Technical gazette, Vol. 22 No. 3, 2015.
Original scientific paper
https://doi.org/10.17559/TV-20150126195958
The influence of biomass quality on the stability and sustainability of district heating systems of low-accumulation objects
Ante Čikić
; Technical College in Bjelovar, Trg Eugena Kvaternika 4, 43 000 Bjelovar, Croatia
Vinko Višnjić
; University North, University Centre of Varaždin, 104. brigade 4, 42 000 Varaždin, Croatia
Marko Dunđer
; Faculty of Philosophy, University of Rijeka, Department of Polytechnic, Omladinska 14, 51 000 Rijeka, Croatia
Abstract
Research was conducted during the incineration of six different biomass groups, whereat each group was observed for three cases of average initial moisture level for the purpose of quantifying the values of impact parameters and contribution to the correlation between biomass quality and the efficiency of a thermal power system. A hot water plant with the power to heat ratio amounting to Q = 600 kW was used, which included a district heating system of a low-accumulation object with a low thermophysical constant and a low time constant. Research was conducted in 18 equal cycles at low outside air temperatures and a maximum need for useful thermal energy. Quantified values showed the consumption of all groups of all average moisture levels of biomass. By analysing the examined temperature of a heating medium and flue gases during the combustion of each biomass group, a direct influence of its quality and average moisture on the sustainability and stability of the district heating system was shown. The most favourable biomass was proposed. Direct application of research results contributes to correct determination of the type, composition and average moisture of biomass, as well as a higher efficiency of the whole thermal power system.
Keywords
biomass quality; district heating system; flue gases; heating medium; heating stability and sustainability; low-accumulation object; thermal power plant
Hrčak ID:
139759
URI
Publication date:
15.6.2015.
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