Kažimírová V., Opáth R. (2016): Biomass combustion emissions. Res. Agr. Eng., 62 (Special Issue): S61-S65.The paper deals with gaseous emissions generated in biomass combustion in water boilers. It provides results of analyses of gaseous emissions and boiler efficiency in combustion of branches of apple trees from spring pruning, spruce cuttings and corn cobs obtained from kernel harvest. Measurements were done in laboratory conditions. Average CO emission values observed in combustion were from 334.7 to 650.18 mg/m 3 and average NO x emission values were low, between 50.1 and 157.2 mg/m 3 . Boiler efficiency in applewood combustion was lower -this was caused by its higher moisture.

The paper deals with biogas yield production from two co-substrates - sorghum silage mixture of corn silage and crushed potatoes combined with mixture of livestock manure and swine slurry - in a semi-continuous digester under mesophilic conditions. This paper aims to evaluate the suitability of alternative substrates for biogas production under biogas plant operational conditions. In the first experiment, biogas yield was 0.159 Nm3 per hour with methane content of 56.96% vol. In the second experiment, biogas yield was 0.18 Nm3 per hour with methane content of 52.95% vol. Experiments confirmed that both substrates are suitable for biogas production under the given conditions.

Kažimírová V., Brestovi T., Opáth R., 2013. Selected properties of agricultural biomass. Res. Agr. Eng., 59 (Special Issue): S60-S64.Th e presented contribution deals with the quantifi cation of moisture, combustible matter content, ash content and higher heating value of the selected types of biomass used for the heat production by direct combustion. Th e moisture, combustible matter, and ash contents were determined by gravimetric analysis in accordance with the established standards. Th e average moisture of the materials examined varied from 4.35 to 9.17%; the combustible matter content in the original samples ranged from 79.46 to 93.51%; the ash content ranged from 2.14 to 11.28%. Higher heating values of the examined types of biomass varied from 14,996 to 17,641 kJ/kg. Th e main contribution of the thesis is the acquisition of values usable in subsequent theoretical and practical eff orts to increase the effi ciency of the heat production by direct combustion of biomass. Th e results are useable in biomass boiler design and in identifying suitable conditions for combustion, including the service parameters of biomass boilers.Keywords: gravimetry; dry mass; combustible matter; ash; higher heating value Combustion is one of the possible biomass uses, resulting in the production of heat utilisable for the household heating, heating of industrial and agricultural structures, and as processing heat. Th e products of combustion are combustion gases, solid combustion products, and heat.Th e goal of this paper is to determine the proportions of combustible matter and ash in the dry mass and the higher heating value of several materials produced in agriculture and landscape design that could be used as biofuels utilised in energy production by their direct combustion.Th e dry mass of solid fuels consists of ash and combustible matter. Th e energy content of a fuel is not characterised by the content of combustible matter in that fuel because each fuel has a diff erent higher heating value depending on its chemical composition. Th e amount of ash produced by combustion of a certain type of fuel can be estimated by means of the known composition of the dry mass of this fuel. MATERIAL AND METHODSFuel samples that were subjected to analysis (wheat screenings, hay, cane, Japanese knotweed, and poppy screenings) belong to a wide group of the agricultural waste biomass and biomass obtained from the landscape maintenance. Th e other examined sample was wheat not used for feeding purposes.Measuring of moisture and percentages of combustible matter, and ash. A muffl e furnace Nabetherm L9/11 /SW (Nabertherm GmbH, Lilienthal, Germany) ( Fig. 1) with the heating device Vol. 59, 2013 (Special Issue): S60-S64 Res. Agr. Eng.

FODORA MARIÁN, GADUŠ JÁN, MAREČEK JAN, VÍTĚZ TOMÁŠ, KAŽIMÍROVÁ VIERA: Design of laboratory cyclone separator for biogas purifi cation. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 3, pp. 631-635 This article deals with calculation of a cyclone separator for biogas purifi cation using physical and chemical methods.

This paper deals with assessment of density, moisture content and mechanical properties of pellets made of dry swine manure utilizing pellet production line MGL 200. Pellets were subsequently subjected to compressive loading test. Furthermore, the values obtained were measured by means of device Andilog Stentor 1000 and compression diagrams were plotted. In terms of compressive strength, pellet type 1 showed value of 10.47 MPa; pellet type 2 showed value of 6.24 MPa. Considering the elasticity modulus, pellet type 1 showed value of 122.39 MPa; pellet type 2 showed value of 71.12 MPa. Other observed properties included force necessary for 10% compression strain; force in the first maximum of force-strain curve; force in the inflection point of the force-time curve. Results obtained from compressive loading test provide a basis for innovations in pellet production utilizing materials other than wood biomass.