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Rice Husk Converted by Pellet Mills into Pellet Fuel Treasure

By Jack Huang    Nov 06, 2014

Paddy rice production

Rice huske and rice husk pellets made by pellet mills
Rice husk and rice husk pellets

Paddy rice as one staple food for over 50% percentage of the world population is cultivated by over 20% of world population and covered 1 percent of the earth’s surface. The global paddy rice production had been increasing continuously on an average rate of 16.48 million tons in the last 10 years, with the production of 2011 around 718.3 million tons, valuing around 240 billion US dollar. The main paddy rice production counties are China, Egypt and Cuba, which contributes to 27.51%, 0.63% and 0.77% of the global paddy rice production. Paddy rice averagely is consisted of 72 % of rice, 5-8 % of bran, and 20-22 percent of husk. Rice husks is one of the main by- products of paddy rice production, which is a potential material , and is the topic of today.

World rice production and trend
World paddy rice production and trend(2011)

Paddy rice husk properties

Paddy rice husk consists of inner and outer glume, with the length of 2.5- 5mm, or 5- 10 mm, with the thickness of 25 -30 um, with the color of golden yellow, tawny or brownish red hue. Rice husks has rich crude fiber content, lingnocellulos and cellulose 40%, and five-carbon sugar polymers, also named as hemicelluloses 5%. The bulk density of rice husk is 96-160kg/m³, which will be higher after crushing.

Typical rice husk properties analysis
Typical rice husk properties analysis

Paddy rice husk takes up 20% of the paddy rice weight. Therefore there are more than 100 million tons of rice husks is produced globally, around 70% of which is not utilized properly because of the difficulties in paddy rice husk biodegradability and the disposal of combustion ash of rice husks. According to estimation, the global demand for paddy rice will be up to 780 million tons by 2020 and tons and tons of rice husk will be produced and waiting for better solution.

Rice husks is always used as a burning materials for its caloric value is about 14 MJ/kg, which equaling 35% of the caloric value of diesel or bunker oil with a caloric value of 40.5 MJ/kg. Comparing with wood, rice husk is also proved to be an effective materials. The component comparison of the rick husk and woods are shown in the following forms for your reference.

Comparison of rice husk, rice straw and wood
Comparison of rice husk, rice straw and wood

Rice husk pellets for fuel

Rice husks is just like woods, which is a good materials for fuel pellets production after comparing their components in the above forms. Now we need to know how to make rice husk pellets.

Rice husk pellet production video

Usually, the rice husk pellet production line mainly consists of the following procedures:

Usually, in an entire rice husk pellet production line the following equipment are involved:

  • Sievers or screeners will get rid of the dust or other impurities in the rice husk to protect the processing machine in the pellet production line and also to ensure the pellet quality eventually.
  • Grinder or hammer mills will reduce the size of rice husk and make it into fine power which will be ready for pellet production.
  • Rice husk pellet mill will compress the rice husk power into fuel pellets.
  • Packing machine will package the rice husk pellets into bags with different specifications based on requirements.
  • The final rice husk pellets will be stored properly.
  • Notice: In the processing of rice husk pellet, binders are recommended, such as, saw dusts. During pelletizing, the lignin in saw dusts will be melted under the high temperature in the pellet mill and the melted lignin will work as a binder to help the formation of rice husk pellet.

Rice husk pellet mill info

Pictures of rice husk pellet mills Features of related pellet mills
ring die rice husk pellet mill Ring die rice husk pellet mill

For large scale rice husk pellet plant with capacity more than 1 ton/h;

By combining several pelletizers, your pellet plant can reach 20 t/h capacity
flat die rice husk pellet mill Flat die rice husk pellet mill

Electric engine, diesel engine, gasoline engine and PTO are optional.

Capacity from 50kg/h to 450kg/h flexible.


Advantages of rice husk pellets

Rice husk pellets
Rice husk pellets

Now rice husks are collected and transported from various rice mills to rice husking process plant for rice husk pellets production for the following advantages of rice husk pellets :

1) Good to environment.

Rice husk pellets as a biomass fuel will ease the environment pressures caused by fossil fuel combustion. Comparing with the burning of rice husk, the burning of rice husk pellets is much more clean. The ash content is around 15 to 16 % when burning directly which will be largely decreased to 6 to 7 % when it is burned in pellet form.

2) Convenient

Rice husk pellets are highly densified and compacted into small size, which make their storage and transportation much easier and convenient. On the other hand, the small, regular and uniform shaped rice husk pellets make the feeding of automated heating system more easily.

3) High effectiveness

Comparing with burning directly, rice husk pellets can burn longer and the combustion rate of rice husk pellets can be above 95%. The characteristics comparison of rice husk and rice husk pellets are shown is the below form, for your reference:

Comparing with wood, rice husk pellets is also proved effective. Rice husk pellets has a low moisture content of 7 to 8%, which doesn’t need to consume energy to burn it off, making the burning of rice husk pellets effective.

4) Wide application.

Rice husk pellets can be applied in many appliance. It can be burned in heating furnaces, boilers, pellets stoves and traditional stoves, and other heating systems.

After analysis the advantages of rice husk pellets, don’t you think it is a good chance to make rice husk pellets fuel if you have tons and tons of rice husk available? If you have any questions on rice husk pellet production, please feel free to leave a message in the form below. Any question is welcomed and free consultation is provides.