In aspect of the heating boiler construction there is two main pellet group:

Wood pellet made from woody materials,(mainly sawdust)
Agripellet made from agricultural biomass.

The most important different between the two pellet types is the ash content. The wood pellet have 05-1% ash and the agripellet have 3-10% ash. For the wood pellet designed boilers not recommend to use agripellet due to high ash contetnt. The agripellet cheaper than woodpellet. To burn agripellet need specialy designed boiler as CARBOROBOT.

Wood pellets are a highly compressed standardised product made from sawdust, normally without other additives.
Their advantages are:
• they are a consistent fuel with low moisture content which can be easily handled in automated systems;
• bulk density is around 4 times that of wood chip, requiring less storage room making them more convenient at a domestic scale. In other countries bags of pellets are commonly sold on filling station forecourts.
Their disadvantages are:
• supplies of locally made wood pellets are hard to find in the EU, most are imported at present;
• they take energy to make and are often transported long distances, reducing the environmental benefits of using a wood fuel;
• they are expensive, around twice the price of wood chip.

For the CARBOROBOT boilers the wood pellet is essential biofuel.

Agricultural biomass includes animal manure, cellulosic crop residues, fruit and vegetable culls and food-processing effluent. Potential energy crops include high-yielding, high-carbohydrate crops such as switchgrass and vegetable-oil crops such as canola and sunflower, and hydrocarbon plants such as milkweed and gumweed.

With the tumultuous world energy situation a possible great variation in energy prices appears in the near future. Since energy usage is often very short term, longer term stability for agricultural biomass is needed. In many areas, agricultural biomass can economically heat factories, schools, homes, churches, grain bins, and farms. Excess agricultural biomass can produce electricity, heat, or steam for many rural or urban uses.

For the CARBOROBOT boilers the agripellet is the most perspective biofuel. The boiler can operate with a wide range agricultural biomaterial.

More information Agripellet