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Wood Pellet Mill
- May 28, 2018 -

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Pellet Processing

To make pellet as solid fuel, coco peat should have important characteristics namely high density pellets, low moisture content, uniform size, high energy content, easy to store and transport to long  distance. Coco peat as feed stock can be processed into pellet shape and when they are burned using gasifiers, it will produce synthetic gas that can be used as energy or heat source for cooking in households and drying for agricultural products.

Pelleting of coco peat is a densification process which improves its characteristics as a fuel, enhances its volumetric calorific value, reduce transport and storage costs, make less moisture content, and improves its handling characteristics, such as higher density, friability and combustion efficiency (controllable feeding, more uniform and homogeneity fuel). Biomass pelletizing is a process of reducing the bulk volume of the material by mechanical means for easy handling, transportation and storage.  

Adding Adhesive

Biomass of plants in general have a high lignin content so because of the high lignin content will be helpful as the adhesive substance when  used as pellet. Since lignin content of coco peat is relatively low, there should be added an adhesive such as starch when processed into coco peat pellets. 

Pelletizing

Coco peat is first screened and formulated with other materials such as starch and waste cooking oil. These materials are mixed and pelletized using pelletizer to form coco peat pellet. Mostly biomass from plants is lignocellulosic biomass in its original form usually save a low bulk density of 30kg/m3 and a moisture content ranging from 10% to 70%

Coco Peat Pellets Specifications&Packing

Specification

Pellet Size- Æ 42mm x 6mm ±2mmPellet weight - 6 g 

Pellet Volume compression ratio- 5:1

Packing

Packing of 25 pellets in one Pack

Packing of 1000 pellets in one carton box

Also as required by customers 

Usage

Pellets can be used for : 

1. Used as feed pellets for animal 

2. Used as organic fertilizer pellets 

3. Used as fuel pellets 

Combustion

It  was burned on an updraft gasifier to produce syngas and then flowed using pipe through the stove. Syngas come from stove was split, burnt and the heat generated was used for boiling water and for drying. Gasification can be explained as a staged combustion process and this can be done by burning coco peat pellet at a limited supply of oxygen. The gas which is produced from combustion still has potential to be burned. The objective of gasification is to break complex molecule bonds into simple gases i.e. hydrogen gas (H2) and carbon monoxide (CO). H2 gas as a main component of a syngas has very clean burning characteristics.

Air quality around the stove (emission test) are measured and analyzed  when gasification took place. The best results of coco peat pellet was  made from 85 % of coco peat waste, 5 % starch (binder), and 10 % of waste cooking oil. Air quality surrounding the stove was tested during  gasification process and it was done based on the Indonesian Environmental Regulation issued by Indonesian Ministry of Environmental regarding standard air quality from static matter) and cover NH3, Cl2, HCl, HF, NO2, particle, SO2 and H2S parameters. The measurements result indicated that all parameters meet the quality standards) include for CO and CO2 parameter  which shows results 0,0001 mg/kg. 

Ⅳ. Advantages of pellets

1. High burning rate. 

2. Easy to be transported.

3. Regular geometry and small size allow automatic feeding with very fine calibration. They can be fed to a burner by auger feeding or by pneumatic conveying. 

4. Their high density also permits compact storage and rational transport over long distance. They can be conveniently blown  from a tanker to a storage bunker or silo on a customer's premises.