Wyniki wyszukiwania - BazTech

1

Method of choosing optimal composition of biomass mixtures

Katelbach-Woźniak A., Niestrój M., Szlęk A.

Archivum Combustionis

|

2014

|

Vol. 34 nr 1

27—34

EN

Biomass has high content of volatile matter, hence devolatilization process is rapid. Necessity of supplying high fluxes of combustion air is usually one of the factor which leads to high values of air excess ratio and, as a consequence to decrease of energy efficiency. However it is possible to use mixture of different sorts of biomasses and thus obtain fuel which might equalize devolatilization rate. In this paper procedure for choosing optimal mixture of given sorts of biomasses based on their composition is presented. First, pyrolysis process of hemicellulose, cellulose and lignin was conducted using thermobalance. Based on the results and assuming that there are no interactions between pure components, optimal composition of the mixture were calculated. In the next step, according to obtained optimal composition, proportions of oak, pine, rape straw and wheat straw were calculated. Finally, pyrolysis of selected biomass mixtures was carried out. It was found that due to the presence of cellulose, which decomposes in very narrow temperature range, all of mixtures are characterized by the devolatilization with local maximum occurring at the temperature around 350°C.

2

Investigation of biomass mixture devolatilization process

Bibrzycki J., Katelbach-Woźniak A., Niestrój M., Szlęk A.

Archivum Combustionis

|

2013

|

Vol. 33 nr 3

155--167

EN

In this paper, pyrolysis of selected biomass types and their mixtures was investigated using thermogravimetric analyzer (TGA). The purpose of the work was to study interactions between components of biomass mixtures and influence of ash composition on pyrolysis up to 600°C, using two heating rates 1 K/min and 10 K/min. Five different biomass samples were taken into consideration: oak, pine, wheat straw, rape straw and energy crop (willow). It was found, that during slow pyrolysis (1 K/min) the volatiles yield increased and interactions were more noticeable. Results showed that increasing content of some components, like wheat straw, willow, in some biomass mixtures may favor occurrence of interactions. It was also found, that increasing heating rate accelerates devolatilization process and shifts extreme of DTG to higher temperature. Authors attempted to present volatiles yield, in a given temperature range, as a linear function of elemental composition of biomass.

3

Badania procesu rozkładu termicznego podstawowych substancji organicznych biomasy

Bibrzycki J., Katelbach-Woźniak A., Niestrój M., Szlęk A.

Archiwum Spalania

|

2012

|

Vol. 12, nr 1-2

39--45

4

Piroliza mieszanek różnych gatunków słomy

Katelbach-Woźniak A., Szlęk A.

Archiwum Spalania

|

2011

|

Vol. 11, nr 3-4

207-214

PL

W artykule przedstawiono badania termograwimetryczne wpływu mieszania różnych gatunków słomy na ilość wydzielonych części lotnych, maksymalną szybkość uwalniania się części lotnych oraz temperatury charakterystyczne. Proces pirolizy prowadzono w atmosferze azotu do temperatury końcowej 600 st. C z zadaną szybkości grzania l0 K/min. Mieszanki sporządzono w proporcjach 25:75, 50:50, 75:25 oraz dla mieszanek rzepak/żyto i rzepak/pszenica dodatkowo 65:35, 85:15. W oparciu o przeprowadzone badania stwierdzono, że istnieje możliwość wpływania na proces pirolizy za pomocą kontrolowania składu mieszanki.

EN

The paper presents the thermogravimetric study of the effect of mixing different type of biomass on the amount of volatile matter, the derivate of the mass as a function of time (DTG) and the characteristic temperatures. Pyrolysis process was carried out in a nitrogen atmosphere up to the final temperature 600 C with constant heating rate equal to 10 K/min. Main conclusion of this study is that by proper mixing of different biomass types characteristic parameters of the biomass can be influenced in the wide range and that the properties of mixture is no equal to the weighted average of the properties of pure components.