Unit Sun Dried As Received Giant King Grass Bone Dry
Total Moisture % 14 0
Volatile Matter % 65.68 76.37
Ash % 3.59 4.17
Fixed Carbon % 16.74 19.46
Total Sulfur % 0.11 0.13
HHV MF/kg 15.85 18.43
LHV MF/kg 14.52 -

After analyzing the elemental and ash content of giant king grass, it is found that the component of giant king grass is similar with that of corn stover in properties, which is the excellent biomass materials for pellet production. Giant king grass as a high yield plant can be a good resource of biomass raw materials for pellet fuel production.

Comparison of giant king grass, corn stover and miscanthus

In order to give you a vivid understanding, the comparison between corn stover and miscanthus and its pellets are given in the following paragraph for giant king grass, corn stover and miscanthus are similar in composition in terms of lignin, ash, glucan, xylan, etc.

Composition Dry Weight% Giant King Grass Corn Stover Miscanthus
Glucan 43.0 37.4 44
Xylan 22.3 21.1 22
Arabinan 2.9 2.9 2
Lignin 17.4 18.0 17
Ash 4.5 5.2 2.5-4

From the above table, it is obvious that the lignin content of giant king grass is around 17.4 %, corn stover around 18% and miscanthus 17%, and the ash content of the three is 4.5%, 5.2%, and 2.5- 4 %. All in all, giant king grass, corn stover and miscanthus have the similar composition and therefore, giant king grass can be produced into pellets just as the corn stover and miscanthus do.

Advantages of giant king grass as raw materials for pellet production

Giant king grass as biomass raw materials has the following advantages:

  • High yield, but low cost
  • Neither special care nor pesticide is needed.
  • Little fertilizer is used.
  • Easy grow and easy to process into bio-fuel, such as pellets.

Production of giant king grass pellets fuel

How to produce giant king grass pellet? Generally speaking, freshly harvested giant king grass can be produced into pellets by going through the following procedures.

ring die pellet mill
  • Drying: the moisture content of freshly harvest giant king grass is high as 70%-75% which needs to lowed to around 10% to get ready for the pelletizing and ensure a better quality.
  • Crushing: As its name suggested, the giant king grass can be 4 meters tall, and it is required to crushed into small piece with the size no longer than the diameter of the die holes of pellet mills.
  • Pelleting : As the core procedure of pellet production, pelletizing directly influence the quality of pellets. Given the same raw material conditions, better quality pellets can be produced by high quality pellet mills.
  • Cooling: Newly extruded pellets are hot and soft which need to be cooled down to get enough hardness and durability.
  • Packing: After cooling the pellets can be packed according your requirement.

Giant king grass pellets benefits

The giant king grass pellets can benefits you in the following way:

  • Raw materials are totally renewable.
  • Rich resource means low pellet production cost.
  • High energy content and better burning performance.
  • High density makes the transportation and storage more convenient.
giant king grass pellets

Comparison of pellets fuel of giant king grass, wood pellets and straw pellets

When it comes to heat value, giant king grass can provide 7900 BTU per dry pond, corn stover around 7560, and coal about 9000. Giant king grass pellets as a biomass fuel is not inferior to wood pellets, better than straw pellets and can be a substitution of coal and the detailed information are shown in the following table:

  Density kg/m3 Moistue % wet basis LHV( NCV)MJ/kg Ash % dry matter
Goal 850 10-15 24 12
Wood pellets 650 <10 17.3 0.5
Straw pellets 600 <10 15 5.2
Giant King Grass pellets 600 8.8 15.6 5.1

Giant king grass pellet plant project

giant king grass pellet plant flow chart

Project profile:

  • Project time: 2011
  • Location: Guangdong province, China
  • Raw materials: giant king grass
  • Total investment:13 million RMB.
  • Project line: pressing, chopping, grinding, drying, and pelletizing.
  • Production capacity: 10,000 tons / year
  • Production cost: 250RMB /ton in total
  • Sales price: 850 RMB / ton
  • Target markets: Pearl river delta region
  • Pellets quality : giant king grass pellets with moisture content around 8.8%, grow calorific value 4.72 k Wh/kg.

Due to confidential reasons, the detailed information is not provided and the general information is provided for your reference. According to the above information, it shows that to make giant king grass into fuel pellets holds great profit potential. It will be a good choice to invest in giant king grass pellets production. More information about the giant king grass pellet plant, please consult the specialist or leave your question below.