Pero Petrović, a retired professor at the Faculty of Mechanical Engineering in Banja Luka, published more than 10 years ago the expert work “Drying processes – one of the ways to reduce energy consumption”, which was proven and would make the production of pellets much cheaper.
However, producers did not show interest in Petrović’s solution, even though they would have a big savings in this process.
Heat from the air
“The paper states that with the development of efficient and cheap air-air heat exchangers, it is possible to use them in the drying process to significantly reduce the amount of heat required for these processes. At that time, devices for utilizing heat from waste air in air heating systems were already widely used,” explains Petrović.
Then the application of devices for the production of briquettes and pellets from sawdust began, as well as the production of boilers for their use in heating systems of buildings.
Theoretical assumptions confirmed in the dryer
“This led to an increase in the demand for these fuels, and also to an increase in their price on the market. In order to verify the justification of the allegations in this professional paper, at the Faculty of Mechanical Engineering in Banja Luka, under the mentorship of professor Milovan Kotur, student Ognjen Rajlić completed the final paper “Utilization of waste heat from the drying process in the wood industry”. The theoretical propositions presented in my professional paper were calculated on a dryer with a capacity of 50 cubic meters of oak boards per batch. It has been proven by calculations that by applying the solutions mentioned in the paper on an annual basis, 100 tons of dry sawdust, which is a semi-product for the production of briquettes or pellets, could be saved on a dryer of the specified volume,” explains Petrović.
Device repayment period
According to the current prices of these fuels on the market, the payback period of the device for using heat from the air that is ejected from the dryer during the drying process would be less than one year.
“Using the aforementioned devices from professional and final work on wood dryers, the consumption of biomass for drying processes would be reduced, thus enabling a significant increase in the production of the increasingly sought-after energy sources briquettes and pellets,” Petrović said, adding that he was not sure how much the price would decrease. of these materials could come with this application, but it would be useful for businessmen and the buying public.
Drastic increase in the price of pellets
By the way, the price of pellets per ton has increased drastically and is currently even higher than 600 KM per ton.
At the meeting of the Chamber of Commerce of the Republika Srpska and pellet producers, which was held a few days ago, it was agreed that the price of pellets per ton will be 480 KM plus VAT, that is, about 560 KM. At that time, the producers promised to deliver 10,000 tons of pellets to the domestic market during September and demanded that the Decision on the temporary ban on the export of certain forest wood assortments, firewood and wood products, which is in force until September 21, be revoked as soon as possible, in order to could export pellets and make a profit.
E2 portal (Independent newspaper)
Source: E2 Portal by www.e2.rs.
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