Home » Products » Briquetting press

The process of "BRIQUETTING" is the physical transformation of the loose raw material into a compact form. The form change results in a much higher specific density of the material, which increases its combustion efficiency as compared to the loose material.

The following agricultural and forest wastes and residues can easily be converted into fuel briquettes ie. "BIOCOAL"

1.Raw materials for briquetts.

Forest Wastes and Residues Agricultural Wastes and Residues
a. Saw Dust, Sandar Dust a. Husks - Rice, Coffee, Sunflower
b. Wood Chips and Shavings b. Shells - Groundnut, Almond, others
c. Tree Bark and Twigs c. Cotton Stalks,Arhar Stalks
d. Pine Needles d. Bagasse, Sugarcane Leaves and Trash
e. Wild Grasses and Shrubs e. Maize Stalks and Cobs
f. Bamboo Leaves etc. f. Mustard Stalks
  g. Bajra Cobs
  h. Coir Dust, etc.

  • Calorific value of these agrowastes range from 3500 kcal/kg to 4500 kcal/kg.
  • These and other materials can be briquetted individually or in combination


  • Biomass briquettes have calorific values ranging from 3400 to 4200 kcal/kg .
  • The ash content is only 2 to 20%.
  • It is equivalent to `B' Grade coal in terms of calorific value.
  • They do not emit any harmful substances like SO2 or nitrogen oxide during combustion.
  • The bulk density is in the range of 800 - 900 kg/m3


The main advantages of briquetting are :

  • The bulk density of biomass is increased multifold, thus saving in storage, transportation & handling costs.
  • Uniform physical dimensions & combustion characteristics, results in more efficient energy conversion.
  • Facility for efficient utilization of a renewable source & as an alternative to fossil fuels like coal, lignite, etc..
  • Dust pollution associated with direct combustion of loose biomass can be avoided.
  • Biomass briquettes can be used in almost any type of existing combustion grates.


The main advantages of briquetting are :

  • Waste materials are tested for their chemical composition to decide on their suitability and to select a proper mix.
  • Sun dried material containing approximately. 10 - 15 % moisture is suitable for briquetting. However if material has higher moisture content it needs to be dried before use.
  • Material is screened, chopped and ground to get the desired size and bulk density and is pneumatically transported into storage bins. This helps in separation of the heavier and metallic particles and also unifying moisture content in the material. Air used is hot or wet as the case may be, for control of moisture. ln this process the cellulose bonding in biomass collapses due to application of high pressure (1200 kg/sq.cm), and temperature (200 o C) & more thereby fluidizing the lignin.
  • The moisture content in the material should be lesser than 12% for best results during compaction. Material from bin is discharged to the machine through regulated conveyors where it is compressed in specially designed dies. The compression raises the temperature of the material, softening some of the inherent binders in it, which come to the surface and bind the material together.
  • Briquettes formed are in the shape of logs or pellets, which are forced through tracks for proper shaping, by cooling them under pressure.
  • Cooled briquettes are cut and packed in bags or stored in bulk for shipment or use.
  • No Binder is required in the process.


Briquetted fuel can be used by the industrial, commercial and household sectors. It is ideally suited for use in the following areas:

a. Boilers (sugar mills, paper mills, chemical plants, dyeing houses, food processing units, oil extraction units, vanaspati units etc.) using fuel for steam generation and heating.
b. Forges and Foundries For metal heating and melting.
c. Brick kilns and Ceramic Units For firing of furnaces.
d. Residential Heating For winter heating in cold areas and in restaurants, canteens etc.
e. Gasification The gas can be used to generate power,and eventually replace coal based producer gas systems and oil firing in furnaces.


Fuel briquette is black / brown in colour.. When agro-waste of cellular nature is briquetted, it produces low cost, high calorific value fuel which can from a good substitute for wood and coal. This implies conversion of waste into a useful energy source. The end product has the following typical proximate analysis :-

i. Ash 2 to 10 %
ii. Moisture 7 %
iii. Volatile 30 - 60 %
iv. Fixed carbon 30 - 60 %
v. Gross calorific Value 3500 to 4500 kcal/kg.
vi. Size of briquettes Diameter 60 - 62 mm
vii. Length of Briquettes Length 50 to 200 mm


The land requirement for the smooth running of the plant with a raw material inventory of 30 days is 2000 sq.m. The Built-in-Area for operating two machines with briquette storage is 120 sqm.(25 ft x 50 ft).



Power is one of the critical areas which determines the succesful operation of a briquetting unit. The availability of continous power at the required voltage of 415 V is essential for the economic viability of the project. The total Power required for a typical 1500 kg/h Briquetting Project is 100 hp.


The Project does not required large quantities of water. A small quantity, to the tune of 10 lit/min would be required for cooling water purposes, which would be recycled. The only other water requirement would be for potable water and general maintenance and cleaned purposes, which would not exceed 250 litres per day.