Industrial wood pellets

  

According International Industrial wood pellets specification there are 3 different types of pellets : I1, I2 and I3. Most popular are  Industrial 2 (I 2) pellets. Ash content in these pellets has to be below 1, 5%.

Industrial wood pellets are burned in power plants for electricity production. They can be also used in combined power and heating plants and even on smaller heating plants. In the most of the cases  power and heating  plants where the pellets are used has been  transferred from coal to wood pellets. In these cases pellets usually are not combined with other biomass products. Pellets may be  used  at the whole power plant or on 1-2 boilers of the big power station. In some cases power and heating plants are able to use some other fuels, as for example gas,  but some  power plants totally depend on the wood pellet supply. Power plants working on pellets need them year round. Combined power and heating plants need much more pellets in winter time.

At the moment stimulation of the power generators to use renewable energy  by paying to them subsidies is done in different ways depending on the country. In  UK energy suppliers meet their obligations to produce green energy by presenting Renewable Obligation Certificates ( ROCs),which can be traded.

In Flemish part of  Belgium the State subsidy for burning pellets is paid to the power generators  only for the actual  green energy produced by pellets. Because of that   end users   have to   order the  audits on the pellet plants   for  to deduct  non green   energy  (fossile  fuels) consumption which has been used  for transportation of raw materials to the pellet mill, production of pellets, inland transportation to the harbors  and  for  sea freight. Usually the total energy consumption should not exceed 244-250 KWh e ( electricity)  per   mt of produced pellets. Big problem arises with the   plants which are using gas for their drying system.Their energy consumption    becomes very high and using wood pellets produced by such suppliers   is   questionable.  At the moment authorities of other countries are not looking into the net green energy production, but it is not excluded that this can change.

Very important issues for Wood Pellets are: particle size inside the pellets , dust formation connected to loading and unloading of the pellets and handling them at the power plant, temperature and moisture of the pellets, possible pollutions of the pellets which may happen during their production and transportation, safety issues connected with production and transportation of pellets.