Poiša, Liena

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Poiša, Liena
Official Name
Poiša, Liena
Alternative Name
Poisa, Liena
Liena Poisa
Poisa, L
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Email
liena.poisa@rta.lv
ORCID
Scopus Author ID
55014398000
Researcher ID
HJZ-3782-2023

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  • Publication
    MELTING TEMPERATURE BEHAVIOR OF DIFFERENT ENERGY CROP ASHES
    (2017)
    Skaidrīte Būmane
    ;
    Poiša, Liena 
    ;
    Aleksandrs Adamovičs
    ;
    Rasma Platače
    ;
    Edgars Čubars
    For solid fuels ash melting temperature is recommended to be higher than 1000°C, so that it can be used in automated furnaces; therefore-promising energy crops are investigated as renewable energy source. This paper presents the results of tests on melting temperature of different energy crop ashes.The field trial was carried out in the study farm of the Latvia University of Agriculture "Pēterlauki" (56°53'N, 23°71'E) in the sod calcareous soils characterized by pH KCl 6.7, P 52 mg kg-1, K 128 mg kg-1, organic matter content from 21 to 25 g kg-1 in the soil. Energy crops analysed: reed canary grass (Phalaris arundinacea L.), birch (Betula pendula Roth.), osier (Salix spp.), grey alder (Alnus incana (L.) Moench), poplar (Populus tremula L.), hybrid aspen (Populus tremuloides x Populus tremula). Results indicate that the ash melting temperature (D, St, Ht, Ft) for the wood energy crops were higher than for the studied grass energy crops and their mixture. Ash melting temperature in all phases over 1200°C was observed for such poplar and hybrid aspen mixture proportions: 3 parts of wood and 1 part of reed canary grass, or 1 part of wood and 1 part of reed canary grass.
    Scopus© Citations 3
  • Publication
    ANALYSIS OF ASH CONTENT IN COMPOSITE BIOMASS FUELS
    (2017)
    Edgars Čubars
    ;
    Poiša, Liena 
    The study reveals research of ash content in different composite biomass fuels. It contains analysis of samples obtained from various local Latvian biomass types, i.e. reed, wood, hemp, flax shives and peat, by combining them in different proportions. Ash is a by-product derived from combustion process consisting mostly of inorganic substances that are left after a fuel is burnt. High level of ash content in a fuel is undesirable because it causes problems in automation of biomass combustion process. Previous studies carried out by the author show that average ash content in reeds is 2%, which is a high index comparing with wood where ash content is approximately 0,5-1%. Thus, the high ash content in reeds my cause problems in reed combustion in solid fuel boilers. Besides, it is not possible to ensure permanent reed collection that would ensure continuous reed fuel generating process all year long. In order to reduce the ash content to the optimal level and to diversify raw materials necessary for biomass fuel generating process, the author suggests using composite fuels by combining different biomass types. The study contains optimal combining proportions of different biomass types for composite fuel production basing on the ash content in them.
    Scopus© Citations 8