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Complex effectiveness and emission studies were carried out for heating boilers of low heat output, fired with wood fuel. The studies were completed in a series of stages. The first step was directed at the investigation of properties of currently used biofuel made of biomass and potentially perspective biofuel made of agromass in order to determine specific properties and how fuel should be prepared so that it could be efficiently burned in heating boilers. The second stage included numerical and experimental studies of various combustion chambers of heating boilers and air/flue gas canals in order to improve air/combustion product mixing and assuring proper combustion products' presence time in the hot zone and their temperature. During the last stage, the distribution of the particulate matter concentration in combustion products depending on their size and reduction methods of the concentration were analyzed. [ABSTRACT FROM AUTHOR]

The multichannel two-level cyclone has been designed for separating solid particles from airflow and built at the Laboratory of Environmental Protection Technologies of Vilnius Gediminas Technical University. The conducted research is aimed at determining air flow distribution at two levels and channels of the multichannel cyclone. The multifunctional meter Testo-400 and the dynamic Pitot tube have been used form easuring air flow rates in the channels. The obtained results show that the equal volume of air gets into two levels installed inside the cyclone, and rates are distributed equally in the channels of these levels. The maximum air flow rate is recorded in the first channel and occurs when half-rings are set in such positions so that 75% of air flow returns to the previous channel. The biggest aerodynamic resistance is 1660 Pa and has been recorded in the cyclone having eight channels under air flow distribution ratio 75/25. The highest air purification efficiency has been observed in the two-level six-channel cyclone under air flow distribution ratio 75/25. The effectiveness of separating granite particles is 92.1% and that of wood particles - 91.1 when the particles are up to 20 pm in diameter. [ABSTRACT FROM AUTHOR]

The conducted investigation is aimed at providing information on air flow parameters in the cylindrical and spiral shell (de-vices are designed for separating solid particles from air flow having tangent flow inlet). Experimental research has employed multi-cyclones created by the Department of Environmental Protection at Vilnius Gediminas Technical University. The study is focused on investigating and comparing the distribution of the dynamic pressure of the airflow in six-channel cyclones inside the structures of devices. The paper establishes and estimates the efficiency of air cleaning changing air phase parameters using different particulate matters. The efficiency of the cyclone has been defined applying the weighted method based on LAND 28-98/M-08 methodology. The article presents the results of experimental research on the air cleaning efficiency of cylindrical and spiral shells using 20 µm glass and clay particulate matter under the initial concentration that may vary from 500 mg/m³ to 15 g/m³ using semi-rings with windows at different positions. The obtained results has shown that the maximum efficiency of the cylindrical shell increases up to 87,3 % while the initial concentration of glass makes 15 g/m³. [ABSTRACT FROM AUTHOR]