Faculty of Forestry and Wood Technology, University of Zagreb
Abstract
This article explores the energy characteristics of wood-chips produced from Salix viminalis - clone ULV, which was cultivated in an energy plantation. The higher heating value of wood and bark of Salix viminalis was assessed through an experimental measurement in a special calorimeter for solid fuels, model IKA C 200. The lower heating value of wood and bark was calculated from the higher heating value Qs, taking into account hydrogen Hdaf and water contentWr in fuel samples that were assessed in a laboratory. The higher heating value and lower heating value of a dry Salix viminalis wood (QSW = 19 520 kJ/kg and QnW =18 044 kJ/kg) were assessed by these analyses. The higher heating value and lower heating value of a dry Salix viminalis bark were also assessed (QSB = 19 389 kJ/kg, and QnB = 17 997 kJ/kg). The share of bark of 19.35%was assessed in wood-chips produced from Salix viminalis - clone ULV, in accordance with the Slovak Technical Norm STN 48 0058 for wood assortments, wood chips containing leaves, and sawdust. The lower heating value of wood chips produced from Salix viminalis - clone ULV in dry state was calculated, based on the lower heating value of salix wood, the lower heating value of salix bark, and the share of bark in wood chips as a weighted average Qn CH = 18 035 kJ/kg.U radu se prikazuju istraživanja energijskih obilježja iverja proizvedenoga od drva Salix viminalis – klona ULV, koje se plantažno uzgaja. Gornja ogrjevna vrijednost drva i kore određena je mjerenjem uz pomoć kalorimetra za čvrsta goriva, model IKA C 200. Donja ogrjevna vrijednost drva i kore izračunana je iz gornje ogrjevne vrijednosti Qs, uzimanjem u obzir sadržaj vodika Hdaf i sadržaja vode koji su određeni na uzorcima u laboratoriju. Provedenim analizama dobivene su gornje i donje ogrjevne vrijednosti suhog drva Salix viminalis – klona ULV (QSW = 19 520 kJ/kg i QnW =18 044 kJ/kg). Također su dobivene i gornja i donja ogrjevna vrijednost kore drva Salix viminalis – klona ULV (QSB = 19 389 kJ/kg, i QnB = 17 997 kJ/kg). Određen je udjel kore u iverju proizvedenome od drva Salix viminalis – klona ULV prema normi STN 48 0058 i iznosi 19,35 %. Donja ogrjevna vrijednost iverja proizvedenoga od drva Salix viminalis – klona ULV u suhom stanju izračunana je na bazi donje ogrjevne vrijednosti drva i donje ogrjevne vrijednosti kore te udjela kore u iverju, a dobivena je vrijednost Qn CH = 18 035 kJ/kg
